drivers/ide/ide-pm.c

   1 #include <linux/kernel.h>
   2 #include <linux/ide.h>
   3
   4 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
   5 {
   6         ide_drive_t *drive = dev_get_drvdata(dev);
   7         ide_drive_t *pair = ide_get_pair_dev(drive);
   8         ide_hwif_t *hwif = drive->hwif;
   9         struct request *rq;
  10         struct request_pm_state rqpm;
  11         int ret;
  12
  13         /* call ACPI _GTM only once */
  14         if ((drive->dn & 1) == 0 || pair == NULL)
  15                 ide_acpi_get_timing(hwif);
  16
  17         memset(&rqpm, 0, sizeof(rqpm));
  18         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  19         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
  20         rq->special = &rqpm;
  21         rqpm.pm_step = IDE_PM_START_SUSPEND;
  22         if (mesg.event == PM_EVENT_PRETHAW)
  23                 mesg.event = PM_EVENT_FREEZE;
  24         rqpm.pm_state = mesg.event;
  25
  26         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
  27         blk_put_request(rq);
  28
  29         /* call ACPI _PS3 only after both devices are suspended */
  30         if (ret == 0 && ((drive->dn & 1) || pair == NULL))
  31                 ide_acpi_set_state(hwif, 0);
  32
  33         return ret;
  34 }
  35
  36 int generic_ide_resume(struct device *dev)
  37 {
  38         ide_drive_t *drive = dev_get_drvdata(dev);
  39         ide_drive_t *pair = ide_get_pair_dev(drive);
  40         ide_hwif_t *hwif = drive->hwif;
  41         struct request *rq;
  42         struct request_pm_state rqpm;
  43         int err;
  44
  45         /* call ACPI _PS0 / _STM only once */
  46         if ((drive->dn & 1) == 0 || pair == NULL) {
  47                 ide_acpi_set_state(hwif, 1);
  48                 ide_acpi_push_timing(hwif);
  49         }
  50
  51         ide_acpi_exec_tfs(drive);
  52
  53         memset(&rqpm, 0, sizeof(rqpm));
  54         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  55         rq->cmd_type = REQ_TYPE_PM_RESUME;
  56         rq->cmd_flags |= REQ_PREEMPT;
  57         rq->special = &rqpm;
  58         rqpm.pm_step = IDE_PM_START_RESUME;
  59         rqpm.pm_state = PM_EVENT_ON;
  60
  61         err = blk_execute_rq(drive->queue, NULL, rq, 1);
  62         blk_put_request(rq);
  63
  64         if (err == 0 && dev->driver) {
  65                 struct ide_driver *drv = to_ide_driver(dev->driver);
  66
  67                 if (drv->resume)
  68                         drv->resume(drive);
  69         }
  70
  71         return err;
  72 }
  73
  74 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
  75 {
  76         struct request_pm_state *pm = rq->special;
  77
  78 #ifdef DEBUG_PM
  79         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
  80                 drive->name, pm->pm_step);
  81 #endif
  82         if (drive->media != ide_disk)
  83                 return;
  84
  85         switch (pm->pm_step) {
  86         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
  87                 if (pm->pm_state == PM_EVENT_FREEZE)
  88                         pm->pm_step = IDE_PM_COMPLETED;
  89                 else
  90                         pm->pm_step = IDE_PM_STANDBY;
  91                 break;
  92         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
  93                 pm->pm_step = IDE_PM_COMPLETED;
  94                 break;
  95         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
  96                 pm->pm_step = IDE_PM_IDLE;
  97                 break;
  98         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
  99                 pm->pm_step = IDE_PM_RESTORE_DMA;
 100                 break;
 101         }
 102 }
 103
 104 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 105 {
 106         struct request_pm_state *pm = rq->special;
 107         struct ide_cmd cmd = { };
 108
 109         switch (pm->pm_step) {
 110         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 111                 if (drive->media != ide_disk)
 112                         break;
 113                 /* Not supported? Switch to next step now. */
 114                 if (ata_id_flush_enabled(drive->id) == 0 ||
 115                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 116                         ide_complete_power_step(drive, rq);
 117                         return ide_stopped;
 118                 }
 119                 if (ata_id_flush_ext_enabled(drive->id))
 120                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
 121                 else
 122                         cmd.tf.command = ATA_CMD_FLUSH;
 123                 goto out_do_tf;
 124         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 125                 cmd.tf.command = ATA_CMD_STANDBYNOW1;
 126                 goto out_do_tf;
 127         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 128                 ide_set_max_pio(drive);
 129                 /*
 130                  * skip IDE_PM_IDLE for ATAPI devices
 131                  */
 132                 if (drive->media != ide_disk)
 133                         pm->pm_step = IDE_PM_RESTORE_DMA;
 134                 else
 135                         ide_complete_power_step(drive, rq);
 136                 return ide_stopped;
 137         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 138                 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
 139                 goto out_do_tf;
 140         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 141                 /*
 142                  * Right now, all we do is call ide_set_dma(drive),
 143                  * we could be smarter and check for current xfer_speed
 144                  * in struct drive etc...
