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693 lines
19 KiB
693 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2005-2007 Kristian Hoegsberg <[email protected]> |
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*/ |
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|
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#include <linux/bug.h> |
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#include <linux/completion.h> |
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#include <linux/crc-itu-t.h> |
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#include <linux/device.h> |
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#include <linux/errno.h> |
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#include <linux/firewire.h> |
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#include <linux/firewire-constants.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <linux/workqueue.h> |
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#include <linux/atomic.h> |
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#include <asm/byteorder.h> |
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#include "core.h" |
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#define define_fw_printk_level(func, kern_level) \ |
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void func(const struct fw_card *card, const char *fmt, ...) \ |
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{ \ |
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struct va_format vaf; \ |
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va_list args; \ |
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\ |
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va_start(args, fmt); \ |
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vaf.fmt = fmt; \ |
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vaf.va = &args; \ |
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printk(kern_level KBUILD_MODNAME " %s: %pV", \ |
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dev_name(card->device), &vaf); \ |
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va_end(args); \ |
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} |
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define_fw_printk_level(fw_err, KERN_ERR); |
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define_fw_printk_level(fw_notice, KERN_NOTICE); |
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int fw_compute_block_crc(__be32 *block) |
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{ |
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int length; |
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u16 crc; |
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length = (be32_to_cpu(block[0]) >> 16) & 0xff; |
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crc = crc_itu_t(0, (u8 *)&block[1], length * 4); |
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*block |= cpu_to_be32(crc); |
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return length; |
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} |
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static DEFINE_MUTEX(card_mutex); |
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static LIST_HEAD(card_list); |
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static LIST_HEAD(descriptor_list); |
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static int descriptor_count; |
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static __be32 tmp_config_rom[256]; |
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/* ROM header, bus info block, root dir header, capabilities = 7 quadlets */ |
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static size_t config_rom_length = 1 + 4 + 1 + 1; |
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#define BIB_CRC(v) ((v) << 0) |
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#define BIB_CRC_LENGTH(v) ((v) << 16) |
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#define BIB_INFO_LENGTH(v) ((v) << 24) |
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#define BIB_BUS_NAME 0x31333934 /* "1394" */ |
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#define BIB_LINK_SPEED(v) ((v) << 0) |
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#define BIB_GENERATION(v) ((v) << 4) |
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#define BIB_MAX_ROM(v) ((v) << 8) |
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#define BIB_MAX_RECEIVE(v) ((v) << 12) |
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#define BIB_CYC_CLK_ACC(v) ((v) << 16) |
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#define BIB_PMC ((1) << 27) |
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#define BIB_BMC ((1) << 28) |
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#define BIB_ISC ((1) << 29) |
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#define BIB_CMC ((1) << 30) |
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#define BIB_IRMC ((1) << 31) |
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#define NODE_CAPABILITIES 0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */ |
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/* |
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* IEEE-1394 specifies a default SPLIT_TIMEOUT value of 800 cycles (100 ms), |
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* but we have to make it longer because there are many devices whose firmware |
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* is just too slow for that. |
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*/ |
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#define DEFAULT_SPLIT_TIMEOUT (2 * 8000) |
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#define CANON_OUI 0x000085 |
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static void generate_config_rom(struct fw_card *card, __be32 *config_rom) |
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{ |
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struct fw_descriptor *desc; |
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int i, j, k, length; |
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|
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/* |
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* Initialize contents of config rom buffer. On the OHCI |
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* controller, block reads to the config rom accesses the host |
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* memory, but quadlet read access the hardware bus info block |
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* registers. That's just crack, but it means we should make |
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* sure the contents of bus info block in host memory matches |
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* the version stored in the OHCI registers. |
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*/ |
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config_rom[0] = cpu_to_be32( |
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BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0)); |
