+++ /dev/null
-/*
- * IEEE 1394 for Linux
- *
- * Transaction support.
- *
- * Copyright (C) 1999 Andreas E. Bombe
- *
- * This code is licensed under the GPL. See the file COPYING in the root
- * directory of the kernel sources for details.
- */
-
-#include <linux/bitops.h>
-#include <linux/compiler.h>
-#include <linux/hardirq.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/sched.h> /* because linux/wait.h is broken if CONFIG_SMP=n */
-#include <linux/wait.h>
-
-#include <asm/bug.h>
-#include <asm/errno.h>
-#include <asm/system.h>
-
-#include "ieee1394.h"
-#include "ieee1394_types.h"
-#include "hosts.h"
-#include "ieee1394_core.h"
-#include "ieee1394_transactions.h"
-
-#define PREP_ASYNC_HEAD_ADDRESS(tc) \
- packet->tcode = tc; \
- packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \
- | (1 << 8) | (tc << 4); \
- packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \
- packet->header[2] = addr & 0xffffffff
-
-#ifndef HPSB_DEBUG_TLABELS
-static
-#endif
-DEFINE_SPINLOCK(hpsb_tlabel_lock);
-
-static DECLARE_WAIT_QUEUE_HEAD(tlabel_wq);
-
-static void fill_async_readquad(struct hpsb_packet *packet, u64 addr)
-{
- PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ);
- packet->header_size = 12;
- packet->data_size = 0;
- packet->expect_response = 1;
-}
-
-static void fill_async_readblock(struct hpsb_packet *packet, u64 addr,
- int length)
-{
- PREP_ASYNC_HEAD_ADDRESS(TCODE_READB);
- packet->header[3] = length << 16;
- packet->header_size = 16;
- packet->data_size = 0;
- packet->expect_response = 1;
-}
-
-static void fill_async_writequad(struct hpsb_packet *packet, u64 addr,
- quadlet_t data)
-{
- PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ);
- packet->header[3] = data;
- packet->header_size = 16;
- packet->data_size = 0;
- packet->expect_response = 1;
-}
-
-static void fill_async_writeblock(struct hpsb_packet *packet, u64 addr,
- int length)
-{
- PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB);
- packet->header[3] = length << 16;
- packet->header_size = 16;
- packet->expect_response = 1;
- packet->data_size = length + (length % 4 ? 4 - (length % 4) : 0);
-}
-
-static void fill_async_lock(struct hpsb_packet *packet, u64 addr, int extcode,
- int length)
-{
- PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST);
- packet->header[3] = (length << 16) | extcode;
- packet->header_size = 16;
- packet->data_size = length;
- packet->expect_response = 1;
-}
-
-static void fill_phy_packet(struct hpsb_packet *packet, quadlet_t data)
-{
- packet->header[0] = data;
- packet->header[1] = ~data;
- packet->header_size = 8;
- packet->data_size = 0;
- packet->expect_response = 0;
- packet->type = hpsb_raw; /* No CRC added */
- packet->speed_code = IEEE1394_SPEED_100; /* Force speed to be 100Mbps */
-}
-
-static void fill_async_stream_packet(struct hpsb_packet *packet, int length,
- int channel, int tag, int sync)
-{
- packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
- | (TCODE_STREAM_DATA << 4) | sync;
-
- packet->header_size = 4;
- packet->data_size = length;
- packet->type = hpsb_async;
- packet->tcode = TCODE_ISO_DATA;
-}
-
-/* same as hpsb_get_tlabel, except that it returns immediately */
-static int hpsb_get_tlabel_atomic(struct hpsb_packet *packet)
-{
- unsigned long flags, *tp;
- u8 *next;
- int tlabel, n = NODEID_TO_NODE(packet->node_id);
-
- /* Broadcast transactions are complete once the request has been sent.
- * Use the same transaction label for all broadcast transactions. */
- if (unlikely(n == ALL_NODES)) {
- packet->tlabel = 0;
- return 0;
- }
- tp = packet->host->tl_pool[n].map;
- next = &packet->host->next_tl[n];
-
- spin_lock_irqsave(&hpsb_tlabel_lock, flags);
- tlabel = find_next_zero_bit(tp, 64, *next);
- if (tlabel > 63)
- tlabel = find_first_zero_bit(tp, 64);
- if (tlabel > 63) {
- spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
- return -EAGAIN;
- }
- __set_bit(tlabel, tp);
- *next = (tlabel + 1) & 63;
- spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
-
- packet->tlabel = tlabel;
- return 0;
-}
-
-/**
- * hpsb_get_tlabel - allocate a transaction label
- * @packet: the packet whose tlabel and tl_pool we set
- *
- * Every asynchronous transaction on the 1394 bus needs a transaction
- * label to match the response to the request. This label has to be
- * different from any other transaction label in an outstanding request to
- * the same node to make matching possible without ambiguity.