 145                  */
 146                 if (drive->hwif->dma_ops == NULL)
 147                         break;
 148                 /*
 149                  * TODO: respect IDE_DFLAG_USING_DMA
 150                  */
 151                 ide_set_dma(drive);
 152                 break;
 153         }
 154
 155         pm->pm_step = IDE_PM_COMPLETED;
 156
 157         return ide_stopped;
 158
 159 out_do_tf:
 160         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 161         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 162         cmd.protocol = ATA_PROT_NODATA;
 163
 164         return do_rw_taskfile(drive, &cmd);
 165 }
 166
 167 /**
 168  *      ide_complete_pm_rq - end the current Power Management request
 169  *      @drive: target drive
 170  *      @rq: request
 171  *
 172  *      This function cleans up the current PM request and stops the queue
 173  *      if necessary.
 174  */
 175 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 176 {
 177         struct request_queue *q = drive->queue;
 178         struct request_pm_state *pm = rq->special;
 179         unsigned long flags;
 180
 181         ide_complete_power_step(drive, rq);
 182         if (pm->pm_step != IDE_PM_COMPLETED)
 183                 return;
 184
 185 #ifdef DEBUG_PM
 186         printk("%s: completing PM request, %s\n", drive->name,
 187                blk_pm_suspend_request(rq) ? "suspend" : "resume");
 188 #endif
 189         spin_lock_irqsave(q->queue_lock, flags);
 190         if (blk_pm_suspend_request(rq))
 191                 blk_stop_queue(q);
 192         else
 193                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 194         spin_unlock_irqrestore(q->queue_lock, flags);
 195
 196         drive->hwif->rq = NULL;
 197
 198         if (blk_end_request(rq, 0, 0))
 199                 BUG();
 200 }
 201
 202 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 203 {
 204         struct request_pm_state *pm = rq->special;
 205
 206         if (blk_pm_suspend_request(rq) &&
 207             pm->pm_step == IDE_PM_START_SUSPEND)
 208                 /* Mark drive blocked when starting the suspend sequence. */
 209                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 210         else if (blk_pm_resume_request(rq) &&
 211                  pm->pm_step == IDE_PM_START_RESUME) {
 212                 /*
 213                  * The first thing we do on wakeup is to wait for BSY bit to
 214                  * go away (with a looong timeout) as a drive on this hwif may
 215                  * just be POSTing itself.
 216                  * We do that before even selecting as the "other" device on
 217                  * the bus may be broken enough to walk on our toes at this
 218                  * point.
 219                  */
 220                 ide_hwif_t *hwif = drive->hwif;
 221                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 222                 struct request_queue *q = drive->queue;
 223                 unsigned long flags;
 224                 int rc;
 225 #ifdef DEBUG_PM
 226                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 227 #endif
 228                 rc = ide_wait_not_busy(hwif, 35000);
 229                 if (rc)
 230                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 231                 tp_ops->dev_select(drive);
 232                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 233                 rc = ide_wait_not_busy(hwif, 100000);
 234                 if (rc)
 235                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 236
 237                 spin_lock_irqsave(q->queue_lock, flags);
 238                 blk_start_queue(q);
 239                 spin_unlock_irqrestore(q->queue_lock, flags);
 240         }
 241 }