From: festevam@gmail.com (Fabio Estevam)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] ARM: mx51: Print silicon revision on boot
Date: Thu, 3 Mar 2011 21:22:04 -0300 [thread overview]
Message-ID: <1299198124-4064-1-git-send-email-festevam@gmail.com> (raw)
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>
---
Changes since v1:
- Added patch description
arch/arm/mach-mx5/clock-mx51-mx53.c | 1 +
arch/arm/mach-mx5/cpu.c | 21 +++++++++++++++++++++
arch/arm/plat-mxc/include/mach/mx51.h | 1 +
3 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
index 652ace4..1282a60 100644
--- a/arch/arm/mach-mx5/clock-mx51-mx53.c
+++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
@@ -1510,6 +1510,7 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
clk_enable(&iim_clk);
mx51_revision();
+ mx51_display_revision();
clk_disable(&iim_clk);
/* move usb_phy_clk to 24MHz */
diff --git a/arch/arm/mach-mx5/cpu.c b/arch/arm/mach-mx5/cpu.c
index df46b5e..565ed4d 100644
--- a/arch/arm/mach-mx5/cpu.c
+++ b/arch/arm/mach-mx5/cpu.c
@@ -51,6 +51,27 @@ 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 = "2.0";
+ break;
+ case IMX_CHIP_REVISION_3_0:
+ srev = "3.0";
+ break;
+ default:
+ return IMX_CHIP_REVISION_UNKNOWN;
+ srev = "unknown";
+ }
+ 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
--- 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 */
--
1.6.0.4
reply other threads:[~2011-03-04 0:22 UTC|newest]
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