diff options
Diffstat (limited to 'arch/powerpc/sysdev/fsl_pmc.c')
-rw-r--r-- | arch/powerpc/sysdev/fsl_pmc.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_pmc.c b/arch/powerpc/sysdev/fsl_pmc.c new file mode 100644 index 0000000..a7635a9 --- /dev/null +++ b/arch/powerpc/sysdev/fsl_pmc.c @@ -0,0 +1,88 @@ +/* + * 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); |