[U-Boot] [PATCHv4 3/3] OMAP3: Print correct silicon revision

[Sanjeev Premi]

The function display_board_info() displays incorrect
silicon revision - based on the return value from
function get_cpu_rev().

This patch fixes the problem.

Signed-off-by: Sanjeev Premi <premi at ti.com>
---
 cpu/arm_cortexa8/cpu.c             |    4 ++--
 cpu/arm_cortexa8/omap3/clock.c     |    5 +++--
 cpu/arm_cortexa8/omap3/sys_info.c  |   29 ++++++++++++++++++++++-------
 include/asm-arm/arch-omap3/omap3.h |   14 +++++++++-----
 4 files changed, 36 insertions(+), 16 deletions(-)

diff --git a/cpu/arm_cortexa8/cpu.c b/cpu/arm_cortexa8/cpu.c
index 5e7b935..3e1780b 100644
--- a/cpu/arm_cortexa8/cpu.c
+++ b/cpu/arm_cortexa8/cpu.c
@@ -101,7 +101,7 @@ void l2cache_enable()
 	volatile unsigned int j;
 
 	/* ES2 onwards we can disable/enable L2 ourselves */
-	if (get_cpu_rev() == CPU_3430_ES2) {
+	if (get_cpu_rev() >= CPU_3XX_ES20) {
 		__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
 		__asm__ __volatile__("orr %0, %0, #0x2":"=r"(i));
 		__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
@@ -131,7 +131,7 @@ void l2cache_disable()
 	volatile unsigned int j;
 
 	/* ES2 onwards we can disable/enable L2 ourselves */
-	if (get_cpu_rev() == CPU_3430_ES2) {
+	if (get_cpu_rev() >= CPU_3XX_ES20) {
 		__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
 		__asm__ __volatile__("bic %0, %0, #0x2":"=r"(i));
 		__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
diff --git a/cpu/arm_cortexa8/omap3/clock.c b/cpu/arm_cortexa8/omap3/clock.c
index 8ac31be..d035677 100644
--- a/cpu/arm_cortexa8/omap3/clock.c
+++ b/cpu/arm_cortexa8/omap3/clock.c
@@ -132,7 +132,7 @@ void prcm_init(void)
 	void (*f_lock_pll) (u32, u32, u32, u32);
 	int xip_safe, p0, p1, p2, p3;
 	u32 osc_clk = 0, sys_clkin_sel;
-	u32 clk_index, sil_index;
+	u32 clk_index, sil_index = 0;
 	prm_t *prm_base = (prm_t *)PRM_BASE;
 	prcm_t *prcm_base = (prcm_t *)PRCM_BASE;
 	dpll_param *dpll_param_p;
@@ -170,7 +170,8 @@ void prcm_init(void)
 	 * and sil_index will get the values for that SysClk for the
 	 * appropriate silicon rev.
 	 */
-	sil_index = get_cpu_rev() - 1;
+	if (get_cpu_rev())
+		sil_index = 1;
 
 	/* Unlock MPU DPLL (slows things down, and needed later) */
 	sr32(&prcm_base->clken_pll_mpu, 0, 3, PLL_LOW_POWER_BYPASS);
diff --git a/cpu/arm_cortexa8/omap3/sys_info.c b/cpu/arm_cortexa8/omap3/sys_info.c
index fb240df..2f04cd6 100644
--- a/cpu/arm_cortexa8/omap3/sys_info.c
+++ b/cpu/arm_cortexa8/omap3/sys_info.c
@@ -35,6 +35,12 @@ extern omap3_sysinfo sysinfo;
 static gpmc_csx_t *gpmc_cs_base = (gpmc_csx_t *)GPMC_CONFIG_CS0_BASE;
 static sdrc_t *sdrc_base = (sdrc_t *)OMAP34XX_SDRC_BASE;
 static ctrl_t *ctrl_base = (ctrl_t *)OMAP34XX_CTRL_BASE;
+static char *rev_s[CPU_3XX_MAX_REV] = {
+				"1.0",
+				"2.0",
+				"2.1",
+				"3.0",
+				"3.1"};
 
 /*****************************************************************
  * dieid_num_r(void) - read and set die ID
@@ -76,18 +82,27 @@ u32 get_cpu_type(void)
 u32 get_cpu_rev(void)
 {
 	u32 cpuid = 0;
+	ctrl_id_t *id_base;
 
 	/*
 	 * On ES1.0 the IDCODE register is not exposed on L4
-	 * so using CPU ID to differentiate
-	 * between ES2.0 and ES1.0.
+	 * so using CPU ID to differentiate between ES1.0 and > ES1.0.
 	 */
 	__asm__ __volatile__("mrc p15, 0, %0, c0, c0, 0":"=r"(cpuid));
 	if ((cpuid & 0xf) == 0x0)
-		return CPU_3430_ES1;
-	else
-		return CPU_3430_ES2;
+		return CPU_3XX_ES10;
+	else {
+		/* Decode the IDs on > ES1.0 */
+		id_base = (ctrl_id_t *) OMAP34XX_ID_L4_IO_BASE;
 
+		cpuid = (readl(&id_base->idcode) >> CPU_3XX_ID_SHIFT) & 0xf;
+
+		/* Some early ES2.0 seem to report ID 0, fix this */
+		if(cpuid == 0)
+			cpuid = CPU_3XX_ES20;
+
+		return cpuid;
+	}
 }
 
 /****************************************************
@@ -277,8 +292,8 @@ int print_cpuinfo (void)
 		sec_s = "?";
 	}
 
-	printf("OMAP%s-%s rev %d, CPU-OPP2 L3-165MHz\n", cpu_s,
-	       sec_s, get_cpu_rev());
+	printf("OMAP%s-%s ES%s, CPU-OPP2 L3-165MHz\n",
+			cpu_s, sec_s, rev_s[get_cpu_rev()]);
 
 	return 0;
 }
diff --git a/include/asm-arm/arch-omap3/omap3.h b/include/asm-arm/arch-omap3/omap3.h
index d0d2737..7c11019 100644
--- a/include/asm-arm/arch-omap3/omap3.h
+++ b/include/asm-arm/arch-omap3/omap3.h
@@ -167,12 +167,16 @@ typedef struct gpio {
  * 343x real hardware:
  *  ES1     = rev 0
  *
- * 343x code defines:
- * ES1     = 0+1 = 1
- * ES1     = 1+1 = 1
+ *  ES2 onwards, the value maps to contents of IDCODE register [31:28].
  */
-#define CPU_3430_ES1		1
-#define CPU_3430_ES2		2
+#define CPU_3XX_ES10		0
+#define CPU_3XX_ES20		1
+#define CPU_3XX_ES21		2
+#define CPU_3XX_ES30		3
+#define CPU_3XX_ES31		4
+#define CPU_3XX_MAX_REV		(CPU_3XX_ES31 + 1)
+
+#define CPU_3XX_ID_SHIFT	28
 
 #define WIDTH_8BIT		0x0000
 #define WIDTH_16BIT		0x1000	/* bit pos for 16 bit in gpmc */
-- 
1.6.2.1