[PATCH 3/3] Import fw-sbp2 driver.

Kristian Høgsberg
2006-12-05T05:27:06Z

Pull in the fw-sbp2 driver for firewire storage devices.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
---

drivers/fw/fw-ohci.c | 2
drivers/fw/fw-sbp2.c | 1083 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 1084 insertions(+), 1 deletions(-)

diff --git a/drivers/fw/fw-ohci.c b/drivers/fw/fw-ohci.c
index 78e0324..444e8f0 100644
--- a/drivers/fw/fw-ohci.c
+++ b/drivers/fw/fw-ohci.c
@@ -594,7 +594,7 @@ static void bus_reset_tasklet(unsigned l
self_id_count, ohci->self_id_buffer);
}

-static irqreturn_t irq_handler(int irq, void *data, struct pt_regs *unused)
+static irqreturn_t irq_handler(int irq, void *data)
{
struct fw_ohci *ohci = data;
u32 event, iso_event;
diff --git a/drivers/fw/fw-sbp2.c b/drivers/fw/fw-sbp2.c
new file mode 100644
index 0000000..e0e7590
--- /dev/null
+++ b/drivers/fw/fw-sbp2.c
@@ -0,0 +1,1083 @@
+/* -*- c-basic-offset: 8 -*-
+ * fw-sbp2.c -- SBP2 driver (SCSI over IEEE1394)
+ *
+ * Copyright © 2005 Kristian Høgsberg <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/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+
+#include "fw-transaction.h"
+#include "fw-topology.h"
+#include "fw-device.h"
+
+/* I don't know why the SCSI stack doesn't define something like this... */
+typedef void (*scsi_done_fn_t) (struct scsi_cmnd *);
+
+static const char sbp2_driver_name[] = "sbp2";
+
+struct sbp2_device {
+ struct fw_address_handler address_handler;
+ struct list_head orb_list;
+ u64 management_agent_address;
+ u64 command_block_agent_address;
+ u32 workarounds;
+ int login_id;
+
+ /* We cache these addresses and only update them once we've
+ * logged in or reconnected to the sbp2 device. That way, any
+ * IO to the device will automatically fail and get retried if
+ * it happens in a window where the device is not ready to
+ * handle it (e.g. after a bus reset but before we reconnect). */
+ int node_id;
+ int address_high;
+ int generation;
+
+ struct work_struct work;
+ struct Scsi_Host *scsi_host;
+};
+
+#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
+#define SBP2_MAX_SECTORS 255 /* Max sectors supported */
+#define SBP2_MAX_CMDS 8 /* This should be safe */
+
+#define SBP2_ORB_NULL 0x80000000
+
+#define SBP2_DIRECTION_TO_MEDIA 0x0
+#define SBP2_DIRECTION_FROM_MEDIA 0x1
+
+/* Unit directory keys */
+#define SBP2_COMMAND_SET_SPECIFIER 0x38
+#define SBP2_COMMAND_SET 0x39
+#define SBP2_COMMAND_SET_REVISION 0x3b
+#define SBP2_FIRMWARE_REVISION 0x3c
+
+/* Flags for detected oddities and brokeness */
+#define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
+#define SBP2_WORKAROUND_INQUIRY_36 0x2
+#define SBP2_WORKAROUND_MODE_SENSE_8 0x4
+#define SBP2_WORKAROUND_FIX_CAPACITY 0x8
+#define SBP2_WORKAROUND_OVERRIDE 0x100
+
+/* Management orb opcodes */
+#define SBP2_LOGIN_REQUEST 0x0
+#define SBP2_QUERY_LOGINS_REQUEST 0x1
+#define SBP2_RECONNECT_REQUEST 0x3
+#define SBP2_SET_PASSWORD_REQUEST 0x4
+#define SBP2_LOGOUT_REQUEST 0x7
+#define SBP2_ABORT_TASK_REQUEST 0xb
+#define SBP2_ABORT_TASK_SET 0xc
+#define SBP2_LOGICAL_UNIT_RESET 0xe
+#define SBP2_TARGET_RESET_REQUEST 0xf
+
+/* Offsets for command block agent registers */
+#define SBP2_AGENT_STATE 0x00
+#define SBP2_AGENT_RESET 0x04
+#define SBP2_ORB_POINTER 0x08
+#define SBP2_DOORBELL 0x10
+#define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
+