- *
- * There are 64 different tlabels, so an allocated tlabel has to be freed
- * with hpsb_free_tlabel() after the transaction is complete (unless it's
- * reused again for the same target node).
- *
- * Return value: Zero on success, otherwise non-zero. A non-zero return
- * generally means there are no available tlabels. If this is called out
- * of interrupt or atomic context, then it will sleep until can return a
- * tlabel or a signal is received.
- */
-int hpsb_get_tlabel(struct hpsb_packet *packet)
-{
- if (irqs_disabled() || in_atomic())
- return hpsb_get_tlabel_atomic(packet);
-
- /* NB: The macro wait_event_interruptible() is called with a condition
- * argument with side effect. This is only possible because the side
- * effect does not occur until the condition became true, and
- * wait_event_interruptible() won't evaluate the condition again after
- * that. */
- return wait_event_interruptible(tlabel_wq,
- !hpsb_get_tlabel_atomic(packet));
-}
-
-/**
- * hpsb_free_tlabel - free an allocated transaction label
- * @packet: packet whose tlabel and tl_pool needs to be cleared
- *
- * Frees the transaction label allocated with hpsb_get_tlabel(). The
- * tlabel has to be freed after the transaction is complete (i.e. response
- * was received for a split transaction or packet was sent for a unified
- * transaction).
- *
- * A tlabel must not be freed twice.
- */
-void hpsb_free_tlabel(struct hpsb_packet *packet)
-{
- unsigned long flags, *tp;
- int tlabel, n = NODEID_TO_NODE(packet->node_id);
-
- if (unlikely(n == ALL_NODES))
- return;
- tp = packet->host->tl_pool[n].map;
- tlabel = packet->tlabel;
- BUG_ON(tlabel > 63 || tlabel < 0);
-
- spin_lock_irqsave(&hpsb_tlabel_lock, flags);
- BUG_ON(!__test_and_clear_bit(tlabel, tp));
- spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
-
- wake_up_interruptible(&tlabel_wq);
-}
-
-/**
- * hpsb_packet_success - Make sense of the ack and reply codes
- *
- * Make sense of the ack and reply codes and return more convenient error codes:
- * 0 = success. -%EBUSY = node is busy, try again. -%EAGAIN = error which can
- * probably resolved by retry. -%EREMOTEIO = node suffers from an internal
- * error. -%EACCES = this transaction is not allowed on requested address.
- * -%EINVAL = invalid address at node.
- */
-int hpsb_packet_success(struct hpsb_packet *packet)
-{
- switch (packet->ack_code) {
- case ACK_PENDING:
- switch ((packet->header[1] >> 12) & 0xf) {
- case RCODE_COMPLETE:
- return 0;
- case RCODE_CONFLICT_ERROR:
- return -EAGAIN;
- case RCODE_DATA_ERROR:
- return -EREMOTEIO;
- case RCODE_TYPE_ERROR:
- return -EACCES;
- case RCODE_ADDRESS_ERROR:
- return -EINVAL;
- default:
- HPSB_ERR("received reserved rcode %d from node %d",
- (packet->header[1] >> 12) & 0xf,
- packet->node_id);
- return -EAGAIN;
- }
-
- case ACK_BUSY_X:
- case ACK_BUSY_A:
- case ACK_BUSY_B:
- return -EBUSY;
-
- case ACK_TYPE_ERROR:
- return -EACCES;
-
- case ACK_COMPLETE:
- if (packet->tcode == TCODE_WRITEQ
- || packet->tcode == TCODE_WRITEB) {
- return 0;
- } else {
- HPSB_ERR("impossible ack_complete from node %d "
- "(tcode %d)", packet->node_id, packet->tcode);
- return -EAGAIN;
- }
-
- case ACK_DATA_ERROR:
- if (packet->tcode == TCODE_WRITEB
- || packet->tcode == TCODE_LOCK_REQUEST) {
- return -EAGAIN;
- } else {
- HPSB_ERR("impossible ack_data_error from node %d "
- "(tcode %d)", packet->node_id, packet->tcode);
- return -EAGAIN;
- }
-
- case ACK_ADDRESS_ERROR:
- return -EINVAL;
-
- case ACK_TARDY:
