ARM: 6185/1: AT91: PM: dual ram controller support

This rework allows to address tow memory controllers. AT91SAM9263 and
AT91SAM9G45 family have tow SDRAM or DDR/SDRAM controllers. Power management
should take care of this.
This patch modify the way RAM IP header files are implemented to allow
access to registers of both controllers ; it also adds some macros.

We also modify the power management files to use those modified header files.
Slow clock (assembly) and regular power management functions are synchronized
for setting of RAM self-refresh procedure:
(lpr & ~AT91_DDRSDRC_LPCB) | AT91_DDRSDRC_LPCB_SELF_REFRESH

Note that AT91RM9200 is not impacted by this modification.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 54 insertions, 20 deletions

diff --git a/arch/arm/mach-at91/pm_slowclock.S b/arch/arm/mach-at91/pm_slowclock.S
index 9c5b48e68a71..b6b00a1f6125 100644
--- a/arch/arm/mach-at91/pm_slowclock.S
+++ b/arch/arm/mach-at91/pm_slowclock.S
@@ -16,10 +16,12 @@
 #include <mach/hardware.h>
 #include <mach/at91_pmc.h>
 
-#ifdef CONFIG_ARCH_AT91RM9200
+#if defined(CONFIG_ARCH_AT91RM9200)
 #include <mach/at91rm9200_mc.h>
 #elif defined(CONFIG_ARCH_AT91CAP9)
 #include <mach/at91cap9_ddrsdr.h>
+#elif defined(CONFIG_ARCH_AT91SAM9G45)
+#include <mach/at91sam9_ddrsdr.h>
 #else
 #include <mach/at91sam9_sdramc.h>
 #endif
@@ -30,7 +32,6 @@
  * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use;
  * handle those cases both here and in the Suspend-To-RAM support.
  */
-#define AT91_SDRAMC     AT91_SDRAMC0
 #warning Assuming EB1 SDRAM controller is *NOT* used
 #endif
 
@@ -113,12 +114,14 @@ ENTRY(at91_slow_clock)
         /*
          * Register usage:
          *  R1 = Base address of AT91_PMC
-         *  R2 = Base address of AT91_SDRAMC (or AT91_SYS on AT91RM9200)
+         *  R2 = Base address of RAM Controller (SDRAM, DDRSDR, or AT91_SYS)
          *  R3 = temporary register
          *  R4 = temporary register
+         *  R5 = Base address of second RAM Controller or 0 if not present
          */
         ldr     r1, .at91_va_base_pmc
         ldr     r2, .at91_va_base_sdramc
+        ldr     r5, .at91_va_base_ramc1
 
         /* Drain write buffer */
         mcr     p15, 0, r0, c7, c10, 4
@@ -127,20 +130,33 @@ ENTRY(at91_slow_clock)
         /* Put SDRAM in self-refresh mode */
         mov     r3, #1
         str     r3, [r2, #AT91_SDRAMC_SRR]
-#elif defined(CONFIG_ARCH_AT91CAP9)
-        /* Enable SDRAM self-refresh mode */
-        ldr     r3, [r2, #AT91_DDRSDRC_LPR - AT91_DDRSDRC]
-        str     r3, .saved_sam9_lpr
+#elif defined(CONFIG_ARCH_AT91CAP9) \
+        || defined(CONFIG_ARCH_AT91SAM9G45)
 
