This patch adds a UDC driver for Broadcom's USB3.0 Peripheral core named BDC.
BDC supports control traffic on ep0 and bulk/Int/Isoch traffic on all other
endpoints.
[ balbi@ti.com : fix build error on randconfig due to lack of
<linux/dmapool.h> ]
Signed-off-by: Ashwini Pahuja <ashwini.linux@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
dynamically linked module called "m66592_udc" and force all
gadget drivers to also be dynamically linked.
+source "drivers/usb/gadget/udc/bdc/Kconfig"
+
#
# Controllers available only in discrete form (and all PCI controllers)
#
obj-$(CONFIG_USB_MV_U3D) += mv_u3d_core.o
obj-$(CONFIG_USB_GR_UDC) += gr_udc.o
obj-$(CONFIG_USB_GADGET_XILINX) += udc-xilinx.o
+obj-$(CONFIG_USB_BDC_UDC) += bdc/
--- /dev/null
+config USB_BDC_UDC
+ tristate "Broadcom USB3.0 device controller IP driver(BDC)"
+ depends on USB_GADGET && HAS_DMA
+
+ help
+ BDC is Broadcom's USB3.0 device controller IP. If your SOC has a BDC IP
+ then select this driver.
+
+ Say "y" here to link the driver statically, or "m" to build a dynamically
+ linked module called "bdc".
+
+if USB_BDC_UDC
+
+comment "Platform Support"
+config USB_BDC_PCI
+ tristate "BDC support for PCIe based platforms"
+ depends on PCI
+ default USB_BDC_UDC
+ help
+ Enable support for platforms which have BDC connected through PCIe, such as Lego3 FPGA platform.
+endif
--- /dev/null
+obj-$(CONFIG_USB_BDC_UDC) += bdc.o
+bdc-y := bdc_core.o bdc_cmd.o bdc_ep.o bdc_udc.o
+
+ifneq ($(CONFIG_USB_GADGET_VERBOSE),)
+ bdc-y += bdc_dbg.o
+endif
+
+obj-$(CONFIG_USB_BDC_PCI) += bdc_pci.o
--- /dev/null
+/*
+ * bdc.h - header for the BRCM BDC USB3.0 device controller
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+
+#ifndef __LINUX_BDC_H__
+#define __LINUX_BDC_H__
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/debugfs.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <asm/unaligned.h>
+
+#define BRCM_BDC_NAME "bdc_usb3"
+#define BRCM_BDC_DESC "BDC device controller driver"
+
+#define DMA_ADDR_INVALID (~(dma_addr_t)0)
+
+/* BDC command operation timeout in usec*/
+#define BDC_CMD_TIMEOUT 1000
+/* BDC controller operation timeout in usec*/
+#define BDC_COP_TIMEOUT 500
+
+/*
+ * Maximum size of ep0 response buffer for ch9 requests,
+ * the set_sel request uses 6 so far, the max.
+*/
+#define EP0_RESPONSE_BUFF 6
+/* Start with SS as default */
+#define EP0_MAX_PKT_SIZE 512
+
+/* 64 entries in a SRR */
+#define NUM_SR_ENTRIES 64
+
+/* Num of bds per table */
+#define NUM_BDS_PER_TABLE 32
+
+/* Num of tables in bd list for control,bulk and Int ep */
+#define NUM_TABLES 2
+
+/* Num of tables in bd list for Isoch ep */
+#define NUM_TABLES_ISOCH 6
+
+/* U1 Timeout default: 248usec */
+#define U1_TIMEOUT 0xf8
+
+/* Interrupt coalescence in usec */
+#define INT_CLS 500
+
+/* Register offsets */
+/* Configuration and Capability registers */
+#define BDC_BDCCFG0 0x00
+#define BDC_BDCCFG1 0x04
+#define BDC_BDCCAP0 0x08
+#define BDC_BDCCAP1 0x0c
+#define BDC_CMDPAR0 0x10
+#define BDC_CMDPAR1 0x14
+#define BDC_CMDPAR2 0x18
+#define BDC_CMDSC 0x1c
+#define BDC_USPC 0x20
+#define BDC_USPPMS 0x28
+#define BDC_USPPM2 0x2c
+#define BDC_SPBBAL 0x38
+#define BDC_SPBBAH 0x3c
+#define BDC_BDCSC 0x40
+#define BDC_XSFNTF 0x4c
+
+#define BDC_DVCSA 0x50
+#define BDC_DVCSB 0x54
+#define BDC_EPSTS0(n) (0x60 + (n * 0x10))
+#define BDC_EPSTS1(n) (0x64 + (n * 0x10))
+#define BDC_EPSTS2(n) (0x68 + (n * 0x10))
+#define BDC_EPSTS3(n) (0x6c + (n * 0x10))
+#define BDC_EPSTS4(n) (0x70 + (n * 0x10))
+#define BDC_EPSTS5(n) (0x74 + (n * 0x10))
+#define BDC_EPSTS6(n) (0x78 + (n * 0x10))
+#define BDC_EPSTS7(n) (0x7c + (n * 0x10))
+#define BDC_SRRBAL(n) (0x200 + (n * 0x10))
+#define BDC_SRRBAH(n) (0x204 + (n * 0x10))
+#define BDC_SRRINT(n) (0x208 + (n * 0x10))
+#define BDC_INTCTLS(n) (0x20c + (n * 0x10))
+
+/* Extended capability regs */
+#define BDC_FSCNOC 0xcd4
+#define BDC_FSCNIC 0xce4
+#define NUM_NCS(p) (p >> 28)
+
+/* Register bit fields and Masks */
+/* BDC Configuration 0 */
+#define BDC_PGS(p) (((p) & (0x7 << 8)) >> 8)
+#define BDC_SPB(p) (p & 0x7)
+
+/* BDC Capability1 */
+#define BDC_P64 (1 << 0)
+
+/* BDC Command register */
+#define BDC_CMD_FH 0xe
+#define BDC_CMD_DNC 0x6
+#define BDC_CMD_EPO 0x4
+#define BDC_CMD_BLA 0x3
+#define BDC_CMD_EPC 0x2
+#define BDC_CMD_DVC 0x1
+#define BDC_CMD_CWS (0x1 << 5)
+#define BDC_CMD_CST(p) (((p) & (0xf << 6))>>6)
+#define BDC_CMD_EPN(p) ((p & 0x1f) << 10)
+#define BDC_SUB_CMD_ADD (0x1 << 17)
+#define BDC_SUB_CMD_FWK (0x4 << 17)
+/* Reset sequence number */
+#define BDC_CMD_EPO_RST_SN (0x1 << 16)
+#define BDC_CMD_EP0_XSD (0x1 << 16)
+#define BDC_SUB_CMD_ADD_EP (0x1 << 17)
+#define BDC_SUB_CMD_DRP_EP (0x2 << 17)
+#define BDC_SUB_CMD_EP_STP (0x2 << 17)
+#define BDC_SUB_CMD_EP_STL (0x4 << 17)
+#define BDC_SUB_CMD_EP_RST (0x1 << 17)
+#define BDC_CMD_SRD (1 << 27)
+
+/* CMD completion status */
+#define BDC_CMDS_SUCC 0x1
+#define BDC_CMDS_PARA 0x3
+#define BDC_CMDS_STAT 0x4
+#define BDC_CMDS_FAIL 0x5
+#define BDC_CMDS_INTL 0x6
+#define BDC_CMDS_BUSY 0xf
+
+/* CMDSC Param 2 shifts */
+#define EPT_SHIFT 22
+#define MP_SHIFT 10
+#define MB_SHIFT 6
+#define EPM_SHIFT 4
+
+/* BDC USPSC */
+#define BDC_VBC (1 << 31)
+#define BDC_PRC (1 << 30)
+#define BDC_PCE (1 << 29)
+#define BDC_CFC (1 << 28)
+#define BDC_PCC (1 << 27)
+#define BDC_PSC (1 << 26)
+#define BDC_VBS (1 << 25)
+#define BDC_PRS (1 << 24)
+#define BDC_PCS (1 << 23)
+#define BDC_PSP(p) (((p) & (0x7 << 20))>>20)
+#define BDC_SCN (1 << 8)
+#define BDC_SDC (1 << 7)
+#define BDC_SWS (1 << 4)
+
+#define BDC_USPSC_RW (BDC_SCN|BDC_SDC|BDC_SWS|0xf)
+#define BDC_PSP(p) (((p) & (0x7 << 20))>>20)
+
+#define BDC_SPEED_FS 0x1
+#define BDC_SPEED_LS 0x2
+#define BDC_SPEED_HS 0x3
+#define BDC_SPEED_SS 0x4
+
+#define BDC_PST(p) (p & 0xf)
+#define BDC_PST_MASK 0xf
+
+/* USPPMS */
+#define BDC_U2E (0x1 << 31)
+#define BDC_U1E (0x1 << 30)
+#define BDC_U2A (0x1 << 29)
+#define BDC_PORT_W1S (0x1 << 17)
+#define BDC_U1T(p) ((p) & 0xff)
+#define BDC_U2T(p) (((p) & 0xff) << 8)
+#define BDC_U1T_MASK 0xff
+
+/* USBPM2 */
+/* Hardware LPM Enable */
+#define BDC_HLE (1 << 16)
+
+/* BDC Status and Control */
+#define BDC_COP_RST (1 << 29)
+#define BDC_COP_RUN (2 << 29)
+#define BDC_COP_STP (4 << 29)
+
+#define BDC_COP_MASK (BDC_COP_RST|BDC_COP_RUN|BDC_COP_STP)
+
+#define BDC_COS (1 << 28)
+#define BDC_CSTS(p) (((p) & (0x7 << 20)) >> 20)
+#define BDC_MASK_MCW (1 << 7)
+#define BDC_GIE (1 << 1)
+#define BDC_GIP (1 << 0)
+
+#define BDC_HLT 1
+#define BDC_NOR 2
+#define BDC_OIP 7
+
+/* Buffer descriptor and Status report bit fields and masks */
+#define BD_TYPE_BITMASK (0xf)
+#define BD_CHAIN 0xf
+
+#define BD_TFS_SHIFT 4
+#define BD_SOT (1 << 26)
+#define BD_EOT (1 << 27)
+#define BD_ISP (1 << 29)
+#define BD_IOC (1 << 30)
+#define BD_SBF (1 << 31)
+
+#define BD_INTR_TARGET(p) (((p) & 0x1f) << 27)
+
+#define BDC_SRR_RWS (1 << 4)
+#define BDC_SRR_RST (1 << 3)
+#define BDC_SRR_ISR (1 << 2)
+#define BDC_SRR_IE (1 << 1)
+#define BDC_SRR_IP (1 << 0)
+#define BDC_SRR_EPI(p) (((p) & (0xff << 24)) >> 24)
+#define BDC_SRR_DPI(p) (((p) & (0xff << 16)) >> 16)
+#define BDC_SRR_DPI_MASK 0x00ff0000
+
+#define MARK_CHAIN_BD (BD_CHAIN|BD_EOT|BD_SOT)
+
+/* Control transfer BD specific fields */
+#define BD_DIR_IN (1 << 25)
+
+#define BDC_PTC_MASK 0xf0000000
+
+/* status report defines */
+#define SR_XSF 0
+#define SR_USPC 4
+#define SR_BD_LEN(p) (p & 0xffffff)
+
+#define XSF_SUCC 0x1
+#define XSF_SHORT 0x3
+#define XSF_BABB 0x4
+#define XSF_SETUP_RECV 0x6
+#define XSF_DATA_START 0x7
+#define XSF_STATUS_START 0x8
+
+#define XSF_STS(p) (((p) >> 28) & 0xf)
+
+/* Transfer BD fields */
+#define BD_LEN(p) ((p) & 0x1ffff)
+#define BD_LTF (1 << 25)
+#define BD_TYPE_DS 0x1
+#define BD_TYPE_SS 0x2
+
+#define BDC_EP_ENABLED (1 << 0)
+#define BDC_EP_STALL (1 << 1)
+#define BDC_EP_STOP (1 << 2)
+
+/* One BD can transfer max 65536 bytes */
+#define BD_MAX_BUFF_SIZE (1 << 16)
+/* Maximum bytes in one XFR, Refer to BDC spec */
+#define MAX_XFR_LEN 16777215
+
+/* defines for Force Header command */
+#define DEV_NOTF_TYPE 6
+#define FWK_SUBTYPE 1
+#define TRA_PACKET 4
+
+#define to_bdc_ep(e) container_of(e, struct bdc_ep, usb_ep)
+#define to_bdc_req(r) container_of(r, struct bdc_req, usb_req)
+#define gadget_to_bdc(g) container_of(g, struct bdc, gadget)
+
+/* FUNCTION WAKE DEV NOTIFICATION interval, USB3 spec table 8.13 */
+#define BDC_TNOTIFY 2500 /*in ms*/
+/* Devstatus bitfields */
+#define REMOTE_WAKEUP_ISSUED (1 << 16)
+#define DEVICE_SUSPENDED (1 << 17)
+#define FUNC_WAKE_ISSUED (1 << 18)
+#define REMOTE_WAKE_ENABLE (1 << USB_DEVICE_REMOTE_WAKEUP)
+
+/* On disconnect, preserve these bits and clear rest */
+#define DEVSTATUS_CLEAR (1 << USB_DEVICE_SELF_POWERED)
+/* Hardware and software Data structures */
+
+/* Endpoint bd: buffer descriptor */
+struct bdc_bd {
+ __le32 offset[4];
+};
+
+/* Status report in Status report ring(srr) */
+struct bdc_sr {
+ __le32 offset[4];
+};
+
+/* bd_table: contigous bd's in a table */
+struct bd_table {
+ struct bdc_bd *start_bd;
+ /* dma address of start bd of table*/
+ dma_addr_t dma;
+};
+
+/*
+ * Each endpoint has a bdl(buffer descriptor list), bdl consists of 1 or more bd
+ * table's chained to each other through a chain bd, every table has equal
+ * number of bds. the software uses bdi(bd index) to refer to particular bd in
+ * the list.
+ */
+struct bd_list {
+ /* Array of bd table pointers*/
+ struct bd_table **bd_table_array;
+ /* How many tables chained to each other */
+ int num_tabs;
+ /* Max_bdi = num_tabs * num_bds_table - 1 */
+ int max_bdi;
+ /* current enq bdi from sw point of view */
+ int eqp_bdi;
+ /* current deq bdi from sw point of view */
+ int hwd_bdi;
+ /* numbers of bds per table */
+ int num_bds_table;
+};
+
+struct bdc_req;
+
+/* Representation of a transfer, one transfer can have multiple bd's */
+struct bd_transfer {
+ struct bdc_req *req;
+ /* start bd index */
+ int start_bdi;
+ /* this will be the next hw dqp when this transfer completes */
+ int next_hwd_bdi;
+ /* number of bds in this transfer */
+ int num_bds;
+};
+
+/*
+ * Representation of a gadget request, every gadget request is contained
+ * by 1 bd_transfer.
+ */
+struct bdc_req {
+ struct usb_request usb_req;
+ struct list_head queue;
+ struct bdc_ep *ep;
+ /* only one Transfer per request */
+ struct bd_transfer bd_xfr;
+ int epnum;
+};
+
+/* scratchpad buffer needed by bdc hardware */
+struct bdc_scratchpad {
+ dma_addr_t sp_dma;
+ void *buff;
+ u32 size;
+};
+
+/* endpoint representation */
+struct bdc_ep {
+ struct usb_ep usb_ep;
+ struct list_head queue;
+ struct bdc *bdc;
+ u8 ep_type;
+ u8 dir;
+ u8 ep_num;
+ const struct usb_ss_ep_comp_descriptor *comp_desc;
+ const struct usb_endpoint_descriptor *desc;
+ unsigned int flags;
+ char name[20];
+ /* endpoint bd list*/
+ struct bd_list bd_list;
+ /*
+ * HW generates extra event for multi bd tranfers, this flag helps in
+ * ignoring the extra event
+ */
+ bool ignore_next_sr;
+};
+
+/* bdc cmmand parameter structure */
+struct bdc_cmd_params {
+ u32 param2;
+ u32 param1;
+ u32 param0;
+};
+
+/* status report ring(srr), currently one srr is supported for entire system */
+struct srr {
+ struct bdc_sr *sr_bds;
+ u16 eqp_index;
+ u16 dqp_index;
+ dma_addr_t dma_addr;
+};
+
+/* EP0 states */
+enum bdc_ep0_state {
+ WAIT_FOR_SETUP = 0,
+ WAIT_FOR_DATA_START,
+ WAIT_FOR_DATA_XMIT,
+ WAIT_FOR_STATUS_START,
+ WAIT_FOR_STATUS_XMIT,
+ STATUS_PENDING
+};
+
+/* Link states */
+enum bdc_link_state {
+ BDC_LINK_STATE_U0 = 0x00,
+ BDC_LINK_STATE_U3 = 0x03,
+ BDC_LINK_STATE_RX_DET = 0x05,
+ BDC_LINK_STATE_RESUME = 0x0f
+};
+
+/* representation of bdc */
+struct bdc {
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *gadget_driver;
+ struct device *dev;
+ /* device lock */
+ spinlock_t lock;
+
+ /* num of endpoints for a particular instantiation of IP */
+ unsigned int num_eps;
+ /*
+ * Array of ep's, it uses the same index covention as bdc hw i.e.
+ * 1 for ep0, 2 for 1out,3 for 1in ....
