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| author | Simon Glass <sjg@chromium.org> | 2012-04-02 13:18:50 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-05-15 08:31:37 +0200 |
| commit | d515362d4d6f83be818f71d37a4600041a520ab5 (patch) | |
| tree | 30b7c1e6fc2c319377369ba1eebf815fead3dcb3 /arch/arm/cpu | |
| parent | f6f767a4040110b400726e9859ea51a7ade10474 (diff) | |
| download | u-boot-imx-d515362d4d6f83be818f71d37a4600041a520ab5.zip u-boot-imx-d515362d4d6f83be818f71d37a4600041a520ab5.tar.gz u-boot-imx-d515362d4d6f83be818f71d37a4600041a520ab5.tar.bz2 | |
tegra: Add tegra_get_chip_type() to detect SKU
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 <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/armv7/tegra2/ap20.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/tegra2/ap20.c b/arch/arm/cpu/armv7/tegra2/ap20.c index a6dd3e4..150fbfd 100644 --- a/arch/arm/cpu/armv7/tegra2/ap20.c +++ b/arch/arm/cpu/armv7/tegra2/ap20.c @@ -26,11 +26,47 @@ #include <asm/arch/ap20.h> #include <asm/arch/clk_rst.h> #include <asm/arch/clock.h> +#include <asm/arch/fuse.h> +#include <asm/arch/gp_padctrl.h> #include <asm/arch/pmc.h> #include <asm/arch/pinmux.h> #include <asm/arch/scu.h> #include <common.h> +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; + + tegra_sku_id = readl(&fuse->sku_info) & 0xff; + + switch (rev) { + case CHIPID_TEGRA2: + switch (tegra_sku_id) { + case SKU_ID_T20: + return TEGRA_SOC_T20; + case SKU_ID_T25SE: + case SKU_ID_AP25: + case SKU_ID_T25: + case SKU_ID_AP25E: + case SKU_ID_T25E: + return TEGRA_SOC_T25; + } + break; + } + /* unknown sku id */ + return TEGRA_SOC_UNKNOWN; +} + /* Returns 1 if the current CPU executing is a Cortex-A9, else 0 */ static int ap20_cpu_is_cortexa9(void) { |