ARM: mx51: Print silicon revision on boot

Having the silicon revision to appear on the boot log is a useful information.

MX31 and MX35 already show the silicon revision on boot.

Add support for displaying such information for MX51 as well.

Tested on a MX51EVK, where it shows:

CPU identified as i.MX51, silicon rev 3.0

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
index 652ace4..cc6ad1c 100644 (file)
--- a/arch/arm/mach-mx5/clock-mx51-mx53.c
+++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
@@ -1511,6 +1511,7 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
        clk_enable(&iim_clk);
        mx51_revision();
        clk_disable(&iim_clk);
+       mx51_display_revision();
 
        /* move usb_phy_clk to 24MHz */
        clk_set_parent(&usb_phy1_clk, &osc_clk);

diff --git a/arch/arm/mach-mx5/cpu.c b/arch/arm/mach-mx5/cpu.c
index df46b5e..3b4c307 100644 (file)
--- a/arch/arm/mach-mx5/cpu.c
+++ b/arch/arm/mach-mx5/cpu.c
@@ -51,6 +51,26 @@ int mx51_revision(void)
 }
 EXPORT_SYMBOL(mx51_revision);
 
+void mx51_display_revision(void)
+{
+       int rev;
+       char *srev;
+       rev = mx51_revision();
+
+       switch (rev) {
+       case IMX_CHIP_REVISION_2_0:
+               srev = IMX_CHIP_REVISION_2_0_STRING;
+               break;
+       case IMX_CHIP_REVISION_3_0:
+               srev = IMX_CHIP_REVISION_3_0_STRING;
+               break;
+       default:
+               srev = IMX_CHIP_REVISION_UNKNOWN_STRING;
+       }
+       printk(KERN_INFO "CPU identified as i.MX51, silicon rev %s\n", srev);
+}
+EXPORT_SYMBOL(mx51_display_revision);
+
 #ifdef CONFIG_NEON
 
 /*

diff --git a/arch/arm/plat-mxc/include/mach/mx51.h b/arch/arm/plat-mxc/include/mach/mx51.h
index 1eb339e..dede19a 100644 (file)
--- a/arch/arm/plat-mxc/include/mach/mx51.h
+++ b/arch/arm/plat-mxc/include/mach/mx51.h
@@ -347,6 +347,7 @@
 
 #if !defined(__ASSEMBLY__) && !defined(__MXC_BOOT_UNCOMPRESS)
 extern int mx51_revision(void);
+extern void mx51_display_revision(void);
 #endif
 
 /* tape-out 1 defines */

diff --git a/arch/arm/plat-mxc/include/mach/mxc.h b/arch/arm/plat-mxc/include/mach/mxc.h
index 7e07263..3322c7a 100644 (file)
--- a/arch/arm/plat-mxc/include/mach/mxc.h
+++ b/arch/arm/plat-mxc/include/mach/mxc.h
@@ -51,6 +51,20 @@
 #define IMX_CHIP_REVISION_3_3          0x33
 #define IMX_CHIP_REVISION_UNKNOWN      0xff
 
+#define IMX_CHIP_REVISION_1_0_STRING           "1.0"
+#define IMX_CHIP_REVISION_1_1_STRING           "1.1"
+#define IMX_CHIP_REVISION_1_2_STRING           "1.2"
+#define IMX_CHIP_REVISION_1_3_STRING           "1.3"
+#define IMX_CHIP_REVISION_2_0_STRING           "2.0"
+#define IMX_CHIP_REVISION_2_1_STRING           "2.1"
+#define IMX_CHIP_REVISION_2_2_STRING           "2.2"
+#define IMX_CHIP_REVISION_2_3_STRING           "2.3"
+#define IMX_CHIP_REVISION_3_0_STRING           "3.0"
+#define IMX_CHIP_REVISION_3_1_STRING           "3.1"
+#define IMX_CHIP_REVISION_3_2_STRING           "3.2"
+#define IMX_CHIP_REVISION_3_3_STRING           "3.3"
+#define IMX_CHIP_REVISION_UNKNOWN_STRING       "unknown"
+
 #ifndef __ASSEMBLY__
 extern unsigned int __mxc_cpu_type;
 #endif