+ */
+ struct bdc_ep **bdc_ep_array;
+ void __iomem *regs;
+ struct bdc_scratchpad scratchpad;
+ u32 sp_buff_size;
+ /* current driver supports 1 status ring */
+ struct srr srr;
+ /* Last received setup packet */
+ struct usb_ctrlrequest setup_pkt;
+ struct bdc_req ep0_req;
+ struct bdc_req status_req;
+ enum bdc_ep0_state ep0_state;
+ bool delayed_status;
+ bool zlp_needed;
+ bool reinit;
+ bool pullup;
+ /* Bits 0-15 are standard and 16-31 for proprietary information */
+ u32 devstatus;
+ int irq;
+ void *mem;
+ u32 dev_addr;
+ /* DMA pools */
+ struct dma_pool *bd_table_pool;
+ u8 test_mode;
+ /* array of callbacks for various status report handlers */
+ void (*sr_handler[2])(struct bdc *, struct bdc_sr *);
+ /* ep0 callback handlers */
+ void (*sr_xsf_ep0[3])(struct bdc *, struct bdc_sr *);
+ /* ep0 response buffer for ch9 requests like GET_STATUS and SET_SEL */
+ unsigned char ep0_response_buff[EP0_RESPONSE_BUFF];
+ /*
+ * Timer to check if host resumed transfer after bdc sent Func wake
+ * notification packet after a remote wakeup. if not, then resend the
+ * Func Wake packet every 2.5 secs. Refer to USB3 spec section 8.5.6.4
+ */
+ struct delayed_work func_wake_notify;
+};
+
+static inline u32 bdc_readl(void __iomem *base, u32 offset)
+{
+ return readl(base + offset);
+}
+
+static inline void bdc_writel(void __iomem *base, u32 offset, u32 value)
+{
+ writel(value, base + offset);
+}
+
+/* Buffer descriptor list operations */
+void bdc_notify_xfr(struct bdc *, u32);
+void bdc_softconn(struct bdc *);
+void bdc_softdisconn(struct bdc *);
+int bdc_run(struct bdc *);
+int bdc_stop(struct bdc *);
+int bdc_reset(struct bdc *);
+int bdc_udc_init(struct bdc *);
+void bdc_udc_exit(struct bdc *);
+int bdc_reinit(struct bdc *);
+
+/* Status report handlers */
+/* Upstream port status change sr */
+void bdc_sr_uspc(struct bdc *, struct bdc_sr *);
+/* transfer sr */
+void bdc_sr_xsf(struct bdc *, struct bdc_sr *);
+/* EP0 XSF handlers */
+void bdc_xsf_ep0_setup_recv(struct bdc *, struct bdc_sr *);
+void bdc_xsf_ep0_data_start(struct bdc *, struct bdc_sr *);
+void bdc_xsf_ep0_status_start(struct bdc *, struct bdc_sr *);
+
+#endif /* __LINUX_BDC_H__ */
--- /dev/null
+/*
+ * bdc_cmd.c - BRCM BDC USB3.0 device controller
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+
+#include "bdc.h"
+#include "bdc_cmd.h"
+#include "bdc_dbg.h"
+
+/* Issues a cmd to cmd processor and waits for cmd completion */
+static int bdc_issue_cmd(struct bdc *bdc, u32 cmd_sc, u32 param0,
+ u32 param1, u32 param2)
+{
+ u32 timeout = BDC_CMD_TIMEOUT;
+ u32 cmd_status;
+ u32 temp;
+
+ bdc_writel(bdc->regs, BDC_CMDPAR0, param0);
+ bdc_writel(bdc->regs, BDC_CMDPAR1, param1);
+ bdc_writel(bdc->regs, BDC_CMDPAR2, param2);
+
+ /* Issue the cmd */
+ /* Make sure the cmd params are written before asking HW to exec cmd */
+ wmb();
+ bdc_writel(bdc->regs, BDC_CMDSC, cmd_sc | BDC_CMD_CWS | BDC_CMD_SRD);
+ do {
+ temp = bdc_readl(bdc->regs, BDC_CMDSC);
+ dev_dbg_ratelimited(bdc->dev, "cmdsc=%x", temp);
+ cmd_status = BDC_CMD_CST(temp);
+ if (cmd_status != BDC_CMDS_BUSY) {
+ dev_dbg(bdc->dev,
+ "command completed cmd_sts:%x\n", cmd_status);
+ return cmd_status;
+ }
+ udelay(1);
+ } while (timeout--);
+
+ dev_err(bdc->dev,
+ "command operation timedout cmd_status=%d\n", cmd_status);
+
+ return cmd_status;
+}
+
+/* Submits cmd and analyze the return value of bdc_issue_cmd */
+static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
+ u32 param0, u32 param1, u32 param2)
+{
+ u32 temp, cmd_status;
+ int reset_bdc = 0;
+ int ret;
+
+ temp = bdc_readl(bdc->regs, BDC_CMDSC);
+ dev_dbg(bdc->dev,
+ "%s:CMDSC:%08x cmdsc:%08x param0=%08x param1=%08x param2=%08x\n",
+ __func__, temp, cmd_sc, param0, param1, param2);
+
+ cmd_status = BDC_CMD_CST(temp);
+ if (cmd_status == BDC_CMDS_BUSY) {
+ dev_err(bdc->dev, "command processor busy: %x\n", cmd_status);
+ return -EBUSY;
+ }
+ ret = bdc_issue_cmd(bdc, cmd_sc, param0, param1, param2);
+ switch (ret) {
+ case BDC_CMDS_SUCC:
+ dev_dbg(bdc->dev, "command completed successfully\n");
+ ret = 0;
+ break;
+
+ case BDC_CMDS_PARA:
+ dev_err(bdc->dev, "command parameter error\n");
+ ret = -EINVAL;
+ break;
+
+ case BDC_CMDS_STAT:
+ dev_err(bdc->dev, "Invalid device/ep state\n");
+ ret = -EINVAL;
+ break;
+
+ case BDC_CMDS_FAIL:
+ dev_err(bdc->dev, "Command failed?\n");
+ ret = -EAGAIN;
+ break;
+
+ case BDC_CMDS_INTL:
+ dev_err(bdc->dev, "BDC Internal error\n");
+ reset_bdc = 1;
+ ret = -ECONNRESET;
+ break;
+
+ case BDC_CMDS_BUSY:
+ dev_err(bdc->dev,
+ "command timedout waited for %dusec\n",
+ BDC_CMD_TIMEOUT);
+ reset_bdc = 1;
+ ret = -ECONNRESET;
+ break;
+ default:
+ dev_dbg(bdc->dev, "Unknown command completion code:%x\n", ret);
+ }
+
+ return ret;
+}
+
+/* Deconfigure the endpoint from HW */
+int bdc_dconfig_ep(struct bdc *bdc, struct bdc_ep *ep)
+{
+ u32 cmd_sc;
+
+ cmd_sc = BDC_SUB_CMD_DRP_EP|BDC_CMD_EPN(ep->ep_num)|BDC_CMD_EPC;
+ dev_dbg(bdc->dev, "%s ep->ep_num =%d cmd_sc=%x\n", __func__,
+ ep->ep_num, cmd_sc);
+
+ return bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
+}
+
+/* Reinitalize the bdlist after config ep command */
+static void ep_bd_list_reinit(struct bdc_ep *ep)
+{
+ struct bdc *bdc = ep->bdc;
+ struct bdc_bd *bd;
+
+ ep->bd_list.eqp_bdi = 0;
+ ep->bd_list.hwd_bdi = 0;
+ bd = ep->bd_list.bd_table_array[0]->start_bd;
+ dev_dbg(bdc->dev, "%s ep:%p bd:%p\n", __func__, ep, bd);
+ memset(bd, 0, sizeof(struct bdc_bd));
+ bd->offset[3] |= cpu_to_le32(BD_SBF);
+}
+
+/* Configure an endpoint */
+int bdc_config_ep(struct bdc *bdc, struct bdc_ep *ep)
+{
+ const struct usb_ss_ep_comp_descriptor *comp_desc;
+ const struct usb_endpoint_descriptor *desc;
+ u32 param0, param1, param2, cmd_sc;
+ u32 mps, mbs, mul, si;
+ int ret;
+
+ desc = ep->desc;
+ comp_desc = ep->comp_desc;
+ cmd_sc = mul = mbs = param2 = 0;
+ param0 = lower_32_bits(ep->bd_list.bd_table_array[0]->dma);
+ param1 = upper_32_bits(ep->bd_list.bd_table_array[0]->dma);
+ cpu_to_le32s(¶m0);
+ cpu_to_le32s(¶m1);
+
+ dev_dbg(bdc->dev, "%s: param0=%08x param1=%08x",
+ __func__, param0, param1);
+ si = desc->bInterval;
+ si = clamp_val(si, 1, 16) - 1;
+
+ mps = usb_endpoint_maxp(desc);
+ mps &= 0x7ff;
+ param2 |= mps << MP_SHIFT;
+ param2 |= usb_endpoint_type(desc) << EPT_SHIFT;
+
+ switch (bdc->gadget.speed) {
+ case USB_SPEED_SUPER:
+ if (usb_endpoint_xfer_int(desc) ||
+ usb_endpoint_xfer_isoc(desc)) {
+ param2 |= si;
+ if (usb_endpoint_xfer_isoc(desc) && comp_desc)
+ mul = comp_desc->bmAttributes;
+
+ }
+ param2 |= mul << EPM_SHIFT;
+ if (comp_desc)
+ mbs = comp_desc->bMaxBurst;
+ param2 |= mbs << MB_SHIFT;
+ break;
+
+ case USB_SPEED_HIGH:
+ if (usb_endpoint_xfer_isoc(desc) ||
+ usb_endpoint_xfer_int(desc)) {
+ param2 |= si;
+
+ mbs = (usb_endpoint_maxp(desc) & 0x1800) >> 11;
+ param2 |= mbs << MB_SHIFT;
+ }
+ break;
+
+ case USB_SPEED_FULL:
+ case USB_SPEED_LOW:
+ /* the hardware accepts SI in 125usec range */
+ if (usb_endpoint_xfer_isoc(desc))
+ si += 3;
+
+ /*
+ * FS Int endpoints can have si of 1-255ms but the controller
+ * accepts 2^bInterval*125usec, so convert ms to nearest power
+ * of 2
+ */
+ if (usb_endpoint_xfer_int(desc))
+ si = fls(desc->bInterval * 8) - 1;
+
+ param2 |= si;
+ break;
+ default:
+ dev_err(bdc->dev, "UNKNOWN speed ERR\n");
+ return -EINVAL;
+ }
+
+ cmd_sc |= BDC_CMD_EPC|BDC_CMD_EPN(ep->ep_num)|BDC_SUB_CMD_ADD_EP;
+
+ dev_dbg(bdc->dev, "cmd_sc=%x param2=%08x\n", cmd_sc, param2);
+ ret = bdc_submit_cmd(bdc, cmd_sc, param0, param1, param2);
+ if (ret) {
+ dev_err(bdc->dev, "command failed :%x\n", ret);
+ return ret;
+ }
+ ep_bd_list_reinit(ep);
+
+ return ret;
+}
+
+/*
+ * Change the HW deq pointer, if this command is successful, HW will start
+ * fetching the next bd from address dma_addr.
+ */
+int bdc_ep_bla(struct bdc *bdc, struct bdc_ep *ep, dma_addr_t dma_addr)
+{
+ u32 param0, param1;
+ u32 cmd_sc = 0;
+
+ dev_dbg(bdc->dev, "%s: add=%08llx\n", __func__,
+ (unsigned long long)(dma_addr));
+ param0 = lower_32_bits(dma_addr);
+ param1 = upper_32_bits(dma_addr);
+ cpu_to_le32s(¶m0);
+ cpu_to_le32s(¶m1);
+
+ cmd_sc |= BDC_CMD_EPN(ep->ep_num)|BDC_CMD_BLA;
+ dev_dbg(bdc->dev, "cmd_sc=%x\n", cmd_sc);
+
+ return bdc_submit_cmd(bdc, cmd_sc, param0, param1, 0);
+}
+
+/* Set the address sent bu Host in SET_ADD request */
+int bdc_address_device(struct bdc *bdc, u32 add)
+{
+ u32 cmd_sc = 0;
+ u32 param2;
+
+ dev_dbg(bdc->dev, "%s: add=%d\n", __func__, add);
+ cmd_sc |= BDC_SUB_CMD_ADD|BDC_CMD_DVC;
+ param2 = add & 0x7f;
+
+ return bdc_submit_cmd(bdc, cmd_sc, 0, 0, param2);
+}
+
+/* Send a Function Wake notification packet using FH command */
+int bdc_function_wake_fh(struct bdc *bdc, u8 intf)
+{
+ u32 param0, param1;
+ u32 cmd_sc = 0;
+
+ param0 = param1 = 0;
+ dev_dbg(bdc->dev, "%s intf=%d\n", __func__, intf);
+ cmd_sc |= BDC_CMD_FH;
+ param0 |= TRA_PACKET;
+ param0 |= (bdc->dev_addr << 25);
+ param1 |= DEV_NOTF_TYPE;
+ param1 |= (FWK_SUBTYPE<<4);
+ dev_dbg(bdc->dev, "param0=%08x param1=%08x\n", param0, param1);
+
+ return bdc_submit_cmd(bdc, cmd_sc, param0, param1, 0);
+}
+
+/* Send a Function Wake notification packet using DNC command */
+int bdc_function_wake(struct bdc *bdc, u8 intf)
+{
+ u32 cmd_sc = 0;
+ u32 param2 = 0;
+
+ dev_dbg(bdc->dev, "%s intf=%d", __func__, intf);
+ param2 |= intf;
+ cmd_sc |= BDC_SUB_CMD_FWK|BDC_CMD_DNC;
+
+ return bdc_submit_cmd(bdc, cmd_sc, 0, 0, param2);
+}
+
+/* Stall the endpoint */
+int bdc_ep_set_stall(struct bdc *bdc, int epnum)
+{
+ u32 cmd_sc = 0;
+
+ dev_dbg(bdc->dev, "%s epnum=%d\n", __func__, epnum);
+ /* issue a stall endpoint command */
+ cmd_sc |= BDC_SUB_CMD_EP_STL | BDC_CMD_EPN(epnum) | BDC_CMD_EPO;
+
+ return bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
+}
+
+/* resets the endpoint, called when host sends CLEAR_FEATURE(HALT) */
+int bdc_ep_clear_stall(struct bdc *bdc, int epnum)
+{
+ struct bdc_ep *ep;
+ u32 cmd_sc = 0;
+ int ret;
+
+ dev_dbg(bdc->dev, "%s: epnum=%d\n", __func__, epnum);
+ ep = bdc->bdc_ep_array[epnum];
+ /*
+ * If we are not in stalled then stall Endpoint and issue clear stall,
+ * his will reset the seq number for non EP0.
+ */
+ if (epnum != 1) {
+ /* if the endpoint it not stallled */
+ if (!(ep->flags & BDC_EP_STALL)) {
+ ret = bdc_ep_set_stall(bdc, epnum);
+ if (ret)
+ return ret;
+ }
+ }
+ /* Preserve the seq number for ep0 only */
+ if (epnum != 1)
+ cmd_sc |= BDC_CMD_EPO_RST_SN;
+
+ /* issue a reset endpoint command */
+ cmd_sc |= BDC_SUB_CMD_EP_RST | BDC_CMD_EPN(epnum) | BDC_CMD_EPO;
+
+ ret = bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
+ if (ret) {
+ dev_err(bdc->dev, "command failed:%x\n", ret);
+ return ret;
+ }
+ bdc_notify_xfr(bdc, epnum);
+
+ return ret;
+}
+
+/* Stop the endpoint, called when software wants to dequeue some request */
+int bdc_stop_ep(struct bdc *bdc, int epnum)
+{
+ struct bdc_ep *ep;
+ u32 cmd_sc = 0;
+ int ret;
+
+ ep = bdc->bdc_ep_array[epnum];
+ dev_dbg(bdc->dev, "%s: ep:%s ep->flags:%08x\n", __func__,
+ ep->name, ep->flags);
+ /* Endpoint has to be in running state to execute stop ep command */
+ if (!(ep->flags & BDC_EP_ENABLED)) {
+ dev_err(bdc->dev, "stop endpoint called for disabled ep\n");
+ return -EINVAL;
+ }
+ if ((ep->flags & BDC_EP_STALL) || (ep->flags & BDC_EP_STOP))
+ return 0;
+
+ /* issue a stop endpoint command */
+ cmd_sc |= BDC_CMD_EP0_XSD | BDC_SUB_CMD_EP_STP
+ | BDC_CMD_EPN(epnum) | BDC_CMD_EPO;
+
+ ret = bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
+ if (ret) {
+ dev_err(bdc->dev,
+ "stop endpoint command didn't complete:%d ep:%s\n",
+ ret, ep->name);
+ return ret;
+ }
+ ep->flags |= BDC_EP_STOP;
+ bdc_dump_epsts(bdc);
+
+ return ret;
+}
--- /dev/null
+/*
+ * bdc_cmd.h - header for the BDC debug functions
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+#ifndef __LINUX_BDC_CMD_H__
+#define __LINUX_BDC_CMD_H__
+
+/* Command operations */
+int bdc_address_device(struct bdc *, u32);
+int bdc_config_ep(struct bdc *, struct bdc_ep *);
+int bdc_dconfig_ep(struct bdc *, struct bdc_ep *);
+int bdc_stop_ep(struct bdc *, int);
+int bdc_ep_set_stall(struct bdc *, int);
+int bdc_ep_clear_stall(struct bdc *, int);
+int bdc_ep_set_halt(struct bdc_ep *, u32 , int);
+int bdc_ep_bla(struct bdc *, struct bdc_ep *, dma_addr_t);
+int bdc_function_wake(struct bdc*, u8);
+int bdc_function_wake_fh(struct bdc*, u8);
+
+#endif /* __LINUX_BDC_CMD_H__ */
--- /dev/null
+/*
+ * bdc_core.c - BRCM BDC USB3.0 device controller core operations
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/of.h>
+#include <linux/moduleparam.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include "bdc.h"
+#include "bdc_dbg.h"
+
+/* Poll till controller status is not OIP */
+static int poll_oip(struct bdc *bdc, int usec)
+{
+ u32 status;
+ /* Poll till STS!= OIP */
+ while (usec) {
+ status = bdc_readl(bdc->regs, BDC_BDCSC);
+ if (BDC_CSTS(status) != BDC_OIP) {
+ dev_dbg(bdc->dev,
+ "poll_oip complete status=%d",
+ BDC_CSTS(status));
+ return 0;
+ }
+ udelay(10);
+ usec -= 10;
+ }
+ dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status);
+
+ return -ETIMEDOUT;
+}
+
+/* Stop the BDC controller */
+int bdc_stop(struct bdc *bdc)
+{
+ int ret;
+ u32 temp;
+
+ dev_dbg(bdc->dev, "%s ()\n\n", __func__);
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ /* Check if BDC is already halted */
+ if (BDC_CSTS(temp) == BDC_HLT) {
+ dev_vdbg(bdc->dev, "BDC already halted\n");
+ return 0;
+ }
+ temp &= ~BDC_COP_MASK;
+ temp |= BDC_COS|BDC_COP_STP;
+ bdc_writel(bdc->regs, BDC_BDCSC, temp);
+
+ ret = poll_oip(bdc, BDC_COP_TIMEOUT);
+ if (ret)
+ dev_err(bdc->dev, "bdc stop operation failed");
+
+ return ret;
+}
+
+/* Issue a reset to BDC controller */
+int bdc_reset(struct bdc *bdc)
+{
+ u32 temp;
+ int ret;
+
+ dev_dbg(bdc->dev, "%s ()\n", __func__);
+ /* First halt the controller */
+ ret = bdc_stop(bdc);
+ if (ret)
+ return ret;
+
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ temp &= ~BDC_COP_MASK;
+ temp |= BDC_COS|BDC_COP_RST;
+ bdc_writel(bdc->regs, BDC_BDCSC, temp);
+ ret = poll_oip(bdc, BDC_COP_TIMEOUT);
+ if (ret)
+ dev_err(bdc->dev, "bdc reset operation failed");
+
+ return ret;
+}
+
+/* Run the BDC controller */
+int bdc_run(struct bdc *bdc)
+{
+ u32 temp;
+ int ret;
+
+ dev_dbg(bdc->dev, "%s ()\n", __func__);
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ /* if BDC is already in running state then do not do anything */
+ if (BDC_CSTS(temp) == BDC_NOR) {
+ dev_warn(bdc->dev, "bdc is already in running state\n");
+ return 0;
+ }
+ temp &= ~BDC_COP_MASK;
+ temp |= BDC_COP_RUN;
+ temp |= BDC_COS;
+ bdc_writel(bdc->regs, BDC_BDCSC, temp);
+ ret = poll_oip(bdc, BDC_COP_TIMEOUT);
+ if (ret) {
+ dev_err(bdc->dev, "bdc run operation failed:%d", ret);
+ return ret;
+ }
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ if (BDC_CSTS(temp) != BDC_NOR) {
+ dev_err(bdc->dev, "bdc not in normal mode after RUN op :%d\n",
