+++ /dev/null
-/*
- * Faraday FUSBH200 EHCI-like driver
- *
- * Copyright (c) 2013 Faraday Technology Corporation
- *
- * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
- * Feng-Hsin Chiang <john453@faraday-tech.com>
- * Po-Yu Chuang <ratbert.chuang@gmail.com>
- *
- * Most of code borrowed from the Linux-3.7 EHCI driver
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/dmapool.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/ioport.h>
-#include <linux/sched.h>
-#include <linux/vmalloc.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/hrtimer.h>
-#include <linux/list.h>
-#include <linux/interrupt.h>
-#include <linux/usb.h>
-#include <linux/usb/hcd.h>
-#include <linux/moduleparam.h>
-#include <linux/dma-mapping.h>
-#include <linux/debugfs.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <linux/platform_device.h>
-
-#include <asm/byteorder.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/unaligned.h>
-
-/*-------------------------------------------------------------------------*/
-#define DRIVER_AUTHOR "Yuan-Hsin Chen"
-#define DRIVER_DESC "FUSBH200 Host Controller (EHCI) Driver"
-
-static const char hcd_name [] = "fusbh200_hcd";
-
-#undef FUSBH200_URB_TRACE
-
-/* magic numbers that can affect system performance */
-#define FUSBH200_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
-#define FUSBH200_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
-#define FUSBH200_TUNE_RL_TT 0
-#define FUSBH200_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
-#define FUSBH200_TUNE_MULT_TT 1
-/*
- * Some drivers think it's safe to schedule isochronous transfers more than
- * 256 ms into the future (partly as a result of an old bug in the scheduling
- * code). In an attempt to avoid trouble, we will use a minimum scheduling
- * length of 512 frames instead of 256.
- */
-#define FUSBH200_TUNE_FLS 1 /* (medium) 512-frame schedule */
-
-/* Initial IRQ latency: faster than hw default */
-static int log2_irq_thresh = 0; // 0 to 6
-module_param (log2_irq_thresh, int, S_IRUGO);
-MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
-
-/* initial park setting: slower than hw default */
-static unsigned park = 0;
-module_param (park, uint, S_IRUGO);
-MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
-
-/* for link power management(LPM) feature */
-static unsigned int hird;
-module_param(hird, int, S_IRUGO);
-MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
-
-#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
-
-#include "fusbh200.h"
-
-/*-------------------------------------------------------------------------*/
-
-#define fusbh200_dbg(fusbh200, fmt, args...) \
- dev_dbg (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
-#define fusbh200_err(fusbh200, fmt, args...) \
- dev_err (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
-#define fusbh200_info(fusbh200, fmt, args...) \
- dev_info (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
-#define fusbh200_warn(fusbh200, fmt, args...) \
- dev_warn (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
-
-/* check the values in the HCSPARAMS register
- * (host controller _Structural_ parameters)
- * see EHCI spec, Table 2-4 for each value
- */
-static void dbg_hcs_params (struct fusbh200_hcd *fusbh200, char *label)
-{
- u32 params = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
-
- fusbh200_dbg (fusbh200,
- "%s hcs_params 0x%x ports=%d\n",
- label, params,
- HCS_N_PORTS (params)
- );
-}
-
-/* check the values in the HCCPARAMS register
- * (host controller _Capability_ parameters)
- * see EHCI Spec, Table 2-5 for each value
- * */
-static void dbg_hcc_params (struct fusbh200_hcd *fusbh200, char *label)
-{
- u32 params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
-
- fusbh200_dbg (fusbh200,
- "%s hcc_params %04x uframes %s%s\n",
- label,
- params,
- HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
- HCC_CANPARK(params) ? " park" : "");
-}
-
-static void __maybe_unused
-dbg_qtd (const char *label, struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd)
-{
- fusbh200_dbg(fusbh200, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
- hc32_to_cpup(fusbh200, &qtd->hw_next),
- hc32_to_cpup(fusbh200, &qtd->hw_alt_next),
- hc32_to_cpup(fusbh200, &qtd->hw_token),
- hc32_to_cpup(fusbh200, &qtd->hw_buf [0]));
- if (qtd->hw_buf [1])
- fusbh200_dbg(fusbh200, " p1=%08x p2=%08x p3=%08x p4=%08x\n",
- hc32_to_cpup(fusbh200, &qtd->hw_buf[1]),
- hc32_to_cpup(fusbh200, &qtd->hw_buf[2]),
- hc32_to_cpup(fusbh200, &qtd->hw_buf[3]),
- hc32_to_cpup(fusbh200, &qtd->hw_buf[4]));
-}
-
-static void __maybe_unused
-dbg_qh (const char *label, struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- struct fusbh200_qh_hw *hw = qh->hw;
-
- fusbh200_dbg (fusbh200, "%s qh %p n%08x info %x %x qtd %x\n", label,
- qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
- dbg_qtd("overlay", fusbh200, (struct fusbh200_qtd *) &hw->hw_qtd_next);
-}
-
-static void __maybe_unused
-dbg_itd (const char *label, struct fusbh200_hcd *fusbh200, struct fusbh200_itd *itd)
-{
- fusbh200_dbg (fusbh200, "%s [%d] itd %p, next %08x, urb %p\n",
- label, itd->frame, itd, hc32_to_cpu(fusbh200, itd->hw_next),
- itd->urb);
- fusbh200_dbg (fusbh200,
- " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
- hc32_to_cpu(fusbh200, itd->hw_transaction[0]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[1]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[2]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[3]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[4]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[5]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[6]),
- hc32_to_cpu(fusbh200, itd->hw_transaction[7]));
- fusbh200_dbg (fusbh200,
- " buf: %08x %08x %08x %08x %08x %08x %08x\n",
- hc32_to_cpu(fusbh200, itd->hw_bufp[0]),
- hc32_to_cpu(fusbh200, itd->hw_bufp[1]),
- hc32_to_cpu(fusbh200, itd->hw_bufp[2]),
- hc32_to_cpu(fusbh200, itd->hw_bufp[3]),
- hc32_to_cpu(fusbh200, itd->hw_bufp[4]),
- hc32_to_cpu(fusbh200, itd->hw_bufp[5]),
- hc32_to_cpu(fusbh200, itd->hw_bufp[6]));
- fusbh200_dbg (fusbh200, " index: %d %d %d %d %d %d %d %d\n",
- itd->index[0], itd->index[1], itd->index[2],
- itd->index[3], itd->index[4], itd->index[5],
- itd->index[6], itd->index[7]);
-}
-
-static int __maybe_unused
-dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
-{
- return scnprintf (buf, len,
- "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
- label, label [0] ? " " : "", status,
- (status & STS_ASS) ? " Async" : "",
- (status & STS_PSS) ? " Periodic" : "",
- (status & STS_RECL) ? " Recl" : "",
- (status & STS_HALT) ? " Halt" : "",
- (status & STS_IAA) ? " IAA" : "",
- (status & STS_FATAL) ? " FATAL" : "",
- (status & STS_FLR) ? " FLR" : "",
- (status & STS_PCD) ? " PCD" : "",
- (status & STS_ERR) ? " ERR" : "",
- (status & STS_INT) ? " INT" : ""
- );
-}
-
-static int __maybe_unused
-dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
-{
- return scnprintf (buf, len,
- "%s%sintrenable %02x%s%s%s%s%s%s",
- label, label [0] ? " " : "", enable,
- (enable & STS_IAA) ? " IAA" : "",
- (enable & STS_FATAL) ? " FATAL" : "",
- (enable & STS_FLR) ? " FLR" : "",
- (enable & STS_PCD) ? " PCD" : "",
- (enable & STS_ERR) ? " ERR" : "",
- (enable & STS_INT) ? " INT" : ""
- );
-}
-
-static const char *const fls_strings [] =
- { "1024", "512", "256", "??" };
-
-static int
-dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
-{
- return scnprintf (buf, len,
- "%s%scommand %07x %s=%d ithresh=%d%s%s%s "
- "period=%s%s %s",
- label, label [0] ? " " : "", command,
- (command & CMD_PARK) ? " park" : "(park)",
- CMD_PARK_CNT (command),
- (command >> 16) & 0x3f,
- (command & CMD_IAAD) ? " IAAD" : "",
- (command & CMD_ASE) ? " Async" : "",
- (command & CMD_PSE) ? " Periodic" : "",
- fls_strings [(command >> 2) & 0x3],
- (command & CMD_RESET) ? " Reset" : "",
- (command & CMD_RUN) ? "RUN" : "HALT"
- );
-}
-
-static int
-dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
-{
- char *sig;
-
- /* signaling state */
- switch (status & (3 << 10)) {
- case 0 << 10: sig = "se0"; break;
- case 1 << 10: sig = "k"; break; /* low speed */
- case 2 << 10: sig = "j"; break;
- default: sig = "?"; break;
- }
-
- return scnprintf (buf, len,
- "%s%sport:%d status %06x %d "
- "sig=%s%s%s%s%s%s%s%s",
- label, label [0] ? " " : "", port, status,
- status>>25,/*device address */
- sig,
- (status & PORT_RESET) ? " RESET" : "",
- (status & PORT_SUSPEND) ? " SUSPEND" : "",
- (status & PORT_RESUME) ? " RESUME" : "",
- (status & PORT_PEC) ? " PEC" : "",
- (status & PORT_PE) ? " PE" : "",
- (status & PORT_CSC) ? " CSC" : "",
- (status & PORT_CONNECT) ? " CONNECT" : "");
-}
-
-/* functions have the "wrong" filename when they're output... */
-#define dbg_status(fusbh200, label, status) { \
- char _buf [80]; \
- dbg_status_buf (_buf, sizeof _buf, label, status); \
- fusbh200_dbg (fusbh200, "%s\n", _buf); \
-}
-
-#define dbg_cmd(fusbh200, label, command) { \
- char _buf [80]; \
- dbg_command_buf (_buf, sizeof _buf, label, command); \
- fusbh200_dbg (fusbh200, "%s\n", _buf); \
-}
-
-#define dbg_port(fusbh200, label, port, status) { \
- char _buf [80]; \
- dbg_port_buf (_buf, sizeof _buf, label, port, status); \
- fusbh200_dbg (fusbh200, "%s\n", _buf); \
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* troubleshooting help: expose state in debugfs */
-
-static int debug_async_open(struct inode *, struct file *);
-static int debug_periodic_open(struct inode *, struct file *);
-static int debug_registers_open(struct inode *, struct file *);
-static int debug_async_open(struct inode *, struct file *);
-
-static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
-static int debug_close(struct inode *, struct file *);
-
-static const struct file_operations debug_async_fops = {
- .owner = THIS_MODULE,
- .open = debug_async_open,
- .read = debug_output,
- .release = debug_close,
- .llseek = default_llseek,
-};
-static const struct file_operations debug_periodic_fops = {
- .owner = THIS_MODULE,
- .open = debug_periodic_open,
- .read = debug_output,
- .release = debug_close,
- .llseek = default_llseek,
-};
-static const struct file_operations debug_registers_fops = {
- .owner = THIS_MODULE,
- .open = debug_registers_open,
- .read = debug_output,
- .release = debug_close,
- .llseek = default_llseek,
-};
-
-static struct dentry *fusbh200_debug_root;
-
-struct debug_buffer {
- ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
- struct usb_bus *bus;
- struct mutex mutex; /* protect filling of buffer */
- size_t count; /* number of characters filled into buffer */
- char *output_buf;
- size_t alloc_size;
-};
-
-#define speed_char(info1) ({ char tmp; \
- switch (info1 & (3 << 12)) { \
- case QH_FULL_SPEED: tmp = 'f'; break; \
- case QH_LOW_SPEED: tmp = 'l'; break; \
- case QH_HIGH_SPEED: tmp = 'h'; break; \
- default: tmp = '?'; break; \
- } tmp; })
-
-static inline char token_mark(struct fusbh200_hcd *fusbh200, __hc32 token)
-{
- __u32 v = hc32_to_cpu(fusbh200, token);
-
- if (v & QTD_STS_ACTIVE)
- return '*';
- if (v & QTD_STS_HALT)
- return '-';
- if (!IS_SHORT_READ (v))
- return ' ';
- /* tries to advance through hw_alt_next */
- return '/';
-}
-
-static void qh_lines (
- struct fusbh200_hcd *fusbh200,
- struct fusbh200_qh *qh,
- char **nextp,
- unsigned *sizep
-)
-{
- u32 scratch;
- u32 hw_curr;
- struct fusbh200_qtd *td;
- unsigned temp;
- unsigned size = *sizep;
- char *next = *nextp;
- char mark;
- __le32 list_end = FUSBH200_LIST_END(fusbh200);
- struct fusbh200_qh_hw *hw = qh->hw;
-
- if (hw->hw_qtd_next == list_end) /* NEC does this */
- mark = '@';
- else
- mark = token_mark(fusbh200, hw->hw_token);
- if (mark == '/') { /* qh_alt_next controls qh advance? */
- if ((hw->hw_alt_next & QTD_MASK(fusbh200))
- == fusbh200->async->hw->hw_alt_next)
- mark = '#'; /* blocked */
- else if (hw->hw_alt_next == list_end)
- mark = '.'; /* use hw_qtd_next */
- /* else alt_next points to some other qtd */
- }
- scratch = hc32_to_cpup(fusbh200, &hw->hw_info1);
- hw_curr = (mark == '*') ? hc32_to_cpup(fusbh200, &hw->hw_current) : 0;
- temp = scnprintf (next, size,
- "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
- qh, scratch & 0x007f,
- speed_char (scratch),
- (scratch >> 8) & 0x000f,
- scratch, hc32_to_cpup(fusbh200, &hw->hw_info2),
- hc32_to_cpup(fusbh200, &hw->hw_token), mark,
- (cpu_to_hc32(fusbh200, QTD_TOGGLE) & hw->hw_token)
- ? "data1" : "data0",
- (hc32_to_cpup(fusbh200, &hw->hw_alt_next) >> 1) & 0x0f);
- size -= temp;
- next += temp;
-
- /* hc may be modifying the list as we read it ... */
- list_for_each_entry(td, &qh->qtd_list, qtd_list) {
- scratch = hc32_to_cpup(fusbh200, &td->hw_token);
- mark = ' ';
- if (hw_curr == td->qtd_dma)
- mark = '*';
- else if (hw->hw_qtd_next == cpu_to_hc32(fusbh200, td->qtd_dma))
- mark = '+';
- else if (QTD_LENGTH (scratch)) {
- if (td->hw_alt_next == fusbh200->async->hw->hw_alt_next)
- mark = '#';
- else if (td->hw_alt_next != list_end)
- mark = '/';
- }
- temp = snprintf (next, size,
- "\n\t%p%c%s len=%d %08x urb %p",
- td, mark, ({ char *tmp;
- switch ((scratch>>8)&0x03) {
- case 0: tmp = "out"; break;
- case 1: tmp = "in"; break;
- case 2: tmp = "setup"; break;
- default: tmp = "?"; break;
- } tmp;}),
- (scratch >> 16) & 0x7fff,
- scratch,
- td->urb);
- if (size < temp)
- temp = size;
- size -= temp;
- next += temp;
- if (temp == size)
- goto done;
- }
-
- temp = snprintf (next, size, "\n");
- if (size < temp)
- temp = size;
- size -= temp;
- next += temp;
-
-done:
- *sizep = size;
- *nextp = next;
-}
-
-static ssize_t fill_async_buffer(struct debug_buffer *buf)
-{
- struct usb_hcd *hcd;
- struct fusbh200_hcd *fusbh200;
- unsigned long flags;
- unsigned temp, size;
- char *next;
- struct fusbh200_qh *qh;
-
- hcd = bus_to_hcd(buf->bus);
- fusbh200 = hcd_to_fusbh200 (hcd);
- next = buf->output_buf;
- size = buf->alloc_size;
-
- *next = 0;
-
- /* dumps a snapshot of the async schedule.
- * usually empty except for long-term bulk reads, or head.
- * one QH per line, and TDs we know about
- */
- spin_lock_irqsave (&fusbh200->lock, flags);
- for (qh = fusbh200->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
- qh_lines (fusbh200, qh, &next, &size);
- if (fusbh200->async_unlink && size > 0) {
- temp = scnprintf(next, size, "\nunlink =\n");
- size -= temp;
- next += temp;
-
- for (qh = fusbh200->async_unlink; size > 0 && qh;
- qh = qh->unlink_next)
- qh_lines (fusbh200, qh, &next, &size);
- }
- spin_unlock_irqrestore (&fusbh200->lock, flags);
-
- return strlen(buf->output_buf);
-}
-
-#define DBG_SCHED_LIMIT 64
-static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
-{
- struct usb_hcd *hcd;
- struct fusbh200_hcd *fusbh200;
- unsigned long flags;
- union fusbh200_shadow p, *seen;
- unsigned temp, size, seen_count;
- char *next;
- unsigned i;
- __hc32 tag;
-
- seen = kmalloc(DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC);
- if (!seen)
- return 0;
- seen_count = 0;
-
- hcd = bus_to_hcd(buf->bus);
- fusbh200 = hcd_to_fusbh200 (hcd);
- next = buf->output_buf;
- size = buf->alloc_size;
-
- temp = scnprintf (next, size, "size = %d\n", fusbh200->periodic_size);
- size -= temp;
- next += temp;
-
- /* dump a snapshot of the periodic schedule.
- * iso changes, interrupt usually doesn't.
- */
- spin_lock_irqsave (&fusbh200->lock, flags);
- for (i = 0; i < fusbh200->periodic_size; i++) {
- p = fusbh200->pshadow [i];
- if (likely (!p.ptr))
- continue;
- tag = Q_NEXT_TYPE(fusbh200, fusbh200->periodic [i]);
-
- temp = scnprintf (next, size, "%4d: ", i);
- size -= temp;
- next += temp;
-
- do {
- struct fusbh200_qh_hw *hw;
-
- switch (hc32_to_cpu(fusbh200, tag)) {
- case Q_TYPE_QH:
- hw = p.qh->hw;
- temp = scnprintf (next, size, " qh%d-%04x/%p",
- p.qh->period,
- hc32_to_cpup(fusbh200,
- &hw->hw_info2)
- /* uframe masks */
- & (QH_CMASK | QH_SMASK),
- p.qh);
- size -= temp;
- next += temp;
- /* don't repeat what follows this qh */
- for (temp = 0; temp < seen_count; temp++) {
- if (seen [temp].ptr != p.ptr)
- continue;
- if (p.qh->qh_next.ptr) {
- temp = scnprintf (next, size,
- " ...");
- size -= temp;
- next += temp;
- }
- break;
- }
- /* show more info the first time around */
- if (temp == seen_count) {
- u32 scratch = hc32_to_cpup(fusbh200,
- &hw->hw_info1);
- struct fusbh200_qtd *qtd;
- char *type = "";
-
- /* count tds, get ep direction */
- temp = 0;
- list_for_each_entry (qtd,
- &p.qh->qtd_list,
- qtd_list) {
- temp++;
- switch (0x03 & (hc32_to_cpu(
- fusbh200,
- qtd->hw_token) >> 8)) {
- case 0: type = "out"; continue;
- case 1: type = "in"; continue;
- }
- }
-
- temp = scnprintf (next, size,
- " (%c%d ep%d%s "
- "[%d/%d] q%d p%d)",
- speed_char (scratch),
- scratch & 0x007f,
- (scratch >> 8) & 0x000f, type,
- p.qh->usecs, p.qh->c_usecs,
- temp,
- 0x7ff & (scratch >> 16));
-
- if (seen_count < DBG_SCHED_LIMIT)
- seen [seen_count++].qh = p.qh;
- } else
- temp = 0;
- tag = Q_NEXT_TYPE(fusbh200, hw->hw_next);
- p = p.qh->qh_next;
- break;
- case Q_TYPE_FSTN:
- temp = scnprintf (next, size,
- " fstn-%8x/%p", p.fstn->hw_prev,
- p.fstn);
- tag = Q_NEXT_TYPE(fusbh200, p.fstn->hw_next);
- p = p.fstn->fstn_next;
- break;
- case Q_TYPE_ITD:
- temp = scnprintf (next, size,
- " itd/%p", p.itd);
- tag = Q_NEXT_TYPE(fusbh200, p.itd->hw_next);
- p = p.itd->itd_next;
- break;
- }
- size -= temp;
- next += temp;
- } while (p.ptr);
-
- temp = scnprintf (next, size, "\n");
- size -= temp;
- next += temp;
- }
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- kfree (seen);
-
- return buf->alloc_size - size;
-}
-#undef DBG_SCHED_LIMIT
-
-static const char *rh_state_string(struct fusbh200_hcd *fusbh200)
-{
- switch (fusbh200->rh_state) {
- case FUSBH200_RH_HALTED:
- return "halted";
- case FUSBH200_RH_SUSPENDED:
- return "suspended";
- case FUSBH200_RH_RUNNING:
- return "running";
- case FUSBH200_RH_STOPPING:
- return "stopping";
- }
- return "?";
-}
-
-static ssize_t fill_registers_buffer(struct debug_buffer *buf)
-{
- struct usb_hcd *hcd;
- struct fusbh200_hcd *fusbh200;
- unsigned long flags;
- unsigned temp, size, i;
- char *next, scratch [80];
- static char fmt [] = "%*s\n";
- static char label [] = "";
-
- hcd = bus_to_hcd(buf->bus);
- fusbh200 = hcd_to_fusbh200 (hcd);
- next = buf->output_buf;
- size = buf->alloc_size;
-
- spin_lock_irqsave (&fusbh200->lock, flags);
-
- if (!HCD_HW_ACCESSIBLE(hcd)) {
- size = scnprintf (next, size,
- "bus %s, device %s\n"
- "%s\n"
- "SUSPENDED (no register access)\n",
- hcd->self.controller->bus->name,
- dev_name(hcd->self.controller),
- hcd->product_desc);
- goto done;
- }
-
- /* Capability Registers */
- i = HC_VERSION(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
- temp = scnprintf (next, size,
- "bus %s, device %s\n"
- "%s\n"
- "EHCI %x.%02x, rh state %s\n",
- hcd->self.controller->bus->name,
- dev_name(hcd->self.controller),
- hcd->product_desc,
- i >> 8, i & 0x0ff, rh_state_string(fusbh200));
- size -= temp;
- next += temp;
-
- // FIXME interpret both types of params
- i = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
- temp = scnprintf (next, size, "structural params 0x%08x\n", i);
- size -= temp;
- next += temp;
-
- i = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
- temp = scnprintf (next, size, "capability params 0x%08x\n", i);
- size -= temp;
- next += temp;
-
- /* Operational Registers */
- temp = dbg_status_buf (scratch, sizeof scratch, label,
- fusbh200_readl(fusbh200, &fusbh200->regs->status));
- temp = scnprintf (next, size, fmt, temp, scratch);
- size -= temp;
- next += temp;
-
- temp = dbg_command_buf (scratch, sizeof scratch, label,
- fusbh200_readl(fusbh200, &fusbh200->regs->command));
- temp = scnprintf (next, size, fmt, temp, scratch);
- size -= temp;
- next += temp;
-
- temp = dbg_intr_buf (scratch, sizeof scratch, label,
- fusbh200_readl(fusbh200, &fusbh200->regs->intr_enable));
- temp = scnprintf (next, size, fmt, temp, scratch);
- size -= temp;
- next += temp;
-
- temp = scnprintf (next, size, "uframe %04x\n",
- fusbh200_read_frame_index(fusbh200));
- size -= temp;
- next += temp;
-
- if (fusbh200->async_unlink) {
- temp = scnprintf(next, size, "async unlink qh %p\n",
- fusbh200->async_unlink);
- size -= temp;
- next += temp;
- }
-
- temp = scnprintf (next, size,
- "irq normal %ld err %ld iaa %ld (lost %ld)\n",
- fusbh200->stats.normal, fusbh200->stats.error, fusbh200->stats.iaa,
- fusbh200->stats.lost_iaa);
- size -= temp;
- next += temp;
-
- temp = scnprintf (next, size, "complete %ld unlink %ld\n",
- fusbh200->stats.complete, fusbh200->stats.unlink);
- size -= temp;
- next += temp;
-
-done:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
-
- return buf->alloc_size - size;
-}
-
-static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
- ssize_t (*fill_func)(struct debug_buffer *))
-{
- struct debug_buffer *buf;
-
- buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
-
- if (buf) {
- buf->bus = bus;
- buf->fill_func = fill_func;
- mutex_init(&buf->mutex);
- buf->alloc_size = PAGE_SIZE;
- }
-
- return buf;
-}
-
-static int fill_buffer(struct debug_buffer *buf)
-{
- int ret = 0;
-
- if (!buf->output_buf)
- buf->output_buf = vmalloc(buf->alloc_size);
-
- if (!buf->output_buf) {
- ret = -ENOMEM;
- goto out;
- }
-
- ret = buf->fill_func(buf);
-
- if (ret >= 0) {
- buf->count = ret;
- ret = 0;
- }
-
-out:
- return ret;
-}
-
-static ssize_t debug_output(struct file *file, char __user *user_buf,
- size_t len, loff_t *offset)
-{
- struct debug_buffer *buf = file->private_data;
- int ret = 0;
-
- mutex_lock(&buf->mutex);
- if (buf->count == 0) {
- ret = fill_buffer(buf);
- if (ret != 0) {
- mutex_unlock(&buf->mutex);
- goto out;
- }
- }
- mutex_unlock(&buf->mutex);
-
- ret = simple_read_from_buffer(user_buf, len, offset,
- buf->output_buf, buf->count);
-
-out:
- return ret;
-
-}
-
-static int debug_close(struct inode *inode, struct file *file)
-{
- struct debug_buffer *buf = file->private_data;
-
- if (buf) {
- vfree(buf->output_buf);
- kfree(buf);
- }
-
- return 0;
-}
-static int debug_async_open(struct inode *inode, struct file *file)
-{
- file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
-
- return file->private_data ? 0 : -ENOMEM;
-}
-
-static int debug_periodic_open(struct inode *inode, struct file *file)
-{
- struct debug_buffer *buf;
- buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
- if (!buf)
- return -ENOMEM;
-
- buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
- file->private_data = buf;
- return 0;
-}
-
-static int debug_registers_open(struct inode *inode, struct file *file)
-{
- file->private_data = alloc_buffer(inode->i_private,
- fill_registers_buffer);
-
- return file->private_data ? 0 : -ENOMEM;
-}
-
-static inline void create_debug_files (struct fusbh200_hcd *fusbh200)
-{
- struct usb_bus *bus = &fusbh200_to_hcd(fusbh200)->self;
-
- fusbh200->debug_dir = debugfs_create_dir(bus->bus_name, fusbh200_debug_root);
- if (!fusbh200->debug_dir)
- return;
-
- if (!debugfs_create_file("async", S_IRUGO, fusbh200->debug_dir, bus,
- &debug_async_fops))
- goto file_error;
-
- if (!debugfs_create_file("periodic", S_IRUGO, fusbh200->debug_dir, bus,
- &debug_periodic_fops))
- goto file_error;
-
- if (!debugfs_create_file("registers", S_IRUGO, fusbh200->debug_dir, bus,
- &debug_registers_fops))
- goto file_error;
-
- return;
-
-file_error:
- debugfs_remove_recursive(fusbh200->debug_dir);
-}
-
-static inline void remove_debug_files (struct fusbh200_hcd *fusbh200)
-{
- debugfs_remove_recursive(fusbh200->debug_dir);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * handshake - spin reading hc until handshake completes or fails
- * @ptr: address of hc register to be read
- * @mask: bits to look at in result of read
- * @done: value of those bits when handshake succeeds
- * @usec: timeout in microseconds
- *
- * Returns negative errno, or zero on success
- *
- * Success happens when the "mask" bits have the specified value (hardware
- * handshake done). There are two failure modes: "usec" have passed (major
- * hardware flakeout), or the register reads as all-ones (hardware removed).
