26398a70ea
The name of 'struct pm_ops' suggests that it is related to the power management in general, but in fact it is only related to suspend. Moreover, its name should indicate what this structure is used for, so it seems reasonable to change it to 'struct platform_suspend_ops'. In that case, the name of the global variable of this type used by the PM core and the names of related functions should be changed accordingly. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Len Brown <lenb@kernel.org> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
154 lines
3.6 KiB
C
154 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 <asm/io.h>
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#include <asm/mach-types.h>
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#include <asm/cacheflush.h>
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#include <asm/arch/pm.h>
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#include <asm/arch/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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