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Subject[PATCH v2 10/19] ARM: at91/pm_slowclock: add runtime detection of memory contoller
Date
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

This will allow to have all SoC in one kernel image.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
arch/arm/mach-at91/include/mach/at91_ramc.h | 9 ++--
arch/arm/mach-at91/pm.c | 15 +++++-
arch/arm/mach-at91/pm_slowclock.S | 66 +++++++++++++++++++++------
3 files changed, 68 insertions(+), 22 deletions(-)
diff --git a/arch/arm/mach-at91/include/mach/at91_ramc.h b/arch/arm/mach-at91/include/mach/at91_ramc.h
index 3155499..d8aeb27 100644
--- a/arch/arm/mach-at91/include/mach/at91_ramc.h
+++ b/arch/arm/mach-at91/include/mach/at91_ramc.h
@@ -21,11 +21,12 @@ extern void __iomem *at91_ramc_base[];
.extern at91_ramc_base
#endif

-#ifdef CONFIG_ARCH_AT91RM9200
-#include <mach/at91rm9200_mc.h>
-#else
+#define AT91_MEMCTRL_MC 0
+#define AT91_MEMCTRL_SDRAMC 1
+#define AT91_MEMCTRL_DDRSDR 2
+
+#include <mach/at91rm9200_sdramc.h>
#include <mach/at91sam9_ddrsdr.h>
#include <mach/at91sam9_sdramc.h>
-#endif

#endif /* __AT91_RAMC_H__ */
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 6a02ea2..83a0051 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -188,10 +188,12 @@ int at91_suspend_entering_slow_clock(void)
EXPORT_SYMBOL(at91_suspend_entering_slow_clock);


-static void (*slow_clock)(void __iomem *pmc, void __iomem *ramc0, void __iomem *ramc1);
+static void (*slow_clock)(void __iomem *pmc, void __iomem *ramc0,
+ void __iomem *ramc1, int memctrl);

#ifdef CONFIG_AT91_SLOW_CLOCK
-extern void at91_slow_clock(void __iomem *pmc, void __iomem *ramc0, void __iomem *ramc1);
+extern void at91_slow_clock(void __iomem *pmc, void __iomem *ramc0,
+ void __iomem *ramc1, int memctrl);
extern u32 at91_slow_clock_sz;
#endif

@@ -241,11 +243,18 @@ static int at91_pm_enter(suspend_state_t state)
* turning off the main oscillator; reverse on wakeup.
*/
if (slow_clock) {
+ int memctrl = AT91_MEMCTRL_SDRAMC;
+
+ if (cpu_is_at91rm9200())
+ memctrl = AT91_MEMCTRL_MC;
+ else if (cpu_is_at91sam9g45())
+ memctrl = AT91_MEMCTRL_DDRSDR;
#ifdef CONFIG_AT91_SLOW_CLOCK
/* copy slow_clock handler to SRAM, and call it */
memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
#endif
- slow_clock(at91_pmc_base, at91_ramc_base[0], at91_ramc_base[1]);
+ slow_clock(at91_pmc_base, at91_ramc_base[0],
+ at91_ramc_base[1], memctrl);
break;
} else {
pr_info("AT91: PM - no slow clock mode enabled ...\n");
diff --git a/arch/arm/mach-at91/pm_slowclock.S b/arch/arm/mach-at91/pm_slowclock.S
index 9c3117c..17f4d72 100644
--- a/arch/arm/mach-at91/pm_slowclock.S
+++ b/arch/arm/mach-at91/pm_slowclock.S
@@ -42,8 +42,9 @@
#define pmc r0
#define sdramc r1
#define ramc1 r2
-#define tmp1 r3
-#define tmp2 r4
+#define memctrl r3
+#define tmp1 r4
+#define tmp2 r5

/*
* Wait until master clock is ready (after switching master clock source)
@@ -103,29 +104,44 @@

.text

-/* void at91_slow_clock(void __iomem *pmc, void __iomem *sdramc, void __iomem *ramc1) */
+/* void at91_slow_clock(void __iomem *pmc, void __iomem *sdramc,
+ * void __iomem *ramc1, int memctrl)
+ */
ENTRY(at91_slow_clock)
/* Save registers on stack */
- stmfd sp!, {r3 - r12, lr}
+ stmfd sp!, {r4 - r12, lr}