+ BDC_CSTS(temp));
+ return -ESHUTDOWN;
+ }
+
+ return 0;
+}
+
+/*
+ * Present the termination to the host, typically called from upstream port
+ * event with Vbus present =1
+ */
+void bdc_softconn(struct bdc *bdc)
+{
+ u32 uspc;
+
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ uspc &= ~BDC_PST_MASK;
+ uspc |= BDC_LINK_STATE_RX_DET;
+ uspc |= BDC_SWS;
+ dev_dbg(bdc->dev, "%s () uspc=%08x\n", __func__, uspc);
+ bdc_writel(bdc->regs, BDC_USPC, uspc);
+}
+
+/* Remove the termination */
+void bdc_softdisconn(struct bdc *bdc)
+{
+ u32 uspc;
+
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ uspc |= BDC_SDC;
+ uspc &= ~BDC_SCN;
+ dev_dbg(bdc->dev, "%s () uspc=%x\n", __func__, uspc);
+ bdc_writel(bdc->regs, BDC_USPC, uspc);
+}
+
+/* Set up the scratchpad buffer array and scratchpad buffers, if needed. */
+static int scratchpad_setup(struct bdc *bdc)
+{
+ int sp_buff_size;
+ u32 low32;
+ u32 upp32;
+
+ sp_buff_size = BDC_SPB(bdc_readl(bdc->regs, BDC_BDCCFG0));
+ dev_dbg(bdc->dev, "%s() sp_buff_size=%d\n", __func__, sp_buff_size);
+ if (!sp_buff_size) {
+ dev_dbg(bdc->dev, "Scratchpad buffer not needed\n");
+ return 0;
+ }
+ /* Refer to BDC spec, Table 4 for description of SPB */
+ sp_buff_size = 1 << (sp_buff_size + 5);
+ dev_dbg(bdc->dev, "Allocating %d bytes for scratchpad\n", sp_buff_size);
+ bdc->scratchpad.buff = dma_zalloc_coherent(bdc->dev, sp_buff_size,
+ &bdc->scratchpad.sp_dma, GFP_KERNEL);
+
+ if (!bdc->scratchpad.buff)
+ goto fail;
+
+ bdc->sp_buff_size = sp_buff_size;
+ bdc->scratchpad.size = sp_buff_size;
+ low32 = lower_32_bits(bdc->scratchpad.sp_dma);
+ upp32 = upper_32_bits(bdc->scratchpad.sp_dma);
+ cpu_to_le32s(&low32);
+ cpu_to_le32s(&upp32);
+ bdc_writel(bdc->regs, BDC_SPBBAL, low32);
+ bdc_writel(bdc->regs, BDC_SPBBAH, upp32);
+ return 0;
+
+fail:
+ bdc->scratchpad.buff = NULL;
+
+ return -ENOMEM;
+}
+
+/* Allocate the status report ring */
+static int setup_srr(struct bdc *bdc, int interrupter)
+{
+ dev_dbg(bdc->dev, "%s() NUM_SR_ENTRIES:%d\n", __func__, NUM_SR_ENTRIES);
+ /* Reset the SRR */
+ bdc_writel(bdc->regs, BDC_SRRINT(0), BDC_SRR_RWS | BDC_SRR_RST);
+ bdc->srr.dqp_index = 0;
+ /* allocate the status report descriptors */
+ bdc->srr.sr_bds = dma_zalloc_coherent(
+ bdc->dev,
+ NUM_SR_ENTRIES * sizeof(struct bdc_bd),
+ &bdc->srr.dma_addr,
+ GFP_KERNEL);
+ if (!bdc->srr.sr_bds)
+ return -ENOMEM;
+
+ return 0;
+}
+
+/* Initialize the HW regs and internal data structures */
+static void bdc_mem_init(struct bdc *bdc, bool reinit)
+{
+ u8 size = 0;
+ u32 usb2_pm;
+ u32 low32;
+ u32 upp32;
+ u32 temp;
+
+ dev_dbg(bdc->dev, "%s ()\n", __func__);
+ bdc->ep0_state = WAIT_FOR_SETUP;
+ bdc->dev_addr = 0;
+ bdc->srr.eqp_index = 0;
+ bdc->srr.dqp_index = 0;
+ bdc->zlp_needed = false;
+ bdc->delayed_status = false;
+
+ bdc_writel(bdc->regs, BDC_SPBBAL, bdc->scratchpad.sp_dma);
+ /* Init the SRR */
+ temp = BDC_SRR_RWS | BDC_SRR_RST;
+ /* Reset the SRR */
+ bdc_writel(bdc->regs, BDC_SRRINT(0), temp);
+ dev_dbg(bdc->dev, "bdc->srr.sr_bds =%p\n", bdc->srr.sr_bds);
+ temp = lower_32_bits(bdc->srr.dma_addr);
+ size = fls(NUM_SR_ENTRIES) - 2;
+ temp |= size;
+ dev_dbg(bdc->dev, "SRRBAL[0]=%08x NUM_SR_ENTRIES:%d size:%d\n",
+ temp, NUM_SR_ENTRIES, size);
+
+ low32 = lower_32_bits(temp);
+ upp32 = upper_32_bits(bdc->srr.dma_addr);
+ cpu_to_le32s(&low32);
+ cpu_to_le32s(&upp32);
+
+ /* Write the dma addresses into regs*/
+ bdc_writel(bdc->regs, BDC_SRRBAL(0), low32);
+ bdc_writel(bdc->regs, BDC_SRRBAH(0), upp32);
+
+ temp = bdc_readl(bdc->regs, BDC_SRRINT(0));
+ temp |= BDC_SRR_IE;
+ temp &= ~(BDC_SRR_RST | BDC_SRR_RWS);
+ bdc_writel(bdc->regs, BDC_SRRINT(0), temp);
+
+ /* Set the Interrupt Coalescence ~500 usec */
+ temp = bdc_readl(bdc->regs, BDC_INTCTLS(0));
+ temp &= ~0xffff;
+ temp |= INT_CLS;
+ bdc_writel(bdc->regs, BDC_INTCTLS(0), temp);
+
+ usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
+ dev_dbg(bdc->dev, "usb2_pm=%08x", usb2_pm);
+ /* Enable hardware LPM Enable */
+ usb2_pm |= BDC_HLE;
+ bdc_writel(bdc->regs, BDC_USPPM2, usb2_pm);
+
+ /* readback for debug */
+ usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
+ dev_dbg(bdc->dev, "usb2_pm=%08x\n", usb2_pm);
+
+ /* Disable any unwanted SR's on SRR */
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ /* We don't want Microframe counter wrap SR */
+ temp |= BDC_MASK_MCW;
+ bdc_writel(bdc->regs, BDC_BDCSC, temp);
+
+ /*
+ * In some error cases, driver has to reset the entire BDC controller
+ * in that case reinit is passed as 1
+ */
+ if (reinit) {
+ /* Enable interrupts */
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ temp |= BDC_GIE;
+ bdc_writel(bdc->regs, BDC_BDCSC, temp);
+ /* Init scratchpad to 0 */
+ memset(bdc->scratchpad.buff, 0, bdc->sp_buff_size);
+ /* Initialize SRR to 0 */
+ memset(bdc->srr.sr_bds, 0,
+ NUM_SR_ENTRIES * sizeof(struct bdc_bd));
+ } else {
+ /* One time initiaization only */
+ /* Enable status report function pointers */
+ bdc->sr_handler[0] = bdc_sr_xsf;
+ bdc->sr_handler[1] = bdc_sr_uspc;
+
+ /* EP0 status report function pointers */
+ bdc->sr_xsf_ep0[0] = bdc_xsf_ep0_setup_recv;
+ bdc->sr_xsf_ep0[1] = bdc_xsf_ep0_data_start;
+ bdc->sr_xsf_ep0[2] = bdc_xsf_ep0_status_start;
+ }
+}
+
+/* Free the dynamic memory */
+static void bdc_mem_free(struct bdc *bdc)
+{
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ /* Free SRR */
+ if (bdc->srr.sr_bds)
+ dma_free_coherent(bdc->dev,
+ NUM_SR_ENTRIES * sizeof(struct bdc_bd),
+ bdc->srr.sr_bds, bdc->srr.dma_addr);
+
+ /* Free scratchpad */
+ if (bdc->scratchpad.buff)
+ dma_free_coherent(bdc->dev, bdc->sp_buff_size,
+ bdc->scratchpad.buff, bdc->scratchpad.sp_dma);
+
+ /* Destroy the dma pools */
+ if (bdc->bd_table_pool)
+ dma_pool_destroy(bdc->bd_table_pool);
+
+ /* Free the bdc_ep array */
+ kfree(bdc->bdc_ep_array);
+
+ bdc->srr.sr_bds = NULL;
+ bdc->scratchpad.buff = NULL;
+ bdc->bd_table_pool = NULL;
+ bdc->bdc_ep_array = NULL;
+}
+
+/*
+ * bdc reinit gives a controller reset and reinitialize the registers,
+ * called from disconnect/bus reset scenario's, to ensure proper HW cleanup
+ */
+int bdc_reinit(struct bdc *bdc)
+{
+ int ret;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ ret = bdc_stop(bdc);
+ if (ret)
+ goto out;
+
+ ret = bdc_reset(bdc);
+ if (ret)
+ goto out;
+
+ /* the reinit flag is 1 */
+ bdc_mem_init(bdc, true);
+ ret = bdc_run(bdc);
+out:
+ bdc->reinit = false;
+
+ return ret;
+}
+
+/* Allocate all the dyanmic memory */
+static int bdc_mem_alloc(struct bdc *bdc)
+{
+ u32 page_size;
+ unsigned int num_ieps, num_oeps;
+
+ dev_dbg(bdc->dev,
+ "%s() NUM_BDS_PER_TABLE:%d\n", __func__,
+ NUM_BDS_PER_TABLE);
+ page_size = BDC_PGS(bdc_readl(bdc->regs, BDC_BDCCFG0));
+ /* page size is 2^pgs KB */
+ page_size = 1 << page_size;
+ /* KB */
+ page_size <<= 10;
+ dev_dbg(bdc->dev, "page_size=%d\n", page_size);
+
+ /* Create a pool of bd tables */
+ bdc->bd_table_pool =
+ dma_pool_create("BDC BD tables", bdc->dev, NUM_BDS_PER_TABLE * 16,
+ 16, page_size);
+
+ if (!bdc->bd_table_pool)
+ goto fail;
+
+ if (scratchpad_setup(bdc))
+ goto fail;
+
+ /* read from regs */
+ num_ieps = NUM_NCS(bdc_readl(bdc->regs, BDC_FSCNIC));
+ num_oeps = NUM_NCS(bdc_readl(bdc->regs, BDC_FSCNOC));
+ /* +2: 1 for ep0 and the other is rsvd i.e. bdc_ep[0] is rsvd */
+ bdc->num_eps = num_ieps + num_oeps + 2;
+ dev_dbg(bdc->dev,
+ "ieps:%d eops:%d num_eps:%d\n",
+ num_ieps, num_oeps, bdc->num_eps);
+ /* allocate array of ep pointers */
+ bdc->bdc_ep_array = kcalloc(bdc->num_eps, sizeof(struct bdc_ep *),
+ GFP_KERNEL);
+ if (!bdc->bdc_ep_array)
+ goto fail;
+
+ dev_dbg(bdc->dev, "Allocating sr report0\n");
+ if (setup_srr(bdc, 0))
+ goto fail;
+
+ return 0;
+fail:
+ dev_warn(bdc->dev, "Couldn't initialize memory\n");
+ bdc_mem_free(bdc);
+
+ return -ENOMEM;
+}
+
+/* opposite to bdc_hw_init */
+static void bdc_hw_exit(struct bdc *bdc)
+{
+ dev_dbg(bdc->dev, "%s ()\n", __func__);
+ bdc_mem_free(bdc);
+}
+
+/* Initialize the bdc HW and memory */
+static int bdc_hw_init(struct bdc *bdc)
+{
+ int ret;
+
+ dev_dbg(bdc->dev, "%s ()\n", __func__);
+ ret = bdc_reset(bdc);
+ if (ret) {
+ dev_err(bdc->dev, "err resetting bdc abort bdc init%d\n", ret);
+ return ret;
+ }
+ ret = bdc_mem_alloc(bdc);
+ if (ret) {
+ dev_err(bdc->dev, "Mem alloc failed, aborting\n");
+ return -ENOMEM;
+ }
+ bdc_mem_init(bdc, 0);
+ bdc_dbg_regs(bdc);
+ dev_dbg(bdc->dev, "HW Init done\n");
+
+ return 0;
+}
+
+static int bdc_probe(struct platform_device *pdev)
+{
+ struct bdc *bdc;
+ struct resource *res;
+ int ret = -ENOMEM;
+ int irq;
+ u32 temp;
+ struct device *dev = &pdev->dev;
+
+ dev_dbg(dev, "%s()\n", __func__);
+ bdc = devm_kzalloc(dev, sizeof(*bdc), GFP_KERNEL);
+ if (!bdc)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ bdc->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(bdc->regs)) {
+ dev_err(dev, "ioremap error\n");
+ return -ENOMEM;
+ }
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "platform_get_irq failed:%d\n", irq);
+ return irq;
+ }
+ spin_lock_init(&bdc->lock);
+ platform_set_drvdata(pdev, bdc);
+ bdc->irq = irq;
+ bdc->dev = dev;
+ dev_dbg(bdc->dev, "bdc->regs: %p irq=%d\n", bdc->regs, bdc->irq);
+
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ if ((temp & BDC_P64) &&
+ !dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64))) {
+ dev_dbg(bdc->dev, "Using 64-bit address\n");
+ } else {
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(bdc->dev, "No suitable DMA config available, abort\n");
+ return -ENOTSUPP;
+ }
+ dev_dbg(bdc->dev, "Using 32-bit address\n");
+ }
+ ret = bdc_hw_init(bdc);
+ if (ret) {
+ dev_err(bdc->dev, "BDC init failure:%d\n", ret);
+ return ret;
+ }
+ ret = bdc_udc_init(bdc);
+ if (ret) {
+ dev_err(bdc->dev, "BDC Gadget init failure:%d\n", ret);
+ goto cleanup;
+ }
+ return 0;
+
+cleanup:
+ bdc_hw_exit(bdc);
+
+ return ret;
+}
+
+static int bdc_remove(struct platform_device *pdev)
+{
+ struct bdc *bdc;
+
+ bdc = platform_get_drvdata(pdev);
+ dev_dbg(bdc->dev, "%s ()\n", __func__);
+ bdc_udc_exit(bdc);
+ bdc_hw_exit(bdc);
+
+ return 0;
+}
+
+static struct platform_driver bdc_driver = {
+ .driver = {
+ .name = BRCM_BDC_NAME,
+ .owner = THIS_MODULE
+ },
+ .probe = bdc_probe,
+ .remove = bdc_remove,
+};
+
+module_platform_driver(bdc_driver);
+MODULE_AUTHOR("Ashwini Pahuja <ashwini.linux@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(BRCM_BDC_DESC);
--- /dev/null
+/*
+ * bdc_dbg.c - BRCM BDC USB3.0 device controller debug functions
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+
+#include "bdc.h"
+#include "bdc_dbg.h"
+
+void bdc_dbg_regs(struct bdc *bdc)
+{
+ u32 temp;
+
+ dev_vdbg(bdc->dev, "bdc->regs:%p\n", bdc->regs);
+ temp = bdc_readl(bdc->regs, BDC_BDCCFG0);
+ dev_vdbg(bdc->dev, "bdccfg0:0x%08x\n", temp);
+ temp = bdc_readl(bdc->regs, BDC_BDCCFG1);
+ dev_vdbg(bdc->dev, "bdccfg1:0x%08x\n", temp);
+ temp = bdc_readl(bdc->regs, BDC_BDCCAP0);
+ dev_vdbg(bdc->dev, "bdccap0:0x%08x\n", temp);
+ temp = bdc_readl(bdc->regs, BDC_BDCCAP1);
+ dev_vdbg(bdc->dev, "bdccap1:0x%08x\n", temp);
+ temp = bdc_readl(bdc->regs, BDC_USPC);
+ dev_vdbg(bdc->dev, "uspc:0x%08x\n", temp);
+ temp = bdc_readl(bdc->regs, BDC_DVCSA);
+ dev_vdbg(bdc->dev, "dvcsa:0x%08x\n", temp);
+ temp = bdc_readl(bdc->regs, BDC_DVCSB);
+ dev_vdbg(bdc->dev, "dvcsb:0x%x08\n", temp);
+}
+
+void bdc_dump_epsts(struct bdc *bdc)
+{
+ u32 temp;
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS0(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS0:0x%08x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS1(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS1:0x%x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS2(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS2:0x%08x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS3(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS3:0x%08x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS4(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS4:0x%08x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS5(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS5:0x%08x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS6(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS6:0x%08x\n", temp);
+
+ temp = bdc_readl(bdc->regs, BDC_EPSTS7(0));
+ dev_vdbg(bdc->dev, "BDC_EPSTS7:0x%08x\n", temp);
+}
+
+void bdc_dbg_srr(struct bdc *bdc, u32 srr_num)
+{
+ struct bdc_sr *sr;
+ dma_addr_t addr;
+ int i;
+
+ sr = bdc->srr.sr_bds;
+ addr = bdc->srr.dma_addr;
+ dev_vdbg(bdc->dev, "bdc_dbg_srr sr:%p dqp_index:%d\n",
+ sr, bdc->srr.dqp_index);
+ for (i = 0; i < NUM_SR_ENTRIES; i++) {
+ sr = &bdc->srr.sr_bds[i];
+ dev_vdbg(bdc->dev, "%llx %08x %08x %08x %08x\n",
+ (unsigned long long)addr,
+ le32_to_cpu(sr->offset[0]),
+ le32_to_cpu(sr->offset[1]),
+ le32_to_cpu(sr->offset[2]),
+ le32_to_cpu(sr->offset[3]));
+ addr += sizeof(*sr);
+ }
+}
+
+void bdc_dbg_bd_list(struct bdc *bdc, struct bdc_ep *ep)
+{
+ struct bd_list *bd_list = &ep->bd_list;
+ struct bd_table *bd_table;
+ struct bdc_bd *bd;
+ int tbi, bdi, gbdi;
+ dma_addr_t dma;
+
+ gbdi = 0;
+ dev_vdbg(bdc->dev,
+ "Dump bd list for %s epnum:%d\n",
+ ep->name, ep->ep_num);
+
+ dev_vdbg(bdc->dev,
+ "tabs:%d max_bdi:%d eqp_bdi:%d hwd_bdi:%d num_bds_table:%d\n",
+ bd_list->num_tabs, bd_list->max_bdi, bd_list->eqp_bdi,
+ bd_list->hwd_bdi, bd_list->num_bds_table);
+
+ for (tbi = 0; tbi < bd_list->num_tabs; tbi++) {
+ bd_table = bd_list->bd_table_array[tbi];
+ for (bdi = 0; bdi < bd_list->num_bds_table; bdi++) {
+ bd = bd_table->start_bd + bdi;
+ dma = bd_table->dma + (sizeof(struct bdc_bd) * bdi);
+ dev_vdbg(bdc->dev,
+ "tbi:%2d bdi:%2d gbdi:%2d virt:%p phys:%llx %08x %08x %08x %08x\n",
+ tbi, bdi, gbdi++, bd, (unsigned long long)dma,
+ le32_to_cpu(bd->offset[0]),
+ le32_to_cpu(bd->offset[1]),
+ le32_to_cpu(bd->offset[2]),
+ le32_to_cpu(bd->offset[3]));
+ }
+ dev_vdbg(bdc->dev, "\n\n");
+ }
+}
--- /dev/null
+/*
+ * bdc_dbg.h - header for the BDC debug functions
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+#ifndef __LINUX_BDC_DBG_H__
+#define __LINUX_BDC_DBG_H__
+
+#include "bdc.h"
+
+#ifdef CONFIG_USB_GADGET_VERBOSE
+void bdc_dbg_bd_list(struct bdc *, struct bdc_ep*);
+void bdc_dbg_srr(struct bdc *, u32);
+void bdc_dbg_regs(struct bdc *);
+void bdc_dump_epsts(struct bdc *);
+#else
+static inline void bdc_dbg_regs(struct bdc *bdc)
+{ }
+
+static inline void bdc_dbg_srr(struct bdc *bdc, u32 srr_num)
+{ }
+
+static inline void bdc_dbg_bd_list(struct bdc *bdc, struct bdc_ep *ep)
+{ }
+
+static inline void bdc_dump_epsts(struct bdc *bdc)
+{ }
+#endif /* CONFIG_USB_GADGET_VERBOSE */
+#endif /* __LINUX_BDC_DBG_H__ */
--- /dev/null
+/*
+ * bdc_ep.c - BRCM BDC USB3.0 device controller endpoint related functions
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * Based on drivers under drivers/usb/
+ *
+ * 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.
