blob: 1d6fd7c59fe9f20cdf6f07f2512741a0f59be1d1 [file] [log] [blame]
Anton Vorontsov4ffd6952009-09-16 01:43:57 +04001/*
2 * Suspend/resume support
3 *
4 * Copyright 2009 MontaVista Software, Inc.
5 *
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/errno.h>
Paul Gortmaker66b15db2011-05-27 10:46:24 -040017#include <linux/export.h>
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040018#include <linux/suspend.h>
19#include <linux/delay.h>
20#include <linux/device.h>
Rob Herring26a20562013-09-26 07:40:04 -050021#include <linux/of_address.h>
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040022#include <linux/of_platform.h>
23
24struct pmc_regs {
25 __be32 devdisr;
26 __be32 devdisr2;
27 __be32 :32;
28 __be32 :32;
29 __be32 pmcsr;
30#define PMCSR_SLP (1 << 17)
31};
32
33static struct device *pmc_dev;
34static struct pmc_regs __iomem *pmc_regs;
35
36static int pmc_suspend_enter(suspend_state_t state)
37{
38 int ret;
39
40 setbits32(&pmc_regs->pmcsr, PMCSR_SLP);
41 /* At this point, the CPU is asleep. */
42
43 /* Upon resume, wait for SLP bit to be clear. */
44 ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0,
45 10000, 10) ? 0 : -ETIMEDOUT;
46 if (ret)
47 dev_err(pmc_dev, "tired waiting for SLP bit to clear\n");
48 return ret;
49}
50
51static int pmc_suspend_valid(suspend_state_t state)
52{
53 if (state != PM_SUSPEND_STANDBY)
54 return 0;
55 return 1;
56}
57
Lionel Debroux2f55ac02010-11-16 14:14:02 +010058static const struct platform_suspend_ops pmc_suspend_ops = {
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040059 .valid = pmc_suspend_valid,
60 .enter = pmc_suspend_enter,
61};
62
Grant Likely00006122011-02-22 19:59:54 -070063static int pmc_probe(struct platform_device *ofdev)
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040064{
Grant Likely61c7a082010-04-13 16:12:29 -070065 pmc_regs = of_iomap(ofdev->dev.of_node, 0);
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040066 if (!pmc_regs)
67 return -ENOMEM;
68
69 pmc_dev = &ofdev->dev;
70 suspend_set_ops(&pmc_suspend_ops);
71 return 0;
72}
73
74static const struct of_device_id pmc_ids[] = {
75 { .compatible = "fsl,mpc8548-pmc", },
76 { .compatible = "fsl,mpc8641d-pmc", },
77 { },
78};
79
Grant Likely00006122011-02-22 19:59:54 -070080static struct platform_driver pmc_driver = {
Grant Likely40182942010-04-13 16:13:02 -070081 .driver = {
82 .name = "fsl-pmc",
Grant Likely40182942010-04-13 16:13:02 -070083 .of_match_table = pmc_ids,
84 },
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040085 .probe = pmc_probe,
86};
87
88static int __init pmc_init(void)
89{
Grant Likely00006122011-02-22 19:59:54 -070090 return platform_driver_register(&pmc_driver);
Anton Vorontsov4ffd6952009-09-16 01:43:57 +040091}
92device_initcall(pmc_init);