[[PATCH v3 3/6] ARM: mx27: Print silicon revision on boot
From: Jason Liu <hidden>
Date: 2011-08-26 05:35:20
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Silicon revision is useful information to have during kernel boot. Print the MX27 silicon revision. Signed-off-by: Fabio Estevam <redacted> Signed-off-by: Jason Liu <redacted> Cc: Sascha Hauer <s.hauer@pengutronix.de> --- Resend: The patch based on Fabio initial patch, I did some change to use generic function for displaying silicon revision and also some naming change to avoid using the generic name --- arch/arm/mach-imx/clock-imx27.c | 2 ++ arch/arm/mach-imx/cpu-imx27.c | 28 +++++++++++++--------------- 2 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch/arm/mach-imx/clock-imx27.c b/arch/arm/mach-imx/clock-imx27.c
index 6912b82..e6b1beb 100644
--- a/arch/arm/mach-imx/clock-imx27.c
+++ b/arch/arm/mach-imx/clock-imx27.c@@ -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);
diff --git a/arch/arm/mach-imx/cpu-imx27.c b/arch/arm/mach-imx/cpu-imx27.c
index 3b117be..ff38e15 100644
--- a/arch/arm/mach-imx/cpu-imx27.c
+++ b/arch/arm/mach-imx/cpu-imx27.c@@ -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);
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1.7.4.1