[U-Boot] [PATCH] ARM: mx31: Print the silicon version

[Fabio Estevam]

Use the same method of the Linux kernel to print the MX31 silicon version on boot.

Tested on a MX31PDK with a 2.0 silicon, where it shows:

CPU:   Freescale i.MX31 at 531 MHz
MX31 silicon rev 2.0

Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
 arch/arm/cpu/arm1136/mx31/generic.c        |   18 ++++++++++++
 arch/arm/include/asm/arch-mx31/mx31-regs.h |    4 ++
 arch/arm/include/asm/imx_soc_revision.h    |   42 ++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/include/asm/imx_soc_revision.h

diff --git a/arch/arm/cpu/arm1136/mx31/generic.c b/arch/arm/cpu/arm1136/mx31/generic.c
index 8bd23ee..4791449 100644
--- a/arch/arm/cpu/arm1136/mx31/generic.c
+++ b/arch/arm/cpu/arm1136/mx31/generic.c
@@ -24,6 +24,7 @@
 #include <common.h>
 #include <asm/arch/mx31-regs.h>
 #include <asm/io.h>
+#include <asm/imx_soc_revision.h>
 
 static u32 mx31_decode_pll(u32 reg, u32 infreq)
 {
@@ -106,11 +107,28 @@ void mx31_set_pad(enum iomux_pins pin, u32 config)
 
 }
 
+void mx31_read_cpu_rev(void)
+{
+	u32 i, srev;
+
+	/* read SREV register from IIM module */
+	srev = __raw_readl(MX31_IIM_BASE_ADDR + MXC_IIMSREV);
+
+	for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
+		if (srev == mx31_cpu_type[i].srev) {
+			printf("MX31 silicon rev %s\n", mx31_cpu_type[i].v);
+				return;
+		}
+
+	printf("Unknown CPU identifier. srev = %02x\n", srev);
+}
+
 #if defined(CONFIG_DISPLAY_CPUINFO)
 int print_cpuinfo (void)
 {
 	printf("CPU:   Freescale i.MX31 at %d MHz\n",
 		mx31_get_mcu_main_clk() / 1000000);
+	mx31_read_cpu_rev();
 	return 0;
 }
 #endif
diff --git a/arch/arm/include/asm/arch-mx31/mx31-regs.h b/arch/arm/include/asm/arch-mx31/mx31-regs.h
index 37337f2..cc0ffc8 100644
--- a/arch/arm/include/asm/arch-mx31/mx31-regs.h
+++ b/arch/arm/include/asm/arch-mx31/mx31-regs.h
@@ -480,6 +480,10 @@ enum iomux_pins {
 #define CCMR_FPM	(1 << 1)
 #define CCMR_CKIH	(2 << 1)
 
+#define MX31_SPBA0_BASE_ADDR	0x50000000
+#define MX31_IIM_BASE_ADDR	(MX31_SPBA0_BASE_ADDR + 0x1c000)
+#define MXC_IIMSREV             0x0024
+
 #define PDR0_CSI_PODF(x)	(((x) & 0x1ff) << 23)
 #define PDR0_PER_PODF(x)	(((x) & 0x1f) << 16)
 #define PDR0_HSP_PODF(x)	(((x) & 0x7) << 11)
diff --git a/arch/arm/include/asm/imx_soc_revision.h b/arch/arm/include/asm/imx_soc_revision.h
new file mode 100644
index 0000000..01219c6
--- /dev/null
+++ b/arch/arm/include/asm/imx_soc_revision.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc.
+ *
+ * Fabio Estevam <fabio.estevam at freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ */
+
+#define IMX_CHIP_REVISION_1_0		0x10
+#define IMX_CHIP_REVISION_1_1		0x11
+#define IMX_CHIP_REVISION_1_2		0x12
+#define IMX_CHIP_REVISION_1_3		0x13
+#define IMX_CHIP_REVISION_2_0		0x20
+#define IMX_CHIP_REVISION_2_1		0x21
+#define IMX_CHIP_REVISION_2_2		0x22
+#define IMX_CHIP_REVISION_2_3		0x23
+#define IMX_CHIP_REVISION_3_0		0x30
+#define IMX_CHIP_REVISION_3_1		0x31
+#define IMX_CHIP_REVISION_3_2		0x32
+#define IMX_CHIP_REVISION_3_3		0x33
+#define IMX_CHIP_REVISION_UNKNOWN	0xff
+
+struct mx3_cpu_type {
+	u8 srev;
+	const char *name;
+	const char *v;
+	unsigned int rev;
+};
+
+struct mx3_cpu_type mx31_cpu_type[] = {
+	{ .srev = 0x00, .name = "i.MX31(L)", .v = "1.0",  .rev = IMX_CHIP_REVISION_1_0	},
+	{ .srev = 0x10, .name = "i.MX31",    .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1	},
+	{ .srev = 0x11, .name = "i.MX31L",   .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1	},
+	{ .srev = 0x12, .name = "i.MX31",    .v = "1.15", .rev = IMX_CHIP_REVISION_1_1	},
+	{ .srev = 0x13, .name = "i.MX31L",   .v = "1.15", .rev = IMX_CHIP_REVISION_1_1	},
+	{ .srev = 0x14, .name = "i.MX31",    .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2	},
+	{ .srev = 0x15, .name = "i.MX31L",   .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2	},
+	{ .srev = 0x28, .name = "i.MX31",    .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0	},
+	{ .srev = 0x29, .name = "i.MX31L",   .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0	},
+};
-- 
1.6.0.4