lkml.org 
[lkml]   [2007]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[PATCH 1/6] firewire: handling of cards, buses, nodes
    Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
    ---
    drivers/firewire/fw-card.c | 544 ++++++++++++++++++++++
    drivers/firewire/fw-device.c | 782 +++++++++++++++++++++++++++++++++
    drivers/firewire/fw-device.h | 149 ++++++
    drivers/firewire/fw-topology.c | 519 +++++++++++++++++++++
    drivers/firewire/fw-topology.h | 94 +++
    5 files changed, 2088 insertions(+)

    Index: linux_juju/drivers/firewire/fw-card.c
    ===================================================================
    --- /dev/null
    +++ linux_juju/drivers/firewire/fw-card.c
    @@ -0,0 +1,544 @@
    +/* -*- 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 <linux/rwsem.h>
    +#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 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 DECLARE_RWSEM(card_rwsem);
    +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_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 = (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 -EINVAL;
    +
    + down_write(&card_rwsem);
    +
    + list_add_tail (&desc->link, &descriptor_list);
    + descriptor_count++;
    + if (desc->immediate > 0)
    + descriptor_count++;
    + update_config_roms();
    +
    + up_write(&card_rwsem);
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(fw_core_add_descriptor);
    +
    +void
    +fw_core_remove_descriptor (struct fw_descriptor *desc)
    +{
    + down_write(&card_rwsem);
    +
    + list_del(&desc->link);
    + descriptor_count--;
    + if (desc->immediate > 0)
    + descriptor_count--;
    + update_config_roms();
    +
    + up_write(&card_rwsem);
    +}
    +EXPORT_SYMBOL(fw_core_remove_descriptor);
    +
    +static const char gap_count_table[] = {
    + 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
    +};
    +
    +struct bm_data {
    + struct fw_transaction t;
    + struct {
    + __be32 arg;
    + __be32 data;
    + } lock;
    + u32 old;
    + int rcode;
    + struct completion done;
    +};
    +
    +static void
    +complete_bm_lock(struct fw_card *card, int rcode,
    + void *payload, size_t length, void *data)
    +{
    + struct bm_data *bmd = data;
    +
    + if (rcode == RCODE_COMPLETE)
    + bmd->old = be32_to_cpu(*(__be32 *) payload);
    + bmd->rcode = rcode;
    + complete(&bmd->done);
    +}
    +
    +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;
    + struct bm_data bmd;
    + unsigned long flags;
    + int root_id, new_root_id, irm_id, gap_count, generation, grace;
    + int do_reset = 0;
    +
    + spin_lock_irqsave(&card->lock, flags);
    +
    + generation = card->generation;
    + root = card->root_node->data;
    + root_id = card->root_node->node_id;
    + grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
    +
    + if (card->bm_generation + 1 == 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. */
    +
    + irm_id = card->irm_node->node_id;
    + if (!card->irm_node->link_on) {
    + new_root_id = card->local_node->node_id;
    + fw_notify("IRM has link off, making local node (%02x) root.\n",
    + new_root_id);
    + goto pick_me;
    + }
    +
    + bmd.lock.arg = cpu_to_be32(0x3f);
    + bmd.lock.data = cpu_to_be32(card->local_node->node_id);
    +
    + spin_unlock_irqrestore(&card->lock, flags);
    +
    + init_completion(&bmd.done);
    + 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,
    + 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. */
    + return;
    + }
    +
    + if (bmd.rcode == RCODE_COMPLETE && bmd.old != 0x3f)
    + /* Somebody else is BM, let them do the work. */
    + return;
    +
    + spin_lock_irqsave(&card->lock, flags);
    + if (bmd.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 = 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
    + * less than 100ms since last bus reset. Reschedule
    + * 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
    + * make sure we have an active cycle master and do gap count
    + * 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. */
    + 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. */
    + 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
    + * 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 = card->local_node->node_id;
    + }
    +
    + pick_me:
    + /* Now figure out what gap count to set. */
    + if (card->topology_type == FW_TOPOLOGY_A &&
    + card->root_node->max_hops < ARRAY_SIZE(gap_count_table))
    + gap_count = gap_count_table[card->root_node->max_hops];
    + else
    + gap_count = 63;
    +
    + /* 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. */
    +
    + if (card->bm_retries++ < 5 &&
    + (card->gap_count != gap_count || new_root_id != root_id))
    + do_reset = 1;
    +
    + 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);
    + }
    +}
    +
    +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);
    +
    + kref_init(&card->kref);
    + card->index = atomic_inc_return(&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;
    +
    + 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;
    +
    + card->max_receive = max_receive;
    + card->link_speed = link_speed;
    + card->guid = guid;
    +
    + /* Activate link_on bit and contender bit in our self ID packets.*/
    + if (card->driver->update_phy_reg(card, 4, 0,
    + PHY_LINK_ACTIVE | PHY_CONTENDER) < 0)
    + return -EIO;
    +
    + /* 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(&card_rwsem);
    + config_rom = generate_config_rom (card, &length);
    + list_add_tail(&card->link, &card_list);
    + up_write(&card_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_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 = {
    + .name = "dummy",
    + .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_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);
    +
    + down_write(&card_rwsem);
    + list_del(&card->link);
    + up_write(&card_rwsem);
    +
    + /* Set up the dummy driver. */
    + card->driver = &dummy_driver;
    +
    + fw_flush_transactions(card);
    +
    + fw_destroy_nodes(card);
    +
    + fw_card_put(card);
    +}
    +EXPORT_SYMBOL(fw_core_remove_card);
    +
    +struct fw_card *
    +fw_card_get(struct fw_card *card)
    +{
    + kref_get(&card->kref);
    +
    + return card;
    +}
    +EXPORT_SYMBOL(fw_card_get);
    +
    +static void
    +release_card(struct kref *kref)
    +{
    + struct fw_card *card = container_of(kref, struct fw_card, kref);
    +
    + kfree(card);
    +}
    +
    +/* 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)
    +{
    + kref_put(&card->kref, release_card);
    +}
    +EXPORT_SYMBOL(fw_card_put);
    +
    +int
    +fw_core_initiate_bus_reset(struct fw_card *card, int short_reset)
    +{
    + int reg = short_reset ? 5 : 1;
    + /* The following values happen to be the same bit. However be
    + * explicit for clarity. */
    + 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);
    Index: linux_juju/drivers/firewire/fw-device.h
    ===================================================================
    --- /dev/null
    +++ linux_juju/drivers/firewire/fw-device.h
    @@ -0,0 +1,149 @@
    +/* -*- c-basic-offset: 8 -*-
    + *
    + * fw-device.h - Device probing and sysfs code.
    + *
    + * 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.