- *
- * That last failure should_only happen in cases like physical cardbus eject
- * before driver shutdown. But it also seems to be caused by bugs in cardbus
- * bridge shutdown: shutting down the bridge before the devices using it.
- */
-static int handshake (struct fusbh200_hcd *fusbh200, void __iomem *ptr,
- u32 mask, u32 done, int usec)
-{
- u32 result;
-
- do {
- result = fusbh200_readl(fusbh200, ptr);
- if (result == ~(u32)0) /* card removed */
- return -ENODEV;
- result &= mask;
- if (result == done)
- return 0;
- udelay (1);
- usec--;
- } while (usec > 0);
- return -ETIMEDOUT;
-}
-
-/*
- * Force HC to halt state from unknown (EHCI spec section 2.3).
- * Must be called with interrupts enabled and the lock not held.
- */
-static int fusbh200_halt (struct fusbh200_hcd *fusbh200)
-{
- u32 temp;
-
- spin_lock_irq(&fusbh200->lock);
-
- /* disable any irqs left enabled by previous code */
- fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
-
- /*
- * This routine gets called during probe before fusbh200->command
- * has been initialized, so we can't rely on its value.
- */
- fusbh200->command &= ~CMD_RUN;
- temp = fusbh200_readl(fusbh200, &fusbh200->regs->command);
- temp &= ~(CMD_RUN | CMD_IAAD);
- fusbh200_writel(fusbh200, temp, &fusbh200->regs->command);
-
- spin_unlock_irq(&fusbh200->lock);
- synchronize_irq(fusbh200_to_hcd(fusbh200)->irq);
-
- return handshake(fusbh200, &fusbh200->regs->status,
- STS_HALT, STS_HALT, 16 * 125);
-}
-
-/*
- * Reset a non-running (STS_HALT == 1) controller.
- * Must be called with interrupts enabled and the lock not held.
- */
-static int fusbh200_reset (struct fusbh200_hcd *fusbh200)
-{
- int retval;
- u32 command = fusbh200_readl(fusbh200, &fusbh200->regs->command);
-
- /* If the EHCI debug controller is active, special care must be
- * taken before and after a host controller reset */
- if (fusbh200->debug && !dbgp_reset_prep(fusbh200_to_hcd(fusbh200)))
- fusbh200->debug = NULL;
-
- command |= CMD_RESET;
- dbg_cmd (fusbh200, "reset", command);
- fusbh200_writel(fusbh200, command, &fusbh200->regs->command);
- fusbh200->rh_state = FUSBH200_RH_HALTED;
- fusbh200->next_statechange = jiffies;
- retval = handshake (fusbh200, &fusbh200->regs->command,
- CMD_RESET, 0, 250 * 1000);
-
- if (retval)
- return retval;
-
- if (fusbh200->debug)
- dbgp_external_startup(fusbh200_to_hcd(fusbh200));
-
- fusbh200->port_c_suspend = fusbh200->suspended_ports =
- fusbh200->resuming_ports = 0;
- return retval;
-}
-
-/*
- * Idle the controller (turn off the schedules).
- * Must be called with interrupts enabled and the lock not held.
- */
-static void fusbh200_quiesce (struct fusbh200_hcd *fusbh200)
-{
- u32 temp;
-
- if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
- return;
-
- /* wait for any schedule enables/disables to take effect */
- temp = (fusbh200->command << 10) & (STS_ASS | STS_PSS);
- handshake(fusbh200, &fusbh200->regs->status, STS_ASS | STS_PSS, temp, 16 * 125);
-
- /* then disable anything that's still active */
- spin_lock_irq(&fusbh200->lock);
- fusbh200->command &= ~(CMD_ASE | CMD_PSE);
- fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
- spin_unlock_irq(&fusbh200->lock);
-
- /* hardware can take 16 microframes to turn off ... */
- handshake(fusbh200, &fusbh200->regs->status, STS_ASS | STS_PSS, 0, 16 * 125);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void end_unlink_async(struct fusbh200_hcd *fusbh200);
-static void unlink_empty_async(struct fusbh200_hcd *fusbh200);
-static void fusbh200_work(struct fusbh200_hcd *fusbh200);
-static void start_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
-static void end_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
-
-/*-------------------------------------------------------------------------*/
-
-/* Set a bit in the USBCMD register */
-static void fusbh200_set_command_bit(struct fusbh200_hcd *fusbh200, u32 bit)
-{
- fusbh200->command |= bit;
- fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
-
- /* unblock posted write */
- fusbh200_readl(fusbh200, &fusbh200->regs->command);
-}
-
-/* Clear a bit in the USBCMD register */
-static void fusbh200_clear_command_bit(struct fusbh200_hcd *fusbh200, u32 bit)
-{
- fusbh200->command &= ~bit;
- fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
-
- /* unblock posted write */
- fusbh200_readl(fusbh200, &fusbh200->regs->command);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * EHCI timer support... Now using hrtimers.
- *
- * Lots of different events are triggered from fusbh200->hrtimer. Whenever
- * the timer routine runs, it checks each possible event; events that are
- * currently enabled and whose expiration time has passed get handled.
- * The set of enabled events is stored as a collection of bitflags in
- * fusbh200->enabled_hrtimer_events, and they are numbered in order of
- * increasing delay values (ranging between 1 ms and 100 ms).
- *
- * Rather than implementing a sorted list or tree of all pending events,
- * we keep track only of the lowest-numbered pending event, in
- * fusbh200->next_hrtimer_event. Whenever fusbh200->hrtimer gets restarted, its
- * expiration time is set to the timeout value for this event.
- *
- * As a result, events might not get handled right away; the actual delay
- * could be anywhere up to twice the requested delay. This doesn't
- * matter, because none of the events are especially time-critical. The
- * ones that matter most all have a delay of 1 ms, so they will be
- * handled after 2 ms at most, which is okay. In addition to this, we
- * allow for an expiration range of 1 ms.
- */
-
-/*
- * Delay lengths for the hrtimer event types.
- * Keep this list sorted by delay length, in the same order as
- * the event types indexed by enum fusbh200_hrtimer_event in fusbh200.h.
- */
-static unsigned event_delays_ns[] = {
- 1 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_POLL_ASS */
- 1 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_POLL_PSS */
- 1 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_POLL_DEAD */
- 1125 * NSEC_PER_USEC, /* FUSBH200_HRTIMER_UNLINK_INTR */
- 2 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_FREE_ITDS */
- 6 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_ASYNC_UNLINKS */
- 10 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_IAA_WATCHDOG */
- 10 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_DISABLE_PERIODIC */
- 15 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_DISABLE_ASYNC */
- 100 * NSEC_PER_MSEC, /* FUSBH200_HRTIMER_IO_WATCHDOG */
-};
-
-/* Enable a pending hrtimer event */
-static void fusbh200_enable_event(struct fusbh200_hcd *fusbh200, unsigned event,
- bool resched)
-{
- ktime_t *timeout = &fusbh200->hr_timeouts[event];
-
- if (resched)
- *timeout = ktime_add(ktime_get(),
- ktime_set(0, event_delays_ns[event]));
- fusbh200->enabled_hrtimer_events |= (1 << event);
-
- /* Track only the lowest-numbered pending event */
- if (event < fusbh200->next_hrtimer_event) {
- fusbh200->next_hrtimer_event = event;
- hrtimer_start_range_ns(&fusbh200->hrtimer, *timeout,
- NSEC_PER_MSEC, HRTIMER_MODE_ABS);
- }
-}
-
-
-/* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */
-static void fusbh200_poll_ASS(struct fusbh200_hcd *fusbh200)
-{
- unsigned actual, want;
-
- /* Don't enable anything if the controller isn't running (e.g., died) */
- if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
- return;
-
- want = (fusbh200->command & CMD_ASE) ? STS_ASS : 0;
- actual = fusbh200_readl(fusbh200, &fusbh200->regs->status) & STS_ASS;
-
- if (want != actual) {
-
- /* Poll again later, but give up after about 20 ms */
- if (fusbh200->ASS_poll_count++ < 20) {
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_POLL_ASS, true);
- return;
- }
- fusbh200_dbg(fusbh200, "Waited too long for the async schedule status (%x/%x), giving up\n",
- want, actual);
- }
- fusbh200->ASS_poll_count = 0;
-
- /* The status is up-to-date; restart or stop the schedule as needed */
- if (want == 0) { /* Stopped */
- if (fusbh200->async_count > 0)
- fusbh200_set_command_bit(fusbh200, CMD_ASE);
-
- } else { /* Running */
- if (fusbh200->async_count == 0) {
-
- /* Turn off the schedule after a while */
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_DISABLE_ASYNC,
- true);
- }
- }
-}
-
-/* Turn off the async schedule after a brief delay */
-static void fusbh200_disable_ASE(struct fusbh200_hcd *fusbh200)
-{
- fusbh200_clear_command_bit(fusbh200, CMD_ASE);
-}
-
-
-/* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
-static void fusbh200_poll_PSS(struct fusbh200_hcd *fusbh200)
-{
- unsigned actual, want;
-
- /* Don't do anything if the controller isn't running (e.g., died) */
- if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
- return;
-
- want = (fusbh200->command & CMD_PSE) ? STS_PSS : 0;
- actual = fusbh200_readl(fusbh200, &fusbh200->regs->status) & STS_PSS;
-
- if (want != actual) {
-
- /* Poll again later, but give up after about 20 ms */
- if (fusbh200->PSS_poll_count++ < 20) {
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_POLL_PSS, true);
- return;
- }
- fusbh200_dbg(fusbh200, "Waited too long for the periodic schedule status (%x/%x), giving up\n",
- want, actual);
- }
- fusbh200->PSS_poll_count = 0;
-
- /* The status is up-to-date; restart or stop the schedule as needed */
- if (want == 0) { /* Stopped */
- if (fusbh200->periodic_count > 0)
- fusbh200_set_command_bit(fusbh200, CMD_PSE);
-
- } else { /* Running */
- if (fusbh200->periodic_count == 0) {
-
- /* Turn off the schedule after a while */
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_DISABLE_PERIODIC,
- true);
- }
- }
-}
-
-/* Turn off the periodic schedule after a brief delay */
-static void fusbh200_disable_PSE(struct fusbh200_hcd *fusbh200)
-{
- fusbh200_clear_command_bit(fusbh200, CMD_PSE);
-}
-
-
-/* Poll the STS_HALT status bit; see when a dead controller stops */
-static void fusbh200_handle_controller_death(struct fusbh200_hcd *fusbh200)
-{
- if (!(fusbh200_readl(fusbh200, &fusbh200->regs->status) & STS_HALT)) {
-
- /* Give up after a few milliseconds */
- if (fusbh200->died_poll_count++ < 5) {
- /* Try again later */
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_POLL_DEAD, true);
- return;
- }
- fusbh200_warn(fusbh200, "Waited too long for the controller to stop, giving up\n");
- }
-
- /* Clean up the mess */
- fusbh200->rh_state = FUSBH200_RH_HALTED;
- fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
- fusbh200_work(fusbh200);
- end_unlink_async(fusbh200);
-
- /* Not in process context, so don't try to reset the controller */
-}
-
-
-/* Handle unlinked interrupt QHs once they are gone from the hardware */
-static void fusbh200_handle_intr_unlinks(struct fusbh200_hcd *fusbh200)
-{
- bool stopped = (fusbh200->rh_state < FUSBH200_RH_RUNNING);
-
- /*
- * Process all the QHs on the intr_unlink list that were added
- * before the current unlink cycle began. The list is in
- * temporal order, so stop when we reach the first entry in the
- * current cycle. But if the root hub isn't running then
- * process all the QHs on the list.
- */
- fusbh200->intr_unlinking = true;
- while (fusbh200->intr_unlink) {
- struct fusbh200_qh *qh = fusbh200->intr_unlink;
-
- if (!stopped && qh->unlink_cycle == fusbh200->intr_unlink_cycle)
- break;
- fusbh200->intr_unlink = qh->unlink_next;
- qh->unlink_next = NULL;
- end_unlink_intr(fusbh200, qh);
- }
-
- /* Handle remaining entries later */
- if (fusbh200->intr_unlink) {
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_UNLINK_INTR, true);
- ++fusbh200->intr_unlink_cycle;
- }
- fusbh200->intr_unlinking = false;
-}
-
-
-/* Start another free-iTDs/siTDs cycle */
-static void start_free_itds(struct fusbh200_hcd *fusbh200)
-{
- if (!(fusbh200->enabled_hrtimer_events & BIT(FUSBH200_HRTIMER_FREE_ITDS))) {
- fusbh200->last_itd_to_free = list_entry(
- fusbh200->cached_itd_list.prev,
- struct fusbh200_itd, itd_list);
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_FREE_ITDS, true);
- }
-}
-
-/* Wait for controller to stop using old iTDs and siTDs */
-static void end_free_itds(struct fusbh200_hcd *fusbh200)
-{
- struct fusbh200_itd *itd, *n;
-
- if (fusbh200->rh_state < FUSBH200_RH_RUNNING) {
- fusbh200->last_itd_to_free = NULL;
- }
-
- list_for_each_entry_safe(itd, n, &fusbh200->cached_itd_list, itd_list) {
- list_del(&itd->itd_list);
- dma_pool_free(fusbh200->itd_pool, itd, itd->itd_dma);
- if (itd == fusbh200->last_itd_to_free)
- break;
- }
-
- if (!list_empty(&fusbh200->cached_itd_list))
- start_free_itds(fusbh200);
-}
-
-
-/* Handle lost (or very late) IAA interrupts */
-static void fusbh200_iaa_watchdog(struct fusbh200_hcd *fusbh200)
-{
- if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
- return;
-
- /*
- * Lost IAA irqs wedge things badly; seen first with a vt8235.
- * So we need this watchdog, but must protect it against both
- * (a) SMP races against real IAA firing and retriggering, and
- * (b) clean HC shutdown, when IAA watchdog was pending.
- */
- if (fusbh200->async_iaa) {
- u32 cmd, status;
-
- /* If we get here, IAA is *REALLY* late. It's barely
- * conceivable that the system is so busy that CMD_IAAD
- * is still legitimately set, so let's be sure it's
- * clear before we read STS_IAA. (The HC should clear
- * CMD_IAAD when it sets STS_IAA.)
- */
- cmd = fusbh200_readl(fusbh200, &fusbh200->regs->command);
-
- /*
- * If IAA is set here it either legitimately triggered
- * after the watchdog timer expired (_way_ late, so we'll
- * still count it as lost) ... or a silicon erratum:
- * - VIA seems to set IAA without triggering the IRQ;
- * - IAAD potentially cleared without setting IAA.
- */
- status = fusbh200_readl(fusbh200, &fusbh200->regs->status);
- if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
- COUNT(fusbh200->stats.lost_iaa);
- fusbh200_writel(fusbh200, STS_IAA, &fusbh200->regs->status);
- }
-
- fusbh200_dbg(fusbh200, "IAA watchdog: status %x cmd %x\n",
- status, cmd);
- end_unlink_async(fusbh200);
- }
-}
-
-
-/* Enable the I/O watchdog, if appropriate */
-static void turn_on_io_watchdog(struct fusbh200_hcd *fusbh200)
-{
- /* Not needed if the controller isn't running or it's already enabled */
- if (fusbh200->rh_state != FUSBH200_RH_RUNNING ||
- (fusbh200->enabled_hrtimer_events &
- BIT(FUSBH200_HRTIMER_IO_WATCHDOG)))
- return;
-
- /*
- * Isochronous transfers always need the watchdog.
- * For other sorts we use it only if the flag is set.
- */
- if (fusbh200->isoc_count > 0 || (fusbh200->need_io_watchdog &&
- fusbh200->async_count + fusbh200->intr_count > 0))
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_IO_WATCHDOG, true);
-}
-
-
-/*
- * Handler functions for the hrtimer event types.
- * Keep this array in the same order as the event types indexed by
- * enum fusbh200_hrtimer_event in fusbh200.h.
- */
-static void (*event_handlers[])(struct fusbh200_hcd *) = {
- fusbh200_poll_ASS, /* FUSBH200_HRTIMER_POLL_ASS */
- fusbh200_poll_PSS, /* FUSBH200_HRTIMER_POLL_PSS */
- fusbh200_handle_controller_death, /* FUSBH200_HRTIMER_POLL_DEAD */
- fusbh200_handle_intr_unlinks, /* FUSBH200_HRTIMER_UNLINK_INTR */
- end_free_itds, /* FUSBH200_HRTIMER_FREE_ITDS */
- unlink_empty_async, /* FUSBH200_HRTIMER_ASYNC_UNLINKS */
- fusbh200_iaa_watchdog, /* FUSBH200_HRTIMER_IAA_WATCHDOG */
- fusbh200_disable_PSE, /* FUSBH200_HRTIMER_DISABLE_PERIODIC */
- fusbh200_disable_ASE, /* FUSBH200_HRTIMER_DISABLE_ASYNC */
- fusbh200_work, /* FUSBH200_HRTIMER_IO_WATCHDOG */
-};
-
-static enum hrtimer_restart fusbh200_hrtimer_func(struct hrtimer *t)
-{
- struct fusbh200_hcd *fusbh200 = container_of(t, struct fusbh200_hcd, hrtimer);
- ktime_t now;
- unsigned long events;
- unsigned long flags;
- unsigned e;
-
- spin_lock_irqsave(&fusbh200->lock, flags);
-
- events = fusbh200->enabled_hrtimer_events;
- fusbh200->enabled_hrtimer_events = 0;
- fusbh200->next_hrtimer_event = FUSBH200_HRTIMER_NO_EVENT;
-
- /*
- * Check each pending event. If its time has expired, handle
- * the event; otherwise re-enable it.
- */
- now = ktime_get();
- for_each_set_bit(e, &events, FUSBH200_HRTIMER_NUM_EVENTS) {
- if (now.tv64 >= fusbh200->hr_timeouts[e].tv64)
- event_handlers[e](fusbh200);
- else
- fusbh200_enable_event(fusbh200, e, false);
- }
-
- spin_unlock_irqrestore(&fusbh200->lock, flags);
- return HRTIMER_NORESTART;
-}
-
-/*-------------------------------------------------------------------------*/
-
-#define fusbh200_bus_suspend NULL
-#define fusbh200_bus_resume NULL
-
-/*-------------------------------------------------------------------------*/
-
-static int check_reset_complete (
- struct fusbh200_hcd *fusbh200,
- int index,
- u32 __iomem *status_reg,
- int port_status
-) {
- if (!(port_status & PORT_CONNECT))
- return port_status;
-
- /* if reset finished and it's still not enabled -- handoff */
- if (!(port_status & PORT_PE)) {
- /* with integrated TT, there's nobody to hand it to! */
- fusbh200_dbg (fusbh200,
- "Failed to enable port %d on root hub TT\n",
- index+1);
- return port_status;
- } else {
- fusbh200_dbg(fusbh200, "port %d reset complete, port enabled\n",
- index + 1);
- }
-
- return port_status;
-}
-
-/*-------------------------------------------------------------------------*/
-
-
-/* build "status change" packet (one or two bytes) from HC registers */
-
-static int
-fusbh200_hub_status_data (struct usb_hcd *hcd, char *buf)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- u32 temp, status;
- u32 mask;
- int retval = 1;
- unsigned long flags;
-
- /* init status to no-changes */
- buf [0] = 0;
-
- /* Inform the core about resumes-in-progress by returning
- * a non-zero value even if there are no status changes.
- */
- status = fusbh200->resuming_ports;
-
- mask = PORT_CSC | PORT_PEC;
- // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
-
- /* no hub change reports (bit 0) for now (power, ...) */
-
- /* port N changes (bit N)? */
- spin_lock_irqsave (&fusbh200->lock, flags);
-
- temp = fusbh200_readl(fusbh200, &fusbh200->regs->port_status);
-
- /*
- * Return status information even for ports with OWNER set.
- * Otherwise hub_wq wouldn't see the disconnect event when a
- * high-speed device is switched over to the companion
- * controller by the user.