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config_rom[1] = cpu_to_be32(BIB_BUS_NAME); |
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config_rom[2] = cpu_to_be32( |
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BIB_LINK_SPEED(card->link_speed) | |
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BIB_GENERATION(card->config_rom_generation++ % 14 + 2) | |
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BIB_MAX_ROM(2) | |
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BIB_MAX_RECEIVE(card->max_receive) | |
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BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC); |
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config_rom[3] = cpu_to_be32(card->guid >> 32); |
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config_rom[4] = cpu_to_be32(card->guid); |
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/* Generate root directory. */ |
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config_rom[6] = cpu_to_be32(NODE_CAPABILITIES); |
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i = 7; |
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j = 7 + descriptor_count; |
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/* Generate root directory entries for descriptors. */ |
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list_for_each_entry (desc, &descriptor_list, link) { |
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if (desc->immediate > 0) |
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config_rom[i++] = cpu_to_be32(desc->immediate); |
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config_rom[i] = cpu_to_be32(desc->key | (j - i)); |
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i++; |
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j += desc->length; |
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} |
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/* Update root directory length. */ |
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config_rom[5] = cpu_to_be32((i - 5 - 1) << 16); |
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/* End of root directory, now copy in descriptors. */ |
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list_for_each_entry (desc, &descriptor_list, link) { |
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for (k = 0; k < desc->length; k++) |
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config_rom[i + k] = cpu_to_be32(desc->data[k]); |
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i += desc->length; |
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} |
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/* Calculate CRCs for all blocks in the config rom. This |
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* assumes that CRC length and info length are identical for |
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* the bus info block, which is always the case for this |
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* implementation. */ |
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for (i = 0; i < j; i += length + 1) |
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length = fw_compute_block_crc(config_rom + i); |
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WARN_ON(j != config_rom_length); |
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} |
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static void update_config_roms(void) |
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{ |
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struct fw_card *card; |
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list_for_each_entry (card, &card_list, link) { |
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generate_config_rom(card, tmp_config_rom); |
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card->driver->set_config_rom(card, tmp_config_rom, |
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config_rom_length); |
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} |
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} |
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static size_t required_space(struct fw_descriptor *desc) |
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{ |
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/* descriptor + entry into root dir + optional immediate entry */ |
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return desc->length + 1 + (desc->immediate > 0 ? 1 : 0); |
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} |
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int fw_core_add_descriptor(struct fw_descriptor *desc) |
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{ |
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size_t i; |
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int ret; |
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/* |
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* Check descriptor is valid; the length of all blocks in the |
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* descriptor has to add up to exactly the length of the |
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* block. |
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*/ |
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i = 0; |
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while (i < desc->length) |
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i += (desc->data[i] >> 16) + 1; |
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if (i != desc->length) |
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return -EINVAL; |
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mutex_lock(&card_mutex); |
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if (config_rom_length + required_space(desc) > 256) { |
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ret = -EBUSY; |
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} else { |
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list_add_tail(&desc->link, &descriptor_list); |
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config_rom_length += required_space(desc); |
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descriptor_count++; |
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if (desc->immediate > 0) |
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descriptor_count++; |
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update_config_roms(); |
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ret = 0; |
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} |
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mutex_unlock(&card_mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL(fw_core_add_descriptor); |
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void fw_core_remove_descriptor(struct fw_descriptor *desc) |
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{ |
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mutex_lock(&card_mutex); |
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list_del(&desc->link); |
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config_rom_length -= required_space(desc); |
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descriptor_count--; |