    + */
    +
    +#ifndef __fw_device_h
    +#define __fw_device_h
    +
    +#include <linux/fs.h>
    +#include <linux/cdev.h>
    +#include <asm/atomic.h>
    +
    +enum fw_device_state {
    + FW_DEVICE_INITIALIZING,
    + FW_DEVICE_RUNNING,
    + FW_DEVICE_SHUTDOWN,
    +};
    +
    +struct fw_attribute_group {
    + struct attribute_group *groups[2];
    + struct attribute_group group;
    + struct attribute *attrs[11];
    +};
    +
    +struct fw_device {
    + atomic_t state;
    + struct fw_node *node;
    + int node_id;
    + int generation;
    + struct fw_card *card;
    + struct device device;
    + struct list_head link;
    + struct list_head client_list;
    + u32 *config_rom;
    + size_t config_rom_length;
    + int config_rom_retries;
    + struct delayed_work work;
    + struct fw_attribute_group attribute_group;
    +};
    +
    +static inline struct fw_device *
    +fw_device(struct device *dev)
    +{
    + return container_of(dev, struct fw_device, device);
    +}
    +
    +static inline int
    +fw_device_is_shutdown(struct fw_device *device)
    +{
    + return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
    +}
    +
    +struct fw_device *fw_device_get(struct fw_device *device);
    +void fw_device_put(struct fw_device *device);
    +int fw_device_enable_phys_dma(struct fw_device *device);
    +
    +void fw_device_cdev_update(struct fw_device *device);
    +void fw_device_cdev_remove(struct fw_device *device);
    +
    +struct fw_device *fw_device_from_devt(dev_t devt);
    +extern int fw_cdev_major;
    +
    +struct fw_unit {
    + struct device device;
    + u32 *directory;
    + struct fw_attribute_group attribute_group;
    +};
    +
    +static inline struct fw_unit *
    +fw_unit(struct device *dev)
    +{
    + return container_of(dev, struct fw_unit, device);
    +}
    +
    +#define CSR_OFFSET 0x40
    +#define CSR_LEAF 0x80
    +#define CSR_DIRECTORY 0xc0
    +
    +#define CSR_DESCRIPTOR 0x01
    +#define CSR_VENDOR 0x03
    +#define CSR_HARDWARE_VERSION 0x04
    +#define CSR_NODE_CAPABILITIES 0x0c
    +#define CSR_UNIT 0x11
    +#define CSR_SPECIFIER_ID 0x12
    +#define CSR_VERSION 0x13
    +#define CSR_DEPENDENT_INFO 0x14
    +#define CSR_MODEL 0x17
    +#define CSR_INSTANCE 0x18
    +
    +#define SBP2_COMMAND_SET_SPECIFIER 0x38
    +#define SBP2_COMMAND_SET 0x39
    +#define SBP2_COMMAND_SET_REVISION 0x3b
    +#define SBP2_FIRMWARE_REVISION 0x3c
    +
    +struct fw_csr_iterator {
    + u32 *p;
    + u32 *end;
    +};
    +
    +void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
    +int fw_csr_iterator_next(struct fw_csr_iterator *ci,
    + int *key, int *value);
    +
    +#define FW_MATCH_VENDOR 0x0001
    +#define FW_MATCH_MODEL 0x0002
    +#define FW_MATCH_SPECIFIER_ID 0x0004
    +#define FW_MATCH_VERSION 0x0008
    +
    +struct fw_device_id {
    + u32 match_flags;
    + u32 vendor;
    + u32 model;
    + u32 specifier_id;
    + u32 version;
    + void *driver_data;
    +};
    +
    +struct fw_driver {
    + struct device_driver driver;
    + /* Called when the parent device sits through a bus reset. */
    + void (*update) (struct fw_unit *unit);
    + const struct fw_device_id *id_table;
    +};
    +
    +static inline struct fw_driver *
    +fw_driver(struct device_driver *drv)
    +{
    + return container_of(drv, struct fw_driver, driver);
    +}
    +
    +extern const struct file_operations fw_device_ops;
    +
    +#endif /* __fw_device_h */
    Index: linux_juju/drivers/firewire/fw-device.c
    ===================================================================
    --- /dev/null
    +++ linux_juju/drivers/firewire/fw-device.c
    @@ -0,0 +1,782 @@
    +/* -*- c-basic-offset: 8 -*-
    + *
    + * fw-device.c - Device probing and sysfs code.
    + *
    + * 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/wait.h>
    +#include <linux/errno.h>
    +#include <linux/kthread.h>
    +#include <linux/device.h>
    +#include <linux/delay.h>
    +#include <linux/idr.h>
    +#include <linux/rwsem.h>
    +#include <asm/semaphore.h>
    +#include <linux/ctype.h>
    +#include "fw-transaction.h"
    +#include "fw-topology.h"
    +#include "fw-device.h"
    +
    +void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
    +{
    + ci->p = p + 1;
    + ci->end = ci->p + (p[0] >> 16);
    +}
    +EXPORT_SYMBOL(fw_csr_iterator_init);
    +
    +int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
    +{
    + *key = *ci->p >> 24;
    + *value = *ci->p & 0xffffff;
    +
    + return ci->p++ < ci->end;
    +}
    +EXPORT_SYMBOL(fw_csr_iterator_next);
    +
    +static int is_fw_unit(struct device *dev);
    +
    +static int match_unit_directory(u32 * directory, const struct fw_device_id *id)
    +{
    + struct fw_csr_iterator ci;
    + int key, value, match;
    +
    + match = 0;
    + fw_csr_iterator_init(&ci, directory);
    + while (fw_csr_iterator_next(&ci, &key, &value)) {
    + if (key == CSR_VENDOR && value == id->vendor)
    + match |= FW_MATCH_VENDOR;
    + if (key == CSR_MODEL && value == id->model)
    + match |= FW_MATCH_MODEL;
    + if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
    + match |= FW_MATCH_SPECIFIER_ID;
    + if (key == CSR_VERSION && value == id->version)
    + match |= FW_MATCH_VERSION;
    + }
    +
    + return (match & id->match_flags) == id->match_flags;
    +}
    +
    +static int fw_unit_match(struct device *dev, struct device_driver *drv)
    +{
    + struct fw_unit *unit = fw_unit(dev);
    + struct fw_driver *driver = fw_driver(drv);
    + int i;
    +
    + /* We only allow binding to fw_units. */
    + if (!is_fw_unit(dev))
    + return 0;
    +
    + for (i = 0; driver->id_table[i].match_flags != 0; i++) {
    + if (match_unit_directory(unit->directory, &driver->id_table[i]))
    + return 1;
    + }
    +
    + return 0;
    +}
    +
    +static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
    +{
    + struct fw_device *device = fw_device(unit->device.parent);
    + struct fw_csr_iterator ci;
    +
    + int key, value;
    + int vendor = 0;
    + int model = 0;
    + int specifier_id = 0;
    + int version = 0;
    +
    + fw_csr_iterator_init(&ci, &device->config_rom[5]);
    + while (fw_csr_iterator_next(&ci, &key, &value)) {
    + switch (key) {
    + case CSR_VENDOR:
    + vendor = value;
    + break;
    + case CSR_MODEL:
    + model = value;
    + break;
    + }
    + }
    +
    + fw_csr_iterator_init(&ci, unit->directory);
    + while (fw_csr_iterator_next(&ci, &key, &value)) {
    + switch (key) {
    + case CSR_SPECIFIER_ID:
    + specifier_id = value;
    + break;
    + case CSR_VERSION:
    + version = value;
    + break;
    + }
    + }
    +
    + return snprintf(buffer, buffer_size,
    + "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
