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 = to_ide_device(dev);
   8         ide_drive_t *pair = ide_get_pair_dev(drive);
   9         ide_hwif_t *hwif = drive->hwif;
  10         struct request *rq;
  11         struct ide_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_ATA_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 static void ide_end_sync_rq(struct request *rq, int error)
  42 {
  43         complete(rq->end_io_data);
  44 }
  45
  46 static int ide_pm_execute_rq(struct request *rq)
  47 {
  48         struct request_queue *q = rq->q;
  49         DECLARE_COMPLETION_ONSTACK(wait);
  50
  51         rq->end_io_data = &wait;
  52         rq->end_io = ide_end_sync_rq;
  53
  54         spin_lock_irq(q->queue_lock);
  55         if (unlikely(blk_queue_dying(q))) {
  56                 rq->cmd_flags |= REQ_QUIET;
  57                 rq->errors = -ENXIO;
  58                 __blk_end_request_all(rq, rq->errors);
  59                 spin_unlock_irq(q->queue_lock);
  60                 return -ENXIO;
  61         }
  62         __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
  63         __blk_run_queue_uncond(q);
  64         spin_unlock_irq(q->queue_lock);
  65
  66         wait_for_completion_io(&wait);
  67
  68         return rq->errors ? -EIO : 0;
  69 }
  70
  71 int generic_ide_resume(struct device *dev)
  72 {
  73         ide_drive_t *drive = to_ide_device(dev);
  74         ide_drive_t *pair = ide_get_pair_dev(drive);
  75         ide_hwif_t *hwif = drive->hwif;
  76         struct request *rq;
  77         struct ide_pm_state rqpm;
  78         int err;
  79
  80         if (ide_port_acpi(hwif)) {
  81                 /* call ACPI _PS0 / _STM only once */
  82                 if ((drive->dn & 1) == 0 || pair == NULL) {
  83                         ide_acpi_set_state(hwif, 1);
  84                         ide_acpi_push_timing(hwif);
  85                 }
  86
  87                 ide_acpi_exec_tfs(drive);
  88         }
  89
  90         memset(&rqpm, 0, sizeof(rqpm));
  91         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
  92         rq->cmd_type = REQ_TYPE_ATA_PM_RESUME;
  93         rq->cmd_flags |= REQ_PREEMPT;
  94         rq->special = &rqpm;
  95         rqpm.pm_step = IDE_PM_START_RESUME;
  96         rqpm.pm_state = PM_EVENT_ON;
  97
  98         err = ide_pm_execute_rq(rq);
  99         blk_put_request(rq);
 100
 101         if (err == 0 && dev->driver) {
 102                 struct ide_driver *drv = to_ide_driver(dev->driver);
 103
 104                 if (drv->resume)
 105                         drv->resume(drive);
 106         }
 107
 108         return err;
 109 }
 110
 111 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
 112 {
 113         struct ide_pm_state *pm = rq->special;
 114
 115 #ifdef DEBUG_PM
 116         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
 117                 drive->name, pm->pm_step);
 118 #endif
 119         if (drive->media != ide_disk)
 120                 return;
 121
 122         switch (pm->pm_step) {
 123         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 124                 if (pm->pm_state == PM_EVENT_FREEZE)
 125                         pm->pm_step = IDE_PM_COMPLETED;
 126                 else
 127                         pm->pm_step = IDE_PM_STANDBY;
 128                 break;
 129         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 130                 pm->pm_step = IDE_PM_COMPLETED;
 131                 break;
 132         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 133                 pm->pm_step = IDE_PM_IDLE;
 134                 break;
 135         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 136                 pm->pm_step = IDE_PM_RESTORE_DMA;
 137                 break;
 138         }
 139 }
 140
 141 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 142 {
 143         struct ide_pm_state *pm = rq->special;
 144         struct ide_cmd cmd = { };
 145
 146         switch (pm->pm_step) {
 147         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 148                 if (drive->media != ide_disk)
 149                         break;
 150                 /* Not supported? Switch to next step now. */
 151                 if (ata_id_flush_enabled(drive->id) == 0 ||
 152                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 153                         ide_complete_power_step(drive, rq);
 154                         return ide_stopped;
 155                 }
 156                 if (ata_id_flush_ext_enabled(drive->id))
 157                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
 158                 else
 159                         cmd.tf.command = ATA_CMD_FLUSH;
 160                 goto out_do_tf;
 161         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 162                 cmd.tf.command = ATA_CMD_STANDBYNOW1;
 163                 goto out_do_tf;
 164         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 165                 ide_set_max_pio(drive);
 166                 /*
 167                  * skip IDE_PM_IDLE for ATAPI devices
 168                  */
 169                 if (drive->media != ide_disk)
 170                         pm->pm_step = IDE_PM_RESTORE_DMA;
 171                 else
 172                         ide_complete_power_step(drive, rq);
 173                 return ide_stopped;
 174         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 175                 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
 176                 goto out_do_tf;
 177         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 178                 /*
 179                  * Right now, all we do is call ide_set_dma(drive),
 180                  * we could be smarter and check for current xfer_speed
 181                  * in struct drive etc...
