arm: omap4: Fix SDRAM AUTO DETECTION

Commit "8602114 omap: emif: configure emif only when required"
breaks SDRAM_AUTO_DETECTION.
The issue is dmm_init() depends on emif_sizes[](SDRAM Auto detection)
done in do_sdram_init(). The above commit moves dmm_init() above
do_sdram_init() because of which dmm_init() uses uninitialized
emif_sizes[].
So instead of using global emif_sizes[], get sdram details locally
and calculate emif sizes.

Reported-by: Michael Cashwell <mboards@prograde.net>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

arch/arm/cpu/armv7/omap-common/emif-common.c

@@ -655,20 +655,27 @@ static u32 get_ddr_phy_ctrl_1(u32 freq, u8 RL)
 	return phy;
 }
 
-static u32 get_emif_mem_size(struct emif_device_details *devices)
+static u32 get_emif_mem_size(u32 base)
 {
 	u32 size_mbytes = 0, temp;
+	struct emif_device_details dev_details;
+	struct lpddr2_device_details cs0_dev_details, cs1_dev_details;
+	u32 emif_nr = emif_num(base);
 
-	if (!devices)
-		return 0;
+	emif_reset_phy(base);
+	dev_details.cs0_device_details = emif_get_device_details(emif_nr, CS0,
+						&cs0_dev_details);
+	dev_details.cs1_device_details = emif_get_device_details(emif_nr, CS1,
+						&cs1_dev_details);
+	emif_reset_phy(base);
 
-	if (devices->cs0_device_details) {
-		temp = devices->cs0_device_details->density;
+	if (dev_details.cs0_device_details) {
+		temp = dev_details.cs0_device_details->density;
 		size_mbytes += lpddr2_density_2_size_in_mbytes[temp];
 	}
 
-	if (devices->cs1_device_details) {
-		temp = devices->cs1_device_details->density;
+	if (dev_details.cs1_device_details) {
+		temp = dev_details.cs1_device_details->density;
 		size_mbytes += lpddr2_density_2_size_in_mbytes[temp];
 	}
 	/* convert to bytes */
@@ -1040,13 +1047,9 @@ static void do_sdram_init(u32 base)
 	/* Return if no devices on this EMIF */
 	if (!dev_details.cs0_device_details &&
 	    !dev_details.cs1_device_details) {
-		emif_sizes[emif_nr - 1] = 0;
 		return;
 	}
 
-	if (!in_sdram)
-		emif_sizes[emif_nr - 1] = get_emif_mem_size(&dev_details);
-
 	/*
 	 * Get device timings:
 	 * - Default timings specified by JESD209-2 if
@@ -1108,8 +1111,8 @@ void dmm_init(u32 base)
 	mapped_size = 0;
 	section_cnt = 3;
 	sys_addr = CONFIG_SYS_SDRAM_BASE;
-	emif1_size = emif_sizes[0];
-	emif2_size = emif_sizes[1];
+	emif1_size = get_emif_mem_size(EMIF1_BASE);
+	emif2_size = get_emif_mem_size(EMIF2_BASE);
 	debug("emif1_size 0x%x emif2_size 0x%x\n", emif1_size, emif2_size);
 
 	if (!emif1_size && !emif2_size)

arch/arm/cpu/armv7/omap4/emif.c

@@ -33,7 +33,6 @@
 #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
 u32 *const T_num = (u32 *)OMAP4_SRAM_SCRATCH_EMIF_T_NUM;
 u32 *const T_den = (u32 *)OMAP4_SRAM_SCRATCH_EMIF_T_DEN;
-u32 *const emif_sizes = (u32 *)OMAP4_SRAM_SCRATCH_EMIF_SIZE;
 #endif
 
 #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS

arch/arm/cpu/armv7/omap5/emif.c

@@ -34,7 +34,6 @@
 #define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
 static u32 *const T_num = (u32 *)OMAP5_SRAM_SCRATCH_EMIF_T_NUM;
 static u32 *const T_den = (u32 *)OMAP5_SRAM_SCRATCH_EMIF_T_DEN;
-static u32 *const emif_sizes = (u32 *)OMAP5_SRAM_SCRATCH_EMIF_SIZE;
 #endif
 
 #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS

arch/arm/include/asm/arch-omap4/omap.h

@@ -147,7 +147,6 @@ struct s32ktimer {
 #define SRAM_SCRATCH_SPACE_ADDR		NON_SECURE_SRAM_START
 /* SRAM scratch space entries */
 #define OMAP4_SRAM_SCRATCH_OMAP4_REV	SRAM_SCRATCH_SPACE_ADDR
-#define OMAP4_SRAM_SCRATCH_EMIF_SIZE	(SRAM_SCRATCH_SPACE_ADDR + 0x4)
 #define OMAP4_SRAM_SCRATCH_EMIF_T_NUM	(SRAM_SCRATCH_SPACE_ADDR + 0xC)
 #define OMAP4_SRAM_SCRATCH_EMIF_T_DEN	(SRAM_SCRATCH_SPACE_ADDR + 0x10)
 #define OMAP_SRAM_SCRATCH_PRCM_PTR      (SRAM_SCRATCH_SPACE_ADDR + 0x14)

arch/arm/include/asm/arch-omap5/omap.h

@@ -196,7 +196,6 @@ struct s32ktimer {
  * SRAM scratch space entries
  */
 #define OMAP5_SRAM_SCRATCH_OMAP5_REV	SRAM_SCRATCH_SPACE_ADDR
-#define OMAP5_SRAM_SCRATCH_EMIF_SIZE	(SRAM_SCRATCH_SPACE_ADDR + 0x4)
 #define OMAP5_SRAM_SCRATCH_EMIF_T_NUM	(SRAM_SCRATCH_SPACE_ADDR + 0xC)
 #define OMAP5_SRAM_SCRATCH_EMIF_T_DEN	(SRAM_SCRATCH_SPACE_ADDR + 0x10)
 #define OMAP_SRAM_SCRATCH_PRCM_PTR      (SRAM_SCRATCH_SPACE_ADDR + 0x14)

arch/arm/include/asm/emif.h

@@ -1165,7 +1165,6 @@ void get_lpddr2_mr_regs(const struct lpddr2_mr_regs **regs);
 #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
 extern u32 *const T_num;
 extern u32 *const T_den;
-extern u32 *const emif_sizes;
 #endif
 
 void config_data_eye_leveling_samples(u32 emif_base);