diff options
| author | Leonard Crestez <leonard.crestez@nxp.com> | 2019-10-30 01:17:39 +0200 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-11-04 11:32:12 +0800 |
| commit | 768e1a8e093677f5e0e7d0a447c1a856c16cbb66 (patch) | |
| tree | 467379ad963d6fa9b97813c1f418daae20931f84 /drivers/soc | |
| parent | 7ae399b7d009c7348b9451ac41cd49671b31cf3a (diff) | |
soc: imx8mq: Read SOC revision from TF-A
SOC revision on older imx8mq is not available in fuses so on anything
other than B1 current code just reports "unknown".
TF-A already handles this by parsing the ROM and exposes the value
through a SMC call. Call this instead of reimplementing the workaround
in the kernel itself.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/soc')
| -rw-r--r-- | drivers/soc/imx/soc-imx8.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c index fcbf745a9971..d84ed736cdb0 100644 --- a/drivers/soc/imx/soc-imx8.c +++ b/drivers/soc/imx/soc-imx8.c @@ -9,6 +9,7 @@ #include <linux/slab.h> #include <linux/sys_soc.h> #include <linux/platform_device.h> +#include <linux/arm-smccc.h> #include <linux/of.h> #define REV_B1 0x21 @@ -16,6 +17,8 @@ #define IMX8MQ_SW_INFO_B1 0x40 #define IMX8MQ_SW_MAGIC_B1 0xff0055aa +#define IMX_SIP_GET_SOC_INFO 0xc2000006 + #define OCOTP_UID_LOW 0x410 #define OCOTP_UID_HIGH 0x420 @@ -29,6 +32,22 @@ struct imx8_soc_data { static u64 soc_uid; +#ifdef CONFIG_HAVE_ARM_SMCCC +static u32 imx8mq_soc_revision_from_atf(void) +{ + struct arm_smccc_res res; + + arm_smccc_smc(IMX_SIP_GET_SOC_INFO, 0, 0, 0, 0, 0, 0, 0, &res); + + if (res.a0 == SMCCC_RET_NOT_SUPPORTED) + return 0; + else + return res.a0 & 0xff; +} +#else +static inline u32 imx8mq_soc_revision_from_atf(void) { return 0; }; +#endif + static u32 __init imx8mq_soc_revision(void) { struct device_node *np; @@ -43,9 +62,16 @@ static u32 __init imx8mq_soc_revision(void) ocotp_base = of_iomap(np, 0); WARN_ON(!ocotp_base); - magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1); - if (magic == IMX8MQ_SW_MAGIC_B1) - rev = REV_B1; + /* + * SOC revision on older imx8mq is not available in fuses so query + * the value from ATF instead. + */ + rev = imx8mq_soc_revision_from_atf(); + if (!rev) { + magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1); + if (magic == IMX8MQ_SW_MAGIC_B1) + rev = REV_B1; + } soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH); soc_uid <<= 32; |