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if (desc->immediate > 0) |
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descriptor_count--; |
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update_config_roms(); |
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mutex_unlock(&card_mutex); |
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} |
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EXPORT_SYMBOL(fw_core_remove_descriptor); |
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static int reset_bus(struct fw_card *card, bool short_reset) |
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{ |
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int reg = short_reset ? 5 : 1; |
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int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET; |
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return card->driver->update_phy_reg(card, reg, 0, bit); |
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} |
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void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset) |
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{ |
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/* We don't try hard to sort out requests of long vs. short resets. */ |
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card->br_short = short_reset; |
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/* Use an arbitrary short delay to combine multiple reset requests. */ |
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fw_card_get(card); |
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if (!queue_delayed_work(fw_workqueue, &card->br_work, |
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delayed ? DIV_ROUND_UP(HZ, 100) : 0)) |
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fw_card_put(card); |
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} |
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EXPORT_SYMBOL(fw_schedule_bus_reset); |
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static void br_work(struct work_struct *work) |
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{ |
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struct fw_card *card = container_of(work, struct fw_card, br_work.work); |
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/* Delay for 2s after last reset per IEEE 1394 clause 8.2.1. */ |
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if (card->reset_jiffies != 0 && |
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time_before64(get_jiffies_64(), card->reset_jiffies + 2 * HZ)) { |
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if (!queue_delayed_work(fw_workqueue, &card->br_work, 2 * HZ)) |
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fw_card_put(card); |
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return; |
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} |
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fw_send_phy_config(card, FW_PHY_CONFIG_NO_NODE_ID, card->generation, |
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FW_PHY_CONFIG_CURRENT_GAP_COUNT); |
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reset_bus(card, card->br_short); |
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fw_card_put(card); |
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} |
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static void allocate_broadcast_channel(struct fw_card *card, int generation) |
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{ |
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int channel, bandwidth = 0; |
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if (!card->broadcast_channel_allocated) { |
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fw_iso_resource_manage(card, generation, 1ULL << 31, |
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&channel, &bandwidth, true); |
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if (channel != 31) { |
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fw_notice(card, "failed to allocate broadcast channel\n"); |
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return; |
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} |
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card->broadcast_channel_allocated = true; |
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} |
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device_for_each_child(card->device, (void *)(long)generation, |
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fw_device_set_broadcast_channel); |
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} |
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static const char gap_count_table[] = { |
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63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40 |
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}; |
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void fw_schedule_bm_work(struct fw_card *card, unsigned long delay) |
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{ |
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fw_card_get(card); |
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if (!schedule_delayed_work(&card->bm_work, delay)) |
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fw_card_put(card); |
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} |
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static void bm_work(struct work_struct *work) |
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{ |
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struct fw_card *card = container_of(work, struct fw_card, bm_work.work); |
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struct fw_device *root_device, *irm_device; |
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struct fw_node *root_node; |
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int root_id, new_root_id, irm_id, bm_id, local_id; |
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int gap_count, generation, grace, rcode; |
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bool do_reset = false; |
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bool root_device_is_running; |
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bool root_device_is_cmc; |
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bool irm_is_1394_1995_only; |
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bool keep_this_irm; |
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__be32 transaction_data[2]; |
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spin_lock_irq(&card->lock); |
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if (card->local_node == NULL) { |
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spin_unlock_irq(&card->lock); |
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goto out_put_card; |
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} |
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generation = card->generation; |
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root_node = card->root_node; |
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fw_node_get(root_node); |
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root_device = root_node->data; |
