X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=drivers%2Ffirewire%2Ffw-card.c;h=9eb1edacd825d3d4c4e5d345bfb9c869bef98aaa;hb=dda034bcb51a0a28318046d74d664e0fc5f7d1d4;hp=d929eb6fef6a3eea4b8bf8c7f38bae946df527a5;hpb=473d28c730e2de888c24b226cfe4183868eacde2;p=linux-2.6-omap-h63xx.git diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c index d929eb6fef6..9eb1edacd82 100644 --- a/drivers/firewire/fw-card.c +++ b/drivers/firewire/fw-card.c @@ -1,8 +1,5 @@ -/* -*- c-basic-offset: 8 -*- - * - * fw-card.c - card level functions - * - * Copyright (C) 2005-2006 Kristian Hoegsberg +/* + * Copyright (C) 2005-2007 Kristian Hoegsberg * * 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 @@ -22,77 +19,72 @@ #include #include #include +#include +#include #include "fw-transaction.h" #include "fw-topology.h" #include "fw-device.h" -/* The lib/crc16.c implementation uses the standard (0x8005) - * polynomial, but we need the ITU-T (or CCITT) polynomial (0x1021). - * The implementation below works on an array of host-endian u32 - * words, assuming they'll be transmited msb first. */ -u16 -crc16_itu_t(const u32 *buffer, size_t length) +int fw_compute_block_crc(u32 *block) { - int shift, i; - u32 data; - u16 sum, crc = 0; - - for (i = 0; i < length; i++) { - data = *buffer++; - for (shift = 28; shift >= 0; shift -= 4 ) { - sum = ((crc >> 12) ^ (data >> shift)) & 0xf; - crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum); - } - crc &= 0xffff; - } + __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 crc; + 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) +#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) +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 + /* + * 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 mathces - * the version stored in the OHCI registers. */ + * 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); + 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; + 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; @@ -124,10 +116,8 @@ generate_config_rom (struct fw_card *card, size_t *config_rom_length) * 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 = (config_rom[i] >> 16) & 0xff; - config_rom[i] |= crc16_itu_t(&config_rom[i + 1], length); - } + for (i = 0; i < j; i += length + 1) + length = fw_compute_block_crc(config_rom + i); *config_rom_length = j; @@ -135,7 +125,7 @@ generate_config_rom (struct fw_card *card, size_t *config_rom_length) } static void -update_config_roms (void) +update_config_roms(void) { struct fw_card *card; u32 *config_rom; @@ -148,38 +138,40 @@ update_config_roms (void) } int -fw_core_add_descriptor (struct fw_descriptor *desc) +fw_core_add_descriptor(struct fw_descriptor *desc) { size_t i; - /* Check descriptor is valid; the length of all blocks in the + /* + * Check descriptor is valid; the length of all blocks in the * descriptor has to add up to exactly the length of the - * block. */ + * block. + */ i = 0; while (i < desc->length) i += (desc->data[i] >> 16) + 1; if (i != desc->length) - return -1; + return -EINVAL; - down_write(&fw_bus_type.subsys.rwsem); + mutex_lock(&card_mutex); - list_add_tail (&desc->link, &descriptor_list); + list_add_tail(&desc->link, &descriptor_list); descriptor_count++; if (desc->immediate > 0) descriptor_count++; update_config_roms(); - up_write(&fw_bus_type.subsys.rwsem); + mutex_unlock(&card_mutex); return 0; } EXPORT_SYMBOL(fw_core_add_descriptor); void -fw_core_remove_descriptor (struct fw_descriptor *desc) +fw_core_remove_descriptor(struct fw_descriptor *desc) { - down_write(&fw_bus_type.subsys.rwsem); + mutex_lock(&card_mutex); list_del(&desc->link); descriptor_count--; @@ -187,7 +179,7 @@ fw_core_remove_descriptor (struct fw_descriptor *desc) descriptor_count--; update_config_roms(); - up_write(&fw_bus_type.subsys.rwsem); + mutex_unlock(&card_mutex); } EXPORT_SYMBOL(fw_core_remove_descriptor); @@ -237,7 +229,8 @@ fw_card_bm_work(struct work_struct *work) if (card->bm_generation + 1 == generation || (card->bm_generation != generation && grace)) { - /* This first step is to figure out who is IRM and + /* + * 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 @@ -245,7 +238,8 @@ fw_card_bm_work(struct work_struct *work) * 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. */ + * next generation. + */ irm_id = card->irm_node->node_id; if (!card->irm_node->link_on) { @@ -264,13 +258,15 @@ fw_card_bm_work(struct work_struct *work) fw_send_request(card, &bmd.t, TCODE_LOCK_COMPARE_SWAP, irm_id, generation, SCODE_100, CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID, - &bmd.lock, sizeof bmd.lock, + &bmd.lock, sizeof(bmd.lock), complete_bm_lock, &bmd); wait_for_completion(&bmd.done); if (bmd.rcode == RCODE_GENERATION) { - /* Another bus reset happened. Just return, - * the BM work has been rescheduled. */ + /* + * Another bus reset happened. Just return, + * the BM work has been rescheduled. + */ return; } @@ -280,48 +276,62 @@ fw_card_bm_work(struct work_struct *work) spin_lock_irqsave(&card->lock, flags); if (bmd.rcode != RCODE_COMPLETE) { - /* The lock request failed, maybe the IRM + /* + * 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. */ + * root, and thus, IRM. + */ new_root_id = card->local_node->node_id; fw_notify("BM lock failed, making local node (%02x) root.