9 Apr
2012
9 Apr
'12
11:09 p.m.
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 sjg@chromium.org Acked-by: Stephen Warren swarren@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.