+/* Status write response codes */
+#define SBP2_STATUS_REQUEST_COMPLETE 0x0
+#define SBP2_STATUS_TRANSPORT_FAILURE 0x1
+#define SBP2_STATUS_ILLEGAL_REQUEST 0x2
+#define SBP2_STATUS_VENDOR_DEPENDENT 0x3
+
+struct sbp2_status {
+ unsigned int orb_high:16;
+ unsigned int sbp_status:8;
+ unsigned int len:3;
+ unsigned int dead:1;
+ unsigned int response:2;
+ unsigned int source:2;
+ u32 orb_low;
+ u8 data[24];
+};
+
+struct sbp2_orb {
+ struct fw_transaction t;
+ dma_addr_t request_bus;
+ int rcode;
+ u32 pointer[2];
+ void (*callback) (struct sbp2_orb * orb, struct sbp2_status * status);
+ struct list_head link;
+};
+
+struct sbp2_management_orb {
+ struct sbp2_orb base;
+ struct {
+ u32 password_high;
+ u32 password_low;
+ u32 response_high;
+ u32 response_low;
+ unsigned int lun:16;
+ unsigned int function:4;
+ unsigned int reconnect:4;
+ unsigned int reserved:4;
+ unsigned int exclusive:1;
+ unsigned int request_format:2;
+ unsigned int notify:1;
+ unsigned int response_length:16;
+ unsigned int password_length:16;
+ u32 status_fifo_high;
+ u32 status_fifo_low;
+ } request;
+ u32 response[4];
+ dma_addr_t response_bus;
+ struct completion done;
+ struct sbp2_status status;
+};
+
+struct sbp2_login_response {
+ u16 login_id;
+ u16 length;
+ u32 command_block_agent_high;
+ u32 command_block_agent_low;
+ u32 reconnect_hold;
+};
+
+struct sbp2_command_orb {
+ struct sbp2_orb base;
+ struct {
+ u32 next_high;
+ u32 next_low;
+ u32 data_descriptor_high;
+ u32 data_descriptor_low;
+ u32 data_size:16;
+ u32 page_size:3;
+ u32 page_table_present:1;
+ u32 max_payload:4;
+ u32 speed:3;
+ u32 direction:1;
+ u32 reserved:1;
+ u32 request_format:2;
+ u32 notify:1;
+ u8 command_block[12];
+ } request;
+ struct scsi_cmnd *cmd;
+ scsi_done_fn_t done;
+ struct fw_unit *unit;
+
+ struct {
+ u16 segment_base_high;
+ u16 length;
+ u32 segment_base_low;
+ } page_table[SG_ALL];
+ dma_addr_t page_table_bus;
+ dma_addr_t request_buffer_bus;
+};
+
+/*
+ * List of devices with known bugs.
+ *
+ * The firmware_revision field, masked with 0xffff00, is the best
+ * indicator for the type of bridge chip of a device. It yields a few
+ * false positives but this did not break correctly behaving devices
+ * so far. We use ~0 as a wildcard, since the 24 bit values we get
+ * from the config rom can never match that.
+ */
+static const struct {
+ u32 firmware_revision;
+ u32 model;
+ unsigned workarounds;
+} sbp2_workarounds_table[] = {
+ /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
+ .firmware_revision = 0x002800,
+ .model = 0x001010,
+ .workarounds = SBP2_WORKAROUND_INQUIRY_36 |
+ SBP2_WORKAROUND_MODE_SENSE_8,
+ },
+ /* Initio bridges, actually only needed for some older ones */ {
+ .firmware_revision = 0x000200,
+ .model = ~0,
+ .workarounds = SBP2_WORKAROUND_INQUIRY_36,
+ },
+ /* Symbios bridge */ {
+ .firmware_revision = 0xa0b800,
+ .model = ~0,
+ .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
+ },
+ /*
+ * Note about the following Apple iPod blacklist entries:
+ *
+ * There are iPods (2nd gen, 3rd gen) with model_id==0. Since our
+ * matching logic treats 0 as a wildcard, we cannot match this ID
+ * without rewriting the matching routine. Fortunately these iPods
+ * do not feature the read_capacity bug according to one report.
+ * Read_capacity behaviour as well as model_id could change due to
+ * Apple-supplied firmware updates though.
