/* * Suspend/resume support * * Copyright 2009 MontaVista Software, Inc. * * Author: Anton Vorontsov <avorontsov@ru.mvista.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/init.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/suspend.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/of_platform.h> struct pmc_regs { __be32 devdisr; __be32 devdisr2; __be32 :32; __be32 :32; __be32 pmcsr; #define PMCSR_SLP (1 << 17) }; static struct device *pmc_dev; static struct pmc_regs __iomem *pmc_regs; static int pmc_suspend_enter(suspend_state_t state) { int ret; setbits32(&pmc_regs->pmcsr, PMCSR_SLP); /* At this point, the CPU is asleep. */ /* Upon resume, wait for SLP bit to be clear. */ ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0, 10000, 10) ? 0 : -ETIMEDOUT; if (ret) dev_err(pmc_dev, "tired waiting for SLP bit to clear\n"); return ret; } static int pmc_suspend_valid(suspend_state_t state) { if (state != PM_SUSPEND_STANDBY) return 0; return 1; } static struct platform_suspend_ops pmc_suspend_ops = { .valid = pmc_suspend_valid, .enter = pmc_suspend_enter, }; static int pmc_probe(struct of_device *ofdev, const struct of_device_id *id) { pmc_regs = of_iomap(ofdev->node, 0); if (!pmc_regs) return -ENOMEM; pmc_dev = &ofdev->dev; suspend_set_ops(&pmc_suspend_ops); return 0; } static const struct of_device_id pmc_ids[] = { { .compatible = "fsl,mpc8548-pmc", }, { .compatible = "fsl,mpc8641d-pmc", }, { }, }; static struct of_platform_driver pmc_driver = { .driver.name = "fsl-pmc", .match_table = pmc_ids, .probe = pmc_probe, }; static int __init pmc_init(void) { return of_register_platform_driver(&pmc_driver); } device_initcall(pmc_init);