[PATCH] ARM: mach-imx: imx6: Read and print the UID of i.MX6 SOCs

[PATCH] ARM: mach-imx: imx6: Read and print the UID of i.MX6 SOCs

[Stefan Riedmueller]

Read the unified ID of the i.MX 6 SOCs and print it in the boot log.

Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
---
 arch/arm/mach-imx/imx6.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm/mach-imx/imx6.c b/arch/arm/mach-imx/imx6.c
index e898be9ab545..66f3d22a68a7 100644
--- a/arch/arm/mach-imx/imx6.c
+++ b/arch/arm/mach-imx/imx6.c
@@ -23,6 +23,7 @@
 #include <mach/reset-reason.h>
 #include <mach/imx6-anadig.h>
 #include <mach/imx6-regs.h>
+#include <mach/imx6-fusemap.h>
 #include <mach/usb.h>
 #include <asm/mmu.h>
 #include <asm/cache-l2x0.h>
@@ -38,6 +39,9 @@
 #define BM_CLPCR_COSC_PWRDOWN		(0x1 << 11)
 #define BM_CLPCR_BYP_MMDC_CH1_LPM_HS	(0x1 << 21)
 
+#define MX6_OCOTP_CFG0			0x410
+#define MX6_OCOTP_CFG1			0x420
+
 static void imx6_init_lowlevel(void)
 {
 	void __iomem *aips1 = (void *)MX6_AIPS1_ON_BASE_ADDR;
@@ -186,17 +190,30 @@ int imx6_cpu_revision(void)
 	return soc_revision;
 }
 
+static u64 imx6_uid(void)
+{
+	void __iomem *ocotpbase = IOMEM(MX6_OCOTP_BASE_ADDR);
+	u64 uid;
+
+	uid = ((u64)readl(ocotpbase + MX6_OCOTP_CFG0) << 32);
+	uid |= (u64)readl(ocotpbase + MX6_OCOTP_CFG1);
+
+	return uid;
+}
+
 int imx6_init(void)
 {
 	const char *cputypestr;
 	u32 mx6_silicon_revision;
 	void __iomem *src = IOMEM(MX6_SRC_BASE_ADDR);
+	u64 mx6_uid;
 
 	imx6_init_lowlevel();
 
 	imx6_boot_save_loc();
 
 	mx6_silicon_revision = imx6_cpu_revision();
+	mx6_uid = imx6_uid();
 
 	switch (imx6_cpu_type()) {
 	case IMX6_CPUTYPE_IMX6Q:
@@ -236,6 +253,8 @@ int imx6_init(void)
 
 	imx_set_silicon_revision(cputypestr, mx6_silicon_revision);
 	imx_set_reset_reason(src + IMX_SRC_SRSR, imx_reset_reasons);
+	pr_info("%s unique ID: %llx\n", cputypestr, mx6_uid);
+
 	imx6_setup_ipu_qos();
 	imx6ul_enet_clk_init();
 
-- 
2.7.4


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Re: [PATCH] ARM: mach-imx: imx6: Read and print the UID of i.MX6 SOCs

[Sascha Hauer]

Hi Stefan,

On Tue, Jul 02, 2019 at 08:36:37AM +0200, Stefan Riedmueller wrote:
> Read the unified ID of the i.MX 6 SOCs and print it in the boot log.
> 
> Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
> ---
>  arch/arm/mach-imx/imx6.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/imx6.c b/arch/arm/mach-imx/imx6.c
> index e898be9ab545..66f3d22a68a7 100644
> --- a/arch/arm/mach-imx/imx6.c
> +++ b/arch/arm/mach-imx/imx6.c
> @@ -23,6 +23,7 @@
>  #include <mach/reset-reason.h>
>  #include <mach/imx6-anadig.h>
>  #include <mach/imx6-regs.h>
> +#include <mach/imx6-fusemap.h>
>  #include <mach/usb.h>
>  #include <asm/mmu.h>
>  #include <asm/cache-l2x0.h>
> @@ -38,6 +39,9 @@
>  #define BM_CLPCR_COSC_PWRDOWN		(0x1 << 11)
>  #define BM_CLPCR_BYP_MMDC_CH1_LPM_HS	(0x1 << 21)
>  
> +#define MX6_OCOTP_CFG0			0x410
> +#define MX6_OCOTP_CFG1			0x420
> +
>  static void imx6_init_lowlevel(void)
>  {
>  	void __iomem *aips1 = (void *)MX6_AIPS1_ON_BASE_ADDR;
> @@ -186,17 +190,30 @@ int imx6_cpu_revision(void)
>  	return soc_revision;
>  }
>  
> +static u64 imx6_uid(void)
> +{
> +	void __iomem *ocotpbase = IOMEM(MX6_OCOTP_BASE_ADDR);
> +	u64 uid;
> +
> +	uid = ((u64)readl(ocotpbase + MX6_OCOTP_CFG0) << 32);
> +	uid |= (u64)readl(ocotpbase + MX6_OCOTP_CFG1);
> +
> +	return uid;
> +}

I think this function should be exported in case somebody wants to
actually do something with this value other than printing it during
boot.

Sascha


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