diff options
Diffstat (limited to 'drivers/ieee1394/ieee1394_transactions.c')
| -rw-r--r-- | drivers/ieee1394/ieee1394_transactions.c | 595 |
1 files changed, 0 insertions, 595 deletions
diff --git a/drivers/ieee1394/ieee1394_transactions.c b/drivers/ieee1394/ieee1394_transactions.c deleted file mode 100644 index 675b313..0000000 --- a/drivers/ieee1394/ieee1394_transactions.c +++ /dev/null @@ -1,595 +0,0 @@ -/* - * 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; -} |
