#include <linux/kernel.h> #include <linux/ide.h> #include <linux/hdreg.h> int generic_ide_suspend(struct device *dev, pm_message_t mesg) { ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive); ide_hwif_t *hwif = drive->hwif; struct request *rq; struct request_pm_state rqpm; ide_task_t args; int ret; /* call ACPI _GTM only once */ if ((drive->dn & 1) == 0 || pair == NULL) ide_acpi_get_timing(hwif); memset(&rqpm, 0, sizeof(rqpm)); memset(&args, 0, sizeof(args)); rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_PM_SUSPEND; rq->special = &args; rq->data = &rqpm; rqpm.pm_step = IDE_PM_START_SUSPEND; if (mesg.event == PM_EVENT_PRETHAW) mesg.event = PM_EVENT_FREEZE; rqpm.pm_state = mesg.event; ret = blk_execute_rq(drive->queue, NULL, rq, 0); blk_put_request(rq); /* call ACPI _PS3 only after both devices are suspended */ if (ret == 0 && ((drive->dn & 1) || pair == NULL)) ide_acpi_set_state(hwif, 0); return ret; } int generic_ide_resume(struct device *dev) { ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive); ide_hwif_t *hwif = drive->hwif; struct request *rq; struct request_pm_state rqpm; ide_task_t args; int err; /* call ACPI _PS0 / _STM only once */ if ((drive->dn & 1) == 0 || pair == NULL) { ide_acpi_set_state(hwif, 1); ide_acpi_push_timing(hwif); } ide_acpi_exec_tfs(drive); memset(&rqpm, 0, sizeof(rqpm)); memset(&args, 0, sizeof(args)); rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_PM_RESUME; rq->cmd_flags |= REQ_PREEMPT; rq->special = &args; rq->data = &rqpm; rqpm.pm_step = IDE_PM_START_RESUME; rqpm.pm_state = PM_EVENT_ON; err = blk_execute_rq(drive->queue, NULL, rq, 1); blk_put_request(rq); if (err == 0 && dev->driver) { struct ide_driver *drv = to_ide_driver(dev->driver); if (drv->resume) drv->resume(drive); } return err; } void ide_complete_power_step(ide_drive_t *drive, struct request *rq) { struct request_pm_state *pm = rq->data; #ifdef DEBUG_PM printk(KERN_INFO "%s: complete_power_step(step: %d)\n", drive->name, pm->pm_step); #endif if (drive->media != ide_disk) return; switch (pm->pm_step) { case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ if (pm->pm_state == PM_EVENT_FREEZE) pm->pm_step = IDE_PM_COMPLETED; else pm->pm_step = IDE_PM_STANDBY; break; case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ pm->pm_step = IDE_PM_COMPLETED; break; case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ pm->pm_step = IDE_PM_IDLE; break; case IDE_PM_IDLE: /* Resume step 2 (idle)*/ pm->pm_step = IDE_PM_RESTORE_DMA; break; } } ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) { struct request_pm_state *pm = rq->data; ide_task_t *args = rq->special; memset(args, 0, sizeof(*args)); switch (pm->pm_step) { case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ if (drive->media != ide_disk) break; /* Not supported? Switch to next step now. */ if (ata_id_flush_enabled(drive->id) == 0 || (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { ide_complete_power_step(drive, rq); return ide_stopped; } if (ata_id_flush_ext_enabled(drive->id)) args->tf.command = ATA_CMD_FLUSH_EXT; else args->tf.command = ATA_CMD_FLUSH; goto out_do_tf; case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ args->tf.command = ATA_CMD_STANDBYNOW1; goto out_do_tf; case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ ide_set_max_pio(drive); /* * skip IDE_PM_IDLE for ATAPI devices */ if (drive->media != ide_disk) pm->pm_step = IDE_PM_RESTORE_DMA; else ide_complete_power_step(drive, rq); return ide_stopped; case IDE_PM_IDLE: /* Resume step 2 (idle) */ args->tf.command = ATA_CMD_IDLEIMMEDIATE; goto out_do_tf; case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ /* * Right now, all we do is call ide_set_dma(drive), * we could be smarter and check for current xfer_speed * in struct drive etc... */ if (drive->hwif->dma_ops == NULL) break; /* * TODO: respect IDE_DFLAG_USING_DMA */ ide_set_dma(drive); break; } pm->pm_step = IDE_PM_COMPLETED; return ide_stopped; out_do_tf: args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; args->data_phase = TASKFILE_NO_DATA; return do_rw_taskfile(drive, args); } /** * ide_complete_pm_request - end the current Power Management request * @drive: target drive * @rq: request * * This function cleans up the current PM request and stops the queue * if necessary. */ void ide_complete_pm_request(ide_drive_t *drive, struct request *rq) { struct request_queue *q = drive->queue; unsigned long flags; #ifdef DEBUG_PM printk("%s: completing PM request, %s\n", drive->name, blk_pm_suspend_request(rq) ? "suspend" : "resume"); #endif spin_lock_irqsave(q->queue_lock, flags); if (blk_pm_suspend_request(rq)) blk_stop_queue(q); else drive->dev_flags &= ~IDE_DFLAG_BLOCKED; spin_unlock_irqrestore(q->queue_lock, flags); drive->hwif->rq = NULL; if (blk_end_request(rq, 0, 0)) BUG(); } void ide_check_pm_state(ide_drive_t *drive, struct request *rq) { struct request_pm_state *pm = rq->data; if (blk_pm_suspend_request(rq) && pm->pm_step == IDE_PM_START_SUSPEND) /* Mark drive blocked when starting the suspend sequence. */ drive->dev_flags |= IDE_DFLAG_BLOCKED; else if (blk_pm_resume_request(rq) && pm->pm_step == IDE_PM_START_RESUME) { /* * The first thing we do on wakeup is to wait for BSY bit to * go away (with a looong timeout) as a drive on this hwif may * just be POSTing itself. * We do that before even selecting as the "other" device on * the bus may be broken enough to walk on our toes at this * point. */ ide_hwif_t *hwif = drive->hwif; struct request_queue *q = drive->queue; unsigned long flags; int rc; #ifdef DEBUG_PM printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); #endif rc = ide_wait_not_busy(hwif, 35000); if (rc) printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); SELECT_DRIVE(drive); hwif->tp_ops->set_irq(hwif, 1); rc = ide_wait_not_busy(hwif, 100000); if (rc) printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); spin_lock_irqsave(q->queue_lock, flags); blk_start_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); } }