+ *
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/dmapool.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <asm/unaligned.h>
+#include <linux/platform_device.h>
+#include <linux/usb/composite.h>
+
+#include "bdc.h"
+#include "bdc_ep.h"
+#include "bdc_cmd.h"
+#include "bdc_dbg.h"
+
+static const char * const ep0_state_string[] = {
+ "WAIT_FOR_SETUP",
+ "WAIT_FOR_DATA_START",
+ "WAIT_FOR_DATA_XMIT",
+ "WAIT_FOR_STATUS_START",
+ "WAIT_FOR_STATUS_XMIT",
+ "STATUS_PENDING"
+};
+
+/* Free the bdl during ep disable */
+static void ep_bd_list_free(struct bdc_ep *ep, u32 num_tabs)
+{
+ struct bd_list *bd_list = &ep->bd_list;
+ struct bdc *bdc = ep->bdc;
+ struct bd_table *bd_table;
+ int index;
+
+ dev_dbg(bdc->dev, "%s ep:%s num_tabs:%d\n",
+ __func__, ep->name, num_tabs);
+
+ if (!bd_list->bd_table_array) {
+ dev_dbg(bdc->dev, "%s already freed\n", ep->name);
+ return;
+ }
+ for (index = 0; index < num_tabs; index++) {
+ /*
+ * check if the bd_table struct is allocated ?
+ * if yes, then check if bd memory has been allocated, then
+ * free the dma_pool and also the bd_table struct memory
+ */
+ bd_table = bd_list->bd_table_array[index];
+ dev_dbg(bdc->dev, "bd_table:%p index:%d\n", bd_table, index);
+ if (!bd_table) {
+ dev_dbg(bdc->dev, "bd_table not allocated\n");
+ continue;
+ }
+ if (!bd_table->start_bd) {
+ dev_dbg(bdc->dev, "bd dma pool not allocted\n");
+ continue;
+ }
+
+ dev_dbg(bdc->dev,
+ "Free dma pool start_bd:%p dma:%llx\n",
+ bd_table->start_bd,
+ (unsigned long long)bd_table->dma);
+
+ dma_pool_free(bdc->bd_table_pool,
+ bd_table->start_bd,
+ bd_table->dma);
+ /* Free the bd_table structure */
+ kfree(bd_table);
+ }
+ /* Free the bd table array */
+ kfree(ep->bd_list.bd_table_array);
+}
+
+/*
+ * chain the tables, by insteting a chain bd at the end of prev_table, pointing
+ * to next_table
+ */
+static inline void chain_table(struct bd_table *prev_table,
+ struct bd_table *next_table,
+ u32 bd_p_tab)
+{
+ /* Chain the prev table to next table */
+ prev_table->start_bd[bd_p_tab-1].offset[0] =
+ cpu_to_le32(lower_32_bits(next_table->dma));
+
+ prev_table->start_bd[bd_p_tab-1].offset[1] =
+ cpu_to_le32(upper_32_bits(next_table->dma));
+
+ prev_table->start_bd[bd_p_tab-1].offset[2] =
+ 0x0;
+
+ prev_table->start_bd[bd_p_tab-1].offset[3] =
+ cpu_to_le32(MARK_CHAIN_BD);
+}
+
+/* Allocate the bdl for ep, during config ep */
+static int ep_bd_list_alloc(struct bdc_ep *ep)
+{
+ struct bd_table *prev_table = NULL;
+ int index, num_tabs, bd_p_tab;
+ struct bdc *bdc = ep->bdc;
+ struct bd_table *bd_table;
+ dma_addr_t dma;
+
+ if (usb_endpoint_xfer_isoc(ep->desc))
+ num_tabs = NUM_TABLES_ISOCH;
+ else
+ num_tabs = NUM_TABLES;
+
+ bd_p_tab = NUM_BDS_PER_TABLE;
+ /* if there is only 1 table in bd list then loop chain to self */
+ dev_dbg(bdc->dev,
+ "%s ep:%p num_tabs:%d\n",
+ __func__, ep, num_tabs);
+
+ /* Allocate memory for table array */
+ ep->bd_list.bd_table_array = kzalloc(
+ num_tabs * sizeof(struct bd_table *),
+ GFP_ATOMIC);
+ if (!ep->bd_list.bd_table_array)
+ return -ENOMEM;
+
+ /* Allocate memory for each table */
+ for (index = 0; index < num_tabs; index++) {
+ /* Allocate memory for bd_table structure */
+ bd_table = kzalloc(sizeof(struct bd_table), GFP_ATOMIC);
+ if (!bd_table)
+ goto fail;
+
+ bd_table->start_bd = dma_pool_alloc(bdc->bd_table_pool,
+ GFP_ATOMIC,
+ &dma);
+ if (!bd_table->start_bd)
+ goto fail;
+
+ bd_table->dma = dma;
+
+ dev_dbg(bdc->dev,
+ "index:%d start_bd:%p dma=%08llx prev_table:%p\n",
+ index, bd_table->start_bd,
+ (unsigned long long)bd_table->dma, prev_table);
+
+ ep->bd_list.bd_table_array[index] = bd_table;
+ memset(bd_table->start_bd, 0, bd_p_tab * sizeof(struct bdc_bd));
+ if (prev_table)
+ chain_table(prev_table, bd_table, bd_p_tab);
+
+ prev_table = bd_table;
+ }
+ chain_table(prev_table, ep->bd_list.bd_table_array[0], bd_p_tab);
+ /* Memory allocation is successful, now init the internal fields */
+ ep->bd_list.num_tabs = num_tabs;
+ ep->bd_list.max_bdi = (num_tabs * bd_p_tab) - 1;
+ ep->bd_list.num_tabs = num_tabs;
+ ep->bd_list.num_bds_table = bd_p_tab;
+ ep->bd_list.eqp_bdi = 0;
+ ep->bd_list.hwd_bdi = 0;
+
+ return 0;
+fail:
+ /* Free the bd_table_array, bd_table struct, bd's */
+ ep_bd_list_free(ep, num_tabs);
+
+ return -ENOMEM;
+}
+
+/* returns how many bd's are need for this transfer */
+static inline int bd_needed_req(struct bdc_req *req)
+{
+ int bd_needed = 0;
+ int remaining;
+
+ /* 1 bd needed for 0 byte transfer */
+ if (req->usb_req.length == 0)
+ return 1;
+
+ /* remaining bytes after tranfering all max BD size BD's */
+ remaining = req->usb_req.length % BD_MAX_BUFF_SIZE;
+ if (remaining)
+ bd_needed++;
+
+ /* How many maximum BUFF size BD's ? */
+ remaining = req->usb_req.length / BD_MAX_BUFF_SIZE;
+ bd_needed += remaining;
+
+ return bd_needed;
+}
+
+/* returns the bd index(bdi) corresponding to bd dma address */
+static int bd_add_to_bdi(struct bdc_ep *ep, dma_addr_t bd_dma_addr)
+{
+ struct bd_list *bd_list = &ep->bd_list;
+ dma_addr_t dma_first_bd, dma_last_bd;
+ struct bdc *bdc = ep->bdc;
+ struct bd_table *bd_table;
+ bool found = false;
+ int tbi, bdi;
+
+ dma_first_bd = dma_last_bd = 0;
+ dev_dbg(bdc->dev, "%s %llx\n",
+ __func__, (unsigned long long)bd_dma_addr);
+ /*
+ * Find in which table this bd_dma_addr belongs?, go through the table
+ * array and compare addresses of first and last address of bd of each
+ * table
+ */
+ for (tbi = 0; tbi < bd_list->num_tabs; tbi++) {
+ bd_table = bd_list->bd_table_array[tbi];
+ dma_first_bd = bd_table->dma;
+ dma_last_bd = bd_table->dma +
+ (sizeof(struct bdc_bd) *
+ (bd_list->num_bds_table - 1));
+ dev_dbg(bdc->dev, "dma_first_bd:%llx dma_last_bd:%llx\n",
+ (unsigned long long)dma_first_bd,
+ (unsigned long long)dma_last_bd);
+ if (bd_dma_addr >= dma_first_bd && bd_dma_addr <= dma_last_bd) {
+ found = true;
+ break;
+ }
+ }
+ if (unlikely(!found)) {
+ dev_err(bdc->dev, "%s FATAL err, bd not found\n", __func__);
+ return -EINVAL;
+ }
+ /* Now we know the table, find the bdi */
+ bdi = (bd_dma_addr - dma_first_bd) / sizeof(struct bdc_bd);
+
+ /* return the global bdi, to compare with ep eqp_bdi */
+ return (bdi + (tbi * bd_list->num_bds_table));
+}
+
+/* returns the table index(tbi) of the given bdi */
+static int bdi_to_tbi(struct bdc_ep *ep, int bdi)
+{
+ int tbi;
+
+ tbi = bdi / ep->bd_list.num_bds_table;
+ dev_vdbg(ep->bdc->dev,
+ "bdi:%d num_bds_table:%d tbi:%d\n",
+ bdi, ep->bd_list.num_bds_table, tbi);
+
+ return tbi;
+}
+
+/* Find the bdi last bd in the transfer */
+static inline int find_end_bdi(struct bdc_ep *ep, int next_hwd_bdi)
+{
+ int end_bdi;
+
+ end_bdi = next_hwd_bdi - 1;
+ if (end_bdi < 0)
+ end_bdi = ep->bd_list.max_bdi - 1;
+ else if ((end_bdi % (ep->bd_list.num_bds_table-1)) == 0)
+ end_bdi--;
+
+ return end_bdi;
+}
+
+/*
+ * How many transfer bd's are available on this ep bdl, chain bds are not
+ * counted in available bds
+ */
+static int bd_available_ep(struct bdc_ep *ep)
+{
+ struct bd_list *bd_list = &ep->bd_list;
+ int available1, available2;
+ struct bdc *bdc = ep->bdc;
+ int chain_bd1, chain_bd2;
+ int available_bd = 0;
+
+ available1 = available2 = chain_bd1 = chain_bd2 = 0;
+ /* if empty then we have all bd's available - number of chain bd's */
+ if (bd_list->eqp_bdi == bd_list->hwd_bdi)
+ return bd_list->max_bdi - bd_list->num_tabs;
+
+ /*
+ * Depending upon where eqp and dqp pointers are, caculate number
+ * of avaialble bd's
+ */
+ if (bd_list->hwd_bdi < bd_list->eqp_bdi) {
+ /* available bd's are from eqp..max_bds + 0..dqp - chain_bds */
+ available1 = bd_list->max_bdi - bd_list->eqp_bdi;
+ available2 = bd_list->hwd_bdi;
+ chain_bd1 = available1 / bd_list->num_bds_table;
+ chain_bd2 = available2 / bd_list->num_bds_table;
+ dev_vdbg(bdc->dev, "chain_bd1:%d chain_bd2:%d\n",
+ chain_bd1, chain_bd2);
+ available_bd = available1 + available2 - chain_bd1 - chain_bd2;
+ } else {
+ /* available bd's are from eqp..dqp - number of chain bd's */
+ available1 = bd_list->hwd_bdi - bd_list->eqp_bdi;
+ /* if gap between eqp and dqp is less than NUM_BDS_PER_TABLE */
+ if ((bd_list->hwd_bdi - bd_list->eqp_bdi)
+ <= bd_list->num_bds_table) {
+ /* If there any chain bd in between */
+ if (!(bdi_to_tbi(ep, bd_list->hwd_bdi)
+ == bdi_to_tbi(ep, bd_list->eqp_bdi))) {
+ available_bd = available1 - 1;
+ }
+ } else {
+ chain_bd1 = available1 / bd_list->num_bds_table;
+ available_bd = available1 - chain_bd1;
+ }
+ }
+ /*
+ * we need to keep one extra bd to check if ring is full or empty so
+ * reduce by 1
+ */
+ available_bd--;
+ dev_vdbg(bdc->dev, "available_bd:%d\n", available_bd);
+
+ return available_bd;
+}
+
+/* Notify the hardware after queueing the bd to bdl */
+void bdc_notify_xfr(struct bdc *bdc, u32 epnum)
+{
+ struct bdc_ep *ep = bdc->bdc_ep_array[epnum];
+
+ dev_vdbg(bdc->dev, "%s epnum:%d\n", __func__, epnum);
+ /*
+ * We don't have anyway to check if ep state is running,
+ * except the software flags.