    + vendor, model, specifier_id, version);
    +}
    +
    +static int
    +fw_unit_uevent(struct device *dev, char **envp, int num_envp,
    + char *buffer, int buffer_size)
    +{
    + struct fw_unit *unit = fw_unit(dev);
    + char modalias[64];
    + int length = 0;
    + int i = 0;
    +
    + get_modalias(unit, modalias, sizeof modalias);
    +
    + if (add_uevent_var(envp, num_envp, &i,
    + buffer, buffer_size, &length,
    + "MODALIAS=%s", modalias))
    + return -ENOMEM;
    +
    + envp[i] = NULL;
    +
    + return 0;
    +}
    +
    +struct bus_type fw_bus_type = {
    + .name = "firewire",
    + .match = fw_unit_match,
    +};
    +EXPORT_SYMBOL(fw_bus_type);
    +
    +struct fw_device *fw_device_get(struct fw_device *device)
    +{
    + get_device(&device->device);
    +
    + return device;
    +}
    +
    +void fw_device_put(struct fw_device *device)
    +{
    + put_device(&device->device);
    +}
    +
    +static void fw_device_release(struct device *dev)
    +{
    + struct fw_device *device = fw_device(dev);
    + unsigned long flags;
    +
    + /* Take the card lock so we don't set this to NULL while a
    + * FW_NODE_UPDATED callback is being handled. */
    + spin_lock_irqsave(&device->card->lock, flags);
    + device->node->data = NULL;
    + spin_unlock_irqrestore(&device->card->lock, flags);
    +
    + fw_node_put(device->node);
    + fw_card_put(device->card);
    + kfree(device->config_rom);
    + kfree(device);
    +}
    +
    +int fw_device_enable_phys_dma(struct fw_device *device)
    +{
    + return device->card->driver->enable_phys_dma(device->card,
    + device->node_id,
    + device->generation);
    +}
    +EXPORT_SYMBOL(fw_device_enable_phys_dma);
    +
    +struct config_rom_attribute {
    + struct device_attribute attr;
    + u32 key;
    +};
    +
    +static ssize_t
    +show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
    +{
    + struct config_rom_attribute *attr =
    + container_of(dattr, struct config_rom_attribute, attr);
    + struct fw_csr_iterator ci;
    + u32 *dir;
    + int key, value;
    +
    + if (is_fw_unit(dev))
    + dir = fw_unit(dev)->directory;
    + else
    + dir = fw_device(dev)->config_rom + 5;
    +
    + fw_csr_iterator_init(&ci, dir);
    + while (fw_csr_iterator_next(&ci, &key, &value))
    + if (attr->key == key)
    + return snprintf(buf, buf ? PAGE_SIZE : 0,
    + "0x%06x\n", value);
    +
    + return -ENOENT;
    +}
    +
    +#define IMMEDIATE_ATTR(name, key) \
    + { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
    +
    +static ssize_t
    +show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
    +{
    + struct config_rom_attribute *attr =
    + container_of(dattr, struct config_rom_attribute, attr);
    + struct fw_csr_iterator ci;
    + u32 *dir, *block = NULL, *p, *end;
    + int length, key, value, last_key = 0;
    + char *b;
    +
    + if (is_fw_unit(dev))
    + dir = fw_unit(dev)->directory;
    + else
    + dir = fw_device(dev)->config_rom + 5;
    +
    + fw_csr_iterator_init(&ci, dir);
    + while (fw_csr_iterator_next(&ci, &key, &value)) {
    + if (attr->key == last_key &&
    + key == (CSR_DESCRIPTOR | CSR_LEAF))
    + block = ci.p - 1 + value;
    + last_key = key;
    + }
    +
    + if (block == NULL)
    + return -ENOENT;
    +
    + length = min(block[0] >> 16, 256U);
    + if (length < 3)
    + return -ENOENT;
    +
    + if (block[1] != 0 || block[2] != 0)
    + /* Unknown encoding. */
    + return -ENOENT;
    +
    + if (buf == NULL)
    + return length * 4;
    +
    + b = buf;
    + end = &block[length + 1];
    + for (p = &block[3]; p < end; p++, b += 4)
    + * (u32 *) b = (__force u32) __cpu_to_be32(*p);
    +
    + /* Strip trailing whitespace and add newline. */
    + while (b--, (isspace(*b) || *b == '\0') && b > buf);
    + strcpy(b + 1, "\n");
    +
    + return b + 2 - buf;
    +}
    +
    +#define TEXT_LEAF_ATTR(name, key) \
    + { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
    +
    +static struct config_rom_attribute config_rom_attributes[] = {
    + IMMEDIATE_ATTR(vendor, CSR_VENDOR),
    + IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
    + IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
    + IMMEDIATE_ATTR(version, CSR_VERSION),
    + IMMEDIATE_ATTR(model, CSR_MODEL),
    + TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
    + TEXT_LEAF_ATTR(model_name, CSR_MODEL),
    + TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
    +};
    +
    +static void
    +init_fw_attribute_group(struct device *dev,
    + struct device_attribute *attrs,
    + struct fw_attribute_group *group)
    +{
    + struct device_attribute *attr;
    + int i, j;
    +
    + for (j = 0; attrs[j].attr.name != NULL; j++)
    + group->attrs[j] = &attrs[j].attr;
    +
    + for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
    + attr = &config_rom_attributes[i].attr;
    + if (attr->show(dev, attr, NULL) < 0)
    + continue;
    + group->attrs[j++] = &attr->attr;
    + }
    +
    + BUG_ON(j >= ARRAY_SIZE(group->attrs));
    + group->attrs[j++] = NULL;
    + group->groups[0] = &group->group;
    + group->groups[1] = NULL;
    + group->group.attrs = group->attrs;
    + dev->groups = group->groups;
    +}
    +
    +static ssize_t
    +modalias_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct fw_unit *unit = fw_unit(dev);
    + int length;
    +
    + length = get_modalias(unit, buf, PAGE_SIZE);
    + strcpy(buf + length, "\n");
    +
    + return length + 1;
    +}
    +
    +static ssize_t
    +rom_index_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct fw_device *device = fw_device(dev->parent);
    + struct fw_unit *unit = fw_unit(dev);
    +
    + return snprintf(buf, PAGE_SIZE, "%d\n",
    + (int)(unit->directory - device->config_rom));
    +}
    +
    +static struct device_attribute fw_unit_attributes[] = {
    + __ATTR_RO(modalias),
    + __ATTR_RO(rom_index),
    + __ATTR_NULL,
    +};
    +
    +static ssize_t
    +config_rom_show(struct device *dev, struct device_attribute *attr, char *buf)
    +{
    + struct fw_device *device = fw_device(dev);
    +
    + memcpy(buf, device->config_rom, device->config_rom_length * 4);
    +
    + return device->config_rom_length * 4;
    +}
    +
    +static ssize_t
    +guid_show(struct device *dev, struct device_attribute *attr, char *buf)
    +{
    + struct fw_device *device = fw_device(dev);
    + u64 guid;
    +
    + guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4];
    +
    + return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
    + (unsigned long long)guid);
    +}
    +
    +static struct device_attribute fw_device_attributes[] = {
    + __ATTR_RO(config_rom),
    + __ATTR_RO(guid),
    + __ATTR_NULL,
    +};
    +
    +struct read_quadlet_callback_data {
    + struct completion done;
