ide-pm.c revision 22aa4b32a19b1f231d4ce7e9af6354b577a22a35
1#include <linux/kernel.h> 2#include <linux/ide.h> 3#include <linux/hdreg.h> 4 5int generic_ide_suspend(struct device *dev, pm_message_t mesg) 6{ 7 ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive); 8 ide_hwif_t *hwif = drive->hwif; 9 struct request *rq; 10 struct request_pm_state rqpm; 11 struct ide_cmd cmd; 12 int ret; 13 14 /* call ACPI _GTM only once */ 15 if ((drive->dn & 1) == 0 || pair == NULL) 16 ide_acpi_get_timing(hwif); 17 18 memset(&rqpm, 0, sizeof(rqpm)); 19 memset(&cmd, 0, sizeof(cmd)); 20 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 21 rq->cmd_type = REQ_TYPE_PM_SUSPEND; 22 rq->special = &cmd; 23 rq->data = &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 /* call ACPI _PS3 only after both devices are suspended */ 33 if (ret == 0 && ((drive->dn & 1) || pair == NULL)) 34 ide_acpi_set_state(hwif, 0); 35 36 return ret; 37} 38 39int generic_ide_resume(struct device *dev) 40{ 41 ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive); 42 ide_hwif_t *hwif = drive->hwif; 43 struct request *rq; 44 struct request_pm_state rqpm; 45 struct ide_cmd cmd; 46 int err; 47 48 /* call ACPI _PS0 / _STM only once */ 49 if ((drive->dn & 1) == 0 || pair == NULL) { 50 ide_acpi_set_state(hwif, 1); 51 ide_acpi_push_timing(hwif); 52 } 53 54 ide_acpi_exec_tfs(drive); 55 56 memset(&rqpm, 0, sizeof(rqpm)); 57 memset(&cmd, 0, sizeof(cmd)); 58 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 59 rq->cmd_type = REQ_TYPE_PM_RESUME; 60 rq->cmd_flags |= REQ_PREEMPT; 61 rq->special = &cmd; 62 rq->data = &rqpm; 63 rqpm.pm_step = IDE_PM_START_RESUME; 64 rqpm.pm_state = PM_EVENT_ON; 65 66 err = blk_execute_rq(drive->queue, NULL, rq, 1); 67 blk_put_request(rq); 68 69 if (err == 0 && dev->driver) { 70 struct ide_driver *drv = to_ide_driver(dev->driver); 71 72 if (drv->resume) 73 drv->resume(drive); 74 } 75 76 return err; 77} 78 79void ide_complete_power_step(ide_drive_t *drive, struct request *rq) 80{ 81 struct request_pm_state *pm = rq->data; 82 83#ifdef DEBUG_PM 84 printk(KERN_INFO "%s: complete_power_step(step: %d)\n", 85 drive->name, pm->pm_step); 86#endif 87 if (drive->media != ide_disk) 88 return; 89 90 switch (pm->pm_step) { 91 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ 92 if (pm->pm_state == PM_EVENT_FREEZE) 93 pm->pm_step = IDE_PM_COMPLETED; 94 else 95 pm->pm_step = IDE_PM_STANDBY; 96 break; 97 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ 98 pm->pm_step = IDE_PM_COMPLETED; 99 break; 100 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ 101 pm->pm_step = IDE_PM_IDLE; 102 break; 103 case IDE_PM_IDLE: /* Resume step 2 (idle)*/ 104 pm->pm_step = IDE_PM_RESTORE_DMA; 105 break; 106 } 107} 108 109ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) 110{ 111 struct request_pm_state *pm = rq->data; 112 struct ide_cmd *cmd = rq->special; 113 114 memset(cmd, 0, sizeof(*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 166out_do_tf: 167 cmd->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; 168 cmd->data_phase = TASKFILE_NO_DATA; 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 */ 181void 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->data; 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 208void ide_check_pm_state(ide_drive_t *drive, struct request *rq) 209{ 210 struct request_pm_state *pm = rq->data; 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 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 SELECT_DRIVE(drive); 237 hwif->tp_ops->set_irq(hwif, 1); 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} 247