1#include <linux/kernel.h>
2#include <linux/gfp.h>
3#include <linux/ide.h>
4
5int 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 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
41int generic_ide_resume(struct device *dev)
42{
43	ide_drive_t *drive = to_ide_device(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
81void 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
111ide_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
166out_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 */
182void 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
209void 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}
249