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         if (ide_port_acpi(hwif)) {
  14                 /* call ACPI _GTM only once */
  15                 if ((drive->dn & 1) == 0 || pair == NULL)
  16                         ide_acpi_get_timing(hwif);
  17         }
  18
  19         memset(&rqpm, 0, sizeof(rqpm));
  20         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  21         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
  22         rq->special = &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         if (ret == 0 && ide_port_acpi(hwif)) {
  32                 /* call ACPI _PS3 only after both devices are suspended */
  33                 if ((drive->dn & 1) || pair == NULL)
  34                         ide_acpi_set_state(hwif, 0);
  35         }
  36
  37         return ret;
  38 }
  39
  40 int generic_ide_resume(struct device *dev)
  41 {
  42         ide_drive_t *drive = dev_get_drvdata(dev);
  43         ide_drive_t *pair = ide_get_pair_dev(drive);
  44         ide_hwif_t *hwif = drive->hwif;
  45         struct request *rq;
  46         struct request_pm_state rqpm;
  47         int err;
  48
  49         if (ide_port_acpi(hwif)) {
  50                 /* call ACPI _PS0 / _STM only once */
  51                 if ((drive->dn & 1) == 0 || pair == NULL) {
  52                         ide_acpi_set_state(hwif, 1);
  53                         ide_acpi_push_timing(hwif);
  54                 }
  55
  56                 ide_acpi_exec_tfs(drive);
  57         }
  58
  59         memset(&rqpm, 0, sizeof(rqpm));
  60         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  61         rq->cmd_type = REQ_TYPE_PM_RESUME;
  62         rq->cmd_flags |= REQ_PREEMPT;
  63         rq->special = &rqpm;
  64         rqpm.pm_step = IDE_PM_START_RESUME;
  65         rqpm.pm_state = PM_EVENT_ON;
  66
  67         err = blk_execute_rq(drive->queue, NULL, rq, 1);
  68         blk_put_request(rq);
  69
  70         if (err == 0 && dev->driver) {
  71                 struct ide_driver *drv = to_ide_driver(dev->driver);
  72
  73                 if (drv->resume)
  74                         drv->resume(drive);
  75         }
  76
  77         return err;
  78 }
  79
  80 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
  81 {
  82         struct request_pm_state *pm = rq->special;
  83
  84 #ifdef DEBUG_PM
  85         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
  86                 drive->name, pm->pm_step);
  87 #endif
  88         if (drive->media != ide_disk)
  89                 return;
  90
  91         switch (pm->pm_step) {
  92         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
  93                 if (pm->pm_state == PM_EVENT_FREEZE)
  94                         pm->pm_step = IDE_PM_COMPLETED;
  95                 else
  96                         pm->pm_step = IDE_PM_STANDBY;
  97                 break;
  98         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
  99                 pm->pm_step = IDE_PM_COMPLETED;
 100                 break;
 101         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 102                 pm->pm_step = IDE_PM_IDLE;
 103                 break;
 104         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 105                 pm->pm_step = IDE_PM_RESTORE_DMA;
 106                 break;
 107         }
 108 }
 109
 110 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 111 {
 112         struct request_pm_state *pm = rq->special;
 113         struct ide_cmd 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.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 167         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 168         cmd.protocol = ATA_PROT_NODATA;
 169
 170         return do_rw_taskfile(drive, &cmd);
 171 }
 172
 173 /**
 174  *      ide_complete_pm_rq - end the current Power Management request
 175  *      @drive: target drive
 176  *      @rq: request
 177  *
 178  *      This function cleans up the current PM request and stops the queue
 179  *      if necessary.
 180  */
 181 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 182 {
 183         struct request_queue *q = drive->queue;
 184         struct request_pm_state *pm = rq->special;
 185         unsigned long flags;
 186
 187         ide_complete_power_step(drive, rq);
 188         if (pm->pm_step != IDE_PM_COMPLETED)
 189                 return;
 190
 191 #ifdef DEBUG_PM
 192         printk("%s: completing PM request, %s\n", drive->name,
 193                blk_pm_suspend_request(rq) ? "suspend" : "resume");
 194 #endif
 195         spin_lock_irqsave(q->queue_lock, flags);
 196         if (blk_pm_suspend_request(rq))
 197                 blk_stop_queue(q);
 198         else
 199                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 200         spin_unlock_irqrestore(q->queue_lock, flags);
 201
 202         drive->hwif->rq = NULL;
 203
 204         if (blk_end_request(rq, 0, 0))
 205                 BUG();
 206 }
 207
 208 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 209 {
 210         struct request_pm_state *pm = rq->special;
 211
 212         if (blk_pm_suspend_request(rq) &&
 213             pm->pm_step == IDE_PM_START_SUSPEND)
 214                 /* Mark drive blocked when starting the suspend sequence. */
 215                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 216         else if (blk_pm_resume_request(rq) &&
 217                  pm->pm_step == IDE_PM_START_RESUME) {
 218                 /*
 219                  * The first thing we do on wakeup is to wait for BSY bit to
 220                  * go away (with a looong timeout) as a drive on this hwif may
 221                  * just be POSTing itself.
 222                  * We do that before even selecting as the "other" device on
 223                  * the bus may be broken enough to walk on our toes at this
 224                  * point.
 225                  */
 226                 ide_hwif_t *hwif = drive->hwif;
 227                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 228                 struct request_queue *q = drive->queue;
 229                 unsigned long flags;
 230                 int rc;
 231 #ifdef DEBUG_PM
 232                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 233 #endif
 234                 rc = ide_wait_not_busy(hwif, 35000);
 235                 if (rc)
 236                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 237                 tp_ops->dev_select(drive);
 238                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 239                 rc = ide_wait_not_busy(hwif, 100000);
 240                 if (rc)
 241                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 242
 243                 spin_lock_irqsave(q->queue_lock, flags);
 244                 blk_start_queue(q);
 245                 spin_unlock_irqrestore(q->queue_lock, flags);
 246         }
 247 }