+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/kernel.h>
-#include <linux/gfp.h>
-#include <linux/ide.h>
-
-int generic_ide_suspend(struct device *dev, pm_message_t mesg)
-{
- ide_drive_t *drive = to_ide_device(dev);
- ide_drive_t *pair = ide_get_pair_dev(drive);
- ide_hwif_t *hwif = drive->hwif;
- struct request *rq;
- struct ide_pm_state rqpm;
- int ret;
-
- if (ide_port_acpi(hwif)) {
- /* call ACPI _GTM only once */
- if ((drive->dn & 1) == 0 || pair == NULL)
- ide_acpi_get_timing(hwif);
- }
-
- memset(&rqpm, 0, sizeof(rqpm));
- rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
- ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
- ide_req(rq)->special = &rqpm;
- rqpm.pm_step = IDE_PM_START_SUSPEND;
- if (mesg.event == PM_EVENT_PRETHAW)
- mesg.event = PM_EVENT_FREEZE;
- rqpm.pm_state = mesg.event;
-
- blk_execute_rq(NULL, rq, 0);
- ret = scsi_req(rq)->result ? -EIO : 0;
- blk_put_request(rq);
-
- if (ret == 0 && ide_port_acpi(hwif)) {
- /* call ACPI _PS3 only after both devices are suspended */
- if ((drive->dn & 1) || pair == NULL)
- ide_acpi_set_state(hwif, 0);
- }
-
- return ret;
-}
-
-static int ide_pm_execute_rq(struct request *rq)
-{
- struct request_queue *q = rq->q;
-
- if (unlikely(blk_queue_dying(q))) {
- rq->rq_flags |= RQF_QUIET;
- scsi_req(rq)->result = -ENXIO;
- blk_mq_end_request(rq, BLK_STS_OK);
- return -ENXIO;
- }
- blk_execute_rq(NULL, rq, true);
-
- return scsi_req(rq)->result ? -EIO : 0;
-}
-
-int generic_ide_resume(struct device *dev)
-{
- ide_drive_t *drive = to_ide_device(dev);
- ide_drive_t *pair = ide_get_pair_dev(drive);
- ide_hwif_t *hwif = drive->hwif;
- struct request *rq;
- struct ide_pm_state rqpm;
- int err;
-
- blk_mq_start_stopped_hw_queues(drive->queue, true);
-
- if (ide_port_acpi(hwif)) {
- /* call ACPI _PS0 / _STM only once */
- if ((drive->dn & 1) == 0 || pair == NULL) {
- ide_acpi_set_state(hwif, 1);
- ide_acpi_push_timing(hwif);
- }
-
- ide_acpi_exec_tfs(drive);
- }
-
- memset(&rqpm, 0, sizeof(rqpm));
- rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_PM);
- ide_req(rq)->type = ATA_PRIV_PM_RESUME;
- ide_req(rq)->special = &rqpm;
- rqpm.pm_step = IDE_PM_START_RESUME;
- rqpm.pm_state = PM_EVENT_ON;
-
- err = ide_pm_execute_rq(rq);
- blk_put_request(rq);
-
- if (err == 0 && dev->driver) {
- struct ide_driver *drv = to_ide_driver(dev->driver);
-
- if (drv->resume)
- drv->resume(drive);
- }
-
- return err;
-}
-
-void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
-{
- struct ide_pm_state *pm = ide_req(rq)->special;
-
-#ifdef DEBUG_PM
- printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
- drive->name, pm->pm_step);
-#endif
- if (drive->media != ide_disk)
- return;
-
- switch (pm->pm_step) {
- case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
- if (pm->pm_state == PM_EVENT_FREEZE)
- pm->pm_step = IDE_PM_COMPLETED;
- else
- pm->pm_step = IDE_PM_STANDBY;
- break;
- case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
- pm->pm_step = IDE_PM_COMPLETED;
- break;
- case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
- pm->pm_step = IDE_PM_IDLE;
- break;
- case IDE_PM_IDLE: /* Resume step 2 (idle)*/
- pm->pm_step = IDE_PM_RESTORE_DMA;
- break;
- }
-}
-
-ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
-{
- struct ide_pm_state *pm = ide_req(rq)->special;
- struct ide_cmd cmd = { };
-
- switch (pm->pm_step) {
- case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
- if (drive->media != ide_disk)
- break;
- /* Not supported? Switch to next step now. */
- if (ata_id_flush_enabled(drive->id) == 0 ||
