drivers/ide/ide-pm.c

   1 #include <linux/kernel.h>
   2 #include <linux/ide.h>
   3 #include <linux/hdreg.h>
   4
   5 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
   6 {
   7         ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
   8         ide_hwif_t *hwif = drive->hwif;
   9         struct request *rq;
  10         struct request_pm_state rqpm;
  11         ide_task_t args;
  12         int ret;
  13
  14         /* call ACPI _GTM only once */
  15         if ((drive->dn & 1) == 0 || pair == NULL)
  16                 ide_acpi_get_timing(hwif);
  17
  18         memset(&rqpm, 0, sizeof(rqpm));
  19         memset(&args, 0, sizeof(args));
  20         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  21         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
  22         rq->special = &args;
  23         rq->data = &rqpm;
  24         rqpm.pm_step = IDE_PM_START_SUSPEND;
  25         if (mesg.event == PM_EVENT_PRETHAW)
  26                 mesg.event = PM_EVENT_FREEZE;
  27         rqpm.pm_state = mesg.event;
  28
  29         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
  30         blk_put_request(rq);
  31
  32         /* call ACPI _PS3 only after both devices are suspended */
  33         if (ret == 0 && ((drive->dn & 1) || pair == NULL))
  34                 ide_acpi_set_state(hwif, 0);
  35
  36         return ret;
  37 }
  38
  39 int generic_ide_resume(struct device *dev)
  40 {
  41         ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
  42         ide_hwif_t *hwif = drive->hwif;
  43         struct request *rq;
  44         struct request_pm_state rqpm;
  45         ide_task_t args;
  46         int err;
  47
  48         /* call ACPI _PS0 / _STM only once */
  49         if ((drive->dn & 1) == 0 || pair == NULL) {
  50                 ide_acpi_set_state(hwif, 1);
  51                 ide_acpi_push_timing(hwif);
  52         }
  53
  54         ide_acpi_exec_tfs(drive);
  55
  56         memset(&rqpm, 0, sizeof(rqpm));
  57         memset(&args, 0, sizeof(args));
  58         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  59         rq->cmd_type = REQ_TYPE_PM_RESUME;
  60         rq->cmd_flags |= REQ_PREEMPT;
  61         rq->special = &args;
  62         rq->data = &rqpm;
  63         rqpm.pm_step = IDE_PM_START_RESUME;
  64         rqpm.pm_state = PM_EVENT_ON;
  65
  66         err = blk_execute_rq(drive->queue, NULL, rq, 1);
  67         blk_put_request(rq);
  68
  69         if (err == 0 && dev->driver) {
  70                 struct ide_driver *drv = to_ide_driver(dev->driver);
  71
  72                 if (drv->resume)
  73                         drv->resume(drive);
  74         }
  75
  76         return err;
  77 }
  78
  79 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
  80 {
  81         struct request_pm_state *pm = rq->data;
  82
  83 #ifdef DEBUG_PM
  84         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
  85                 drive->name, pm->pm_step);
  86 #endif
  87         if (drive->media != ide_disk)
  88                 return;
  89
  90         switch (pm->pm_step) {
  91         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
  92                 if (pm->pm_state == PM_EVENT_FREEZE)
  93                         pm->pm_step = IDE_PM_COMPLETED;
  94                 else
  95                         pm->pm_step = IDE_PM_STANDBY;
  96                 break;
  97         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
  98                 pm->pm_step = IDE_PM_COMPLETED;
  99                 break;
 100         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 101                 pm->pm_step = IDE_PM_IDLE;
 102                 break;
 103         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 104                 pm->pm_step = IDE_PM_RESTORE_DMA;
 105                 break;
 106         }
 107 }
 108
 109 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 110 {
 111         struct request_pm_state *pm = rq->data;
 112         ide_task_t *args = rq->special;
 113
 114         memset(args, 0, sizeof(*args));
 115
 116         switch (pm->pm_step) {
 117         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 118                 if (drive->media != ide_disk)
 119                         break;
 120                 /* Not supported? Switch to next step now. */
 121                 if (ata_id_flush_enabled(drive->id) == 0 ||
 122                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 123                         ide_complete_power_step(drive, rq);
 124                         return ide_stopped;
 125                 }
 126                 if (ata_id_flush_ext_enabled(drive->id))
 127                         args->tf.command = ATA_CMD_FLUSH_EXT;
 128                 else
 129                         args->tf.command = ATA_CMD_FLUSH;
 130                 goto out_do_tf;
 131         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 132                 args->tf.command = ATA_CMD_STANDBYNOW1;
 133                 goto out_do_tf;
 134         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 135                 ide_set_max_pio(drive);
 136                 /*
 137                  * skip IDE_PM_IDLE for ATAPI devices
 138                  */
 139                 if (drive->media != ide_disk)
 140                         pm->pm_step = IDE_PM_RESTORE_DMA;
 141                 else
 142                         ide_complete_power_step(drive, rq);
 143                 return ide_stopped;
 144         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 145                 args->tf.command = ATA_CMD_IDLEIMMEDIATE;
 146                 goto out_do_tf;
 147         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 148                 /*
 149                  * Right now, all we do is call ide_set_dma(drive),
 150                  * we could be smarter and check for current xfer_speed
 151                  * in struct drive etc...