+ */
+ /* iPod 4th generation */ {
+ .firmware_revision = 0x0a2700,
+ .model = 0x000021,
+ .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
+ },
+ /* iPod mini */ {
+ .firmware_revision = 0x0a2700,
+ .model = 0x000023,
+ .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
+ },
+ /* iPod Photo */ {
+ .firmware_revision = 0x0a2700,
+ .model = 0x00007e,
+ .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
+ }
+};
+
+static void
+sbp2_status_write(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source,
+ int generation, int speed,
+ unsigned long long offset,
+ u32 * payload, size_t length, void *callback_data)
+{
+ struct fw_unit *unit = (struct fw_unit *)callback_data;
+ struct sbp2_device *sd = unit->device.driver_data;
+ struct sbp2_orb *orb;
+ struct sbp2_status status;
+ size_t header_size;
+ unsigned long flags;
+
+ if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
+ length == 0 || length > sizeof status) {
+ fw_send_response(card, request, RCODE_TYPE_ERROR);
+ return;
+ }
+
+ header_size = min(length, 2 * sizeof(u32));
+ fw_memcpy_from_be32(&status, payload, header_size);
+ if (length > header_size)
+ memcpy(status.data, &payload[2], length - header_size);
+ if (status.source == 2 || status.source == 3) {
+ fw_notify("non-orb related status write, not handled\n");
+ fw_send_response(card, request, RCODE_COMPLETE);
+ return;
+ }
+
+ /* Lookup the orb corresponding to this status write. */
+ spin_lock_irqsave(&card->lock, flags);
+ list_for_each_entry(orb, &sd->orb_list, link) {
+ if (status.orb_high == 0 &&
+ status.orb_low == orb->request_bus) {
+ list_del(&orb->link);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
+
+ if (&orb->link != &sd->orb_list)
+ orb->callback(orb, &status);
+ else
+ fw_error("status write for unknown orb\n");
+
+ fw_send_response(card, request, RCODE_COMPLETE);
+}
+
+static void
+complete_transaction(struct fw_card *card, int rcode,
+ u32 *payload, size_t length, void *data)
+{
+ struct sbp2_orb *orb = data;
+ unsigned long flags;
+
+ orb->rcode = rcode;
+ if (rcode != RCODE_COMPLETE) {
+ spin_lock_irqsave(&card->lock, flags);
+ list_del(&orb->link);
+ spin_unlock_irqrestore(&card->lock, flags);
+ orb->callback(orb, NULL);
+ }
+}
+
+static void
+sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
+ int node_id, int generation, u64 offset)
+{
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ unsigned long flags;
+
+ orb->pointer[0] = 0;
+ orb->pointer[1] = orb->request_bus;
+ fw_memcpy_to_be32(orb->pointer, orb->pointer, sizeof orb->pointer);
+
+ spin_lock_irqsave(&device->card->lock, flags);
+ list_add_tail(&orb->link, &sd->orb_list);
+ spin_unlock_irqrestore(&device->card->lock, flags);
+
+ fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
+ node_id | LOCAL_BUS, generation,
+ device->node->max_speed, offset,
+ orb->pointer, sizeof orb->pointer,
+ complete_transaction, orb);
+}
+
+static void sbp2_cancel_orbs(struct fw_unit *unit)
+{
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ struct sbp2_orb *orb, *next;
+ struct list_head list;
+ unsigned long flags;
+
+ INIT_LIST_HEAD(&list);
+ spin_lock_irqsave(&device->card->lock, flags);
+ list_splice_init(&sd->orb_list, &list);
+ spin_unlock_irqrestore(&device->card->lock, flags);
+
+ list_for_each_entry_safe(orb, next, &list, link) {
+ orb->rcode = RCODE_CANCELLED;
+ orb->callback(orb, NULL);
+ }
+}
+
+static void
+complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
+{
+ struct sbp2_management_orb *orb =
+ (struct sbp2_management_orb *)base_orb;
+
+ if (status)
+ memcpy(&orb->status, status, sizeof *status);
+ complete(&orb->done);
+}
+
+static int
+sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
+ int function, int lun, void *response)
+{
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ struct sbp2_management_orb *orb;
+ unsigned long timeout;
+ int retval = -EIO;
+
+ orb = kzalloc(sizeof *orb, GFP_ATOMIC);