+ */
+ if (unlikely(ep->flags & BDC_EP_STOP))
+ ep->flags &= ~BDC_EP_STOP;
+
+ bdc_writel(bdc->regs, BDC_XSFNTF, epnum);
+}
+
+/* returns the bd corresponding to bdi */
+static struct bdc_bd *bdi_to_bd(struct bdc_ep *ep, int bdi)
+{
+ int tbi = bdi_to_tbi(ep, bdi);
+ int local_bdi = 0;
+
+ local_bdi = bdi - (tbi * ep->bd_list.num_bds_table);
+ dev_vdbg(ep->bdc->dev,
+ "%s bdi:%d local_bdi:%d\n",
+ __func__, bdi, local_bdi);
+
+ return (ep->bd_list.bd_table_array[tbi]->start_bd + local_bdi);
+}
+
+/* Advance the enqueue pointer */
+static void ep_bdlist_eqp_adv(struct bdc_ep *ep)
+{
+ ep->bd_list.eqp_bdi++;
+ /* if it's chain bd, then move to next */
+ if (((ep->bd_list.eqp_bdi + 1) % ep->bd_list.num_bds_table) == 0)
+ ep->bd_list.eqp_bdi++;
+
+ /* if the eqp is pointing to last + 1 then move back to 0 */
+ if (ep->bd_list.eqp_bdi == (ep->bd_list.max_bdi + 1))
+ ep->bd_list.eqp_bdi = 0;
+}
+
+/* Setup the first bd for ep0 transfer */
+static int setup_first_bd_ep0(struct bdc *bdc, struct bdc_req *req, u32 *dword3)
+{
+ u16 wValue;
+ u32 req_len;
+
+ req->ep->dir = 0;
+ req_len = req->usb_req.length;
+ switch (bdc->ep0_state) {
+ case WAIT_FOR_DATA_START:
+ *dword3 |= BD_TYPE_DS;
+ if (bdc->setup_pkt.bRequestType & USB_DIR_IN)
+ *dword3 |= BD_DIR_IN;
+
+ /* check if zlp will be needed */
+ wValue = le16_to_cpu(bdc->setup_pkt.wValue);
+ if ((wValue > req_len) &&
+ (req_len % bdc->gadget.ep0->maxpacket == 0)) {
+ dev_dbg(bdc->dev, "ZLP needed wVal:%d len:%d MaxP:%d\n",
+ wValue, req_len,
+ bdc->gadget.ep0->maxpacket);
+ bdc->zlp_needed = true;
+ }
+ break;
+
+ case WAIT_FOR_STATUS_START:
+ *dword3 |= BD_TYPE_SS;
+ if (!le16_to_cpu(bdc->setup_pkt.wLength) ||
+ !(bdc->setup_pkt.bRequestType & USB_DIR_IN))
+ *dword3 |= BD_DIR_IN;
+ break;
+ default:
+ dev_err(bdc->dev,
+ "Unknown ep0 state for queueing bd ep0_state:%s\n",
+ ep0_state_string[bdc->ep0_state]);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* Setup the bd dma descriptor for a given request */
+static int setup_bd_list_xfr(struct bdc *bdc, struct bdc_req *req, int num_bds)
+{
+ dma_addr_t buf_add = req->usb_req.dma;
+ u32 maxp, tfs, dword2, dword3;
+ struct bd_transfer *bd_xfr;
+ struct bd_list *bd_list;
+ struct bdc_ep *ep;
+ struct bdc_bd *bd;
+ int ret, bdnum;
+ u32 req_len;
+
+ ep = req->ep;
+ bd_list = &ep->bd_list;
+ bd_xfr = &req->bd_xfr;
+ bd_xfr->req = req;
+ bd_xfr->start_bdi = bd_list->eqp_bdi;
+ bd = bdi_to_bd(ep, bd_list->eqp_bdi);
+ req_len = req->usb_req.length;
+ maxp = usb_endpoint_maxp(ep->desc) & 0x7ff;
+ tfs = roundup(req->usb_req.length, maxp);
+ tfs = tfs/maxp;
+ dev_vdbg(bdc->dev, "%s ep:%s num_bds:%d tfs:%d r_len:%d bd:%p\n",
+ __func__, ep->name, num_bds, tfs, req_len, bd);
+
+ for (bdnum = 0; bdnum < num_bds; bdnum++) {
+ dword2 = dword3 = 0;
+ /* First bd */
+ if (!bdnum) {
+ dword3 |= BD_SOT|BD_SBF|(tfs<<BD_TFS_SHIFT);
+ dword2 |= BD_LTF;
+ /* format of first bd for ep0 is different than other */
+ if (ep->ep_num == 1)
+ ret = setup_first_bd_ep0(bdc, req, &dword3);
+ if (ret)
+ return ret;
+ }
+ if (!req->ep->dir)
+ dword3 |= BD_ISP;
+
+ if (req_len > BD_MAX_BUFF_SIZE) {
+ dword2 |= BD_MAX_BUFF_SIZE;
+ req_len -= BD_MAX_BUFF_SIZE;
+ } else {
+ /* this should be the last bd */
+ dword2 |= req_len;
+ dword3 |= BD_IOC;
+ dword3 |= BD_EOT;
+ }
+ /* Currently only 1 INT target is supported */
+ dword2 |= BD_INTR_TARGET(0);
+ bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
+ if (unlikely(!bd)) {
+ dev_err(bdc->dev, "Err bd pointing to wrong addr\n");
+ return -EINVAL;
+ }
+ /* write bd */
+ bd->offset[0] = cpu_to_le32(lower_32_bits(buf_add));
+ bd->offset[1] = cpu_to_le32(upper_32_bits(buf_add));
+ bd->offset[2] = cpu_to_le32(dword2);
+ bd->offset[3] = cpu_to_le32(dword3);
+ /* advance eqp pointer */
+ ep_bdlist_eqp_adv(ep);
+ /* advance the buff pointer */
+ buf_add += BD_MAX_BUFF_SIZE;
+ dev_vdbg(bdc->dev, "buf_add:%08llx req_len:%d bd:%p eqp:%d\n",
+ (unsigned long long)buf_add, req_len, bd,
+ ep->bd_list.eqp_bdi);
+ bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
+ bd->offset[3] = cpu_to_le32(BD_SBF);
+ }
+ /* clear the STOP BD fetch bit from the first bd of this xfr */
+ bd = bdi_to_bd(ep, bd_xfr->start_bdi);
+ bd->offset[3] &= cpu_to_le32(~BD_SBF);
+ /* the new eqp will be next hw dqp */
+ bd_xfr->num_bds = num_bds;
+ bd_xfr->next_hwd_bdi = ep->bd_list.eqp_bdi;
+ /* everything is written correctly before notifying the HW */
+ wmb();
+
+ return 0;
+}
+
+/* Queue the xfr */
+static int bdc_queue_xfr(struct bdc *bdc, struct bdc_req *req)
+{
+ int num_bds, bd_available;
+ struct bdc_ep *ep;
+ int ret;
+
+ ep = req->ep;
+ dev_dbg(bdc->dev, "%s req:%p\n", __func__, req);
+ dev_dbg(bdc->dev, "eqp_bdi:%d hwd_bdi:%d\n",
+ ep->bd_list.eqp_bdi, ep->bd_list.hwd_bdi);
+
+ num_bds = bd_needed_req(req);
+ bd_available = bd_available_ep(ep);
+
+ /* how many bd's are avaialble on ep */
+ if (num_bds > bd_available)
+ return -ENOMEM;
+
+ ret = setup_bd_list_xfr(bdc, req, num_bds);
+ if (ret)
+ return ret;
+ list_add_tail(&req->queue, &ep->queue);
+ bdc_dbg_bd_list(bdc, ep);
+ bdc_notify_xfr(bdc, ep->ep_num);
+
+ return 0;
+}
+
+/* callback to gadget layer when xfr completes */
+static void bdc_req_complete(struct bdc_ep *ep, struct bdc_req *req,
+ int status)
+{
+ struct bdc *bdc = ep->bdc;
+
+ if (req == NULL || &req->queue == NULL || &req->usb_req == NULL)
+ return;
+
+ dev_dbg(bdc->dev, "%s ep:%s status:%d\n", __func__, ep->name, status);
+ list_del(&req->queue);
+ req->usb_req.status = status;
+ usb_gadget_unmap_request(&bdc->gadget, &req->usb_req, ep->dir);
+ if (req->usb_req.complete) {
+ spin_unlock(&bdc->lock);
+ usb_gadget_giveback_request(&ep->usb_ep, &req->usb_req);
+ spin_lock(&bdc->lock);
+ }
+}
+
+/* Disable the endpoint */
+int bdc_ep_disable(struct bdc_ep *ep)
+{
+ struct bdc_req *req;
+ struct bdc *bdc;
+ int ret;
+
+ ret = 0;
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s() ep->ep_num=%d\n", __func__, ep->ep_num);
+ /* Stop the endpoint */
+ ret = bdc_stop_ep(bdc, ep->ep_num);
+
+ /*
+ * Intentionally don't check the ret value of stop, it can fail in
+ * disconnect scenarios, continue with dconfig
+ */
+ /* de-queue any pending requests */
+ while (!list_empty(&ep->queue)) {
+ req = list_entry(ep->queue.next, struct bdc_req,
+ queue);
+ bdc_req_complete(ep, req, -ESHUTDOWN);
+ }
+ /* deconfigure the endpoint */
+ ret = bdc_dconfig_ep(bdc, ep);
+ if (ret)
+ dev_warn(bdc->dev,
+ "dconfig fail but continue with memory free");
+
+ ep->flags = 0;
+ /* ep0 memory is not freed, but reused on next connect sr */
+ if (ep->ep_num == 1)
+ return 0;
+
+ /* Free the bdl memory */
+ ep_bd_list_free(ep, ep->bd_list.num_tabs);
+ ep->desc = NULL;
+ ep->comp_desc = NULL;
+ ep->usb_ep.desc = NULL;
+ ep->ep_type = 0;
+
+ return ret;
+}
+
+/* Enable the ep */
+int bdc_ep_enable(struct bdc_ep *ep)
+{
+ struct bdc *bdc;
+ int ret = 0;
+
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s NUM_TABLES:%d %d\n",
+ __func__, NUM_TABLES, NUM_TABLES_ISOCH);
+
+ ret = ep_bd_list_alloc(ep);
+ if (ret) {
+ dev_err(bdc->dev, "ep bd list allocation failed:%d\n", ret);
+ return -ENOMEM;
+ }
+ bdc_dbg_bd_list(bdc, ep);
+ /* only for ep0: config ep is called for ep0 from connect event */
+ ep->flags |= BDC_EP_ENABLED;
+ if (ep->ep_num == 1)
+ return ret;
+
+ /* Issue a configure endpoint command */
+ ret = bdc_config_ep(bdc, ep);
+ if (ret)
+ return ret;
+
+ ep->usb_ep.maxpacket = usb_endpoint_maxp(ep->desc);
+ ep->usb_ep.desc = ep->desc;
+ ep->usb_ep.comp_desc = ep->comp_desc;
+ ep->ep_type = usb_endpoint_type(ep->desc);
+ ep->flags |= BDC_EP_ENABLED;
+
+ return 0;
+}
+
+/* EP0 related code */
+
+/* Queue a status stage BD */
+static int ep0_queue_status_stage(struct bdc *bdc)
+{
+ struct bdc_req *status_req;
+ struct bdc_ep *ep;
+
+ status_req = &bdc->status_req;
+ ep = bdc->bdc_ep_array[1];
+ status_req->ep = ep;
+ status_req->usb_req.length = 0;
+ status_req->usb_req.status = -EINPROGRESS;
+ status_req->usb_req.actual = 0;
+ status_req->usb_req.complete = NULL;
+ bdc_queue_xfr(bdc, status_req);
+
+ return 0;
+}
+
+/* Queue xfr on ep0 */
+static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req)
+{
+ struct bdc *bdc;
+ int ret;
+
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ req->usb_req.actual = 0;
+ req->usb_req.status = -EINPROGRESS;
+ req->epnum = ep->ep_num;
+
+ if (bdc->delayed_status) {
+ bdc->delayed_status = false;
+ /* if status stage was delayed? */
+ if (bdc->ep0_state == WAIT_FOR_STATUS_START) {
+ /* Queue a status stage BD */
+ ep0_queue_status_stage(bdc);
+ bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
+ return 0;
+ }
+ } else {
+ /*
+ * if delayed status is false and 0 length transfer is requested
+ * i.e. for status stage of some setup request, then just
+ * return from here the status stage is queued independently
+ */
+ if (req->usb_req.length == 0)
+ return 0;
+
+ }
+ ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
+ if (ret) {
+ dev_err(bdc->dev, "dma mapping failed %s\n", ep->name);
+ return ret;
+ }
+
+ return bdc_queue_xfr(bdc, req);
+}
+
+/* Queue data stage */
+static int ep0_queue_data_stage(struct bdc *bdc)
+{
+ struct usb_request *ep0_usb_req;
+ struct bdc_ep *ep;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ ep0_usb_req = &bdc->ep0_req.usb_req;
+ ep = bdc->bdc_ep_array[1];
+ bdc->ep0_req.ep = ep;
+ bdc->ep0_req.usb_req.complete = NULL;
+
+ return ep0_queue(ep, &bdc->ep0_req);
+}
+
+/* Queue req on ep */
+static int ep_queue(struct bdc_ep *ep, struct bdc_req *req)
+{
+ struct bdc *bdc;
+ int ret = 0;
+
+ bdc = ep->bdc;
+ if (!req || !ep || !ep->usb_ep.desc)
+ return -EINVAL;
+
+ req->usb_req.actual = 0;
+ req->usb_req.status = -EINPROGRESS;
+ req->epnum = ep->ep_num;
+
+ ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
+ if (ret) {
+ dev_err(bdc->dev, "dma mapping failed\n");
+ return ret;
+ }
+
+ return bdc_queue_xfr(bdc, req);
+}
+
+/* Dequeue a request from ep */
+static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
+{
+ int start_bdi, end_bdi, tbi, eqp_bdi, curr_hw_dqpi;
+ bool start_pending, end_pending;
+ bool first_remove = false;
+ struct bdc_req *first_req;
+ struct bdc_bd *bd_start;
+ struct bd_table *table;
+ dma_addr_t next_bd_dma;
+ u64 deq_ptr_64 = 0;
+ struct bdc *bdc;
+ u32 tmp_32;
+ int ret;
+
+ bdc = ep->bdc;
+ start_pending = end_pending = false;
+ eqp_bdi = ep->bd_list.eqp_bdi - 1;
+
+ if (eqp_bdi < 0)
+ eqp_bdi = ep->bd_list.max_bdi;
+
+ start_bdi = req->bd_xfr.start_bdi;
+ end_bdi = find_end_bdi(ep, req->bd_xfr.next_hwd_bdi);
+
+ dev_dbg(bdc->dev, "%s ep:%s start:%d end:%d\n",
+ __func__, ep->name, start_bdi, end_bdi);
+ dev_dbg(bdc->dev, "ep_dequeue ep=%p ep->desc=%p\n",
+ ep, (void *)ep->usb_ep.desc);
+ /* Stop the ep to see where the HW is ? */
+ ret = bdc_stop_ep(bdc, ep->ep_num);
+ /* if there is an issue with stopping ep, then no need to go further */
+ if (ret)
+ return 0;
+
+ /*
+ * After endpoint is stopped, there can be 3 cases, the request
+ * is processed, pending or in the middle of processing
+ */
+
+ /* The current hw dequeue pointer */
+ tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0(0));
+ deq_ptr_64 = tmp_32;
+ tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0(1));
+ deq_ptr_64 |= ((u64)tmp_32 << 32);
+
+ /* we have the dma addr of next bd that will be fetched by hardware */
+ curr_hw_dqpi = bd_add_to_bdi(ep, deq_ptr_64);
+ if (curr_hw_dqpi < 0)
+ return curr_hw_dqpi;
+
+ /*
+ * curr_hw_dqpi points to actual dqp of HW and HW owns bd's from
+ * curr_hw_dqbdi..eqp_bdi.
+ */
+
+ /* Check if start_bdi and end_bdi are in range of HW owned BD's */
+ if (curr_hw_dqpi > eqp_bdi) {
+ /* there is a wrap from last to 0 */
+ if (start_bdi >= curr_hw_dqpi || start_bdi <= eqp_bdi) {
+ start_pending = true;
+ end_pending = true;
+ } else if (end_bdi >= curr_hw_dqpi || end_bdi <= eqp_bdi) {
+ end_pending = true;
+ }
+ } else {
+ if (start_bdi >= curr_hw_dqpi) {
+ start_pending = true;
+ end_pending = true;
+ } else if (end_bdi >= curr_hw_dqpi) {
+ end_pending = true;
+ }
+ }
+ dev_dbg(bdc->dev,
+ "start_pending:%d end_pending:%d speed:%d\n",
+ start_pending, end_pending, bdc->gadget.speed);
+
+ /* If both start till end are processes, we cannot deq req */
+ if (!start_pending && !end_pending)
+ return -EINVAL;
+
+ /*
+ * if ep_dequeue is called after disconnect then just return
+ * success from here
+ */
+ if (bdc->gadget.speed == USB_SPEED_UNKNOWN)
+ return 0;
+ tbi = bdi_to_tbi(ep, req->bd_xfr.next_hwd_bdi);
+ table = ep->bd_list.bd_table_array[tbi];
+ next_bd_dma = table->dma +
+ sizeof(struct bdc_bd)*(req->bd_xfr.next_hwd_bdi -
+ tbi * ep->bd_list.num_bds_table);
+
+ first_req = list_first_entry(&ep->queue, struct bdc_req,
+ queue);
+
+ if (req == first_req)
+ first_remove = true;
+
+ /*
+ * Due to HW limitation we need to bypadd chain bd's and issue ep_bla,
+ * incase if start is pending this is the first request in the list
+ * then issue ep_bla instead of marking as chain bd
+ */
+ if (start_pending && !first_remove) {
+ /*
+ * Mark the start bd as Chain bd, and point the chain
+ * bd to next_bd_dma
+ */
+ bd_start = bdi_to_bd(ep, start_bdi);
+ bd_start->offset[0] = cpu_to_le32(lower_32_bits(next_bd_dma));
+ bd_start->offset[1] = cpu_to_le32(upper_32_bits(next_bd_dma));
+ bd_start->offset[2] = 0x0;
+ bd_start->offset[3] = cpu_to_le32(MARK_CHAIN_BD);
+ bdc_dbg_bd_list(bdc, ep);
+ } else if (end_pending) {
+ /*
+ * The transfer is stopped in the middle, move the
+ * HW deq pointer to next_bd_dma
+ */
+ ret = bdc_ep_bla(bdc, ep, next_bd_dma);
+ if (ret) {
+ dev_err(bdc->dev, "error in ep_bla:%d\n", ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/* Halt/Clear the ep based on value */
+static int ep_set_halt(struct bdc_ep *ep, u32 value)
+{
+ struct bdc *bdc;
+ int ret;
+
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
+
+ if (value) {
+ dev_dbg(bdc->dev, "Halt\n");
+ if (ep->ep_num == 1)
+ bdc->ep0_state = WAIT_FOR_SETUP;
+
+ ret = bdc_ep_set_stall(bdc, ep->ep_num);
+ if (ret)
+ dev_err(bdc->dev, "failed to %s STALL on %s\n",
+ value ? "set" : "clear", ep->name);
+ else
+ ep->flags |= BDC_EP_STALL;
+ } else {
+ /* Clear */
+ dev_dbg(bdc->dev, "Before Clear\n");
+ ret = bdc_ep_clear_stall(bdc, ep->ep_num);
+ if (ret)
+ dev_err(bdc->dev, "failed to %s STALL on %s\n",
+ value ? "set" : "clear", ep->name);
+ else
+ ep->flags &= ~BDC_EP_STALL;
+ dev_dbg(bdc->dev, "After Clear\n");
+ }
+
+ return ret;
+}
+
+/* Free all the ep */
+void bdc_free_ep(struct bdc *bdc)
+{
+ struct bdc_ep *ep;
+ u8 epnum;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ for (epnum = 1; epnum < bdc->num_eps; epnum++) {
+ ep = bdc->bdc_ep_array[epnum];
+ if (!ep)
+ continue;
+
+ if (ep->flags & BDC_EP_ENABLED)
+ ep_bd_list_free(ep, ep->bd_list.num_tabs);
+
+ /* ep0 is not in this gadget list */
+ if (epnum != 1)
+ list_del(&ep->usb_ep.ep_list);
+
+ kfree(ep);
+ }
+}
+
+/* USB2 spec, section 7.1.20 */
+static int bdc_set_test_mode(struct bdc *bdc)
+{
+ u32 usb2_pm;
+
+ usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
+ usb2_pm &= ~BDC_PTC_MASK;
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ switch (bdc->test_mode) {
+ case TEST_J:
+ case TEST_K:
+ case TEST_SE0_NAK:
+ case TEST_PACKET:
+ case TEST_FORCE_EN:
+ usb2_pm |= bdc->test_mode << 28;
+ break;
+ default:
+ return -EINVAL;
+ }
+ dev_dbg(bdc->dev, "usb2_pm=%08x", usb2_pm);
+ bdc_writel(bdc->regs, BDC_USPPM2, usb2_pm);
+
+ return 0;
+}
+
+/*
+ * Helper function to handle Transfer status report with status as either
+ * success or short
+ */
+static void handle_xsr_succ_status(struct bdc *bdc, struct bdc_ep *ep,
+ struct bdc_sr *sreport)
+{
+ int short_bdi, start_bdi, end_bdi, max_len_bds, chain_bds;
+ struct bd_list *bd_list = &ep->bd_list;
+ int actual_length, length_short;
+ struct bd_transfer *bd_xfr;
+ struct bdc_bd *short_bd;
+ struct bdc_req *req;
+ u64 deq_ptr_64 = 0;
+ int status = 0;
+ int sr_status;
+ u32 tmp_32;
+
+ dev_dbg(bdc->dev, "%s ep:%p\n", __func__, ep);
+ bdc_dbg_srr(bdc, 0);
+ /* do not process thie sr if ignore flag is set */
+ if (ep->ignore_next_sr) {
+ ep->ignore_next_sr = false;
+ return;
+ }
+
+ if (unlikely(list_empty(&ep->queue))) {
+ dev_warn(bdc->dev, "xfr srr with no BD's queued\n");
+ return;
+ }
+ req = list_entry(ep->queue.next, struct bdc_req,
+ queue);
+
+ bd_xfr = &req->bd_xfr;
+ sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
+
+ /*
+ * sr_status is short and this transfer has more than 1 bd then it needs
+ * special handling, this is only applicable for bulk and ctrl
+ */
+ if (sr_status == XSF_SHORT && bd_xfr->num_bds > 1) {
+ /*
+ * This is multi bd xfr, lets see which bd
+ * caused short transfer and how many bytes have been
+ * transferred so far.
