| 1 | |
| 2 | |
| 3 | * Suspend/resume support
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| 4 | *
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| 5 | * Copyright 2009 MontaVista Software, Inc.
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| 6 | *
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| 7 | * Author: Anton Vorontsov <[email protected]>
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| 8 |
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| 9 |
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| 10 | #include <linux/init.h>
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| 11 | #include <linux/types.h>
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| 12 | #include <linux/errno.h>
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| 13 | #include <linux/export.h>
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| 14 | #include <linux/suspend.h>
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| 15 | #include <linux/delay.h>
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| 16 | #include <linux/of_address.h>
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| 17 | #include <linux/platform_device.h>
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| 18 |
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| 19 | struct pmc_regs {
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| 20 | __be32 devdisr;
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| 21 | __be32 devdisr2;
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| 22 | __be32 :32;
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| 23 | __be32 :32;
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| 24 | __be32 pmcsr;
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| 25 | #define PMCSR_SLP (1 << 17)
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| 26 | };
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| 27 |
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| 28 | static struct device *pmc_dev;
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| 29 | static struct pmc_regs __iomem *pmc_regs;
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| 30 |
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| 31 | static int pmc_suspend_enter(suspend_state_t state)
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| 32 | {
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| 33 | int ret;
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| 34 |
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| 35 | setbits32(&pmc_regs->pmcsr, PMCSR_SLP);
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| 36 |
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| 37 |
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| 38 |
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| 39 | ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0,
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| 40 | 10000, 10) ? 0 : -ETIMEDOUT;
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| 41 | if (ret)
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| 42 | dev_err(pmc_dev, "tired waiting for SLP bit to clear\n");
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| 43 | return ret;
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| 44 | }
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| 45 |
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| 46 | static int pmc_suspend_valid(suspend_state_t state)
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| 47 | {
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| 48 | if (state != PM_SUSPEND_STANDBY)
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| 49 | return 0;
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| 50 | return 1;
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| 51 | }
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| 52 |
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| 53 | static const struct platform_suspend_ops pmc_suspend_ops = {
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| 54 | .valid = pmc_suspend_valid,
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| 55 | .enter = pmc_suspend_enter,
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| 56 | };
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| 57 |
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| 58 | static int pmc_probe(struct platform_device *ofdev)
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| 59 | {
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| 60 | pmc_regs = of_iomap(ofdev->dev.of_node, 0);
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| 61 | if (!pmc_regs)
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| 62 | return -ENOMEM;
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| 63 |
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| 64 | pmc_dev = &ofdev->dev;
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| 65 | suspend_set_ops(&pmc_suspend_ops);
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| 66 | return 0;
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| 67 | }
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| 68 |
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| 69 | static const struct of_device_id pmc_ids[] = {
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| 70 | { .compatible = "fsl,mpc8548-pmc", },
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| 71 | { .compatible = "fsl,mpc8641d-pmc", },
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| 72 | { },
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| 73 | };
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| 74 |
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| 75 | static struct platform_driver pmc_driver = {
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| 76 | .driver = {
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| 77 | .name = "fsl-pmc",
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| 78 | .of_match_table = pmc_ids,
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| 79 | },
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| 80 | .probe = pmc_probe,
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| 81 | };
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| 82 |
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| 83 | builtin_platform_driver(pmc_driver);
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