+ if (orb == NULL)
+ return -ENOMEM;
+
+ /* The sbp2 device is going to send a block read request to
+ * read out the request from host memory, so map it for
+ * dma. */
+ orb->base.request_bus =
+ dma_map_single(device->card->device, &orb->request,
+ sizeof orb->request, DMA_TO_DEVICE);
+
+ orb->response_bus =
+ dma_map_single(device->card->device, &orb->response,
+ sizeof orb->response, DMA_FROM_DEVICE);
+
+ orb->request.response_high = 0;
+ orb->request.response_low = orb->response_bus;
+ orb->request.notify = 1;
+ orb->request.function = function;
+ orb->request.lun = lun;
+ orb->request.response_length = sizeof orb->response;
+ orb->request.status_fifo_high = sd->address_handler.offset >> 32;
+ orb->request.status_fifo_low = sd->address_handler.offset;
+
+ /* FIXME: Yeah, ok this isn't elegant, we hardwire exclusive
+ * login and 1 second reconnect time. The reconnect setting
+ * is probably fine, but the exclusive login should be an
+ * option. */
+ if (function == SBP2_LOGIN_REQUEST) {
+ orb->request.exclusive = 1;
+ orb->request.reconnect = 0;
+ }
+
+ fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
+
+ init_completion(&orb->done);
+ orb->base.callback = complete_management_orb;
+ sbp2_send_orb(&orb->base, unit,
+ node_id, generation, sd->management_agent_address);
+
+ timeout = wait_for_completion_timeout(&orb->done, 10 * HZ);
+
+ /* FIXME: Handle bus reset race here. */
+
+ if (orb->base.rcode != RCODE_COMPLETE) {
+ fw_error("management write failed, rcode 0x%02x\n",
+ orb->base.rcode);
+ goto out;
+ }
+
+ if (timeout == 0) {
+ fw_error("orb reply timed out, rcode=0x%02x\n",
+ orb->base.rcode);
+ goto out;
+ }
+
+ if (orb->status.response != 0 || orb->status.sbp_status != 0) {
+ fw_error("error status: %d:%d\n",
+ orb->status.response, orb->status.sbp_status);
+ goto out;
+ }
+
+ retval = 0;
+ out:
+ dma_unmap_single(device->card->device, orb->base.request_bus,
+ sizeof orb->request, DMA_TO_DEVICE);
+ dma_unmap_single(device->card->device, orb->response_bus,
+ sizeof orb->response, DMA_FROM_DEVICE);
+
+ if (response)
+ fw_memcpy_from_be32(response,
+ orb->response, sizeof orb->response);
+
+ kfree(orb);
+
+ return retval;
+}
+
+static void
+complete_agent_reset_write(struct fw_card *card, int rcode,
+ u32 *payload, size_t length, void *data)
+{
+ struct fw_transaction *t = data;
+
+ fw_notify("agent reset write rcode=%d\n", rcode);
+ kfree(t);
+}
+
+static int sbp2_agent_reset(struct fw_unit *unit)
+{
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ struct fw_transaction *t;
+ static u32 zero;
+
+ t = kzalloc(sizeof *t, GFP_ATOMIC);
+ if (t == NULL)
+ return -ENOMEM;
+
+ fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
+ sd->node_id | LOCAL_BUS, sd->generation, SCODE_400,
+ sd->command_block_agent_address + SBP2_AGENT_RESET,
+ &zero, sizeof zero, complete_agent_reset_write, t);
+
+ return 0;
+}
+
+static int add_scsi_devices(struct fw_unit *unit);
+static void remove_scsi_devices(struct fw_unit *unit);
+
+static int sbp2_probe(struct device *dev)
+{
+ struct fw_unit *unit = fw_unit(dev);
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd;
+ struct fw_csr_iterator ci;
+ int i, key, value, lun, retval;
+ int node_id, generation, local_node_id;
+ struct sbp2_login_response response;
+ u32 model, firmware_revision;
+
+ sd = kzalloc(sizeof *sd, GFP_KERNEL);
+ if (sd == NULL)
+ return -ENOMEM;
+
+ unit->device.driver_data = sd;
+ INIT_LIST_HEAD(&sd->orb_list);
+
+ sd->address_handler.length = 0x100;
+ sd->address_handler.address_callback = sbp2_status_write;
+ sd->address_handler.callback_data = unit;
+
+ if (fw_core_add_address_handler(&sd->address_handler,
+ &fw_high_memory_region) < 0) {
+ kfree(sd);
+ return -EBUSY;
+ }
+
+ if (fw_device_enable_phys_dma(device) < 0) {
+ fw_core_remove_address_handler(&sd->address_handler);
+ kfree(sd);
+ return -EBUSY;
+ }
+
