2015-05-14 7:11 GMT+02:00 Tim Harvey <thar...@gateworks.com>:
> The MX6 has a temperature grade defined by OCOTP_MEM0[7:6] which is at 0x480
> in the Fusemap Description Table in the reference manual. Return this value
> as well as min/max temperature based on the value.
>
> Note that the IMX6SDLRM and the IMX6SXRM do not indicate this in the
> their Fusemap Description Table however Freescale has confirmed that these
> eFUSE bits match the description within the IMX6DQRM and that they will
> be added to the next revision of the respective reference manuals.
>
> This has been tested with IMX6 Automative and Industrial parts.
>
> Signed-off-by: Tim Harvey <thar...@gateworks.com>
> ---
> v2:
> - split out adding get_cpu_temp_grade to its own patch
> - added note about support of MX6SDL and MX6SX
>
> Signed-off-by: Tim Harvey <thar...@gateworks.com>
> ---
> arch/arm/cpu/armv7/mx6/soc.c | 38
> +++++++++++++++++++++++++++++++
> arch/arm/include/asm/arch-mx6/sys_proto.h | 1 +
> include/imx_thermal.h | 6 +++++
> 3 files changed, 45 insertions(+)
>
> diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
> index 71fa1fb..6f501ac 100644
> --- a/arch/arm/cpu/armv7/mx6/soc.c
> +++ b/arch/arm/cpu/armv7/mx6/soc.c
> @@ -124,6 +124,44 @@ u32 get_cpu_speed_grade_hz(void)
> return 0;
> }
>
> +/*
> + * OCOTP_MEM0[7:6] (see Fusemap Description Table offset 0x480)
> + * defines a 2-bit Temperature Grade
> + *
> + * return temperature grade and min/max temperature in celcius
> + */
> +#define OCOTP_MEM0_TEMP_SHIFT 6
> +
> +u32 get_cpu_temp_grade(int *minc, int *maxc)
> +{
> + struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
> + struct fuse_bank *bank = &ocotp->bank[1];
> + struct fuse_bank1_regs *fuse =
> + (struct fuse_bank1_regs *)bank->fuse_regs;
> + uint32_t val;
> +
> + val = readl(&fuse->mem0);
> + val >>= OCOTP_MEM0_TEMP_SHIFT;
> + val &= 0x3;
> +
> + if (minc && maxc) {
> + if (val == TEMP_AUTOMOTIVE) {
> + *minc = -40;
> + *maxc = 125;
> + } else if (val == TEMP_INDUSTRIAL) {
> + *minc = -40;
> + *maxc = 105;
> + } else if (val == TEMP_EXTCOMMERCIAL) {
> + *minc = -20;
> + *maxc = 105;
> + } else {
> + *minc = 0;
> + *maxc = 95;
> + }
> + }
> + return val;
> +}
> +
> #ifdef CONFIG_REVISION_TAG
> u32 __weak get_board_rev(void)
> {
> diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h
> b/arch/arm/include/asm/arch-mx6/sys_proto.h
> index a2cd0a9..c583291 100644
> --- a/arch/arm/include/asm/arch-mx6/sys_proto.h
> +++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
> @@ -17,6 +17,7 @@
> u32 get_nr_cpus(void);
> u32 get_cpu_rev(void);
> u32 get_cpu_speed_grade_hz(void);
> +u32 get_cpu_temp_grade(int *minc, int *maxc);
>
> /* returns MXC_CPU_ value */
> #define cpu_type(rev) (((rev) >> 12)&0xff)
> diff --git a/include/imx_thermal.h b/include/imx_thermal.h
> index be13652..8ce333c 100644
> --- a/include/imx_thermal.h
> +++ b/include/imx_thermal.h
> @@ -8,6 +8,12 @@
> #ifndef _IMX_THERMAL_H_
> #define _IMX_THERMAL_H_
>
> +/* CPU Temperature Grades */
> +#define TEMP_COMMERCIAL 0
> +#define TEMP_EXTCOMMERCIAL 1
> +#define TEMP_INDUSTRIAL 2
> +#define TEMP_AUTOMOTIVE 3
> +
> struct imx_thermal_plat {
> void *regs;
> int fuse_bank;
> --
> 1.9.1
>
Reviewed-by: Christian Gmeiner <christian.gmei...@gmail.com>
greets
--
Christian Gmeiner, MSc
https://soundcloud.com/christian-gmeiner
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