diff options
Diffstat (limited to 'drivers/firewire/fw-card.c')
-rw-r--r-- | drivers/firewire/fw-card.c | 567 |
1 files changed, 0 insertions, 567 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c deleted file mode 100644 index ba6cd70b851..00000000000 --- a/drivers/firewire/fw-card.c +++ /dev/null @@ -1,567 +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/bug.h> -#include <linux/completion.h> -#include <linux/crc-itu-t.h> -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/firewire.h> -#include <linux/firewire-constants.h> -#include <linux/jiffies.h> -#include <linux/kernel.h> -#include <linux/kref.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/spinlock.h> -#include <linux/timer.h> -#include <linux/workqueue.h> - -#include <asm/atomic.h> -#include <asm/byteorder.h> - -#include "core.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); |