diff options
Diffstat (limited to 'drivers/ide/ide-atapi.c')
-rw-r--r-- | drivers/ide/ide-atapi.c | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c new file mode 100644 index 0000000..4e58b9e --- /dev/null +++ b/drivers/ide/ide-atapi.c @@ -0,0 +1,597 @@ +/* + * ATAPI support. + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/ide.h> +#include <scsi/scsi.h> + +#ifdef DEBUG +#define debug_log(fmt, args...) \ + printk(KERN_INFO "ide: " fmt, ## args) +#else +#define debug_log(fmt, args...) do {} while (0) +#endif + +/* + * Check whether we can support a device, + * based on the ATAPI IDENTIFY command results. + */ +int ide_check_atapi_device(ide_drive_t *drive, const char *s) +{ + u16 *id = drive->id; + u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; + + *((u16 *)&gcw) = id[ATA_ID_CONFIG]; + + protocol = (gcw[1] & 0xC0) >> 6; + device_type = gcw[1] & 0x1F; + removable = (gcw[0] & 0x80) >> 7; + drq_type = (gcw[0] & 0x60) >> 5; + packet_size = gcw[0] & 0x03; + +#ifdef CONFIG_PPC + /* kludge for Apple PowerBook internal zip */ + if (drive->media == ide_floppy && device_type == 5 && + !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && + strstr((char *)&id[ATA_ID_PROD], "ZIP")) + device_type = 0; +#endif + + if (protocol != 2) + printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", + s, drive->name, protocol); + else if ((drive->media == ide_floppy && device_type != 0) || + (drive->media == ide_tape && device_type != 1)) + printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", + s, drive->name, device_type); + else if (removable == 0) + printk(KERN_ERR "%s: %s: the removable flag is not set\n", + s, drive->name); + else if (drive->media == ide_floppy && drq_type == 3) + printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " + "supported\n", s, drive->name, drq_type); + else if (packet_size != 0) + printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " + "bytes\n", s, drive->name, packet_size); + else + return 1; + return 0; +} +EXPORT_SYMBOL_GPL(ide_check_atapi_device); + +/* PIO data transfer routine using the scatter gather table. */ +int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, + unsigned int bcount, int write) +{ + ide_hwif_t *hwif = drive->hwif; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data; + struct scatterlist *sg = pc->sg; + char *buf; + int count, done = 0; + + while (bcount) { + count = min(sg->length - pc->b_count, bcount); + + if (PageHighMem(sg_page(sg))) { + unsigned long flags; + + local_irq_save(flags); + buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset; + xf(drive, NULL, buf + pc->b_count, count); + kunmap_atomic(buf - sg->offset, KM_IRQ0); + local_irq_restore(flags); + } else { + buf = sg_virt(sg); + xf(drive, NULL, buf + pc->b_count, count); + } + + bcount -= count; + pc->b_count += count; + done += count; + + if (pc->b_count == sg->length) { + if (!--pc->sg_cnt) + break; + pc->sg = sg = sg_next(sg); + pc->b_count = 0; + } + } + + if (bcount) { + printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name, + bcount, write ? "padding with zeros" + : "discarding data"); + ide_pad_transfer(drive, write, bcount); + } + + return done; +} +EXPORT_SYMBOL_GPL(ide_io_buffers); + +void ide_init_pc(struct ide_atapi_pc *pc) +{ + memset(pc, 0, sizeof(*pc)); + pc->buf = pc->pc_buf; + pc->buf_size = IDE_PC_BUFFER_SIZE; +} +EXPORT_SYMBOL_GPL(ide_init_pc); + +/* + * Generate a new packet command request in front of the request queue, before + * the current request, so that it will be processed immediately, on the next + * pass through the driver. + */ +static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk, + struct ide_atapi_pc *pc, struct request *rq) +{ + blk_rq_init(NULL, rq); + rq->cmd_type = REQ_TYPE_SPECIAL; + rq->cmd_flags |= REQ_PREEMPT; + rq->buffer = (char *)pc; + rq->rq_disk = disk; + memcpy(rq->cmd, pc->c, 12); + if (drive->media == ide_tape) + rq->cmd[13] = REQ_IDETAPE_PC1; + ide_do_drive_cmd(drive, rq); +} + +/* + * Add a special packet command