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root_device_is_running = root_device && |
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atomic_read(&root_device->state) == FW_DEVICE_RUNNING; |
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root_device_is_cmc = root_device && root_device->cmc; |
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irm_device = card->irm_node->data; |
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irm_is_1394_1995_only = irm_device && irm_device->config_rom && |
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(irm_device->config_rom[2] & 0x000000f0) == 0; |
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/* Canon MV5i works unreliably if it is not root node. */ |
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keep_this_irm = irm_device && irm_device->config_rom && |
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irm_device->config_rom[3] >> 8 == CANON_OUI; |
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root_id = root_node->node_id; |
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irm_id = card->irm_node->node_id; |
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local_id = card->local_node->node_id; |
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grace = time_after64(get_jiffies_64(), |
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card->reset_jiffies + DIV_ROUND_UP(HZ, 8)); |
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if ((is_next_generation(generation, card->bm_generation) && |
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!card->bm_abdicate) || |
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(card->bm_generation != generation && grace)) { |
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/* |
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* This first step is to figure out who is IRM and |
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* then try to become bus manager. If the IRM is not |
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* well defined (e.g. does not have an active link |
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* layer or does not responds to our lock request, we |
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* will have to do a little vigilante bus management. |
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* In that case, we do a goto into the gap count logic |
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* so that when we do the reset, we still optimize the |
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* gap count. That could well save a reset in the |
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* next generation. |
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*/ |
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if (!card->irm_node->link_on) { |
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new_root_id = local_id; |
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fw_notice(card, "%s, making local node (%02x) root\n", |
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"IRM has link off", new_root_id); |
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goto pick_me; |
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} |
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if (irm_is_1394_1995_only && !keep_this_irm) { |
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new_root_id = local_id; |
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fw_notice(card, "%s, making local node (%02x) root\n", |
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"IRM is not 1394a compliant", new_root_id); |
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goto pick_me; |
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} |
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transaction_data[0] = cpu_to_be32(0x3f); |
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transaction_data[1] = cpu_to_be32(local_id); |
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spin_unlock_irq(&card->lock); |
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rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, |
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irm_id, generation, SCODE_100, |
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CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID, |
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transaction_data, 8); |
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if (rcode == RCODE_GENERATION) |
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/* Another bus reset, BM work has been rescheduled. */ |
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goto out; |
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bm_id = be32_to_cpu(transaction_data[0]); |
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spin_lock_irq(&card->lock); |
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if (rcode == RCODE_COMPLETE && generation == card->generation) |
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card->bm_node_id = |
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bm_id == 0x3f ? local_id : 0xffc0 | bm_id; |
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spin_unlock_irq(&card->lock); |
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if (rcode == RCODE_COMPLETE && bm_id != 0x3f) { |
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/* Somebody else is BM. Only act as IRM. */ |
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if (local_id == irm_id) |
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allocate_broadcast_channel(card, generation); |
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goto out; |
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} |
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if (rcode == RCODE_SEND_ERROR) { |
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/* |
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* We have been unable to send the lock request due to |
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* some local problem. Let's try again later and hope |
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* that the problem has gone away by then. |
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*/ |
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fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); |
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goto out; |
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} |
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spin_lock_irq(&card->lock); |
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if (rcode != RCODE_COMPLETE && !keep_this_irm) { |
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/* |
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* The lock request failed, maybe the IRM |
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* isn't really IRM capable after all. Let's |
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* do a bus reset and pick the local node as |
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* root, and thus, IRM. |
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*/ |