    + int rcode;
    + u32 data;
    +};
    +
    +static void
    +complete_transaction(struct fw_card *card, int rcode,
    + void *payload, size_t length, void *data)
    +{
    + struct read_quadlet_callback_data *callback_data = data;
    +
    + if (rcode == RCODE_COMPLETE)
    + callback_data->data = be32_to_cpu(*(__be32 *)payload);
    + callback_data->rcode = rcode;
    + complete(&callback_data->done);
    +}
    +
    +static int read_rom(struct fw_device *device, int index, u32 * data)
    +{
    + struct read_quadlet_callback_data callback_data;
    + struct fw_transaction t;
    + u64 offset;
    +
    + init_completion(&callback_data.done);
    +
    + offset = 0xfffff0000400ULL + index * 4;
    + fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
    + device->node_id,
    + device->generation, SCODE_100,
    + offset, NULL, 4, complete_transaction, &callback_data);
    +
    + wait_for_completion(&callback_data.done);
    +
    + *data = callback_data.data;
    +
    + return callback_data.rcode;
    +}
    +
    +static int read_bus_info_block(struct fw_device *device)
    +{
    + static u32 rom[256];
    + u32 stack[16], sp, key;
    + int i, end, length;
    +
    + /* First read the bus info block. */
    + for (i = 0; i < 5; i++) {
    + if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
    + return -1;
    + /* As per IEEE1212 7.2, during power-up, devices can
    + * reply with a 0 for the first quadlet of the config
    + * rom to indicate that they are booting (for example,
    + * if the firmware is on the disk of a external
    + * harddisk). In that case we just fail, and the
    + * retry mechanism will try again later. */
    + if (i == 0 && rom[i] == 0)
    + return -1;
    + }
    +
    + /* Now parse the config rom. The config rom is a recursive
    + * directory structure so we parse it using a stack of
    + * references to the blocks that make up the structure. We
    + * push a reference to the root directory on the stack to
    + * start things off. */
    + length = i;
    + sp = 0;
    + stack[sp++] = 0xc0000005;
    + while (sp > 0) {
    + /* Pop the next block reference of the stack. The
    + * lower 24 bits is the offset into the config rom,
    + * the upper 8 bits are the type of the reference the
    + * block. */
    + key = stack[--sp];
    + i = key & 0xffffff;
    + if (i >= ARRAY_SIZE(rom))
    + /* The reference points outside the standard
    + * config rom area, something's fishy. */
    + return -1;
    +
    + /* Read header quadlet for the block to get the length. */
    + if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
    + return -1;
    + end = i + (rom[i] >> 16) + 1;
    + i++;
    + if (end > ARRAY_SIZE(rom))
    + /* This block extends outside standard config
    + * area (and the array we're reading it
    + * into). That's broken, so ignore this
    + * device. */
    + return -1;
    +
    + /* Now read in the block. If this is a directory
    + * block, check the entries as we read them to see if
    + * it references another block, and push it in that case. */
    + while (i < end) {
    + if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
    + return -1;
    + if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
    + sp < ARRAY_SIZE(stack))
    + stack[sp++] = i + rom[i];
    + i++;
    + }
    + if (length < i)
    + length = i;
    + }
    +
    + device->config_rom = kmalloc(length * 4, GFP_KERNEL);
    + if (device->config_rom == NULL)
    + return -1;
    + memcpy(device->config_rom, rom, length * 4);
    + device->config_rom_length = length;
    +
    + return 0;
    +}
    +
    +static void fw_unit_release(struct device *dev)
    +{
    + struct fw_unit *unit = fw_unit(dev);
    +
    + kfree(unit);
    +}
    +
    +static struct device_type fw_unit_type = {
    + .uevent = fw_unit_uevent,
    + .release = fw_unit_release,
    +};
    +
    +static int is_fw_unit(struct device *dev)
    +{
    + return dev->type == &fw_unit_type;
    +}
    +
    +static void create_units(struct fw_device *device)
    +{
    + struct fw_csr_iterator ci;
    + struct fw_unit *unit;
    + int key, value, i;
    +
    + i = 0;
    + fw_csr_iterator_init(&ci, &device->config_rom[5]);
    + while (fw_csr_iterator_next(&ci, &key, &value)) {
    + if (key != (CSR_UNIT | CSR_DIRECTORY))
    + continue;
    +
    + /* Get the address of the unit directory and try to
    + * match the drivers id_tables against it. */
    + unit = kzalloc(sizeof *unit, GFP_KERNEL);
    + if (unit == NULL) {
    + fw_error("failed to allocate memory for unit\n");
    + continue;
    + }
    +
    + unit->directory = ci.p + value - 1;
    + unit->device.bus = &fw_bus_type;
    + unit->device.type = &fw_unit_type;
    + unit->device.parent = &device->device;
    + snprintf(unit->device.bus_id, sizeof unit->device.bus_id,
    + "%s.%d", device->device.bus_id, i++);
    +
    + init_fw_attribute_group(&unit->device,
    + fw_unit_attributes,
    + &unit->attribute_group);
    + if (device_register(&unit->device) < 0)
    + goto skip_unit;
    +
    + continue;
    +
    + skip_unit:
    + kfree(unit);
    + }
    +}
    +
    +static int shutdown_unit(struct device *device, void *data)
    +{
    + device_unregister(device);
    +
    + return 0;
    +}
    +
    +static DECLARE_RWSEM(idr_rwsem);
    +static DEFINE_IDR(fw_device_idr);
    +int fw_cdev_major;
    +
    +struct fw_device *fw_device_from_devt(dev_t devt)
    +{
    + struct fw_device *device;
    +
    + down_read(&idr_rwsem);
    + device = idr_find(&fw_device_idr, MINOR(devt));
    + up_read(&idr_rwsem);
    +
    + return device;
    +}
    +
    +static void fw_device_shutdown(struct work_struct *work)
    +{
    + struct fw_device *device =
    + container_of(work, struct fw_device, work.work);
    + int minor = MINOR(device->device.devt);
    +
    + down_write(&idr_rwsem);
    + idr_remove(&fw_device_idr, minor);
    + up_write(&idr_rwsem);
    +
    + fw_device_cdev_remove(device);
    + device_for_each_child(&device->device, NULL, shutdown_unit);
    + device_unregister(&device->device);
    +}
    +
    +static struct device_type fw_device_type = {
    + .release = fw_device_release,
    +};
    +
    +/* These defines control the retry behavior for reading the config
    + * rom. It shouldn't be necessary to tweak these; if the device
    + * doesn't respond to a config rom read within 10 seconds, it's not
    + * going to respond at all. As for the initial delay, a lot of
    + * devices will be able to respond within half a second after bus
    + * reset. On the other hand, it's not really worth being more
    + * aggressive than that, since it scales pretty well; if 10 devices
    + * are plugged in, they're all getting read within one second. */
    +
    +#define MAX_RETRIES 10
