diff options
| -rw-r--r-- | drivers/firewire/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/firewire/Makefile | 1 | ||||
| -rw-r--r-- | drivers/firewire/fw-sbp2.c | 1073 |
3 files changed, 1086 insertions, 0 deletions
diff --git a/drivers/firewire/Kconfig b/drivers/firewire/Kconfig index b3863344617..bfab4b32cdc 100644 --- a/drivers/firewire/Kconfig +++ b/drivers/firewire/Kconfig @@ -31,4 +31,16 @@ config FW_OHCI To compile this driver as a module, say M here: the module will be called fw-ohci. +config FW_SBP2 + tristate "Support for storage devices (SBP-2 protocol driver)" + depends on FW && SCSI + help + This option enables you to use SBP-2 devices connected to an + firewire bus. SBP-2 devices include storage devices like + harddisks and DVD drives, also some other FireWire devices + like scanners. + + You should also enable support for disks, CD-ROMs, etc. in the SCSI + configuration section. + endmenu diff --git a/drivers/firewire/Makefile b/drivers/firewire/Makefile index add3b983def..b955c999854 100644 --- a/drivers/firewire/Makefile +++ b/drivers/firewire/Makefile @@ -7,3 +7,4 @@ fw-core-objs := fw-card.o fw-topology.o fw-transaction.o fw-iso.o \ obj-$(CONFIG_FW) += fw-core.o obj-$(CONFIG_FW_OHCI) += fw-ohci.o +obj-$(CONFIG_FW_SBP2) += fw-sbp2.o
\ No newline at end of file diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c new file mode 100644 index 00000000000..2756e0c2f9c --- /dev/null +++ b/drivers/firewire/fw-sbp2.c @@ -0,0 +1,1073 @@ +/* -*- c-basic-offset: 8 -*- + * fw-sbp2.c -- SBP2 driver (SCSI over IEEE1394) + * + * 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/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_unit *unit; + 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 + +#define status_get_orb_high(v) ((v).status & 0xffff) +#define status_get_sbp_status(v) (((v).status >> 16) & 0xff) +#define status_get_len(v) (((v).status >> 24) & 0x07) +#define status_get_dead(v) (((v).status >> 27) & 0x01) +#define status_get_response(v) (((v).status >> 28) & 0x03) +#define status_get_source(v) (((v).status >> 30) & 0x03) +#define status_get_orb_low(v) ((v).orb_low) +#define status_get_data(v) ((v).data) + +struct sbp2_status { + u32 status; + u32 orb_low; + u8 data[24]; +}; + +struct sbp2_pointer { + u32 high; + u32 low; +}; + +struct sbp2_orb { + struct fw_transaction t; + dma_addr_t request_bus; + int rcode; + struct sbp2_pointer pointer; + void (*callback) (struct sbp2_orb * orb, struct sbp2_status * status); + struct list_head link; +}; + +#define management_orb_lun(v) ((v)) +#define management_orb_function(v) ((v) << 16) +#define management_orb_reconnect(v) ((v) << 20) +#define management_orb_exclusive ((1) << 28) +#define management_orb_request_format(v) ((v) << 29) +#define management_orb_notify ((1) << 31) + +#define management_orb_response_length(v) ((v)) +#define management_orb_password_length(v) ((v) << 16) + +struct sbp2_management_orb { + struct sbp2_orb base; + struct { + struct sbp2_pointer password; + struct sbp2_pointer response; + u32 misc; + u32 length; + struct sbp2_pointer status_fifo; + } request; + __be32 response[4]; + dma_addr_t response_bus; + struct completion done; + struct sbp2_status status; +}; + +#define login_response_get_login_id(v) ((v).misc & 0xffff) +#define login_response_get_length(v) (((v).misc >> 16) & 0xffff) + +struct sbp2_login_response { + u32 misc; + struct sbp2_pointer command_block_agent; + u32 reconnect_hold; +}; + +#define command_orb_data_size(v) ((v)) +#define command_orb_page_size(v) ((v) << 16) +#define command_orb_page_table_present ((1) << 19) +#define command_orb_max_payload(v) ((v) << 20) +#define command_orb_speed(v) ((v) << 24) +#define command_orb_direction(v) ((v) << 27) +#define command_orb_request_format(v) ((v) << 29) +#define command_orb_notify ((1) << 31) + +struct sbp2_command_orb { + struct sbp2_orb base; + struct { + struct sbp2_pointer next; + struct sbp2_pointer data_descriptor; + u32 misc; + u8 command_block[12]; + } request; + struct scsi_cmnd *cmd; + scsi_done_fn_t done; + struct fw_unit *unit; + + struct sbp2_pointer 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, + }, + /* There are iPods (2nd gen, 3rd gen) with model_id == 0, but + * 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, + void *payload, size_t length, void *callback_data) +{ + struct sbp2_device *sd = callback_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 + 8, length - header_size); + if (status_get_source(status) == 2 || status_get_source(status) == 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_get_orb_high(status) == 0 && + status_get_orb_low(status) == 