 182                  */
 183                 if (drive->hwif->dma_ops == NULL)
 184                         break;
 185                 /*
 186                  * TODO: respect IDE_DFLAG_USING_DMA
 187                  */
 188                 ide_set_dma(drive);
 189                 break;
 190         }
 191
 192         pm->pm_step = IDE_PM_COMPLETED;
 193
 194         return ide_stopped;
 195
 196 out_do_tf:
 197         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 198         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 199         cmd.protocol = ATA_PROT_NODATA;
 200
 201         return do_rw_taskfile(drive, &cmd);
 202 }
 203
 204 /**
 205  *      ide_complete_pm_rq - end the current Power Management request
 206  *      @drive: target drive
 207  *      @rq: request
 208  *
 209  *      This function cleans up the current PM request and stops the queue
 210  *      if necessary.
 211  */
 212 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 213 {
 214         struct request_queue *q = drive->queue;
 215         struct ide_pm_state *pm = rq->special;
 216         unsigned long flags;
 217
 218         ide_complete_power_step(drive, rq);
 219         if (pm->pm_step != IDE_PM_COMPLETED)
 220                 return;
 221
 222 #ifdef DEBUG_PM
 223         printk("%s: completing PM request, %s\n", drive->name,
 224                (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) ? "suspend" : "resume");
 225 #endif
 226         spin_lock_irqsave(q->queue_lock, flags);
 227         if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND)
 228                 blk_stop_queue(q);
 229         else
 230                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 231         spin_unlock_irqrestore(q->queue_lock, flags);
 232
 233         drive->hwif->rq = NULL;
 234
 235         if (blk_end_request(rq, 0, 0))
 236                 BUG();
 237 }
 238
 239 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 240 {
 241         struct ide_pm_state *pm = rq->special;
 242
 243         if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND &&
 244             pm->pm_step == IDE_PM_START_SUSPEND)
 245                 /* Mark drive blocked when starting the suspend sequence. */
 246                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 247         else if (rq->cmd_type == REQ_TYPE_ATA_PM_RESUME &&
 248                  pm->pm_step == IDE_PM_START_RESUME) {
 249                 /*
 250                  * The first thing we do on wakeup is to wait for BSY bit to
 251                  * go away (with a looong timeout) as a drive on this hwif may
 252                  * just be POSTing itself.
 253                  * We do that before even selecting as the "other" device on
 254                  * the bus may be broken enough to walk on our toes at this
 255                  * point.
 256                  */
 257                 ide_hwif_t *hwif = drive->hwif;
 258                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 259                 struct request_queue *q = drive->queue;
 260                 unsigned long flags;
 261                 int rc;
 262 #ifdef DEBUG_PM
 263                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 264 #endif
 265                 rc = ide_wait_not_busy(hwif, 35000);
 266                 if (rc)
 267                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 268                 tp_ops->dev_select(drive);
 269                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 270                 rc = ide_wait_not_busy(hwif, 100000);
 271                 if (rc)
 272                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 273
 274                 spin_lock_irqsave(q->queue_lock, flags);
 275                 blk_start_queue(q);
 276                 spin_unlock_irqrestore(q->queue_lock, flags);
 277         }
 278 }