request to the tail of the request queue, + * and wait for it to be serviced. + */ +int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk, + struct ide_atapi_pc *pc) +{ + struct request *rq; + int error; + + rq = blk_get_request(drive->queue, READ, __GFP_WAIT); + rq->cmd_type = REQ_TYPE_SPECIAL; + rq->buffer = (char *)pc; + memcpy(rq->cmd, pc->c, 12); + if (drive->media == ide_tape) + rq->cmd[13] = REQ_IDETAPE_PC1; + error = blk_execute_rq(drive->queue, disk, rq, 0); + blk_put_request(rq); + + return error; +} +EXPORT_SYMBOL_GPL(ide_queue_pc_tail); + +int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk) +{ + struct ide_atapi_pc pc; + + ide_init_pc(&pc); + pc.c[0] = TEST_UNIT_READY; + + return ide_queue_pc_tail(drive, disk, &pc); +} +EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); + +int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start) +{ + struct ide_atapi_pc pc; + + ide_init_pc(&pc); + pc.c[0] = START_STOP; + pc.c[4] = start; + + if (drive->media == ide_tape) + pc.flags |= PC_FLAG_WAIT_FOR_DSC; + + return ide_queue_pc_tail(drive, disk, &pc); +} +EXPORT_SYMBOL_GPL(ide_do_start_stop); + +int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on) +{ + struct ide_atapi_pc pc; + + if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) + return 0; + + ide_init_pc(&pc); + pc.c[0] = ALLOW_MEDIUM_REMOVAL; + pc.c[4] = on; + + return ide_queue_pc_tail(drive, disk, &pc); +} +EXPORT_SYMBOL_GPL(ide_set_media_lock); + +void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc) +{ + ide_init_pc(pc); + pc->c[0] = REQUEST_SENSE; + if (drive->media == ide_floppy) { + pc->c[4] = 255; + pc->req_xfer = 18; + } else { + pc->c[4] = 20; + pc->req_xfer = 20; + } +} +EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd); + +/* + * Called when an error was detected during the last packet command. + * We queue a request sense packet command in the head of the request list. + */ +void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk) +{ + struct request *rq = &drive->request_sense_rq; + struct ide_atapi_pc *pc = &drive->request_sense_pc; + + (void)ide_read_error(drive); + ide_create_request_sense_cmd(drive, pc); + if (drive->media == ide_tape) + set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); + ide_queue_pc_head(drive, disk, pc, rq); +} +EXPORT_SYMBOL_GPL(ide_retry_pc); + +int ide_scsi_expiry(ide_drive_t *drive) +{ + struct ide_atapi_pc *pc = drive->pc; + + debug_log("%s called for %lu at %lu\n", __func__, + pc->scsi_cmd->serial_number, jiffies); + + pc->flags |= PC_FLAG_TIMEDOUT; + + return 0; /* we do not want the IDE subsystem to retry */ +} +EXPORT_SYMBOL_GPL(ide_scsi_expiry); + +/* + * This is the usual interrupt handler which will be called during a packet + * command. We will transfer some of the data (as requested by the drive) + * and will re-point interrupt handler to us. + */ +static ide_startstop_t ide_pc_intr(ide_drive_t *drive) +{ + struct ide_atapi_pc *pc = drive->pc; + ide_hwif_t *hwif = drive->hwif; + struct request *rq = hwif->hwgroup->rq; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + xfer_func_t *xferfunc; + ide_expiry_t *expiry; + unsigned int timeout, temp; + u16 bcount; + u8 stat, ireason, scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI), dsc = 0; + + debug_log("Enter %s - interrupt handler\n", __func__); + + if (scsi) { + timeout = ide_scsi_get_timeout(pc); + expiry = ide_scsi_expiry; + } else { + timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD + : WAIT_TAPE_CMD; + expiry = NULL; + } + + if (pc->flags & PC_FLAG_TIMEDOUT) { + drive->pc_callback(drive, 0); + return ide_stopped; + } + + /* Clear the interrupt */ + stat = tp_ops->read_status(hwif); + + if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { + if (hwif->dma_ops->dma_end(drive) || + (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) { + if (drive->media == ide_floppy && !scsi) + printk(KERN_ERR "%s: DMA %s error\n", + drive->name, rq_data_dir(pc->rq) + ? "write" : "read"); + pc->flags |= PC_FLAG_DMA_ERROR; + } else { + pc->xferred = pc->req_xfer; + if (drive->pc_update_buffers) + drive->pc_update_buffers(drive, pc); + } + debug_log("%s: DMA finished\n", drive->name); + } + + /* No more interrupts */ + if ((stat & ATA_DRQ) == 0) { + debug_log("Packet command completed, %d bytes transferred\n", + pc->xferred); + + pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; + + local_irq_enable_in_hardirq(); + + if (drive->media == ide_tape && !scsi && + (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE) + stat &= ~ATA_ERR; + + if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { + /* Error detected */ + debug_log("%s: I/O error\n", drive->name); + + if (drive->media != ide_tape || scsi) { + pc->rq->errors++; + if (scsi) + goto cmd_finished; + } + + if (rq->cmd[0] == REQUEST_SENSE) { + printk(KERN_ERR "%s: I/O error in request sense" + " command\n", drive->name); + return ide_do_reset(drive); + } + + debug_log("[cmd %x]: check condition\n", rq->cmd[0]); + + /* Retry operation */ + ide_retry_pc(drive, rq->rq_disk); + + /* queued, but not started */ + return ide_stopped; + } +cmd_finished: + pc->error = 0; + + if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0) + dsc = 1; + + /* Command finished - Call the callback function */ + drive->pc_callback(drive, dsc); + + return ide_stopped; + } + + if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { + pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; + printk(KERN_ERR "%s: The device wants to issue more interrupts " + "in DMA mode\n", drive->name); + ide_dma_off(drive); + return ide_do_reset(drive); + } + + /* Get the number of bytes to transfer on this interrupt. */ + ide_read_bcount_and_ireason(drive, &bcount, &ireason); + + if (ireason & ATAPI_COD) { + printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); + return ide_do_reset(drive); + } + + if (((ireason & ATAPI_IO) == ATAPI_IO) == + !!(pc->flags & PC_FLAG_WRITING)) { + /* Hopefully, we will never get here */ + printk(KERN_ERR "%s: We wanted to %s, but the device wants us " + "to %s!\n", drive->name, + (ireason & ATAPI_IO) ? "Write" : "Read", + (ireason & ATAPI_IO) ? "Read" : "Write"); + return ide_do_reset(drive); + } + + if (!(pc->flags & PC_FLAG_WRITING)) { + /* Reading - Check that we have enough space */ + temp = pc->xferred + bcount; + if (temp > pc->req_xfer) { + if (temp > pc->buf_size) { + printk(KERN_ERR "%s: The device wants to send " + "us more data than expected - " + "discarding data\n", + drive->name); + if (scsi) + temp = pc->buf_size - pc->xferred; + else + temp = 0; + if (temp) { + if (pc->sg) + drive->pc_io_buffers(drive, pc, + temp, 0); + else + tp_ops->input_data(drive, NULL, + pc->cur_pos, temp); + printk(KERN_ERR "%s: transferred %d of " + "%d bytes\n", + drive->name, + temp, bcount); + } + pc->xferred += temp; + pc->cur_pos += temp; + ide_pad_transfer(drive, 0, bcount - temp); + goto next_irq; + } + debug_log("The device wants to send us more data than " + "expected - allowing transfer\n"); + } + xferfunc = tp_ops->input_data; + } else + xferfunc = tp_ops->output_data; + + if ((drive->media == ide_floppy && !scsi && !pc->buf) || + (drive->media == ide_tape && !scsi && pc->bh) || + (scsi && pc->sg)) { + int done = drive->pc_io_buffers(drive, pc, bcount, + !!(pc->flags & PC_FLAG_WRITING)); + + /* FIXME: don't do partial completions */ + if (drive->media == ide_floppy && !scsi) + ide_end_request(drive, 1, done >> 9); + } else + xferfunc(drive, NULL, pc->cur_pos, bcount); + + /* Update the current position */ + pc->xferred += bcount; + pc->cur_pos += bcount; + + debug_log("[cmd %x] transferred %d bytes on that intr.