+ */
+ tmp_32 = le32_to_cpu(sreport->offset[0]);
+ deq_ptr_64 = tmp_32;
+ tmp_32 = le32_to_cpu(sreport->offset[1]);
+ deq_ptr_64 |= ((u64)tmp_32 << 32);
+ short_bdi = bd_add_to_bdi(ep, deq_ptr_64);
+ if (unlikely(short_bdi < 0))
+ dev_warn(bdc->dev, "bd doesn't exist?\n");
+
+ start_bdi = bd_xfr->start_bdi;
+ /*
+ * We know the start_bdi and short_bdi, how many xfr
+ * bds in between
+ */
+ if (start_bdi <= short_bdi) {
+ max_len_bds = short_bdi - start_bdi;
+ if (max_len_bds <= bd_list->num_bds_table) {
+ if (!(bdi_to_tbi(ep, start_bdi) ==
+ bdi_to_tbi(ep, short_bdi)))
+ max_len_bds--;
+ } else {
+ chain_bds = max_len_bds/bd_list->num_bds_table;
+ max_len_bds -= chain_bds;
+ }
+ } else {
+ /* there is a wrap in the ring within a xfr */
+ chain_bds = (bd_list->max_bdi - start_bdi)/
+ bd_list->num_bds_table;
+ chain_bds += short_bdi/bd_list->num_bds_table;
+ max_len_bds = bd_list->max_bdi - start_bdi;
+ max_len_bds += short_bdi;
+ max_len_bds -= chain_bds;
+ }
+ /* max_len_bds is the number of full length bds */
+ end_bdi = find_end_bdi(ep, bd_xfr->next_hwd_bdi);
+ if (!(end_bdi == short_bdi))
+ ep->ignore_next_sr = true;
+
+ actual_length = max_len_bds * BD_MAX_BUFF_SIZE;
+ short_bd = bdi_to_bd(ep, short_bdi);
+ /* length queued */
+ length_short = le32_to_cpu(short_bd->offset[2]) & 0x1FFFFF;
+ /* actual length trensfered */
+ length_short -= SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
+ actual_length += length_short;
+ req->usb_req.actual = actual_length;
+ } else {
+ req->usb_req.actual = req->usb_req.length -
+ SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
+ dev_dbg(bdc->dev,
+ "len=%d actual=%d bd_xfr->next_hwd_bdi:%d\n",
+ req->usb_req.length, req->usb_req.actual,
+ bd_xfr->next_hwd_bdi);
+ }
+
+ /* Update the dequeue pointer */
+ ep->bd_list.hwd_bdi = bd_xfr->next_hwd_bdi;
+ if (req->usb_req.actual < req->usb_req.length) {
+ dev_dbg(bdc->dev, "short xfr on %d\n", ep->ep_num);
+ if (req->usb_req.short_not_ok)
+ status = -EREMOTEIO;
+ }
+ bdc_req_complete(ep, bd_xfr->req, status);
+}
+
+/* EP0 setup related packet handlers */
+
+/*
+ * Setup packet received, just store the packet and process on next DS or SS
+ * started SR
+ */
+void bdc_xsf_ep0_setup_recv(struct bdc *bdc, struct bdc_sr *sreport)
+{
+ struct usb_ctrlrequest *setup_pkt;
+ u32 len;
+
+ dev_dbg(bdc->dev,
+ "%s ep0_state:%s\n",
+ __func__, ep0_state_string[bdc->ep0_state]);
+ /* Store received setup packet */
+ setup_pkt = &bdc->setup_pkt;
+ memcpy(setup_pkt, &sreport->offset[0], sizeof(*setup_pkt));
+ len = le16_to_cpu(setup_pkt->wLength);
+ if (!len)
+ bdc->ep0_state = WAIT_FOR_STATUS_START;
+ else
+ bdc->ep0_state = WAIT_FOR_DATA_START;
+
+
+ dev_dbg(bdc->dev,
+ "%s exit ep0_state:%s\n",
+ __func__, ep0_state_string[bdc->ep0_state]);
+}
+
+/* Stall ep0 */
+static void ep0_stall(struct bdc *bdc)
+{
+ struct bdc_ep *ep = bdc->bdc_ep_array[1];
+ struct bdc_req *req;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ bdc->delayed_status = false;
+ ep_set_halt(ep, 1);
+
+ /* de-queue any pendig requests */
+ while (!list_empty(&ep->queue)) {
+ req = list_entry(ep->queue.next, struct bdc_req,
+ queue);
+ bdc_req_complete(ep, req, -ESHUTDOWN);
+ }
+}
+
+/* SET_ADD handlers */
+static int ep0_set_address(struct bdc *bdc, struct usb_ctrlrequest *ctrl)
+{
+ enum usb_device_state state = bdc->gadget.state;
+ int ret = 0;
+ u32 addr;
+
+ addr = le16_to_cpu(ctrl->wValue);
+ dev_dbg(bdc->dev,
+ "%s addr:%d dev state:%d\n",
+ __func__, addr, state);
+
+ if (addr > 127)
+ return -EINVAL;
+
+ switch (state) {
+ case USB_STATE_DEFAULT:
+ case USB_STATE_ADDRESS:
+ /* Issue Address device command */
+ ret = bdc_address_device(bdc, addr);
+ if (ret)
+ return ret;
+
+ if (addr)
+ usb_gadget_set_state(&bdc->gadget, USB_STATE_ADDRESS);
+ else
+ usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
+
+ bdc->dev_addr = addr;
+ break;
+ default:
+ dev_warn(bdc->dev,
+ "SET Address in wrong device state %d\n",
+ state);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+/* Handler for SET/CLEAR FEATURE requests for device */
+static int ep0_handle_feature_dev(struct bdc *bdc, u16 wValue,
+ u16 wIndex, bool set)
+{
+ enum usb_device_state state = bdc->gadget.state;
+ u32 usppms = 0;
+
+ dev_dbg(bdc->dev, "%s set:%d dev state:%d\n",
+ __func__, set, state);
+ switch (wValue) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ dev_dbg(bdc->dev, "USB_DEVICE_REMOTE_WAKEUP\n");
+ if (set)
+ bdc->devstatus |= REMOTE_WAKE_ENABLE;
+ else
+ bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
+ break;
+
+ case USB_DEVICE_TEST_MODE:
+ dev_dbg(bdc->dev, "USB_DEVICE_TEST_MODE\n");
+ if ((wIndex & 0xFF) ||
+ (bdc->gadget.speed != USB_SPEED_HIGH) || !set)
+ return -EINVAL;
+
+ bdc->test_mode = wIndex >> 8;
+ break;
+
+ case USB_DEVICE_U1_ENABLE:
+ dev_dbg(bdc->dev, "USB_DEVICE_U1_ENABLE\n");
+
+ if (bdc->gadget.speed != USB_SPEED_SUPER ||
+ state != USB_STATE_CONFIGURED)
+ return -EINVAL;
+
+ usppms = bdc_readl(bdc->regs, BDC_USPPMS);
+ if (set) {
+ /* clear previous u1t */
+ usppms &= ~BDC_U1T(BDC_U1T_MASK);
+ usppms |= BDC_U1T(U1_TIMEOUT);
+ usppms |= BDC_U1E | BDC_PORT_W1S;
+ bdc->devstatus |= (1 << USB_DEV_STAT_U1_ENABLED);
+ } else {
+ usppms &= ~BDC_U1E;
+ usppms |= BDC_PORT_W1S;
+ bdc->devstatus &= ~(1 << USB_DEV_STAT_U1_ENABLED);
+ }
+ bdc_writel(bdc->regs, BDC_USPPMS, usppms);
+ break;
+
+ case USB_DEVICE_U2_ENABLE:
+ dev_dbg(bdc->dev, "USB_DEVICE_U2_ENABLE\n");
+
+ if (bdc->gadget.speed != USB_SPEED_SUPER ||
+ state != USB_STATE_CONFIGURED)
+ return -EINVAL;
+
+ usppms = bdc_readl(bdc->regs, BDC_USPPMS);
+ if (set) {
+ usppms |= BDC_U2E;
+ usppms |= BDC_U2A;
+ bdc->devstatus |= (1 << USB_DEV_STAT_U2_ENABLED);
+ } else {
+ usppms &= ~BDC_U2E;
+ usppms &= ~BDC_U2A;
+ bdc->devstatus &= ~(1 << USB_DEV_STAT_U2_ENABLED);
+ }
+ bdc_writel(bdc->regs, BDC_USPPMS, usppms);
+ break;
+
+ case USB_DEVICE_LTM_ENABLE:
+ dev_dbg(bdc->dev, "USB_DEVICE_LTM_ENABLE?\n");
+ if (bdc->gadget.speed != USB_SPEED_SUPER ||
+ state != USB_STATE_CONFIGURED)
+ return -EINVAL;
+ break;
+ default:
+ dev_err(bdc->dev, "Unknown wValue:%d\n", wValue);
+ return -EOPNOTSUPP;
+ } /* USB_RECIP_DEVICE end */
+
+ return 0;
+}
+
+/* SET/CLEAR FEATURE handler */
+static int ep0_handle_feature(struct bdc *bdc,
+ struct usb_ctrlrequest *setup_pkt, bool set)
+{
+ enum usb_device_state state = bdc->gadget.state;
+ struct bdc_ep *ep;
+ u16 wValue;
+ u16 wIndex;
+ int epnum;
+
+ wValue = le16_to_cpu(setup_pkt->wValue);
+ wIndex = le16_to_cpu(setup_pkt->wIndex);
+
+ dev_dbg(bdc->dev,
+ "%s wValue=%d wIndex=%d devstate=%08x speed=%d set=%d",
+ __func__, wValue, wIndex, state,
+ bdc->gadget.speed, set);
+
+ switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ return ep0_handle_feature_dev(bdc, wValue, wIndex, set);
+ case USB_RECIP_INTERFACE:
+ dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
+ /* USB3 spec, sec 9.4.9 */
+ if (wValue != USB_INTRF_FUNC_SUSPEND)
+ return -EINVAL;
+ /* USB3 spec, Table 9-8 */
+ if (set) {
+ if (wIndex & USB_INTRF_FUNC_SUSPEND_RW) {
+ dev_dbg(bdc->dev, "SET REMOTE_WAKEUP\n");
+ bdc->devstatus |= REMOTE_WAKE_ENABLE;
+ } else {
+ dev_dbg(bdc->dev, "CLEAR REMOTE_WAKEUP\n");
+ bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
+ }
+ }
+ break;
+
+ case USB_RECIP_ENDPOINT:
+ dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
+ if (wValue != USB_ENDPOINT_HALT)
+ return -EINVAL;
+
+ epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
+ if (epnum) {
+ if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
+ epnum = epnum * 2 + 1;
+ else
+ epnum *= 2;
+ } else {
+ epnum = 1; /*EP0*/
+ }
+ /*
+ * If CLEAR_FEATURE on ep0 then don't do anything as the stall
+ * condition on ep0 has already been cleared when SETUP packet
+ * was received.
+ */
+ if (epnum == 1 && !set) {
+ dev_dbg(bdc->dev, "ep0 stall already cleared\n");
+ return 0;
+ }
+ dev_dbg(bdc->dev, "epnum=%d\n", epnum);
+ ep = bdc->bdc_ep_array[epnum];
+ if (!ep)
+ return -EINVAL;
+
+ return ep_set_halt(ep, set);
+ default:
+ dev_err(bdc->dev, "Unknown recipient\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* GET_STATUS request handler */
+static int ep0_handle_status(struct bdc *bdc,
+ struct usb_ctrlrequest *setup_pkt)
+{
+ enum usb_device_state state = bdc->gadget.state;
+ struct bdc_ep *ep;
+ u16 usb_status = 0;
+ u32 epnum;
+ u16 wIndex;
+
+ /* USB2.0 spec sec 9.4.5 */
+ if (state == USB_STATE_DEFAULT)
+ return -EINVAL;
+ wIndex = le16_to_cpu(setup_pkt->wIndex);
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ usb_status = bdc->devstatus;
+ switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ dev_dbg(bdc->dev,
+ "USB_RECIP_DEVICE devstatus:%08x\n",
+ bdc->devstatus);
+ /* USB3 spec, sec 9.4.5 */
+ if (bdc->gadget.speed == USB_SPEED_SUPER)
+ usb_status &= ~REMOTE_WAKE_ENABLE;
+ break;
+
+ case USB_RECIP_INTERFACE:
+ dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
+ if (bdc->gadget.speed == USB_SPEED_SUPER) {
+ /*
+ * This should come from func for Func remote wkup
+ * usb_status |=1;
+ */
+ if (bdc->devstatus & REMOTE_WAKE_ENABLE)
+ usb_status |= REMOTE_WAKE_ENABLE;
+ } else {
+ usb_status = 0;
+ }
+
+ break;
+
+ case USB_RECIP_ENDPOINT:
+ dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
+ epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
+ if (epnum) {
+ if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
+ epnum = epnum*2 + 1;
+ else
+ epnum *= 2;
+ } else {
+ epnum = 1; /* EP0 */
+ }
+
+ ep = bdc->bdc_ep_array[epnum];
+ if (!ep) {
+ dev_err(bdc->dev, "ISSUE, GET_STATUS for invalid EP ?");
+ return -EINVAL;
+ }
+ if (ep->flags & BDC_EP_STALL)
+ usb_status |= 1 << USB_ENDPOINT_HALT;
+
+ break;
+ default:
+ dev_err(bdc->dev, "Unknown recipient for get_status\n");
+ return -EINVAL;
+ }
+ /* prepare a data stage for GET_STATUS */
+ dev_dbg(bdc->dev, "usb_status=%08x\n", usb_status);
+ *(__le16 *)bdc->ep0_response_buff = cpu_to_le16(usb_status);
+ bdc->ep0_req.usb_req.length = 2;
+ bdc->ep0_req.usb_req.buf = &bdc->ep0_response_buff;
+ ep0_queue_data_stage(bdc);
+
+ return 0;
+}
+
+static void ep0_set_sel_cmpl(struct usb_ep *_ep, struct usb_request *_req)
+{
+ /* ep0_set_sel_cmpl */
+}
+
+/* Queue data stage to handle 6 byte SET_SEL request */
+static int ep0_set_sel(struct bdc *bdc,
+ struct usb_ctrlrequest *setup_pkt)
+{
+ struct bdc_ep *ep;
+ u16 wLength;
+ u16 wValue;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ wValue = le16_to_cpu(setup_pkt->wValue);
+ wLength = le16_to_cpu(setup_pkt->wLength);
+ if (unlikely(wLength != 6)) {
+ dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
+ return -EINVAL;
+ }
+ ep = bdc->bdc_ep_array[1];
+ bdc->ep0_req.ep = ep;
+ bdc->ep0_req.usb_req.length = 6;
+ bdc->ep0_req.usb_req.buf = bdc->ep0_response_buff;
+ bdc->ep0_req.usb_req.complete = ep0_set_sel_cmpl;
+ ep0_queue_data_stage(bdc);
+
+ return 0;
+}
+
+/*
+ * Queue a 0 byte bd only if wLength is more than the length and and length is
+ * a multiple of MaxPacket then queue 0 byte BD
+ */
+static int ep0_queue_zlp(struct bdc *bdc)
+{
+ int ret;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ bdc->ep0_req.ep = bdc->bdc_ep_array[1];
+ bdc->ep0_req.usb_req.length = 0;
+ bdc->ep0_req.usb_req.complete = NULL;
+ bdc->ep0_state = WAIT_FOR_DATA_START;
+ ret = bdc_queue_xfr(bdc, &bdc->ep0_req);
+ if (ret) {
+ dev_err(bdc->dev, "err queueing zlp :%d\n", ret);
+ return ret;
+ }
+ bdc->ep0_state = WAIT_FOR_DATA_XMIT;
+
+ return 0;
+}
+
+/* Control request handler */
+static int handle_control_request(struct bdc *bdc)
+{
+ enum usb_device_state state = bdc->gadget.state;
+ struct usb_ctrlrequest *setup_pkt;
+ int delegate_setup = 0;
+ int ret = 0;
+ int config = 0;
+
+ setup_pkt = &bdc->setup_pkt;
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ if ((setup_pkt->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+ switch (setup_pkt->bRequest) {
+ case USB_REQ_SET_ADDRESS:
+ dev_dbg(bdc->dev, "USB_REQ_SET_ADDRESS\n");
+ ret = ep0_set_address(bdc, setup_pkt);
+ bdc->devstatus &= DEVSTATUS_CLEAR;
+ break;
+
+ case USB_REQ_SET_CONFIGURATION:
+ dev_dbg(bdc->dev, "USB_REQ_SET_CONFIGURATION\n");
+ if (state == USB_STATE_ADDRESS) {
+ usb_gadget_set_state(&bdc->gadget,
+ USB_STATE_CONFIGURED);
+ } else if (state == USB_STATE_CONFIGURED) {
+ /*
+ * USB2 spec sec 9.4.7, if wValue is 0 then dev
+ * is moved to addressed state
+ */
+ config = le16_to_cpu(setup_pkt->wValue);
+ if (!config)
+ usb_gadget_set_state(
+ &bdc->gadget,
+ USB_STATE_ADDRESS);
+ }
+ delegate_setup = 1;
+ break;
+
+ case USB_REQ_SET_FEATURE:
+ dev_dbg(bdc->dev, "USB_REQ_SET_FEATURE\n");
+ ret = ep0_handle_feature(bdc, setup_pkt, 1);
+ break;
+
+ case USB_REQ_CLEAR_FEATURE:
+ dev_dbg(bdc->dev, "USB_REQ_CLEAR_FEATURE\n");
+ ret = ep0_handle_feature(bdc, setup_pkt, 0);
+ break;
+
+ case USB_REQ_GET_STATUS:
+ dev_dbg(bdc->dev, "USB_REQ_GET_STATUS\n");
+ ret = ep0_handle_status(bdc, setup_pkt);
+ break;
+
+ case USB_REQ_SET_SEL:
+ dev_dbg(bdc->dev, "USB_REQ_SET_SEL\n");
+ ret = ep0_set_sel(bdc, setup_pkt);
+ break;
+
+ case USB_REQ_SET_ISOCH_DELAY:
+ dev_warn(bdc->dev,
+ "USB_REQ_SET_ISOCH_DELAY not handled\n");
+ ret = 0;
+ break;
+ default:
+ delegate_setup = 1;
+ }
+ } else {
+ delegate_setup = 1;
+ }
+
+ if (delegate_setup) {
+ spin_unlock(&bdc->lock);
+ ret = bdc->gadget_driver->setup(&bdc->gadget, setup_pkt);
+ spin_lock(&bdc->lock);
+ }
+
+ return ret;
+}
+
+/* EP0: Data stage started */
+void bdc_xsf_ep0_data_start(struct bdc *bdc, struct bdc_sr *sreport)
+{
+ struct bdc_ep *ep;
+ int ret = 0;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ ep = bdc->bdc_ep_array[1];
+ /* If ep0 was stalled, the clear it first */
+ if (ep->flags & BDC_EP_STALL) {
+ ret = ep_set_halt(ep, 0);
+ if (ret)
+ goto err;
+ }
+ if (bdc->ep0_state != WAIT_FOR_DATA_START)
+ dev_warn(bdc->dev,
+ "Data stage not expected ep0_state:%s\n",
+ ep0_state_string[bdc->ep0_state]);
+
+ ret = handle_control_request(bdc);
+ if (ret == USB_GADGET_DELAYED_STATUS) {
+ /*
+ * The ep0 state will remain WAIT_FOR_DATA_START till
+ * we received ep_queue on ep0
+ */
+ bdc->delayed_status = true;
+ return;
+ }
+ if (!ret) {
+ bdc->ep0_state = WAIT_FOR_DATA_XMIT;
+ dev_dbg(bdc->dev,
+ "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
+ return;
+ }
+err:
+ ep0_stall(bdc);
+}
+
+/* EP0: status stage started */
+void bdc_xsf_ep0_status_start(struct bdc *bdc, struct bdc_sr *sreport)
