diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-15 11:15:36 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-15 11:15:36 -0700 |
commit | 98339cbd360b77c3167db287fd611468c2c44559 (patch) | |
tree | 06779e040c18aa40fc5a6e15b132fa1f70ec45f6 /drivers/ide/ide-atapi.c | |
parent | e4e0fadcd929138aa82130a1c5f22206d86d7bb2 (diff) | |
parent | cbbc4e818de4451cdef75a112b7fc8a523d5d2a0 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (80 commits)
ide-floppy: fix unfortunate function naming
ide-tape: unify idetape_create_read/write_cmd
ide: add ide_pc_intr() helper
ide-{floppy,scsi}: read Status Register before stopping DMA engine
ide-scsi: add more debugging to idescsi_pc_intr()
ide-scsi: use pc->callback
ide-floppy: add more debugging to idefloppy_pc_intr()
ide-tape: always log debug info in idetape_pc_intr() if debugging is enabled
ide-tape: add ide_tape_io_buffers() helper
ide-tape: factor out DSC handling from idetape_pc_intr()
ide-{floppy,tape}: move checking of ->failed_pc to ->callback
ide: add ide_issue_pc() helper
ide: add PC_FLAG_DRQ_INTERRUPT pc flag
ide-scsi: move idescsi_map_sg() call out from idescsi_issue_pc()
ide: add ide_transfer_pc() helper
ide-scsi: set drive->scsi flag for devices handled by the driver
ide-{cd,floppy,tape}: remove checking for drive->scsi
ide: add PC_FLAG_ZIP_DRIVE pc flag
ide-tape: factor out waiting for good ireason from idetape_transfer_pc()
ide-tape: set PC_FLAG_DMA_IN_PROGRESS flag in idetape_transfer_pc()
...
Diffstat (limited to 'drivers/ide/ide-atapi.c')
-rw-r--r-- | drivers/ide/ide-atapi.c | 296 |
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 00000000000..2802031de67 --- /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); |