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Commit 4ffd6952 authored by Anton Vorontsov's avatar Anton Vorontsov Committed by Kumar Gala
Browse files

powerpc/85xx/86xx: Add suspend/resume support 



This patch adds suspend/resume support for MPC8540 and MPC8641D-
compatible CPUs. To reach sleep state, we just write the SLP bit
into the PM control and status register.

So far we don't support Deep Sleep mode as found in newer MPC85xx
CPUs (i.e. MPC8536). It can be relatively easy implemented though,
and for it we reserve 'mem' suspend type.

Signed-off-by: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent fdfde24e

arch/powerpc/Kconfig

+10 −1
Original line number Diff line number Diff line
@@ -215,7 +215,8 @@ config ARCH_HIBERNATION_POSSIBLE 


config ARCH_SUSPEND_POSSIBLE

	def_bool y

	depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx

	depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \

		   PPC_85xx || PPC_86xx



config PPC_DCR_NATIVE

	bool
@@ -664,6 +665,14 @@ config FSL_PCI 
	select PPC_INDIRECT_PCI

	select PCI_QUIRKS



config FSL_PMC

	bool

	default y

	depends on SUSPEND && (PPC_85xx || PPC_86xx)

	help

	  Freescale MPC85xx/MPC86xx power management controller support

	  (suspend/resume). For MPC83xx see platforms/83xx/suspend.c



config 4xx_SOC

	bool

arch/powerpc/sysdev/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ obj-$(CONFIG_U3_DART) += dart_iommu.o 
obj-$(CONFIG_MMIO_NVRAM)	+= mmio_nvram.o

obj-$(CONFIG_FSL_SOC)		+= fsl_soc.o

obj-$(CONFIG_FSL_PCI)		+= fsl_pci.o $(fsl-msi-obj-y)

obj-$(CONFIG_FSL_PMC)		+= fsl_pmc.o

obj-$(CONFIG_FSL_LBC)		+= fsl_lbc.o

obj-$(CONFIG_FSL_GTM)		+= fsl_gtm.o

obj-$(CONFIG_MPC8xxx_GPIO)	+= mpc8xxx_gpio.o

arch/powerpc/sysdev/fsl_pmc.c

0 → 100644
+88 −0
Original line number Diff line number Diff line 
/*

 * 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);