+ /* Scan unit directory to get management agent address,
+ * firmware revison and model. Initialize firmware_revision
+ * and model to values that wont match anything in our table. */
+ firmware_revision = 0xff000000;
+ model = 0xff000000;
+ fw_csr_iterator_init(&ci, unit->directory);
+ while (fw_csr_iterator_next(&ci, &key, &value)) {
+ switch (key) {
+ case CSR_DEPENDENT_INFO | CSR_OFFSET:
+ sd->management_agent_address =
+ 0xfffff0000000ULL + 4 * value;
+ break;
+ case SBP2_FIRMWARE_REVISION:
+ firmware_revision = value;
+ break;
+ case CSR_MODEL:
+ model = value;
+ break;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
+ if (sbp2_workarounds_table[i].firmware_revision !=
+ (firmware_revision & 0xffffff00))
+ continue;
+ if (sbp2_workarounds_table[i].model != model)
+ continue;
+ sd->workarounds |= sbp2_workarounds_table[i].workarounds;
+ break;
+ }
+
+ if (sd->workarounds)
+ fw_notify("Workarounds for node %s: 0x%x "
+ "(firmware_revision 0x%06x, model_id 0x%06x)\n",
+ unit->device.bus_id,
+ sd->workarounds, firmware_revision, model);
+
+ /* FIXME: Make this work for multi-lun devices. */
+ lun = 0;
+
+ generation = device->card->generation;
+ node_id = device->node->node_id;
+ local_node_id = device->card->local_node->node_id;
+
+ /* FIXME: We should probably do this from a keventd callback
+ * and handle retries by rescheduling the work. */
+ if (sbp2_send_management_orb(unit, node_id, generation,
+ SBP2_LOGIN_REQUEST, lun, &response) < 0) {
+ fw_core_remove_address_handler(&sd->address_handler);
+ kfree(sd);
+ return -EBUSY;
+ }
+
+ sd->generation = generation;
+ sd->node_id = node_id;
+ sd->address_high = (LOCAL_BUS | local_node_id) << 16;
+
+ /* Get command block agent offset and login id. */
+ sd->command_block_agent_address =
+ ((u64) response.command_block_agent_high << 32) |
+ response.command_block_agent_low;
+ sd->login_id = response.login_id;
+
+ fw_notify("logged in to sbp2 unit %s\n", unit->device.bus_id);
+ fw_notify(" - management_agent_address: 0x%012llx\n",
+ sd->management_agent_address);
+ fw_notify(" - command_block_agent_address: 0x%012llx\n",
+ sd->command_block_agent_address);
+ fw_notify(" - status write address: 0x%012llx\n",
+ sd->address_handler.offset);
+
+#if 0
+ /* FIXME: The linux1394 sbp2 does these last few steps. */
+ sbp2_set_busy_timeout(scsi_id);
+
+ sbp2_max_speed_and_size(scsi_id);
+#endif
+
+ sbp2_agent_reset(unit);
+
+ retval = add_scsi_devices(unit);
+ if (retval < 0) {
+ sbp2_send_management_orb(unit, sd->node_id, sd->generation,
+ SBP2_LOGOUT_REQUEST, sd->login_id,
+ NULL);
+ fw_core_remove_address_handler(&sd->address_handler);
+ kfree(sd);
+ return retval;
+ }
+
+ return 0;
+}
+
+static int sbp2_remove(struct device *dev)
+{
+ struct fw_unit *unit = fw_unit(dev);
+ struct sbp2_device *sd = unit->device.driver_data;
+
+ sbp2_send_management_orb(unit, sd->node_id, sd->generation,
+ SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
+
+ remove_scsi_devices(unit);
+
+ fw_core_remove_address_handler(&sd->address_handler);
+ kfree(sd);
+
+ fw_notify("removed sbp2 unit %s\n", dev->bus_id);
+
+ return 0;
+}
+
+static void sbp2_reconnect(void *data)
+{
+ struct fw_unit *unit = data;
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ int generation, node_id, local_node_id;
+
+ fw_notify("in sbp2_reconnect, reconnecting to unit %s\n",
+ unit->device.bus_id);
+
+ generation = device->card->generation;
+ node_id = device->node->node_id;
+ local_node_id = device->card->local_node->node_id;
+
+ sbp2_send_management_orb(unit, node_id, generation,
+ SBP2_RECONNECT_REQUEST, sd->login_id, NULL);
+
+ /* FIXME: handle reconnect failures. */
+
+ sbp2_cancel_orbs(unit);
+
+ sd->generation = generation;
+ sd->node_id = node_id;
+ sd->address_high = (LOCAL_BUS | local_node_id) << 16;
+}
+
+static void sbp2_update(struct fw_unit *unit)
+{
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+
+ fw_device_enable_phys_dma(device);
