[PATCH] Add support for OMAP4460 revision detection.

[Robert P. J. Day]

  Without yet adding in the underlying code, extend the revision
checking code to return additional values for PandaBoard ES boards.
Much of the code was taken close to verbatim from U-Boot.

Signed-off-by: Robert P. J. Day <rpjday at crashcourse.ca>

-- 

  compile tested, and confirmed that this code behaves identically to
the original panda configure and build for the three pandas i have:

  * Rev A2 (boots)
  * Rev EA3 (boots)
  * Rev B1 ES (no output)

so while there's still work to be done, this at least represents the
necessary infrastructure to start *recognizing* panda ES boards.

diff --git a/arch/arm/mach-omap/include/mach/omap4-silicon.h b/arch/arm/mach-omap/include/mach/omap4-silicon.h
index db0dfdf..4a98f45 100644
--- a/arch/arm/mach-omap/include/mach/omap4-silicon.h
+++ b/arch/arm/mach-omap/include/mach/omap4-silicon.h
@@ -156,6 +156,9 @@ struct s32ktimer {
 #define OMAP4430_ES2_0	2
 #define OMAP4430_ES2_1	3
 #define OMAP4430_ES2_2	4
+#define OMAP4430_ES2_3	5
+#define OMAP4460_ES1_0	6
+#define OMAP4460_ES1_1	7

 struct ddr_regs {
 	u32 tim1;
diff --git a/arch/arm/mach-omap/omap4_generic.c b/arch/arm/mach-omap/omap4_generic.c
index 5223c7e..1afd00d 100644
--- a/arch/arm/mach-omap/omap4_generic.c
+++ b/arch/arm/mach-omap/omap4_generic.c
@@ -7,6 +7,26 @@
 #include <mach/syslib.h>
 #include <mach/xload.h>

+/*
+ *  The following several lines are taken from U-Boot to support
+ * recognizing more revisions of OMAP4 chips.
+ */
+
+#define MIDR_CORTEX_A9_R0P1	0x410FC091
+#define MIDR_CORTEX_A9_R1P2	0x411FC092
+#define MIDR_CORTEX_A9_R1P3	0x411FC093
+#define MIDR_CORTEX_A9_R2P10	0x412FC09A
+
+#define CONTROL_ID_CODE         0x4A002204
+
+#define OMAP4_CONTROL_ID_CODE_ES1_0     0x0B85202F
+#define OMAP4_CONTROL_ID_CODE_ES2_0     0x1B85202F
+#define OMAP4_CONTROL_ID_CODE_ES2_1     0x3B95C02F
+#define OMAP4_CONTROL_ID_CODE_ES2_2     0x4B95C02F
+#define OMAP4_CONTROL_ID_CODE_ES2_3     0x6B95C02F
+#define OMAP4460_CONTROL_ID_CODE_ES1_0  0x0B94E02F
+#define OMAP4460_CONTROL_ID_CODE_ES1_1  0x2B94E02F
+
 void __noreturn reset_cpu(unsigned long addr)
 {
 	writel(PRM_RSTCTRL_RESET, PRM_RSTCTRL);
@@ -359,22 +379,45 @@ static unsigned int cortex_a9_rev(void)

 unsigned int omap4_revision(void)
 {
-	unsigned int chip_rev = 0;
 	unsigned int rev = cortex_a9_rev();

 	switch(rev) {
-	case 0x410FC091:
+	case MIDR_CORTEX_A9_R0P1:
 		return OMAP4430_ES1_0;
-	case 0x411FC092:
-		chip_rev = (readl(OMAP44XX_CTRL_BASE + 0x204)  >> 28) & 0xF;
-		if (chip_rev == 3)
+	case MIDR_CORTEX_A9_R1P2:
+		switch (readl(CONTROL_ID_CODE)) {
+		case OMAP4_CONTROL_ID_CODE_ES2_0:
+			return OMAP4430_ES2_0;
+			break;
+		case OMAP4_CONTROL_ID_CODE_ES2_1:
 			return OMAP4430_ES2_1;
-		else if (chip_rev >= 4)
+			break;
+		case OMAP4_CONTROL_ID_CODE_ES2_2:
 			return OMAP4430_ES2_2;
-		else
+			break;
+		default:
 			return OMAP4430_ES2_0;
+			break;
+		}
+		break;
+	case MIDR_CORTEX_A9_R1P3:
+		return OMAP4430_ES2_3;
+		break;
+	case MIDR_CORTEX_A9_R2P10:
+		switch (readl(CONTROL_ID_CODE)) {
+		case OMAP4460_CONTROL_ID_CODE_ES1_1:
+			return OMAP4460_ES1_1;
+			break;
+		case OMAP4460_CONTROL_ID_CODE_ES1_0:
+		default:
+			return OMAP4460_ES1_0;
+			break;
+		}
+		break;
+	default:
+		return OMAP4430_SILICON_ID_INVALID;
+		break;
 	}
-	return OMAP4430_SILICON_ID_INVALID;
 }

 /*



-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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