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Diffstat (limited to 'arch/arm/mach-omap2/pm34xx.c')
-rw-r--r--arch/arm/mach-omap2/pm34xx.c80
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 */