- */
-
- if ((temp & mask) != 0 || test_bit(0, &fusbh200->port_c_suspend)
- || (fusbh200->reset_done[0] && time_after_eq(
- jiffies, fusbh200->reset_done[0]))) {
- buf [0] |= 1 << 1;
- status = STS_PCD;
- }
- /* FIXME autosuspend idle root hubs */
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- return status ? retval : 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void
-fusbh200_hub_descriptor (
- struct fusbh200_hcd *fusbh200,
- struct usb_hub_descriptor *desc
-) {
- int ports = HCS_N_PORTS (fusbh200->hcs_params);
- u16 temp;
-
- desc->bDescriptorType = USB_DT_HUB;
- desc->bPwrOn2PwrGood = 10; /* fusbh200 1.0, 2.3.9 says 20ms max */
- desc->bHubContrCurrent = 0;
-
- desc->bNbrPorts = ports;
- temp = 1 + (ports / 8);
- desc->bDescLength = 7 + 2 * temp;
-
- /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
- memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
- memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
-
- temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
- temp |= HUB_CHAR_NO_LPSM; /* no power switching */
- desc->wHubCharacteristics = cpu_to_le16(temp);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int fusbh200_hub_control (
- struct usb_hcd *hcd,
- u16 typeReq,
- u16 wValue,
- u16 wIndex,
- char *buf,
- u16 wLength
-) {
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- int ports = HCS_N_PORTS (fusbh200->hcs_params);
- u32 __iomem *status_reg = &fusbh200->regs->port_status;
- u32 temp, temp1, status;
- unsigned long flags;
- int retval = 0;
- unsigned selector;
-
- /*
- * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
- * HCS_INDICATOR may say we can change LEDs to off/amber/green.
- * (track current state ourselves) ... blink for diagnostics,
- * power, "this is the one", etc. EHCI spec supports this.
- */
-
- spin_lock_irqsave (&fusbh200->lock, flags);
- switch (typeReq) {
- case ClearHubFeature:
- switch (wValue) {
- case C_HUB_LOCAL_POWER:
- case C_HUB_OVER_CURRENT:
- /* no hub-wide feature/status flags */
- break;
- default:
- goto error;
- }
- break;
- case ClearPortFeature:
- if (!wIndex || wIndex > ports)
- goto error;
- wIndex--;
- temp = fusbh200_readl(fusbh200, status_reg);
- temp &= ~PORT_RWC_BITS;
-
- /*
- * Even if OWNER is set, so the port is owned by the
- * companion controller, hub_wq needs to be able to clear
- * the port-change status bits (especially
- * USB_PORT_STAT_C_CONNECTION).
- */
-
- switch (wValue) {
- case USB_PORT_FEAT_ENABLE:
- fusbh200_writel(fusbh200, temp & ~PORT_PE, status_reg);
- break;
- case USB_PORT_FEAT_C_ENABLE:
- fusbh200_writel(fusbh200, temp | PORT_PEC, status_reg);
- break;
- case USB_PORT_FEAT_SUSPEND:
- if (temp & PORT_RESET)
- goto error;
- if (!(temp & PORT_SUSPEND))
- break;
- if ((temp & PORT_PE) == 0)
- goto error;
-
- fusbh200_writel(fusbh200, temp | PORT_RESUME, status_reg);
- fusbh200->reset_done[wIndex] = jiffies
- + msecs_to_jiffies(USB_RESUME_TIMEOUT);
- break;
- case USB_PORT_FEAT_C_SUSPEND:
- clear_bit(wIndex, &fusbh200->port_c_suspend);
- break;
- case USB_PORT_FEAT_C_CONNECTION:
- fusbh200_writel(fusbh200, temp | PORT_CSC, status_reg);
- break;
- case USB_PORT_FEAT_C_OVER_CURRENT:
- fusbh200_writel(fusbh200, temp | BMISR_OVC, &fusbh200->regs->bmisr);
- break;
- case USB_PORT_FEAT_C_RESET:
- /* GetPortStatus clears reset */
- break;
- default:
- goto error;
- }
- fusbh200_readl(fusbh200, &fusbh200->regs->command); /* unblock posted write */
- break;
- case GetHubDescriptor:
- fusbh200_hub_descriptor (fusbh200, (struct usb_hub_descriptor *)
- buf);
- break;
- case GetHubStatus:
- /* no hub-wide feature/status flags */
- memset (buf, 0, 4);
- //cpu_to_le32s ((u32 *) buf);
- break;
- case GetPortStatus:
- if (!wIndex || wIndex > ports)
- goto error;
- wIndex--;
- status = 0;
- temp = fusbh200_readl(fusbh200, status_reg);
-
- // wPortChange bits
- if (temp & PORT_CSC)
- status |= USB_PORT_STAT_C_CONNECTION << 16;
- if (temp & PORT_PEC)
- status |= USB_PORT_STAT_C_ENABLE << 16;
-
- temp1 = fusbh200_readl(fusbh200, &fusbh200->regs->bmisr);
- if (temp1 & BMISR_OVC)
- status |= USB_PORT_STAT_C_OVERCURRENT << 16;
-
- /* whoever resumes must GetPortStatus to complete it!! */
- if (temp & PORT_RESUME) {
-
- /* Remote Wakeup received? */
- if (!fusbh200->reset_done[wIndex]) {
- /* resume signaling for 20 msec */
- fusbh200->reset_done[wIndex] = jiffies
- + msecs_to_jiffies(20);
- /* check the port again */
- mod_timer(&fusbh200_to_hcd(fusbh200)->rh_timer,
- fusbh200->reset_done[wIndex]);
- }
-
- /* resume completed? */
- else if (time_after_eq(jiffies,
- fusbh200->reset_done[wIndex])) {
- clear_bit(wIndex, &fusbh200->suspended_ports);
- set_bit(wIndex, &fusbh200->port_c_suspend);
- fusbh200->reset_done[wIndex] = 0;
-
- /* stop resume signaling */
- temp = fusbh200_readl(fusbh200, status_reg);
- fusbh200_writel(fusbh200,
- temp & ~(PORT_RWC_BITS | PORT_RESUME),
- status_reg);
- clear_bit(wIndex, &fusbh200->resuming_ports);
- retval = handshake(fusbh200, status_reg,
- PORT_RESUME, 0, 2000 /* 2msec */);
- if (retval != 0) {
- fusbh200_err(fusbh200,
- "port %d resume error %d\n",
- wIndex + 1, retval);
- goto error;
- }
- temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
- }
- }
-
- /* whoever resets must GetPortStatus to complete it!! */
- if ((temp & PORT_RESET)
- && time_after_eq(jiffies,
- fusbh200->reset_done[wIndex])) {
- status |= USB_PORT_STAT_C_RESET << 16;
- fusbh200->reset_done [wIndex] = 0;
- clear_bit(wIndex, &fusbh200->resuming_ports);
-
- /* force reset to complete */
- fusbh200_writel(fusbh200, temp & ~(PORT_RWC_BITS | PORT_RESET),
- status_reg);
- /* REVISIT: some hardware needs 550+ usec to clear
- * this bit; seems too long to spin routinely...
- */
- retval = handshake(fusbh200, status_reg,
- PORT_RESET, 0, 1000);
- if (retval != 0) {
- fusbh200_err (fusbh200, "port %d reset error %d\n",
- wIndex + 1, retval);
- goto error;
- }
-
- /* see what we found out */
- temp = check_reset_complete (fusbh200, wIndex, status_reg,
- fusbh200_readl(fusbh200, status_reg));
- }
-
- if (!(temp & (PORT_RESUME|PORT_RESET))) {
- fusbh200->reset_done[wIndex] = 0;
- clear_bit(wIndex, &fusbh200->resuming_ports);
- }
-
- /* transfer dedicated ports to the companion hc */
- if ((temp & PORT_CONNECT) &&
- test_bit(wIndex, &fusbh200->companion_ports)) {
- temp &= ~PORT_RWC_BITS;
- fusbh200_writel(fusbh200, temp, status_reg);
- fusbh200_dbg(fusbh200, "port %d --> companion\n", wIndex + 1);
- temp = fusbh200_readl(fusbh200, status_reg);
- }
-
- /*
- * Even if OWNER is set, there's no harm letting hub_wq
- * see the wPortStatus values (they should all be 0 except
- * for PORT_POWER anyway).
- */
-
- if (temp & PORT_CONNECT) {
- status |= USB_PORT_STAT_CONNECTION;
- status |= fusbh200_port_speed(fusbh200, temp);
- }
- if (temp & PORT_PE)
- status |= USB_PORT_STAT_ENABLE;
-
- /* maybe the port was unsuspended without our knowledge */
- if (temp & (PORT_SUSPEND|PORT_RESUME)) {
- status |= USB_PORT_STAT_SUSPEND;
- } else if (test_bit(wIndex, &fusbh200->suspended_ports)) {
- clear_bit(wIndex, &fusbh200->suspended_ports);
- clear_bit(wIndex, &fusbh200->resuming_ports);
- fusbh200->reset_done[wIndex] = 0;
- if (temp & PORT_PE)
- set_bit(wIndex, &fusbh200->port_c_suspend);
- }
-
- temp1 = fusbh200_readl(fusbh200, &fusbh200->regs->bmisr);
- if (temp1 & BMISR_OVC)
- status |= USB_PORT_STAT_OVERCURRENT;
- if (temp & PORT_RESET)
- status |= USB_PORT_STAT_RESET;
- if (test_bit(wIndex, &fusbh200->port_c_suspend))
- status |= USB_PORT_STAT_C_SUSPEND << 16;
-
- if (status & ~0xffff) /* only if wPortChange is interesting */
- dbg_port(fusbh200, "GetStatus", wIndex + 1, temp);
- put_unaligned_le32(status, buf);
- break;
- case SetHubFeature:
- switch (wValue) {
- case C_HUB_LOCAL_POWER:
- case C_HUB_OVER_CURRENT:
- /* no hub-wide feature/status flags */
- break;
- default:
- goto error;
- }
- break;
- case SetPortFeature:
- selector = wIndex >> 8;
- wIndex &= 0xff;
-
- if (!wIndex || wIndex > ports)
- goto error;
- wIndex--;
- temp = fusbh200_readl(fusbh200, status_reg);
- temp &= ~PORT_RWC_BITS;
- switch (wValue) {
- case USB_PORT_FEAT_SUSPEND:
- if ((temp & PORT_PE) == 0
- || (temp & PORT_RESET) != 0)
- goto error;
-
- /* After above check the port must be connected.
- * Set appropriate bit thus could put phy into low power
- * mode if we have hostpc feature
- */
- fusbh200_writel(fusbh200, temp | PORT_SUSPEND, status_reg);
- set_bit(wIndex, &fusbh200->suspended_ports);
- break;
- case USB_PORT_FEAT_RESET:
- if (temp & PORT_RESUME)
- goto error;
- /* line status bits may report this as low speed,
- * which can be fine if this root hub has a
- * transaction translator built in.
- */
- fusbh200_dbg(fusbh200, "port %d reset\n", wIndex + 1);
- temp |= PORT_RESET;
- temp &= ~PORT_PE;
-
- /*
- * caller must wait, then call GetPortStatus
- * usb 2.0 spec says 50 ms resets on root
- */
- fusbh200->reset_done [wIndex] = jiffies
- + msecs_to_jiffies (50);
- fusbh200_writel(fusbh200, temp, status_reg);
- break;
-
- /* For downstream facing ports (these): one hub port is put
- * into test mode according to USB2 11.24.2.13, then the hub
- * must be reset (which for root hub now means rmmod+modprobe,
- * or else system reboot). See EHCI 2.3.9 and 4.14 for info
- * about the EHCI-specific stuff.
- */
- case USB_PORT_FEAT_TEST:
- if (!selector || selector > 5)
- goto error;
- spin_unlock_irqrestore(&fusbh200->lock, flags);
- fusbh200_quiesce(fusbh200);
- spin_lock_irqsave(&fusbh200->lock, flags);
-
- /* Put all enabled ports into suspend */
- temp = fusbh200_readl(fusbh200, status_reg) & ~PORT_RWC_BITS;
- if (temp & PORT_PE)
- fusbh200_writel(fusbh200, temp | PORT_SUSPEND,
- status_reg);
-
- spin_unlock_irqrestore(&fusbh200->lock, flags);
- fusbh200_halt(fusbh200);
- spin_lock_irqsave(&fusbh200->lock, flags);
-
- temp = fusbh200_readl(fusbh200, status_reg);
- temp |= selector << 16;
- fusbh200_writel(fusbh200, temp, status_reg);
- break;
-
- default:
- goto error;
- }
- fusbh200_readl(fusbh200, &fusbh200->regs->command); /* unblock posted writes */
- break;
-
- default:
-error:
- /* "stall" on error */
- retval = -EPIPE;
- }
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- return retval;
-}
-
-static void __maybe_unused fusbh200_relinquish_port(struct usb_hcd *hcd,
- int portnum)
-{
- return;
-}
-
-static int __maybe_unused fusbh200_port_handed_over(struct usb_hcd *hcd,
- int portnum)
-{
- return 0;
-}
-/*-------------------------------------------------------------------------*/
-/*
- * There's basically three types of memory:
- * - data used only by the HCD ... kmalloc is fine
- * - async and periodic schedules, shared by HC and HCD ... these
- * need to use dma_pool or dma_alloc_coherent
- * - driver buffers, read/written by HC ... single shot DMA mapped
- *
- * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
- * No memory seen by this driver is pageable.
- */
-
-/*-------------------------------------------------------------------------*/
-
-/* Allocate the key transfer structures from the previously allocated pool */
-
-static inline void fusbh200_qtd_init(struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd,
- dma_addr_t dma)
-{
- memset (qtd, 0, sizeof *qtd);
- qtd->qtd_dma = dma;
- qtd->hw_token = cpu_to_hc32(fusbh200, QTD_STS_HALT);
- qtd->hw_next = FUSBH200_LIST_END(fusbh200);
- qtd->hw_alt_next = FUSBH200_LIST_END(fusbh200);
- INIT_LIST_HEAD (&qtd->qtd_list);
-}
-
-static struct fusbh200_qtd *fusbh200_qtd_alloc (struct fusbh200_hcd *fusbh200, gfp_t flags)
-{
- struct fusbh200_qtd *qtd;
- dma_addr_t dma;
-
- qtd = dma_pool_alloc (fusbh200->qtd_pool, flags, &dma);
- if (qtd != NULL) {
- fusbh200_qtd_init(fusbh200, qtd, dma);
- }
- return qtd;
-}
-
-static inline void fusbh200_qtd_free (struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd)
-{
- dma_pool_free (fusbh200->qtd_pool, qtd, qtd->qtd_dma);
-}
-
-
-static void qh_destroy(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- /* clean qtds first, and know this is not linked */
- if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
- fusbh200_dbg (fusbh200, "unused qh not empty!\n");
- BUG ();
- }
- if (qh->dummy)
- fusbh200_qtd_free (fusbh200, qh->dummy);
- dma_pool_free(fusbh200->qh_pool, qh->hw, qh->qh_dma);
- kfree(qh);
-}
-
-static struct fusbh200_qh *fusbh200_qh_alloc (struct fusbh200_hcd *fusbh200, gfp_t flags)
-{
- struct fusbh200_qh *qh;
- dma_addr_t dma;
-
- qh = kzalloc(sizeof *qh, GFP_ATOMIC);
- if (!qh)
- goto done;
- qh->hw = (struct fusbh200_qh_hw *)
- dma_pool_alloc(fusbh200->qh_pool, flags, &dma);
- if (!qh->hw)
- goto fail;
- memset(qh->hw, 0, sizeof *qh->hw);
- qh->qh_dma = dma;
- // INIT_LIST_HEAD (&qh->qh_list);
- INIT_LIST_HEAD (&qh->qtd_list);
-
- /* dummy td enables safe urb queuing */
- qh->dummy = fusbh200_qtd_alloc (fusbh200, flags);
- if (qh->dummy == NULL) {
- fusbh200_dbg (fusbh200, "no dummy td\n");
- goto fail1;
- }
-done:
- return qh;
-fail1:
- dma_pool_free(fusbh200->qh_pool, qh->hw, qh->qh_dma);
-fail:
- kfree(qh);
- return NULL;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* The queue heads and transfer descriptors are managed from pools tied
- * to each of the "per device" structures.
- * This is the initialisation and cleanup code.
- */
-
-static void fusbh200_mem_cleanup (struct fusbh200_hcd *fusbh200)
-{
- if (fusbh200->async)
- qh_destroy(fusbh200, fusbh200->async);
- fusbh200->async = NULL;
-
- if (fusbh200->dummy)
- qh_destroy(fusbh200, fusbh200->dummy);
- fusbh200->dummy = NULL;
-
- /* DMA consistent memory and pools */
- dma_pool_destroy(fusbh200->qtd_pool);
- fusbh200->qtd_pool = NULL;
-
- dma_pool_destroy(fusbh200->qh_pool);
- fusbh200->qh_pool = NULL;
-
- dma_pool_destroy(fusbh200->itd_pool);
- fusbh200->itd_pool = NULL;
-
- if (fusbh200->periodic)
- dma_free_coherent (fusbh200_to_hcd(fusbh200)->self.controller,
- fusbh200->periodic_size * sizeof (u32),
- fusbh200->periodic, fusbh200->periodic_dma);
- fusbh200->periodic = NULL;
-
- /* shadow periodic table */
- kfree(fusbh200->pshadow);
- fusbh200->pshadow = NULL;
-}
-
-/* remember to add cleanup code (above) if you add anything here */
-static int fusbh200_mem_init (struct fusbh200_hcd *fusbh200, gfp_t flags)
-{
- int i;
-
- /* QTDs for control/bulk/intr transfers */
- fusbh200->qtd_pool = dma_pool_create ("fusbh200_qtd",
- fusbh200_to_hcd(fusbh200)->self.controller,
- sizeof (struct fusbh200_qtd),
- 32 /* byte alignment (for hw parts) */,
- 4096 /* can't cross 4K */);
- if (!fusbh200->qtd_pool) {
- goto fail;
- }
-
- /* QHs for control/bulk/intr transfers */
- fusbh200->qh_pool = dma_pool_create ("fusbh200_qh",
- fusbh200_to_hcd(fusbh200)->self.controller,
- sizeof(struct fusbh200_qh_hw),
- 32 /* byte alignment (for hw parts) */,
- 4096 /* can't cross 4K */);
- if (!fusbh200->qh_pool) {
- goto fail;
- }
- fusbh200->async = fusbh200_qh_alloc (fusbh200, flags);
- if (!fusbh200->async) {
- goto fail;
- }
-
- /* ITD for high speed ISO transfers */
- fusbh200->itd_pool = dma_pool_create ("fusbh200_itd",
- fusbh200_to_hcd(fusbh200)->self.controller,
- sizeof (struct fusbh200_itd),
- 64 /* byte alignment (for hw parts) */,
- 4096 /* can't cross 4K */);
- if (!fusbh200->itd_pool) {
- goto fail;
- }
-
- /* Hardware periodic table */
- fusbh200->periodic = (__le32 *)
- dma_alloc_coherent (fusbh200_to_hcd(fusbh200)->self.controller,
- fusbh200->periodic_size * sizeof(__le32),
- &fusbh200->periodic_dma, 0);
- if (fusbh200->periodic == NULL) {
- goto fail;
- }
-
- for (i = 0; i < fusbh200->periodic_size; i++)
- fusbh200->periodic[i] = FUSBH200_LIST_END(fusbh200);
-
- /* software shadow of hardware table */
- fusbh200->pshadow = kcalloc(fusbh200->periodic_size, sizeof(void *), flags);
- if (fusbh200->pshadow != NULL)
- return 0;
-
-fail:
- fusbh200_dbg (fusbh200, "couldn't init memory\n");
- fusbh200_mem_cleanup (fusbh200);
- return -ENOMEM;
-}
-/*-------------------------------------------------------------------------*/
-/*
- * EHCI hardware queue manipulation ... the core. QH/QTD manipulation.
- *
- * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd"
- * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
- * buffers needed for the larger number). We use one QH per endpoint, queue
- * multiple urbs (all three types) per endpoint. URBs may need several qtds.
- *
- * ISO traffic uses "ISO TD" (itd) records, and (along with
- * interrupts) needs careful scheduling. Performance improvements can be
- * an ongoing challenge. That's in "ehci-sched.c".
- *
- * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
- * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
- * (b) special fields in qh entries or (c) split iso entries. TTs will
- * buffer low/full speed data so the host collects it at high speed.
- */
-
-/*-------------------------------------------------------------------------*/
-
-/* fill a qtd, returning how much of the buffer we were able to queue up */
-
-static int
-qtd_fill(struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd, dma_addr_t buf,
- size_t len, int token, int maxpacket)
-{
- int i, count;
- u64 addr = buf;
-
- /* one buffer entry per 4K ... first might be short or unaligned */
- qtd->hw_buf[0] = cpu_to_hc32(fusbh200, (u32)addr);
- qtd->hw_buf_hi[0] = cpu_to_hc32(fusbh200, (u32)(addr >> 32));
- count = 0x1000 - (buf & 0x0fff); /* rest of that page */
- if (likely (len < count)) /* ... iff needed */
- count = len;
- else {
- buf += 0x1000;
- buf &= ~0x0fff;
-
- /* per-qtd limit: from 16K to 20K (best alignment) */
- for (i = 1; count < len && i < 5; i++) {
- addr = buf;
- qtd->hw_buf[i] = cpu_to_hc32(fusbh200, (u32)addr);
- qtd->hw_buf_hi[i] = cpu_to_hc32(fusbh200,
- (u32)(addr >> 32));
- buf += 0x1000;
- if ((count + 0x1000) < len)
- count += 0x1000;
- else
- count = len;
- }
-
- /* short packets may only terminate transfers */
- if (count != len)
- count -= (count % maxpacket);
- }
- qtd->hw_token = cpu_to_hc32(fusbh200, (count << 16) | token);
- qtd->length = count;
-
- return count;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static inline void
-qh_update (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh, struct fusbh200_qtd *qtd)
-{
- struct fusbh200_qh_hw *hw = qh->hw;
-
- /* writes to an active overlay are unsafe */
- BUG_ON(qh->qh_state != QH_STATE_IDLE);
-
- hw->hw_qtd_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
- hw->hw_alt_next = FUSBH200_LIST_END(fusbh200);
-
- /* Except for control endpoints, we make hardware maintain data
- * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
- * and set the pseudo-toggle in udev. Only usb_clear_halt() will
- * ever clear it.
- */
- if (!(hw->hw_info1 & cpu_to_hc32(fusbh200, QH_TOGGLE_CTL))) {
- unsigned is_out, epnum;
-
- is_out = qh->is_out;
- epnum = (hc32_to_cpup(fusbh200, &hw->hw_info1) >> 8) & 0x0f;
- if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
- hw->hw_token &= ~cpu_to_hc32(fusbh200, QTD_TOGGLE);
- usb_settoggle (qh->dev, epnum, is_out, 1);
- }
- }
-
- hw->hw_token &= cpu_to_hc32(fusbh200, QTD_TOGGLE | QTD_STS_PING);
-}
-
-/* if it weren't for a common silicon quirk (writing the dummy into the qh
- * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
- * recovery (including urb dequeue) would need software changes to a QH...
- */
-static void
-qh_refresh (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- struct fusbh200_qtd *qtd;
-
- if (list_empty (&qh->qtd_list))
- qtd = qh->dummy;
- else {
- qtd = list_entry (qh->qtd_list.next,
- struct fusbh200_qtd, qtd_list);
- /*
- * first qtd may already be partially processed.
- * If we come here during unlink, the QH overlay region
- * might have reference to the just unlinked qtd. The
- * qtd is updated in qh_completions(). Update the QH
- * overlay here.
