drivers/ide/ide-pm.c

   1 #include <linux/kernel.h>
   2 #include <linux/gfp.h>
   3 #include <linux/ide.h>
   4
   5 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
   6 {
   7         ide_drive_t *drive = dev_get_drvdata(dev);
   8         ide_drive_t *pair = ide_get_pair_dev(drive);
   9         ide_hwif_t *hwif = drive->hwif;
  10         struct request *rq;
  11         struct request_pm_state rqpm;
  12         int ret;
  13
  14         if (ide_port_acpi(hwif)) {
  15                 /* call ACPI _GTM only once */
  16                 if ((drive->dn & 1) == 0 || pair == NULL)
  17                         ide_acpi_get_timing(hwif);
  18         }
  19
  20         memset(&rqpm, 0, sizeof(rqpm));
  21         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  22         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
  23         rq->special = &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         if (ret == 0 && ide_port_acpi(hwif)) {
  33                 /* call ACPI _PS3 only after both devices are suspended */
  34                 if ((drive->dn & 1) || pair == NULL)
  35                         ide_acpi_set_state(hwif, 0);
  36         }
  37
  38         return ret;
  39 }
  40
  41 int generic_ide_resume(struct device *dev)
  42 {
  43         ide_drive_t *drive = dev_get_drvdata(dev);
  44         ide_drive_t *pair = ide_get_pair_dev(drive);
  45         ide_hwif_t *hwif = drive->hwif;
  46         struct request *rq;
  47         struct request_pm_state rqpm;
  48         int err;
  49
  50         if (ide_port_acpi(hwif)) {
  51                 /* call ACPI _PS0 / _STM only once */
  52                 if ((drive->dn & 1) == 0 || pair == NULL) {
  53                         ide_acpi_set_state(hwif, 1);
  54                         ide_acpi_push_timing(hwif);
  55                 }
  56
  57                 ide_acpi_exec_tfs(drive);
  58         }
  59
  60         memset(&rqpm, 0, sizeof(rqpm));
  61         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  62         rq->cmd_type = REQ_TYPE_PM_RESUME;
  63         rq->cmd_flags |= REQ_PREEMPT;
  64         rq->special = &rqpm;
  65         rqpm.pm_step = IDE_PM_START_RESUME;
  66         rqpm.pm_state = PM_EVENT_ON;
  67
  68         err = blk_execute_rq(drive->queue, NULL, rq, 1);
  69         blk_put_request(rq);
  70
  71         if (err == 0 && dev->driver) {
  72                 struct ide_driver *drv = to_ide_driver(dev->driver);
  73
  74                 if (drv->resume)
  75                         drv->resume(drive);
  76         }
  77
  78         return err;
  79 }
  80
  81 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
  82 {
  83         struct request_pm_state *pm = rq->special;
  84
  85 #ifdef DEBUG_PM
  86         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
  87                 drive->name, pm->pm_step);
  88 #endif
  89         if (drive->media != ide_disk)
  90                 return;
  91
  92         switch (pm->pm_step) {
  93         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
  94                 if (pm->pm_state == PM_EVENT_FREEZE)
  95                         pm->pm_step = IDE_PM_COMPLETED;
  96                 else
  97                         pm->pm_step = IDE_PM_STANDBY;
  98                 break;
  99         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 100                 pm->pm_step = IDE_PM_COMPLETED;
 101                 break;
 102         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 103                 pm->pm_step = IDE_PM_IDLE;
 104                 break;
 105         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 106                 pm->pm_step = IDE_PM_RESTORE_DMA;
 107                 break;
 108         }
 109 }
 110
 111 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 112 {
 113         struct request_pm_state *pm = rq->special;
 114         struct ide_cmd cmd = { };
 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                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
 128                 else
 129                         cmd.tf.command = ATA_CMD_FLUSH;
 130                 goto out_do_tf;
 131         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 132                 cmd.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                 cmd.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
 164         return ide_stopped;
 165
 166 out_do_tf:
 167         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 168         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 169         cmd.protocol = ATA_PROT_NODATA;
 170
 171         return do_rw_taskfile(drive, &cmd);
 172 }
 173
 174 /**
 175  *      ide_complete_pm_rq - end the current Power Management request
 176  *      @drive: target drive
 177  *      @rq: request
 178  *
 179  *      This function cleans up the current PM request and stops the queue
 180  *      if necessary.
 181  */
 182 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 183 {
 184         struct request_queue *q = drive->queue;
 185         struct request_pm_state *pm = rq->special;
 186         unsigned long flags;
 187
 188         ide_complete_power_step(drive, rq);
 189         if (pm->pm_step != IDE_PM_COMPLETED)
 190                 return;
 191
 192 #ifdef DEBUG_PM
 193         printk("%s: completing PM request, %s\n", drive->name,
 194                (rq->cmd_type == REQ_TYPE_PM_SUSPEND) ? "suspend" : "resume");
 195 #endif
 196         spin_lock_irqsave(q->queue_lock, flags);
 197         if (rq->cmd_type == REQ_TYPE_PM_SUSPEND)
 198                 blk_stop_queue(q);
 199         else
 200                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 201         spin_unlock_irqrestore(q->queue_lock, flags);
 202
 203         drive->hwif->rq = NULL;
 204
 205         if (blk_end_request(rq, 0, 0))
 206                 BUG();
 207 }
 208
 209 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 210 {
 211         struct request_pm_state *pm = rq->special;
 212
 213         if (rq->cmd_type == REQ_TYPE_PM_SUSPEND &&
 214             pm->pm_step == IDE_PM_START_SUSPEND)
 215                 /* Mark drive blocked when starting the suspend sequence. */
 216                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 217         else if (rq->cmd_type == REQ_TYPE_PM_RESUME &&
 218                  pm->pm_step == IDE_PM_START_RESUME) {
 219                 /*
 220                  * The first thing we do on wakeup is to wait for BSY bit to
 221                  * go away (with a looong timeout) as a drive on this hwif may
 222                  * just be POSTing itself.
 223                  * We do that before even selecting as the "other" device on
 224                  * the bus may be broken enough to walk on our toes at this
 225                  * point.
 226                  */
 227                 ide_hwif_t *hwif = drive->hwif;
 228                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 229                 struct request_queue *q = drive->queue;
 230                 unsigned long flags;
 231                 int rc;
 232 #ifdef DEBUG_PM
 233                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 234 #endif
 235                 rc = ide_wait_not_busy(hwif, 35000);
 236                 if (rc)
 237                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 238                 tp_ops->dev_select(drive);
 239                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 240                 rc = ide_wait_not_busy(hwif, 100000);
 241                 if (rc)
 242                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 243
 244                 spin_lock_irqsave(q->queue_lock, flags);
 245                 blk_start_queue(q);
 246                 spin_unlock_irqrestore(q->queue_lock, flags);
 247         }
 248 }