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Subject[PATCH v2.0 3/6] pm: at91: standby mode uses same sram function as suspend to memory mode
Date
To simply the PM code, the suspend to standby mode uses same sram function
as the suspend to memory mode, running in the internal SRAM, instead of the
respective code for each mode.

For the suspend to standby mode, the master clock doesn't switch to the slow
clock, and PLLA and the main oscillator doesn't turn off as well.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---
arch/arm/mach-at91/pm.c | 85 +++++++++++++++++--------------------
arch/arm/mach-at91/pm.h | 10 +++++
arch/arm/mach-at91/pm_slowclock.S | 25 ++++++++++-
3 files changed, 73 insertions(+), 47 deletions(-)

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 7cb3a33..3fc5e12 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -128,62 +128,55 @@ extern void at91_slow_clock(void __iomem *pmc, void __iomem *ramc0,
void __iomem *ramc1, int memctrl);
extern u32 at91_slow_clock_sz;

+static void at91_pm_suspend(suspend_state_t state)
+{
+ unsigned int pm_data = at91_pm_data.memctrl;
+
+ pm_data |= (state == PM_SUSPEND_MEM) ?
+ AT91_PM_MODE(AT91_PM_SLOW_CLOCK) : 0;
+
+ slow_clock(at91_pmc_base, at91_ramc_base[0],
+ at91_ramc_base[1], pm_data);
+}
+
static int at91_pm_enter(suspend_state_t state)
{
at91_pinctrl_gpio_suspend();

switch (state) {
+ /*
+ * Suspend-to-RAM is like STANDBY plus slow clock mode, so
+ * drivers must suspend more deeply, the master clock switches
+ * to the clk32k and turns off the main oscillator
+ */
+ case PM_SUSPEND_MEM:
/*
- * Suspend-to-RAM is like STANDBY plus slow clock mode, so
- * drivers must suspend more deeply: only the master clock
- * controller may be using the main oscillator.
+ * Ensure that clocks are in a valid state.
*/
- case PM_SUSPEND_MEM:
- /*
- * Ensure that clocks are in a valid state.
- */
- if (!at91_pm_verify_clocks())
- goto error;
-
- /*
- * Enter slow clock mode by switching over to clk32k and
- * turning off the main oscillator; reverse on wakeup.
- */
- if (slow_clock) {
- slow_clock(at91_pmc_base, at91_ramc_base[0],
- at91_ramc_base[1],
- at91_pm_data.memctrl);
- break;
- } else {
- pr_info("AT91: PM - no slow clock mode enabled ...\n");
- /* FALLTHROUGH leaving master clock alone */
- }
+ if (!at91_pm_verify_clocks())
+ goto error;

- /*
- * STANDBY mode has *all* drivers suspended; ignores irqs not
- * marked as 'wakeup' event sources; and reduces DRAM power.
- * But otherwise it's identical to PM_SUSPEND_ON: cpu idle, and
- * nothing fancy done with main or cpu clocks.
- */
- case PM_SUSPEND_STANDBY:
- /*
- * NOTE: the Wait-for-Interrupt instruction needs to be
- * in icache so no SDRAM accesses are needed until the
- * wakeup IRQ occurs and self-refresh is terminated.
- * For ARM 926 based chips, this requirement is weaker
- * as at91sam9 can access a RAM in self-refresh mode.
- */
- if (at91_pm_standby)
- at91_pm_standby();
- break;
+ at91_pm_suspend(state);

- case PM_SUSPEND_ON:
- cpu_do_idle();
- break;
+ break;

- default:
- pr_debug("AT91: PM - bogus suspend state %d\n", state);
- goto error;
+ /*
+ * STANDBY mode has *all* drivers suspended; ignores irqs not
+ * marked as 'wakeup' event sources; and reduces DRAM power.
+ * But otherwise it's identical to PM_SUSPEND_ON: cpu idle, and
+ * nothing fancy done with main or cpu clocks.
+ */
+ case PM_SUSPEND_STANDBY:
+ at91_pm_suspend(state);
+ break;
+
+ case PM_SUSPEND_ON:
+ cpu_do_idle();
+ break;
+
+ default:
+ pr_debug("AT91: PM - bogus suspend state %d\n", state);
+ goto error;
}

error:
diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
index 86a9d0b..dcacfa1 100644
--- a/arch/arm/mach-at91/pm.h
+++ b/arch/arm/mach-at91/pm.h
@@ -15,6 +15,14 @@