-        mov     r3, #AT91_DDRSDRC_LPCB_SELF_REFRESH
-        str     r3, [r2, #AT91_DDRSDRC_LPR - AT91_DDRSDRC]
+        /* prepare for DDRAM self-refresh mode */
+        ldr     r3, [r2, #AT91_DDRSDRC_LPR]
+        str     r3, .saved_sam9_lpr
+        bic     r3, #AT91_DDRSDRC_LPCB
+        orr     r3, #AT91_DDRSDRC_LPCB_SELF_REFRESH
+
+        /* figure out if we use the second ram controller */
+        cmp     r5, #0
+        ldrne   r4, [r5, #AT91_DDRSDRC_LPR]
+        strne   r4, .saved_sam9_lpr1
+        bicne   r4, #AT91_DDRSDRC_LPCB
+        orrne   r4, #AT91_DDRSDRC_LPCB_SELF_REFRESH
+
+        /* Enable DDRAM self-refresh mode */
+        str     r3, [r2, #AT91_DDRSDRC_LPR]
+        strne   r4, [r5, #AT91_DDRSDRC_LPR]
 #else
         /* Enable SDRAM self-refresh mode */
-        ldr     r3, [r2, #AT91_SDRAMC_LPR - AT91_SDRAMC]
+        ldr     r3, [r2, #AT91_SDRAMC_LPR]
         str     r3, .saved_sam9_lpr
 
-        mov     r3, #AT91_SDRAMC_LPCB_SELF_REFRESH
-        str     r3, [r2, #AT91_SDRAMC_LPR - AT91_SDRAMC]
+        bic     r3, #AT91_SDRAMC_LPCB
+        orr     r3, #AT91_SDRAMC_LPCB_SELF_REFRESH
+        str     r3, [r2, #AT91_SDRAMC_LPR]
 #endif
 
         /* Save Master clock setting */
@@ -247,14 +263,21 @@ ENTRY(at91_slow_clock)
 
 #ifdef CONFIG_ARCH_AT91RM9200
         /* Do nothing - self-refresh is automatically disabled. */
-#elif defined(CONFIG_ARCH_AT91CAP9)
-        /* Restore LPR on AT91CAP9 */
+#elif defined(CONFIG_ARCH_AT91CAP9) \
+        || defined(CONFIG_ARCH_AT91SAM9G45)
+        /* Restore LPR on AT91 with DDRAM */
         ldr     r3, .saved_sam9_lpr
-        str     r3, [r2, #AT91_DDRSDRC_LPR - AT91_DDRSDRC]
+        str     r3, [r2, #AT91_DDRSDRC_LPR]
+
+        /* if we use the second ram controller */
+        cmp     r5, #0
+        ldrne   r4, .saved_sam9_lpr1
+        strne   r4, [r5, #AT91_DDRSDRC_LPR]
+
 #else
-        /* Restore LPR on AT91SAM9 */
+        /* Restore LPR on AT91 with SDRAM */
         ldr     r3, .saved_sam9_lpr
-        str     r3, [r2, #AT91_SDRAMC_LPR - AT91_SDRAMC]
+        str     r3, [r2, #AT91_SDRAMC_LPR]
 #endif
 
         /* Restore registers, and return */
@@ -273,18 +296,29 @@ ENTRY(at91_slow_clock)
 .saved_sam9_lpr:
         .word 0
 
+.saved_sam9_lpr1:
+        .word 0
+
 .at91_va_base_pmc:
         .word AT91_VA_BASE_SYS + AT91_PMC
 
 #ifdef CONFIG_ARCH_AT91RM9200
 .at91_va_base_sdramc:
         .word AT91_VA_BASE_SYS
-#elif defined(CONFIG_ARCH_AT91CAP9)
+#elif defined(CONFIG_ARCH_AT91CAP9) \
+        || defined(CONFIG_ARCH_AT91SAM9G45)
 .at91_va_base_sdramc:
-        .word AT91_VA_BASE_SYS + AT91_DDRSDRC
+        .word AT91_VA_BASE_SYS + AT91_DDRSDRC0
 #else
 .at91_va_base_sdramc:
-        .word AT91_VA_BASE_SYS + AT91_SDRAMC
+        .word AT91_VA_BASE_SYS + AT91_SDRAMC0
+#endif
+
+.at91_va_base_ramc1:
+#if defined(CONFIG_ARCH_AT91SAM9G45)
+        .word AT91_VA_BASE_SYS + AT91_DDRSDRC1
+#else
+        .word 0
 #endif
 
 ENTRY(at91_slow_clock_sz)