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-rw-r--r--arch/arm/mach-at91/pm_suspend.S142
1 files changed, 122 insertions, 20 deletions
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index daca91feea6a..a7c6ae13c945 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -42,6 +42,15 @@ tmp2 .req r5
.endm
/*
+ * Wait for main oscillator selection is done
+ */
+ .macro wait_moscsels
+1: ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_MOSCSELS
+ beq 1b
+ .endm
+
+/*
* Wait until PLLA has locked.
*/
.macro wait_pllalock
@@ -112,19 +121,20 @@ ENTRY(at91_pm_suspend_in_sram)
bl at91_sramc_self_refresh
ldr r0, .pm_mode
- cmp r0, #AT91_PM_SLOW_CLOCK
- beq slow_clock
+ cmp r0, #AT91_PM_STANDBY
+ beq standby
cmp r0, #AT91_PM_BACKUP
beq backup_mode
+ bl at91_ulp_mode
+ b exit_suspend
+
+standby:
/* Wait for interrupt */
ldr pmc, .pmc_base
at91_cpu_idle
b exit_suspend
-slow_clock:
- bl at91_slowck_mode
- b exit_suspend
backup_mode:
bl at91_backup_mode
b exit_suspend
@@ -151,7 +161,102 @@ ENTRY(at91_backup_mode)
str tmp1, [r0, #0]
ENDPROC(at91_backup_mode)
-ENTRY(at91_slowck_mode)
+.macro at91_pm_ulp0_mode
+ ldr pmc, .pmc_base
+
+ /* Turn off the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCEN
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ /* Wait for interrupt */
+ at91_cpu_idle
+
+ /* Turn on the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCEN
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscrdy
+.endm
+
+/**
+ * Note: This procedure only applies on the platform which uses
+ * the external crystal oscillator as a main clock source.
+ */
+.macro at91_pm_ulp1_mode
+ ldr pmc, .pmc_base
+
+ /* Switch the main clock source to 12-MHz RC oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCSEL
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscsels
+
+ /* Disable the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCEN
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ /* Switch the master clock source to main clock */
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ orr tmp1, tmp1, #AT91_PMC_CSS_MAIN
+ str tmp1, [pmc, #AT91_PMC_MCKR]
+
+ wait_mckrdy
+
+ /* Enter the ULP1 mode by set WAITMODE bit in CKGR_MOR */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_WAITMODE
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_mckrdy
+
+ /* Enable the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCEN
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscrdy
+
+ /* Switch the master clock source to slow clock */
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ str tmp1, [pmc, #AT91_PMC_MCKR]
+
+ wait_mckrdy
+
+ /* Switch main clock source to crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCSEL
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscsels
+
+ /* Switch the master clock source to main clock */
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ orr tmp1, tmp1, #AT91_PMC_CSS_MAIN
+ str tmp1, [pmc, #AT91_PMC_MCKR]
+
+ wait_mckrdy
+.endm
+
+ENTRY(at91_ulp_mode)
ldr pmc, .pmc_base
/* Save Master clock setting */
@@ -174,22 +279,19 @@ ENTRY(at91_slowck_mode)
orr tmp1, tmp1, #(1 << 29) /* bit 29 always set */
str tmp1, [pmc, #AT91_CKGR_PLLAR]
- /* Turn off the main oscillator */
- ldr tmp1, [pmc, #AT91_CKGR_MOR]
- bic tmp1, tmp1, #AT91_PMC_MOSCEN
- orr tmp1, tmp1, #AT91_PMC_KEY
- str tmp1, [pmc, #AT91_CKGR_MOR]
+ ldr r0, .pm_mode
+ cmp r0, #AT91_PM_ULP1
+ beq ulp1_mode
- /* Wait for interrupt */
- at91_cpu_idle
+ at91_pm_ulp0_mode
+ b ulp_exit
- /* Turn on the main oscillator */
- ldr tmp1, [pmc, #AT91_CKGR_MOR]
- orr tmp1, tmp1, #AT91_PMC_MOSCEN
- orr tmp1, tmp1, #AT91_PMC_KEY
- str tmp1, [pmc, #AT91_CKGR_MOR]
+ulp1_mode:
+ at91_pm_ulp1_mode
+ b ulp_exit
- wait_moscrdy
+ulp_exit:
+ ldr pmc, .pmc_base
/* Restore PLLA setting */
ldr tmp1, .saved_pllar
@@ -212,7 +314,7 @@ ENTRY(at91_slowck_mode)
wait_mckrdy
mov pc, lr
-ENDPROC(at91_slowck_mode)
+ENDPROC(at91_ulp_mode)
/*
* void at91_sramc_self_refresh(unsigned int is_active)