summaryrefslogtreecommitdiff
path: root/drivers/firewire/fw-card.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/firewire/fw-card.c')
-rw-r--r--drivers/firewire/fw-card.c558
1 files changed, 0 insertions, 558 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
deleted file mode 100644
index 8b8c8c22f0fc..000000000000
--- a/drivers/firewire/fw-card.c
+++ /dev/null
@@ -1,558 +0,0 @@
-/*
- * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <linux/completion.h>
-#include <linux/crc-itu-t.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/kref.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-
-#include "fw-transaction.h"
-#include "fw-topology.h"
-#include "fw-device.h"
-
-int fw_compute_block_crc(u32 *block)
-{
- __be32 be32_block[256];
- int i, length;
-
- length = (*block >> 16) & 0xff;
- for (i = 0; i < length; i++)
- be32_block[i] = cpu_to_be32(block[i + 1]);
- *block |= crc_itu_t(0, (u8 *) be32_block, length * 4);
-
- return length;
-}
-
-static DEFINE_MUTEX(card_mutex);
-static LIST_HEAD(card_list);
-
-static LIST_HEAD(descriptor_list);
-static int descriptor_count;
-
-#define BIB_CRC(v) ((v) << 0)
-#define BIB_CRC_LENGTH(v) ((v) << 16)
-#define BIB_INFO_LENGTH(v) ((v) << 24)
-
-#define BIB_LINK_SPEED(v) ((v) << 0)
-#define BIB_GENERATION(v) ((v) << 4)
-#define BIB_MAX_ROM(v) ((v) << 8)
-#define BIB_MAX_RECEIVE(v) ((v) << 12)
-#define BIB_CYC_CLK_ACC(v) ((v) << 16)
-#define BIB_PMC ((1) << 27)
-#define BIB_BMC ((1) << 28)
-#define BIB_ISC ((1) << 29)
-#define BIB_CMC ((1) << 30)
-#define BIB_IMC ((1) << 31)
-
-static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length)
-{
- struct fw_descriptor *desc;
- static u32 config_rom[256];
- int i, j, length;
-
- /*
- * Initialize contents of config rom buffer. On the OHCI
- * controller, block reads to the config rom accesses the host
- * memory, but quadlet read access the hardware bus info block
- * registers. That's just crack, but it means we should make
- * sure the contents of bus info block in host memory matches
- * the version stored in the OHCI registers.
- */
-
- memset(config_rom, 0, sizeof(config_rom));
- config_rom[0] = BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0);
- config_rom[1] = 0x31333934;
-
- config_rom[2] =
- BIB_LINK_SPEED(card->link_speed) |
- BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
- BIB_MAX_ROM(2) |
- BIB_MAX_RECEIVE(card->max_receive) |
- BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC;
- config_rom[3] = card->guid >> 32;
- config_rom[4] = card->guid;
-
- /* Generate root directory. */
- i = 5;
- config_rom[i++] = 0;
- config_rom[i++] = 0x0c0083c0; /* node capabilities */
- j = i + descriptor_count;
-
- /* Generate root directory entries for descriptors. */
- list_for_each_entry (desc, &descriptor_list, link) {
- if (desc->immediate > 0)
- config_rom[i++] = desc->immediate;
- config_rom[i] = desc->key | (j - i);
- i++;
- j += desc->length;
- }
-
- /* Update root directory length. */
- config_rom[5] = (i - 5 - 1) << 16;
-
- /* End of root directory, now copy in descriptors. */
- list_for_each_entry (desc, &descriptor_list, link) {
- memcpy(&config_rom[i], desc->data, desc->length * 4);
- i += desc->length;
- }
-
- /* Calculate CRCs for all blocks in the config rom. This
- * assumes that CRC length and info length are identical for
- * the bus info block, which is always the case for this
- * implementation. */
- for (i = 0; i < j; i += length + 1)
- length = fw_compute_block_crc(config_rom + i);
-
- *config_rom_length = j;
-
- return config_rom;
-}
-
-static void update_config_roms(void)
-{
- struct fw_card *card;
- u32 *config_rom;
- size_t length;
-
- list_for_each_entry (card, &card_list, link) {
- config_rom = generate_config_rom(card, &length);
- card->driver->set_config_rom(card, config_rom, length);
- }
-}
-
-int fw_core_add_descriptor(struct fw_descriptor *desc)
-{
- size_t i;
-
- /*
- * Check descriptor is valid; the length of all blocks in the
- * descriptor has to add up to exactly the length of the
- * block.
