[PATCH v5 1/5] ARM: at91: pm: create a separate procedure for the ULP0 mode

Wenyou Yang
2016-03-16T07:04:12Z

To make the code more legible and prepare to add the ULP1 mode
support in the future, create a separate procedure for the ULP0 mode.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

arch/arm/mach-at91/pm_suspend.S | 65 ++++++++++++++++++++++++---------------
1 file changed, 40 insertions(+), 25 deletions(-)

diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index a25defd..5fcffdc 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -107,7 +107,7 @@ ENTRY(at91_pm_suspend_in_sram)

ldr r0, .pm_mode
tst r0, #AT91_PM_SLOW_CLOCK
- beq skip_disable_main_clock
+ beq standby_mode

ldr pmc, .pmc_base

@@ -131,32 +131,13 @@ ENTRY(at91_pm_suspend_in_sram)
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]
-
-skip_disable_main_clock:
- ldr pmc, .pmc_base
-
- /* Wait for interrupt */
- at91_cpu_idle
-
- ldr r0, .pm_mode
- tst r0, #AT91_PM_SLOW_CLOCK
- beq skip_enable_main_clock
+ulp0_mode:
+ bl at91_pm_ulp0_mode
+ b ulp_exit

+ulp_exit:
ldr pmc, .pmc_base

- /* 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]
-
- wait_moscrdy
-
/* Restore PLLA setting */
ldr tmp1, .saved_pllar
str tmp1, [pmc, #AT91_CKGR_PLLAR]
@@ -177,7 +158,15 @@ skip_disable_main_clock:

wait_mckrdy

-skip_enable_main_clock:
+ b pm_exit
+
+standby_mode:
+ ldr pmc, .pmc_base
+
+ /* Wait for interrupt */
+ at91_cpu_idle
+
+pm_exit:
/* Exit the self-refresh mode */
mov r0, #SRAMC_SELF_FRESH_EXIT
bl at91_sramc_self_refresh
@@ -311,6 +300,32 @@ exit_sramc_sf:
mov pc, lr
ENDPROC(at91_sramc_self_refresh)

+/*
+ * void at91_pm_ulp0_mode(void)
+ */
+ENTRY(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
+
+ mov pc, lr
+ENDPROC(at91_pm_ulp0_mode)
+
.pmc_base:
.word 0
.sramc_base:
--
1.7.9.5