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author | Kristian Høgsberg <krh@redhat.com> | 2006-12-19 19:58:27 -0500 |
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committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-03-09 22:02:33 +0100 |
commit | 3038e353cfaf548eb94f02b172b9dbe412abd24c (patch) | |
tree | 70e50c20e117e2dacb7cd810d00fe595e60d26ce /drivers/firewire/fw-card.c | |
parent | 08e15e81a40e3241ce93b4a43886f3abda184aa6 (diff) | |
download | linux-3038e353cfaf548eb94f02b172b9dbe412abd24c.tar.bz2 |
firewire: Add core firewire stack.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/fw-card.c')
-rw-r--r-- | drivers/firewire/fw-card.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c new file mode 100644 index 000000000000..d8abd70ce843 --- /dev/null +++ b/drivers/firewire/fw-card.c @@ -0,0 +1,384 @@ +/* -*- c-basic-offset: 8 -*- + * + * fw-card.c - card level functions + * + * Copyright (C) 2005-2006 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/module.h> +#include <linux/errno.h> +#include <linux/device.h> +#include "fw-transaction.h" +#include "fw-topology.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. */ +static u16 +crc16_itu_t(const u32 *buffer, size_t length) +{ + 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; + } + + return crc; +} + +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 mathces + * 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_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 */ + config_rom[i++] = 0x03d00d1e; /* vendor id */ + j = i + descriptor_count; + + /* Generate root directory entries for descriptors. */ + list_for_each_entry (desc, &descriptor_list, link) { + 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 = (config_rom[i] >> 16) & 0xff; + config_rom[i] |= crc16_itu_t(&config_rom[i + 1], length); + } + + *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 -1; + + down_write(&fw_bus_type.subsys.rwsem); + + list_add_tail (&desc->link, &descriptor_list); + descriptor_count++; + update_config_roms(); + + up_write(&fw_bus_type.subsys.rwsem); + + return 0; +} +EXPORT_SYMBOL(fw_core_add_descriptor); + +void +fw_core_remove_descriptor (struct fw_descriptor *desc) +{ + down_write(&fw_bus_type.subsys.rwsem); + + list_del(&desc->link); + descriptor_count--; + update_config_roms(); + + up_write(&fw_bus_type.subsys.rwsem); +} +EXPORT_SYMBOL(fw_core_remove_descriptor); + +static void +release_card(struct device *device) +{ + struct fw_card *card = + container_of(device, struct fw_card, card_device); + + kfree(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, struct fw_card_driver *driver, + struct device *device) +{ + static int index; + + card->index = index++; + card->driver = driver; + card->device = device; + card->current_tlabel = 0; + card->tlabel_mask = 0; + card->color = 0; + + 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; + + card->card_device.bus = &fw_bus_type; + card->card_device.release = release_card; + card->card_device.parent = card->device; + snprintf(card->card_device.bus_id, sizeof card->card_device.bus_id, + "fwcard%d", card->index); + + device_initialize(&card->card_device); +} +EXPORT_SYMBOL(fw_card_initialize); + +int +fw_card_add(struct fw_card *card, + u32 max_receive, u32 link_speed, u64 guid) +{ + int retval; + u32 *config_rom; + size_t length; + + card->max_receive = max_receive; + 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; + + retval = device_add(&card->card_device); + if (retval < 0) { + fw_error("Failed to register card device."); + return retval; + } + + /* 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); + list_add_tail(&card->link, &card_list); + up_write(&fw_bus_type.subsys.rwsem); + + 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 + * 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_enable_phys_dma(struct fw_card *card, + int node_id, int generation) +{ + return -ENODEV; +} + +static struct fw_card_driver dummy_driver = { + .name = "dummy", + .enable = dummy_enable, + .update_phy_reg = dummy_update_phy_reg, + .set_config_rom = dummy_set_config_rom, + .send_request = dummy_send_request, + .send_response = dummy_send_response, + .enable_phys_dma = dummy_enable_phys_dma +}; + +void +fw_core_remove_card(struct fw_card *card) +{ + card->driver->update_phy_reg(card, 4, 0x80 | 0x40, 0); + fw_core_initiate_bus_reset(card, 1); + + down_write(&fw_bus_type.subsys.rwsem); + list_del(&card->link); + up_write(&fw_bus_type.subsys.rwsem); + + /* Set up the dummy driver. */ + card->driver = &dummy_driver; + + fw_flush_transactions(card); + + fw_destroy_nodes(card); + + /* This also drops the subsystem reference. */ + device_unregister(&card->card_device); +} +EXPORT_SYMBOL(fw_core_remove_card); + +struct fw_card * +fw_card_get(struct fw_card *card) +{ + get_device(&card->card_device); + + return card; +} +EXPORT_SYMBOL(fw_card_get); + +/* 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. */ +void +fw_card_put(struct fw_card *card) +{ + put_device(&card->card_device); +} +EXPORT_SYMBOL(fw_card_put); + +int +fw_core_initiate_bus_reset(struct fw_card *card, int short_reset) +{ + u32 address; + + if (short_reset) + address = 5; + else + address = 1; + + return card->driver->update_phy_reg(card, address, 0, 0x40); +} +EXPORT_SYMBOL(fw_core_initiate_bus_reset); |