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path: root/drivers/ide/ide-atapi.c
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Diffstat (limited to 'drivers/ide/ide-atapi.c')
-rw-r--r--drivers/ide/ide-atapi.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
new file mode 100644
index 000000000000..2802031de670
--- /dev/null
+++ b/drivers/ide/ide-atapi.c
@@ -0,0 +1,296 @@
+/*
+ * 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 = ide_read_status(drive);
+
+ 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. */
+ bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
+ hwif->INB(hwif->io_ports.lbam_addr);
+
+ ireason = hwif->INB(hwif->io_ports.nsect_addr);
+
+ 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_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);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-23 21:47:23 +0300