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443 lines
12 KiB
443 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/ide.h> |
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#include <linux/delay.h> |
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static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, |
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u8 stat, u8 err) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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if ((stat & ATA_BUSY) || |
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((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { |
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/* other bits are useless when BUSY */ |
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scsi_req(rq)->result |= ERROR_RESET; |
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} else if (stat & ATA_ERR) { |
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/* err has different meaning on cdrom and tape */ |
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if (err == ATA_ABORTED) { |
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if ((drive->dev_flags & IDE_DFLAG_LBA) && |
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/* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
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hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) |
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return ide_stopped; |
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} else if ((err & BAD_CRC) == BAD_CRC) { |
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/* UDMA crc error, just retry the operation */ |
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drive->crc_count++; |
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} else if (err & (ATA_BBK | ATA_UNC)) { |
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/* retries won't help these */ |
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scsi_req(rq)->result = ERROR_MAX; |
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} else if (err & ATA_TRK0NF) { |
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/* help it find track zero */ |
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scsi_req(rq)->result |= ERROR_RECAL; |
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} |
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} |
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if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
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(hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
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int nsect = drive->mult_count ? drive->mult_count : 1; |
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ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); |
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} |
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if (scsi_req(rq)->result >= ERROR_MAX || blk_noretry_request(rq)) { |
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ide_kill_rq(drive, rq); |
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return ide_stopped; |
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} |
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if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
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scsi_req(rq)->result |= ERROR_RESET; |
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if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) { |
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++scsi_req(rq)->result; |
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return ide_do_reset(drive); |
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} |
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if ((scsi_req(rq)->result & ERROR_RECAL) == ERROR_RECAL) |
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drive->special_flags |= IDE_SFLAG_RECALIBRATE; |
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++scsi_req(rq)->result; |
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return ide_stopped; |
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} |
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static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, |
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u8 stat, u8 err) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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if ((stat & ATA_BUSY) || |
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((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { |
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/* other bits are useless when BUSY */ |
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scsi_req(rq)->result |= ERROR_RESET; |
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} else { |
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/* add decoding error stuff */ |
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} |
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if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
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/* force an abort */ |
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hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
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if (scsi_req(rq)->result >= ERROR_MAX) { |
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ide_kill_rq(drive, rq); |
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} else { |
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if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) { |
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++scsi_req(rq)->result; |
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return ide_do_reset(drive); |
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} |
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++scsi_req(rq)->result; |
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} |
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return ide_stopped; |
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} |
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static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq, |
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u8 stat, u8 err) |
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{ |
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if (drive->media == ide_disk) |
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return ide_ata_error(drive, rq, stat, err); |
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return ide_atapi_error(drive, rq, stat, err); |
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} |
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/** |
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* ide_error - handle an error on the IDE |
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* @drive: drive the error occurred on |
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* @msg: message to report |
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* @stat: status bits |
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* |
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* ide_error() takes action based on the error returned by the drive. |
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* For normal I/O that may well include retries. We deal with |
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* both new-style (taskfile) and old style command handling here. |
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* In the case of taskfile command handling there is work left to |
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* do |
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*/ |
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ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat) |
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{ |
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struct request *rq; |
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u8 err; |
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err = ide_dump_status(drive, msg, stat); |
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rq = drive->hwif->rq; |
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if (rq == NULL) |
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return ide_stopped; |
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/* retry only "normal" I/O: */ |
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if (blk_rq_is_passthrough(rq)) { |
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if (ata_taskfile_request(rq)) { |
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struct ide_cmd *cmd = ide_req(rq)->special; |
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if (cmd) |
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ide_complete_cmd(drive, cmd, stat, err); |
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} else if (ata_pm_request(rq)) { |
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scsi_req(rq)->result = 1; |
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ide_complete_pm_rq(drive, rq); |
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return ide_stopped; |
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} |
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scsi_req(rq)->result = err; |
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ide_complete_rq(drive, err ? BLK_STS_IOERR : BLK_STS_OK, blk_rq_bytes(rq)); |
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return ide_stopped; |
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} |
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return __ide_error(drive, rq, stat, err); |
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} |
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EXPORT_SYMBOL_GPL(ide_error); |
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static inline void ide_complete_drive_reset(ide_drive_t *drive, blk_status_t err) |
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{ |
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struct request *rq = drive->hwif->rq; |
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if (rq && ata_misc_request(rq) && |
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scsi_req(rq)->cmd[0] == REQ_DRIVE_RESET) { |
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if (err <= 0 && scsi_req(rq)->result == 0) |
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scsi_req(rq)->result = -EIO; |
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ide_complete_rq(drive, err, blk_rq_bytes(rq)); |