+
+ INIT_WORK(&sd->work, sbp2_reconnect, unit);
+ schedule_work(&sd->work);
+}
+
+#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
+#define SBP2_SW_VERSION_ENTRY 0x00010483
+
+static struct fw_device_id sbp2_id_table[] = {
+ {
+ .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
+ .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
+ .version = SBP2_SW_VERSION_ENTRY
+ },
+ { }
+};
+
+static struct fw_driver sbp2_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = sbp2_driver_name,
+ .bus = &fw_bus_type,
+ .probe = sbp2_probe,
+ .remove = sbp2_remove,
+ },
+ .update = sbp2_update,
+ .id_table = sbp2_id_table,
+};
+
+static unsigned int sbp2_status_to_sense_data(u8 * sbp2_status, u8 * sense_data)
+{
+ sense_data[0] = 0x70;
+ sense_data[1] = 0x0;
+ sense_data[2] = sbp2_status[1];
+ sense_data[3] = sbp2_status[4];
+ sense_data[4] = sbp2_status[5];
+ sense_data[5] = sbp2_status[6];
+ sense_data[6] = sbp2_status[7];
+ sense_data[7] = 10;
+ sense_data[8] = sbp2_status[8];
+ sense_data[9] = sbp2_status[9];
+ sense_data[10] = sbp2_status[10];
+ sense_data[11] = sbp2_status[11];
+ sense_data[12] = sbp2_status[2];
+ sense_data[13] = sbp2_status[3];
+ sense_data[14] = sbp2_status[12];
+ sense_data[15] = sbp2_status[13];
+
+ switch (sbp2_status[0] & 0x3f) {
+ case SAM_STAT_GOOD:
+ return DID_OK;
+
+ case SAM_STAT_CHECK_CONDITION:
+ /* return CHECK_CONDITION << 1 | DID_OK << 16; */
+ return DID_OK;
+
+ case SAM_STAT_BUSY:
+ return DID_BUS_BUSY;
+
+ case SAM_STAT_CONDITION_MET:
+ case SAM_STAT_RESERVATION_CONFLICT:
+ case SAM_STAT_COMMAND_TERMINATED:
+ default:
+ return DID_ERROR;
+ }
+}
+
+static void
+complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
+{
+ struct sbp2_command_orb *orb = (struct sbp2_command_orb *)base_orb;
+ struct fw_unit *unit = orb->unit;
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct scatterlist *sg;
+ int result;
+
+ if (status != NULL) {
+ if (status->dead) {
+ fw_notify("agent died, issuing agent reset\n");
+ sbp2_agent_reset(unit);
+ }
+
+ switch (status->response) {
+ case SBP2_STATUS_REQUEST_COMPLETE:
+ result = DID_OK;
+ break;
+ case SBP2_STATUS_TRANSPORT_FAILURE:
+ result = DID_BUS_BUSY;
+ break;
+ case SBP2_STATUS_ILLEGAL_REQUEST:
+ case SBP2_STATUS_VENDOR_DEPENDENT:
+ default:
+ result = DID_ERROR;
+ break;
+ }
+
+ if (result == DID_OK && status->len > 1)
+ result = sbp2_status_to_sense_data(status->data,
+ orb->cmd->sense_buffer);
+ } else {
+ /* If the orb completes with status == NULL, something
+ * went wrong, typically a bus reset happened mid-orb
+ * or when sending the write (less likely). */
+ fw_notify("no command orb status, rcode=%d\n",
+ orb->base.rcode);
+ result = DID_ERROR;
+ }
+
+ dma_unmap_single(device->card->device, orb->base.request_bus,
+ sizeof orb->request, DMA_TO_DEVICE);
+
+ if (orb->cmd->use_sg > 0) {
+ sg = (struct scatterlist *)orb->cmd->request_buffer;
+ dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
+ orb->cmd->sc_data_direction);
+ }
+
+ if (orb->page_table_bus != 0)
+ dma_unmap_single(device->card->device, orb->page_table_bus,
+ sizeof orb->page_table_bus, DMA_TO_DEVICE);
+
+ if (orb->request_buffer_bus != 0)
+ dma_unmap_single(device->card->device, orb->request_buffer_bus,
+ sizeof orb->request_buffer_bus,
+ DMA_FROM_DEVICE);
+
+ orb->cmd->result = result << 16;
+ orb->done(orb->cmd);
+
+ kfree(orb);
+}
+
+static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
+{
+ struct fw_unit *unit =
+ (struct fw_unit *)orb->cmd->device->host->hostdata[0];
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ struct scatterlist *sg;
+ int sg_len, l, i, j, count;
+ size_t size;
+ dma_addr_t sg_addr;
+
+ sg = (struct scatterlist *)orb->cmd->request_buffer;
+ count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
+ orb->cmd->sc_data_direction);
+
+ /* Handle the special case where there is only one element in
