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ARM: mx27: Print silicon revision on boot 

Silicon revision is useful information to have during kernel boot.

Print the MX27 silicon revision.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Jason Liu <jason.hui@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jason Liu 2011-08-26 13:35:20 +08:00 committed by Sascha Hauer
parent d27536c661
commit 3f5492c513
2 changed files with 15 additions and 15 deletions
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2
arch/arm/mach-imx/clock-imx27.c
View File

@ -751,6 +751,8 @@ int __init mx27_clocks_init(unsigned long fref)
clk_enable(&gpio_clk);
clk_enable(&emi_clk);
clk_enable(&iim_clk);
imx_print_silicon_rev("i.MX27", mx27_revision());
clk_disable(&iim_clk);
#if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
clk_enable(&uart1_clk);

28
arch/arm/mach-imx/cpu-imx27.c
View File

@ -26,12 +26,12 @@
#include <mach/hardware.h>
static int cpu_silicon_rev = -1;
static int cpu_partnumber;
static int mx27_cpu_rev = -1;
static int mx27_cpu_partnumber;
#define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */
static void query_silicon_parameter(void)
static int mx27_read_cpu_rev(void)
{
u32 val;
/*
@ -42,20 +42,18 @@ static void query_silicon_parameter(void)
val = __raw_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR
+ SYS_CHIP_ID));
mx27_cpu_partnumber = (int)((val >> 12) & 0xFFFF);
switch (val >> 28) {
case 0:
cpu_silicon_rev = IMX_CHIP_REVISION_1_0;
break;
return IMX_CHIP_REVISION_1_0;
case 1:
cpu_silicon_rev = IMX_CHIP_REVISION_2_0;
break;
return IMX_CHIP_REVISION_2_0;
case 2:
cpu_silicon_rev = IMX_CHIP_REVISION_2_1;
break;
return IMX_CHIP_REVISION_2_1;
default:
cpu_silicon_rev = IMX_CHIP_REVISION_UNKNOWN;
return IMX_CHIP_REVISION_UNKNOWN;
}
cpu_partnumber = (int)((val >> 12) & 0xFFFF);
}
/*
@ -65,12 +63,12 @@ static void query_silicon_parameter(void)
*/
int mx27_revision(void)
{
if (cpu_silicon_rev == -1)
query_silicon_parameter();
if (mx27_cpu_rev == -1)
mx27_cpu_rev = mx27_read_cpu_rev();
if (cpu_partnumber != 0x8821)
if (mx27_cpu_partnumber != 0x8821)
return -EINVAL;
return cpu_silicon_rev;
return mx27_cpu_rev;
}
EXPORT_SYMBOL(mx27_revision);