diff options
Diffstat (limited to 'arch/arm/mach-omap2/pm34xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/pm34xx.c | 80 |
1 files changed, 37 insertions, 43 deletions
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index c155c9d1c82c..b77d82665abb 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -31,6 +31,8 @@ #include <linux/console.h> #include <trace/events/power.h> +#include <asm/suspend.h> + #include <plat/sram.h> #include "clockdomain.h" #include "powerdomain.h" @@ -40,8 +42,6 @@ #include <plat/gpmc.h> #include <plat/dma.h> -#include <asm/tlbflush.h> - #include "cm2xxx_3xxx.h" #include "cm-regbits-34xx.h" #include "prm-regbits-34xx.h" @@ -64,11 +64,6 @@ static inline bool is_suspending(void) } #endif -/* Scratchpad offsets */ -#define OMAP343X_TABLE_ADDRESS_OFFSET 0xc4 -#define OMAP343X_TABLE_VALUE_OFFSET 0xc0 -#define OMAP343X_CONTROL_REG_VALUE_OFFSET 0xc8 - /* pm34xx errata defined in pm.h */ u16 pm34xx_errata; @@ -83,9 +78,8 @@ struct power_state { static LIST_HEAD(pwrst_list); -static void (*_omap_sram_idle)(u32 *addr, int save_state); - static int (*_omap_save_secure_sram)(u32 *addr); +void (*omap3_do_wfi_sram)(void); static struct powerdomain *mpu_pwrdm, *neon_pwrdm; static struct powerdomain *core_pwrdm, *per_pwrdm; @@ -312,28 +306,25 @@ static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id) return IRQ_HANDLED; } -/* Function to restore the table entry that was modified for enabling MMU */ -static void restore_table_entry(void) +static void omap34xx_save_context(u32 *save) { - void __iomem *scratchpad_address; - u32 previous_value, control_reg_value; - u32 *address; + u32 val; - scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD); + /* Read Auxiliary Control Register */ + asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val)); + *save++ = 1; + *save++ = val; - /* Get address of entry that was modified */ - address = (u32 *)__raw_readl(scratchpad_address + - OMAP343X_TABLE_ADDRESS_OFFSET); - /* Get the previous value which needs to be restored */ - previous_value = __raw_readl(scratchpad_address + - OMAP343X_TABLE_VALUE_OFFSET); - address = __va(address); - *address = previous_value; - flush_tlb_all(); - control_reg_value = __raw_readl(scratchpad_address - + OMAP343X_CONTROL_REG_VALUE_OFFSET); - /* This will enable caches and prediction */ - set_cr(control_reg_value); + /* Read L2 AUX ctrl register */ + asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val)); + *save++ = 1; + *save++ = val; +} + +static int omap34xx_do_sram_idle(unsigned long save_state) +{ + omap34xx_cpu_suspend(save_state); + return 0; } void omap_sram_idle(void) @@ -352,9 +343,6 @@ void omap_sram_idle(void) int core_prev_state, per_prev_state; u32 sdrc_pwr = 0; - if (!_omap_sram_idle) - return; - pwrdm_clear_all_prev_pwrst(mpu_pwrdm); pwrdm_clear_all_prev_pwrst(neon_pwrdm); pwrdm_clear_all_prev_pwrst(core_pwrdm); @@ -432,12 +420,16 @@ void omap_sram_idle(void) sdrc_pwr = sdrc_read_reg(SDRC_POWER); /* - * omap3_arm_context is the location where ARM registers - * get saved. The restore path then reads from this - * location and restores them back. + * omap3_arm_context is the location where some ARM context + * get saved. The rest is placed on the stack, and restored + * from there before resuming. */ - _omap_sram_idle(omap3_arm_context, save_state); - cpu_init(); + if (save_state) + omap34xx_save_context(omap3_arm_context); + if (save_state == 1 || save_state == 3) + cpu_suspend(save_state, omap34xx_do_sram_idle); + else + omap34xx_do_sram_idle(save_state); /* Restore normal SDRC POWER settings */ if (omap_rev() >= OMAP3430_REV_ES3_0 && @@ -445,10 +437,6 @@ void omap_sram_idle(void) core_next_state == PWRDM_POWER_OFF) sdrc_write_reg(sdrc_pwr, SDRC_POWER); - /* Restore table entry modified during MMU restoration */ - if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF) - restore_table_entry(); - /* CORE */ if (core_next_state < PWRDM_POWER_ON) { core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm); @@ -852,10 +840,17 @@ static int __init clkdms_setup(struct clockdomain *clkdm, void *unused) return 0; } +/* + * Push functions to SRAM + * + * The minimum set of functions is pushed to SRAM for execution: + * - omap3_do_wfi for erratum i581 WA, + * - save_secure_ram_context for security extensions. + */ void omap_push_sram_idle(void) { - _omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend, - omap34xx_cpu_suspend_sz); + omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz); + if (omap_type() != OMAP2_DEVICE_TYPE_GP) _omap_save_secure_sram = omap_sram_push(save_secure_ram_context, save_secure_ram_context_sz); @@ -920,7 +915,6 @@ static int __init omap3_pm_init(void) per_clkdm = clkdm_lookup("per_clkdm"); core_clkdm = clkdm_lookup("core_clkdm"); - omap_push_sram_idle(); #ifdef CONFIG_SUSPEND suspend_set_ops(&omap_pm_ops); #endif /* CONFIG_SUSPEND */ |