+ * the scatter list by converting it to an immediate block
+ * request. This is also a workaround for broken devices such
+ * as the second generation iPod which doesn't support page
+ * tables. */
+ if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
+ orb->request.data_descriptor_high = sd->address_high;
+ orb->request.data_descriptor_low = sg_dma_address(sg);
+ orb->request.page_table_present = 0;
+ orb->request.data_size = sg_dma_len(sg);
+ return;
+ }
+
+ /* Convert the scatterlist to an sbp2 page table. If any
+ * scatterlist entries are too big for sbp2 we split the as we go. */
+ for (i = 0, j = 0; i < count; i++) {
+ sg_len = sg_dma_len(sg + i);
+ sg_addr = sg_dma_address(sg + i);
+ while (sg_len) {
+ l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
+ orb->page_table[j].segment_base_low = sg_addr;
+ orb->page_table[j].segment_base_high = 0;
+ orb->page_table[j].length = l;
+ sg_addr += l;
+ sg_len -= l;
+ j++;
+ }
+ }
+
+ size = sizeof orb->page_table[0] * j;
+
+ /* The data_descriptor pointer is the one case where we need
+ * to fill in the node ID part of the address. All other
+ * pointers assume that the data referenced reside on the
+ * initiator (i.e. us), but data_descriptor can refer to data
+ * on other nodes so we need to put our ID in descriptor_high. */
+
+ orb->page_table_bus =
+ dma_map_single(device->card->device, orb->page_table,
+ size, DMA_TO_DEVICE);
+ orb->request.data_descriptor_high = sd->address_high;
+ orb->request.data_descriptor_low = orb->page_table_bus;
+ orb->request.page_table_present = 1;
+ orb->request.data_size = j;
+
+ fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
+}
+
+static void sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb)
+{
+ struct fw_unit *unit =
+ (struct fw_unit *)orb->cmd->device->host->hostdata[0];
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+
+ /* As for map_scatterlist, we need to fill in the high bits of
+ * the data_descriptor pointer. */
+
+ orb->request_buffer_bus =
+ dma_map_single(device->card->device,
+ orb->cmd->request_buffer,
+ orb->cmd->request_bufflen,
+ orb->cmd->sc_data_direction);
+ orb->request.data_descriptor_high = sd->address_high;
+ orb->request.data_descriptor_low = orb->request_buffer_bus;
+ orb->request.page_table_present = 0;
+ orb->request.data_size = orb->cmd->request_bufflen;
+}
+
+static void sbp2_send_command_orb(struct scsi_cmnd *cmd, scsi_done_fn_t done)
+{
+ struct fw_unit *unit = (struct fw_unit *)cmd->device->host->hostdata[0];
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_device *sd = unit->device.driver_data;
+ struct sbp2_command_orb *orb;
+
+ orb = kzalloc(sizeof *orb, GFP_ATOMIC);
+ if (orb == NULL) {
+ fw_notify("failed to alloc orb\n");
+ cmd->result = DID_NO_CONNECT << 16;
+ done(cmd);
+ return;
+ }
+
+ orb->base.request_bus =
+ dma_map_single(device->card->device, &orb->request,
+ sizeof orb->request, DMA_TO_DEVICE);
+
+ orb->unit = unit;
+ orb->done = done;
+ orb->cmd = cmd;
+
+ orb->request.next_high = SBP2_ORB_NULL;
+ orb->request.next_low = 0x0;
+ /* FIXME: Calculate real payload here. */
+ orb->request.max_payload = 12; /* 2 ^ (12 + 2) = 4096 */
+ orb->request.speed = device->node->max_speed;
+ orb->request.notify = 1;
+
+ if (cmd->sc_data_direction == DMA_FROM_DEVICE)
+ orb->request.direction = SBP2_DIRECTION_FROM_MEDIA;
+ else if (cmd->sc_data_direction == DMA_TO_DEVICE)
+ orb->request.direction = SBP2_DIRECTION_TO_MEDIA;
+
+ if (cmd->use_sg) {
+ sbp2_command_orb_map_scatterlist(orb);
+ } else if (cmd->request_bufflen > SBP2_MAX_SG_ELEMENT_LENGTH) {
+ /* FIXME: Need to split this into a sg list... but
+ * could we get the scsi or blk layer to do that by
+ * reporting our max supported block size? */
+ fw_error("command > 64k\n");
+ cmd->result = DID_ERROR << 16;
+ done(cmd);
+ return;
+ } else if (cmd->request_bufflen > 0) {
+ sbp2_command_orb_map_buffer(orb);
+ }
+
+ fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