\n", + rq->cmd[0], bcount); +next_irq: + /* And set the interrupt handler again */ + ide_set_handler(drive, ide_pc_intr, timeout, expiry); + return ide_started; +} + +static u8 ide_read_ireason(ide_drive_t *drive) +{ + ide_task_t task; + + memset(&task, 0, sizeof(task)); + task.tf_flags = IDE_TFLAG_IN_NSECT; + + drive->hwif->tp_ops->tf_read(drive, &task); + + return task.tf.nsect & 3; +} + +static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) +{ + int retries = 100; + + while (retries-- && ((ireason & ATAPI_COD) == 0 || + (ireason & ATAPI_IO))) { + printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " + "a packet command, retrying\n", drive->name); + udelay(100); + ireason = ide_read_ireason(drive); + if (retries == 0) { + printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " + "a packet command, ignoring\n", + drive->name); + ireason |= ATAPI_COD; + ireason &= ~ATAPI_IO; + } + } + + return ireason; +} + +static int ide_delayed_transfer_pc(ide_drive_t *drive) +{ + /* Send the actual packet */ + drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12); + + /* Timeout for the packet command */ + return WAIT_FLOPPY_CMD; +} + +static ide_startstop_t ide_transfer_pc(ide_drive_t *drive) +{ + struct ide_atapi_pc *pc = drive->pc; + ide_hwif_t *hwif = drive->hwif; + struct request *rq = hwif->hwgroup->rq; + ide_expiry_t *expiry; + unsigned int timeout; + ide_startstop_t startstop; + u8 ireason; + + if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) { + printk(KERN_ERR "%s: Strange, packet command initiated yet " + "DRQ isn't asserted\n", drive->name); + return startstop; + } + + ireason = ide_read_ireason(drive); + if (drive->media == ide_tape && + (drive->dev_flags & IDE_DFLAG_SCSI) == 0) + ireason = ide_wait_ireason(drive, ireason); + + if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) { + printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing " + "a packet command\n", drive->name); + return ide_do_reset(drive); + } + + /* + * If necessary schedule the packet transfer to occur 'timeout' + * miliseconds later in ide_delayed_transfer_pc() after the device + * says it's ready for a packet. + */ + if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) { + timeout = drive->pc_delay; + expiry = &ide_delayed_transfer_pc; + } else { + if (drive->dev_flags & IDE_DFLAG_SCSI) { + timeout = ide_scsi_get_timeout(pc); + expiry = ide_scsi_expiry; + } else { + timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD + : WAIT_TAPE_CMD; + expiry = NULL; + } + } + + /* Set the interrupt routine */ + ide_set_handler(drive, ide_pc_intr, timeout, expiry); + + /* Begin DMA, if necessary */ + if (pc->flags & PC_FLAG_DMA_OK) { + pc->flags |= PC_FLAG_DMA_IN_PROGRESS; + hwif->dma_ops->dma_start(drive); + } + + /* Send the actual packet */ + if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) + hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12); + + return ide_started; +} + +ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout, + ide_expiry_t *expiry) +{ + struct ide_atapi_pc *pc = drive->pc; + ide_hwif_t *hwif = drive->hwif; + u32 tf_flags; + u16 bcount; + u8 scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI); + + /* We haven't transferred any data yet */ + pc->xferred = 0; + pc->cur_pos = pc->buf; + + /* Request to transfer the entire buffer at once */ + if (drive->media == ide_tape && scsi == 0) + bcount = pc->req_xfer; + else + bcount = min(pc->req_xfer, 63 * 1024); + + if (pc->flags & PC_FLAG_DMA_ERROR) { + pc->flags &= ~PC_FLAG_DMA_ERROR; + ide_dma_off(drive); + } + + if ((pc->flags & PC_FLAG_DMA_OK) && + (drive->dev_flags & IDE_DFLAG_USING_DMA)) { + if (scsi) + hwif->sg_mapped = 1; + drive->dma = !hwif->dma_ops->dma_setup(drive); + if (scsi) + hwif->sg_mapped = 0; + } + + if (!drive->dma) + pc->flags &= ~PC_FLAG_DMA_OK; + + if (scsi) + tf_flags = 0; + else if (drive->media == ide_cdrom || drive->media == ide_optical) + tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL; + else + tf_flags = IDE_TFLAG_OUT_DEVICE; + + ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma); + + /* Issue the packet command */ + if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { + ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc, + timeout, NULL); + return ide_started; + } else { + ide_execute_pkt_cmd(drive); + return ide_transfer_pc(drive); + } +} +EXPORT_SYMBOL_GPL(ide_issue_pc); |