[thirdparty/linux.git] / arch / arm / mach-pnx4008 / pm.c

/*
 * arch/arm/mach-pnx4008/pm.c
 *
 * Power Management driver for PNX4008
 *
 * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
 *
 * 2005 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/pm.h>
#include <linux/rtc.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/suspend.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <asm/cacheflush.h>
#include <mach/pm.h>
#include <mach/clock.h>

#define SRAM_VA IO_ADDRESS(PNX4008_IRAM_BASE)

static void *saved_sram;

static struct clk *pll4_clk;

static inline void pnx4008_standby(void)
{
	void (*pnx4008_cpu_standby_ptr) (void);

	local_irq_disable();
	local_fiq_disable();

	clk_disable(pll4_clk);

	/*saving portion of SRAM to be used by suspend function. */
	memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_standby_sz);

	/*make sure SRAM copy gets physically written into SDRAM.
	   SDRAM will be placed into self-refresh during power down */
	flush_cache_all();

	/*copy suspend function into SRAM */
	memcpy((void *)SRAM_VA, pnx4008_cpu_standby, pnx4008_cpu_standby_sz);

	/*do suspend */
	pnx4008_cpu_standby_ptr = (void *)SRAM_VA;
	pnx4008_cpu_standby_ptr();

	/*restoring portion of SRAM that was used by suspend function */
	memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_standby_sz);

	clk_enable(pll4_clk);

	local_fiq_enable();
	local_irq_enable();
}

static inline void pnx4008_suspend(void)
{
	void (*pnx4008_cpu_suspend_ptr) (void);

	local_irq_disable();
	local_fiq_disable();

	clk_disable(pll4_clk);

	__raw_writel(0xffffffff, START_INT_RSR_REG(SE_PIN_BASE_INT));
	__raw_writel(0xffffffff, START_INT_RSR_REG(SE_INT_BASE_INT));

	/*saving portion of SRAM to be used by suspend function. */
	memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_suspend_sz);

	/*make sure SRAM copy gets physically written into SDRAM.
	   SDRAM will be placed into self-refresh during power down */
	flush_cache_all();

	/*copy suspend function into SRAM */
	memcpy((void *)SRAM_VA, pnx4008_cpu_suspend, pnx4008_cpu_suspend_sz);

	/*do suspend */
	pnx4008_cpu_suspend_ptr = (void *)SRAM_VA;
	pnx4008_cpu_suspend_ptr();

	/*restoring portion of SRAM that was used by suspend function */
	memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_suspend_sz);

	clk_enable(pll4_clk);

	local_fiq_enable();
	local_irq_enable();
}

static int pnx4008_pm_enter(suspend_state_t state)
{
	switch (state) {
	case PM_SUSPEND_STANDBY:
		pnx4008_standby();
		break;
	case PM_SUSPEND_MEM:
		pnx4008_suspend();
		break;
	}
	return 0;
}

static int pnx4008_pm_valid(suspend_state_t state)
{
	return (state == PM_SUSPEND_STANDBY) ||
	       (state == PM_SUSPEND_MEM);
}

static struct platform_suspend_ops pnx4008_pm_ops = {
	.enter = pnx4008_pm_enter,
	.valid = pnx4008_pm_valid,
};

static int __init pnx4008_pm_init(void)
{
	u32 sram_size_to_allocate;

	pll4_clk = clk_get(0, "ck_pll4");
	if (IS_ERR(pll4_clk)) {
		printk(KERN_ERR
		       "PM Suspend cannot acquire ARM(PLL4) clock control\n");
		return PTR_ERR(pll4_clk);
	}

	if (pnx4008_cpu_standby_sz > pnx4008_cpu_suspend_sz)
		sram_size_to_allocate = pnx4008_cpu_standby_sz;
	else
		sram_size_to_allocate = pnx4008_cpu_suspend_sz;

	saved_sram = kmalloc(sram_size_to_allocate, GFP_ATOMIC);
	if (!saved_sram) {
		printk(KERN_ERR
		       "PM Suspend: cannot allocate memory to save portion of SRAM\n");
		clk_put(pll4_clk);
		return -ENOMEM;
	}