- */
- if (cpu_to_hc32(fusbh200, qtd->qtd_dma) == qh->hw->hw_current) {
- qh->hw->hw_qtd_next = qtd->hw_next;
- qtd = NULL;
- }
- }
-
- if (qtd)
- qh_update (fusbh200, qh, qtd);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void qh_link_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
-
-static void fusbh200_clear_tt_buffer_complete(struct usb_hcd *hcd,
- struct usb_host_endpoint *ep)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
- struct fusbh200_qh *qh = ep->hcpriv;
- unsigned long flags;
-
- spin_lock_irqsave(&fusbh200->lock, flags);
- qh->clearing_tt = 0;
- if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
- && fusbh200->rh_state == FUSBH200_RH_RUNNING)
- qh_link_async(fusbh200, qh);
- spin_unlock_irqrestore(&fusbh200->lock, flags);
-}
-
-static void fusbh200_clear_tt_buffer(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh,
- struct urb *urb, u32 token)
-{
-
- /* If an async split transaction gets an error or is unlinked,
- * the TT buffer may be left in an indeterminate state. We
- * have to clear the TT buffer.
- *
- * Note: this routine is never called for Isochronous transfers.
- */
- if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
- struct usb_device *tt = urb->dev->tt->hub;
-
- dev_dbg(&tt->dev,
- "clear tt buffer port %d, a%d ep%d t%08x\n",
- urb->dev->ttport, urb->dev->devnum,
- usb_pipeendpoint(urb->pipe), token);
-
- if (urb->dev->tt->hub !=
- fusbh200_to_hcd(fusbh200)->self.root_hub) {
- if (usb_hub_clear_tt_buffer(urb) == 0)
- qh->clearing_tt = 1;
- }
- }
-}
-
-static int qtd_copy_status (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- size_t length,
- u32 token
-)
-{
- int status = -EINPROGRESS;
-
- /* count IN/OUT bytes, not SETUP (even short packets) */
- if (likely (QTD_PID (token) != 2))
- urb->actual_length += length - QTD_LENGTH (token);
-
- /* don't modify error codes */
- if (unlikely(urb->unlinked))
- return status;
-
- /* force cleanup after short read; not always an error */
- if (unlikely (IS_SHORT_READ (token)))
- status = -EREMOTEIO;
-
- /* serious "can't proceed" faults reported by the hardware */
- if (token & QTD_STS_HALT) {
- if (token & QTD_STS_BABBLE) {
- /* FIXME "must" disable babbling device's port too */
- status = -EOVERFLOW;
- /* CERR nonzero + halt --> stall */
- } else if (QTD_CERR(token)) {
- status = -EPIPE;
-
- /* In theory, more than one of the following bits can be set
- * since they are sticky and the transaction is retried.
- * Which to test first is rather arbitrary.
- */
- } else if (token & QTD_STS_MMF) {
- /* fs/ls interrupt xfer missed the complete-split */
- status = -EPROTO;
- } else if (token & QTD_STS_DBE) {
- status = (QTD_PID (token) == 1) /* IN ? */
- ? -ENOSR /* hc couldn't read data */
- : -ECOMM; /* hc couldn't write data */
- } else if (token & QTD_STS_XACT) {
- /* timeout, bad CRC, wrong PID, etc */
- fusbh200_dbg(fusbh200, "devpath %s ep%d%s 3strikes\n",
- urb->dev->devpath,
- usb_pipeendpoint(urb->pipe),
- usb_pipein(urb->pipe) ? "in" : "out");
- status = -EPROTO;
- } else { /* unknown */
- status = -EPROTO;
- }
-
- fusbh200_dbg(fusbh200,
- "dev%d ep%d%s qtd token %08x --> status %d\n",
- usb_pipedevice (urb->pipe),
- usb_pipeendpoint (urb->pipe),
- usb_pipein (urb->pipe) ? "in" : "out",
- token, status);
- }
-
- return status;
-}
-
-static void
-fusbh200_urb_done(struct fusbh200_hcd *fusbh200, struct urb *urb, int status)
-__releases(fusbh200->lock)
-__acquires(fusbh200->lock)
-{
- if (likely (urb->hcpriv != NULL)) {
- struct fusbh200_qh *qh = (struct fusbh200_qh *) urb->hcpriv;
-
- /* S-mask in a QH means it's an interrupt urb */
- if ((qh->hw->hw_info2 & cpu_to_hc32(fusbh200, QH_SMASK)) != 0) {
-
- /* ... update hc-wide periodic stats (for usbfs) */
- fusbh200_to_hcd(fusbh200)->self.bandwidth_int_reqs--;
- }
- }
-
- if (unlikely(urb->unlinked)) {
- COUNT(fusbh200->stats.unlink);
- } else {
- /* report non-error and short read status as zero */
- if (status == -EINPROGRESS || status == -EREMOTEIO)
- status = 0;
- COUNT(fusbh200->stats.complete);
- }
-
-#ifdef FUSBH200_URB_TRACE
- fusbh200_dbg (fusbh200,
- "%s %s urb %p ep%d%s status %d len %d/%d\n",
- __func__, urb->dev->devpath, urb,
- usb_pipeendpoint (urb->pipe),
- usb_pipein (urb->pipe) ? "in" : "out",
- status,
- urb->actual_length, urb->transfer_buffer_length);
-#endif
-
- /* complete() can reenter this HCD */
- usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
- spin_unlock (&fusbh200->lock);
- usb_hcd_giveback_urb(fusbh200_to_hcd(fusbh200), urb, status);
- spin_lock (&fusbh200->lock);
-}
-
-static int qh_schedule (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
-
-/*
- * Process and free completed qtds for a qh, returning URBs to drivers.
- * Chases up to qh->hw_current. Returns number of completions called,
- * indicating how much "real" work we did.
- */
-static unsigned
-qh_completions (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- struct fusbh200_qtd *last, *end = qh->dummy;
- struct list_head *entry, *tmp;
- int last_status;
- int stopped;
- unsigned count = 0;
- u8 state;
- struct fusbh200_qh_hw *hw = qh->hw;
-
- if (unlikely (list_empty (&qh->qtd_list)))
- return count;
-
- /* completions (or tasks on other cpus) must never clobber HALT
- * till we've gone through and cleaned everything up, even when
- * they add urbs to this qh's queue or mark them for unlinking.
- *
- * NOTE: unlinking expects to be done in queue order.
- *
- * It's a bug for qh->qh_state to be anything other than
- * QH_STATE_IDLE, unless our caller is scan_async() or
- * scan_intr().
- */
- state = qh->qh_state;
- qh->qh_state = QH_STATE_COMPLETING;
- stopped = (state == QH_STATE_IDLE);
-
- rescan:
- last = NULL;
- last_status = -EINPROGRESS;
- qh->needs_rescan = 0;
-
- /* remove de-activated QTDs from front of queue.
- * after faults (including short reads), cleanup this urb
- * then let the queue advance.
- * if queue is stopped, handles unlinks.
- */
- list_for_each_safe (entry, tmp, &qh->qtd_list) {
- struct fusbh200_qtd *qtd;
- struct urb *urb;
- u32 token = 0;
-
- qtd = list_entry (entry, struct fusbh200_qtd, qtd_list);
- urb = qtd->urb;
-
- /* clean up any state from previous QTD ...*/
- if (last) {
- if (likely (last->urb != urb)) {
- fusbh200_urb_done(fusbh200, last->urb, last_status);
- count++;
- last_status = -EINPROGRESS;
- }
- fusbh200_qtd_free (fusbh200, last);
- last = NULL;
- }
-
- /* ignore urbs submitted during completions we reported */
- if (qtd == end)
- break;
-
- /* hardware copies qtd out of qh overlay */
- rmb ();
- token = hc32_to_cpu(fusbh200, qtd->hw_token);
-
- /* always clean up qtds the hc de-activated */
- retry_xacterr:
- if ((token & QTD_STS_ACTIVE) == 0) {
-
- /* Report Data Buffer Error: non-fatal but useful */
- if (token & QTD_STS_DBE)
- fusbh200_dbg(fusbh200,
- "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
- urb,
- usb_endpoint_num(&urb->ep->desc),
- usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out",
- urb->transfer_buffer_length,
- qtd,
- qh);
-
- /* on STALL, error, and short reads this urb must
- * complete and all its qtds must be recycled.
- */
- if ((token & QTD_STS_HALT) != 0) {
-
- /* retry transaction errors until we
- * reach the software xacterr limit
- */
- if ((token & QTD_STS_XACT) &&
- QTD_CERR(token) == 0 &&
- ++qh->xacterrs < QH_XACTERR_MAX &&
- !urb->unlinked) {
- fusbh200_dbg(fusbh200,
- "detected XactErr len %zu/%zu retry %d\n",
- qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
-
- /* reset the token in the qtd and the
- * qh overlay (which still contains
- * the qtd) so that we pick up from
- * where we left off
- */
- token &= ~QTD_STS_HALT;
- token |= QTD_STS_ACTIVE |
- (FUSBH200_TUNE_CERR << 10);
- qtd->hw_token = cpu_to_hc32(fusbh200,
- token);
- wmb();
- hw->hw_token = cpu_to_hc32(fusbh200,
- token);
- goto retry_xacterr;
- }
- stopped = 1;
-
- /* magic dummy for some short reads; qh won't advance.
- * that silicon quirk can kick in with this dummy too.
- *
- * other short reads won't stop the queue, including
- * control transfers (status stage handles that) or
- * most other single-qtd reads ... the queue stops if
- * URB_SHORT_NOT_OK was set so the driver submitting
- * the urbs could clean it up.
- */
- } else if (IS_SHORT_READ (token)
- && !(qtd->hw_alt_next
- & FUSBH200_LIST_END(fusbh200))) {
- stopped = 1;
- }
-
- /* stop scanning when we reach qtds the hc is using */
- } else if (likely (!stopped
- && fusbh200->rh_state >= FUSBH200_RH_RUNNING)) {
- break;
-
- /* scan the whole queue for unlinks whenever it stops */
- } else {
- stopped = 1;
-
- /* cancel everything if we halt, suspend, etc */
- if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
- last_status = -ESHUTDOWN;
-
- /* this qtd is active; skip it unless a previous qtd
- * for its urb faulted, or its urb was canceled.
- */
- else if (last_status == -EINPROGRESS && !urb->unlinked)
- continue;
-
- /* qh unlinked; token in overlay may be most current */
- if (state == QH_STATE_IDLE
- && cpu_to_hc32(fusbh200, qtd->qtd_dma)
- == hw->hw_current) {
- token = hc32_to_cpu(fusbh200, hw->hw_token);
-
- /* An unlink may leave an incomplete
- * async transaction in the TT buffer.
- * We have to clear it.
- */
- fusbh200_clear_tt_buffer(fusbh200, qh, urb, token);
- }
- }
-
- /* unless we already know the urb's status, collect qtd status
- * and update count of bytes transferred. in common short read
- * cases with only one data qtd (including control transfers),
- * queue processing won't halt. but with two or more qtds (for
- * example, with a 32 KB transfer), when the first qtd gets a
- * short read the second must be removed by hand.
- */
- if (last_status == -EINPROGRESS) {
- last_status = qtd_copy_status(fusbh200, urb,
- qtd->length, token);
- if (last_status == -EREMOTEIO
- && (qtd->hw_alt_next
- & FUSBH200_LIST_END(fusbh200)))
- last_status = -EINPROGRESS;
-
- /* As part of low/full-speed endpoint-halt processing
- * we must clear the TT buffer (11.17.5).
- */
- if (unlikely(last_status != -EINPROGRESS &&
- last_status != -EREMOTEIO)) {
- /* The TT's in some hubs malfunction when they
- * receive this request following a STALL (they
- * stop sending isochronous packets). Since a
- * STALL can't leave the TT buffer in a busy
- * state (if you believe Figures 11-48 - 11-51
- * in the USB 2.0 spec), we won't clear the TT
- * buffer in this case. Strictly speaking this
- * is a violation of the spec.
- */
- if (last_status != -EPIPE)
- fusbh200_clear_tt_buffer(fusbh200, qh, urb,
- token);
- }
- }
-
- /* if we're removing something not at the queue head,
- * patch the hardware queue pointer.
- */
- if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
- last = list_entry (qtd->qtd_list.prev,
- struct fusbh200_qtd, qtd_list);
- last->hw_next = qtd->hw_next;
- }
-
- /* remove qtd; it's recycled after possible urb completion */
- list_del (&qtd->qtd_list);
- last = qtd;
-
- /* reinit the xacterr counter for the next qtd */
- qh->xacterrs = 0;
- }
-
- /* last urb's completion might still need calling */
- if (likely (last != NULL)) {
- fusbh200_urb_done(fusbh200, last->urb, last_status);
- count++;
- fusbh200_qtd_free (fusbh200, last);
- }
-
- /* Do we need to rescan for URBs dequeued during a giveback? */
- if (unlikely(qh->needs_rescan)) {
- /* If the QH is already unlinked, do the rescan now. */
- if (state == QH_STATE_IDLE)
- goto rescan;
-
- /* Otherwise we have to wait until the QH is fully unlinked.
- * Our caller will start an unlink if qh->needs_rescan is
- * set. But if an unlink has already started, nothing needs
- * to be done.
- */
- if (state != QH_STATE_LINKED)
- qh->needs_rescan = 0;
- }
-
- /* restore original state; caller must unlink or relink */
- qh->qh_state = state;
-
- /* be sure the hardware's done with the qh before refreshing
- * it after fault cleanup, or recovering from silicon wrongly
- * overlaying the dummy qtd (which reduces DMA chatter).
- */
- if (stopped != 0 || hw->hw_qtd_next == FUSBH200_LIST_END(fusbh200)) {
- switch (state) {
- case QH_STATE_IDLE:
- qh_refresh(fusbh200, qh);
- break;
- case QH_STATE_LINKED:
- /* We won't refresh a QH that's linked (after the HC
- * stopped the queue). That avoids a race:
- * - HC reads first part of QH;
- * - CPU updates that first part and the token;
- * - HC reads rest of that QH, including token
- * Result: HC gets an inconsistent image, and then
- * DMAs to/from the wrong memory (corrupting it).
- *
- * That should be rare for interrupt transfers,
- * except maybe high bandwidth ...
- */
-
- /* Tell the caller to start an unlink */
- qh->needs_rescan = 1;
- break;
- /* otherwise, unlink already started */
- }
- }
-
- return count;
-}
-
-/*-------------------------------------------------------------------------*/
-
-// high bandwidth multiplier, as encoded in highspeed endpoint descriptors
-#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
-// ... and packet size, for any kind of endpoint descriptor
-#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
-
-/*
- * reverse of qh_urb_transaction: free a list of TDs.
- * used for cleanup after errors, before HC sees an URB's TDs.
- */
-static void qtd_list_free (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- struct list_head *qtd_list
-) {
- struct list_head *entry, *temp;
-
- list_for_each_safe (entry, temp, qtd_list) {
- struct fusbh200_qtd *qtd;
-
- qtd = list_entry (entry, struct fusbh200_qtd, qtd_list);
- list_del (&qtd->qtd_list);
- fusbh200_qtd_free (fusbh200, qtd);
- }
-}
-
-/*
- * create a list of filled qtds for this URB; won't link into qh.
- */
-static struct list_head *
-qh_urb_transaction (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- struct list_head *head,
- gfp_t flags
-) {
- struct fusbh200_qtd *qtd, *qtd_prev;
- dma_addr_t buf;
- int len, this_sg_len, maxpacket;
- int is_input;
- u32 token;
- int i;
- struct scatterlist *sg;
-
- /*
- * URBs map to sequences of QTDs: one logical transaction
- */
- qtd = fusbh200_qtd_alloc (fusbh200, flags);
- if (unlikely (!qtd))
- return NULL;
- list_add_tail (&qtd->qtd_list, head);
- qtd->urb = urb;
-
- token = QTD_STS_ACTIVE;
- token |= (FUSBH200_TUNE_CERR << 10);
- /* for split transactions, SplitXState initialized to zero */
-
- len = urb->transfer_buffer_length;
- is_input = usb_pipein (urb->pipe);
- if (usb_pipecontrol (urb->pipe)) {
- /* SETUP pid */
- qtd_fill(fusbh200, qtd, urb->setup_dma,
- sizeof (struct usb_ctrlrequest),
- token | (2 /* "setup" */ << 8), 8);
-
- /* ... and always at least one more pid */
- token ^= QTD_TOGGLE;
- qtd_prev = qtd;
- qtd = fusbh200_qtd_alloc (fusbh200, flags);
- if (unlikely (!qtd))
- goto cleanup;
- qtd->urb = urb;
- qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
- list_add_tail (&qtd->qtd_list, head);
-
- /* for zero length DATA stages, STATUS is always IN */
- if (len == 0)
- token |= (1 /* "in" */ << 8);
- }
-
- /*
- * data transfer stage: buffer setup
- */
- i = urb->num_mapped_sgs;
- if (len > 0 && i > 0) {
- sg = urb->sg;
- buf = sg_dma_address(sg);
-
- /* urb->transfer_buffer_length may be smaller than the
- * size of the scatterlist (or vice versa)
- */
- this_sg_len = min_t(int, sg_dma_len(sg), len);
- } else {
- sg = NULL;
- buf = urb->transfer_dma;
- this_sg_len = len;
- }
-
- if (is_input)
- token |= (1 /* "in" */ << 8);
- /* else it's already initted to "out" pid (0 << 8) */
-
- maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
-
- /*
- * buffer gets wrapped in one or more qtds;
- * last one may be "short" (including zero len)
- * and may serve as a control status ack
- */
- for (;;) {
- int this_qtd_len;
-
- this_qtd_len = qtd_fill(fusbh200, qtd, buf, this_sg_len, token,
- maxpacket);
- this_sg_len -= this_qtd_len;
- len -= this_qtd_len;
- buf += this_qtd_len;
-
- /*
- * short reads advance to a "magic" dummy instead of the next
- * qtd ... that forces the queue to stop, for manual cleanup.
- * (this will usually be overridden later.)
- */
- if (is_input)
- qtd->hw_alt_next = fusbh200->async->hw->hw_alt_next;
-
- /* qh makes control packets use qtd toggle; maybe switch it */
- if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
- token ^= QTD_TOGGLE;
-
- if (likely(this_sg_len <= 0)) {
- if (--i <= 0 || len <= 0)
- break;
- sg = sg_next(sg);
- buf = sg_dma_address(sg);
- this_sg_len = min_t(int, sg_dma_len(sg), len);
- }
-
- qtd_prev = qtd;
- qtd = fusbh200_qtd_alloc (fusbh200, flags);
- if (unlikely (!qtd))
- goto cleanup;
- qtd->urb = urb;
- qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
- list_add_tail (&qtd->qtd_list, head);
- }
-
- /*
- * unless the caller requires manual cleanup after short reads,
- * have the alt_next mechanism keep the queue running after the
- * last data qtd (the only one, for control and most other cases).
- */
- if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
- || usb_pipecontrol (urb->pipe)))
- qtd->hw_alt_next = FUSBH200_LIST_END(fusbh200);
-
- /*
- * control requests may need a terminating data "status" ack;
- * other OUT ones may need a terminating short packet
- * (zero length).
- */
- if (likely (urb->transfer_buffer_length != 0)) {
- int one_more = 0;
-
- if (usb_pipecontrol (urb->pipe)) {
- one_more = 1;
- token ^= 0x0100; /* "in" <--> "out" */
- token |= QTD_TOGGLE; /* force DATA1 */
- } else if (usb_pipeout(urb->pipe)
- && (urb->transfer_flags & URB_ZERO_PACKET)
- && !(urb->transfer_buffer_length % maxpacket)) {
- one_more = 1;
- }
- if (one_more) {
- qtd_prev = qtd;
- qtd = fusbh200_qtd_alloc (fusbh200, flags);
- if (unlikely (!qtd))
- goto cleanup;
- qtd->urb = urb;
- qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
- list_add_tail (&qtd->qtd_list, head);
-
- /* never any data in such packets */
- qtd_fill(fusbh200, qtd, 0, 0, token, 0);
- }
- }
-
- /* by default, enable interrupt on urb completion */
- if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT)))
- qtd->hw_token |= cpu_to_hc32(fusbh200, QTD_IOC);
- return head;
-
-cleanup:
- qtd_list_free (fusbh200, urb, head);
- return NULL;
-}
-
-/*-------------------------------------------------------------------------*/
-
-// Would be best to create all qh's from config descriptors,
-// when each interface/altsetting is established. Unlink
-// any previous qh and cancel its urbs first; endpoints are
-// implicitly reset then (data toggle too).
-// That'd mean updating how usbcore talks to HCDs. (2.7?)
-
-
-/*
- * Each QH holds a qtd list; a QH is used for everything except iso.
- *
- * For interrupt urbs, the scheduler must set the microframe scheduling
- * mask(s) each time the QH gets scheduled. For highspeed, that's
- * just one microframe in the s-mask. For split interrupt transactions
- * there are additional complications: c-mask, maybe FSTNs.
- */
-static struct fusbh200_qh *
-qh_make (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- gfp_t flags
-) {
- struct fusbh200_qh *qh = fusbh200_qh_alloc (fusbh200, flags);
- u32 info1 = 0, info2 = 0;
- int is_input, type;
- int maxp = 0;
- struct usb_tt *tt = urb->dev->tt;
- struct fusbh200_qh_hw *hw;
-
- if (!qh)
- return qh;
-
- /*
- * init endpoint/device data for this QH
- */
- info1 |= usb_pipeendpoint (urb->pipe) << 8;
- info1 |= usb_pipedevice (urb->pipe) << 0;
-
- is_input = usb_pipein (urb->pipe);
- type = usb_pipetype (urb->pipe);
- maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input);
-
- /* 1024 byte maxpacket is a hardware ceiling. High bandwidth
- * acts like up to 3KB, but is built from smaller packets.
- */
- if (max_packet(maxp) > 1024) {
- fusbh200_dbg(fusbh200, "bogus qh maxpacket %d\n", max_packet(maxp));
- goto done;
- }
-
- /* Compute interrupt scheduling parameters just once, and save.
- * - allowing for high bandwidth, how many nsec/uframe are used?
- * - split transactions need a second CSPLIT uframe; same question
- * - splits also need a schedule gap (for full/low speed I/O)
- * - qh has a polling interval
- *
- * For control/bulk requests, the HC or TT handles these.
- */
- if (type == PIPE_INTERRUPT) {
- qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
- is_input, 0,
- hb_mult(maxp) * max_packet(maxp)));
- qh->start = NO_FRAME;
-
- if (urb->dev->speed == USB_SPEED_HIGH) {
- qh->c_usecs = 0;
- qh->gap_uf = 0;
-
- qh->period = urb->interval >> 3;
- if (qh->period == 0 && urb->interval != 1) {
- /* NOTE interval 2 or 4 uframes could work.
- * But interval 1 scheduling is simpler, and
- * includes high bandwidth.
- */
- urb->interval = 1;
- } else if (qh->period > fusbh200->periodic_size) {
- qh->period = fusbh200->periodic_size;
- urb->interval = qh->period << 3;
- }
- } else {
- int think_time;
-
- /* gap is f(FS/LS transfer times) */
- qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed,
- is_input, 0, maxp) / (125 * 1000);
-
- /* FIXME this just approximates SPLIT/CSPLIT times */
- if (is_input) { // SPLIT, gap, CSPLIT+DATA
- qh->c_usecs = qh->usecs + HS_USECS (0);
- qh->usecs = HS_USECS (1);
- } else { // SPLIT+DATA, gap, CSPLIT
- qh->usecs += HS_USECS (1);
- qh->c_usecs = HS_USECS (0);
- }
-
- think_time = tt ? tt->think_time : 0;
- qh->tt_usecs = NS_TO_US (think_time +
- usb_calc_bus_time (urb->dev->speed,
- is_input, 0, max_packet (maxp)));
- qh->period = urb->interval;
- if (qh->period > fusbh200->periodic_size) {
- qh->period = fusbh200->periodic_size;
- urb->interval = qh->period;
- }
- }
- }
-
- /* support for tt scheduling, and access to toggles */
- qh->dev = urb->dev;
-
- /* using TT? */
- switch (urb->dev->speed) {
- case USB_SPEED_LOW:
- info1 |= QH_LOW_SPEED;
- /* FALL THROUGH */
-
- case USB_SPEED_FULL:
- /* EPS 0 means "full" */
- if (type != PIPE_INTERRUPT)
- info1 |= (FUSBH200_TUNE_RL_TT << 28);
- if (type == PIPE_CONTROL) {
- info1 |= QH_CONTROL_EP; /* for TT */
- info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
- }
- info1 |= maxp << 16;
-
- info2 |= (FUSBH200_TUNE_MULT_TT << 30);
-
- /* Some Freescale processors have an erratum in which the
- * port number in the queue head was 0..N-1 instead of 1..N.
