ide: add ide_transfer_pc() helper

* Add ide-atapi.c file for generic ATAPI support together with
  CONFIG_IDE_ATAPI config option.

* Add generic ide_transfer_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>

1 files changed, 70 insertions, 0 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
new file mode 100644
index 000000000000..25939bc60402
--- /dev/null
+++ b/drivers/ide/ide-atapi.c
@@ -0,0 +1,70 @@
+/*
+ * 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);