On 04/02/2012 05:18 PM, Simon Glass wrote:
> We want to know which type of chip we are running on - the Tegra
> family has several SKUs. This can be determined by reading a
> fuse register, so add this function to ap20.
>
> Signed-off-by: Simon Glass <s...@chromium.org>
> Acked-by: Stephen Warren <swar...@nvidia.com>
> ---
> Changes in v2:
> - Add check of undocumented values in hidrev register
> diff --git a/arch/arm/cpu/armv7/tegra2/ap20.c
> b/arch/arm/cpu/armv7/tegra2/ap20.c
> +int tegra_get_chip_type(void)
> +{
> + struct apb_misc_gp_ctlr *gp;
> + struct fuse_regs *fuse = (struct fuse_regs *)TEGRA2_FUSE_BASE;
> + uint tegra_sku_id, rev;
> +
> + /*
> + * This is undocumented, Chip ID is bits 15:8 of the register
> + * APB_MISC + 0x804, and has value 0x20 for Tegra20, 0x30 for
> + * Tegra30
> + */
> + gp = (struct apb_misc_gp_ctlr *)TEGRA2_APB_MISC_GP_BASE;
> + rev = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK) >> HIDREV_CHIPID_SHIFT;
That's not entirely true; the register and its fields are documented in
the TRM. The values of the CHIPID field itself are indeed not documented.
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