	suspend_set_ops(&pnx4008_pm_ops);
	return 0;
}

late_initcall(pnx4008_pm_init);
Commit	Line	Data
78818e47 VW	1	/*
	2	* arch/arm/mach-pnx4008/pm.c
	3	*
	4	* Power Management driver for PNX4008
	5	*
	6	* Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
	7	*
	8	* 2005 (c) MontaVista Software, Inc. This file is licensed under
	9	* the terms of the GNU General Public License version 2. This program
	10	* is licensed "as is" without any warranty of any kind, whether express
	11	* or implied.
	12	*/
	13
	14	#include <linux/pm.h>
	15	#include <linux/rtc.h>
	16	#include <linux/sched.h>
	17	#include <linux/proc_fs.h>
95d9ffbe	18	#include <linux/suspend.h>
78818e47 VW	19	#include <linux/delay.h>
78818e47 VW	20	#include <linux/clk.h>
fced80c7	21	#include <linux/io.h>
78818e47	22
78818e47	23	#include <asm/cacheflush.h>
a09e64fb RK	24	#include <mach/pm.h>
a09e64fb RK	25	#include <mach/clock.h>
78818e47 VW	26
	27	#define SRAM_VA IO_ADDRESS(PNX4008_IRAM_BASE)
	28
	29	static void *saved_sram;
	30
	31	static struct clk *pll4_clk;
	32
	33	static inline void pnx4008_standby(void)
	34	{
	35	void (*pnx4008_cpu_standby_ptr) (void);
	36
	37	local_irq_disable();
	38	local_fiq_disable();
	39
	40	clk_disable(pll4_clk);
	41
	42	/saving portion of SRAM to be used by suspend function. /
	43	memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_standby_sz);
	44
	45	/*make sure SRAM copy gets physically written into SDRAM.
	46	SDRAM will be placed into self-refresh during power down */
	47	flush_cache_all();
	48
	49	/copy suspend function into SRAM /
	50	memcpy((void *)SRAM_VA, pnx4008_cpu_standby, pnx4008_cpu_standby_sz);
	51
	52	/do suspend /
	53	pnx4008_cpu_standby_ptr = (void *)SRAM_VA;
	54	pnx4008_cpu_standby_ptr();
	55
	56	/restoring portion of SRAM that was used by suspend function /
	57	memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_standby_sz);
	58
	59	clk_enable(pll4_clk);
	60
	61	local_fiq_enable();
	62	local_irq_enable();
	63	}
	64
	65	static inline void pnx4008_suspend(void)
	66	{
	67	void (*pnx4008_cpu_suspend_ptr) (void);
	68
	69	local_irq_disable();
	70	local_fiq_disable();
	71
	72	clk_disable(pll4_clk);
	73
	74	__raw_writel(0xffffffff, START_INT_RSR_REG(SE_PIN_BASE_INT));
	75	__raw_writel(0xffffffff, START_INT_RSR_REG(SE_INT_BASE_INT));
	76
	77	/saving portion of SRAM to be used by suspend function. /
	78	memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_suspend_sz);
	79
	80	/*make sure SRAM copy gets physically written into SDRAM.
	81	SDRAM will be placed into self-refresh during power down */
	82	flush_cache_all();
	83
	84	/copy suspend function into SRAM /
	85	memcpy((void *)SRAM_VA, pnx4008_cpu_suspend, pnx4008_cpu_suspend_sz);
	86
	87	/do suspend /
	88	pnx4008_cpu_suspend_ptr = (void *)SRAM_VA;
	89	pnx4008_cpu_suspend_ptr();
90
91	/restoring portion of SRAM that was used by suspend function /
92	memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_suspend_sz);
93
94	clk_enable(pll4_clk);
95
96	local_fiq_enable();
97	local_irq_enable();
98	}
99
100	static int pnx4008_pm_enter(suspend_state_t state)
101	{
102	switch (state) {
103	case PM_SUSPEND_STANDBY:
104	pnx4008_standby();
105	break;
106	case PM_SUSPEND_MEM:
107	pnx4008_suspend();
108	break;
78818e47 VW	109	}
	110	return 0;
	111	}
	112
e8c9c502	113	static int pnx4008_pm_valid(suspend_state_t state)
78818e47	114	{
e8c9c502 JB	115	return (state == PM_SUSPEND_STANDBY) \|\|
e8c9c502 JB	116	(state == PM_SUSPEND_MEM);
78818e47 VW	117	}
78818e47 VW	118
26398a70	119	static struct platform_suspend_ops pnx4008_pm_ops = {
78818e47	120	.enter = pnx4008_pm_enter,
e8c9c502	121	.valid = pnx4008_pm_valid,
78818e47 VW	122	};
	123
	124	static int __init pnx4008_pm_init(void)
	125	{
	126	u32 sram_size_to_allocate;
	127
	128	pll4_clk = clk_get(0, "ck_pll4");
	129	if (IS_ERR(pll4_clk)) {
	130	printk(KERN_ERR
	131	"PM Suspend cannot acquire ARM(PLL4) clock control\n");
	132	return PTR_ERR(pll4_clk);
	133	}
	134
	135	if (pnx4008_cpu_standby_sz > pnx4008_cpu_suspend_sz)
	136	sram_size_to_allocate = pnx4008_cpu_standby_sz;
	137	else
	138	sram_size_to_allocate = pnx4008_cpu_suspend_sz;
	139
	140	saved_sram = kmalloc(sram_size_to_allocate, GFP_ATOMIC);
	141	if (!saved_sram) {
	142	printk(KERN_ERR
	143	"PM Suspend: cannot allocate memory to save portion of SRAM\n");
	144	clk_put(pll4_clk);
	145	return -ENOMEM;
	146	}
	147
26398a70	148	suspend_set_ops(&pnx4008_pm_ops);
78818e47 VW	149	return 0;
	150	}
	151
	152	late_initcall(pnx4008_pm_init);