152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
/*
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* arch/arm/mach-pnx4008/pm.c
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*
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* Power Management driver for PNX4008
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*
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* Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
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*
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* 2005 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/pm.h>
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#include <linux/rtc.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include <linux/suspend.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <asm/cacheflush.h>
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#include <mach/pm.h>
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#include <mach/clock.h>
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#define SRAM_VA IO_ADDRESS(PNX4008_IRAM_BASE)
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static void *saved_sram;
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static struct clk *pll4_clk;
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static inline void pnx4008_standby(void)
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{
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void (*pnx4008_cpu_standby_ptr) (void);
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local_irq_disable();
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local_fiq_disable();
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clk_disable(pll4_clk);
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/*saving portion of SRAM to be used by suspend function. */
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memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_standby_sz);
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/*make sure SRAM copy gets physically written into SDRAM.
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SDRAM will be placed into self-refresh during power down */
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flush_cache_all();
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/*copy suspend function into SRAM */
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memcpy((void *)SRAM_VA, pnx4008_cpu_standby, pnx4008_cpu_standby_sz);
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/*do suspend */
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pnx4008_cpu_standby_ptr = (void *)SRAM_VA;
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pnx4008_cpu_standby_ptr();
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/*restoring portion of SRAM that was used by suspend function */
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memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_standby_sz);
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clk_enable(pll4_clk);
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local_fiq_enable();
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local_irq_enable();
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}
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static inline void pnx4008_suspend(void)
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{
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void (*pnx4008_cpu_suspend_ptr) (void);
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local_irq_disable();
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local_fiq_disable();
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clk_disable(pll4_clk);
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__raw_writel(0xffffffff, START_INT_RSR_REG(SE_PIN_BASE_INT));
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__raw_writel(0xffffffff, START_INT_RSR_REG(SE_INT_BASE_INT));
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/*saving portion of SRAM to be used by suspend function. */
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memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_suspend_sz);
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/*make sure SRAM copy gets physically written into SDRAM.
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SDRAM will be placed into self-refresh during power down */
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flush_cache_all();
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/*copy suspend function into SRAM */
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memcpy((void *)SRAM_VA, pnx4008_cpu_suspend, pnx4008_cpu_suspend_sz);
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/*do suspend */
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pnx4008_cpu_suspend_ptr = (void *)SRAM_VA;
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pnx4008_cpu_suspend_ptr();
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/*restoring portion of SRAM that was used by suspend function */
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memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_suspend_sz);
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clk_enable(pll4_clk);
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local_fiq_enable();
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local_irq_enable();
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}
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static int pnx4008_pm_enter(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_STANDBY:
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pnx4008_standby();
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break;
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case PM_SUSPEND_MEM:
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pnx4008_suspend();
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break;
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}
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return 0;
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}
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static int pnx4008_pm_valid(suspend_state_t state)
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{
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return (state == PM_SUSPEND_STANDBY) ||
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(state == PM_SUSPEND_MEM);
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}
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static struct platform_suspend_ops pnx4008_pm_ops = {
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.enter = pnx4008_pm_enter,
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.valid = pnx4008_pm_valid,
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};
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static int __init pnx4008_pm_init(void)
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{
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u32 sram_size_to_allocate;
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pll4_clk = clk_get(0, "ck_pll4");
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if (IS_ERR(pll4_clk)) {
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printk(KERN_ERR
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"PM Suspend cannot acquire ARM(PLL4) clock control\n");
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return PTR_ERR(pll4_clk);
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}
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if (pnx4008_cpu_standby_sz > pnx4008_cpu_suspend_sz)
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sram_size_to_allocate = pnx4008_cpu_standby_sz;
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else
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sram_size_to_allocate = pnx4008_cpu_suspend_sz;
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saved_sram = kmalloc(sram_size_to_allocate, GFP_ATOMIC);
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if (!saved_sram) {
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printk(KERN_ERR
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"PM Suspend: cannot allocate memory to save portion of SRAM\n");
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clk_put(pll4_clk);
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return -ENOMEM;
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}
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suspend_set_ops(&pnx4008_pm_ops);
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return 0;
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}
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late_initcall(pnx4008_pm_init);
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