    +#define RETRY_DELAY (3 * HZ)
    +#define INITIAL_DELAY (HZ / 2)
    +
    +static void fw_device_init(struct work_struct *work)
    +{
    + struct fw_device *device =
    + container_of(work, struct fw_device, work.work);
    + int minor, err;
    +
    + /* All failure paths here set node->data to NULL, so that we
    + * don't try to do device_for_each_child() on a kfree()'d
    + * device. */
    +
    + if (read_bus_info_block(device) < 0) {
    + if (device->config_rom_retries < MAX_RETRIES) {
    + device->config_rom_retries++;
    + schedule_delayed_work(&device->work, RETRY_DELAY);
    + } else {
    + fw_notify("giving up on config rom for node id %x\n",
    + device->node_id);
    + if (device->node == device->card->root_node)
    + schedule_delayed_work(&device->card->work, 0);
    + fw_device_release(&device->device);
    + }
    + return;
    + }
    +
    + err = -ENOMEM;
    + down_write(&idr_rwsem);
    + if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
    + err = idr_get_new(&fw_device_idr, device, &minor);
    + up_write(&idr_rwsem);
    + if (err < 0)
    + goto error;
    +
    + device->device.bus = &fw_bus_type;
    + device->device.type = &fw_device_type;
    + device->device.parent = device->card->device;
    + device->device.devt = MKDEV(fw_cdev_major, minor);
    + snprintf(device->device.bus_id, sizeof device->device.bus_id,
    + "fw%d", minor);
    +
    + init_fw_attribute_group(&device->device,
    + fw_device_attributes,
    + &device->attribute_group);
    + if (device_add(&device->device)) {
    + fw_error("Failed to add device.\n");
    + goto error_with_cdev;
    + }
    +
    + create_units(device);
    +
    + /* Transition the device to running state. If it got pulled
    + * out from under us while we did the intialization work, we
    + * have to shut down the device again here. Normally, though,
    + * fw_node_event will be responsible for shutting it down when
    + * necessary. We have to use the atomic cmpxchg here to avoid
    + * racing with the FW_NODE_DESTROYED case in
    + * fw_node_event(). */
    + if (atomic_cmpxchg(&device->state,
    + FW_DEVICE_INITIALIZING,
    + FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
    + fw_device_shutdown(&device->work.work);
    + else
    + fw_notify("created new fw device %s (%d config rom retries)\n",
    + device->device.bus_id, device->config_rom_retries);
    +
    + /* Reschedule the IRM work if we just finished reading the
    + * root node config rom. If this races with a bus reset we
    + * just end up running the IRM work a couple of extra times -
    + * pretty harmless. */
    + if (device->node == device->card->root_node)
    + schedule_delayed_work(&device->card->work, 0);
    +
    + return;
    +
    + error_with_cdev:
    + down_write(&idr_rwsem);
    + idr_remove(&fw_device_idr, minor);
    + up_write(&idr_rwsem);
    + error:
    + put_device(&device->device);
    +}
    +
    +static int update_unit(struct device *dev, void *data)
    +{
    + struct fw_unit *unit = fw_unit(dev);
    + struct fw_driver *driver = (struct fw_driver *)dev->driver;
    +
    + if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
    + down(&dev->sem);
    + driver->update(unit);
    + up(&dev->sem);
    + }
    +
    + return 0;
    +}
    +
    +static void fw_device_update(struct work_struct *work)
    +{
    + struct fw_device *device =
    + container_of(work, struct fw_device, work.work);
    +
    + fw_device_cdev_update(device);
    + device_for_each_child(&device->device, NULL, update_unit);
    +}
    +
    +void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
    +{
    + struct fw_device *device;
    +
    + switch (event) {
    + case FW_NODE_CREATED:
    + case FW_NODE_LINK_ON:
    + if (!node->link_on)
    + break;
    +
    + device = kzalloc(sizeof(*device), GFP_ATOMIC);
    + if (device == NULL)
    + break;
    +
    + /* Do minimal intialization of the device here, the
    + * rest will happen in fw_device_init(). We need the
    + * card and node so we can read the config rom and we
    + * need to do device_initialize() now so
    + * device_for_each_child() in FW_NODE_UPDATED is
    + * doesn't freak out. */
    + device_initialize(&device->device);
    + atomic_set(&device->state, FW_DEVICE_INITIALIZING);
    + device->card = fw_card_get(card);
    + device->node = fw_node_get(node);
    + device->node_id = node->node_id;
    + device->generation = card->generation;
    + INIT_LIST_HEAD(&device->client_list);
    +
    + /* Set the node data to point back to this device so
    + * FW_NODE_UPDATED callbacks can update the node_id
    + * and generation for the device. */
    + node->data = device;
    +
    + /* Many devices are slow to respond after bus resets,
    + * especially if they are bus powered and go through
    + * power-up after getting plugged in. We schedule the
    + * first config rom scan half a second after bus reset. */
    + INIT_DELAYED_WORK(&device->work, fw_device_init);
    + schedule_delayed_work(&device->work, INITIAL_DELAY);
    + break;
    +
    + case FW_NODE_UPDATED:
    + if (!node->link_on || node->data == NULL)
    + break;
    +
    + device = node->data;
    + device->node_id = node->node_id;
    + device->generation = card->generation;
    + if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
    + PREPARE_DELAYED_WORK(&device->work, fw_device_update);
    + schedule_delayed_work(&device->work, 0);
    + }
    + break;
    +
    + case FW_NODE_DESTROYED:
    + case FW_NODE_LINK_OFF:
    + if (!node->data)
    + break;
    +
    + /* Destroy the device associated with the node. There
    + * are two cases here: either the device is fully
    + * initialized (FW_DEVICE_RUNNING) or we're in the
    + * process of reading its config rom
    + * (FW_DEVICE_INITIALIZING). If it is fully
    + * initialized we can reuse device->work to schedule a
    + * full fw_device_shutdown(). If not, there's work
    + * scheduled to read it's config rom, and we just put
    + * the device in shutdown state to have that code fail
    + * to create the device. */
    + device = node->data;
    + if (atomic_xchg(&device->state,
    + FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
    + PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
    + schedule_delayed_work(&device->work, 0);
    + }
    + break;
    + }
    +}
    Index: linux_juju/drivers/firewire/fw-topology.h
    ===================================================================
    --- /dev/null
    +++ linux_juju/drivers/firewire/fw-topology.h
    @@ -0,0 +1,94 @@
    +/* -*- c-basic-offset: 8 -*-
    + *
    + * fw-topology.h -- Incremental bus scan, based on bus topology
    + *
    + * Copyright (C) 2003-2006 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.