/*
* Register usage:
* R0 = Base address of AT91_PMC
* R1 = Base address of RAM Controller (SDRAM, DDRSDR, or AT91_SYS)
* R2 = Base address of second RAM Controller or 0 if not present
- * R3 = temporary register
+ * R3 = Memory controller
* R4 = temporary register
+ * R5 = temporary register
*/

/* Drain write buffer */
mov tmp1, #0
mcr p15, 0, tmp1, c7, c10, 4

-#ifdef CONFIG_ARCH_AT91RM9200
+ cmp memctrl, #AT91_MEMCTRL_MC
+ bne ddr_sr_enable
+
+ /*
+ * at91rm9200 Memory controller
+ */
/* Put SDRAM in self-refresh mode */
mov tmp1, #1
str tmp1, [sdramc, #AT91RM9200_SDRAMC_SRR]
-#elif defined(CONFIG_ARCH_AT91SAM9G45)
+ b sdr_sr_done
+
+ /*
+ * DDRSDR Memory controller
+ */
+ddr_sr_enable:
+ cmp memctrl, #AT91_MEMCTRL_DDRSDR
+ bne sdr_sr_enable

/* prepare for DDRAM self-refresh mode */
ldr tmp1, [sdramc, #AT91_DDRSDRC_LPR]
@@ -143,7 +159,13 @@ ENTRY(at91_slow_clock)
/* Enable DDRAM self-refresh mode */
str tmp1, [sdramc, #AT91_DDRSDRC_LPR]
strne tmp2, [ramc1, #AT91_DDRSDRC_LPR]
-#else
+
+ b sdr_sr_done
+
+ /*
+ * SDRAMC Memory controller
+ */
+sdr_sr_enable:
/* Enable SDRAM self-refresh mode */
ldr tmp1, [sdramc, #AT91_SDRAMC_LPR]
str tmp1, .saved_sam9_lpr
@@ -151,8 +173,8 @@ ENTRY(at91_slow_clock)
bic tmp1, #AT91_SDRAMC_LPCB
orr tmp1, #AT91_SDRAMC_LPCB_SELF_REFRESH
str tmp1, [sdramc, #AT91_SDRAMC_LPR]
-#endif

+sdr_sr_done:
/* Save Master clock setting */
ldr tmp1, [pmc, #(AT91_PMC_MCKR - AT91_PMC)]
str tmp1, .saved_mckr
@@ -255,9 +277,18 @@ ENTRY(at91_slow_clock)

wait_mckrdy

-#ifdef CONFIG_ARCH_AT91RM9200
- /* Do nothing - self-refresh is automatically disabled. */
-#elif defined(CONFIG_ARCH_AT91SAM9G45)
+ /*
+ * at91rm9200 Memory controller
+ * Do nothing - self-refresh is automatically disabled.
+ */
+ cmp memctrl, #AT91_MEMCTRL_MC
+ beq ram_restored
+
+ /*
+ * DDRSDR Memory controller
+ */
+ cmp memctrl, #AT91_MEMCTRL_DDRSDR
+ bne sdr_en_restore
/* Restore LPR on AT91 with DDRAM */
ldr tmp1, .saved_sam9_lpr
str tmp1, [sdramc, #AT91_DDRSDRC_LPR]
@@ -267,14 +298,19 @@ ENTRY(at91_slow_clock)
ldrne tmp2, .saved_sam9_lpr1
strne tmp2, [ramc1, #AT91_DDRSDRC_LPR]

-#else
+ b ram_restored
+
+ /*
+ * SDRAMC Memory controller
+ */
+sdr_en_restore:
/* Restore LPR on AT91 with SDRAM */
ldr tmp1, .saved_sam9_lpr
str tmp1, [sdramc, #AT91_SDRAMC_LPR]
-#endif

+ram_restored:
/* Restore registers, and return */
- ldmfd sp!, {r3 - r12, pc}
+ ldmfd sp!, {r4 - r12, pc}


.saved_mckr:
--
1.7.9


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