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new_root_id = local_id; |
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fw_notice(card, "BM lock failed (%s), making local node (%02x) root\n", |
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fw_rcode_string(rcode), new_root_id); |
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goto pick_me; |
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} |
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} else if (card->bm_generation != generation) { |
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/* |
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* We weren't BM in the last generation, and the last |
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* bus reset is less than 125ms ago. Reschedule this job. |
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*/ |
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spin_unlock_irq(&card->lock); |
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fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); |
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goto out; |
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} |
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/* |
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* We're bus manager for this generation, so next step is to |
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* make sure we have an active cycle master and do gap count |
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* optimization. |
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*/ |
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card->bm_generation = generation; |
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if (root_device == NULL) { |
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/* |
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* Either link_on is false, or we failed to read the |
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* config rom. In either case, pick another root. |
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*/ |
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new_root_id = local_id; |
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} else if (!root_device_is_running) { |
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/* |
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* If we haven't probed this device yet, bail out now |
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* and let's try again once that's done. |
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*/ |
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spin_unlock_irq(&card->lock); |
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goto out; |
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} else if (root_device_is_cmc) { |
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/* |
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* We will send out a force root packet for this |
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* node as part of the gap count optimization. |
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*/ |
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new_root_id = root_id; |
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} else { |
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/* |
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* Current root has an active link layer and we |
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* successfully read the config rom, but it's not |
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* cycle master capable. |
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*/ |
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new_root_id = local_id; |
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} |
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pick_me: |
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/* |
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* Pick a gap count from 1394a table E-1. The table doesn't cover |
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* the typically much larger 1394b beta repeater delays though. |
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*/ |
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if (!card->beta_repeaters_present && |
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root_node->max_hops < ARRAY_SIZE(gap_count_table)) |
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gap_count = gap_count_table[root_node->max_hops]; |
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else |
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gap_count = 63; |
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|
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/* |
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* Finally, figure out if we should do a reset or not. If we have |
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* done less than 5 resets with the same physical topology and we |
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* have either a new root or a new gap count setting, let's do it. |
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*/ |
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|
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if (card->bm_retries++ < 5 && |
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(card->gap_count != gap_count || new_root_id != root_id)) |
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do_reset = true; |
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|
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spin_unlock_irq(&card->lock); |
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|
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if (do_reset) { |
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fw_notice(card, "phy config: new root=%x, gap_count=%d\n", |
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new_root_id, gap_count); |
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fw_send_phy_config(card, new_root_id, generation, gap_count); |
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reset_bus(card, true); |
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/* Will allocate broadcast channel after the reset. */ |
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goto out; |
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} |
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if (root_device_is_cmc) { |
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/* |
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* Make sure that the cycle master sends cycle start packets. |
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*/ |
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transaction_data[0] = cpu_to_be32(CSR_STATE_BIT_CMSTR); |
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rcode = fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, |
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root_id, generation, SCODE_100, |
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CSR_REGISTER_BASE + CSR_STATE_SET, |
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transaction_data, 4); |