    + */
    +
    +#ifndef __fw_topology_h
    +#define __fw_topology_h
    +
    +enum {
    + FW_TOPOLOGY_A = 0x01,
    + FW_TOPOLOGY_B = 0x02,
    + FW_TOPOLOGY_MIXED = 0x03,
    +};
    +
    +enum {
    + FW_NODE_CREATED = 0x00,
    + FW_NODE_UPDATED = 0x01,
    + FW_NODE_DESTROYED = 0x02,
    + FW_NODE_LINK_ON = 0x03,
    + FW_NODE_LINK_OFF = 0x04,
    +};
    +
    +struct fw_port {
    + struct fw_node *node;
    + unsigned speed : 3; /* S100, S200, ... S3200 */
    +};
    +
    +struct fw_node {
    + u16 node_id;
    + u8 color;
    + u8 port_count;
    + unsigned link_on : 1;
    + unsigned initiated_reset : 1;
    + unsigned b_path : 1;
    + u8 phy_speed : 3; /* As in the self ID packet. */
    + u8 max_speed : 5; /* Minimum of all phy-speeds and port speeds on
    + * the path from the local node to this node. */
    + u8 max_depth : 4; /* Maximum depth to any leaf node */
    + u8 max_hops : 4; /* Max hops in this sub tree */
    + atomic_t ref_count;
    +
    + /* For serializing node topology into a list. */
    + struct list_head link;
    +
    + /* Upper layer specific data. */
    + void *data;
    +
    + struct fw_port ports[0];
    +};
    +
    +static inline struct fw_node *
    +fw_node(struct list_head *l)
    +{
    + return list_entry (l, struct fw_node, link);
    +}
    +
    +static inline struct fw_node *
    +fw_node_get(struct fw_node *node)
    +{
    + atomic_inc(&node->ref_count);
    +
    + return node;
    +}
    +
    +static inline void
    +fw_node_put(struct fw_node *node)
    +{
    + if (atomic_dec_and_test(&node->ref_count))
    + kfree(node);
    +}
    +
    +void
    +fw_destroy_nodes(struct fw_card *card);
    +
    +u16
    +crc16_itu_t(const u32 *buffer, size_t length);
    +
    +#endif /* __fw_topology_h */
    Index: linux_juju/drivers/firewire/fw-topology.c
    ===================================================================
    --- /dev/null
    +++ linux_juju/drivers/firewire/fw-topology.c
    @@ -0,0 +1,519 @@
    +/* -*- c-basic-offset: 8 -*-
    + *
    + * fw-topology.c - Incremental bus scan, based on bus topology
    + *
    + * Copyright (C) 2004-2006 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/wait.h>
    +#include <linux/errno.h>
    +#include "fw-transaction.h"
    +#include "fw-topology.h"
    +
    +#define self_id_phy_id(q) (((q) >> 24) & 0x3f)
    +#define self_id_extended(q) (((q) >> 23) & 0x01)
    +#define self_id_link_on(q) (((q) >> 22) & 0x01)
    +#define self_id_gap_count(q) (((q) >> 16) & 0x3f)
    +#define self_id_phy_speed(q) (((q) >> 14) & 0x03)
    +#define self_id_contender(q) (((q) >> 11) & 0x01)
    +#define self_id_phy_initiator(q) (((q) >> 1) & 0x01)
    +#define self_id_more_packets(q) (((q) >> 0) & 0x01)
    +
    +#define self_id_ext_sequence(q) (((q) >> 20) & 0x07)
    +
    +static u32 *count_ports(u32 *sid, int *total_port_count, int *child_port_count)
    +{
    + u32 q;
    + int port_type, shift, seq;
    +
    + *total_port_count = 0;
    + *child_port_count = 0;
    +
    + shift = 6;
    + q = *sid;
    + seq = 0;
    +
    + while (1) {
    + port_type = (q >> shift) & 0x03;
    + switch (port_type) {
    + case SELFID_PORT_CHILD:
    + (*child_port_count)++;
    + case SELFID_PORT_PARENT:
    + case SELFID_PORT_NCONN:
    + (*total_port_count)++;
    + case SELFID_PORT_NONE:
    + break;
    + }
    +
    + shift -= 2;
    + if (shift == 0) {
    + if (!self_id_more_packets(q))
    + return sid + 1;
    +
    + shift = 16;
    + sid++;
    + q = *sid;
    +
    + /* Check that the extra packets actually are
    + * extended self ID packets and that the
    + * sequence numbers in the extended self ID
    + * packets increase as expected. */
    +
    + if (!self_id_extended(q) ||
    + seq != self_id_ext_sequence(q))
    + return NULL;
    +
    + seq++;
    + }
    + }
    +}
    +
    +static int get_port_type(u32 *sid, int port_index)
    +{
    + int index, shift;
    +
    + index = (port_index + 5) / 8;
    + shift = 16 - ((port_index + 5) & 7) * 2;
    + return (sid[index] >> shift) & 0x03;
    +}
    +
    +static struct fw_node *fw_node_create(u32 sid, int port_count, int color)
    +{
    + struct fw_node *node;
    +
    + node = kzalloc(sizeof *node + port_count * sizeof node->ports[0],
    + GFP_ATOMIC);
    + if (node == NULL)
    + return NULL;
    +
    + node->color = color;
    + node->node_id = LOCAL_BUS | self_id_phy_id(sid);
    + node->link_on = self_id_link_on(sid);
    + node->phy_speed = self_id_phy_speed(sid);
    + node->port_count = port_count;
    +
    + atomic_set(&node->ref_count, 1);
    + INIT_LIST_HEAD(&node->link);
    +
    + return node;
    +}
    +
    +/* Compute the maximum hop count for this node and it's children. The
    + * maximum hop count is the maximum number of connections between any
    + * two nodes in the subtree rooted at this node. We need this for
    + * setting the gap count. As we build the tree bottom up in
    + * build_tree() below, this is fairly easy to do: for each node we
    + * maintain the max hop count and the max depth, ie the number of hops
    + * to the furthest leaf. Computing the max hop count breaks down into
    + * two cases: either the path goes through this node, in which case
    + * the hop count is the sum of the two biggest child depths plus 2.