- */
- i = 0;
- while (i < desc->length)
- i += (desc->data[i] >> 16) + 1;
-
- if (i != desc->length)
- return -EINVAL;
-
- mutex_lock(&card_mutex);
-
- list_add_tail(&desc->link, &descriptor_list);
- descriptor_count++;
- if (desc->immediate > 0)
- descriptor_count++;
- update_config_roms();
-
- mutex_unlock(&card_mutex);
-
- return 0;
-}
-
-void fw_core_remove_descriptor(struct fw_descriptor *desc)
-{
- mutex_lock(&card_mutex);
-
- list_del(&desc->link);
- descriptor_count--;
- if (desc->immediate > 0)
- descriptor_count--;
- update_config_roms();
-
- mutex_unlock(&card_mutex);
-}
-
-static int set_broadcast_channel(struct device *dev, void *data)
-{
- fw_device_set_broadcast_channel(fw_device(dev), (long)data);
- return 0;
-}
-
-static void allocate_broadcast_channel(struct fw_card *card, int generation)
-{
- int channel, bandwidth = 0;
-
- fw_iso_resource_manage(card, generation, 1ULL << 31,
- &channel, &bandwidth, true);
- if (channel == 31) {
- card->broadcast_channel_allocated = true;
- device_for_each_child(card->device, (void *)(long)generation,
- set_broadcast_channel);
- }
-}
-
-static const char gap_count_table[] = {
- 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
-};
-
-void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
-{
- int scheduled;
-
- fw_card_get(card);
- scheduled = schedule_delayed_work(&card->work, delay);
- if (!scheduled)
- fw_card_put(card);
-}
-
-static void fw_card_bm_work(struct work_struct *work)
-{
- struct fw_card *card = container_of(work, struct fw_card, work.work);
- struct fw_device *root_device;
- struct fw_node *root_node;
- unsigned long flags;
- int root_id, new_root_id, irm_id, local_id;
- int gap_count, generation, grace, rcode;
- bool do_reset = false;
- bool root_device_is_running;
- bool root_device_is_cmc;
- __be32 lock_data[2];
-
- spin_lock_irqsave(&card->lock, flags);
-
- if (card->local_node == NULL) {
- spin_unlock_irqrestore(&card->lock, flags);
- goto out_put_card;
- }
-
- generation = card->generation;
- root_node = card->root_node;
- fw_node_get(root_node);
- root_device = root_node->data;
- root_device_is_running = root_device &&
- atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
- root_device_is_cmc = root_device && root_device->cmc;
- root_id = root_node->node_id;
- irm_id = card->irm_node->node_id;
- local_id = card->local_node->node_id;
-
- grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
-
- if (is_next_generation(generation, card->bm_generation) ||
- (card->bm_generation != generation && grace)) {
- /*
- * This first step is to figure out who is IRM and
- * then try to become bus manager. If the IRM is not
- * well defined (e.g. does not have an active link
- * layer or does not responds to our lock request, we
- * will have to do a little vigilante bus management.
- * In that case, we do a goto into the gap count logic
- * so that when we do the reset, we still optimize the
- * gap count. That could well save a reset in the
- * next generation.