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} |
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} |
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/* needed below */ |
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static ide_startstop_t do_reset1(ide_drive_t *, int); |
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/* |
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* atapi_reset_pollfunc() gets invoked to poll the interface for completion |
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* every 50ms during an atapi drive reset operation. If the drive has not yet |
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* responded, and we have not yet hit our maximum waiting time, then the timer |
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* is restarted for another 50ms. |
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*/ |
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static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
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u8 stat; |
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tp_ops->dev_select(drive); |
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udelay(10); |
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stat = tp_ops->read_status(hwif); |
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if (OK_STAT(stat, 0, ATA_BUSY)) |
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printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name); |
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else { |
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if (time_before(jiffies, hwif->poll_timeout)) { |
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ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20); |
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/* continue polling */ |
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return ide_started; |
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} |
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/* end of polling */ |
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hwif->polling = 0; |
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printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n", |
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drive->name, stat); |
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/* do it the old fashioned way */ |
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return do_reset1(drive, 1); |
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} |
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/* done polling */ |
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hwif->polling = 0; |
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ide_complete_drive_reset(drive, BLK_STS_OK); |
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return ide_stopped; |
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} |
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static void ide_reset_report_error(ide_hwif_t *hwif, u8 err) |
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{ |
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static const char *err_master_vals[] = |
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{ NULL, "passed", "formatter device error", |
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"sector buffer error", "ECC circuitry error", |
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"controlling MPU error" }; |
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u8 err_master = err & 0x7f; |
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printk(KERN_ERR "%s: reset: master: ", hwif->name); |
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if (err_master && err_master < 6) |
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printk(KERN_CONT "%s", err_master_vals[err_master]); |
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else |
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printk(KERN_CONT "error (0x%02x?)", err); |
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if (err & 0x80) |
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printk(KERN_CONT "; slave: failed"); |
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printk(KERN_CONT "\n"); |
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} |
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/* |
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* reset_pollfunc() gets invoked to poll the interface for completion every 50ms |
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* during an ide reset operation. If the drives have not yet responded, |
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* and we have not yet hit our maximum waiting time, then the timer is restarted |
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* for another 50ms. |
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*/ |
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static ide_startstop_t reset_pollfunc(ide_drive_t *drive) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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const struct ide_port_ops *port_ops = hwif->port_ops; |
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u8 tmp; |
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blk_status_t err = BLK_STS_OK; |
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if (port_ops && port_ops->reset_poll) { |
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err = port_ops->reset_poll(drive); |
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if (err) { |
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printk(KERN_ERR "%s: host reset_poll failure for %s.\n", |
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hwif->name, drive->name); |
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goto out; |
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} |
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} |
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tmp = hwif->tp_ops->read_status(hwif); |
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if (!OK_STAT(tmp, 0, ATA_BUSY)) { |
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if (time_before(jiffies, hwif->poll_timeout)) { |
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ide_set_handler(drive, &reset_pollfunc, HZ/20); |
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/* continue polling */ |
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return ide_started; |
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} |
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printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n", |
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hwif->name, tmp); |
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drive->failures++; |
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err = BLK_STS_IOERR; |
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} else { |
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tmp = ide_read_error(drive); |
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if (tmp == 1) { |
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printk(KERN_INFO "%s: reset: success\n", hwif->name); |
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drive->failures = 0; |
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} else { |
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ide_reset_report_error(hwif, tmp); |
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drive->failures++; |
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err = BLK_STS_IOERR; |
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} |
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} |
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out: |
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hwif->polling = 0; /* done polling */ |
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ide_complete_drive_reset(drive, err); |
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return ide_stopped; |
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} |
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static void ide_disk_pre_reset(ide_drive_t *drive) |
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{ |
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int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; |
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drive->special_flags = |
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legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0; |
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drive->mult_count = 0; |
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drive->dev_flags &= ~IDE_DFLAG_PARKED; |
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if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 && |
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(drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) |
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drive->mult_req = 0; |
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if (drive->mult_req != drive->mult_count) |
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drive->special_flags |= IDE_SFLAG_SET_MULTMODE; |
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} |
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static void pre_reset(ide_drive_t *drive) |
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{ |
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const struct ide_port_ops *port_ops = drive->hwif->port_ops; |
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if (drive->media == ide_disk) |
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ide_disk_pre_reset(drive); |
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else |
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drive->dev_flags |= IDE_DFLAG_POST_RESET; |
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if (drive->dev_flags & IDE_DFLAG_USING_DMA) { |
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if (drive->crc_count) |
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ide_check_dma_crc(drive); |
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else |
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ide_dma_off(drive); |
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} |
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if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) { |
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if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) { |
