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linux-sg2042/drivers/ide/ide-atapi.c

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/*
* 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
/* TODO: unify the code thus making some arguments go away */
ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
{
ide_hwif_t *hwif = drive->hwif;
xfer_func_t *xferfunc;
unsigned int temp;
u16 bcount;
u8 stat, ireason, scsi = drive->scsi;
debug_log("Enter %s - interrupt handler\n", __func__);
if (pc->flags & PC_FLAG_TIMEDOUT) {
pc->callback(drive);
return ide_stopped;
}
/* Clear the interrupt */
stat = hwif->read_status(hwif);
if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
if (hwif->dma_ops->dma_end(drive) ||
(drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
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 (update_buffers)
update_buffers(drive, pc);
}
debug_log("%s: DMA finished\n", drive->name);
}
/* No more interrupts */
if ((stat & DRQ_STAT) == 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 & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
stat &= ~ERR_STAT;
if ((stat & ERR_STAT) || (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 (pc->c[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", pc->c[0]);
/* Retry operation */
retry_pc(drive);
/* queued, but not started */
return ide_stopped;
}
cmd_finished:
pc->error = 0;
if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
(stat & SEEK_STAT) == 0) {
dsc_handle(drive);
return ide_stopped;
}
/* Command finished - Call the callback function */
pc->callback(drive);
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 & CD) {
printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
return ide_do_reset(drive);
}
if (((ireason & IO) == 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 & IO) ? "Write" : "Read",
(ireason & 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)
io_buffers(drive, pc, temp, 0);
else
hwif->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);
ide_set_handler(drive, handler, timeout,
expiry);
return ide_started;
}
debug_log("The device wants to send us more data than "
"expected - allowing transfer\n");
}
xferfunc = hwif->input_data;
} else
xferfunc = hwif->output_data;
if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
(drive->media == ide_tape && !scsi && pc->bh) ||
(scsi && pc->sg))
io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
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",
pc->c[0], bcount);
/* And set the interrupt handler again */
ide_set_handler(drive, handler, timeout, expiry);
return ide_started;
}
EXPORT_SYMBOL_GPL(ide_pc_intr);
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->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 & CD) == 0 || (ireason & 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 |= 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 = ide_read_ireason(drive);
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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