- */
-
- if (!card->irm_node->link_on) {
- new_root_id = local_id;
- fw_notify("IRM has link off, making local node (%02x) root.\n",
- new_root_id);
- goto pick_me;
- }
-
- lock_data[0] = cpu_to_be32(0x3f);
- lock_data[1] = cpu_to_be32(local_id);
-
- spin_unlock_irqrestore(&card->lock, flags);
-
- rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
- irm_id, generation, SCODE_100,
- CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
- lock_data, sizeof(lock_data));
-
- if (rcode == RCODE_GENERATION)
- /* Another bus reset, BM work has been rescheduled. */
- goto out;
-
- if (rcode == RCODE_COMPLETE &&
- lock_data[0] != cpu_to_be32(0x3f)) {
-
- /* Somebody else is BM. Only act as IRM. */
- if (local_id == irm_id)
- allocate_broadcast_channel(card, generation);
-
- goto out;
- }
-
- spin_lock_irqsave(&card->lock, flags);
-
- if (rcode != RCODE_COMPLETE) {
- /*
- * The lock request failed, maybe the IRM
- * isn't really IRM capable after all. Let's
- * do a bus reset and pick the local node as
- * root, and thus, IRM.
- */
- new_root_id = local_id;
- fw_notify("BM lock failed, making local node (%02x) root.\n",
- new_root_id);
- goto pick_me;
- }
- } else if (card->bm_generation != generation) {
- /*
- * We weren't BM in the last generation, and the last
- * bus reset is less than 125ms ago. Reschedule this job.
- */
- spin_unlock_irqrestore(&card->lock, flags);
- fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
- goto out;
- }
-
- /*
- * We're bus manager for this generation, so next step is to
- * make sure we have an active cycle master and do gap count
- * optimization.
- */
- card->bm_generation = generation;
-
- if (root_device == NULL) {
- /*
- * Either link_on is false, or we failed to read the
- * config rom. In either case, pick another root.
- */
- new_root_id = local_id;
- } else if (!root_device_is_running) {
- /*
- * If we haven't probed this device yet, bail out now
- * and let's try again once that's done.
- */
- spin_unlock_irqrestore(&card->lock, flags);
- goto out;
- } else if (root_device_is_cmc) {
- /*
- * FIXME: I suppose we should set the cmstr bit in the
- * STATE_CLEAR register of this node, as described in
- * 1394-1995, 8.4.2.6. Also, send out a force root
- * packet for this node.
- */
- new_root_id = root_id;
- } else {
- /*
- * Current root has an active link layer and we
- * successfully read the config rom, but it's not
- * cycle master capable.
- */
- new_root_id = local_id;
- }
-
- pick_me:
- /*
- * Pick a gap count from 1394a table E-1. The table doesn't cover
- * the typically much larger 1394b beta repeater delays though.
- */
- if (!card->beta_repeaters_present &&
- root_node->max_hops < ARRAY_SIZE(gap_count_table))
- gap_count = gap_count_table[root_node->max_hops];
- else
- gap_count = 63;
-
- /*
- * Finally, figure out if we should do a reset or not. If we have
- * done less than 5 resets with the same physical topology and we
- * have either a new root or a new gap count setting, let's do it.