+
+ memset(orb->request.command_block,
+ 0, sizeof orb->request.command_block);
+ memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
+
+ orb->base.callback = complete_command_orb;
+
+ sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
+ sd->command_block_agent_address + SBP2_ORB_POINTER);
+}
+
+/* SCSI stack integration */
+
+static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
+{
+ if (cmd->cmnd[0] == REQUEST_SENSE) {
+ fw_notify("request_sense");
+ memcpy(cmd->request_buffer, cmd->sense_buffer, cmd->request_bufflen);
+ memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
+ cmd->result = DID_OK << 16;
+ done(cmd);
+ return 0;
+ }
+
+ /* Bidirectional commands are not yet implemented, and unknown
+ * transfer direction not handled. */
+ if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
+ fw_error("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
+ cmd->result = DID_ERROR << 16;
+ done(cmd);
+ return 0;
+ }
+
+ sbp2_send_command_orb(cmd, done);
+
+ return 0;
+}
+
+static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
+{
+ struct fw_unit *unit = (struct fw_unit *)sdev->host->hostdata[0];
+ struct sbp2_device *sd = unit->device.driver_data;
+
+ if (sdev->type == TYPE_DISK &&
+ sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
+ sdev->skip_ms_page_8 = 1;
+ if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
+ fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
+ sdev->fix_capacity = 1;
+ }
+
+ return 0;
+}
+
+/*
+ * Called by scsi stack when something has really gone wrong. Usually
+ * called when a command has timed-out for some reason.
+ */
+static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
+{
+ struct fw_unit *unit = (struct fw_unit *)cmd->device->host->hostdata[0];
+
+ fw_notify("sbp2_scsi_abort\n");
+
+ sbp2_cancel_orbs(unit);
+
+ return SUCCESS;
+}
+
+static struct scsi_host_template scsi_driver_template = {
+ .module = THIS_MODULE,
+ .name = "SBP-2 IEEE-1394",
+ .proc_name = (char *)sbp2_driver_name,
+ .queuecommand = sbp2_scsi_queuecommand,
+ .slave_configure = sbp2_scsi_slave_configure,
+ .eh_abort_handler = sbp2_scsi_abort,
+ .this_id = -1,
+ .sg_tablesize = SG_ALL,
+ .use_clustering = ENABLE_CLUSTERING,
+ .cmd_per_lun = 1, /* SBP2_MAX_CMDS, */
+ .can_queue = 1, /* SBP2_MAX_CMDS, */
+ .emulated = 1,
+};
+
+static int add_scsi_devices(struct fw_unit *unit)
+{
+ struct sbp2_device *sd = unit->device.driver_data;
+ int retval, lun;
+
+ sd->scsi_host = scsi_host_alloc(&scsi_driver_template,
+ sizeof(unsigned long));
+ if (sd->scsi_host == NULL) {
+ fw_error("failed to register scsi host\n");
+ return -1;
+ }
+
+ sd->scsi_host->hostdata[0] = (unsigned long)unit;
+ retval = scsi_add_host(sd->scsi_host, &unit->device);
+ if (retval < 0) {
+ fw_error("failed to add scsi host\n");
+ scsi_host_put(sd->scsi_host);
+ return retval;
+ }
+
+ /* FIXME: Loop over luns here. */
+ lun = 0;
+ retval = scsi_add_device(sd->scsi_host, 0, 0, lun);
+ if (retval < 0) {
+ fw_error("failed to add scsi device\n");
+ scsi_remove_host(sd->scsi_host);
+ scsi_host_put(sd->scsi_host);
+ return retval;
+ }
+
+ return 0;
+}
+
+static void remove_scsi_devices(struct fw_unit *unit)
+{
+ struct sbp2_device *sd = unit->device.driver_data;
+
+ scsi_remove_host(sd->scsi_host);
+ scsi_host_put(sd->scsi_host);
+}
+
+MODULE_AUTHOR("Kristian Høgsberg <krh@bitplanet.net>");
+MODULE_DESCRIPTION("SCSI over IEEE1394");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
+
+static int __init sbp2_init(void)
+{
+ int retval;
+
+ retval = driver_register(&sbp2_driver.driver);
+ if (retval) {
+ fw_error("Failed to load fw-sbp2 driver.\n");
+ return retval;
+ }
+
+ fw_notify("Loaded fw-sbp2 driver.\n");
+
+ return 0;
+}
+
+static void __exit sbp2_cleanup(void)
+{
+ driver_unregister(&sbp2_driver.driver);
+
+ fw_notify("Unloaded fw-sbp2 driver.\n");
+}
+
+module_init(sbp2_init);
+module_exit(sbp2_cleanup);