- */
- if (fusbh200_has_fsl_portno_bug(fusbh200))
- info2 |= (urb->dev->ttport-1) << 23;
- else
- info2 |= urb->dev->ttport << 23;
-
- /* set the address of the TT; for TDI's integrated
- * root hub tt, leave it zeroed.
- */
- if (tt && tt->hub != fusbh200_to_hcd(fusbh200)->self.root_hub)
- info2 |= tt->hub->devnum << 16;
-
- /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
-
- break;
-
- case USB_SPEED_HIGH: /* no TT involved */
- info1 |= QH_HIGH_SPEED;
- if (type == PIPE_CONTROL) {
- info1 |= (FUSBH200_TUNE_RL_HS << 28);
- info1 |= 64 << 16; /* usb2 fixed maxpacket */
- info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
- info2 |= (FUSBH200_TUNE_MULT_HS << 30);
- } else if (type == PIPE_BULK) {
- info1 |= (FUSBH200_TUNE_RL_HS << 28);
- /* The USB spec says that high speed bulk endpoints
- * always use 512 byte maxpacket. But some device
- * vendors decided to ignore that, and MSFT is happy
- * to help them do so. So now people expect to use
- * such nonconformant devices with Linux too; sigh.
- */
- info1 |= max_packet(maxp) << 16;
- info2 |= (FUSBH200_TUNE_MULT_HS << 30);
- } else { /* PIPE_INTERRUPT */
- info1 |= max_packet (maxp) << 16;
- info2 |= hb_mult (maxp) << 30;
- }
- break;
- default:
- fusbh200_dbg(fusbh200, "bogus dev %p speed %d\n", urb->dev,
- urb->dev->speed);
-done:
- qh_destroy(fusbh200, qh);
- return NULL;
- }
-
- /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
-
- /* init as live, toggle clear, advance to dummy */
- qh->qh_state = QH_STATE_IDLE;
- hw = qh->hw;
- hw->hw_info1 = cpu_to_hc32(fusbh200, info1);
- hw->hw_info2 = cpu_to_hc32(fusbh200, info2);
- qh->is_out = !is_input;
- usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
- qh_refresh (fusbh200, qh);
- return qh;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void enable_async(struct fusbh200_hcd *fusbh200)
-{
- if (fusbh200->async_count++)
- return;
-
- /* Stop waiting to turn off the async schedule */
- fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_DISABLE_ASYNC);
-
- /* Don't start the schedule until ASS is 0 */
- fusbh200_poll_ASS(fusbh200);
- turn_on_io_watchdog(fusbh200);
-}
-
-static void disable_async(struct fusbh200_hcd *fusbh200)
-{
- if (--fusbh200->async_count)
- return;
-
- /* The async schedule and async_unlink list are supposed to be empty */
- WARN_ON(fusbh200->async->qh_next.qh || fusbh200->async_unlink);
-
- /* Don't turn off the schedule until ASS is 1 */
- fusbh200_poll_ASS(fusbh200);
-}
-
-/* move qh (and its qtds) onto async queue; maybe enable queue. */
-
-static void qh_link_async (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- __hc32 dma = QH_NEXT(fusbh200, qh->qh_dma);
- struct fusbh200_qh *head;
-
- /* Don't link a QH if there's a Clear-TT-Buffer pending */
- if (unlikely(qh->clearing_tt))
- return;
-
- WARN_ON(qh->qh_state != QH_STATE_IDLE);
-
- /* clear halt and/or toggle; and maybe recover from silicon quirk */
- qh_refresh(fusbh200, qh);
-
- /* splice right after start */
- head = fusbh200->async;
- qh->qh_next = head->qh_next;
- qh->hw->hw_next = head->hw->hw_next;
- wmb ();
-
- head->qh_next.qh = qh;
- head->hw->hw_next = dma;
-
- qh->xacterrs = 0;
- qh->qh_state = QH_STATE_LINKED;
- /* qtd completions reported later by interrupt */
-
- enable_async(fusbh200);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * For control/bulk/interrupt, return QH with these TDs appended.
- * Allocates and initializes the QH if necessary.
- * Returns null if it can't allocate a QH it needs to.
- * If the QH has TDs (urbs) already, that's great.
- */
-static struct fusbh200_qh *qh_append_tds (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- struct list_head *qtd_list,
- int epnum,
- void **ptr
-)
-{
- struct fusbh200_qh *qh = NULL;
- __hc32 qh_addr_mask = cpu_to_hc32(fusbh200, 0x7f);
-
- qh = (struct fusbh200_qh *) *ptr;
- if (unlikely (qh == NULL)) {
- /* can't sleep here, we have fusbh200->lock... */
- qh = qh_make (fusbh200, urb, GFP_ATOMIC);
- *ptr = qh;
- }
- if (likely (qh != NULL)) {
- struct fusbh200_qtd *qtd;
-
- if (unlikely (list_empty (qtd_list)))
- qtd = NULL;
- else
- qtd = list_entry (qtd_list->next, struct fusbh200_qtd,
- qtd_list);
-
- /* control qh may need patching ... */
- if (unlikely (epnum == 0)) {
-
- /* usb_reset_device() briefly reverts to address 0 */
- if (usb_pipedevice (urb->pipe) == 0)
- qh->hw->hw_info1 &= ~qh_addr_mask;
- }
-
- /* just one way to queue requests: swap with the dummy qtd.
- * only hc or qh_refresh() ever modify the overlay.
- */
- if (likely (qtd != NULL)) {
- struct fusbh200_qtd *dummy;
- dma_addr_t dma;
- __hc32 token;
-
- /* to avoid racing the HC, use the dummy td instead of
- * the first td of our list (becomes new dummy). both
- * tds stay deactivated until we're done, when the
- * HC is allowed to fetch the old dummy (4.10.2).
- */
- token = qtd->hw_token;
- qtd->hw_token = HALT_BIT(fusbh200);
-
- dummy = qh->dummy;
-
- dma = dummy->qtd_dma;
- *dummy = *qtd;
- dummy->qtd_dma = dma;
-
- list_del (&qtd->qtd_list);
- list_add (&dummy->qtd_list, qtd_list);
- list_splice_tail(qtd_list, &qh->qtd_list);
-
- fusbh200_qtd_init(fusbh200, qtd, qtd->qtd_dma);
- qh->dummy = qtd;
-
- /* hc must see the new dummy at list end */
- dma = qtd->qtd_dma;
- qtd = list_entry (qh->qtd_list.prev,
- struct fusbh200_qtd, qtd_list);
- qtd->hw_next = QTD_NEXT(fusbh200, dma);
-
- /* let the hc process these next qtds */
- wmb ();
- dummy->hw_token = token;
-
- urb->hcpriv = qh;
- }
- }
- return qh;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int
-submit_async (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- struct list_head *qtd_list,
- gfp_t mem_flags
-) {
- int epnum;
- unsigned long flags;
- struct fusbh200_qh *qh = NULL;
- int rc;
-
- epnum = urb->ep->desc.bEndpointAddress;
-
-#ifdef FUSBH200_URB_TRACE
- {
- struct fusbh200_qtd *qtd;
- qtd = list_entry(qtd_list->next, struct fusbh200_qtd, qtd_list);
- fusbh200_dbg(fusbh200,
- "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
- __func__, urb->dev->devpath, urb,
- epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
- urb->transfer_buffer_length,
- qtd, urb->ep->hcpriv);
- }
-#endif
-
- spin_lock_irqsave (&fusbh200->lock, flags);
- if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
- rc = -ESHUTDOWN;
- goto done;
- }
- rc = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
- if (unlikely(rc))
- goto done;
-
- qh = qh_append_tds(fusbh200, urb, qtd_list, epnum, &urb->ep->hcpriv);
- if (unlikely(qh == NULL)) {
- usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
- rc = -ENOMEM;
- goto done;
- }
-
- /* Control/bulk operations through TTs don't need scheduling,
- * the HC and TT handle it when the TT has a buffer ready.
- */
- if (likely (qh->qh_state == QH_STATE_IDLE))
- qh_link_async(fusbh200, qh);
- done:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- if (unlikely (qh == NULL))
- qtd_list_free (fusbh200, urb, qtd_list);
- return rc;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void single_unlink_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- struct fusbh200_qh *prev;
-
- /* Add to the end of the list of QHs waiting for the next IAAD */
- qh->qh_state = QH_STATE_UNLINK;
- if (fusbh200->async_unlink)
- fusbh200->async_unlink_last->unlink_next = qh;
- else
- fusbh200->async_unlink = qh;
- fusbh200->async_unlink_last = qh;
-
- /* Unlink it from the schedule */
- prev = fusbh200->async;
- while (prev->qh_next.qh != qh)
- prev = prev->qh_next.qh;
-
- prev->hw->hw_next = qh->hw->hw_next;
- prev->qh_next = qh->qh_next;
- if (fusbh200->qh_scan_next == qh)
- fusbh200->qh_scan_next = qh->qh_next.qh;
-}
-
-static void start_iaa_cycle(struct fusbh200_hcd *fusbh200, bool nested)
-{
- /*
- * Do nothing if an IAA cycle is already running or
- * if one will be started shortly.
- */
- if (fusbh200->async_iaa || fusbh200->async_unlinking)
- return;
-
- /* Do all the waiting QHs at once */
- fusbh200->async_iaa = fusbh200->async_unlink;
- fusbh200->async_unlink = NULL;
-
- /* If the controller isn't running, we don't have to wait for it */
- if (unlikely(fusbh200->rh_state < FUSBH200_RH_RUNNING)) {
- if (!nested) /* Avoid recursion */
- end_unlink_async(fusbh200);
-
- /* Otherwise start a new IAA cycle */
- } else if (likely(fusbh200->rh_state == FUSBH200_RH_RUNNING)) {
- /* Make sure the unlinks are all visible to the hardware */
- wmb();
-
- fusbh200_writel(fusbh200, fusbh200->command | CMD_IAAD,
- &fusbh200->regs->command);
- fusbh200_readl(fusbh200, &fusbh200->regs->command);
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_IAA_WATCHDOG, true);
- }
-}
-
-/* the async qh for the qtds being unlinked are now gone from the HC */
-
-static void end_unlink_async(struct fusbh200_hcd *fusbh200)
-{
- struct fusbh200_qh *qh;
-
- /* Process the idle QHs */
- restart:
- fusbh200->async_unlinking = true;
- while (fusbh200->async_iaa) {
- qh = fusbh200->async_iaa;
- fusbh200->async_iaa = qh->unlink_next;
- qh->unlink_next = NULL;
-
- qh->qh_state = QH_STATE_IDLE;
- qh->qh_next.qh = NULL;
-
- qh_completions(fusbh200, qh);
- if (!list_empty(&qh->qtd_list) &&
- fusbh200->rh_state == FUSBH200_RH_RUNNING)
- qh_link_async(fusbh200, qh);
- disable_async(fusbh200);
- }
- fusbh200->async_unlinking = false;
-
- /* Start a new IAA cycle if any QHs are waiting for it */
- if (fusbh200->async_unlink) {
- start_iaa_cycle(fusbh200, true);
- if (unlikely(fusbh200->rh_state < FUSBH200_RH_RUNNING))
- goto restart;
- }
-}
-
-static void unlink_empty_async(struct fusbh200_hcd *fusbh200)
-{
- struct fusbh200_qh *qh, *next;
- bool stopped = (fusbh200->rh_state < FUSBH200_RH_RUNNING);
- bool check_unlinks_later = false;
-
- /* Unlink all the async QHs that have been empty for a timer cycle */
- next = fusbh200->async->qh_next.qh;
- while (next) {
- qh = next;
- next = qh->qh_next.qh;
-
- if (list_empty(&qh->qtd_list) &&
- qh->qh_state == QH_STATE_LINKED) {
- if (!stopped && qh->unlink_cycle ==
- fusbh200->async_unlink_cycle)
- check_unlinks_later = true;
- else
- single_unlink_async(fusbh200, qh);
- }
- }
-
- /* Start a new IAA cycle if any QHs are waiting for it */
- if (fusbh200->async_unlink)
- start_iaa_cycle(fusbh200, false);
-
- /* QHs that haven't been empty for long enough will be handled later */
- if (check_unlinks_later) {
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_ASYNC_UNLINKS, true);
- ++fusbh200->async_unlink_cycle;
- }
-}
-
-/* makes sure the async qh will become idle */
-/* caller must own fusbh200->lock */
-
-static void start_unlink_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- /*
- * If the QH isn't linked then there's nothing we can do
- * unless we were called during a giveback, in which case
- * qh_completions() has to deal with it.
- */
- if (qh->qh_state != QH_STATE_LINKED) {
- if (qh->qh_state == QH_STATE_COMPLETING)
- qh->needs_rescan = 1;
- return;
- }
-
- single_unlink_async(fusbh200, qh);
- start_iaa_cycle(fusbh200, false);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void scan_async (struct fusbh200_hcd *fusbh200)
-{
- struct fusbh200_qh *qh;
- bool check_unlinks_later = false;
-
- fusbh200->qh_scan_next = fusbh200->async->qh_next.qh;
- while (fusbh200->qh_scan_next) {
- qh = fusbh200->qh_scan_next;
- fusbh200->qh_scan_next = qh->qh_next.qh;
- rescan:
- /* clean any finished work for this qh */
- if (!list_empty(&qh->qtd_list)) {
- int temp;
-
- /*
- * Unlinks could happen here; completion reporting
- * drops the lock. That's why fusbh200->qh_scan_next
- * always holds the next qh to scan; if the next qh
- * gets unlinked then fusbh200->qh_scan_next is adjusted
- * in single_unlink_async().
- */
- temp = qh_completions(fusbh200, qh);
- if (qh->needs_rescan) {
- start_unlink_async(fusbh200, qh);
- } else if (list_empty(&qh->qtd_list)
- && qh->qh_state == QH_STATE_LINKED) {
- qh->unlink_cycle = fusbh200->async_unlink_cycle;
- check_unlinks_later = true;
- } else if (temp != 0)
- goto rescan;
- }
- }
-
- /*
- * Unlink empty entries, reducing DMA usage as well
- * as HCD schedule-scanning costs. Delay for any qh
- * we just scanned, there's a not-unusual case that it
- * doesn't stay idle for long.
- */
- if (check_unlinks_later && fusbh200->rh_state == FUSBH200_RH_RUNNING &&
- !(fusbh200->enabled_hrtimer_events &
- BIT(FUSBH200_HRTIMER_ASYNC_UNLINKS))) {
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_ASYNC_UNLINKS, true);
- ++fusbh200->async_unlink_cycle;
- }
-}
-/*-------------------------------------------------------------------------*/
-/*
- * EHCI scheduled transaction support: interrupt, iso, split iso
- * These are called "periodic" transactions in the EHCI spec.
- *
- * Note that for interrupt transfers, the QH/QTD manipulation is shared
- * with the "asynchronous" transaction support (control/bulk transfers).
- * The only real difference is in how interrupt transfers are scheduled.
- *
- * For ISO, we make an "iso_stream" head to serve the same role as a QH.
- * It keeps track of every ITD (or SITD) that's linked, and holds enough
- * pre-calculated schedule data to make appending to the queue be quick.
- */
-
-static int fusbh200_get_frame (struct usb_hcd *hcd);
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * periodic_next_shadow - return "next" pointer on shadow list
- * @periodic: host pointer to qh/itd
- * @tag: hardware tag for type of this record
- */
-static union fusbh200_shadow *
-periodic_next_shadow(struct fusbh200_hcd *fusbh200, union fusbh200_shadow *periodic,
- __hc32 tag)
-{
- switch (hc32_to_cpu(fusbh200, tag)) {
- case Q_TYPE_QH:
- return &periodic->qh->qh_next;
- case Q_TYPE_FSTN:
- return &periodic->fstn->fstn_next;
- default:
- return &periodic->itd->itd_next;
- }
-}
-
-static __hc32 *
-shadow_next_periodic(struct fusbh200_hcd *fusbh200, union fusbh200_shadow *periodic,
- __hc32 tag)
-{
- switch (hc32_to_cpu(fusbh200, tag)) {
- /* our fusbh200_shadow.qh is actually software part */
- case Q_TYPE_QH:
- return &periodic->qh->hw->hw_next;
- /* others are hw parts */
- default:
- return periodic->hw_next;
- }
-}
-
-/* caller must hold fusbh200->lock */
-static void periodic_unlink (struct fusbh200_hcd *fusbh200, unsigned frame, void *ptr)
-{
- union fusbh200_shadow *prev_p = &fusbh200->pshadow[frame];
- __hc32 *hw_p = &fusbh200->periodic[frame];
- union fusbh200_shadow here = *prev_p;
-
- /* find predecessor of "ptr"; hw and shadow lists are in sync */
- while (here.ptr && here.ptr != ptr) {
- prev_p = periodic_next_shadow(fusbh200, prev_p,
- Q_NEXT_TYPE(fusbh200, *hw_p));
- hw_p = shadow_next_periodic(fusbh200, &here,
- Q_NEXT_TYPE(fusbh200, *hw_p));
- here = *prev_p;
- }
- /* an interrupt entry (at list end) could have been shared */
- if (!here.ptr)
- return;
-
- /* update shadow and hardware lists ... the old "next" pointers
- * from ptr may still be in use, the caller updates them.
- */
- *prev_p = *periodic_next_shadow(fusbh200, &here,
- Q_NEXT_TYPE(fusbh200, *hw_p));
-
- *hw_p = *shadow_next_periodic(fusbh200, &here,
- Q_NEXT_TYPE(fusbh200, *hw_p));
-}
-
-/* how many of the uframe's 125 usecs are allocated? */
-static unsigned short
-periodic_usecs (struct fusbh200_hcd *fusbh200, unsigned frame, unsigned uframe)
-{
- __hc32 *hw_p = &fusbh200->periodic [frame];
- union fusbh200_shadow *q = &fusbh200->pshadow [frame];
- unsigned usecs = 0;
- struct fusbh200_qh_hw *hw;
-
- while (q->ptr) {
- switch (hc32_to_cpu(fusbh200, Q_NEXT_TYPE(fusbh200, *hw_p))) {
- case Q_TYPE_QH:
- hw = q->qh->hw;
- /* is it in the S-mask? */
- if (hw->hw_info2 & cpu_to_hc32(fusbh200, 1 << uframe))
- usecs += q->qh->usecs;
- /* ... or C-mask? */
- if (hw->hw_info2 & cpu_to_hc32(fusbh200,
- 1 << (8 + uframe)))
- usecs += q->qh->c_usecs;
- hw_p = &hw->hw_next;
- q = &q->qh->qh_next;
- break;
- // case Q_TYPE_FSTN:
- default:
- /* for "save place" FSTNs, count the relevant INTR
- * bandwidth from the previous frame
- */
- if (q->fstn->hw_prev != FUSBH200_LIST_END(fusbh200)) {
- fusbh200_dbg (fusbh200, "ignoring FSTN cost ...\n");
- }
- hw_p = &q->fstn->hw_next;
- q = &q->fstn->fstn_next;
- break;
- case Q_TYPE_ITD:
- if (q->itd->hw_transaction[uframe])
- usecs += q->itd->stream->usecs;
- hw_p = &q->itd->hw_next;
- q = &q->itd->itd_next;
- break;
- }
- }
- if (usecs > fusbh200->uframe_periodic_max)
- fusbh200_err (fusbh200, "uframe %d sched overrun: %d usecs\n",
- frame * 8 + uframe, usecs);
- return usecs;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int same_tt (struct usb_device *dev1, struct usb_device *dev2)
-{
- if (!dev1->tt || !dev2->tt)
- return 0;
- if (dev1->tt != dev2->tt)
- return 0;
- if (dev1->tt->multi)
- return dev1->ttport == dev2->ttport;
- else
- return 1;
-}
-
-/* return true iff the device's transaction translator is available
- * for a periodic transfer starting at the specified frame, using
- * all the uframes in the mask.
- */
-static int tt_no_collision (
- struct fusbh200_hcd *fusbh200,
- unsigned period,
- struct usb_device *dev,
- unsigned frame,
- u32 uf_mask
-)
-{
- if (period == 0) /* error */
- return 0;
-
- /* note bandwidth wastage: split never follows csplit
- * (different dev or endpoint) until the next uframe.
- * calling convention doesn't make that distinction.
- */
- for (; frame < fusbh200->periodic_size; frame += period) {
- union fusbh200_shadow here;
- __hc32 type;
- struct fusbh200_qh_hw *hw;
-
- here = fusbh200->pshadow [frame];
- type = Q_NEXT_TYPE(fusbh200, fusbh200->periodic [frame]);
- while (here.ptr) {
- switch (hc32_to_cpu(fusbh200, type)) {
- case Q_TYPE_ITD:
- type = Q_NEXT_TYPE(fusbh200, here.itd->hw_next);
- here = here.itd->itd_next;
- continue;
- case Q_TYPE_QH:
- hw = here.qh->hw;
- if (same_tt (dev, here.qh->dev)) {
- u32 mask;
-
- mask = hc32_to_cpu(fusbh200,
- hw->hw_info2);
- /* "knows" no gap is needed */
- mask |= mask >> 8;
- if (mask & uf_mask)
- break;
- }
- type = Q_NEXT_TYPE(fusbh200, hw->hw_next);
- here = here.qh->qh_next;
- continue;
- // case Q_TYPE_FSTN:
- default:
- fusbh200_dbg (fusbh200,
- "periodic frame %d bogus type %d\n",
- frame, type);
- }
-
- /* collision or error */
- return 0;
- }
- }
-
- /* no collision */
- return 1;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void enable_periodic(struct fusbh200_hcd *fusbh200)
-{
- if (fusbh200->periodic_count++)
- return;
-
- /* Stop waiting to turn off the periodic schedule */
- fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_DISABLE_PERIODIC);
-
- /* Don't start the schedule until PSS is 0 */
- fusbh200_poll_PSS(fusbh200);
- turn_on_io_watchdog(fusbh200);
-}
-
-static void disable_periodic(struct fusbh200_hcd *fusbh200)
-{
- if (--fusbh200->periodic_count)
- return;
-
- /* Don't turn off the schedule until PSS is 1 */
- fusbh200_poll_PSS(fusbh200);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* periodic schedule slots have iso tds (normal or split) first, then a
- * sparse tree for active interrupt transfers.
- *
- * this just links in a qh; caller guarantees uframe masks are set right.
