ARM: OMAP: sram: Add am33xx SRAM support (minimal)

Update SRAM start & size for am33xx SoC's.

Note: cpu_is_34xx() is true for am33xx also. Doing
cpu_is_am33xx() check after cpu_is_34xx() will not
achieve what we want due to the above reason.
Hence cpu_is_am33xx() is done before cpu_is_34xx()
Signed-off-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Signed-off-by: Afzal Mohammed <afzal@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/sram.h

@@ -101,4 +101,5 @@ static inline void omap_push_sram_idle(void) {}
 #else
 #define OMAP4_SRAM_PA		0x40300000
 #endif
+#define AM33XX_SRAM_PA		0x40300000
 #endif

arch/arm/plat-omap/sram.c

@@ -86,7 +86,7 @@ static int is_sram_locked(void)
 			__raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
 			__raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
 		}
-		if (cpu_is_omap34xx()) {
+		if (cpu_is_omap34xx() && !cpu_is_am33xx()) {
 			__raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
 			__raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
 			__raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
@@ -124,7 +124,10 @@ static void __init omap_detect_sram(void)
 				omap_sram_size = 0x800; /* 2K */
 			}
 		} else {
-			if (cpu_is_omap34xx()) {
+			if (cpu_is_am33xx()) {
+				omap_sram_start = AM33XX_SRAM_PA;
+				omap_sram_size = 0x10000; /* 64K */
+			} else if (cpu_is_omap34xx()) {
 				omap_sram_start = OMAP3_SRAM_PA;
 				omap_sram_size = 0x10000; /* 64K */
 			} else if (cpu_is_omap44xx()) {
@@ -368,6 +371,11 @@ static inline int omap34xx_sram_init(void)
 	return 0;
 }
 
+static inline int am33xx_sram_init(void)
+{
+	return 0;
+}
+
 int __init omap_sram_init(void)
 {
 	omap_detect_sram();
@@ -379,6 +387,8 @@ int __init omap_sram_init(void)
 		omap242x_sram_init();
 	else if (cpu_is_omap2430())
 		omap243x_sram_init();
+	else if (cpu_is_am33xx())
+		am33xx_sram_init();
 	else if (cpu_is_omap34xx())
 		omap34xx_sram_init();