ARM: tegra: cleanup use of chipid register
The chipid register contains information about the Tegra variant and revision.
We want differentiate between Tegra variants for powergating and secondary
core bringup. This patch cleans up the reading and decoding of this register.
In subsequent patches the variant will exported as a global variable.
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index 17fdd40..e2dd342 100644
--- a/arch/arm/mach-tegra/fuse.c
+++ b/arch/arm/mach-tegra/fuse.c
@@ -33,6 +33,7 @@
int tegra_sku_id;
int tegra_cpu_process_id;
int tegra_core_process_id;
+static int tegra_chip_id;
enum tegra_revision tegra_revision;
/* The BCT to use at boot is specified by board straps that can be read
@@ -65,12 +66,9 @@
return tegra_fuse_readl(FUSE_SPARE_BIT + bit * 4);
}
-static enum tegra_revision tegra_get_revision(void)
+static enum tegra_revision tegra_get_revision(u32 id)
{
- void __iomem *chip_id = IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804;
- u32 id = readl(chip_id);
u32 minor_rev = (id >> 16) & 0xf;
- u32 chipid = (id >> 8) & 0xff;
switch (minor_rev) {
case 1:
@@ -78,7 +76,8 @@
case 2:
return TEGRA_REVISION_A02;
case 3:
- if (chipid == 0x20 && (get_spare_fuse(18) || get_spare_fuse(19)))
+ if (tegra_chip_id == TEGRA20 &&
+ (get_spare_fuse(18) || get_spare_fuse(19)))
return TEGRA_REVISION_A03p;
else
return TEGRA_REVISION_A03;
@@ -91,6 +90,8 @@
void tegra_init_fuse(void)
{
+ u32 id;
+
u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
reg |= 1 << 28;
writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
@@ -107,10 +108,13 @@
reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT);
tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT;
- tegra_revision = tegra_get_revision();
+ id = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
+ tegra_chip_id = (id >> 8) & 0xff;
+
+ tegra_revision = tegra_get_revision(id);
pr_info("Tegra Revision: %s SKU: %d CPU Process: %d Core Process: %d\n",
- tegra_revision_name[tegra_get_revision()],
+ tegra_revision_name[tegra_revision],
tegra_sku_id, tegra_cpu_process_id,
tegra_core_process_id);
}