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drive->dev_flags &= ~IDE_DFLAG_UNMASK; |
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drive->io_32bit = 0; |
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} |
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return; |
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} |
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if (port_ops && port_ops->pre_reset) |
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port_ops->pre_reset(drive); |
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if (drive->current_speed != 0xff) |
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drive->desired_speed = drive->current_speed; |
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drive->current_speed = 0xff; |
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} |
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/* |
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* do_reset1() attempts to recover a confused drive by resetting it. |
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* Unfortunately, resetting a disk drive actually resets all devices on |
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* the same interface, so it can really be thought of as resetting the |
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* interface rather than resetting the drive. |
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* |
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* ATAPI devices have their own reset mechanism which allows them to be |
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* individually reset without clobbering other devices on the same interface. |
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* |
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* Unfortunately, the IDE interface does not generate an interrupt to let |
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* us know when the reset operation has finished, so we must poll for this. |
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* Equally poor, though, is the fact that this may a very long time to complete, |
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* (up to 30 seconds worstcase). So, instead of busy-waiting here for it, |
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* we set a timer to poll at 50ms intervals. |
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*/ |
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static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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struct ide_io_ports *io_ports = &hwif->io_ports; |
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const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
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const struct ide_port_ops *port_ops; |
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ide_drive_t *tdrive; |
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unsigned long flags, timeout; |
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int i; |
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DEFINE_WAIT(wait); |
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spin_lock_irqsave(&hwif->lock, flags); |
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/* We must not reset with running handlers */ |
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BUG_ON(hwif->handler != NULL); |
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/* For an ATAPI device, first try an ATAPI SRST. */ |
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if (drive->media != ide_disk && !do_not_try_atapi) { |
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pre_reset(drive); |
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tp_ops->dev_select(drive); |
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udelay(20); |
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tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); |
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ndelay(400); |
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hwif->poll_timeout = jiffies + WAIT_WORSTCASE; |
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hwif->polling = 1; |
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__ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20); |
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spin_unlock_irqrestore(&hwif->lock, flags); |
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return ide_started; |
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} |
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/* We must not disturb devices in the IDE_DFLAG_PARKED state. */ |
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do { |
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unsigned long now; |
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prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE); |
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timeout = jiffies; |
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ide_port_for_each_present_dev(i, tdrive, hwif) { |
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if ((tdrive->dev_flags & IDE_DFLAG_PARKED) && |
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time_after(tdrive->sleep, timeout)) |
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timeout = tdrive->sleep; |
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} |
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now = jiffies; |
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if (time_before_eq(timeout, now)) |
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break; |
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spin_unlock_irqrestore(&hwif->lock, flags); |
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timeout = schedule_timeout_uninterruptible(timeout - now); |
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spin_lock_irqsave(&hwif->lock, flags); |
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} while (timeout); |
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finish_wait(&ide_park_wq, &wait); |
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/* |
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* First, reset any device state data we were maintaining |
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* for any of the drives on this interface. |
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*/ |
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ide_port_for_each_dev(i, tdrive, hwif) |
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pre_reset(tdrive); |
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if (io_ports->ctl_addr == 0) { |
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spin_unlock_irqrestore(&hwif->lock, flags); |
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ide_complete_drive_reset(drive, BLK_STS_IOERR); |
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return ide_stopped; |
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} |
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/* |
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* Note that we also set nIEN while resetting the device, |
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* to mask unwanted interrupts from the interface during the reset. |
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* However, due to the design of PC hardware, this will cause an |
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* immediate interrupt due to the edge transition it produces. |
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* This single interrupt gives us a "fast poll" for drives that |
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* recover from reset very quickly, saving us the first 50ms wait time. |
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*/ |
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/* set SRST and nIEN */ |
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tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS); |
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/* more than enough time */ |
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udelay(10); |
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/* clear SRST, leave nIEN (unless device is on the quirk list) */ |
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tp_ops->write_devctl(hwif, |
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((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) | |
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ATA_DEVCTL_OBS); |
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/* more than enough time */ |
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udelay(10); |
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hwif->poll_timeout = jiffies + WAIT_WORSTCASE; |
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hwif->polling = 1; |
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__ide_set_handler(drive, &reset_pollfunc, HZ/20); |
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/* |
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* Some weird controller like resetting themselves to a strange |
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* state when the disks are reset this way. At least, the Winbond |
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* 553 documentation says that |
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*/ |
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port_ops = hwif->port_ops; |
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if (port_ops && port_ops->resetproc) |
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port_ops->resetproc(drive); |
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spin_unlock_irqrestore(&hwif->lock, flags); |
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return ide_started; |
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} |
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/* |
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* ide_do_reset() is the entry point to the drive/interface reset code. |
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*/ |
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ide_startstop_t ide_do_reset(ide_drive_t *drive) |
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{ |
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return do_reset1(drive, 0); |
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} |
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EXPORT_SYMBOL(ide_do_reset);
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