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if (rcode == RCODE_GENERATION) |
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goto out; |
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} |
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if (local_id == irm_id) |
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allocate_broadcast_channel(card, generation); |
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out: |
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fw_node_put(root_node); |
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out_put_card: |
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fw_card_put(card); |
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} |
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|
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void fw_card_initialize(struct fw_card *card, |
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const struct fw_card_driver *driver, |
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struct device *device) |
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{ |
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static atomic_t index = ATOMIC_INIT(-1); |
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|
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card->index = atomic_inc_return(&index); |
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card->driver = driver; |
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card->device = device; |
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card->current_tlabel = 0; |
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card->tlabel_mask = 0; |
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card->split_timeout_hi = DEFAULT_SPLIT_TIMEOUT / 8000; |
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card->split_timeout_lo = (DEFAULT_SPLIT_TIMEOUT % 8000) << 19; |
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card->split_timeout_cycles = DEFAULT_SPLIT_TIMEOUT; |
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card->split_timeout_jiffies = |
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DIV_ROUND_UP(DEFAULT_SPLIT_TIMEOUT * HZ, 8000); |
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card->color = 0; |
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card->broadcast_channel = BROADCAST_CHANNEL_INITIAL; |
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|
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kref_init(&card->kref); |
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init_completion(&card->done); |
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INIT_LIST_HEAD(&card->transaction_list); |
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INIT_LIST_HEAD(&card->phy_receiver_list); |
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spin_lock_init(&card->lock); |
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|
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card->local_node = NULL; |
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|
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INIT_DELAYED_WORK(&card->br_work, br_work); |
|
INIT_DELAYED_WORK(&card->bm_work, bm_work); |
|
} |
|
EXPORT_SYMBOL(fw_card_initialize); |
|
|
|
int fw_card_add(struct fw_card *card, |
|
u32 max_receive, u32 link_speed, u64 guid) |
|
{ |
|
int ret; |
|
|
|
card->max_receive = max_receive; |
|
card->link_speed = link_speed; |
|
card->guid = guid; |
|
|
|
mutex_lock(&card_mutex); |
|
|
|
generate_config_rom(card, tmp_config_rom); |
|
ret = card->driver->enable(card, tmp_config_rom, config_rom_length); |
|
if (ret == 0) |
|
list_add_tail(&card->link, &card_list); |
|
|
|
mutex_unlock(&card_mutex); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(fw_card_add); |
|
|
|
/* |
|
* The next few functions implement a dummy driver that is used 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 (and failed) by the dummy driver |
|
* instead of calling into the module. Only functions for iso context |
|
* shutdown still need to be provided by the card driver. |
|
* |
|
* .read/write_csr() should never be called anymore after the dummy driver |
|
* was bound since they are only used within request handler context. |
|
* .set_config_rom() is never called since the card is taken out of card_list |
|
* before switching to the dummy driver. |
|
*/ |
|
|
|
static int dummy_read_phy_reg(struct fw_card *card, int address) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
static int dummy_update_phy_reg(struct fw_card *card, int address, |
|
int clear_bits, int set_bits) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
static void dummy_send_request(struct fw_card *card, struct fw_packet *packet) |
|
{ |
|
packet->callback(packet, card, RCODE_CANCELLED); |
|
} |
|
|
|
static void dummy_send_response(struct fw_card *card, struct fw_packet *packet) |
|
{ |
|
packet->callback(packet, card, RCODE_CANCELLED); |
|
} |
|
|
|
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_iso_context *dummy_allocate_iso_context(struct fw_card *card, |
|
int type, int channel, size_t header_size) |
|
{ |
|
return ERR_PTR(-ENODEV); |
|
} |
|
|
|
static int dummy_start_iso(struct fw_iso_context *ctx, |
|
s32 cycle, u32 sync, u32 tags) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
static int dummy_set_iso_channels(struct fw_iso_context *ctx, u64 *channels) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
static int dummy_queue_iso(struct fw_iso_context *ctx, struct fw_iso_packet *p, |
|
struct fw_iso_buffer *buffer, unsigned long payload) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
static void dummy_flush_queue_iso(struct fw_iso_context *ctx) |
|
{ |
|
} |
|
|
|
static int dummy_flush_iso_completions(struct fw_iso_context *ctx) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
static const struct fw_card_driver dummy_driver_template = { |
|
.read_phy_reg = dummy_read_phy_reg, |
|
.update_phy_reg = dummy_update_phy_reg, |
|
.send_request = dummy_send_request, |
|
.send_response = dummy_send_response, |
|
.cancel_packet = dummy_cancel_packet, |
|
.enable_phys_dma = dummy_enable_phys_dma, |
|
.allocate_iso_context = dummy_allocate_iso_context, |
|
.start_iso = dummy_start_iso, |
|
.set_iso_channels = dummy_set_iso_channels, |
|
.queue_iso = dummy_queue_iso, |
|
.flush_queue_iso = dummy_flush_queue_iso, |
|
.flush_iso_completions = dummy_flush_iso_completions, |
|
}; |
|
|
|
void fw_card_release(struct kref *kref) |
|
{ |
|
struct fw_card *card = container_of(kref, struct fw_card, kref); |
|
|
|
complete(&card->done); |
|
} |
|
EXPORT_SYMBOL_GPL(fw_card_release); |
|
|
|
void fw_core_remove_card(struct fw_card *card) |
|
{ |
|
struct fw_card_driver dummy_driver = dummy_driver_template; |
|
|
|
card->driver->update_phy_reg(card, 4, |
|
PHY_LINK_ACTIVE | PHY_CONTENDER, 0); |
|
fw_schedule_bus_reset(card, false, true); |
|
|
|
mutex_lock(&card_mutex); |
|
list_del_init(&card->link); |
|
mutex_unlock(&card_mutex); |
|
|
|
/* Switch off most of the card driver interface. */ |
|
dummy_driver.free_iso_context = card->driver->free_iso_context; |
|
dummy_driver.stop_iso = card->driver->stop_iso; |
|
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)); |
|
} |
|
EXPORT_SYMBOL(fw_core_remove_card);
|
|
|