    + * Or it could be the case that the max hop path is entirely
    + * containted in a child tree, in which case the max hop count is just
    + * the max hop count of this child.
    + */
    +static void update_hop_count(struct fw_node *node)
    +{
    + int depths[2] = { -1, -1 };
    + int max_child_hops = 0;
    + int i;
    +
    + for (i = 0; i < node->port_count; i++) {
    + if (node->ports[i].node == NULL)
    + continue;
    +
    + if (node->ports[i].node->max_hops > max_child_hops)
    + max_child_hops = node->ports[i].node->max_hops;
    +
    + if (node->ports[i].node->max_depth > depths[0]) {
    + depths[1] = depths[0];
    + depths[0] = node->ports[i].node->max_depth;
    + } else if (node->ports[i].node->max_depth > depths[1])
    + depths[1] = node->ports[i].node->max_depth;
    + }
    +
    + node->max_depth = depths[0] + 1;
    + node->max_hops = max(max_child_hops, depths[0] + depths[1] + 2);
    +}
    +
    +
    +/**
    + * build_tree - Build the tree representation of the topology
    + * @self_ids: array of self IDs to create the tree from
    + * @self_id_count: the length of the self_ids array
    + * @local_id: the node ID of the local node
    + *
    + * This function builds the tree representation of the topology given
    + * by the self IDs from the latest bus reset. During the construction
    + * of the tree, the function checks that the self IDs are valid and
    + * internally consistent. On succcess this funtions returns the
    + * fw_node corresponding to the local card otherwise NULL.
    + */
    +static struct fw_node *build_tree(struct fw_card *card,
    + u32 *sid, int self_id_count)
    +{
    + struct fw_node *node, *child, *local_node, *irm_node;
    + struct list_head stack, *h;
    + u32 *next_sid, *end, q;
    + int i, port_count, child_port_count, phy_id, parent_count, stack_depth;
    + int gap_count, topology_type;
    +
    + local_node = NULL;
    + node = NULL;
    + INIT_LIST_HEAD(&stack);
    + stack_depth = 0;
    + end = sid + self_id_count;
    + phy_id = 0;
    + irm_node = NULL;
    + gap_count = self_id_gap_count(*sid);
    + topology_type = 0;
    +
    + while (sid < end) {
    + next_sid = count_ports(sid, &port_count, &child_port_count);
    +
    + if (next_sid == NULL) {
    + fw_error("Inconsistent extended self IDs.\n");
    + return NULL;
    + }
    +
    + q = *sid;
    + if (phy_id != self_id_phy_id(q)) {
    + fw_error("PHY ID mismatch in self ID: %d != %d.\n",
    + phy_id, self_id_phy_id(q));
    + return NULL;
    + }
    +
    + if (child_port_count > stack_depth) {
    + fw_error("Topology stack underflow\n");
    + return NULL;
    + }
    +
    + /* Seek back from the top of our stack to find the
    + * start of the child nodes for this node. */
    + for (i = 0, h = &stack; i < child_port_count; i++)
    + h = h->prev;
    + child = fw_node(h);
    +
    + node = fw_node_create(q, port_count, card->color);
    + if (node == NULL) {
    + fw_error("Out of memory while building topology.");
    + return NULL;
    + }
    +
    + if (phy_id == (card->node_id & 0x3f))
    + local_node = node;
    +
    + if (self_id_contender(q))
    + irm_node = node;
    +
    + if (node->phy_speed == SCODE_BETA)
    + topology_type |= FW_TOPOLOGY_B;
    + else
    + topology_type |= FW_TOPOLOGY_A;
    +
    + parent_count = 0;
    +
    + for (i = 0; i < port_count; i++) {
    + switch (get_port_type(sid, i)) {
    + case SELFID_PORT_PARENT:
    + /* Who's your daddy? We dont know the
    + * parent node at this time, so we
    + * temporarily abuse node->color for
    + * remembering the entry in the
    + * node->ports array where the parent
    + * node should be. Later, when we
    + * handle the parent node, we fix up
    + * the reference.
    + */
    + parent_count++;
    + node->color = i;
    + break;
    +
    + case SELFID_PORT_CHILD:
    + node->ports[i].node = child;
    + /* Fix up parent reference for this
    + * child node. */
    + child->ports[child->color].node = node;
    + child->color = card->color;
    + child = fw_node(child->link.next);
    + break;
    + }
    + }
    +
    + /* Check that the node reports exactly one parent
    + * port, except for the root, which of course should
    + * have no parents. */
    + if ((next_sid == end && parent_count != 0) ||
    + (next_sid < end && parent_count != 1)) {
    + fw_error("Parent port inconsistency for node %d: "
    + "parent_count=%d\n", phy_id, parent_count);
    + return NULL;
    + }
    +
    + /* Pop the child nodes off the stack and push the new node. */
    + __list_del(h->prev, &stack);
    + list_add_tail(&node->link, &stack);
    + stack_depth += 1 - child_port_count;
    +
    + /* If all PHYs does not report the same gap count
    + * setting, we fall back to 63 which will force a gap
    + * count reconfiguration and a reset. */
    + if (self_id_gap_count(q) != gap_count)
    + gap_count = 63;
    +
    + update_hop_count(node);
    +
    + sid = next_sid;
    + phy_id++;
    + }
    +
    + card->root_node = node;
    + card->irm_node = irm_node;
    + card->gap_count = gap_count;
    + card->topology_type = topology_type;
    +
    + return local_node;
    +}
    +
    +typedef void (*fw_node_callback_t) (struct fw_card * card,
    + struct fw_node * node,
    + struct fw_node * parent);
    +
    +static void
    +for_each_fw_node(struct fw_card *card, struct fw_node *root,
    + fw_node_callback_t callback)
    +{
    + struct list_head list;
    + struct fw_node *node, *next, *child, *parent;
    + int i;
    +
    + INIT_LIST_HEAD(&list);
    +
    + fw_node_get(root);
    + list_add_tail(&root->link, &list);
    + parent = NULL;
    + list_for_each_entry(node, &list, link) {
    + node->color = card->color;
    +
    + for (i = 0; i < node->port_count; i++) {
    + child = node->ports[i].node;
    + if (!child)
    + continue;
    + if (child->color == card->color)
    + parent = child;
    + else {
    + fw_node_get(child);
    + list_add_tail(&child->link, &list);
    + }
    + }
    +
    + callback(card, node, parent);
    + }
    +
    + list_for_each_entry_safe(node, next, &list, link)
    + fw_node_put(node);
    +}
    +
    +static void
    +report_lost_node(struct fw_card *card,
    + struct fw_node *node, struct fw_node *parent)
    +{
    + fw_node_event(card, node, FW_NODE_DESTROYED);
    + fw_node_put(node);
    +}
    +
    +static void
    +report_found_node(struct fw_card *card,
    + struct fw_node *node, struct fw_node *parent)
    +{
    + int b_path = (node->phy_speed == SCODE_BETA);
    +
    + if (parent != NULL) {
    + /* min() macro doesn't work here with gcc 3.4 */
    + node->max_speed = parent->max_speed < node->phy_speed ?