\n", new_root_id); goto pick_me; } } else if (card->bm_generation != generation) { - /* OK, we weren't BM in the last generation, and it's + /* + * OK, we weren't BM in the last generation, and it's * less than 100ms since last bus reset. Reschedule - * this task 100ms from now. */ + * this task 100ms from now. + */ spin_unlock_irqrestore(&card->lock, flags); schedule_delayed_work(&card->work, DIV_ROUND_UP(HZ, 10)); return; } - /* We're bus manager for this generation, so next step is to + /* + * 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. */ + * optimization. + */ card->bm_generation = generation; if (root == NULL) { - /* Either link_on is false, or we failed to read the - * config rom. In either case, pick another root. */ + /* + * Either link_on is false, or we failed to read the + * config rom. In either case, pick another root. + */ new_root_id = card->local_node->node_id; } else if (atomic_read(&root->state) != FW_DEVICE_RUNNING) { - /* If we haven't probed this device yet, bail out now - * and let's try again once that's done. */ + /* + * 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); return; - } else if (root->config_rom[2] & bib_cmc) { - /* FIXME: I suppose we should set the cmstr bit in the + } else if (root->config_rom[2] & BIB_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. */ + * packet for this node. + */ new_root_id = root_id; } else { - /* Current root has an active link layer and we + /* + * Current root has an active link layer and we * successfully read the config rom, but it's not - * cycle master capable. */ + * cycle master capable. + */ new_root_id = card->local_node->node_id; } @@ -333,9 +343,11 @@ fw_card_bm_work(struct work_struct *work) else gap_count = 63; - /* Finally, figure out if we should do a reset or not. If we've + /* + * Finally, figure out if we should do a reset or not. If we've * done less that 5 resets with the same physical topology and we - * have either a new root or a new gap count setting, let's do it. */ + * 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)) @@ -395,30 +407,29 @@ fw_card_add(struct fw_card *card, card->link_speed = link_speed; card->guid = guid; - /* FIXME: add #define's for phy registers. */ - /* Activate link_on bit and contender bit in our self ID packets.*/ - if (card->driver->update_phy_reg(card, 4, 0, 0x80 | 0x40) < 0) - return -EIO; - - /* The subsystem grabs a reference when the card is added and - * drops it when the driver calls fw_core_remove_card. */ + /* + * The subsystem grabs a reference when the card is added and + * drops it when the driver calls fw_core_remove_card. + */ fw_card_get(card); - down_write(&fw_bus_type.subsys.rwsem); - config_rom = generate_config_rom (card, &length); + mutex_lock(&card_mutex); + config_rom = generate_config_rom(card, &length); list_add_tail(&card->link, &card_list); - up_write(&fw_bus_type.subsys.rwsem); + mutex_unlock(&card_mutex); return card->driver->enable(card, config_rom, length); } EXPORT_SYMBOL(fw_card_add); -/* The next few functions implements a dummy driver that use once a +/* + * 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. */ + * dummy driver just fails all IO. + */ static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length) @@ -438,8 +449,10 @@ 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. */ + /* + * We take the card out of card_list before setting the dummy + * driver, so this should never get called. + */ BUG(); return -1; } @@ -483,12 +496,13 @@ static struct fw_card_driver dummy_driver = { void fw_core_remove_card(struct fw_card *card) { - card->driver->update_phy_reg(card, 4, 0x80 | 0x40, 0); + card->driver->update_phy_reg(card, 4, + PHY_LINK_ACTIVE | PHY_CONTENDER, 0); fw_core_initiate_bus_reset(card, 1); - down_write(&fw_bus_type.subsys.rwsem); + mutex_lock(&card_mutex); list_del(&card->link); - up_write(&fw_bus_type.subsys.rwsem); + mutex_unlock(&card_mutex); /* Set up the dummy driver. */ card->driver = &dummy_driver; @@ -518,9 +532,11 @@ release_card(struct kref *kref) kfree(card); } -/* An assumption for fw_card_put() is that the card driver allocates +/* + * An assumption for fw_card_put() is that the card driver allocates * the fw_card struct with kalloc and that it has been shut down - * before the last ref is dropped. */ + * before the last ref is dropped. + */ void fw_card_put(struct fw_card *card) { @@ -531,6 +547,9 @@ EXPORT_SYMBOL(fw_card_put); int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset) { - return card->driver->update_phy_reg(card, short_reset ? 5 : 1, 0, 0x40); + 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);