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soc: imx: add i.MX51/i.MX53 unique id support

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i.MX51 and i.MX53 SoCs have a 64-bit SoC unique ID stored in IIM,
which can be used as SoC serial number. The same feature is already
implemented for i.MX6/i.MX7, so this complements support to earlier
SoCs.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Sebastian Reichel 2021-01-27 18:40:24 +01:00 committed by Shawn Guo
parent a38fd87484
commit 1168935b96
1 changed files with 12 additions and 0 deletions
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12
drivers/soc/imx/soc-imx.c
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@ -13,6 +13,8 @@
#include <soc/imx/cpu.h>
#include <soc/imx/revision.h>
#define IIM_UID 0x820
#define OCOTP_UID_H 0x420
#define OCOTP_UID_L 0x410
@ -32,6 +34,7 @@ static int __init imx_soc_device_init(void)
u64 soc_uid = 0;
u32 val;
int ret;
int i;
if (of_machine_is_compatible("fsl,ls1021a"))
return 0;
@ -68,9 +71,11 @@ static int __init imx_soc_device_init(void)
soc_id = "i.MX35";
break;
case MXC_CPU_MX51:
ocotp_compat = "fsl,imx51-iim";
soc_id = "i.MX51";
break;
case MXC_CPU_MX53:
ocotp_compat = "fsl,imx53-iim";
soc_id = "i.MX53";
break;
case MXC_CPU_IMX6SL:
@ -153,6 +158,13 @@ static int __init imx_soc_device_init(void)
regmap_read(ocotp, OCOTP_ULP_UID_1, &val);
soc_uid <<= 16;
soc_uid |= val & 0xffff;
} else if (__mxc_cpu_type == MXC_CPU_MX51 ||
__mxc_cpu_type == MXC_CPU_MX53) {
for (i=0; i < 8; i++) {
regmap_read(ocotp, IIM_UID + i*4, &val);
soc_uid <<= 8;
soc_uid |= (val & 0xff);
}
} else {
regmap_read(ocotp, OCOTP_UID_H, &val);
soc_uid = val;