![Borislav Petkov](/assets/img/avatar_default.png)
There should be no functionality change resulting from this patch. Signed-off-by: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
315 lines
8.1 KiB
C
315 lines
8.1 KiB
C
/*
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* ATAPI support.
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ide.h>
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#include <scsi/scsi.h>
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#ifdef DEBUG
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#define debug_log(fmt, args...) \
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printk(KERN_INFO "ide: " fmt, ## args)
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#else
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#define debug_log(fmt, args...) do {} while (0)
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#endif
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/* TODO: unify the code thus making some arguments go away */
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ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
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ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
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void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
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void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
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void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
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{
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ide_hwif_t *hwif = drive->hwif;
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struct request *rq = hwif->hwgroup->rq;
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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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xfer_func_t *xferfunc;
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unsigned int temp;
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u16 bcount;
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u8 stat, ireason, scsi = drive->scsi;
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debug_log("Enter %s - interrupt handler\n", __func__);
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if (pc->flags & PC_FLAG_TIMEDOUT) {
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drive->pc_callback(drive);
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return ide_stopped;
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}
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/* Clear the interrupt */
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stat = tp_ops->read_status(hwif);
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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if (hwif->dma_ops->dma_end(drive) ||
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(drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
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if (drive->media == ide_floppy && !scsi)
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printk(KERN_ERR "%s: DMA %s error\n",
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drive->name, rq_data_dir(pc->rq)
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? "write" : "read");
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pc->flags |= PC_FLAG_DMA_ERROR;
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} else {
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pc->xferred = pc->req_xfer;
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if (update_buffers)
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update_buffers(drive, pc);
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}
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debug_log("%s: DMA finished\n", drive->name);
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}
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/* No more interrupts */
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if ((stat & DRQ_STAT) == 0) {
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debug_log("Packet command completed, %d bytes transferred\n",
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pc->xferred);
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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local_irq_enable_in_hardirq();
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if (drive->media == ide_tape && !scsi &&
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(stat & ERR_STAT) && rq->cmd[0] == REQUEST_SENSE)
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stat &= ~ERR_STAT;
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if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
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/* Error detected */
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debug_log("%s: I/O error\n", drive->name);
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if (drive->media != ide_tape || scsi) {
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pc->rq->errors++;
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if (scsi)
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goto cmd_finished;
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}
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if (rq->cmd[0] == REQUEST_SENSE) {
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printk(KERN_ERR "%s: I/O error in request sense"
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" command\n", drive->name);
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return ide_do_reset(drive);
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}
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debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
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/* Retry operation */
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retry_pc(drive);
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/* queued, but not started */
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return ide_stopped;
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}
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cmd_finished:
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pc->error = 0;
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if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
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(stat & SEEK_STAT) == 0) {
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dsc_handle(drive);
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return ide_stopped;
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}
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/* Command finished - Call the callback function */
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drive->pc_callback(drive);
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return ide_stopped;
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}
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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printk(KERN_ERR "%s: The device wants to issue more interrupts "
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"in DMA mode\n", drive->name);
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ide_dma_off(drive);
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return ide_do_reset(drive);
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}
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/* Get the number of bytes to transfer on this interrupt. */
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ide_read_bcount_and_ireason(drive, &bcount, &ireason);
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if (ireason & CD) {
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printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
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return ide_do_reset(drive);
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}
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if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
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/* Hopefully, we will never get here */
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printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
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"to %s!\n", drive->name,
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(ireason & IO) ? "Write" : "Read",
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(ireason & IO) ? "Read" : "Write");
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return ide_do_reset(drive);
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}
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if (!(pc->flags & PC_FLAG_WRITING)) {
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/* Reading - Check that we have enough space */
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temp = pc->xferred + bcount;
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if (temp > pc->req_xfer) {
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if (temp > pc->buf_size) {
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printk(KERN_ERR "%s: The device wants to send "
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"us more data than expected - "
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"discarding data\n",
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drive->name);
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if (scsi)
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temp = pc->buf_size - pc->xferred;
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else
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temp = 0;
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if (temp) {
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if (pc->sg)
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io_buffers(drive, pc, temp, 0);
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else
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tp_ops->input_data(drive, NULL,
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pc->cur_pos, temp);
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printk(KERN_ERR "%s: transferred %d of "
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"%d bytes\n",
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drive->name,
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temp, bcount);
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}
