6bf1641ca1
Add generic ide_issue_pc() helper to ide-atapi.c and then
convert ide-{floppy,tape,scsi} device drivers to use it.
There should be no functional changes caused by this patch.
Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
119 lines
2.9 KiB
C
119 lines
2.9 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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static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
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{
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ide_hwif_t *hwif = drive->hwif;
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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 = hwif->INB(hwif->io_ports.nsect_addr);
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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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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 = hwif->INB(hwif->io_ports.nsect_addr);
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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 ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
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hwif->output_data(drive, NULL, pc->c, 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 (pc->flags & PC_FLAG_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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