Subject: [PATCH] i.MX35: Add mx35_revision function to query the silicon revision

From: [email-masked] (Sascha Hauer)
Date: Thu, 7 Oct 2010 11:14:13 +0200

Signed-off-by: Sascha Hauer <[email-masked]>
---
 arch/arm/mach-mx3/clock-imx35.c       |    2 ++
 arch/arm/mach-mx3/cpu.c               |   32 ++++++++++++++++++++++++++++++++
 arch/arm/plat-mxc/include/mach/mx35.h |   19 +++++++------------
 arch/arm/plat-mxc/include/mach/mx3x.h |    8 ++++++++
 4 files changed, 49 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-mx3/clock-imx35.c b/arch/arm/mach-mx3/clock-imx35.c
index dcabed0..2b1d129 100644
--- a/arch/arm/mach-mx3/clock-imx35.c
+++ b/arch/arm/mach-mx3/clock-imx35.c
@@ -535,6 +535,8 @@ int __init mx35_clocks_init()
 	__raw_writel(cgr2, CCM_BASE + CCM_CGR2);
 	__raw_writel(cgr3, CCM_BASE + CCM_CGR3);
 
+	mx35_read_cpu_rev();
+
 #ifdef CONFIG_MXC_USE_EPIT
 	epit_timer_init(&epit1_clk,
 			MX35_IO_ADDRESS(MX35_EPIT1_BASE_ADDR), MX35_INT_EPIT1);
diff --git a/arch/arm/mach-mx3/cpu.c b/arch/arm/mach-mx3/cpu.c
index 861afe0..161dfff 100644
--- a/arch/arm/mach-mx3/cpu.c
+++ b/arch/arm/mach-mx3/cpu.c
@@ -55,3 +55,35 @@ void __init mx31_read_cpu_rev(void)
 
 	printk(KERN_WARNING "Unknown CPU identifier. srev = %02x\n", srev);
 }
+
+unsigned int mx35_cpu_rev;
+EXPORT_SYMBOL(mx35_cpu_rev);
+
+#define MX35_ROM_SI_REV		0x40
+
+void __init mx35_read_cpu_rev(void)
+{
+	void __iomem *rom = ioremap(MX35_IROM_BASE_ADDR, MX35_IROM_SIZE);
+	u32 rev;
+	char *srev = "unknown";
+
+	if (!rom)
+		return;
+
+	rev = readl(rom + MX35_ROM_SI_REV);
+	switch (rev) {
+	case 0x1:
+		mx35_cpu_rev = MX35_CHIP_REV_1_0;
+		srev = "1.0";
+		break;
+	case 0x2:
+		mx35_cpu_rev = MX35_CHIP_REV_2_0;
+		srev = "2.0";
+		break;
+	}
+
+	printk(KERN_INFO "CPU identified as i.MX35, silicon rev %s\n", srev);
+
+	iounmap(rom);
+}
+
diff --git a/arch/arm/plat-mxc/include/mach/mx35.h b/arch/arm/plat-mxc/include/mach/mx35.h
index 9f0a1ee..f740455 100644
--- a/arch/arm/plat-mxc/include/mach/mx35.h
+++ b/arch/arm/plat-mxc/include/mach/mx35.h
@@ -1,5 +1,9 @@
 #ifndef __MACH_MX35_H__
 #define __MACH_MX35_H__
+
+#define MX35_IROM_BASE_ADDR		0x0
+#define MX35_IROM_SIZE			SZ_16K
+
 /*
  * IRAM
  */
@@ -184,18 +188,9 @@
 
 #define MX35_PROD_SIGNATURE		0x1	/* For MX31 */
 
-/* silicon revisions specific to i.MX31 */
-#define MX35_CHIP_REV_1_0		0x10
-#define MX35_CHIP_REV_1_1		0x11
-#define MX35_CHIP_REV_1_2		0x12
-#define MX35_CHIP_REV_1_3		0x13
-#define MX35_CHIP_REV_2_0		0x20
-#define MX35_CHIP_REV_2_1		0x21
-#define MX35_CHIP_REV_2_2		0x22
-#define MX35_CHIP_REV_2_3		0x23
-#define MX35_CHIP_REV_3_0		0x30
-#define MX35_CHIP_REV_3_1		0x31
-#define MX35_CHIP_REV_3_2		0x32
+/* silicon revisions specific to i.MX35 */
+#define MX35_CHIP_REV_1_0		0x1
+#define MX35_CHIP_REV_2_0		0x2
 
 #define MX35_SYSTEM_REV_MIN		MX35_CHIP_REV_1_0
 #define MX35_SYSTEM_REV_NUM		3
diff --git a/arch/arm/plat-mxc/include/mach/mx3x.h b/arch/arm/plat-mxc/include/mach/mx3x.h
index 7a356de3..581db46 100644
--- a/arch/arm/plat-mxc/include/mach/mx3x.h
+++ b/arch/arm/plat-mxc/include/mach/mx3x.h
@@ -267,6 +267,14 @@ static inline int mx31_revision(void)
 {
 	return mx31_cpu_rev;
 }
+
+extern unsigned int mx35_cpu_rev;
+extern void mx35_read_cpu_rev(void);
+
+static inline int mx35_revision(void)
+{
+	return mx35_cpu_rev;
+}
 #endif
 
 #ifdef IMX_NEEDS_DEPRECATED_SYMBOLS
-- 
1.7.2.3

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