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         struct ide_cmd cmd;
  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         memset(&cmd, 0, sizeof(cmd));
  19         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  20         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
  21         rq->special = &cmd;
  22         rq->data = &rqpm;
  23         rqpm.pm_step = IDE_PM_START_SUSPEND;
  24         if (mesg.event == PM_EVENT_PRETHAW)
  25                 mesg.event = PM_EVENT_FREEZE;
  26         rqpm.pm_state = mesg.event;
  27
  28         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
  29         blk_put_request(rq);
  30
  31         /* call ACPI _PS3 only after both devices are suspended */
  32         if (ret == 0 && ((drive->dn & 1) || pair == NULL))
  33                 ide_acpi_set_state(hwif, 0);
  34
  35         return ret;
  36 }
  37
  38 int generic_ide_resume(struct device *dev)
  39 {
  40         ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
  41         ide_hwif_t *hwif = drive->hwif;
  42         struct request *rq;
  43         struct request_pm_state rqpm;
  44         struct ide_cmd cmd;
  45         int err;
  46
  47         /* call ACPI _PS0 / _STM only once */
  48         if ((drive->dn & 1) == 0 || pair == NULL) {
  49                 ide_acpi_set_state(hwif, 1);
  50                 ide_acpi_push_timing(hwif);
  51         }
  52
  53         ide_acpi_exec_tfs(drive);
  54
  55         memset(&rqpm, 0, sizeof(rqpm));
  56         memset(&cmd, 0, sizeof(cmd));
  57         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  58         rq->cmd_type = REQ_TYPE_PM_RESUME;
  59         rq->cmd_flags |= REQ_PREEMPT;
  60         rq->special = &cmd;
  61         rq->data = &rqpm;
  62         rqpm.pm_step = IDE_PM_START_RESUME;
  63         rqpm.pm_state = PM_EVENT_ON;
  64
  65         err = blk_execute_rq(drive->queue, NULL, rq, 1);
  66         blk_put_request(rq);
  67
  68         if (err == 0 && dev->driver) {
  69                 struct ide_driver *drv = to_ide_driver(dev->driver);
  70
  71                 if (drv->resume)
  72                         drv->resume(drive);
  73         }
  74
  75         return err;
  76 }
  77
  78 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
  79 {
  80         struct request_pm_state *pm = rq->data;
  81
  82 #ifdef DEBUG_PM
  83         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
  84                 drive->name, pm->pm_step);
  85 #endif
  86         if (drive->media != ide_disk)
  87                 return;
  88
  89         switch (pm->pm_step) {
  90         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
  91                 if (pm->pm_state == PM_EVENT_FREEZE)
  92                         pm->pm_step = IDE_PM_COMPLETED;
  93                 else
  94                         pm->pm_step = IDE_PM_STANDBY;
  95                 break;
  96         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
  97                 pm->pm_step = IDE_PM_COMPLETED;
  98                 break;
  99         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 100                 pm->pm_step = IDE_PM_IDLE;
 101                 break;
 102         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 103                 pm->pm_step = IDE_PM_RESTORE_DMA;
 104                 break;
 105         }
 106 }
 107
 108 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 109 {
 110         struct request_pm_state *pm = rq->data;
 111         struct ide_cmd *cmd = rq->special;
 112
 113         memset(cmd, 0, sizeof(*cmd));
 114
 115         switch (pm->pm_step) {
 116         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 117                 if (drive->media != ide_disk)
 118                         break;
 119                 /* Not supported? Switch to next step now. */
 120                 if (ata_id_flush_enabled(drive->id) == 0 ||
 121                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 122                         ide_complete_power_step(drive, rq);
 123                         return ide_stopped;
 124                 }
 125                 if (ata_id_flush_ext_enabled(drive->id))
 126                         cmd->tf.command = ATA_CMD_FLUSH_EXT;
 127                 else
 128                         cmd->tf.command = ATA_CMD_FLUSH;
 129                 goto out_do_tf;
 130         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 131                 cmd->tf.command = ATA_CMD_STANDBYNOW1;
 132                 goto out_do_tf;
 133         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 134                 ide_set_max_pio(drive);
 135                 /*
 136                  * skip IDE_PM_IDLE for ATAPI devices
 137                  */
 138                 if (drive->media != ide_disk)
 139                         pm->pm_step = IDE_PM_RESTORE_DMA;
 140                 else
 141                         ide_complete_power_step(drive, rq);
 142                 return ide_stopped;
 143         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 144                 cmd->tf.command = ATA_CMD_IDLEIMMEDIATE;
 145                 goto out_do_tf;
 146         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 147                 /*
 148                  * Right now, all we do is call ide_set_dma(drive),
 149                  * we could be smarter and check for current xfer_speed
 150                  * in struct drive etc...
