ide-pm.c revision fcb5207723919ad85178420633d55efea80b652d
1#include <linux/kernel.h> 2#include <linux/ide.h> 3 4int 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 /* 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 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 19 rq->cmd_type = REQ_TYPE_PM_SUSPEND; 20 rq->special = &rqpm; 21 rqpm.pm_step = IDE_PM_START_SUSPEND; 22 if (mesg.event == PM_EVENT_PRETHAW) 23 mesg.event = PM_EVENT_FREEZE; 24 rqpm.pm_state = mesg.event; 25 26 ret = blk_execute_rq(drive->queue, NULL, rq, 0); 27 blk_put_request(rq); 28 29 /* call ACPI _PS3 only after both devices are suspended */ 30 if (ret == 0 && ((drive->dn & 1) || pair == NULL)) 31 ide_acpi_set_state(hwif, 0); 32 33 return ret; 34} 35 36int generic_ide_resume(struct device *dev) 37{ 38 ide_drive_t *drive = dev_get_drvdata(dev); 39 ide_drive_t *pair = ide_get_pair_dev(drive); 40 ide_hwif_t *hwif = drive->hwif; 41 struct request *rq; 42 struct request_pm_state rqpm; 43 int err; 44 45 /* call ACPI _PS0 / _STM only once */ 46 if ((drive->dn & 1) == 0 || pair == NULL) { 47 ide_acpi_set_state(hwif, 1); 48 ide_acpi_push_timing(hwif); 49 } 50 51 ide_acpi_exec_tfs(drive); 52 53 memset(&rqpm, 0, sizeof(rqpm)); 54 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 55 rq->cmd_type = REQ_TYPE_PM_RESUME; 56 rq->cmd_flags |= REQ_PREEMPT; 57 rq->special = &rqpm; 58 rqpm.pm_step = IDE_PM_START_RESUME; 59 rqpm.pm_state = PM_EVENT_ON; 60 61 err = blk_execute_rq(drive->queue, NULL, rq, 1); 62 blk_put_request(rq); 63 64 if (err == 0 && dev->driver) { 65 struct ide_driver *drv = to_ide_driver(dev->driver); 66 67 if (drv->resume) 68 drv->resume(drive); 69 } 70 71 return err; 72} 73 74void ide_complete_power_step(ide_drive_t *drive, struct request *rq) 75{ 76 struct request_pm_state *pm = rq->special; 77 78#ifdef DEBUG_PM 79 printk(KERN_INFO "%s: complete_power_step(step: %d)\n", 80 drive->name, pm->pm_step); 81#endif 82 if (drive->media != ide_disk) 83 return; 84 85 switch (pm->pm_step) { 86 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ 87 if (pm->pm_state == PM_EVENT_FREEZE) 88 pm->pm_step = IDE_PM_COMPLETED; 89 else 90 pm->pm_step = IDE_PM_STANDBY; 91 break; 92 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ 93 pm->pm_step = IDE_PM_COMPLETED; 94 break; 95 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ 96 pm->pm_step = IDE_PM_IDLE; 97 break; 98 case IDE_PM_IDLE: /* Resume step 2 (idle)*/ 99 pm->pm_step = IDE_PM_RESTORE_DMA; 100 break; 101 } 102} 103 104ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) 105{ 106 struct request_pm_state *pm = rq->special; 107 struct ide_cmd cmd = { }; 108 109 switch (pm->pm_step) { 110 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ 111 if (drive->media != ide_disk) 112 break; 113 /* Not supported? Switch to next step now. */ 114 if (ata_id_flush_enabled(drive->id) == 0 || 115 (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { 116 ide_complete_power_step(drive, rq); 117 return ide_stopped; 118 } 119 if (ata_id_flush_ext_enabled(drive->id)) 120 cmd.tf.command = ATA_CMD_FLUSH_EXT; 121 else 122 cmd.tf.command = ATA_CMD_FLUSH; 123 goto out_do_tf; 124 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ 125 cmd.tf.command = ATA_CMD_STANDBYNOW1; 126 goto out_do_tf; 127 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ 128 ide_set_max_pio(drive); 129 /* 