diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/ide/ide-taskfile.c | 668 |
1 files changed, 668 insertions, 0 deletions
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c new file mode 100644 index 000000000..c21d5c50a --- /dev/null +++ b/drivers/ide/ide-taskfile.c @@ -0,0 +1,668 @@ +/* + * Copyright (C) 2000-2002 Michael Cornwell <cornwell@acm.org> + * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org> + * Copyright (C) 2001-2002 Klaus Smolin + * IBM Storage Technology Division + * Copyright (C) 2003-2004, 2007 Bartlomiej Zolnierkiewicz + * + * The big the bad and the ugly. + */ + +#include <linux/types.h> +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/hdreg.h> +#include <linux/ide.h> +#include <linux/nmi.h> +#include <linux/scatterlist.h> +#include <linux/uaccess.h> + +#include <asm/io.h> + +void ide_tf_readback(ide_drive_t *drive, struct ide_cmd *cmd) +{ + ide_hwif_t *hwif = drive->hwif; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + + /* Be sure we're looking at the low order bytes */ + tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); + + tp_ops->tf_read(drive, &cmd->tf, cmd->valid.in.tf); + + if (cmd->tf_flags & IDE_TFLAG_LBA48) { + tp_ops->write_devctl(hwif, ATA_HOB | ATA_DEVCTL_OBS); + + tp_ops->tf_read(drive, &cmd->hob, cmd->valid.in.hob); + } +} + +void ide_tf_dump(const char *s, struct ide_cmd *cmd) +{ +#ifdef DEBUG + printk("%s: tf: feat 0x%02x nsect 0x%02x lbal 0x%02x " + "lbam 0x%02x lbah 0x%02x dev 0x%02x cmd 0x%02x\n", + s, cmd->tf.feature, cmd->tf.nsect, + cmd->tf.lbal, cmd->tf.lbam, cmd->tf.lbah, + cmd->tf.device, cmd->tf.command); + printk("%s: hob: nsect 0x%02x lbal 0x%02x lbam 0x%02x lbah 0x%02x\n", + s, cmd->hob.nsect, cmd->hob.lbal, cmd->hob.lbam, cmd->hob.lbah); +#endif +} + +int taskfile_lib_get_identify(ide_drive_t *drive, u8 *buf) +{ + struct ide_cmd cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.tf.nsect = 0x01; + if (drive->media == ide_disk) + cmd.tf.command = ATA_CMD_ID_ATA; + else + cmd.tf.command = ATA_CMD_ID_ATAPI; + cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; + cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; + cmd.protocol = ATA_PROT_PIO; + + return ide_raw_taskfile(drive, &cmd, buf, 1); +} + +static ide_startstop_t task_no_data_intr(ide_drive_t *); +static ide_startstop_t pre_task_out_intr(ide_drive_t *, struct ide_cmd *); +static ide_startstop_t task_pio_intr(ide_drive_t *); + +ide_startstop_t do_rw_taskfile(ide_drive_t *drive, struct ide_cmd *orig_cmd) +{ + ide_hwif_t *hwif = drive->hwif; + struct ide_cmd *cmd = &hwif->cmd; + struct ide_taskfile *tf = &cmd->tf; + ide_handler_t *handler = NULL; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + const struct ide_dma_ops *dma_ops = hwif->dma_ops; + + if (orig_cmd->protocol == ATA_PROT_PIO && + (orig_cmd->tf_flags & IDE_TFLAG_MULTI_PIO) && + drive->mult_count == 0) { + pr_err("%s: multimode not set!\n", drive->name); + return ide_stopped; + } + + if (orig_cmd->ftf_flags & IDE_FTFLAG_FLAGGED) + orig_cmd->ftf_flags |= IDE_FTFLAG_SET_IN_FLAGS; + + memcpy(cmd, orig_cmd, sizeof(*cmd)); + + if ((cmd->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0) { + ide_tf_dump(drive->name, cmd); + tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); + + if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) { + u8 data[2] = { cmd->tf.data, cmd->hob.data }; + + tp_ops->output_data(drive, cmd, data, 2); + } + + if (cmd->valid.out.tf & IDE_VALID_DEVICE) { + u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ? + 0xE0 : 0xEF; + + if (!