- case ACK_CONFLICT_ERROR:
- case ACKX_NONE:
- case ACKX_SEND_ERROR:
- case ACKX_ABORTED:
- case ACKX_TIMEOUT:
- /* error while sending */
- return -EAGAIN;
-
- default:
- HPSB_ERR("got invalid ack %d from node %d (tcode %d)",
- packet->ack_code, packet->node_id, packet->tcode);
- return -EAGAIN;
- }
-}
-
-struct hpsb_packet *hpsb_make_readpacket(struct hpsb_host *host, nodeid_t node,
- u64 addr, size_t length)
-{
- struct hpsb_packet *packet;
-
- if (length == 0)
- return NULL;
-
- packet = hpsb_alloc_packet(length);
- if (!packet)
- return NULL;
-
- packet->host = host;
- packet->node_id = node;
-
- if (hpsb_get_tlabel(packet)) {
- hpsb_free_packet(packet);
- return NULL;
- }
-
- if (length == 4)
- fill_async_readquad(packet, addr);
- else
- fill_async_readblock(packet, addr, length);
-
- return packet;
-}
-
-struct hpsb_packet *hpsb_make_writepacket(struct hpsb_host *host, nodeid_t node,
- u64 addr, quadlet_t * buffer,
- size_t length)
-{
- struct hpsb_packet *packet;
-
- if (length == 0)
- return NULL;
-
- packet = hpsb_alloc_packet(length);
- if (!packet)
- return NULL;
-
- if (length % 4) { /* zero padding bytes */
- packet->data[length >> 2] = 0;
- }
- packet->host = host;
- packet->node_id = node;
-
- if (hpsb_get_tlabel(packet)) {
- hpsb_free_packet(packet);
- return NULL;
- }
-
- if (length == 4) {
- fill_async_writequad(packet, addr, buffer ? *buffer : 0);
- } else {
- fill_async_writeblock(packet, addr, length);
- if (buffer)
- memcpy(packet->data, buffer, length);
- }
-
- return packet;
-}
-
-struct hpsb_packet *hpsb_make_streampacket(struct hpsb_host *host, u8 * buffer,
- int length, int channel, int tag,
- int sync)
-{
- struct hpsb_packet *packet;
-
- if (length == 0)
- return NULL;
-
- packet = hpsb_alloc_packet(length);
- if (!packet)
- return NULL;
-
- if (length % 4) { /* zero padding bytes */
- packet->data[length >> 2] = 0;
- }
- packet->host = host;
-
- /* Because it is too difficult to determine all PHY speeds and link
- * speeds here, we use S100... */
- packet->speed_code = IEEE1394_SPEED_100;
-
- /* ...and prevent hpsb_send_packet() from overriding it. */
- packet->node_id = LOCAL_BUS | ALL_NODES;
-
- if (hpsb_get_tlabel(packet)) {
- hpsb_free_packet(packet);
- return NULL;
- }
-
- fill_async_stream_packet(packet, length, channel, tag, sync);
- if (buffer)
- memcpy(packet->data, buffer, length);
-
- return packet;
-}
-
-struct hpsb_packet *hpsb_make_lockpacket(struct hpsb_host *host, nodeid_t node,
- u64 addr, int extcode,
- quadlet_t * data, quadlet_t arg)
-{
- struct hpsb_packet *p;
- u32 length;
-
- p = hpsb_alloc_packet(8);
- if (!p)
- return NULL;
-
- p->host = host;
- p->node_id = node;
- if (hpsb_get_tlabel(p)) {
- hpsb_free_packet(p);
- return NULL;
- }
-
- switch (extcode) {
- case EXTCODE_FETCH_ADD:
- case EXTCODE_LITTLE_ADD:
- length = 4;
- if (data)
- p->data[0] = *data;
- break;
- default:
- length = 8;
- if (data) {
- p->data[0] = arg;
- p->data[1] = *data;
- }
- break;
- }
- fill_async_lock(p, addr, extcode, length);
-
- return p;
-}
-
-struct hpsb_packet *hpsb_make_lock64packet(struct hpsb_host *host,
- nodeid_t node, u64 addr, int extcode,
- octlet_t * data, octlet_t arg)
-{
- struct hpsb_packet *p;
- u32 length;
-
- p = hpsb_alloc_packet(16);
- if (!p)
- return NULL;
-
- p->host = host;
- p->node_id = node;
- if (hpsb_get_tlabel(p)) {
- hpsb_free_packet(p);
- return NULL;
- }
-
- switch (extcode) {
- case EXTCODE_FETCH_ADD:
- case EXTCODE_LITTLE_ADD:
- length = 8;
- if (data) {