 152                  */
 153                 if (drive->hwif->dma_ops == NULL)
 154                         break;
 155                 /*
 156                  * TODO: respect IDE_DFLAG_USING_DMA
 157                  */
 158                 ide_set_dma(drive);
 159                 break;
 160         }
 161
 162         pm->pm_step = IDE_PM_COMPLETED;
 163         return ide_stopped;
 164
 165 out_do_tf:
 166         args->tf_flags   = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 167         args->data_phase = TASKFILE_NO_DATA;
 168         return do_rw_taskfile(drive, args);
 169 }
 170
 171 /**
 172  *      ide_complete_pm_request - end the current Power Management request
 173  *      @drive: target drive
 174  *      @rq: request
 175  *
 176  *      This function cleans up the current PM request and stops the queue
 177  *      if necessary.
 178  */
 179 void ide_complete_pm_request(ide_drive_t *drive, struct request *rq)
 180 {
 181         struct request_queue *q = drive->queue;
 182         unsigned long flags;
 183
 184 #ifdef DEBUG_PM
 185         printk("%s: completing PM request, %s\n", drive->name,
 186                blk_pm_suspend_request(rq) ? "suspend" : "resume");
 187 #endif
 188         spin_lock_irqsave(q->queue_lock, flags);
 189         if (blk_pm_suspend_request(rq)) {
 190                 blk_stop_queue(q);
 191         } else {
 192                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 193                 blk_start_queue(q);
 194         }
 195         spin_unlock_irqrestore(q->queue_lock, flags);
 196
 197         drive->hwif->rq = NULL;
 198
 199         if (blk_end_request(rq, 0, 0))
 200                 BUG();
 201 }
 202
 203 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 204 {
 205         struct request_pm_state *pm = rq->data;
 206
 207         if (blk_pm_suspend_request(rq) &&
 208             pm->pm_step == IDE_PM_START_SUSPEND)
 209                 /* Mark drive blocked when starting the suspend sequence. */
 210                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 211         else if (blk_pm_resume_request(rq) &&
 212                  pm->pm_step == IDE_PM_START_RESUME) {
 213                 /*
 214                  * The first thing we do on wakeup is to wait for BSY bit to
 215                  * go away (with a looong timeout) as a drive on this hwif may
 216                  * just be POSTing itself.
 217                  * We do that before even selecting as the "other" device on
 218                  * the bus may be broken enough to walk on our toes at this
 219                  * point.
 220                  */
 221                 ide_hwif_t *hwif = drive->hwif;
 222                 int rc;
 223 #ifdef DEBUG_PM
 224                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 225 #endif
 226                 rc = ide_wait_not_busy(hwif, 35000);
 227                 if (rc)
 228                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 229                 SELECT_DRIVE(drive);
 230                 hwif->tp_ops->set_irq(hwif, 1);
 231                 rc = ide_wait_not_busy(hwif, 100000);
 232                 if (rc)
 233                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 234         }
 235 }