(cmd->ftf_flags & IDE_FTFLAG_FLAGGED)) + cmd->tf.device &= HIHI; + cmd->tf.device |= drive->select; + } + + tp_ops->tf_load(drive, &cmd->hob, cmd->valid.out.hob); + tp_ops->tf_load(drive, &cmd->tf, cmd->valid.out.tf); + } + + switch (cmd->protocol) { + case ATA_PROT_PIO: + if (cmd->tf_flags & IDE_TFLAG_WRITE) { + tp_ops->exec_command(hwif, tf->command); + ndelay(400); /* FIXME */ + return pre_task_out_intr(drive, cmd); + } + handler = task_pio_intr; + /* fall through */ + case ATA_PROT_NODATA: + if (handler == NULL) + handler = task_no_data_intr; + ide_execute_command(drive, cmd, handler, WAIT_WORSTCASE); + return ide_started; + case ATA_PROT_DMA: + if (ide_dma_prepare(drive, cmd)) + return ide_stopped; + hwif->expiry = dma_ops->dma_timer_expiry; + ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD); + dma_ops->dma_start(drive); + /* fall through */ + default: + return ide_started; + } +} +EXPORT_SYMBOL_GPL(do_rw_taskfile); + +static ide_startstop_t task_no_data_intr(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + struct ide_cmd *cmd = &hwif->cmd; + struct ide_taskfile *tf = &cmd->tf; + int custom = (cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) ? 1 : 0; + int retries = (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) ? 5 : 1; + u8 stat; + + local_irq_enable_in_hardirq(); + + while (1) { + stat = hwif->tp_ops->read_status(hwif); + if ((stat & ATA_BUSY) == 0 || retries-- == 0) + break; + udelay(10); + }; + + if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { + if (custom && tf->command == ATA_CMD_SET_MULTI) { + drive->mult_req = drive->mult_count = 0; + drive->special_flags |= IDE_SFLAG_RECALIBRATE; + (void)ide_dump_status(drive, __func__, stat); + return ide_stopped; + } else if (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) { + if ((stat & (ATA_ERR | ATA_DRQ)) == 0) { + ide_set_handler(drive, &task_no_data_intr, + WAIT_WORSTCASE); + return ide_started; + } + } + return ide_error(drive, "task_no_data_intr", stat); + } + + if (custom && tf->command == ATA_CMD_SET_MULTI) + drive->mult_count = drive->mult_req; + + if (custom == 0 || tf->command == ATA_CMD_IDLEIMMEDIATE || + tf->command == ATA_CMD_CHK_POWER) { + struct request *rq = hwif->rq; + + if (ata_pm_request(rq)) + ide_complete_pm_rq(drive, rq); + else + ide_finish_cmd(drive, cmd, stat); + } + + return ide_stopped; +} + +static u8 wait_drive_not_busy(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + int retries; + u8 stat; + + /* + * Last sector was transferred, wait until device is ready. This can + * take up to 6 ms on some ATAPI devices, so we will wait max 10 ms. + */ + for (retries = 0; retries < 1000; retries++) { + stat = hwif->tp_ops->read_status(hwif); + + if (stat & ATA_BUSY) + udelay(10); + else + break; + } + + if (stat & ATA_BUSY) + pr_err("%s: drive still BUSY!\n", drive->name); + + return stat; +} + +void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, + unsigned int write, unsigned int len) +{ + ide_hwif_t *hwif = drive->hwif; + struct scatterlist *sg = hwif->sg_table; + struct scatterlist *cursg = cmd->cursg; + unsigned long uninitialized_var(flags); + struct page *page; + unsigned int offset; + u8 *buf; + + if (cursg == NULL) + cursg = cmd->cursg = sg; + + while (len) { + unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs); + + page = sg_page(cursg); + offset = cursg->offset + cmd->cursg_ofs; + + /* get the current page and offset */ + page = nth_page(page, (offset >> PAGE_SHIFT)); + offset %= PAGE_SIZE; + + nr_bytes = min_t(unsigned, nr_bytes, (PAGE_SIZE - offset)); + + buf = kmap_atomic(page) + offset; + + cmd->nleft -= nr_bytes; + cmd->cursg_ofs += nr_bytes; + + if (cmd->cursg_ofs == cursg->length) { + cursg = cmd->cursg = sg_next(cmd->cursg); + cmd->cursg_ofs = 0; + } + + /* do the actual data transfer */ + if (write) + hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes); + else + hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes); + + kunmap_atomic(buf); + + len -= nr_bytes; + } +} +EXPORT_SYMBOL_GPL(ide_pio_bytes); + +static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd, + unsigned int write) +{ + unsigned int nr_bytes; + + u8 saved_io_32bit = drive->io_32bit; + + if (cmd->tf_flags & IDE_TFLAG_FS) + scsi_req(cmd->rq)->result = 0; + + if (cmd->tf_flags & IDE_TFLAG_IO_16BIT) + drive->io_32bit = 0; + + touch_softlockup_watchdog(); + + if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO) + nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9); + else + nr_bytes = SECTOR_SIZE; + + ide_pio_bytes(drive, cmd, write, nr_bytes); + + drive->io_32bit = saved_io_32bit; +} + +static void ide_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd) +{ + if (cmd->tf_flags & IDE_TFLAG_FS) { + int nr_bytes = cmd->nbytes - cmd->nleft; + + if (cmd->protocol == ATA_PROT_PIO && + ((cmd->tf_flags & IDE_TFLAG_WRITE) || cmd->nleft == 0)) { + if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO) + nr_bytes -= drive->mult_count << 9; + else + nr_bytes -= SECTOR_SIZE; + } + + if (nr_bytes > 0) + ide_complete_rq(drive, BLK_STS_OK, nr_bytes); + } +} + +void ide_finish_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat) +{ + struct request *rq = drive->hwif->rq; + u8 err = ide_read_error(drive), nsect = cmd->tf.nsect; + u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER); + + ide_complete_cmd(drive, cmd, stat, err); + scsi_req(rq)->result = err; + + if (err == 0 && set_xfer) { + ide_set_xfer_rate(drive, nsect); + ide_driveid_update(drive); + } + + ide_complete_rq(drive, err ? BLK_STS_IOERR : BLK_STS_OK, blk_rq_bytes(rq)); +} + +/* + * Handler for command with PIO data phase. + */ +static ide_startstop_t task_pio_intr(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + struct ide_cmd *cmd = &drive->hwif->cmd; + u8 stat = hwif->tp_ops->read_status(hwif); + u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE); + + if (write == 0) { + /* Error? */ + if (stat & ATA_ERR) + goto out_err; + + /* Didn't want any data? Odd. */ + if ((stat & ATA_DRQ) == 0) { + /* Command all done? */ + if (OK_STAT(stat, ATA_DRDY, ATA_BUSY)) + goto out_end; + + /* Assume it was a spurious irq */ + goto out_wait; + } + } else { + if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat)) + goto out_err; + + /* Deal with unexpected ATA data phase. */ + if (((stat & ATA_DRQ) == 0) ^ (cmd->nleft == 0)) + goto out_err; + } + + if (write && cmd->nleft == 0) + goto out_end; + + /* Still data left to transfer. */ + ide_pio_datablock(drive, cmd, write); + + /* Are we done? Check status and finish transfer. */ + if (write == 0 && cmd->nleft == 0) { + stat = wait_drive_not_busy(drive); + if (!OK_STAT(stat, 0, BAD_STAT)) + goto out_err; + + goto out_end; + } +out_wait: + /* Still data left to transfer. */ + ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE); + return ide_started; +out_end: + if ((cmd->tf_flags & IDE_TFLAG_FS) == 0) + ide_finish_cmd(drive, cmd, stat); + else + ide_complete_rq(drive, BLK_STS_OK, blk_rq_sectors(cmd->rq) << 9); + return ide_stopped; +out_err: + ide_error_cmd(drive, cmd); + return ide_error(drive, __func__, stat); +} + +static ide_startstop_t pre_task_out_intr(ide_drive_t *drive, + struct ide_cmd *cmd) +{ + ide_startstop_t startstop; + + if (ide_wait_stat(&startstop, drive, ATA_DRQ, + drive->bad_wstat, WAIT_DRQ)) { + pr_err("%s: no DRQ after issuing %sWRITE%s\n", drive->name, + (cmd->tf_flags & IDE_TFLAG_MULTI_PIO) ? "MULT" : "", + (drive->dev_flags & IDE_DFLAG_LBA48) ? "_EXT" : ""); + return startstop; + } + + if (!force_irqthreads && (drive->dev_flags & IDE_DFLAG_UNMASK) == 0) + local_irq_disable(); + + ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE); + + ide_pio_datablock(drive, cmd, 1); + + return ide_started; +} + +int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf, + u16 nsect) +{ + struct request *rq; + int error; + + rq = blk_get_request(drive->queue, + (cmd->tf_flags & IDE_TFLAG_WRITE) ? + REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); + ide_req(rq)->type = ATA_PRIV_TASKFILE; + + /* + * (ks) We transfer currently only whole sectors. + * This is suffient for now. But, it would be great, + * if we would find a solution to transfer any size. + * To support special commands like READ LONG. + */ + if (nsect) { + error = blk_rq_map_kern(drive->queue, rq, buf, + nsect * SECTOR_SIZE, GFP_NOIO); + if (error) + goto put_req; + } + + rq->special = cmd; + cmd->rq = rq; + + blk_execute_rq(drive->queue, NULL, rq, 0); + error = scsi_req(rq)->result ? -EIO : 0; +put_req: + blk_put_request(rq); + return error; +} +EXPORT_SYMBOL(ide_raw_taskfile); + +int ide_no_data_taskfile(ide_drive_t *drive, struct ide_cmd *cmd) +{ + cmd->protocol = ATA_PROT_NODATA; + + return ide_raw_taskfile(drive, cmd, NULL, 0); +} +EXPORT_SYMBOL_GPL(ide_no_data_taskfile); + +#ifdef CONFIG_IDE_TASK_IOCTL +int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg) +{ + ide_task_request_t *req_task; + struct ide_cmd cmd; + u8 *outbuf = NULL; + u8 *inbuf = NULL; + u8 *data_buf = NULL; + int err = 0; + int tasksize = sizeof(struct ide_task_request_s); + unsigned int taskin = 0; + unsigned int taskout = 0; + u16 nsect = 0; + char __user *buf = (char __user *)arg; + + req_task = memdup_user(buf, tasksize); + if (IS_ERR(req_task)) + return PTR_ERR(req_task); + + taskout = req_task->out_size; + taskin = req_task->in_size; + + if (taskin > 65536 || taskout > 65536) { + err = -EINVAL; + goto abort; + } + + if (taskout) { + int outtotal = tasksize; + outbuf = kzalloc(taskout, GFP_KERNEL); + if (outbuf == NULL) { + err = -ENOMEM; + goto abort; + } + if (copy_from_user(outbuf, buf + outtotal, taskout)) { + err = -EFAULT; + goto abort; + } + } + + if (taskin) { + int intotal = tasksize + taskout; + inbuf = kzalloc(taskin, GFP_KERNEL); + if (inbuf == NULL) { + err = -ENOMEM; + goto abort; + } + if (copy_from_user(inbuf, buf + intotal, taskin)) { + err = -EFAULT; + goto abort; + } + } + + memset(&cmd, 0, sizeof(cmd)); + + memcpy(&cmd.hob, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE - 2); + memcpy(&cmd.tf, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE); + + cmd.valid.out.tf = IDE_VALID_DEVICE; + cmd.valid.in.tf = IDE_VALID_DEVICE | IDE_VALID_IN_TF; + cmd.tf_flags = IDE_TFLAG_IO_16BIT; + + if (drive->dev_flags & IDE_DFLAG_LBA48) { + cmd.tf_flags |= IDE_TFLAG_LBA48; + cmd.valid.in.hob = IDE_VALID_IN_HOB; + } + + if (req_task->out_flags.all) { + cmd.ftf_flags |= IDE_FTFLAG_FLAGGED; + + if (req_task->out_flags.b.data) + cmd.ftf_flags |= IDE_FTFLAG_OUT_DATA; + + if (req_task->out_flags.b.nsector_hob) + cmd.valid.out.hob |= IDE_VALID_NSECT; + if (req_task->out_flags.b.sector_hob) + cmd.valid.out.hob |= IDE_VALID_LBAL; + if (req_task->out_flags.b.lcyl_hob) + cmd.valid.out.hob |= IDE_VALID_LBAM; + if (req_task->out_flags.b.hcyl_hob) + cmd.valid.out.hob |= IDE_VALID_LBAH; + + if (req_task->out_flags.b.error_feature) + cmd.valid.out.tf |= IDE_VALID_FEATURE; + if (req_task->out_flags.b.nsector) + cmd.valid.out.tf |= IDE_VALID_NSECT; + if (req_task->out_flags.b.sector) + cmd.valid.out.tf |= IDE_VALID_LBAL; + if (req_task->out_flags.b.lcyl) + cmd.valid.out.tf |= IDE_VALID_LBAM; + if (req_task->out_flags.b.hcyl) + cmd.valid.out.tf |= IDE_VALID_LBAH; + } else { + cmd.valid.out.tf |= IDE_VALID_OUT_TF; + if (cmd.tf_flags & IDE_TFLAG_LBA48) + cmd.valid.out.hob |= IDE_VALID_OUT_HOB; + } + + if (req_task->in_flags.b.data) + cmd.ftf_flags |= IDE_FTFLAG_IN_DATA; + + if (req_task->req_cmd == IDE_DRIVE_TASK_RAW_WRITE) { + /* fixup data phase if needed */ + if (req_task->data_phase == TASKFILE_IN_DMAQ || + req_task->data_phase == TASKFILE_IN_DMA) + cmd.tf_flags |= IDE_TFLAG_WRITE; + } + + cmd.protocol = ATA_PROT_DMA; + + switch (req_task->data_phase) { + case TASKFILE_MULTI_OUT: + if (!drive->mult_count) { + /* (hs): give up if multcount is not set */ + pr_err("%s: %s Multimode Write multcount is not set\n", + drive->name, __func__); + err = -EPERM; + goto abort; + } + cmd.tf_flags |= IDE_TFLAG_MULTI_PIO; + /* fall through */ + case TASKFILE_OUT: + cmd.protocol = ATA_PROT_PIO; + /* fall through */ + case TASKFILE_OUT_DMAQ: + case TASKFILE_OUT_DMA: + cmd.tf_flags |= IDE_TFLAG_WRITE; + nsect = taskout / SECTOR_SIZE; + data_buf = outbuf; + break; + case TASKFILE_MULTI_IN: + if (!drive->mult_count) { + /* (hs): give up if multcount is not set */ + pr_err("%s: %s Multimode Read multcount is not set\n", + drive->name, __func__); + err = -EPERM; + goto abort; + } + cmd.tf_flags |= IDE_TFLAG_MULTI_PIO; + /* fall through */ + case TASKFILE_IN: + cmd.protocol = ATA_PROT_PIO; + /* fall through */ + case TASKFILE_IN_DMAQ: + case TASKFILE_IN_DMA: + nsect = taskin / SECTOR_SIZE; + data_buf = inbuf; + break; + case TASKFILE_NO_DATA: + cmd.protocol = ATA_PROT_NODATA; + break; + default: + err = -EFAULT; + goto abort; + } + + if (req_task->req_cmd == IDE_DRIVE_TASK_NO_DATA) + nsect = 0; + else if (!nsect) { + nsect = (cmd.hob.nsect << 8) | cmd.tf.nsect; + + if (!nsect) { + pr_err("%s: in/out command without data\n", + drive->name); + err = -EFAULT; + goto abort; + } + } + + err = ide_raw_taskfile(drive, &cmd, data_buf, nsect); + + memcpy(req_task->hob_ports, &cmd.hob, HDIO_DRIVE_HOB_HDR_SIZE - 2); + memcpy(req_task->io_ports, &cmd.tf, HDIO_DRIVE_TASK_HDR_SIZE); + + if ((cmd.ftf_flags & IDE_FTFLAG_SET_IN_FLAGS) && + req_task->in_flags.all == 0) { + req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS; + if (drive->dev_flags & IDE_DFLAG_LBA48) + req_task->in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8); + } + + if (copy_to_user(buf, req_task, tasksize)) { + err = -EFAULT; + goto abort; + } + if (taskout) { + int outtotal = tasksize; + if (copy_to_user(buf + outtotal, outbuf, taskout)) { + err = -EFAULT; + goto abort; + } + } + if (taskin) { + int intotal = tasksize + taskout; + if (copy_to_user(buf + intotal, inbuf, taskin)) { + err = -EFAULT; + goto abort; + } + } +abort: + kfree(req_task); + kfree(outbuf); + kfree(inbuf); + + return err; +} +#endif |