    + parent->max_speed : node->phy_speed;
    + node->b_path = parent->b_path && b_path;
    + } else {
    + node->max_speed = node->phy_speed;
    + node->b_path = b_path;
    + }
    +
    + fw_node_event(card, node, FW_NODE_CREATED);
    +}
    +
    +void fw_destroy_nodes(struct fw_card *card)
    +{
    + unsigned long flags;
    +
    + spin_lock_irqsave(&card->lock, flags);
    + card->color++;
    + if (card->local_node != NULL)
    + for_each_fw_node(card, card->local_node, report_lost_node);
    + spin_unlock_irqrestore(&card->lock, flags);
    +}
    +
    +static void move_tree(struct fw_node *node0, struct fw_node *node1, int port)
    +{
    + struct fw_node *tree;
    + int i;
    +
    + tree = node1->ports[port].node;
    + node0->ports[port].node = tree;
    + for (i = 0; i < tree->port_count; i++) {
    + if (tree->ports[i].node == node1) {
    + tree->ports[i].node = node0;
    + break;
    + }
    + }
    +}
    +
    +/**
    + * update_tree - compare the old topology tree for card with the new
    + * one specified by root. Queue the nodes and mark them as either
    + * found, lost or updated. Update the nodes in the card topology tree
    + * as we go.
    + */
    +static void
    +update_tree(struct fw_card *card, struct fw_node *root)
    +{
    + struct list_head list0, list1;
    + struct fw_node *node0, *node1;
    + int i, event;
    +
    + INIT_LIST_HEAD(&list0);
    + list_add_tail(&card->local_node->link, &list0);
    + INIT_LIST_HEAD(&list1);
    + list_add_tail(&root->link, &list1);
    +
    + node0 = fw_node(list0.next);
    + node1 = fw_node(list1.next);
    +
    + while (&node0->link != &list0) {
    +
    + /* assert(node0->port_count == node1->port_count); */
    + if (node0->link_on && !node1->link_on)
    + event = FW_NODE_LINK_OFF;
    + else if (!node0->link_on && node1->link_on)
    + event = FW_NODE_LINK_ON;
    + else
    + event = FW_NODE_UPDATED;
    +
    + node0->node_id = node1->node_id;
    + node0->color = card->color;
    + node0->link_on = node1->link_on;
    + node0->initiated_reset = node1->initiated_reset;
    + node0->max_hops = node1->max_hops;
    + node1->color = card->color;
    + fw_node_event(card, node0, event);
    +
    + if (card->root_node == node1)
    + card->root_node = node0;
    + if (card->irm_node == node1)
    + card->irm_node = node0;
    +
    + for (i = 0; i < node0->port_count; i++) {
    + if (node0->ports[i].node && node1->ports[i].node) {
    + /* This port didn't change, queue the
    + * connected node for further
    + * investigation. */
    + if (node0->ports[i].node->color == card->color)
    + continue;
    + list_add_tail(&node0->ports[i].node->link,
    + &list0);
    + list_add_tail(&node1->ports[i].node->link,
    + &list1);
    + } else if (node0->ports[i].node) {
    + /* The nodes connected here were
    + * unplugged; unref the lost nodes and
    + * queue FW_NODE_LOST callbacks for
    + * them. */
    +
    + for_each_fw_node(card, node0->ports[i].node,
    + report_lost_node);
    + node0->ports[i].node = NULL;
    + } else if (node1->ports[i].node) {
    + /* One or more node were connected to
    + * this port. Move the new nodes into
    + * the tree and queue FW_NODE_CREATED
    + * callbacks for them. */
    + move_tree(node0, node1, i);
    + for_each_fw_node(card, node0->ports[i].node,
    + report_found_node);
    + }
    + }
    +
    + node0 = fw_node(node0->link.next);
    + node1 = fw_node(node1->link.next);
    + }
    +}
    +
    +static void
    +update_topology_map(struct fw_card *card, u32 *self_ids, int self_id_count)
    +{
    + int node_count;
    + u32 crc;
    +
    + card->topology_map[1]++;
    + node_count = (card->root_node->node_id & 0x3f) + 1;
    + card->topology_map[2] = (node_count << 16) | self_id_count;
    + crc = crc16_itu_t(card->topology_map + 1, self_id_count + 2);
    + card->topology_map[0] = ((self_id_count + 2) << 16) | crc;
    + memcpy(&card->topology_map[3], self_ids, self_id_count * 4);
    +}
    +
    +void
    +fw_core_handle_bus_reset(struct fw_card *card,
    + int node_id, int generation,
    + int self_id_count, u32 * self_ids)
    +{
    + struct fw_node *local_node;
    + unsigned long flags;
    +
    + fw_flush_transactions(card);
    +
    + spin_lock_irqsave(&card->lock, flags);
    +
    + /* If the new topology has a different self_id_count the topology
    + * changed, either nodes were added or removed. In that case we
    + * reset the IRM reset counter. */
    + if (card->self_id_count != self_id_count)
    + card->bm_retries = 0;
    +
    + card->node_id = node_id;
    + card->generation = generation;
    + card->reset_jiffies = jiffies;
    + schedule_delayed_work(&card->work, 0);
    +
    + local_node = build_tree(card, self_ids, self_id_count);
    +
    + update_topology_map(card, self_ids, self_id_count);
    +
    + card->color++;
    +
    + if (local_node == NULL) {
    + fw_error("topology build failed\n");
    + /* FIXME: We need to issue a bus reset in this case. */
    + } else if (card->local_node == NULL) {
    + card->local_node = local_node;
    + for_each_fw_node(card, local_node, report_found_node);
    + } else {
    + update_tree(card, local_node);
    + }
    +
    + spin_unlock_irqrestore(&card->lock, flags);
    +}
    +EXPORT_SYMBOL(fw_core_handle_bus_reset);
    --
    Stefan Richter
    -=====-=-=== -=-= ---=-
    http://arcgraph.de/sr/
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-05-02 14:23    [W:0.134 / U:31.184 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site