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, + void *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.high = 0; + orb->pointer.low = 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 = -ENOMEM; + + 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); + if (orb->base.request_bus == 0) + goto out; + + orb->response_bus = + dma_map_single(device->card->device, &orb->response, + sizeof orb->response, DMA_FROM_DEVICE); + if (orb->response_bus == 0) + goto out; + + orb->request.response.high = 0; + orb->request.response.low = orb->response_bus; + + orb->request.misc = + management_orb_notify | + management_orb_function(function) | + management_orb_lun(lun); + orb->request.length = + management_orb_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.misc |= + management_orb_exclusive | + management_orb_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. */ + + retval = -EIO; + 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 (status_get_response(orb->status) != 0 || + status_get_sbp_status(orb->status) != 0) { + fw_error("error status: %d:%d\n", + status_get_response(orb->status), + status_get_sbp_status(orb->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, + void *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; + sd->unit = unit; + INIT_LIST_HEAD(&sd->orb_list); + + sd->address_handler.length = 0x100; + sd->address_handler.address_callback = sbp2_status_write; + sd->address_handler.callback_data = sd; + + 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 && + sbp2_workarounds_table[i].model != ~0) + 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 = login_response_get_login_id(response); + + fw_notify("logged in to sbp2 unit %s\n", unit->device.bus_id); + fw_notify(" - management_agent_address: 0x%012llx\n", + (unsigned long long) sd->management_agent_address); + fw_notify(" - command_block_agent_address: 0x%012llx\n", + (unsigned long long) sd->command_block_agent_address); + fw_notify(" - status write address: 0x%012llx\n", + (unsigned long long) sd->address_handler.offset); + +#if 0 + /* FIXME: The linux1394 sbp2 does this last step. */ + sbp2_set_busy_timeout(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(struct work_struct *work) +{ + struct sbp2_device *sd = container_of(work, struct sbp2_device, work); + struct fw_unit *unit = sd->unit; + struct fw_device *device = fw_device(unit->device.parent); + 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); + 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_get_dead(*status)) { + fw_notify("agent died, issuing agent reset\n"); + sbp2_agent_reset(unit); + } + + switch (status_get_response(*status)) { + 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_get_len(*status) > 1) + result = sbp2_status_to_sense_data(status_get_data(*status), + 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.misc |= + command_orb_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].low = sg_addr; + orb->page_table[j].high = (l << 16); + 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.misc |= + command_orb_page_table_present | + command_orb_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.misc |= + command_orb_data_size(orb->cmd->request_bufflen); +} + +/* SCSI stack integration */ + +static int sbp2_scsi_queuecommand(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; + + /* 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; + } + + 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 0; + } + + 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; + /* At speed 100 we can do 512 bytes per packet, at speed 200, + * 1024 bytes per packet etc. The SBP-2 max_payload field + * specifies the max payload size as 2 ^ (max_payload + 2), so + * if we set this to max_speed + 7, we get the right value. */ + orb->request.misc = + command_orb_max_payload(device->node->max_speed + 7) | + command_orb_speed(device->node->max_speed) | + command_orb_notify; + + if (cmd->sc_data_direction == DMA_FROM_DEVICE) + orb->request.misc |= + command_orb_direction(SBP2_DIRECTION_FROM_MEDIA); + else if (cmd->sc_data_direction == DMA_TO_DEVICE) + orb->request.misc |= + command_orb_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 0; + } 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); + + 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 Hoegsberg <krh@bitplanet.net>"); +MODULE_DESCRIPTION("SCSI over IEEE1394"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); + +static int __init sbp2_init(void) +{ + return driver_register(&sbp2_driver.driver); +} + +static void __exit sbp2_cleanup(void) +{ + driver_unregister(&sbp2_driver.driver); +} + +module_init(sbp2_init); +module_exit(sbp2_cleanup); |