- * no FSTN support (yet; fusbh200 0.96+)
- */
-static void qh_link_periodic(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- unsigned i;
- unsigned period = qh->period;
-
- dev_dbg (&qh->dev->dev,
- "link qh%d-%04x/%p start %d [%d/%d us]\n",
- period, hc32_to_cpup(fusbh200, &qh->hw->hw_info2)
- & (QH_CMASK | QH_SMASK),
- qh, qh->start, qh->usecs, qh->c_usecs);
-
- /* high bandwidth, or otherwise every microframe */
- if (period == 0)
- period = 1;
-
- for (i = qh->start; i < fusbh200->periodic_size; i += period) {
- union fusbh200_shadow *prev = &fusbh200->pshadow[i];
- __hc32 *hw_p = &fusbh200->periodic[i];
- union fusbh200_shadow here = *prev;
- __hc32 type = 0;
-
- /* skip the iso nodes at list head */
- while (here.ptr) {
- type = Q_NEXT_TYPE(fusbh200, *hw_p);
- if (type == cpu_to_hc32(fusbh200, Q_TYPE_QH))
- break;
- prev = periodic_next_shadow(fusbh200, prev, type);
- hw_p = shadow_next_periodic(fusbh200, &here, type);
- here = *prev;
- }
-
- /* sorting each branch by period (slow-->fast)
- * enables sharing interior tree nodes
- */
- while (here.ptr && qh != here.qh) {
- if (qh->period > here.qh->period)
- break;
- prev = &here.qh->qh_next;
- hw_p = &here.qh->hw->hw_next;
- here = *prev;
- }
- /* link in this qh, unless some earlier pass did that */
- if (qh != here.qh) {
- qh->qh_next = here;
- if (here.qh)
- qh->hw->hw_next = *hw_p;
- wmb ();
- prev->qh = qh;
- *hw_p = QH_NEXT (fusbh200, qh->qh_dma);
- }
- }
- qh->qh_state = QH_STATE_LINKED;
- qh->xacterrs = 0;
-
- /* update per-qh bandwidth for usbfs */
- fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated += qh->period
- ? ((qh->usecs + qh->c_usecs) / qh->period)
- : (qh->usecs * 8);
-
- list_add(&qh->intr_node, &fusbh200->intr_qh_list);
-
- /* maybe enable periodic schedule processing */
- ++fusbh200->intr_count;
- enable_periodic(fusbh200);
-}
-
-static void qh_unlink_periodic(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- unsigned i;
- unsigned period;
-
- /*
- * If qh is for a low/full-speed device, simply unlinking it
- * could interfere with an ongoing split transaction. To unlink
- * it safely would require setting the QH_INACTIVATE bit and
- * waiting at least one frame, as described in EHCI 4.12.2.5.
- *
- * We won't bother with any of this. Instead, we assume that the
- * only reason for unlinking an interrupt QH while the current URB
- * is still active is to dequeue all the URBs (flush the whole
- * endpoint queue).
- *
- * If rebalancing the periodic schedule is ever implemented, this
- * approach will no longer be valid.
- */
-
- /* high bandwidth, or otherwise part of every microframe */
- if ((period = qh->period) == 0)
- period = 1;
-
- for (i = qh->start; i < fusbh200->periodic_size; i += period)
- periodic_unlink (fusbh200, i, qh);
-
- /* update per-qh bandwidth for usbfs */
- fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated -= qh->period
- ? ((qh->usecs + qh->c_usecs) / qh->period)
- : (qh->usecs * 8);
-
- dev_dbg (&qh->dev->dev,
- "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
- qh->period,
- hc32_to_cpup(fusbh200, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
- qh, qh->start, qh->usecs, qh->c_usecs);
-
- /* qh->qh_next still "live" to HC */
- qh->qh_state = QH_STATE_UNLINK;
- qh->qh_next.ptr = NULL;
-
- if (fusbh200->qh_scan_next == qh)
- fusbh200->qh_scan_next = list_entry(qh->intr_node.next,
- struct fusbh200_qh, intr_node);
- list_del(&qh->intr_node);
-}
-
-static void start_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- /* If the QH isn't linked then there's nothing we can do
- * unless we were called during a giveback, in which case
- * qh_completions() has to deal with it.
- */
- if (qh->qh_state != QH_STATE_LINKED) {
- if (qh->qh_state == QH_STATE_COMPLETING)
- qh->needs_rescan = 1;
- return;
- }
-
- qh_unlink_periodic (fusbh200, qh);
-
- /* Make sure the unlinks are visible before starting the timer */
- wmb();
-
- /*
- * The EHCI spec doesn't say how long it takes the controller to
- * stop accessing an unlinked interrupt QH. The timer delay is
- * 9 uframes; presumably that will be long enough.
- */
- qh->unlink_cycle = fusbh200->intr_unlink_cycle;
-
- /* New entries go at the end of the intr_unlink list */
- if (fusbh200->intr_unlink)
- fusbh200->intr_unlink_last->unlink_next = qh;
- else
- fusbh200->intr_unlink = qh;
- fusbh200->intr_unlink_last = qh;
-
- if (fusbh200->intr_unlinking)
- ; /* Avoid recursive calls */
- else if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
- fusbh200_handle_intr_unlinks(fusbh200);
- else if (fusbh200->intr_unlink == qh) {
- fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_UNLINK_INTR, true);
- ++fusbh200->intr_unlink_cycle;
- }
-}
-
-static void end_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- struct fusbh200_qh_hw *hw = qh->hw;
- int rc;
-
- qh->qh_state = QH_STATE_IDLE;
- hw->hw_next = FUSBH200_LIST_END(fusbh200);
-
- qh_completions(fusbh200, qh);
-
- /* reschedule QH iff another request is queued */
- if (!list_empty(&qh->qtd_list) && fusbh200->rh_state == FUSBH200_RH_RUNNING) {
- rc = qh_schedule(fusbh200, qh);
-
- /* An error here likely indicates handshake failure
- * or no space left in the schedule. Neither fault
- * should happen often ...
- *
- * FIXME kill the now-dysfunctional queued urbs
- */
- if (rc != 0)
- fusbh200_err(fusbh200, "can't reschedule qh %p, err %d\n",
- qh, rc);
- }
-
- /* maybe turn off periodic schedule */
- --fusbh200->intr_count;
- disable_periodic(fusbh200);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int check_period (
- struct fusbh200_hcd *fusbh200,
- unsigned frame,
- unsigned uframe,
- unsigned period,
- unsigned usecs
-) {
- int claimed;
-
- /* complete split running into next frame?
- * given FSTN support, we could sometimes check...
- */
- if (uframe >= 8)
- return 0;
-
- /* convert "usecs we need" to "max already claimed" */
- usecs = fusbh200->uframe_periodic_max - usecs;
-
- /* we "know" 2 and 4 uframe intervals were rejected; so
- * for period 0, check _every_ microframe in the schedule.
- */
- if (unlikely (period == 0)) {
- do {
- for (uframe = 0; uframe < 7; uframe++) {
- claimed = periodic_usecs (fusbh200, frame, uframe);
- if (claimed > usecs)
- return 0;
- }
- } while ((frame += 1) < fusbh200->periodic_size);
-
- /* just check the specified uframe, at that period */
- } else {
- do {
- claimed = periodic_usecs (fusbh200, frame, uframe);
- if (claimed > usecs)
- return 0;
- } while ((frame += period) < fusbh200->periodic_size);
- }
-
- // success!
- return 1;
-}
-
-static int check_intr_schedule (
- struct fusbh200_hcd *fusbh200,
- unsigned frame,
- unsigned uframe,
- const struct fusbh200_qh *qh,
- __hc32 *c_maskp
-)
-{
- int retval = -ENOSPC;
- u8 mask = 0;
-
- if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
- goto done;
-
- if (!check_period (fusbh200, frame, uframe, qh->period, qh->usecs))
- goto done;
- if (!qh->c_usecs) {
- retval = 0;
- *c_maskp = 0;
- goto done;
- }
-
- /* Make sure this tt's buffer is also available for CSPLITs.
- * We pessimize a bit; probably the typical full speed case
- * doesn't need the second CSPLIT.
- *
- * NOTE: both SPLIT and CSPLIT could be checked in just
- * one smart pass...
- */
- mask = 0x03 << (uframe + qh->gap_uf);
- *c_maskp = cpu_to_hc32(fusbh200, mask << 8);
-
- mask |= 1 << uframe;
- if (tt_no_collision (fusbh200, qh->period, qh->dev, frame, mask)) {
- if (!check_period (fusbh200, frame, uframe + qh->gap_uf + 1,
- qh->period, qh->c_usecs))
- goto done;
- if (!check_period (fusbh200, frame, uframe + qh->gap_uf,
- qh->period, qh->c_usecs))
- goto done;
- retval = 0;
- }
-done:
- return retval;
-}
-
-/* "first fit" scheduling policy used the first time through,
- * or when the previous schedule slot can't be re-used.
- */
-static int qh_schedule(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
-{
- int status;
- unsigned uframe;
- __hc32 c_mask;
- unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
- struct fusbh200_qh_hw *hw = qh->hw;
-
- qh_refresh(fusbh200, qh);
- hw->hw_next = FUSBH200_LIST_END(fusbh200);
- frame = qh->start;
-
- /* reuse the previous schedule slots, if we can */
- if (frame < qh->period) {
- uframe = ffs(hc32_to_cpup(fusbh200, &hw->hw_info2) & QH_SMASK);
- status = check_intr_schedule (fusbh200, frame, --uframe,
- qh, &c_mask);
- } else {
- uframe = 0;
- c_mask = 0;
- status = -ENOSPC;
- }
-
- /* else scan the schedule to find a group of slots such that all
- * uframes have enough periodic bandwidth available.
- */
- if (status) {
- /* "normal" case, uframing flexible except with splits */
- if (qh->period) {
- int i;
-
- for (i = qh->period; status && i > 0; --i) {
- frame = ++fusbh200->random_frame % qh->period;
- for (uframe = 0; uframe < 8; uframe++) {
- status = check_intr_schedule (fusbh200,
- frame, uframe, qh,
- &c_mask);
- if (status == 0)
- break;
- }
- }
-
- /* qh->period == 0 means every uframe */
- } else {
- frame = 0;
- status = check_intr_schedule (fusbh200, 0, 0, qh, &c_mask);
- }
- if (status)
- goto done;
- qh->start = frame;
-
- /* reset S-frame and (maybe) C-frame masks */
- hw->hw_info2 &= cpu_to_hc32(fusbh200, ~(QH_CMASK | QH_SMASK));
- hw->hw_info2 |= qh->period
- ? cpu_to_hc32(fusbh200, 1 << uframe)
- : cpu_to_hc32(fusbh200, QH_SMASK);
- hw->hw_info2 |= c_mask;
- } else
- fusbh200_dbg (fusbh200, "reused qh %p schedule\n", qh);
-
- /* stuff into the periodic schedule */
- qh_link_periodic(fusbh200, qh);
-done:
- return status;
-}
-
-static int intr_submit (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- struct list_head *qtd_list,
- gfp_t mem_flags
-) {
- unsigned epnum;
- unsigned long flags;
- struct fusbh200_qh *qh;
- int status;
- struct list_head empty;
-
- /* get endpoint and transfer/schedule data */
- epnum = urb->ep->desc.bEndpointAddress;
-
- spin_lock_irqsave (&fusbh200->lock, flags);
-
- if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
- status = -ESHUTDOWN;
- goto done_not_linked;
- }
- status = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
- if (unlikely(status))
- goto done_not_linked;
-
- /* get qh and force any scheduling errors */
- INIT_LIST_HEAD (&empty);
- qh = qh_append_tds(fusbh200, urb, &empty, epnum, &urb->ep->hcpriv);
- if (qh == NULL) {
- status = -ENOMEM;
- goto done;
- }
- if (qh->qh_state == QH_STATE_IDLE) {
- if ((status = qh_schedule (fusbh200, qh)) != 0)
- goto done;
- }
-
- /* then queue the urb's tds to the qh */
- qh = qh_append_tds(fusbh200, urb, qtd_list, epnum, &urb->ep->hcpriv);
- BUG_ON (qh == NULL);
-
- /* ... update usbfs periodic stats */
- fusbh200_to_hcd(fusbh200)->self.bandwidth_int_reqs++;
-
-done:
- if (unlikely(status))
- usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
-done_not_linked:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- if (status)
- qtd_list_free (fusbh200, urb, qtd_list);
-
- return status;
-}
-
-static void scan_intr(struct fusbh200_hcd *fusbh200)
-{
- struct fusbh200_qh *qh;
-
- list_for_each_entry_safe(qh, fusbh200->qh_scan_next, &fusbh200->intr_qh_list,
- intr_node) {
- rescan:
- /* clean any finished work for this qh */
- if (!list_empty(&qh->qtd_list)) {
- int temp;
-
- /*
- * Unlinks could happen here; completion reporting
- * drops the lock. That's why fusbh200->qh_scan_next
- * always holds the next qh to scan; if the next qh
- * gets unlinked then fusbh200->qh_scan_next is adjusted
- * in qh_unlink_periodic().
- */
- temp = qh_completions(fusbh200, qh);
- if (unlikely(qh->needs_rescan ||
- (list_empty(&qh->qtd_list) &&
- qh->qh_state == QH_STATE_LINKED)))
- start_unlink_intr(fusbh200, qh);
- else if (temp != 0)
- goto rescan;
- }
- }
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* fusbh200_iso_stream ops work with both ITD and SITD */
-
-static struct fusbh200_iso_stream *
-iso_stream_alloc (gfp_t mem_flags)
-{
- struct fusbh200_iso_stream *stream;
-
- stream = kzalloc(sizeof *stream, mem_flags);
- if (likely (stream != NULL)) {
- INIT_LIST_HEAD(&stream->td_list);
- INIT_LIST_HEAD(&stream->free_list);
- stream->next_uframe = -1;
- }
- return stream;
-}
-
-static void
-iso_stream_init (
- struct fusbh200_hcd *fusbh200,
- struct fusbh200_iso_stream *stream,
- struct usb_device *dev,
- int pipe,
- unsigned interval
-)
-{
- u32 buf1;
- unsigned epnum, maxp;
- int is_input;
- long bandwidth;
- unsigned multi;
-
- /*
- * this might be a "high bandwidth" highspeed endpoint,
- * as encoded in the ep descriptor's wMaxPacket field
- */
- epnum = usb_pipeendpoint (pipe);
- is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
- maxp = usb_maxpacket(dev, pipe, !is_input);
- if (is_input) {
- buf1 = (1 << 11);
- } else {
- buf1 = 0;
- }
-
- maxp = max_packet(maxp);
- multi = hb_mult(maxp);
- buf1 |= maxp;
- maxp *= multi;
-
- stream->buf0 = cpu_to_hc32(fusbh200, (epnum << 8) | dev->devnum);
- stream->buf1 = cpu_to_hc32(fusbh200, buf1);
- stream->buf2 = cpu_to_hc32(fusbh200, multi);
-
- /* usbfs wants to report the average usecs per frame tied up
- * when transfers on this endpoint are scheduled ...
- */
- if (dev->speed == USB_SPEED_FULL) {
- interval <<= 3;
- stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed,
- is_input, 1, maxp));
- stream->usecs /= 8;
- } else {
- stream->highspeed = 1;
- stream->usecs = HS_USECS_ISO (maxp);
- }
- bandwidth = stream->usecs * 8;
- bandwidth /= interval;
-
- stream->bandwidth = bandwidth;
- stream->udev = dev;
- stream->bEndpointAddress = is_input | epnum;
- stream->interval = interval;
- stream->maxp = maxp;
-}
-
-static struct fusbh200_iso_stream *
-iso_stream_find (struct fusbh200_hcd *fusbh200, struct urb *urb)
-{
- unsigned epnum;
- struct fusbh200_iso_stream *stream;
- struct usb_host_endpoint *ep;
- unsigned long flags;
-
- epnum = usb_pipeendpoint (urb->pipe);
- if (usb_pipein(urb->pipe))
- ep = urb->dev->ep_in[epnum];
- else
- ep = urb->dev->ep_out[epnum];
-
- spin_lock_irqsave (&fusbh200->lock, flags);
- stream = ep->hcpriv;
-
- if (unlikely (stream == NULL)) {
- stream = iso_stream_alloc(GFP_ATOMIC);
- if (likely (stream != NULL)) {
- ep->hcpriv = stream;
- stream->ep = ep;
- iso_stream_init(fusbh200, stream, urb->dev, urb->pipe,
- urb->interval);
- }
-
- /* if dev->ep [epnum] is a QH, hw is set */
- } else if (unlikely (stream->hw != NULL)) {
- fusbh200_dbg (fusbh200, "dev %s ep%d%s, not iso??\n",
- urb->dev->devpath, epnum,
- usb_pipein(urb->pipe) ? "in" : "out");
- stream = NULL;
- }
-
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- return stream;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* fusbh200_iso_sched ops can be ITD-only or SITD-only */
-
-static struct fusbh200_iso_sched *
-iso_sched_alloc (unsigned packets, gfp_t mem_flags)
-{
- struct fusbh200_iso_sched *iso_sched;
- int size = sizeof *iso_sched;
-
- size += packets * sizeof (struct fusbh200_iso_packet);
- iso_sched = kzalloc(size, mem_flags);
- if (likely (iso_sched != NULL)) {
- INIT_LIST_HEAD (&iso_sched->td_list);
- }
- return iso_sched;
-}
-
-static inline void
-itd_sched_init(
- struct fusbh200_hcd *fusbh200,
- struct fusbh200_iso_sched *iso_sched,
- struct fusbh200_iso_stream *stream,
- struct urb *urb
-)
-{
- unsigned i;
- dma_addr_t dma = urb->transfer_dma;
-
- /* how many uframes are needed for these transfers */
- iso_sched->span = urb->number_of_packets * stream->interval;
-
- /* figure out per-uframe itd fields that we'll need later
- * when we fit new itds into the schedule.
- */
- for (i = 0; i < urb->number_of_packets; i++) {
- struct fusbh200_iso_packet *uframe = &iso_sched->packet [i];
- unsigned length;
- dma_addr_t buf;
- u32 trans;
-
- length = urb->iso_frame_desc [i].length;
- buf = dma + urb->iso_frame_desc [i].offset;
-
- trans = FUSBH200_ISOC_ACTIVE;
- trans |= buf & 0x0fff;
- if (unlikely (((i + 1) == urb->number_of_packets))
- && !(urb->transfer_flags & URB_NO_INTERRUPT))
- trans |= FUSBH200_ITD_IOC;
- trans |= length << 16;
- uframe->transaction = cpu_to_hc32(fusbh200, trans);
-
- /* might need to cross a buffer page within a uframe */
- uframe->bufp = (buf & ~(u64)0x0fff);
- buf += length;
- if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff))))
- uframe->cross = 1;
- }
-}
-
-static void
-iso_sched_free (
- struct fusbh200_iso_stream *stream,
- struct fusbh200_iso_sched *iso_sched
-)
-{
- if (!iso_sched)
- return;
- // caller must hold fusbh200->lock!
- list_splice (&iso_sched->td_list, &stream->free_list);
- kfree (iso_sched);
-}
-
-static int
-itd_urb_transaction (
- struct fusbh200_iso_stream *stream,
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- gfp_t mem_flags
-)
-{
- struct fusbh200_itd *itd;
- dma_addr_t itd_dma;
- int i;
- unsigned num_itds;
- struct fusbh200_iso_sched *sched;
- unsigned long flags;
-
- sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
- if (unlikely (sched == NULL))
- return -ENOMEM;
-
- itd_sched_init(fusbh200, sched, stream, urb);
-
- if (urb->interval < 8)
- num_itds = 1 + (sched->span + 7) / 8;
- else
- num_itds = urb->number_of_packets;
-
- /* allocate/init ITDs */
- spin_lock_irqsave (&fusbh200->lock, flags);
- for (i = 0; i < num_itds; i++) {
-
- /*
- * Use iTDs from the free list, but not iTDs that may
- * still be in use by the hardware.
- */
- if (likely(!list_empty(&stream->free_list))) {
- itd = list_first_entry(&stream->free_list,
- struct fusbh200_itd, itd_list);
- if (itd->frame == fusbh200->now_frame)
- goto alloc_itd;
- list_del (&itd->itd_list);
- itd_dma = itd->itd_dma;
- } else {
- alloc_itd:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- itd = dma_pool_alloc (fusbh200->itd_pool, mem_flags,
- &itd_dma);
- spin_lock_irqsave (&fusbh200->lock, flags);
- if (!itd) {
- iso_sched_free(stream, sched);
- spin_unlock_irqrestore(&fusbh200->lock, flags);
- return -ENOMEM;
- }
- }
-
- memset (itd, 0, sizeof *itd);
- itd->itd_dma = itd_dma;
- list_add (&itd->itd_list, &sched->td_list);
- }
- spin_unlock_irqrestore (&fusbh200->lock, flags);
-
- /* temporarily store schedule info in hcpriv */
- urb->hcpriv = sched;
- urb->error_count = 0;
- return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static inline int
-itd_slot_ok (
- struct fusbh200_hcd *fusbh200,
- u32 mod,
- u32 uframe,
- u8 usecs,
- u32 period
-)
-{
- uframe %= period;
- do {
- /* can't commit more than uframe_periodic_max usec */
- if (periodic_usecs (fusbh200, uframe >> 3, uframe & 0x7)
- > (fusbh200->uframe_periodic_max - usecs))
- return 0;
-
- /* we know urb->interval is 2^N uframes */
- uframe += period;
- } while (uframe < mod);
- return 1;
-}
-
-/*
- * This scheduler plans almost as far into the future as it has actual
- * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
- * "as small as possible" to be cache-friendlier.) That limits the size
- * transfers you can stream reliably; avoid more than 64 msec per urb.
- * Also avoid queue depths of less than fusbh200's worst irq latency (affected
- * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
- * and other factors); or more than about 230 msec total (for portability,
- * given FUSBH200_TUNE_FLS and the slop). Or, write a smarter scheduler!
- */
-
-#define SCHEDULE_SLOP 80 /* microframes */
-
-static int
-iso_stream_schedule (
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- struct fusbh200_iso_stream *stream
-)
-{
- u32 now, next, start, period, span;
- int status;
- unsigned mod = fusbh200->periodic_size << 3;
- struct fusbh200_iso_sched *sched = urb->hcpriv;
-
- period = urb->interval;
- span = sched->span;
-
- if (span > mod - SCHEDULE_SLOP) {
- fusbh200_dbg (fusbh200, "iso request %p too long\n", urb);
- status = -EFBIG;
- goto fail;
- }
-
- now = fusbh200_read_frame_index(fusbh200) & (mod - 1);
-
- /* Typical case: reuse current schedule, stream is still active.
- * Hopefully there are no gaps from the host falling behind
- * (irq delays etc), but if there are we'll take the next
- * slot in the schedule, implicitly assuming URB_ISO_ASAP.
- */
- if (likely (!list_empty (&stream->td_list))) {
- u32 excess;
-
- /* For high speed devices, allow scheduling within the
- * isochronous scheduling threshold. For full speed devices
- * and Intel PCI-based controllers, don't (work around for
- * Intel ICH9 bug).
- */
- if (!stream->highspeed && fusbh200->fs_i_thresh)
- next = now + fusbh200->i_thresh;
- else
- next = now;
-
- /* Fell behind (by up to twice the slop amount)?
- * We decide based on the time of the last currently-scheduled
- * slot, not the time of the next available slot.
- */
- excess = (stream->next_uframe - period - next) & (mod - 1);
- if (excess >= mod - 2 * SCHEDULE_SLOP)
- start = next + excess - mod + period *
- DIV_ROUND_UP(mod - excess, period);
- else
- start = next + excess + period;
- if (start - now >= mod) {
- fusbh200_dbg(fusbh200, "request %p would overflow (%d+%d >= %d)\n",
- urb, start - now - period, period,
- mod);
- status = -EFBIG;
- goto fail;
- }
- }
-
- /* need to schedule; when's the next (u)frame we could start?
- * this is bigger than fusbh200->i_thresh allows; scheduling itself
- * isn't free, the slop should handle reasonably slow cpus. it
- * can also help high bandwidth if the dma and irq loads don't
- * jump until after the queue is primed.
- */
- else {
- int done = 0;
- start = SCHEDULE_SLOP + (now & ~0x07);
-
- /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
-
- /* find a uframe slot with enough bandwidth.
- * Early uframes are more precious because full-speed
- * iso IN transfers can't use late uframes,
- * and therefore they should be allocated last.
