Commit | Line | Data |
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4ffd6952 AV |
1 | /* |
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> | |
66b15db6 | 17 | #include <linux/export.h> |
4ffd6952 AV |
18 | #include <linux/suspend.h> |
19 | #include <linux/delay.h> | |
20 | #include <linux/device.h> | |
26a2056e | 21 | #include <linux/of_address.h> |
4ffd6952 AV |
22 | #include <linux/of_platform.h> |
23 | ||
24 | struct 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 | ||
33 | static struct device *pmc_dev; | |
34 | static struct pmc_regs __iomem *pmc_regs; | |
35 | ||
36 | static 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 | ||
51 | static int pmc_suspend_valid(suspend_state_t state) | |
52 | { | |
53 | if (state != PM_SUSPEND_STANDBY) | |
54 | return 0; | |
55 | return 1; | |
56 | } | |
57 | ||
2f55ac07 | 58 | static const struct platform_suspend_ops pmc_suspend_ops = { |
4ffd6952 AV |
59 | .valid = pmc_suspend_valid, |
60 | .enter = pmc_suspend_enter, | |
61 | }; | |
62 | ||
00006124 | 63 | static int pmc_probe(struct platform_device *ofdev) |
4ffd6952 | 64 | { |
61c7a080 | 65 | pmc_regs = of_iomap(ofdev->dev.of_node, 0); |
4ffd6952 AV |
66 | if (!pmc_regs) |
67 | return -ENOMEM; | |
68 | ||
69 | pmc_dev = &ofdev->dev; | |
70 | suspend_set_ops(&pmc_suspend_ops); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static const struct of_device_id pmc_ids[] = { | |
75 | { .compatible = "fsl,mpc8548-pmc", }, | |
76 | { .compatible = "fsl,mpc8641d-pmc", }, | |
77 | { }, | |
78 | }; | |
79 | ||
00006124 | 80 | static struct platform_driver pmc_driver = { |
4018294b GL |
81 | .driver = { |
82 | .name = "fsl-pmc", | |
4018294b GL |
83 | .of_match_table = pmc_ids, |
84 | }, | |
4ffd6952 AV |
85 | .probe = pmc_probe, |
86 | }; | |
87 | ||
88 | static int __init pmc_init(void) | |
89 | { | |
00006124 | 90 | return platform_driver_register(&pmc_driver); |
4ffd6952 AV |
91 | } |
92 | device_initcall(pmc_init); |