- (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
- ide_complete_power_step(drive, rq);
- return ide_stopped;
- }
- if (ata_id_flush_ext_enabled(drive->id))
- cmd.tf.command = ATA_CMD_FLUSH_EXT;
- else
- cmd.tf.command = ATA_CMD_FLUSH;
- goto out_do_tf;
- case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
- cmd.tf.command = ATA_CMD_STANDBYNOW1;
- goto out_do_tf;
- case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
- ide_set_max_pio(drive);
- /*
- * skip IDE_PM_IDLE for ATAPI devices
- */
- if (drive->media != ide_disk)
- pm->pm_step = IDE_PM_RESTORE_DMA;
- else
- ide_complete_power_step(drive, rq);
- return ide_stopped;
- case IDE_PM_IDLE: /* Resume step 2 (idle) */
- cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
- goto out_do_tf;
- case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
- /*
- * Right now, all we do is call ide_set_dma(drive),
- * we could be smarter and check for current xfer_speed
- * in struct drive etc...
- */
- if (drive->hwif->dma_ops == NULL)
- break;
- /*
- * TODO: respect IDE_DFLAG_USING_DMA
- */
- ide_set_dma(drive);
- break;
- }
-
- pm->pm_step = IDE_PM_COMPLETED;
-
- return ide_stopped;
-
-out_do_tf:
- cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
- cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
- cmd.protocol = ATA_PROT_NODATA;
-
- return do_rw_taskfile(drive, &cmd);
-}
-
-/**
- * ide_complete_pm_rq - end the current Power Management request
- * @drive: target drive
- * @rq: request
- *
- * This function cleans up the current PM request and stops the queue
- * if necessary.
- */
-void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
-{
- struct request_queue *q = drive->queue;
- struct ide_pm_state *pm = ide_req(rq)->special;
-
- ide_complete_power_step(drive, rq);
- if (pm->pm_step != IDE_PM_COMPLETED)
- return;
-
-#ifdef DEBUG_PM
- printk("%s: completing PM request, %s\n", drive->name,
- (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
-#endif
- if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
- blk_mq_stop_hw_queues(q);
- else
- drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
-
- drive->hwif->rq = NULL;
-
- blk_mq_end_request(rq, BLK_STS_OK);
-}
-
-void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
-{
- struct ide_pm_state *pm = ide_req(rq)->special;
-
- if (blk_rq_is_private(rq) &&
- ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
- pm->pm_step == IDE_PM_START_SUSPEND)
- /* Mark drive blocked when starting the suspend sequence. */
- drive->dev_flags |= IDE_DFLAG_BLOCKED;
- else if (blk_rq_is_private(rq) &&
- ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
- pm->pm_step == IDE_PM_START_RESUME) {
- /*
- * The first thing we do on wakeup is to wait for BSY bit to
- * go away (with a looong timeout) as a drive on this hwif may
- * just be POSTing itself.
- * We do that before even selecting as the "other" device on
- * the bus may be broken enough to walk on our toes at this
- * point.
- */
- ide_hwif_t *hwif = drive->hwif;
- const struct ide_tp_ops *tp_ops = hwif->tp_ops;
- struct request_queue *q = drive->queue;
- int rc;
-#ifdef DEBUG_PM
- printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
-#endif
- rc = ide_wait_not_busy(hwif, 35000);
- if (rc)
- printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
- tp_ops->dev_select(drive);
- tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
- rc = ide_wait_not_busy(hwif, 100000);
- if (rc)
- printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
-
- blk_mq_start_hw_queues(q);
- }
-}
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