- */
- next = start;
- start += period;
- do {
- start--;
- /* check schedule: enough space? */
- if (itd_slot_ok(fusbh200, mod, start,
- stream->usecs, period))
- done = 1;
- } while (start > next && !done);
-
- /* no room in the schedule */
- if (!done) {
- fusbh200_dbg(fusbh200, "iso resched full %p (now %d max %d)\n",
- urb, now, now + mod);
- status = -ENOSPC;
- goto fail;
- }
- }
-
- /* Tried to schedule too far into the future? */
- if (unlikely(start - now + span - period
- >= mod - 2 * SCHEDULE_SLOP)) {
- fusbh200_dbg(fusbh200, "request %p would overflow (%d+%d >= %d)\n",
- urb, start - now, span - period,
- mod - 2 * SCHEDULE_SLOP);
- status = -EFBIG;
- goto fail;
- }
-
- stream->next_uframe = start & (mod - 1);
-
- /* report high speed start in uframes; full speed, in frames */
- urb->start_frame = stream->next_uframe;
- if (!stream->highspeed)
- urb->start_frame >>= 3;
-
- /* Make sure scan_isoc() sees these */
- if (fusbh200->isoc_count == 0)
- fusbh200->next_frame = now >> 3;
- return 0;
-
- fail:
- iso_sched_free(stream, sched);
- urb->hcpriv = NULL;
- return status;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static inline void
-itd_init(struct fusbh200_hcd *fusbh200, struct fusbh200_iso_stream *stream,
- struct fusbh200_itd *itd)
-{
- int i;
-
- /* it's been recently zeroed */
- itd->hw_next = FUSBH200_LIST_END(fusbh200);
- itd->hw_bufp [0] = stream->buf0;
- itd->hw_bufp [1] = stream->buf1;
- itd->hw_bufp [2] = stream->buf2;
-
- for (i = 0; i < 8; i++)
- itd->index[i] = -1;
-
- /* All other fields are filled when scheduling */
-}
-
-static inline void
-itd_patch(
- struct fusbh200_hcd *fusbh200,
- struct fusbh200_itd *itd,
- struct fusbh200_iso_sched *iso_sched,
- unsigned index,
- u16 uframe
-)
-{
- struct fusbh200_iso_packet *uf = &iso_sched->packet [index];
- unsigned pg = itd->pg;
-
- // BUG_ON (pg == 6 && uf->cross);
-
- uframe &= 0x07;
- itd->index [uframe] = index;
-
- itd->hw_transaction[uframe] = uf->transaction;
- itd->hw_transaction[uframe] |= cpu_to_hc32(fusbh200, pg << 12);
- itd->hw_bufp[pg] |= cpu_to_hc32(fusbh200, uf->bufp & ~(u32)0);
- itd->hw_bufp_hi[pg] |= cpu_to_hc32(fusbh200, (u32)(uf->bufp >> 32));
-
- /* iso_frame_desc[].offset must be strictly increasing */
- if (unlikely (uf->cross)) {
- u64 bufp = uf->bufp + 4096;
-
- itd->pg = ++pg;
- itd->hw_bufp[pg] |= cpu_to_hc32(fusbh200, bufp & ~(u32)0);
- itd->hw_bufp_hi[pg] |= cpu_to_hc32(fusbh200, (u32)(bufp >> 32));
- }
-}
-
-static inline void
-itd_link (struct fusbh200_hcd *fusbh200, unsigned frame, struct fusbh200_itd *itd)
-{
- union fusbh200_shadow *prev = &fusbh200->pshadow[frame];
- __hc32 *hw_p = &fusbh200->periodic[frame];
- union fusbh200_shadow here = *prev;
- __hc32 type = 0;
-
- /* skip any iso nodes which might belong to previous microframes */
- while (here.ptr) {
- type = Q_NEXT_TYPE(fusbh200, *hw_p);
- if (type == cpu_to_hc32(fusbh200, Q_TYPE_QH))
- break;
- prev = periodic_next_shadow(fusbh200, prev, type);
- hw_p = shadow_next_periodic(fusbh200, &here, type);
- here = *prev;
- }
-
- itd->itd_next = here;
- itd->hw_next = *hw_p;
- prev->itd = itd;
- itd->frame = frame;
- wmb ();
- *hw_p = cpu_to_hc32(fusbh200, itd->itd_dma | Q_TYPE_ITD);
-}
-
-/* fit urb's itds into the selected schedule slot; activate as needed */
-static void itd_link_urb(
- struct fusbh200_hcd *fusbh200,
- struct urb *urb,
- unsigned mod,
- struct fusbh200_iso_stream *stream
-)
-{
- int packet;
- unsigned next_uframe, uframe, frame;
- struct fusbh200_iso_sched *iso_sched = urb->hcpriv;
- struct fusbh200_itd *itd;
-
- next_uframe = stream->next_uframe & (mod - 1);
-
- if (unlikely (list_empty(&stream->td_list))) {
- fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated
- += stream->bandwidth;
- fusbh200_dbg(fusbh200,
- "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
- urb->dev->devpath, stream->bEndpointAddress & 0x0f,
- (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
- urb->interval,
- next_uframe >> 3, next_uframe & 0x7);
- }
-
- /* fill iTDs uframe by uframe */
- for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) {
- if (itd == NULL) {
- /* ASSERT: we have all necessary itds */
- // BUG_ON (list_empty (&iso_sched->td_list));
-
- /* ASSERT: no itds for this endpoint in this uframe */
-
- itd = list_entry (iso_sched->td_list.next,
- struct fusbh200_itd, itd_list);
- list_move_tail (&itd->itd_list, &stream->td_list);
- itd->stream = stream;
- itd->urb = urb;
- itd_init (fusbh200, stream, itd);
- }
-
- uframe = next_uframe & 0x07;
- frame = next_uframe >> 3;
-
- itd_patch(fusbh200, itd, iso_sched, packet, uframe);
-
- next_uframe += stream->interval;
- next_uframe &= mod - 1;
- packet++;
-
- /* link completed itds into the schedule */
- if (((next_uframe >> 3) != frame)
- || packet == urb->number_of_packets) {
- itd_link(fusbh200, frame & (fusbh200->periodic_size - 1), itd);
- itd = NULL;
- }
- }
- stream->next_uframe = next_uframe;
-
- /* don't need that schedule data any more */
- iso_sched_free (stream, iso_sched);
- urb->hcpriv = NULL;
-
- ++fusbh200->isoc_count;
- enable_periodic(fusbh200);
-}
-
-#define ISO_ERRS (FUSBH200_ISOC_BUF_ERR | FUSBH200_ISOC_BABBLE | FUSBH200_ISOC_XACTERR)
-
-/* Process and recycle a completed ITD. Return true iff its urb completed,
- * and hence its completion callback probably added things to the hardware
- * schedule.
- *
- * Note that we carefully avoid recycling this descriptor until after any
- * completion callback runs, so that it won't be reused quickly. That is,
- * assuming (a) no more than two urbs per frame on this endpoint, and also
- * (b) only this endpoint's completions submit URBs. It seems some silicon
- * corrupts things if you reuse completed descriptors very quickly...
- */
-static bool itd_complete(struct fusbh200_hcd *fusbh200, struct fusbh200_itd *itd)
-{
- struct urb *urb = itd->urb;
- struct usb_iso_packet_descriptor *desc;
- u32 t;
- unsigned uframe;
- int urb_index = -1;
- struct fusbh200_iso_stream *stream = itd->stream;
- struct usb_device *dev;
- bool retval = false;
-
- /* for each uframe with a packet */
- for (uframe = 0; uframe < 8; uframe++) {
- if (likely (itd->index[uframe] == -1))
- continue;
- urb_index = itd->index[uframe];
- desc = &urb->iso_frame_desc [urb_index];
-
- t = hc32_to_cpup(fusbh200, &itd->hw_transaction [uframe]);
- itd->hw_transaction [uframe] = 0;
-
- /* report transfer status */
- if (unlikely (t & ISO_ERRS)) {
- urb->error_count++;
- if (t & FUSBH200_ISOC_BUF_ERR)
- desc->status = usb_pipein (urb->pipe)
- ? -ENOSR /* hc couldn't read */
- : -ECOMM; /* hc couldn't write */
- else if (t & FUSBH200_ISOC_BABBLE)
- desc->status = -EOVERFLOW;
- else /* (t & FUSBH200_ISOC_XACTERR) */
- desc->status = -EPROTO;
-
- /* HC need not update length with this error */
- if (!(t & FUSBH200_ISOC_BABBLE)) {
- desc->actual_length = fusbh200_itdlen(urb, desc, t);
- urb->actual_length += desc->actual_length;
- }
- } else if (likely ((t & FUSBH200_ISOC_ACTIVE) == 0)) {
- desc->status = 0;
- desc->actual_length = fusbh200_itdlen(urb, desc, t);
- urb->actual_length += desc->actual_length;
- } else {
- /* URB was too late */
- desc->status = -EXDEV;
- }
- }
-
- /* handle completion now? */
- if (likely ((urb_index + 1) != urb->number_of_packets))
- goto done;
-
- /* ASSERT: it's really the last itd for this urb
- list_for_each_entry (itd, &stream->td_list, itd_list)
- BUG_ON (itd->urb == urb);
- */
-
- /* give urb back to the driver; completion often (re)submits */
- dev = urb->dev;
- fusbh200_urb_done(fusbh200, urb, 0);
- retval = true;
- urb = NULL;
-
- --fusbh200->isoc_count;
- disable_periodic(fusbh200);
-
- if (unlikely(list_is_singular(&stream->td_list))) {
- fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated
- -= stream->bandwidth;
- fusbh200_dbg(fusbh200,
- "deschedule devp %s ep%d%s-iso\n",
- dev->devpath, stream->bEndpointAddress & 0x0f,
- (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
- }
-
-done:
- itd->urb = NULL;
-
- /* Add to the end of the free list for later reuse */
- list_move_tail(&itd->itd_list, &stream->free_list);
-
- /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
- if (list_empty(&stream->td_list)) {
- list_splice_tail_init(&stream->free_list,
- &fusbh200->cached_itd_list);
- start_free_itds(fusbh200);
- }
-
- return retval;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int itd_submit (struct fusbh200_hcd *fusbh200, struct urb *urb,
- gfp_t mem_flags)
-{
- int status = -EINVAL;
- unsigned long flags;
- struct fusbh200_iso_stream *stream;
-
- /* Get iso_stream head */
- stream = iso_stream_find (fusbh200, urb);
- if (unlikely (stream == NULL)) {
- fusbh200_dbg (fusbh200, "can't get iso stream\n");
- return -ENOMEM;
- }
- if (unlikely (urb->interval != stream->interval &&
- fusbh200_port_speed(fusbh200, 0) == USB_PORT_STAT_HIGH_SPEED)) {
- fusbh200_dbg (fusbh200, "can't change iso interval %d --> %d\n",
- stream->interval, urb->interval);
- goto done;
- }
-
-#ifdef FUSBH200_URB_TRACE
- fusbh200_dbg (fusbh200,
- "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
- __func__, urb->dev->devpath, urb,
- usb_pipeendpoint (urb->pipe),
- usb_pipein (urb->pipe) ? "in" : "out",
- urb->transfer_buffer_length,
- urb->number_of_packets, urb->interval,
- stream);
-#endif
-
- /* allocate ITDs w/o locking anything */
- status = itd_urb_transaction (stream, fusbh200, urb, mem_flags);
- if (unlikely (status < 0)) {
- fusbh200_dbg (fusbh200, "can't init itds\n");
- goto done;
- }
-
- /* schedule ... need to lock */
- spin_lock_irqsave (&fusbh200->lock, flags);
- if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
- status = -ESHUTDOWN;
- goto done_not_linked;
- }
- status = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
- if (unlikely(status))
- goto done_not_linked;
- status = iso_stream_schedule(fusbh200, urb, stream);
- if (likely (status == 0))
- itd_link_urb (fusbh200, urb, fusbh200->periodic_size << 3, stream);
- else
- usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
- done_not_linked:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- done:
- return status;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void scan_isoc(struct fusbh200_hcd *fusbh200)
-{
- unsigned uf, now_frame, frame;
- unsigned fmask = fusbh200->periodic_size - 1;
- bool modified, live;
-
- /*
- * When running, scan from last scan point up to "now"
- * else clean up by scanning everything that's left.
- * Touches as few pages as possible: cache-friendly.
- */
- if (fusbh200->rh_state >= FUSBH200_RH_RUNNING) {
- uf = fusbh200_read_frame_index(fusbh200);
- now_frame = (uf >> 3) & fmask;
- live = true;
- } else {
- now_frame = (fusbh200->next_frame - 1) & fmask;
- live = false;
- }
- fusbh200->now_frame = now_frame;
-
- frame = fusbh200->next_frame;
- for (;;) {
- union fusbh200_shadow q, *q_p;
- __hc32 type, *hw_p;
-
-restart:
- /* scan each element in frame's queue for completions */
- q_p = &fusbh200->pshadow [frame];
- hw_p = &fusbh200->periodic [frame];
- q.ptr = q_p->ptr;
- type = Q_NEXT_TYPE(fusbh200, *hw_p);
- modified = false;
-
- while (q.ptr != NULL) {
- switch (hc32_to_cpu(fusbh200, type)) {
- case Q_TYPE_ITD:
- /* If this ITD is still active, leave it for
- * later processing ... check the next entry.
- * No need to check for activity unless the
- * frame is current.
- */
- if (frame == now_frame && live) {
- rmb();
- for (uf = 0; uf < 8; uf++) {
- if (q.itd->hw_transaction[uf] &
- ITD_ACTIVE(fusbh200))
- break;
- }
- if (uf < 8) {
- q_p = &q.itd->itd_next;
- hw_p = &q.itd->hw_next;
- type = Q_NEXT_TYPE(fusbh200,
- q.itd->hw_next);
- q = *q_p;
- break;
- }
- }
-
- /* Take finished ITDs out of the schedule
- * and process them: recycle, maybe report
- * URB completion. HC won't cache the
- * pointer for much longer, if at all.
- */
- *q_p = q.itd->itd_next;
- *hw_p = q.itd->hw_next;
- type = Q_NEXT_TYPE(fusbh200, q.itd->hw_next);
- wmb();
- modified = itd_complete (fusbh200, q.itd);
- q = *q_p;
- break;
- default:
- fusbh200_dbg(fusbh200, "corrupt type %d frame %d shadow %p\n",
- type, frame, q.ptr);
- // BUG ();
- /* FALL THROUGH */
- case Q_TYPE_QH:
- case Q_TYPE_FSTN:
- /* End of the iTDs and siTDs */
- q.ptr = NULL;
- break;
- }
-
- /* assume completion callbacks modify the queue */
- if (unlikely(modified && fusbh200->isoc_count > 0))
- goto restart;
- }
-
- /* Stop when we have reached the current frame */
- if (frame == now_frame)
- break;
- frame = (frame + 1) & fmask;
- }
- fusbh200->next_frame = now_frame;
-}
-/*-------------------------------------------------------------------------*/
-/*
- * Display / Set uframe_periodic_max
- */
-static ssize_t show_uframe_periodic_max(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct fusbh200_hcd *fusbh200;
- int n;
-
- fusbh200 = hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev)));
- n = scnprintf(buf, PAGE_SIZE, "%d\n", fusbh200->uframe_periodic_max);
- return n;
-}
-
-
-static ssize_t store_uframe_periodic_max(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct fusbh200_hcd *fusbh200;
- unsigned uframe_periodic_max;
- unsigned frame, uframe;
- unsigned short allocated_max;
- unsigned long flags;
- ssize_t ret;
-
- fusbh200 = hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev)));
- if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
- return -EINVAL;
-
- if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
- fusbh200_info(fusbh200, "rejecting invalid request for "
- "uframe_periodic_max=%u\n", uframe_periodic_max);
- return -EINVAL;
- }
-
- ret = -EINVAL;
-
- /*
- * lock, so that our checking does not race with possible periodic
- * bandwidth allocation through submitting new urbs.
- */
- spin_lock_irqsave (&fusbh200->lock, flags);
-
- /*
- * for request to decrease max periodic bandwidth, we have to check
- * every microframe in the schedule to see whether the decrease is
- * possible.
- */
- if (uframe_periodic_max < fusbh200->uframe_periodic_max) {
- allocated_max = 0;
-
- for (frame = 0; frame < fusbh200->periodic_size; ++frame)
- for (uframe = 0; uframe < 7; ++uframe)
- allocated_max = max(allocated_max,
- periodic_usecs (fusbh200, frame, uframe));
-
- if (allocated_max > uframe_periodic_max) {
- fusbh200_info(fusbh200,
- "cannot decrease uframe_periodic_max because "
- "periodic bandwidth is already allocated "
- "(%u > %u)\n",
- allocated_max, uframe_periodic_max);
- goto out_unlock;
- }
- }
-
- /* increasing is always ok */
-
- fusbh200_info(fusbh200, "setting max periodic bandwidth to %u%% "
- "(== %u usec/uframe)\n",
- 100*uframe_periodic_max/125, uframe_periodic_max);
-
- if (uframe_periodic_max != 100)
- fusbh200_warn(fusbh200, "max periodic bandwidth set is non-standard\n");
-
- fusbh200->uframe_periodic_max = uframe_periodic_max;
- ret = count;
-
-out_unlock:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- return ret;
-}
-static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
-
-
-static inline int create_sysfs_files(struct fusbh200_hcd *fusbh200)
-{
- struct device *controller = fusbh200_to_hcd(fusbh200)->self.controller;
- int i = 0;
-
- if (i)
- goto out;
-
- i = device_create_file(controller, &dev_attr_uframe_periodic_max);
-out:
- return i;
-}
-
-static inline void remove_sysfs_files(struct fusbh200_hcd *fusbh200)
-{
- struct device *controller = fusbh200_to_hcd(fusbh200)->self.controller;
-
- device_remove_file(controller, &dev_attr_uframe_periodic_max);
-}
-/*-------------------------------------------------------------------------*/
-
-/* On some systems, leaving remote wakeup enabled prevents system shutdown.
- * The firmware seems to think that powering off is a wakeup event!
- * This routine turns off remote wakeup and everything else, on all ports.
- */
-static void fusbh200_turn_off_all_ports(struct fusbh200_hcd *fusbh200)
-{
- u32 __iomem *status_reg = &fusbh200->regs->port_status;
-
- fusbh200_writel(fusbh200, PORT_RWC_BITS, status_reg);
-}
-
-/*
- * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
- * Must be called with interrupts enabled and the lock not held.
- */
-static void fusbh200_silence_controller(struct fusbh200_hcd *fusbh200)
-{
- fusbh200_halt(fusbh200);
-
- spin_lock_irq(&fusbh200->lock);
- fusbh200->rh_state = FUSBH200_RH_HALTED;
- fusbh200_turn_off_all_ports(fusbh200);
- spin_unlock_irq(&fusbh200->lock);
-}
-
-/* fusbh200_shutdown kick in for silicon on any bus (not just pci, etc).
- * This forcibly disables dma and IRQs, helping kexec and other cases
- * where the next system software may expect clean state.
- */
-static void fusbh200_shutdown(struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
-
- spin_lock_irq(&fusbh200->lock);
- fusbh200->shutdown = true;
- fusbh200->rh_state = FUSBH200_RH_STOPPING;
- fusbh200->enabled_hrtimer_events = 0;
- spin_unlock_irq(&fusbh200->lock);
-
- fusbh200_silence_controller(fusbh200);
-
- hrtimer_cancel(&fusbh200->hrtimer);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * fusbh200_work is called from some interrupts, timers, and so on.
- * it calls driver completion functions, after dropping fusbh200->lock.
- */
-static void fusbh200_work (struct fusbh200_hcd *fusbh200)
-{
- /* another CPU may drop fusbh200->lock during a schedule scan while
- * it reports urb completions. this flag guards against bogus
- * attempts at re-entrant schedule scanning.
- */
- if (fusbh200->scanning) {
- fusbh200->need_rescan = true;
- return;
- }
- fusbh200->scanning = true;
-
- rescan:
- fusbh200->need_rescan = false;
- if (fusbh200->async_count)
- scan_async(fusbh200);
- if (fusbh200->intr_count > 0)
- scan_intr(fusbh200);
- if (fusbh200->isoc_count > 0)
- scan_isoc(fusbh200);
- if (fusbh200->need_rescan)
- goto rescan;
- fusbh200->scanning = false;
-
- /* the IO watchdog guards against hardware or driver bugs that
- * misplace IRQs, and should let us run completely without IRQs.
- * such lossage has been observed on both VT6202 and VT8235.
- */
- turn_on_io_watchdog(fusbh200);
-}
-
-/*
- * Called when the fusbh200_hcd module is removed.
- */
-static void fusbh200_stop (struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
-
- fusbh200_dbg (fusbh200, "stop\n");
-
- /* no more interrupts ... */
-
- spin_lock_irq(&fusbh200->lock);
- fusbh200->enabled_hrtimer_events = 0;
- spin_unlock_irq(&fusbh200->lock);
-
- fusbh200_quiesce(fusbh200);
- fusbh200_silence_controller(fusbh200);
- fusbh200_reset (fusbh200);
-
- hrtimer_cancel(&fusbh200->hrtimer);
- remove_sysfs_files(fusbh200);
- remove_debug_files (fusbh200);
-
- /* root hub is shut down separately (first, when possible) */
- spin_lock_irq (&fusbh200->lock);
- end_free_itds(fusbh200);
- spin_unlock_irq (&fusbh200->lock);
- fusbh200_mem_cleanup (fusbh200);
-
- fusbh200_dbg(fusbh200, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
- fusbh200->stats.normal, fusbh200->stats.error, fusbh200->stats.iaa,
- fusbh200->stats.lost_iaa);
- fusbh200_dbg (fusbh200, "complete %ld unlink %ld\n",
- fusbh200->stats.complete, fusbh200->stats.unlink);
-
- dbg_status (fusbh200, "fusbh200_stop completed",
- fusbh200_readl(fusbh200, &fusbh200->regs->status));
-}
-
-/* one-time init, only for memory state */
-static int hcd_fusbh200_init(struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
- u32 temp;
- int retval;
- u32 hcc_params;
- struct fusbh200_qh_hw *hw;
-
- spin_lock_init(&fusbh200->lock);
-
- /*
- * keep io watchdog by default, those good HCDs could turn off it later
- */
- fusbh200->need_io_watchdog = 1;
-
- hrtimer_init(&fusbh200->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
- fusbh200->hrtimer.function = fusbh200_hrtimer_func;
- fusbh200->next_hrtimer_event = FUSBH200_HRTIMER_NO_EVENT;
-
- hcc_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
-
- /*
- * by default set standard 80% (== 100 usec/uframe) max periodic
- * bandwidth as required by USB 2.0
- */
- fusbh200->uframe_periodic_max = 100;
-
- /*
- * hw default: 1K periodic list heads, one per frame.
- * periodic_size can shrink by USBCMD update if hcc_params allows.
- */
- fusbh200->periodic_size = DEFAULT_I_TDPS;
- INIT_LIST_HEAD(&fusbh200->intr_qh_list);
- INIT_LIST_HEAD(&fusbh200->cached_itd_list);
-
- if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
- /* periodic schedule size can be smaller than default */
- switch (FUSBH200_TUNE_FLS) {
- case 0: fusbh200->periodic_size = 1024; break;
- case 1: fusbh200->periodic_size = 512; break;
- case 2: fusbh200->periodic_size = 256; break;
- default: BUG();
- }
- }
- if ((retval = fusbh200_mem_init(fusbh200, GFP_KERNEL)) < 0)
- return retval;
-
- /* controllers may cache some of the periodic schedule ... */
- fusbh200->i_thresh = 2;
-
- /*
- * dedicate a qh for the async ring head, since we couldn't unlink
- * a 'real' qh without stopping the async schedule [4.8]. use it
- * as the 'reclamation list head' too.
- * its dummy is used in hw_alt_next of many tds, to prevent the qh
- * from automatically advancing to the next td after short reads.