- p->data[0] = *data >> 32;
- p->data[1] = *data & 0xffffffff;
- }
- break;
- default:
- length = 16;
- if (data) {
- p->data[0] = arg >> 32;
- p->data[1] = arg & 0xffffffff;
- p->data[2] = *data >> 32;
- p->data[3] = *data & 0xffffffff;
- }
- break;
- }
- fill_async_lock(p, addr, extcode, length);
-
- return p;
-}
-
-struct hpsb_packet *hpsb_make_phypacket(struct hpsb_host *host, quadlet_t data)
-{
- struct hpsb_packet *p;
-
- p = hpsb_alloc_packet(0);
- if (!p)
- return NULL;
-
- p->host = host;
- fill_phy_packet(p, data);
-
- return p;
-}
-
-/*
- * FIXME - these functions should probably read from / write to user space to
- * avoid in kernel buffers for user space callers
- */
-
-/**
- * hpsb_read - generic read function
- *
- * Recognizes the local node ID and act accordingly. Automatically uses a
- * quadlet read request if @length == 4 and and a block read request otherwise.
- * It does not yet support lengths that are not a multiple of 4.
- *
- * You must explicitly specifiy the @generation for which the node ID is valid,
- * to avoid sending packets to the wrong nodes when we race with a bus reset.
- */
-int hpsb_read(struct hpsb_host *host, nodeid_t node, unsigned int generation,
- u64 addr, quadlet_t * buffer, size_t length)
-{
- struct hpsb_packet *packet;
- int retval = 0;
-
- if (length == 0)
- return -EINVAL;
-
- packet = hpsb_make_readpacket(host, node, addr, length);
-
- if (!packet) {
- return -ENOMEM;
- }
-
- packet->generation = generation;
- retval = hpsb_send_packet_and_wait(packet);
- if (retval < 0)
- goto hpsb_read_fail;
-
- retval = hpsb_packet_success(packet);
-
- if (retval == 0) {
- if (length == 4) {
- *buffer = packet->header[3];
- } else {
- memcpy(buffer, packet->data, length);
- }
- }
-
- hpsb_read_fail:
- hpsb_free_tlabel(packet);
- hpsb_free_packet(packet);
-
- return retval;
-}
-
-/**
- * hpsb_write - generic write function
- *
- * Recognizes the local node ID and act accordingly. Automatically uses a
- * quadlet write request if @length == 4 and and a block write request
- * otherwise. It does not yet support lengths that are not a multiple of 4.
- *
- * You must explicitly specifiy the @generation for which the node ID is valid,
- * to avoid sending packets to the wrong nodes when we race with a bus reset.
- */
-int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation,
- u64 addr, quadlet_t * buffer, size_t length)
-{
- struct hpsb_packet *packet;
- int retval;
-
- if (length == 0)
- return -EINVAL;
-
- packet = hpsb_make_writepacket(host, node, addr, buffer, length);
-
- if (!packet)
- return -ENOMEM;
-
- packet->generation = generation;
- retval = hpsb_send_packet_and_wait(packet);
- if (retval < 0)
- goto hpsb_write_fail;
-
- retval = hpsb_packet_success(packet);
-
- hpsb_write_fail:
- hpsb_free_tlabel(packet);
- hpsb_free_packet(packet);
-
- return retval;
-}
-
-int hpsb_lock(struct hpsb_host *host, nodeid_t node, unsigned int generation,
- u64 addr, int extcode, quadlet_t *data, quadlet_t arg)
-{
- struct hpsb_packet *packet;
- int retval = 0;
-
- packet = hpsb_make_lockpacket(host, node, addr, extcode, data, arg);
- if (!packet)
- return -ENOMEM;
-
- packet->generation = generation;
- retval = hpsb_send_packet_and_wait(packet);
- if (retval < 0)
- goto hpsb_lock_fail;
-
- retval = hpsb_packet_success(packet);
-
- if (retval == 0)
- *data = packet->data[0];
-
-hpsb_lock_fail:
- hpsb_free_tlabel(packet);
- hpsb_free_packet(packet);
-
- return retval;
-}
projects / mv-sheeva.git / blobdiff