- */
-
- if (card->bm_retries++ < 5 &&
- (card->gap_count != gap_count || new_root_id != root_id))
- do_reset = true;
-
- spin_unlock_irqrestore(&card->lock, flags);
-
- if (do_reset) {
- fw_notify("phy config: card %d, new root=%x, gap_count=%d\n",
- card->index, new_root_id, gap_count);
- fw_send_phy_config(card, new_root_id, generation, gap_count);
- fw_core_initiate_bus_reset(card, 1);
- /* Will allocate broadcast channel after the reset. */
- } else {
- if (local_id == irm_id)
- allocate_broadcast_channel(card, generation);
- }
-
- out:
- fw_node_put(root_node);
- out_put_card:
- fw_card_put(card);
-}
-
-static void flush_timer_callback(unsigned long data)
-{
- struct fw_card *card = (struct fw_card *)data;
-
- fw_flush_transactions(card);
-}
-
-void fw_card_initialize(struct fw_card *card,
- const struct fw_card_driver *driver,
- struct device *device)
-{
- static atomic_t index = ATOMIC_INIT(-1);
-
- card->index = atomic_inc_return(&index);
- card->driver = driver;
- card->device = device;
- card->current_tlabel = 0;
- card->tlabel_mask = 0;
- card->color = 0;
- card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
-
- kref_init(&card->kref);
- init_completion(&card->done);
- INIT_LIST_HEAD(&card->transaction_list);
- spin_lock_init(&card->lock);
- setup_timer(&card->flush_timer,
- flush_timer_callback, (unsigned long)card);
-
- card->local_node = NULL;
-
- INIT_DELAYED_WORK(&card->work, fw_card_bm_work);
-}
-EXPORT_SYMBOL(fw_card_initialize);
-
-int fw_card_add(struct fw_card *card,
- u32 max_receive, u32 link_speed, u64 guid)
-{
- u32 *config_rom;
- size_t length;
- int ret;
-
- card->max_receive = max_receive;
- card->link_speed = link_speed;
- card->guid = guid;
-
- mutex_lock(&card_mutex);
- config_rom = generate_config_rom(card, &length);
- list_add_tail(&card->link, &card_list);
- mutex_unlock(&card_mutex);
-
- ret = card->driver->enable(card, config_rom, length);
- if (ret < 0) {
- mutex_lock(&card_mutex);
- list_del(&card->link);
- mutex_unlock(&card_mutex);
- }
-
- return ret;
-}
-EXPORT_SYMBOL(fw_card_add);
-
-
-/*
- * The next few functions implements a dummy driver that use once a
- * card driver shuts down an fw_card. This allows the driver to
- * cleanly unload, as all IO to the card will be handled by the dummy
- * driver instead of calling into the (possibly) unloaded module. The
- * dummy driver just fails all IO.
- */
-
-static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length)
-{
- BUG();
- return -1;
-}
-
-static int dummy_update_phy_reg(struct fw_card *card, int address,
- int clear_bits, int set_bits)
-{
- return -ENODEV;
-}
-
-static int dummy_set_config_rom(struct fw_card *card,
- u32 *config_rom, size_t length)
-{
- /*
- * We take the card out of card_list before setting the dummy
- * driver, so this should never get called.
- */
- BUG();
- return -1;
-}
-
-static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
-{
- packet->callback(packet, card, -ENODEV);
-}
-
-static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
-{
- packet->callback(packet, card, -ENODEV);
-}
-
-static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
-{
- return -ENOENT;
-}
-
-static int dummy_enable_phys_dma(struct fw_card *card,
- int node_id, int generation)
-{
- return -ENODEV;
-}
-
-static struct fw_card_driver dummy_driver = {
- .enable = dummy_enable,
- .update_phy_reg = dummy_update_phy_reg,
- .set_config_rom = dummy_set_config_rom,
- .send_request = dummy_send_request,
- .cancel_packet = dummy_cancel_packet,
- .send_response = dummy_send_response,
- .enable_phys_dma = dummy_enable_phys_dma,
-};
-
-void fw_card_release(struct kref *kref)
-{
- struct fw_card *card = container_of(kref, struct fw_card, kref);
-
- complete(&card->done);
-}
-
-void fw_core_remove_card(struct fw_card *card)
-{
- card->driver->update_phy_reg(card, 4,
- PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
- fw_core_initiate_bus_reset(card, 1);
-
- mutex_lock(&card_mutex);
- list_del_init(&card->link);
- mutex_unlock(&card_mutex);
-
- /* Set up the dummy driver. */
- card->driver = &dummy_driver;
-
- fw_destroy_nodes(card);
-
- /* Wait for all users, especially device workqueue jobs, to finish. */
- fw_card_put(card);
- wait_for_completion(&card->done);
-
- WARN_ON(!list_empty(&card->transaction_list));
- del_timer_sync(&card->flush_timer);
-}
-EXPORT_SYMBOL(fw_core_remove_card);
-
-int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset)
-{
- int reg = short_reset ? 5 : 1;
- int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
-
- return card->driver->update_phy_reg(card, reg, 0, bit);
-}
-EXPORT_SYMBOL(fw_core_initiate_bus_reset);
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-31 11:46:14 +0000