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