130 * skip IDE_PM_IDLE for ATAPI devices 131 */ 132 if (drive->media != ide_disk) 133 pm->pm_step = IDE_PM_RESTORE_DMA; 134 else 135 ide_complete_power_step(drive, rq); 136 return ide_stopped; 137 case IDE_PM_IDLE: /* Resume step 2 (idle) */ 138 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE; 139 goto out_do_tf; 140 case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ 141 /* 142 * Right now, all we do is call ide_set_dma(drive), 143 * we could be smarter and check for current xfer_speed 144 * in struct drive etc... 145 */ 146 if (drive->hwif->dma_ops == NULL) 147 break; 148 /* 149 * TODO: respect IDE_DFLAG_USING_DMA 150 */ 151 ide_set_dma(drive); 152 break; 153 } 154 155 pm->pm_step = IDE_PM_COMPLETED; 156 157 return ide_stopped; 158 159out_do_tf: 160 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; 161 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; 162 cmd.protocol = ATA_PROT_NODATA; 163 164 return do_rw_taskfile(drive, &cmd); 165} 166 167/** 168 * ide_complete_pm_rq - end the current Power Management request 169 * @drive: target drive 170 * @rq: request 171 * 172 * This function cleans up the current PM request and stops the queue 173 * if necessary. 174 */ 175void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq) 176{ 177 struct request_queue *q = drive->queue; 178 struct request_pm_state *pm = rq->special; 179 unsigned long flags; 180 181 ide_complete_power_step(drive, rq); 182 if (pm->pm_step != IDE_PM_COMPLETED) 183 return; 184 185#ifdef DEBUG_PM 186 printk("%s: completing PM request, %s\n", drive->name, 187 blk_pm_suspend_request(rq) ? "suspend" : "resume"); 188#endif 189 spin_lock_irqsave(q->queue_lock, flags); 190 if (blk_pm_suspend_request(rq)) 191 blk_stop_queue(q); 192 else 193 drive->dev_flags &= ~IDE_DFLAG_BLOCKED; 194 spin_unlock_irqrestore(q->queue_lock, flags); 195 196 drive->hwif->rq = NULL; 197 198 if (blk_end_request(rq, 0, 0)) 199 BUG(); 200} 201 202void ide_check_pm_state(ide_drive_t *drive, struct request *rq) 203{ 204 struct request_pm_state *pm = rq->special; 205 206 if (blk_pm_suspend_request(rq) && 207 pm->pm_step == IDE_PM_START_SUSPEND) 208 /* Mark drive blocked when starting the suspend sequence. */ 209 drive->dev_flags |= IDE_DFLAG_BLOCKED; 210 else if (blk_pm_resume_request(rq) && 211 pm->pm_step == IDE_PM_START_RESUME) { 212 /* 213 * The first thing we do on wakeup is to wait for BSY bit to 214 * go away (with a looong timeout) as a drive on this hwif may 215 * just be POSTing itself. 216 * We do that before even selecting as the "other" device on 217 * the bus may be broken enough to walk on our toes at this 218 * point. 219 */ 220 ide_hwif_t *hwif = drive->hwif; 221 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 222 struct request_queue *q = drive->queue; 223 unsigned long flags; 224 int rc; 225#ifdef DEBUG_PM 226 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); 227#endif 228 rc = ide_wait_not_busy(hwif, 35000); 229 if (rc) 230 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); 231 tp_ops->dev_select(drive); 232 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); 233 rc = ide_wait_not_busy(hwif, 100000); 234 if (rc) 235 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); 236 237 spin_lock_irqsave(q->queue_lock, flags); 238 blk_start_queue(q); 239 spin_unlock_irqrestore(q->queue_lock, flags); 240 } 241} 242