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/*
* ATAPI support.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ide.h>
static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
{
ide_hwif_t *hwif = drive->hwif;
int retries = 100;
while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, retrying\n", drive->name);
udelay(100);
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (retries == 0) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, ignoring\n",
drive->name);
ireason |= CD;
ireason &= ~IO;
}
}
return ireason;
}
ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
ide_hwif_t *hwif = drive->hwif;
ide_startstop_t startstop;
u8 ireason;
if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (drive->media == ide_tape && !drive->scsi)
ireason = ide_wait_ireason(drive, ireason);
if ((ireason & CD) == 0 || (ireason & IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
return ide_do_reset(drive);
}
/* Set the interrupt routine */
ide_set_handler(drive, handler, 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 ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
hwif->output_data(drive, NULL, pc->c, 12);
return ide_started;
}
EXPORT_SYMBOL_GPL(ide_transfer_pc);
ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
ide_hwif_t *hwif = drive->hwif;
u16 bcount;
u8 dma = 0;
/* 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 && !drive->scsi)
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->using_dma) {
if (drive->scsi)
hwif->sg_mapped = 1;
dma = !hwif->dma_ops->dma_setup(drive);
if (drive->scsi)
hwif->sg_mapped = 0;
}
if (!dma)
pc->flags &= ~PC_FLAG_DMA_OK;
ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
bcount, dma);
/* Issue the packet command */
if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
ide_execute_command(drive, WIN_PACKETCMD, handler,
timeout, NULL);
return ide_started;
} else {
ide_execute_pkt_cmd(drive);
return (*handler)(drive);
}
}
EXPORT_SYMBOL_GPL(ide_issue_pc);
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