+{
+ struct usb_ctrlrequest *setup_pkt;
+ struct bdc_ep *ep;
+ int ret = 0;
+
+ dev_dbg(bdc->dev,
+ "%s ep0_state:%s",
+ __func__, ep0_state_string[bdc->ep0_state]);
+ ep = bdc->bdc_ep_array[1];
+
+ /* check if ZLP was queued? */
+ if (bdc->zlp_needed)
+ bdc->zlp_needed = false;
+
+ if (ep->flags & BDC_EP_STALL) {
+ ret = ep_set_halt(ep, 0);
+ if (ret)
+ goto err;
+ }
+
+ if ((bdc->ep0_state != WAIT_FOR_STATUS_START) &&
+ (bdc->ep0_state != WAIT_FOR_DATA_XMIT))
+ dev_err(bdc->dev,
+ "Status stage recv but ep0_state:%s\n",
+ ep0_state_string[bdc->ep0_state]);
+
+ /* check if data stage is in progress ? */
+ if (bdc->ep0_state == WAIT_FOR_DATA_XMIT) {
+ bdc->ep0_state = STATUS_PENDING;
+ /* Status stage will be queued upon Data stage transmit event */
+ dev_dbg(bdc->dev,
+ "status started but data not transmitted yet\n");
+ return;
+ }
+ setup_pkt = &bdc->setup_pkt;
+
+ /*
+ * 2 stage setup then only process the setup, for 3 stage setup the date
+ * stage is already handled
+ */
+ if (!le16_to_cpu(setup_pkt->wLength)) {
+ ret = handle_control_request(bdc);
+ if (ret == USB_GADGET_DELAYED_STATUS) {
+ bdc->delayed_status = true;
+ /* ep0_state will remain WAIT_FOR_STATUS_START */
+ return;
+ }
+ }
+ if (!ret) {
+ /* Queue a status stage BD */
+ ep0_queue_status_stage(bdc);
+ bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
+ dev_dbg(bdc->dev,
+ "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
+ return;
+ }
+err:
+ ep0_stall(bdc);
+}
+
+/* Helper function to update ep0 upon SR with xsf_succ or xsf_short */
+static void ep0_xsf_complete(struct bdc *bdc, struct bdc_sr *sreport)
+{
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ switch (bdc->ep0_state) {
+ case WAIT_FOR_DATA_XMIT:
+ bdc->ep0_state = WAIT_FOR_STATUS_START;
+ break;
+ case WAIT_FOR_STATUS_XMIT:
+ bdc->ep0_state = WAIT_FOR_SETUP;
+ if (bdc->test_mode) {
+ int ret;
+
+ dev_dbg(bdc->dev, "test_mode:%d\n", bdc->test_mode);
+ ret = bdc_set_test_mode(bdc);
+ if (ret < 0) {
+ dev_err(bdc->dev, "Err in setting Test mode\n");
+ return;
+ }
+ bdc->test_mode = 0;
+ }
+ break;
+ case STATUS_PENDING:
+ bdc_xsf_ep0_status_start(bdc, sreport);
+ break;
+
+ default:
+ dev_err(bdc->dev,
+ "Unknown ep0_state:%s\n",
+ ep0_state_string[bdc->ep0_state]);
+
+ }
+}
+
+/* xfr completion status report handler */
+void bdc_sr_xsf(struct bdc *bdc, struct bdc_sr *sreport)
+{
+ struct bdc_ep *ep;
+ u32 sr_status;
+ u8 ep_num;
+
+ ep_num = (le32_to_cpu(sreport->offset[3])>>4) & 0x1f;
+ ep = bdc->bdc_ep_array[ep_num];
+ if (!ep || !(ep->flags & BDC_EP_ENABLED)) {
+ dev_err(bdc->dev, "xsf for ep not enabled\n");
+ return;
+ }
+ /*
+ * check if this transfer is after link went from U3->U0 due
+ * to remote wakeup
+ */
+ if (bdc->devstatus & FUNC_WAKE_ISSUED) {
+ bdc->devstatus &= ~(FUNC_WAKE_ISSUED);
+ dev_dbg(bdc->dev, "%s clearing FUNC_WAKE_ISSUED flag\n",
+ __func__);
+ }
+ sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
+ dev_dbg_ratelimited(bdc->dev, "%s sr_status=%d ep:%s\n",
+ __func__, sr_status, ep->name);
+
+ switch (sr_status) {
+ case XSF_SUCC:
+ case XSF_SHORT:
+ handle_xsr_succ_status(bdc, ep, sreport);
+ if (ep_num == 1)
+ ep0_xsf_complete(bdc, sreport);
+ break;
+
+ case XSF_SETUP_RECV:
+ case XSF_DATA_START:
+ case XSF_STATUS_START:
+ if (ep_num != 1) {
+ dev_err(bdc->dev,
+ "ep0 related packets on non ep0 endpoint");
+ return;
+ }
+ bdc->sr_xsf_ep0[sr_status - XSF_SETUP_RECV](bdc, sreport);
+ break;
+
+ case XSF_BABB:
+ if (ep_num == 1) {
+ dev_dbg(bdc->dev, "Babble on ep0 zlp_need:%d\n",
+ bdc->zlp_needed);
+ /*
+ * If the last completed transfer had wLength >Data Len,
+ * and Len is multiple of MaxPacket,then queue ZLP
+ */
+ if (bdc->zlp_needed) {
+ /* queue 0 length bd */
+ ep0_queue_zlp(bdc);
+ return;
+ }
+ }
+ dev_warn(bdc->dev, "Babble on ep not handled\n");
+ break;
+ default:
+ dev_warn(bdc->dev, "sr status not handled:%x\n", sr_status);
+ break;
+ }
+}
+
+static int bdc_gadget_ep_queue(struct usb_ep *_ep,
+ struct usb_request *_req, gfp_t gfp_flags)
+{
+ struct bdc_req *req;
+ unsigned long flags;
+ struct bdc_ep *ep;
+ struct bdc *bdc;
+ int ret;
+
+ if (!_ep || !_ep->desc)
+ return -ESHUTDOWN;
+
+ if (!_req || !_req->complete || !_req->buf)
+ return -EINVAL;
+
+ ep = to_bdc_ep(_ep);
+ req = to_bdc_req(_req);
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s ep:%p req:%p\n", __func__, ep, req);
+ dev_dbg(bdc->dev, "queuing request %p to %s length %d zero:%d\n",
+ _req, ep->name, _req->length, _req->zero);
+
+ if (!ep->usb_ep.desc) {
+ dev_warn(bdc->dev,
+ "trying to queue req %p to disabled %s\n",
+ _req, ep->name);
+ return -ESHUTDOWN;
+ }
+
+ if (_req->length > MAX_XFR_LEN) {
+ dev_warn(bdc->dev,
+ "req length > supported MAX:%d requested:%d\n",
+ MAX_XFR_LEN, _req->length);
+ return -EOPNOTSUPP;
+ }
+ spin_lock_irqsave(&bdc->lock, flags);
+ if (ep == bdc->bdc_ep_array[1])
+ ret = ep0_queue(ep, req);
+ else
+ ret = ep_queue(ep, req);
+
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static int bdc_gadget_ep_dequeue(struct usb_ep *_ep,
+ struct usb_request *_req)
+{
+ struct bdc_req *req;
+ unsigned long flags;
+ struct bdc_ep *ep;
+ struct bdc *bdc;
+ int ret;
+
+ if (!_ep || !_req)
+ return -EINVAL;
+
+ ep = to_bdc_ep(_ep);
+ req = to_bdc_req(_req);
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
+ bdc_dbg_bd_list(bdc, ep);
+ spin_lock_irqsave(&bdc->lock, flags);
+ /* make sure it's still queued on this endpoint */
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (&req->usb_req == _req)
+ break;
+ }
+ if (&req->usb_req != _req) {
+ spin_unlock_irqrestore(&bdc->lock, flags);
+ dev_err(bdc->dev, "usb_req !=req n");
+ return -EINVAL;
+ }
+ ret = ep_dequeue(ep, req);
+ if (ret) {
+ ret = -EOPNOTSUPP;
+ goto err;
+ }
+ bdc_req_complete(ep, req, -ECONNRESET);
+
+err:
+ bdc_dbg_bd_list(bdc, ep);
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static int bdc_gadget_ep_set_halt(struct usb_ep *_ep, int value)
+{
+ unsigned long flags;
+ struct bdc_ep *ep;
+ struct bdc *bdc;
+ int ret;
+
+ ep = to_bdc_ep(_ep);
+ bdc = ep->bdc;
+ dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
+ spin_lock_irqsave(&bdc->lock, flags);
+ if (usb_endpoint_xfer_isoc(ep->usb_ep.desc))
+ ret = -EINVAL;
+ else if (!list_empty(&ep->queue))
+ ret = -EAGAIN;
+ else
+ ret = ep_set_halt(ep, value);
+
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static struct usb_request *bdc_gadget_alloc_request(struct usb_ep *_ep,
+ gfp_t gfp_flags)
+{
+ struct bdc_req *req;
+ struct bdc_ep *ep;
+
+ req = kzalloc(sizeof(*req), gfp_flags);
+ if (!req)
+ return NULL;
+
+ ep = to_bdc_ep(_ep);
+ req->ep = ep;
+ req->epnum = ep->ep_num;
+ req->usb_req.dma = DMA_ADDR_INVALID;
+ dev_dbg(ep->bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
+
+ return &req->usb_req;
+}
+
+static void bdc_gadget_free_request(struct usb_ep *_ep,
+ struct usb_request *_req)
+{
+ struct bdc_req *req;
+
+ req = to_bdc_req(_req);
+ kfree(req);
+}
+
+/* endpoint operations */
+
+/* configure endpoint and also allocate resources */
+static int bdc_gadget_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ unsigned long flags;
+ struct bdc_ep *ep;
+ struct bdc *bdc;
+ int ret;
+
+ if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+ pr_debug("bdc_gadget_ep_enable invalid parameters\n");
+ return -EINVAL;
+ }
+
+ if (!desc->wMaxPacketSize) {
+ pr_debug("bdc_gadget_ep_enable missing wMaxPacketSize\n");
+ return -EINVAL;
+ }
+
+ ep = to_bdc_ep(_ep);
+ bdc = ep->bdc;
+
+ /* Sanity check, upper layer will not send enable for ep0 */
+ if (ep == bdc->bdc_ep_array[1])
+ return -EINVAL;
+
+ if (!bdc->gadget_driver
+ || bdc->gadget.speed == USB_SPEED_UNKNOWN) {
+ return -ESHUTDOWN;
+ }
+
+ dev_dbg(bdc->dev, "%s Enabling %s\n", __func__, ep->name);
+ spin_lock_irqsave(&bdc->lock, flags);
+ ep->desc = desc;
+ ep->comp_desc = _ep->comp_desc;
+ ret = bdc_ep_enable(ep);
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static int bdc_gadget_ep_disable(struct usb_ep *_ep)
+{
+ unsigned long flags;
+ struct bdc_ep *ep;
+ struct bdc *bdc;
+ int ret;
+
+ if (!_ep) {
+ pr_debug("bdc: invalid parameters\n");
+ return -EINVAL;
+ }
+ ep = to_bdc_ep(_ep);
+ bdc = ep->bdc;
+
+ /* Upper layer will not call this for ep0, but do a sanity check */
+ if (ep == bdc->bdc_ep_array[1]) {
+ dev_warn(bdc->dev, "%s called for ep0\n", __func__);
+ return -EINVAL;
+ }
+ dev_dbg(bdc->dev,
+ "%s() ep:%s ep->flags:%08x\n",
+ __func__, ep->name, ep->flags);
+
+ if (!(ep->flags & BDC_EP_ENABLED)) {
+ dev_warn(bdc->dev, "%s is already disabled\n", ep->name);
+ return 0;
+ }
+ spin_lock_irqsave(&bdc->lock, flags);
+ ret = bdc_ep_disable(ep);
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static const struct usb_ep_ops bdc_gadget_ep_ops = {
+ .enable = bdc_gadget_ep_enable,
+ .disable = bdc_gadget_ep_disable,
+ .alloc_request = bdc_gadget_alloc_request,
+ .free_request = bdc_gadget_free_request,
+ .queue = bdc_gadget_ep_queue,
+ .dequeue = bdc_gadget_ep_dequeue,
+ .set_halt = bdc_gadget_ep_set_halt
+};
+
+/* dir = 1 is IN */
+static int init_ep(struct bdc *bdc, u32 epnum, u32 dir)
+{
+ struct bdc_ep *ep;
+
+ dev_dbg(bdc->dev, "%s epnum=%d dir=%d\n", __func__, epnum, dir);
+ ep = kzalloc(sizeof(*ep), GFP_KERNEL);
+ if (!ep)
+ return -ENOMEM;
+
+ ep->bdc = bdc;
+ ep->dir = dir;
+
+ /* ep->ep_num is the index inside bdc_ep */
+ if (epnum == 1) {
+ ep->ep_num = 1;
+ bdc->bdc_ep_array[ep->ep_num] = ep;
+ snprintf(ep->name, sizeof(ep->name), "ep%d", epnum - 1);
+ usb_ep_set_maxpacket_limit(&ep->usb_ep, EP0_MAX_PKT_SIZE);
+ ep->comp_desc = NULL;
+ bdc->gadget.ep0 = &ep->usb_ep;
+ } else {
+ if (dir)
+ ep->ep_num = epnum * 2 - 1;
+ else
+ ep->ep_num = epnum * 2 - 2;
+
+ bdc->bdc_ep_array[ep->ep_num] = ep;
+ snprintf(ep->name, sizeof(ep->name), "ep%d%s", epnum - 1,
+ dir & 1 ? "in" : "out");
+
+ usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
+ ep->usb_ep.max_streams = 0;
+ list_add_tail(&ep->usb_ep.ep_list, &bdc->gadget.ep_list);
+ }
+ ep->usb_ep.ops = &bdc_gadget_ep_ops;
+ ep->usb_ep.name = ep->name;
+ ep->flags = 0;
+ ep->ignore_next_sr = false;
+ dev_dbg(bdc->dev, "ep=%p ep->usb_ep.name=%s epnum=%d ep->epnum=%d\n",
+ ep, ep->usb_ep.name, epnum, ep->ep_num);
+
+ INIT_LIST_HEAD(&ep->queue);
+
+ return 0;
+}
+
+/* Init all ep */
+int bdc_init_ep(struct bdc *bdc)
+{
+ u8 epnum;
+ int ret;
+
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ INIT_LIST_HEAD(&bdc->gadget.ep_list);
+ /* init ep0 */
+ ret = init_ep(bdc, 1, 0);
+ if (ret) {
+ dev_err(bdc->dev, "init ep ep0 fail %d\n", ret);
+ return ret;
+ }
+
+ for (epnum = 2; epnum <= bdc->num_eps / 2; epnum++) {
+ /* OUT */
+ ret = init_ep(bdc, epnum, 0);
+ if (ret) {
+ dev_err(bdc->dev,
+ "init ep failed for:%d error: %d\n",
+ epnum, ret);
+ return ret;
+ }
+
+ /* IN */
+ ret = init_ep(bdc, epnum, 1);
+ if (ret) {
+ dev_err(bdc->dev,
+ "init ep failed for:%d error: %d\n",
+ epnum, ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
--- /dev/null
+/*
+ * bdc_ep.h - header for the BDC debug functions
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * 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.
+ *
+ */
+#ifndef __LINUX_BDC_EP_H__
+#define __LINUX_BDC_EP_H__
+
+int bdc_init_ep(struct bdc *);
+int bdc_ep_disable(struct bdc_ep *);
+int bdc_ep_enable(struct bdc_ep *);
+void bdc_free_ep(struct bdc *);
+
+#endif /* __LINUX_BDC_EP_H__ */
--- /dev/null
+/*
+ * bdc_pci.c - BRCM BDC USB3.0 device controller PCI interface file.
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * Based on drivers under drivers/usb/
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/platform_device.h>
+
+#include "bdc.h"
+
+#define BDC_PCI_PID 0x1570
+
+struct bdc_pci {
+ struct device *dev;
+ struct platform_device *bdc;
+};
+
+static int bdc_setup_msi(struct pci_dev *pci)
+{
+ int ret;
+
+ ret = pci_enable_msi(pci);
+ if (ret) {
+ pr_err("failed to allocate MSI entry\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int bdc_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
+{
+ struct resource res[2];
+ struct platform_device *bdc;
+ struct bdc_pci *glue;
+ int ret = -ENOMEM;
+
+ glue = devm_kzalloc(&pci->dev, sizeof(*glue), GFP_KERNEL);
+ if (!glue)
+ return -ENOMEM;
+
+ glue->dev = &pci->dev;
+ ret = pci_enable_device(pci);
+ if (ret) {
+ dev_err(&pci->dev, "failed to enable pci device\n");
+ return -ENODEV;
+ }
+ pci_set_master(pci);
+
+ bdc = platform_device_alloc(BRCM_BDC_NAME, PLATFORM_DEVID_AUTO);
+ if (!bdc)
+ return -ENOMEM;
+
+ memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
+ bdc_setup_msi(pci);
+
+ res[0].start = pci_resource_start(pci, 0);
+ res[0].end = pci_resource_end(pci, 0);
+ res[0].name = BRCM_BDC_NAME;
+ res[0].flags = IORESOURCE_MEM;
+
+ res[1].start = pci->irq;
+ res[1].name = BRCM_BDC_NAME;
+ res[1].flags = IORESOURCE_IRQ;
+
+ ret = platform_device_add_resources(bdc, res, ARRAY_SIZE(res));
+ if (ret) {
+ dev_err(&pci->dev,
+ "couldn't add resources to bdc device\n");
+ return ret;
+ }
+
+ pci_set_drvdata(pci, glue);
+
+ dma_set_coherent_mask(&bdc->dev, pci->dev.coherent_dma_mask);
+
+ bdc->dev.dma_mask = pci->dev.dma_mask;
+ bdc->dev.dma_parms = pci->dev.dma_parms;
+ bdc->dev.parent = &pci->dev;
+ glue->bdc = bdc;
+
+ ret = platform_device_add(bdc);
+ if (ret) {
+ dev_err(&pci->dev, "failed to register bdc device\n");
+ platform_device_put(bdc);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void bdc_pci_remove(struct pci_dev *pci)
+{
+ struct bdc_pci *glue = pci_get_drvdata(pci);
+
+ platform_device_unregister(glue->bdc);
+ pci_disable_msi(pci);
+}
+
+static struct pci_device_id bdc_pci_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, BDC_PCI_PID), },
+ {} /* Terminating Entry */
+};
+
+MODULE_DEVICE_TABLE(pci, bdc_pci_id_table);
+
+static struct pci_driver bdc_pci_driver = {
+ .name = "bdc-pci",
+ .id_table = bdc_pci_id_table,
+ .probe = bdc_pci_probe,
+ .remove = bdc_pci_remove,
+};
+
+MODULE_AUTHOR("Ashwini Pahuja <ashwini.linux@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("BRCM BDC USB3 PCI Glue layer");
+module_pci_driver(bdc_pci_driver);
--- /dev/null
+/*
+ * bdc_udc.c - BRCM BDC USB3.0 device controller gagdet ops
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * Author: Ashwini Pahuja
+ *
+ * Based on drivers under drivers/usb/gadget/udc/
+ *
+ * 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.
