• Russell King's avatar
    [ARM] Fix up initcall ordering · ac2c9c98
    Russell King authored
    ARM machine support gets initialised too late in the initialisation
    order and can cause some things to unexpectedly fail.  Fix the
    ordering of these initcalls by placing them in the core and arch
    initcall sections.
    ac2c9c98
pm.c 4.29 KB
/*
 * SA1100 Power Management Routines
 *
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 *
 * History:
 *
 * 2001-02-06:	Cliff Brake         Initial code
 *
 * 2001-02-25:	Sukjae Cho <sjcho@east.isi.edu> &
 * 		Chester Kuo <chester@linux.org.tw>
 * 			Save more value for the resume function! Support
 * 			Bitsy/Assabet/Freebird board
 *
 * 2001-08-29:	Nicolas Pitre <nico@cam.org>
 * 			Cleaned up, pushed platform dependent stuff
 * 			in the platform specific files.
 *
 * 2002-05-27:	Nicolas Pitre	Killed sleep.h and the kmalloced save array.
 * 				Storage is local on the stack now.
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/sysctl.h>
#include <linux/errno.h>
#include <linux/cpufreq.h>

#include <asm/hardware.h>
#include <asm/memory.h>
#include <asm/system.h>
#include <asm/leds.h>


/*
 * Debug macros
 */
#undef DEBUG

extern void sa1100_cpu_suspend(void);
extern void sa1100_cpu_resume(void);

#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]

/*
 * List of global SA11x0 peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * on the stack and then the stack pointer is stored last in sleep.S.
 */
enum {	SLEEP_SAVE_SP = 0,

	SLEEP_SAVE_OSCR, SLEEP_SAVE_OIER,
	SLEEP_SAVE_OSMR0, SLEEP_SAVE_OSMR1, SLEEP_SAVE_OSMR2, SLEEP_SAVE_OSMR3,

	SLEEP_SAVE_GPDR, SLEEP_SAVE_GRER, SLEEP_SAVE_GFER, SLEEP_SAVE_GAFR,
	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,

	SLEEP_SAVE_ICMR,
	SLEEP_SAVE_Ser1SDCR0,

	SLEEP_SAVE_SIZE
};


int pm_do_suspend(void)
{
	unsigned long sleep_save[SLEEP_SAVE_SIZE];

	local_irq_disable();

	leds_event(led_stop);

	/* preserve current time */
	RCNR = xtime.tv_sec;

	/* save vital registers */
	SAVE(OSCR);
	SAVE(OSMR0);
	SAVE(OSMR1);
	SAVE(OSMR2);
	SAVE(OSMR3);
	SAVE(OIER);

	SAVE(GPDR);
	SAVE(GRER);
	SAVE(GFER);
	SAVE(GAFR);

	SAVE(PPDR);
	SAVE(PPSR);
	SAVE(PPAR);
	SAVE(PSDR);

	SAVE(Ser1SDCR0);

	SAVE(ICMR);

	/* ... maybe a global variable initialized by arch code to set this? */
	GRER = PWER;
	GFER = 0;
	GEDR = GEDR;

	/* Clear previous reset status */
	RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;

	/* set resume return address */
	PSPR = virt_to_phys(sa1100_cpu_resume);

	/* go zzz */
	sa1100_cpu_suspend();

	/* ensure not to come back here if it wasn't intended */
	PSPR = 0;

#ifdef DEBUG
	printk(KERN_DEBUG "*** made it back from resume\n");
#endif

	/* restore registers */
	RESTORE(GPDR);
	RESTORE(GRER);
	RESTORE(GFER);
	RESTORE(GAFR);

	/* clear any edge detect bit */
	GEDR = GEDR;

	RESTORE(PPDR);
	RESTORE(PPSR);
	RESTORE(PPAR);
	RESTORE(PSDR);

	RESTORE(Ser1SDCR0);

	PSSR = PSSR_PH;

	RESTORE(OSMR0);
	RESTORE(OSMR1);
	RESTORE(OSMR2);
	RESTORE(OSMR3);
	RESTORE(OSCR);
	RESTORE(OIER);

	ICLR = 0;
	ICCR = 1;
	RESTORE(ICMR);

	/* restore current time */
	xtime.tv_sec = RCNR;

	leds_event(led_start);

	local_irq_enable();

	/*
	 * Restore the CPU frequency settings.
	 */
#ifdef CONFIG_CPU_FREQ
	cpufreq_restore();
#endif

	return 0;
}

unsigned long sleep_phys_sp(void *sp)
{
	return virt_to_phys(sp);
}

#ifdef CONFIG_SYSCTL
/*
 * ARGH!  ACPI people defined CTL_ACPI in linux/acpi.h rather than
 * linux/sysctl.h.
 *
 * This means our interface here won't survive long - it needs a new
 * interface.  Quick hack to get this working - use sysctl id 9999.
 */
#warning ACPI broke the kernel, this interface needs to be fixed up.
#define CTL_ACPI 9999
#define ACPI_S1_SLP_TYP 19

/*
 * Send us to sleep.
 */
static int sysctl_pm_do_suspend(void)
{
	int retval;

	retval = pm_send_all(PM_SUSPEND, (void *)3);

	if (retval == 0) {
		retval = pm_do_suspend();

		pm_send_all(PM_RESUME, (void *)0);
	}

	return retval;
}

static struct ctl_table pm_table[] =
{
	{ACPI_S1_SLP_TYP, "suspend", NULL, 0, 0600, NULL, (proc_handler *)&sysctl_pm_do_suspend},
	{0}
};

static struct ctl_table pm_dir_table[] =
{
	{CTL_ACPI, "pm", NULL, 0, 0555, pm_table},
	{0}
};

/*
 * Initialize power interface
 */
static int __init pm_init(void)
{
	register_sysctl_table(pm_dir_table, 1);
	return 0;
}

fs_initcall(pm_init);

#endif

EXPORT_SYMBOL(pm_do_suspend);