diff options
Diffstat (limited to 'drivers/firewire/fw-sbp2.c')
| -rw-r--r-- | drivers/firewire/fw-sbp2.c | 101 |
1 files changed, 66 insertions, 35 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index 7ce9b811431..eb3bddb162e 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -1,5 +1,5 @@ -/* -*- c-basic-offset: 8 -*- - * fw-spb2.c -- SBP2 driver (SCSI over IEEE1394) +/* + * SBP2 driver (SCSI over IEEE1394) * * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> * @@ -18,7 +18,8 @@ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -/* The basic structure of this driver is based the old storage driver, +/* + * The basic structure of this driver is based on the old storage driver, * drivers/ieee1394/sbp2.c, originally written by * James Goodwin <jamesg@filanet.com> * with later contributions and ongoing maintenance from @@ -60,11 +61,13 @@ struct sbp2_device { u32 workarounds; int login_id; - /* We cache these addresses and only update them once we've + /* + * 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). */ + * handle it (e.g. after a bus reset but before we reconnect). + */ int node_id; int address_high; int generation; @@ -239,10 +242,14 @@ static const struct { .model = ~0, .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, }, - /* There are iPods (2nd gen, 3rd gen) with model_id == 0, but + + /* + * 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. */ + * could change due to Apple-supplied firmware updates though. + */ + /* iPod 4th generation. */ { .firmware_revision = 0x0a2700, .model = 0x000021, @@ -398,9 +405,10 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, 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. */ + /* + * 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); @@ -426,10 +434,11 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, 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 + /* + * 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. */ + * is probably fine, but the exclusive login should be an option. + */ if (function == SBP2_LOGIN_REQUEST) { orb->request.misc |= management_orb_exclusive | @@ -592,8 +601,10 @@ static void sbp2_login(struct work_struct *work) sbp2_send_management_orb(unit, sd->node_id, sd->generation, SBP2_LOGOUT_REQUEST, sd->login_id, NULL); - /* Set this back to sbp2_login so we fall back and - * retry login on bus reset. */ + /* + * Set this back to sbp2_login so we fall back and + * retry login on bus reset. + */ PREPARE_DELAYED_WORK(&sd->work, sbp2_login); } kref_put(&sd->kref, release_sbp2_device); @@ -633,9 +644,11 @@ static int sbp2_probe(struct device *dev) return -EBUSY; } - /* Scan unit directory to get management agent address, + /* + * 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. */ + * and model to values that wont match anything in our table. + */ firmware_revision = 0xff000000; model = 0xff000000; fw_csr_iterator_init(&ci, unit->directory); @@ -673,9 +686,11 @@ static int sbp2_probe(struct device *dev) get_device(&unit->device); - /* We schedule work to do the login so we can easily + /* + * We schedule work to do the login so we can easily * reschedule retries. Always get the ref before scheduling - * work.*/ + * work. + */ INIT_DELAYED_WORK(&sd->work, sbp2_login); if (schedule_delayed_work(&sd->work, 0)) kref_get(&sd->kref); @@ -834,9 +849,11 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) result = sbp2_status_to_sense_data(status_get_data(*status), orb->cmd->sense_buffer); } else { - /* If the orb completes with status == NULL, something + /* + * If the orb completes with status == NULL, something * went wrong, typically a bus reset happened mid-orb - * or when sending the write (less likely). */ + * or when sending the write (less likely). + */ result = DID_BUS_BUSY << 16; } @@ -878,11 +895,13 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) 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 + /* + * 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. */ + * 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); @@ -891,8 +910,10 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) return; } - /* Convert the scatterlist to an sbp2 page table. If any - * scatterlist entries are too big for sbp2 we split the as we go. */ + /* + * 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); @@ -908,11 +929,13 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) size = sizeof orb->page_table[0] * j; - /* The data_descriptor pointer is the one case where we need + /* + * 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. */ + * 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, @@ -933,8 +956,10 @@ static void sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb) 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. */ + /* + * 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, @@ -956,8 +981,10 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) 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. */ + /* + * 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"); goto fail_alloc; @@ -983,10 +1010,12 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) 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, + /* + * 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. */ + * 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) | @@ -1002,9 +1031,11 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) 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 + /* + * 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? */ + * reporting our max supported block size? + */ fw_error("command > 64k\n"); goto fail_bufflen; } else if (cmd->request_bufflen > 0) { |