+ *
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <asm/unaligned.h>
+#include <linux/platform_device.h>
+
+#include "bdc.h"
+#include "bdc_ep.h"
+#include "bdc_cmd.h"
+#include "bdc_dbg.h"
+
+static const struct usb_gadget_ops bdc_gadget_ops;
+
+static const char * const conn_speed_str[] = {
+ "Not connected",
+ "Full Speed",
+ "Low Speed",
+ "High Speed",
+ "Super Speed",
+};
+
+/* EP0 initial descripror */
+static struct usb_endpoint_descriptor bdc_gadget_ep0_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ .bEndpointAddress = 0,
+ .wMaxPacketSize = cpu_to_le16(EP0_MAX_PKT_SIZE),
+};
+
+/* Advance the srr dqp maintained by SW */
+static void srr_dqp_index_advc(struct bdc *bdc, u32 srr_num)
+{
+ struct srr *srr;
+
+ srr = &bdc->srr;
+ dev_dbg_ratelimited(bdc->dev, "srr->dqp_index:%d\n", srr->dqp_index);
+ srr->dqp_index++;
+ /* rollback to 0 if we are past the last */
+ if (srr->dqp_index == NUM_SR_ENTRIES)
+ srr->dqp_index = 0;
+}
+
+/* connect sr */
+static void bdc_uspc_connected(struct bdc *bdc)
+{
+ u32 speed, temp;
+ u32 usppms;
+ int ret;
+
+ temp = bdc_readl(bdc->regs, BDC_USPC);
+ speed = BDC_PSP(temp);
+ dev_dbg(bdc->dev, "%s speed=%x\n", __func__, speed);
+ switch (speed) {
+ case BDC_SPEED_SS:
+ bdc_gadget_ep0_desc.wMaxPacketSize =
+ cpu_to_le16(EP0_MAX_PKT_SIZE);
+ bdc->gadget.ep0->maxpacket = EP0_MAX_PKT_SIZE;
+ bdc->gadget.speed = USB_SPEED_SUPER;
+ /* Enable U1T in SS mode */
+ usppms = bdc_readl(bdc->regs, BDC_USPPMS);
+ usppms &= ~BDC_U1T(0xff);
+ usppms |= BDC_U1T(U1_TIMEOUT);
+ usppms |= BDC_PORT_W1S;
+ bdc_writel(bdc->regs, BDC_USPPMS, usppms);
+ break;
+
+ case BDC_SPEED_HS:
+ bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
+ bdc->gadget.ep0->maxpacket = 64;
+ bdc->gadget.speed = USB_SPEED_HIGH;
+ break;
+
+ case BDC_SPEED_FS:
+ bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
+ bdc->gadget.ep0->maxpacket = 64;
+ bdc->gadget.speed = USB_SPEED_FULL;
+ break;
+
+ case BDC_SPEED_LS:
+ bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
+ bdc->gadget.ep0->maxpacket = 8;
+ bdc->gadget.speed = USB_SPEED_LOW;
+ break;
+ default:
+ dev_err(bdc->dev, "UNDEFINED SPEED\n");
+ return;
+ }
+ dev_dbg(bdc->dev, "connected at %s\n", conn_speed_str[speed]);
+ /* Now we know the speed, configure ep0 */
+ bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc;
+ ret = bdc_config_ep(bdc, bdc->bdc_ep_array[1]);
+ if (ret)
+ dev_err(bdc->dev, "EP0 config failed\n");
+ bdc->bdc_ep_array[1]->usb_ep.desc = &bdc_gadget_ep0_desc;
+ bdc->bdc_ep_array[1]->flags |= BDC_EP_ENABLED;
+ usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
+}
+
+/* device got disconnected */
+static void bdc_uspc_disconnected(struct bdc *bdc, bool reinit)
+{
+ struct bdc_ep *ep;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ /*
+ * Only stop ep0 from here, rest of the endpoints will be disabled
+ * from gadget_disconnect
+ */
+ ep = bdc->bdc_ep_array[1];
+ if (ep && (ep->flags & BDC_EP_ENABLED))
+ /* if enabled then stop and remove requests */
+ bdc_ep_disable(ep);
+
+ if (bdc->gadget_driver && bdc->gadget_driver->disconnect) {
+ spin_unlock(&bdc->lock);
+ bdc->gadget_driver->disconnect(&bdc->gadget);
+ spin_lock(&bdc->lock);
+ }
+ /* Set Unknown speed */
+ bdc->gadget.speed = USB_SPEED_UNKNOWN;
+ bdc->devstatus &= DEVSTATUS_CLEAR;
+ bdc->delayed_status = false;
+ bdc->reinit = reinit;
+ bdc->test_mode = false;
+}
+
+/* TNotify wkaeup timer */
+static void bdc_func_wake_timer(struct work_struct *work)
+{
+ struct bdc *bdc = container_of(work, struct bdc, func_wake_notify.work);
+ unsigned long flags;
+
+ dev_dbg(bdc->dev, "%s\n", __func__);
+ spin_lock_irqsave(&bdc->lock, flags);
+ /*
+ * Check if host has started transferring on endpoints
+ * FUNC_WAKE_ISSUED is cleared when transfer has started after resume
+ */
+ if (bdc->devstatus & FUNC_WAKE_ISSUED) {
+ dev_dbg(bdc->dev, "FUNC_WAKE_ISSUED FLAG IS STILL SET\n");
+ /* flag is still set, so again send func wake */
+ bdc_function_wake_fh(bdc, 0);
+ schedule_delayed_work(&bdc->func_wake_notify,
+ msecs_to_jiffies(BDC_TNOTIFY));
+ }
+ spin_unlock_irqrestore(&bdc->lock, flags);
+}
+
+/* handler for Link state change condition */
+static void handle_link_state_change(struct bdc *bdc, u32 uspc)
+{
+ u32 link_state;
+
+ dev_dbg(bdc->dev, "Link state change");
+ link_state = BDC_PST(uspc);
+ switch (link_state) {
+ case BDC_LINK_STATE_U3:
+ if ((bdc->gadget.speed != USB_SPEED_UNKNOWN) &&
+ bdc->gadget_driver->suspend) {
+ dev_dbg(bdc->dev, "Entered Suspend mode\n");
+ spin_unlock(&bdc->lock);
+ bdc->devstatus |= DEVICE_SUSPENDED;
+ bdc->gadget_driver->suspend(&bdc->gadget);
+ spin_lock(&bdc->lock);
+ }
+ break;
+ case BDC_LINK_STATE_U0:
+ if (bdc->devstatus & REMOTE_WAKEUP_ISSUED) {
+ bdc->devstatus &= ~REMOTE_WAKEUP_ISSUED;
+ if (bdc->gadget.speed == USB_SPEED_SUPER) {
+ bdc_function_wake_fh(bdc, 0);
+ bdc->devstatus |= FUNC_WAKE_ISSUED;
+ /*
+ * Start a Notification timer and check if the
+ * Host transferred anything on any of the EPs,
+ * if not then send function wake again every
+ * TNotification secs until host initiates
+ * transfer to BDC, USB3 spec Table 8.13
+ */
+ schedule_delayed_work(
+ &bdc->func_wake_notify,
+ msecs_to_jiffies(BDC_TNOTIFY));
+ dev_dbg(bdc->dev, "sched func_wake_notify\n");
+ }
+ }
+ break;
+
+ case BDC_LINK_STATE_RESUME:
+ dev_dbg(bdc->dev, "Resumed from Suspend\n");
+ if (bdc->devstatus & DEVICE_SUSPENDED) {
+ bdc->gadget_driver->resume(&bdc->gadget);
+ bdc->devstatus &= ~DEVICE_SUSPENDED;
+ }
+ break;
+ default:
+ dev_dbg(bdc->dev, "link state:%d\n", link_state);
+ }
+}
+
+/* something changes on upstream port, handle it here */
+void bdc_sr_uspc(struct bdc *bdc, struct bdc_sr *sreport)
+{
+ u32 clear_flags = 0;
+ u32 uspc;
+ bool connected = false;
+ bool disconn = false;
+
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ dev_dbg(bdc->dev, "%s uspc=0x%08x\n", __func__, uspc);
+
+ /* Port connect changed */
+ if (uspc & BDC_PCC) {
+ /* Vbus not present, and not connected to Downstream port */
+ if ((uspc & BDC_VBC) && !(uspc & BDC_VBS) && !(uspc & BDC_PCS))
+ disconn = true;
+ else if ((uspc & BDC_PCS) && !BDC_PST(uspc))
+ connected = true;
+ }
+
+ /* Change in VBus and VBus is present */
+ if ((uspc & BDC_VBC) && (uspc & BDC_VBS)) {
+ if (bdc->pullup) {
+ dev_dbg(bdc->dev, "Do a softconnect\n");
+ /* Attached state, do a softconnect */
+ bdc_softconn(bdc);
+ usb_gadget_set_state(&bdc->gadget, USB_STATE_POWERED);
+ }
+ clear_flags = BDC_VBC;
+ } else if ((uspc & BDC_PRS) || (uspc & BDC_PRC) || disconn) {
+ /* Hot reset, warm reset, 2.0 bus reset or disconn */
+ dev_dbg(bdc->dev, "Port reset or disconn\n");
+ bdc_uspc_disconnected(bdc, disconn);
+ clear_flags = BDC_PCC|BDC_PCS|BDC_PRS|BDC_PRC;
+ } else if ((uspc & BDC_PSC) && (uspc & BDC_PCS)) {
+ /* Change in Link state */
+ handle_link_state_change(bdc, uspc);
+ clear_flags = BDC_PSC|BDC_PCS;
+ }
+
+ /*
+ * In SS we might not have PRC bit set before connection, but in 2.0
+ * the PRC bit is set before connection, so moving this condition out
+ * of bus reset to handle both SS/2.0 speeds.
+ */
+ if (connected) {
+ /* This is the connect event for U0/L0 */
+ dev_dbg(bdc->dev, "Connected\n");
+ bdc_uspc_connected(bdc);
+ bdc->devstatus &= ~(DEVICE_SUSPENDED);
+ }
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ uspc &= (~BDC_USPSC_RW);
+ dev_dbg(bdc->dev, "uspc=%x\n", uspc);
+ bdc_writel(bdc->regs, BDC_USPC, clear_flags);
+}
+
+/* Main interrupt handler for bdc */
+static irqreturn_t bdc_udc_interrupt(int irq, void *_bdc)
+{
+ u32 eqp_index, dqp_index, sr_type, srr_int;
+ struct bdc_sr *sreport;
+ struct bdc *bdc = _bdc;
+ u32 status;
+ int ret;
+
+ spin_lock(&bdc->lock);
+ status = bdc_readl(bdc->regs, BDC_BDCSC);
+ if (!(status & BDC_GIP)) {
+ spin_unlock(&bdc->lock);
+ return IRQ_NONE;
+ }
+ srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
+ /* Check if the SRR IP bit it set? */
+ if (!(srr_int & BDC_SRR_IP)) {
+ dev_warn(bdc->dev, "Global irq pending but SRR IP is 0\n");
+ spin_unlock(&bdc->lock);
+ return IRQ_NONE;
+ }
+ eqp_index = BDC_SRR_EPI(srr_int);
+ dqp_index = BDC_SRR_DPI(srr_int);
+ dev_dbg(bdc->dev,
+ "%s eqp_index=%d dqp_index=%d srr.dqp_index=%d\n\n",
+ __func__, eqp_index, dqp_index, bdc->srr.dqp_index);
+
+ /* check for ring empty condition */
+ if (eqp_index == dqp_index) {
+ dev_dbg(bdc->dev, "SRR empty?\n");
+ spin_unlock(&bdc->lock);
+ return IRQ_HANDLED;
+ }
+
+ while (bdc->srr.dqp_index != eqp_index) {
+ sreport = &bdc->srr.sr_bds[bdc->srr.dqp_index];
+ /* sreport is read before using it */
+ rmb();
+ sr_type = le32_to_cpu(sreport->offset[3]) & BD_TYPE_BITMASK;
+ dev_dbg_ratelimited(bdc->dev, "sr_type=%d\n", sr_type);
+ switch (sr_type) {
+ case SR_XSF:
+ bdc->sr_handler[0](bdc, sreport);
+ break;
+
+ case SR_USPC:
+ bdc->sr_handler[1](bdc, sreport);
+ break;
+ default:
+ dev_warn(bdc->dev, "SR:%d not handled\n", sr_type);
+ }
+ /* Advance the srr dqp index */
+ srr_dqp_index_advc(bdc, 0);
+ }
+ /* update the hw dequeue pointer */
+ srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
+ srr_int &= ~BDC_SRR_DPI_MASK;
+ srr_int &= ~(BDC_SRR_RWS|BDC_SRR_RST|BDC_SRR_ISR);
+ srr_int |= ((bdc->srr.dqp_index) << 16);
+ srr_int |= BDC_SRR_IP;
+ bdc_writel(bdc->regs, BDC_SRRINT(0), srr_int);
+ srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
+ if (bdc->reinit) {
+ ret = bdc_reinit(bdc);
+ if (ret)
+ dev_err(bdc->dev, "err in bdc reinit\n");
+ }
+
+ spin_unlock(&bdc->lock);
+
+ return IRQ_HANDLED;
+}
+
+/* Gadget ops */
+static int bdc_udc_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct bdc *bdc = gadget_to_bdc(gadget);
+ unsigned long flags;
+ int ret = 0;
+
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ spin_lock_irqsave(&bdc->lock, flags);
+ if (bdc->gadget_driver) {
+ dev_err(bdc->dev, "%s is already bound to %s\n",
+ bdc->gadget.name,
+ bdc->gadget_driver->driver.name);
+ ret = -EBUSY;
+ goto err;
+ }
+ /*
+ * Run the controller from here and when BDC is connected to
+ * Host then driver will receive a USPC SR with VBUS present
+ * and then driver will do a softconnect.
+ */
+ ret = bdc_run(bdc);
+ if (ret) {
+ dev_err(bdc->dev, "%s bdc run fail\n", __func__);
+ goto err;
+ }
+ bdc->gadget_driver = driver;
+ bdc->gadget.dev.driver = &driver->driver;
+err:
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static int bdc_udc_stop(struct usb_gadget *gadget)
+{
+ struct bdc *bdc = gadget_to_bdc(gadget);
+ unsigned long flags;
+
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ spin_lock_irqsave(&bdc->lock, flags);
+ bdc_stop(bdc);
+ bdc->gadget_driver = NULL;
+ bdc->gadget.dev.driver = NULL;
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return 0;
+}
+
+static int bdc_udc_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct bdc *bdc = gadget_to_bdc(gadget);
+ unsigned long flags;
+ u32 uspc;
+
+ dev_dbg(bdc->dev, "%s() is_on:%d\n", __func__, is_on);
+ if (!gadget)
+ return -EINVAL;
+
+ spin_lock_irqsave(&bdc->lock, flags);
+ if (!is_on) {
+ bdc_softdisconn(bdc);
+ bdc->pullup = false;
+ } else {
+ /*
+ * For a self powered device, we need to wait till we receive
+ * a VBUS change and Vbus present event, then if pullup flag
+ * is set, then only we present the Termintation.
+ */
+ bdc->pullup = true;
+ /*
+ * Check if BDC is already connected to Host i.e Vbus=1,
+ * if yes, then present TERM now, this is typical for bus
+ * powered devices.
+ */
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ if (uspc & BDC_VBS)
+ bdc_softconn(bdc);
+ }
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return 0;
+}
+
+static int bdc_udc_set_selfpowered(struct usb_gadget *gadget,
+ int is_self)
+{
+ struct bdc *bdc = gadget_to_bdc(gadget);
+ unsigned long flags;
+
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ spin_lock_irqsave(&bdc->lock, flags);
+ if (!is_self)
+ bdc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
+ else
+ bdc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return 0;
+}
+
+static int bdc_udc_wakeup(struct usb_gadget *gadget)
+{
+ struct bdc *bdc = gadget_to_bdc(gadget);
+ unsigned long flags;
+ u8 link_state;
+ u32 uspc;
+ int ret = 0;
+
+ dev_dbg(bdc->dev,
+ "%s() bdc->devstatus=%08x\n",
+ __func__, bdc->devstatus);
+
+ if (!(bdc->devstatus & REMOTE_WAKE_ENABLE))
+ return -EOPNOTSUPP;
+
+ spin_lock_irqsave(&bdc->lock, flags);
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ link_state = BDC_PST(uspc);
+ dev_dbg(bdc->dev, "link_state =%d portsc=%x", link_state, uspc);
+ if (link_state != BDC_LINK_STATE_U3) {
+ dev_warn(bdc->dev,
+ "can't wakeup from link state %d\n",
+ link_state);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (bdc->gadget.speed == USB_SPEED_SUPER)
+ bdc->devstatus |= REMOTE_WAKEUP_ISSUED;
+
+ uspc &= ~BDC_PST_MASK;
+ uspc &= (~BDC_USPSC_RW);
+ uspc |= BDC_PST(BDC_LINK_STATE_U0);
+ uspc |= BDC_SWS;
+ bdc_writel(bdc->regs, BDC_USPC, uspc);
+ uspc = bdc_readl(bdc->regs, BDC_USPC);
+ link_state = BDC_PST(uspc);
+ dev_dbg(bdc->dev, "link_state =%d portsc=%x", link_state, uspc);
+out:
+ spin_unlock_irqrestore(&bdc->lock, flags);
+
+ return ret;
+}
+
+static const struct usb_gadget_ops bdc_gadget_ops = {
+ .wakeup = bdc_udc_wakeup,
+ .set_selfpowered = bdc_udc_set_selfpowered,
+ .pullup = bdc_udc_pullup,
+ .udc_start = bdc_udc_start,
+ .udc_stop = bdc_udc_stop,
+};
+
+/* Init the gadget interface and register the udc */
+int bdc_udc_init(struct bdc *bdc)
+{
+ u32 temp;
+ int ret;
+
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ bdc->gadget.ops = &bdc_gadget_ops;
+ bdc->gadget.max_speed = USB_SPEED_SUPER;
+ bdc->gadget.speed = USB_SPEED_UNKNOWN;
+ bdc->gadget.dev.parent = bdc->dev;
+
+ bdc->gadget.sg_supported = false;
+
+
+ bdc->gadget.name = BRCM_BDC_NAME;
+ ret = devm_request_irq(bdc->dev, bdc->irq, bdc_udc_interrupt,
+ IRQF_SHARED , BRCM_BDC_NAME, bdc);
+ if (ret) {
+ dev_err(bdc->dev,
+ "failed to request irq #%d %d\n",
+ bdc->irq, ret);
+ return ret;
+ }
+
+ ret = bdc_init_ep(bdc);
+ if (ret) {
+ dev_err(bdc->dev, "bdc init ep fail: %d\n", ret);
+ return ret;
+ }
+
+ ret = usb_add_gadget_udc(bdc->dev, &bdc->gadget);
+ if (ret) {
+ dev_err(bdc->dev, "failed to register udc\n");
+ goto err0;
+ }
+ usb_gadget_set_state(&bdc->gadget, USB_STATE_NOTATTACHED);
+ bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc;
+ /*
+ * Allocate bd list for ep0 only, ep0 will be enabled on connect
+ * status report when the speed is known
+ */
+ ret = bdc_ep_enable(bdc->bdc_ep_array[1]);
+ if (ret) {
+ dev_err(bdc->dev, "fail to enable %s\n",
+ bdc->bdc_ep_array[1]->name);
+ goto err1;
+ }
+ INIT_DELAYED_WORK(&bdc->func_wake_notify, bdc_func_wake_timer);
+ /* Enable Interrupts */
+ temp = bdc_readl(bdc->regs, BDC_BDCSC);
+ temp |= BDC_GIE;
+ bdc_writel(bdc->regs, BDC_BDCSC, temp);
+ return 0;
+err1:
+ usb_del_gadget_udc(&bdc->gadget);
+err0:
+ bdc_free_ep(bdc);
+
+ return ret;
+}
+
+void bdc_udc_exit(struct bdc *bdc)
+{
+ dev_dbg(bdc->dev, "%s()\n", __func__);
+ bdc_ep_disable(bdc->bdc_ep_array[1]);
+ usb_del_gadget_udc(&bdc->gadget);
+ bdc_free_ep(bdc);
+}
projects / linux-beck.git / commitdiff