- */
- fusbh200->async->qh_next.qh = NULL;
- hw = fusbh200->async->hw;
- hw->hw_next = QH_NEXT(fusbh200, fusbh200->async->qh_dma);
- hw->hw_info1 = cpu_to_hc32(fusbh200, QH_HEAD);
- hw->hw_token = cpu_to_hc32(fusbh200, QTD_STS_HALT);
- hw->hw_qtd_next = FUSBH200_LIST_END(fusbh200);
- fusbh200->async->qh_state = QH_STATE_LINKED;
- hw->hw_alt_next = QTD_NEXT(fusbh200, fusbh200->async->dummy->qtd_dma);
-
- /* clear interrupt enables, set irq latency */
- if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
- log2_irq_thresh = 0;
- temp = 1 << (16 + log2_irq_thresh);
- if (HCC_CANPARK(hcc_params)) {
- /* HW default park == 3, on hardware that supports it (like
- * NVidia and ALI silicon), maximizes throughput on the async
- * schedule by avoiding QH fetches between transfers.
- *
- * With fast usb storage devices and NForce2, "park" seems to
- * make problems: throughput reduction (!), data errors...
- */
- if (park) {
- park = min(park, (unsigned) 3);
- temp |= CMD_PARK;
- temp |= park << 8;
- }
- fusbh200_dbg(fusbh200, "park %d\n", park);
- }
- if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
- /* periodic schedule size can be smaller than default */
- temp &= ~(3 << 2);
- temp |= (FUSBH200_TUNE_FLS << 2);
- }
- fusbh200->command = temp;
-
- /* Accept arbitrarily long scatter-gather lists */
- if (!(hcd->driver->flags & HCD_LOCAL_MEM))
- hcd->self.sg_tablesize = ~0;
- return 0;
-}
-
-/* start HC running; it's halted, hcd_fusbh200_init() has been run (once) */
-static int fusbh200_run (struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- u32 temp;
- u32 hcc_params;
-
- hcd->uses_new_polling = 1;
-
- /* EHCI spec section 4.1 */
-
- fusbh200_writel(fusbh200, fusbh200->periodic_dma, &fusbh200->regs->frame_list);
- fusbh200_writel(fusbh200, (u32)fusbh200->async->qh_dma, &fusbh200->regs->async_next);
-
- /*
- * hcc_params controls whether fusbh200->regs->segment must (!!!)
- * be used; it constrains QH/ITD/SITD and QTD locations.
- * pci_pool consistent memory always uses segment zero.
- * streaming mappings for I/O buffers, like pci_map_single(),
- * can return segments above 4GB, if the device allows.
- *
- * NOTE: the dma mask is visible through dma_supported(), so
- * drivers can pass this info along ... like NETIF_F_HIGHDMA,
- * Scsi_Host.highmem_io, and so forth. It's readonly to all
- * host side drivers though.
- */
- hcc_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
-
- // Philips, Intel, and maybe others need CMD_RUN before the
- // root hub will detect new devices (why?); NEC doesn't
- fusbh200->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
- fusbh200->command |= CMD_RUN;
- fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
- dbg_cmd (fusbh200, "init", fusbh200->command);
-
- /*
- * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
- * are explicitly handed to companion controller(s), so no TT is
- * involved with the root hub. (Except where one is integrated,
- * and there's no companion controller unless maybe for USB OTG.)
- *
- * Turning on the CF flag will transfer ownership of all ports
- * from the companions to the EHCI controller. If any of the
- * companions are in the middle of a port reset at the time, it
- * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
- * guarantees that no resets are in progress. After we set CF,
- * a short delay lets the hardware catch up; new resets shouldn't
- * be started before the port switching actions could complete.
- */
- down_write(&ehci_cf_port_reset_rwsem);
- fusbh200->rh_state = FUSBH200_RH_RUNNING;
- fusbh200_readl(fusbh200, &fusbh200->regs->command); /* unblock posted writes */
- msleep(5);
- up_write(&ehci_cf_port_reset_rwsem);
- fusbh200->last_periodic_enable = ktime_get_real();
-
- temp = HC_VERSION(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
- fusbh200_info (fusbh200,
- "USB %x.%x started, EHCI %x.%02x\n",
- ((fusbh200->sbrn & 0xf0)>>4), (fusbh200->sbrn & 0x0f),
- temp >> 8, temp & 0xff);
-
- fusbh200_writel(fusbh200, INTR_MASK,
- &fusbh200->regs->intr_enable); /* Turn On Interrupts */
-
- /* GRR this is run-once init(), being done every time the HC starts.
- * So long as they're part of class devices, we can't do it init()
- * since the class device isn't created that early.
- */
- create_debug_files(fusbh200);
- create_sysfs_files(fusbh200);
-
- return 0;
-}
-
-static int fusbh200_setup(struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
- int retval;
-
- fusbh200->regs = (void __iomem *)fusbh200->caps +
- HC_LENGTH(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
- dbg_hcs_params(fusbh200, "reset");
- dbg_hcc_params(fusbh200, "reset");
-
- /* cache this readonly data; minimize chip reads */
- fusbh200->hcs_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
-
- fusbh200->sbrn = HCD_USB2;
-
- /* data structure init */
- retval = hcd_fusbh200_init(hcd);
- if (retval)
- return retval;
-
- retval = fusbh200_halt(fusbh200);
- if (retval)
- return retval;
-
- fusbh200_reset(fusbh200);
-
- return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static irqreturn_t fusbh200_irq (struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- u32 status, masked_status, pcd_status = 0, cmd;
- int bh;
-
- spin_lock (&fusbh200->lock);
-
- status = fusbh200_readl(fusbh200, &fusbh200->regs->status);
-
- /* e.g. cardbus physical eject */
- if (status == ~(u32) 0) {
- fusbh200_dbg (fusbh200, "device removed\n");
- goto dead;
- }
-
- /*
- * We don't use STS_FLR, but some controllers don't like it to
- * remain on, so mask it out along with the other status bits.
- */
- masked_status = status & (INTR_MASK | STS_FLR);
-
- /* Shared IRQ? */
- if (!masked_status || unlikely(fusbh200->rh_state == FUSBH200_RH_HALTED)) {
- spin_unlock(&fusbh200->lock);
- return IRQ_NONE;
- }
-
- /* clear (just) interrupts */
- fusbh200_writel(fusbh200, masked_status, &fusbh200->regs->status);
- cmd = fusbh200_readl(fusbh200, &fusbh200->regs->command);
- bh = 0;
-
- /* normal [4.15.1.2] or error [4.15.1.1] completion */
- if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
- if (likely ((status & STS_ERR) == 0))
- COUNT (fusbh200->stats.normal);
- else
- COUNT (fusbh200->stats.error);
- bh = 1;
- }
-
- /* complete the unlinking of some qh [4.15.2.3] */
- if (status & STS_IAA) {
-
- /* Turn off the IAA watchdog */
- fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_IAA_WATCHDOG);
-
- /*
- * Mild optimization: Allow another IAAD to reset the
- * hrtimer, if one occurs before the next expiration.
- * In theory we could always cancel the hrtimer, but
- * tests show that about half the time it will be reset
- * for some other event anyway.
- */
- if (fusbh200->next_hrtimer_event == FUSBH200_HRTIMER_IAA_WATCHDOG)
- ++fusbh200->next_hrtimer_event;
-
- /* guard against (alleged) silicon errata */
- if (cmd & CMD_IAAD)
- fusbh200_dbg(fusbh200, "IAA with IAAD still set?\n");
- if (fusbh200->async_iaa) {
- COUNT(fusbh200->stats.iaa);
- end_unlink_async(fusbh200);
- } else
- fusbh200_dbg(fusbh200, "IAA with nothing unlinked?\n");
- }
-
- /* remote wakeup [4.3.1] */
- if (status & STS_PCD) {
- int pstatus;
- u32 __iomem *status_reg = &fusbh200->regs->port_status;
-
- /* kick root hub later */
- pcd_status = status;
-
- /* resume root hub? */
- if (fusbh200->rh_state == FUSBH200_RH_SUSPENDED)
- usb_hcd_resume_root_hub(hcd);
-
- pstatus = fusbh200_readl(fusbh200, status_reg);
-
- if (test_bit(0, &fusbh200->suspended_ports) &&
- ((pstatus & PORT_RESUME) ||
- !(pstatus & PORT_SUSPEND)) &&
- (pstatus & PORT_PE) &&
- fusbh200->reset_done[0] == 0) {
-
- /* start 20 msec resume signaling from this port,
- * and make hub_wq collect PORT_STAT_C_SUSPEND to
- * stop that signaling. Use 5 ms extra for safety,
- * like usb_port_resume() does.
- */
- fusbh200->reset_done[0] = jiffies + msecs_to_jiffies(25);
- set_bit(0, &fusbh200->resuming_ports);
- fusbh200_dbg (fusbh200, "port 1 remote wakeup\n");
- mod_timer(&hcd->rh_timer, fusbh200->reset_done[0]);
- }
- }
-
- /* PCI errors [4.15.2.4] */
- if (unlikely ((status & STS_FATAL) != 0)) {
- fusbh200_err(fusbh200, "fatal error\n");
- dbg_cmd(fusbh200, "fatal", cmd);
- dbg_status(fusbh200, "fatal", status);
-dead:
- usb_hc_died(hcd);
-
- /* Don't let the controller do anything more */
- fusbh200->shutdown = true;
- fusbh200->rh_state = FUSBH200_RH_STOPPING;
- fusbh200->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
- fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
- fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
- fusbh200_handle_controller_death(fusbh200);
-
- /* Handle completions when the controller stops */
- bh = 0;
- }
-
- if (bh)
- fusbh200_work (fusbh200);
- spin_unlock (&fusbh200->lock);
- if (pcd_status)
- usb_hcd_poll_rh_status(hcd);
- return IRQ_HANDLED;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * non-error returns are a promise to giveback() the urb later
- * we drop ownership so next owner (or urb unlink) can get it
- *
- * urb + dev is in hcd.self.controller.urb_list
- * we're queueing TDs onto software and hardware lists
- *
- * hcd-specific init for hcpriv hasn't been done yet
- *
- * NOTE: control, bulk, and interrupt share the same code to append TDs
- * to a (possibly active) QH, and the same QH scanning code.
- */
-static int fusbh200_urb_enqueue (
- struct usb_hcd *hcd,
- struct urb *urb,
- gfp_t mem_flags
-) {
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- struct list_head qtd_list;
-
- INIT_LIST_HEAD (&qtd_list);
-
- switch (usb_pipetype (urb->pipe)) {
- case PIPE_CONTROL:
- /* qh_completions() code doesn't handle all the fault cases
- * in multi-TD control transfers. Even 1KB is rare anyway.
- */
- if (urb->transfer_buffer_length > (16 * 1024))
- return -EMSGSIZE;
- /* FALLTHROUGH */
- /* case PIPE_BULK: */
- default:
- if (!qh_urb_transaction (fusbh200, urb, &qtd_list, mem_flags))
- return -ENOMEM;
- return submit_async(fusbh200, urb, &qtd_list, mem_flags);
-
- case PIPE_INTERRUPT:
- if (!qh_urb_transaction (fusbh200, urb, &qtd_list, mem_flags))
- return -ENOMEM;
- return intr_submit(fusbh200, urb, &qtd_list, mem_flags);
-
- case PIPE_ISOCHRONOUS:
- return itd_submit (fusbh200, urb, mem_flags);
- }
-}
-
-/* remove from hardware lists
- * completions normally happen asynchronously
- */
-
-static int fusbh200_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- struct fusbh200_qh *qh;
- unsigned long flags;
- int rc;
-
- spin_lock_irqsave (&fusbh200->lock, flags);
- rc = usb_hcd_check_unlink_urb(hcd, urb, status);
- if (rc)
- goto done;
-
- switch (usb_pipetype (urb->pipe)) {
- // case PIPE_CONTROL:
- // case PIPE_BULK:
- default:
- qh = (struct fusbh200_qh *) urb->hcpriv;
- if (!qh)
- break;
- switch (qh->qh_state) {
- case QH_STATE_LINKED:
- case QH_STATE_COMPLETING:
- start_unlink_async(fusbh200, qh);
- break;
- case QH_STATE_UNLINK:
- case QH_STATE_UNLINK_WAIT:
- /* already started */
- break;
- case QH_STATE_IDLE:
- /* QH might be waiting for a Clear-TT-Buffer */
- qh_completions(fusbh200, qh);
- break;
- }
- break;
-
- case PIPE_INTERRUPT:
- qh = (struct fusbh200_qh *) urb->hcpriv;
- if (!qh)
- break;
- switch (qh->qh_state) {
- case QH_STATE_LINKED:
- case QH_STATE_COMPLETING:
- start_unlink_intr(fusbh200, qh);
- break;
- case QH_STATE_IDLE:
- qh_completions (fusbh200, qh);
- break;
- default:
- fusbh200_dbg (fusbh200, "bogus qh %p state %d\n",
- qh, qh->qh_state);
- goto done;
- }
- break;
-
- case PIPE_ISOCHRONOUS:
- // itd...
-
- // wait till next completion, do it then.
- // completion irqs can wait up to 1024 msec,
- break;
- }
-done:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- return rc;
-}
-
-/*-------------------------------------------------------------------------*/
-
-// bulk qh holds the data toggle
-
-static void
-fusbh200_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- unsigned long flags;
- struct fusbh200_qh *qh, *tmp;
-
- /* ASSERT: any requests/urbs are being unlinked */
- /* ASSERT: nobody can be submitting urbs for this any more */
-
-rescan:
- spin_lock_irqsave (&fusbh200->lock, flags);
- qh = ep->hcpriv;
- if (!qh)
- goto done;
-
- /* endpoints can be iso streams. for now, we don't
- * accelerate iso completions ... so spin a while.
- */
- if (qh->hw == NULL) {
- struct fusbh200_iso_stream *stream = ep->hcpriv;
-
- if (!list_empty(&stream->td_list))
- goto idle_timeout;
-
- /* BUG_ON(!list_empty(&stream->free_list)); */
- kfree(stream);
- goto done;
- }
-
- if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
- qh->qh_state = QH_STATE_IDLE;
- switch (qh->qh_state) {
- case QH_STATE_LINKED:
- case QH_STATE_COMPLETING:
- for (tmp = fusbh200->async->qh_next.qh;
- tmp && tmp != qh;
- tmp = tmp->qh_next.qh)
- continue;
- /* periodic qh self-unlinks on empty, and a COMPLETING qh
- * may already be unlinked.
- */
- if (tmp)
- start_unlink_async(fusbh200, qh);
- /* FALL THROUGH */
- case QH_STATE_UNLINK: /* wait for hw to finish? */
- case QH_STATE_UNLINK_WAIT:
-idle_timeout:
- spin_unlock_irqrestore (&fusbh200->lock, flags);
- schedule_timeout_uninterruptible(1);
- goto rescan;
- case QH_STATE_IDLE: /* fully unlinked */
- if (qh->clearing_tt)
- goto idle_timeout;
- if (list_empty (&qh->qtd_list)) {
- qh_destroy(fusbh200, qh);
- break;
- }
- /* else FALL THROUGH */
- default:
- /* caller was supposed to have unlinked any requests;
- * that's not our job. just leak this memory.
- */
- fusbh200_err (fusbh200, "qh %p (#%02x) state %d%s\n",
- qh, ep->desc.bEndpointAddress, qh->qh_state,
- list_empty (&qh->qtd_list) ? "" : "(has tds)");
- break;
- }
- done:
- ep->hcpriv = NULL;
- spin_unlock_irqrestore (&fusbh200->lock, flags);
-}
-
-static void
-fusbh200_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
- struct fusbh200_qh *qh;
- int eptype = usb_endpoint_type(&ep->desc);
- int epnum = usb_endpoint_num(&ep->desc);
- int is_out = usb_endpoint_dir_out(&ep->desc);
- unsigned long flags;
-
- if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
- return;
-
- spin_lock_irqsave(&fusbh200->lock, flags);
- qh = ep->hcpriv;
-
- /* For Bulk and Interrupt endpoints we maintain the toggle state
- * in the hardware; the toggle bits in udev aren't used at all.
- * When an endpoint is reset by usb_clear_halt() we must reset
- * the toggle bit in the QH.
- */
- if (qh) {
- usb_settoggle(qh->dev, epnum, is_out, 0);
- if (!list_empty(&qh->qtd_list)) {
- WARN_ONCE(1, "clear_halt for a busy endpoint\n");
- } else if (qh->qh_state == QH_STATE_LINKED ||
- qh->qh_state == QH_STATE_COMPLETING) {
-
- /* The toggle value in the QH can't be updated
- * while the QH is active. Unlink it now;
- * re-linking will call qh_refresh().
- */
- if (eptype == USB_ENDPOINT_XFER_BULK)
- start_unlink_async(fusbh200, qh);
- else
- start_unlink_intr(fusbh200, qh);
- }
- }
- spin_unlock_irqrestore(&fusbh200->lock, flags);
-}
-
-static int fusbh200_get_frame (struct usb_hcd *hcd)
-{
- struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200 (hcd);
- return (fusbh200_read_frame_index(fusbh200) >> 3) % fusbh200->periodic_size;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * The EHCI in ChipIdea HDRC cannot be a separate module or device,
- * because its registers (and irq) are shared between host/gadget/otg
- * functions and in order to facilitate role switching we cannot
- * give the fusbh200 driver exclusive access to those.
- */
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR (DRIVER_AUTHOR);
-MODULE_LICENSE ("GPL");
-
-static const struct hc_driver fusbh200_fusbh200_hc_driver = {
- .description = hcd_name,
- .product_desc = "Faraday USB2.0 Host Controller",
- .hcd_priv_size = sizeof(struct fusbh200_hcd),
-
- /*
- * generic hardware linkage
- */
- .irq = fusbh200_irq,
- .flags = HCD_MEMORY | HCD_USB2,
-
- /*
- * basic lifecycle operations
- */
- .reset = hcd_fusbh200_init,
- .start = fusbh200_run,
- .stop = fusbh200_stop,
- .shutdown = fusbh200_shutdown,
-
- /*
- * managing i/o requests and associated device resources
- */
- .urb_enqueue = fusbh200_urb_enqueue,
- .urb_dequeue = fusbh200_urb_dequeue,
- .endpoint_disable = fusbh200_endpoint_disable,
- .endpoint_reset = fusbh200_endpoint_reset,
-
- /*
- * scheduling support
- */
- .get_frame_number = fusbh200_get_frame,
-
- /*
- * root hub support
- */
- .hub_status_data = fusbh200_hub_status_data,
- .hub_control = fusbh200_hub_control,
- .bus_suspend = fusbh200_bus_suspend,
- .bus_resume = fusbh200_bus_resume,
-
- .relinquish_port = fusbh200_relinquish_port,
- .port_handed_over = fusbh200_port_handed_over,
-
- .clear_tt_buffer_complete = fusbh200_clear_tt_buffer_complete,
-};
-
-static void fusbh200_init(struct fusbh200_hcd *fusbh200)
-{
- u32 reg;
-
- reg = fusbh200_readl(fusbh200, &fusbh200->regs->bmcsr);
- reg |= BMCSR_INT_POLARITY;
- reg &= ~BMCSR_VBUS_OFF;
- fusbh200_writel(fusbh200, reg, &fusbh200->regs->bmcsr);
-
- reg = fusbh200_readl(fusbh200, &fusbh200->regs->bmier);
- fusbh200_writel(fusbh200, reg | BMIER_OVC_EN | BMIER_VBUS_ERR_EN,
- &fusbh200->regs->bmier);
-}
-
-/**
- * fusbh200_hcd_probe - initialize faraday FUSBH200 HCDs
- *
- * Allocates basic resources for this USB host controller, and
- * then invokes the start() method for the HCD associated with it
- * through the hotplug entry's driver_data.
- */
-static int fusbh200_hcd_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct usb_hcd *hcd;
- struct resource *res;
- int irq;
- int retval = -ENODEV;
- struct fusbh200_hcd *fusbh200;
-
- if (usb_disabled())
- return -ENODEV;
-
- pdev->dev.power.power_state = PMSG_ON;
-
- res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!res) {
- dev_err(dev,
- "Found HC with no IRQ. Check %s setup!\n",
- dev_name(dev));
- return -ENODEV;
- }
-
- irq = res->start;
-
- hcd = usb_create_hcd(&fusbh200_fusbh200_hc_driver, dev,
- dev_name(dev));
- if (!hcd) {
- dev_err(dev, "failed to create hcd with err %d\n", retval);
- retval = -ENOMEM;
- goto fail_create_hcd;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(dev,
- "Found HC with no register addr. Check %s setup!\n",
- dev_name(dev));
- retval = -ENODEV;
- goto fail_request_resource;
- }
-
- hcd->rsrc_start = res->start;
- hcd->rsrc_len = resource_size(res);
- hcd->has_tt = 1;
-
- if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
- fusbh200_fusbh200_hc_driver.description)) {
- dev_dbg(dev, "controller already in use\n");
- retval = -EBUSY;
- goto fail_request_resource;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (!res) {
- dev_err(dev,
- "Found HC with no register addr. Check %s setup!\n",
- dev_name(dev));
- retval = -ENODEV;
- goto fail_request_resource;
- }
-
- hcd->regs = ioremap_nocache(res->start, resource_size(res));
- if (hcd->regs == NULL) {
- dev_dbg(dev, "error mapping memory\n");
- retval = -EFAULT;
- goto fail_ioremap;
- }
-
- fusbh200 = hcd_to_fusbh200(hcd);
-
- fusbh200->caps = hcd->regs;
-
- retval = fusbh200_setup(hcd);
- if (retval)
- goto fail_add_hcd;
-
- fusbh200_init(fusbh200);
-
- retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
- if (retval) {
- dev_err(dev, "failed to add hcd with err %d\n", retval);
- goto fail_add_hcd;
- }
- device_wakeup_enable(hcd->self.controller);
-
- return retval;
-
-fail_add_hcd:
- iounmap(hcd->regs);
-fail_ioremap:
- release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
-fail_request_resource:
- usb_put_hcd(hcd);
-fail_create_hcd:
- dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
- return retval;
-}
-
-/**
- * fusbh200_hcd_remove - shutdown processing for EHCI HCDs
- * @dev: USB Host Controller being removed
- *
- * Reverses the effect of fotg2xx_usb_hcd_probe(), first invoking
- * the HCD's stop() method. It is always called from a thread
- * context, normally "rmmod", "apmd", or something similar.
- */
-static int fusbh200_hcd_remove(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct usb_hcd *hcd = dev_get_drvdata(dev);
-
- if (!hcd)
- return 0;
-
- usb_remove_hcd(hcd);
- iounmap(hcd->regs);
- release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
- usb_put_hcd(hcd);
-
- return 0;
-}
-
-static struct platform_driver fusbh200_hcd_fusbh200_driver = {
- .driver = {
- .name = "fusbh200",
- },
- .probe = fusbh200_hcd_probe,
- .remove = fusbh200_hcd_remove,
-};
-
-static int __init fusbh200_hcd_init(void)
-{
- int retval = 0;
-
- if (usb_disabled())
- return -ENODEV;
-
- printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
- set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
- if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
- test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
- printk(KERN_WARNING "Warning! fusbh200_hcd should always be loaded"
- " before uhci_hcd and ohci_hcd, not after\n");
-
- pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n",
- hcd_name,
- sizeof(struct fusbh200_qh), sizeof(struct fusbh200_qtd),
- sizeof(struct fusbh200_itd));
-
- fusbh200_debug_root = debugfs_create_dir("fusbh200", usb_debug_root);
- if (!fusbh200_debug_root) {
- retval = -ENOENT;
- goto err_debug;
- }
-
- retval = platform_driver_register(&fusbh200_hcd_fusbh200_driver);
- if (retval < 0)
- goto clean;
- return retval;
-
- platform_driver_unregister(&fusbh200_hcd_fusbh200_driver);
-clean:
- debugfs_remove(fusbh200_debug_root);
- fusbh200_debug_root = NULL;
-err_debug:
- clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
- return retval;
-}
-module_init(fusbh200_hcd_init);
-
-static void __exit fusbh200_hcd_cleanup(void)
-{
- platform_driver_unregister(&fusbh200_hcd_fusbh200_driver);
- debugfs_remove(fusbh200_debug_root);
- clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
-}
-module_exit(fusbh200_hcd_cleanup);
projects / linux-beck.git / commitdiff