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pc->xferred += temp;
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pc->cur_pos += temp;
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ide_pad_transfer(drive, 0, bcount - temp);
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ide_set_handler(drive, handler, timeout,
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expiry);
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return ide_started;
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}
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debug_log("The device wants to send us more data than "
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"expected - allowing transfer\n");
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}
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xferfunc = tp_ops->input_data;
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} else
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xferfunc = tp_ops->output_data;
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if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
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(drive->media == ide_tape && !scsi && pc->bh) ||
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(scsi && pc->sg))
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io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
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else
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xferfunc(drive, NULL, pc->cur_pos, bcount);
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/* Update the current position */
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pc->xferred += bcount;
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pc->cur_pos += bcount;
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debug_log("[cmd %x] transferred %d bytes on that intr.\n",
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rq->cmd[0], bcount);
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/* And set the interrupt handler again */
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ide_set_handler(drive, handler, timeout, expiry);
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return ide_started;
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}
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EXPORT_SYMBOL_GPL(ide_pc_intr);
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static u8 ide_read_ireason(ide_drive_t *drive)
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{
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ide_task_t task;
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memset(&task, 0, sizeof(task));
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task.tf_flags = IDE_TFLAG_IN_NSECT;
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drive->hwif->tp_ops->tf_read(drive, &task);
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return task.tf.nsect & 3;
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}
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static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
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{
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int retries = 100;
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while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
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printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
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"a packet command, retrying\n", drive->name);
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udelay(100);
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ireason = ide_read_ireason(drive);
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if (retries == 0) {
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printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
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"a packet command, ignoring\n",
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drive->name);
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ireason |= CD;
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ireason &= ~IO;
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}
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}
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return ireason;
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}
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ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
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ide_handler_t *handler, unsigned int timeout,
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ide_expiry_t *expiry)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct request *rq = hwif->hwgroup->rq;
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ide_startstop_t startstop;
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u8 ireason;
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if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
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printk(KERN_ERR "%s: Strange, packet command initiated yet "
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"DRQ isn't asserted\n", drive->name);
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return startstop;
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}
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ireason = ide_read_ireason(drive);
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if (drive->media == ide_tape && !drive->scsi)
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ireason = ide_wait_ireason(drive, ireason);
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if ((ireason & CD) == 0 || (ireason & IO)) {
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printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
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"a packet command\n", drive->name);
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return ide_do_reset(drive);
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}
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/* Set the interrupt routine */
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ide_set_handler(drive, handler, timeout, expiry);
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/* Begin DMA, if necessary */
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if (pc->flags & PC_FLAG_DMA_OK) {
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pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
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hwif->dma_ops->dma_start(drive);
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}
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/* Send the actual packet */
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if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
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hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
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return ide_started;
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}
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EXPORT_SYMBOL_GPL(ide_transfer_pc);
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ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
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ide_handler_t *handler, unsigned int timeout,
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ide_expiry_t *expiry)
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{
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ide_hwif_t *hwif = drive->hwif;
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u16 bcount;
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u8 dma = 0;
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/* We haven't transferred any data yet */
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pc->xferred = 0;
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pc->cur_pos = pc->buf;
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/* Request to transfer the entire buffer at once */
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if (drive->media == ide_tape && !drive->scsi)
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bcount = pc->req_xfer;
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else
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bcount = min(pc->req_xfer, 63 * 1024);
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if (pc->flags & PC_FLAG_DMA_ERROR) {
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pc->flags &= ~PC_FLAG_DMA_ERROR;
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ide_dma_off(drive);
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}
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if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
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if (drive->scsi)
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hwif->sg_mapped = 1;
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dma = !hwif->dma_ops->dma_setup(drive);
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if (drive->scsi)
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hwif->sg_mapped = 0;
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}
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if (!dma)
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pc->flags &= ~PC_FLAG_DMA_OK;
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ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
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bcount, dma);
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/* Issue the packet command */
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if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
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ide_execute_command(drive, WIN_PACKETCMD, handler,
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timeout, NULL);
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return ide_started;
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} else {
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ide_execute_pkt_cmd(drive);
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return (*handler)(drive);
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}
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}
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EXPORT_SYMBOL_GPL(ide_issue_pc);
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