ARM: mx35: Add mx35_revision function to query the silicon revision

Based on work done earlier by Sascha Hauer

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Eric Bénard <eric@eukrea.com>
[ukl: actually squash the two approaches together]
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

4 files changed, 43 insertions, 15 deletions

diff --git a/arch/arm/mach-mx3/clock-imx35.c b/arch/arm/mach-mx3/clock-imx35.c
index f08b407cdb3f..9a1009884164 100644
--- a/arch/arm/mach-mx3/clock-imx35.c
+++ b/arch/arm/mach-mx3/clock-imx35.c
@@ -535,6 +535,9 @@ int __init mx35_clocks_init()
         __raw_writel(cgr2, CCM_BASE + CCM_CGR2);
         __raw_writel(cgr3, CCM_BASE + CCM_CGR3);
 
+        clk_enable(&iim_clk);
+        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 47b0573c11f5..d00a75457812 100644
--- a/arch/arm/mach-mx3/cpu.c
+++ b/arch/arm/mach-mx3/cpu.c
@@ -55,3 +55,30 @@ 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);
+
+void __init mx35_read_cpu_rev(void)
+{
+        u32 rev;
+        char *srev = "unknown";
+
+        rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
+        switch (rev) {
+        case 0x00:
+                mx35_cpu_rev = MX3x_CHIP_REV_1_0;
+                srev = "1.0";
+                break;
+        case 0x10:
+                mx35_cpu_rev = MX3x_CHIP_REV_2_0;
+                srev = "2.0";
+                break;
+        case 0x11:
+                mx35_cpu_rev = MX3x_CHIP_REV_2_1;
+                srev = "2.1";
+                break;
+        }
+
+        printk(KERN_INFO "CPU identified as i.MX35, silicon rev %s\n", srev);
+}
diff --git a/arch/arm/plat-mxc/include/mach/mx35.h b/arch/arm/plat-mxc/include/mach/mx35.h
index 5a1c621aeba1..cb071b7b17e5 100644
--- a/arch/arm/plat-mxc/include/mach/mx35.h
+++ b/arch/arm/plat-mxc/include/mach/mx35.h
@@ -1,5 +1,6 @@
 #ifndef __MACH_MX35_H__
 #define __MACH_MX35_H__
+
 /*
  * IRAM
  */
@@ -66,6 +67,8 @@
 #define MX35_CAN1_BASE_ADDR                     (MX35_AIPS2_BASE_ADDR + 0xe4000)
 #define MX35_CAN2_BASE_ADDR                     (MX35_AIPS2_BASE_ADDR + 0xe8000)
 #define MX35_RTIC_BASE_ADDR                     (MX35_AIPS2_BASE_ADDR + 0xec000)
+#define MX35_IIM_BASE_ADDR                      (MX35_AIPS2_BASE_ADDR + 0xf0000)
+
 #define MX35_OTG_BASE_ADDR              0x53ff4000
 
 #define MX35_ROMP_BASE_ADDR             0x60000000
@@ -187,20 +190,7 @@
 
 #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
-
-#define MX35_SYSTEM_REV_MIN             MX35_CHIP_REV_1_0
+#define MX35_SYSTEM_REV_MIN             MX3x_CHIP_REV_1_0
 #define MX35_SYSTEM_REV_NUM             3
 
 #ifdef IMX_NEEDS_DEPRECATED_SYMBOLS
diff --git a/arch/arm/plat-mxc/include/mach/mx3x.h b/arch/arm/plat-mxc/include/mach/mx3x.h
index d41ad68c1315..d1bd26d7b8a6 100644
--- a/arch/arm/plat-mxc/include/mach/mx3x.h
+++ b/arch/arm/plat-mxc/include/mach/mx3x.h
@@ -240,7 +240,7 @@
 
 #define MX3x_PROD_SIGNATURE             0x1     /* For MX31 */
 
-/* silicon revisions specific to i.MX31 */
+/* silicon revisions specific to i.MX31 and i.MX35 */
 #define MX3x_CHIP_REV_1_0               0x10
 #define MX3x_CHIP_REV_1_1               0x11
 #define MX3x_CHIP_REV_1_2               0x12
@@ -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