 151                  */
 152                 if (drive->hwif->dma_ops == NULL)
 153                         break;
 154                 /*
 155                  * TODO: respect IDE_DFLAG_USING_DMA
 156                  */
 157                 ide_set_dma(drive);
 158                 break;
 159         }
 160
 161         pm->pm_step = IDE_PM_COMPLETED;
 162
 163         return ide_stopped;
 164
 165 out_do_tf:
 166         cmd->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 167         cmd->protocol = ATA_PROT_NODATA;
 168
 169         return do_rw_taskfile(drive, cmd);
 170 }
 171
 172 /**
 173  *      ide_complete_pm_rq - end the current Power Management request
 174  *      @drive: target drive
 175  *      @rq: request
 176  *
 177  *      This function cleans up the current PM request and stops the queue
 178  *      if necessary.
 179  */
 180 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 181 {
 182         struct request_queue *q = drive->queue;
 183         struct request_pm_state *pm = rq->data;
 184         unsigned long flags;
 185
 186         ide_complete_power_step(drive, rq);
 187         if (pm->pm_step != IDE_PM_COMPLETED)
 188                 return;
 189
 190 #ifdef DEBUG_PM
 191         printk("%s: completing PM request, %s\n", drive->name,
 192                blk_pm_suspend_request(rq) ? "suspend" : "resume");
 193 #endif
 194         spin_lock_irqsave(q->queue_lock, flags);
 195         if (blk_pm_suspend_request(rq))
 196                 blk_stop_queue(q);
 197         else
 198                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 199         spin_unlock_irqrestore(q->queue_lock, flags);
 200
 201         drive->hwif->rq = NULL;
 202
 203         if (blk_end_request(rq, 0, 0))
 204                 BUG();
 205 }
 206
 207 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 208 {
 209         struct request_pm_state *pm = rq->data;
 210
 211         if (blk_pm_suspend_request(rq) &&
 212             pm->pm_step == IDE_PM_START_SUSPEND)
 213                 /* Mark drive blocked when starting the suspend sequence. */
 214                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 215         else if (blk_pm_resume_request(rq) &&
 216                  pm->pm_step == IDE_PM_START_RESUME) {
 217                 /*
 218                  * The first thing we do on wakeup is to wait for BSY bit to
 219                  * go away (with a looong timeout) as a drive on this hwif may
 220                  * just be POSTing itself.
 221                  * We do that before even selecting as the "other" device on
 222                  * the bus may be broken enough to walk on our toes at this
 223                  * point.
 224                  */
 225                 ide_hwif_t *hwif = drive->hwif;
 226                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 227                 struct request_queue *q = drive->queue;
 228                 unsigned long flags;
 229                 int rc;
 230 #ifdef DEBUG_PM
 231                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 232 #endif
 233                 rc = ide_wait_not_busy(hwif, 35000);
 234                 if (rc)
 235                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 236                 tp_ops->dev_select(drive);
 237                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 238                 rc = ide_wait_not_busy(hwif, 100000);
 239                 if (rc)
 240                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 241
 242                 spin_lock_irqsave(q->queue_lock, flags);
 243                 blk_start_queue(q);
 244                 spin_unlock_irqrestore(q->queue_lock, flags);
 245         }
 246 }