#include <mach/at91_ramc.h>

+#define AT91_PM_MEMTYPE_MASK 0x0f
+
+#define AT91_PM_MODE_OFFSET 4
+#define AT91_PM_MODE_MASK 0x01
+#define AT91_PM_MODE(x) (((x) & AT91_PM_MODE_MASK) << AT91_PM_MODE_OFFSET)
+
+#define AT91_PM_SLOW_CLOCK 0x01
+
/*
* The AT91RM9200 goes into self-refresh mode with this command, and will
* terminate self-refresh automatically on the next SDRAM access.
@@ -25,6 +33,7 @@
* still in self-refresh is "not recommended", but seems to work.
*/

+#ifndef __ASSEMBLY__
static inline void at91rm9200_standby(void)
{
u32 lpr = at91_ramc_read(0, AT91RM9200_SDRAMC_LPR);
@@ -106,3 +115,4 @@ static inline void at91sam9_sdram_standby(void)
}

#endif
+#endif
diff --git a/arch/arm/mach-at91/pm_slowclock.S b/arch/arm/mach-at91/pm_slowclock.S
index 517e344..b0939c8 100644
--- a/arch/arm/mach-at91/pm_slowclock.S
+++ b/arch/arm/mach-at91/pm_slowclock.S
@@ -15,6 +15,7 @@
#include <linux/clk/at91_pmc.h>
#include <mach/hardware.h>
#include <mach/at91_ramc.h>
+#include "pm.h"

#define SRAMC_SELF_FRESH_ACTIVE 0x01
#define SRAMC_SELF_FRESH_EXIT 0x00
@@ -85,12 +86,22 @@ ENTRY(at91_slow_clock)
str r0, .pmc_base
str r1, .sramc_base
str r2, .sramc1_base
- str r3, .memtype
+
+ and r0, r3, #AT91_PM_MEMTYPE_MASK
+ str r0, .memtype
+
+ lsr r0, r3, #AT91_PM_MODE_OFFSET
+ and r0, r0, #AT91_PM_MODE_MASK
+ str r0, .pm_mode

/* Active the self-refresh mode */
mov r0, #SRAMC_SELF_FRESH_ACTIVE
bl at91_sramc_self_refresh

+ ldr r0, .pm_mode
+ tst r0, #AT91_PM_SLOW_CLOCK
+ beq skip_disable_main_clock
+
ldr pmc, .pmc_base

/* Save Master clock setting */
@@ -126,9 +137,18 @@ ENTRY(at91_slow_clock)
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]

+skip_disable_main_clock:
+ ldr pmc, .pmc_base
+
/* Wait for interrupt */
mcr p15, 0, tmp1, c7, c0, 4

+ ldr r0, .pm_mode
+ tst r0, #AT91_PM_SLOW_CLOCK
+ beq skip_enable_main_clock
+
+ ldr pmc, .pmc_base
+
/* Turn on the main oscillator */
ldr tmp1, [pmc, #AT91_CKGR_MOR]
orr tmp1, tmp1, #AT91_PMC_MOSCEN
@@ -169,6 +189,7 @@ ENTRY(at91_slow_clock)

wait_mckrdy

+skip_enable_main_clock:
/* Exit the self-refresh mode */
mov r0, #SRAMC_SELF_FRESH_EXIT
bl at91_sramc_self_refresh
@@ -311,6 +332,8 @@ ENDPROC(at91_sramc_self_refresh)
.word 0
.memtype:
.word 0
+.pm_mode:
+ .word 0
.saved_mckr:
.word 0
.saved_pllar:
--
1.7.9.5


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