diff options
Diffstat (limited to 'arch/arm/mach-tegra/fuse.c')
| -rw-r--r-- | arch/arm/mach-tegra/fuse.c | 171 |
1 files changed, 146 insertions, 25 deletions
diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c index 0b7db174a5d..c9ac23b385b 100644 --- a/arch/arm/mach-tegra/fuse.c +++ b/arch/arm/mach-tegra/fuse.c @@ -2,6 +2,7 @@ * arch/arm/mach-tegra/fuse.c * * Copyright (C) 2010 Google, Inc. + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. * * Author: * Colin Cross <ccross@android.com> @@ -20,23 +21,44 @@ #include <linux/kernel.h> #include <linux/io.h> #include <linux/export.h> - -#include <mach/iomap.h> +#include <linux/random.h> +#include <linux/clk.h> +#include <linux/tegra-soc.h> #include "fuse.h" +#include "iomap.h" #include "apbio.h" +/* Tegra20 only */ #define FUSE_UID_LOW 0x108 #define FUSE_UID_HIGH 0x10c + +/* Tegra30 and later */ +#define FUSE_VENDOR_CODE 0x200 +#define FUSE_FAB_CODE 0x204 +#define FUSE_LOT_CODE_0 0x208 +#define FUSE_LOT_CODE_1 0x20c +#define FUSE_WAFER_ID 0x210 +#define FUSE_X_COORDINATE 0x214 +#define FUSE_Y_COORDINATE 0x218 + #define FUSE_SKU_INFO 0x110 -#define FUSE_SPARE_BIT 0x200 + +#define TEGRA20_FUSE_SPARE_BIT 0x200 +#define TEGRA30_FUSE_SPARE_BIT 0x244 int tegra_sku_id; int tegra_cpu_process_id; int tegra_core_process_id; int tegra_chip_id; +int tegra_cpu_speedo_id; /* only exist in Tegra30 and later */ +int tegra_soc_speedo_id; enum tegra_revision tegra_revision; +static struct clk *fuse_clk; +static int tegra_fuse_spare_bit; +static void (*tegra_init_speedo_data)(void); + /* The BCT to use at boot is specified by board straps that can be read * through a APB misc register and decoded. 2 bits, i.e. 4 possible BCTs. */ @@ -57,14 +79,38 @@ static const char *tegra_revision_name[TEGRA_REVISION_MAX] = { [TEGRA_REVISION_A04] = "A04", }; -static inline u32 tegra_fuse_readl(unsigned long offset) +static void tegra_fuse_enable_clk(void) +{ + if (IS_ERR(fuse_clk)) + fuse_clk = clk_get_sys(NULL, "fuse"); + if (IS_ERR(fuse_clk)) + return; + clk_prepare_enable(fuse_clk); +} + +static void tegra_fuse_disable_clk(void) +{ + if (IS_ERR(fuse_clk)) + return; + clk_disable_unprepare(fuse_clk); +} + +u32 tegra_fuse_readl(unsigned long offset) { return tegra_apb_readl(TEGRA_FUSE_BASE + offset); } -static inline bool get_spare_fuse(int bit) +bool tegra_spare_fuse(int bit) { - return tegra_fuse_readl(FUSE_SPARE_BIT + bit * 4); + bool ret; + + tegra_fuse_enable_clk(); + + ret = tegra_fuse_readl(tegra_fuse_spare_bit + bit * 4); + + tegra_fuse_disable_clk(); + + return ret; } static enum tegra_revision tegra_get_revision(u32 id) @@ -78,7 +124,7 @@ static enum tegra_revision tegra_get_revision(u32 id) return TEGRA_REVISION_A02; case 3: if (tegra_chip_id == TEGRA20 && - (get_spare_fuse(18) || get_spare_fuse(19))) + (tegra_spare_fuse(18) || tegra_spare_fuse(19))) return TEGRA_REVISION_A03p; else return TEGRA_REVISION_A03; @@ -89,43 +135,118 @@ static enum tegra_revision tegra_get_revision(u32 id) } } -void tegra_init_fuse(void) +static void tegra_get_process_id(void) +{ + u32 reg; + + tegra_fuse_enable_clk(); + + reg = tegra_fuse_readl(tegra_fuse_spare_bit); + tegra_cpu_process_id = (reg >> 6) & 3; + reg = tegra_fuse_readl(tegra_fuse_spare_bit); + tegra_core_process_id = (reg >> 12) & 3; + + tegra_fuse_disable_clk(); +} + +u32 tegra_read_chipid(void) +{ + return readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804); +} + +static void __init tegra20_fuse_init_randomness(void) +{ + u32 randomness[2]; + + randomness[0] = tegra_fuse_readl(FUSE_UID_LOW); + randomness[1] = tegra_fuse_readl(FUSE_UID_HIGH); + + add_device_randomness(randomness, sizeof(randomness)); +} + +/* Applies to Tegra30 or later */ +static void __init tegra30_fuse_init_randomness(void) +{ + u32 randomness[7]; + + randomness[0] = tegra_fuse_readl(FUSE_VENDOR_CODE); + randomness[1] = tegra_fuse_readl(FUSE_FAB_CODE); + randomness[2] = tegra_fuse_readl(FUSE_LOT_CODE_0); + randomness[3] = tegra_fuse_readl(FUSE_LOT_CODE_1); + randomness[4] = tegra_fuse_readl(FUSE_WAFER_ID); + randomness[5] = tegra_fuse_readl(FUSE_X_COORDINATE); + randomness[6] = tegra_fuse_readl(FUSE_Y_COORDINATE); + + add_device_randomness(randomness, sizeof(randomness)); +} + +void __init tegra_init_fuse(void) { u32 id; + u32 randomness[5]; u32 reg = readl(IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x48)); reg |= 1 << 28; writel(reg, IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x48)); + /* + * Enable FUSE clock. This needs to be hardcoded because the clock + * subsystem is not active during early boot. + */ + reg = readl(IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x14)); + reg |= 1 << 7; + writel(reg, IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x14)); + fuse_clk = ERR_PTR(-EINVAL); + reg = tegra_fuse_readl(FUSE_SKU_INFO); + randomness[0] = reg; tegra_sku_id = reg & 0xFF; - reg = tegra_fuse_readl(FUSE_SPARE_BIT); - tegra_cpu_process_id = (reg >> 6) & 3; - - reg = tegra_fuse_readl(FUSE_SPARE_BIT); - tegra_core_process_id = (reg >> 12) & 3; - reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT); + randomness[1] = reg; tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT; - id = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804); + id = tegra_read_chipid(); + randomness[2] = id; tegra_chip_id = (id >> 8) & 0xff; + switch (tegra_chip_id) { + case TEGRA20: + tegra_fuse_spare_bit = TEGRA20_FUSE_SPARE_BIT; + tegra_init_speedo_data = &tegra20_init_speedo_data; + break; + case TEGRA30: + tegra_fuse_spare_bit = TEGRA30_FUSE_SPARE_BIT; + tegra_init_speedo_data = &tegra30_init_speedo_data; + break; + case TEGRA114: + tegra_init_speedo_data = &tegra114_init_speedo_data; + break; + default: + pr_warn("Tegra: unknown chip id %d\n", tegra_chip_id); + tegra_fuse_spare_bit = TEGRA20_FUSE_SPARE_BIT; + tegra_init_speedo_data = &tegra_get_process_id; + } + tegra_revision = tegra_get_revision(id); + tegra_init_speedo_data(); + randomness[3] = (tegra_cpu_process_id << 16) | tegra_core_process_id; + randomness[4] = (tegra_cpu_speedo_id << 16) | tegra_soc_speedo_id; + + add_device_randomness(randomness, sizeof(randomness)); + switch (tegra_chip_id) { + case TEGRA20: + tegra20_fuse_init_randomness(); + break; + case TEGRA30: + case TEGRA114: + default: + tegra30_fuse_init_randomness(); + break; + } pr_info("Tegra Revision: %s SKU: %d CPU Process: %d Core Process: %d\n", tegra_revision_name[tegra_revision], tegra_sku_id, tegra_cpu_process_id, tegra_core_process_id); } - -unsigned long long tegra_chip_uid(void) -{ - unsigned long long lo, hi; - - lo = tegra_fuse_readl(FUSE_UID_LOW); - hi = tegra_fuse_readl(FUSE_UID_HIGH); - return (hi << 32ull) | lo; -} -EXPORT_SYMBOL(tegra_chip_uid); |