From 25cd5a391478b1e29ef7de172b3bd612159a07cc Mon Sep 17 00:00:00 2001 From: Danny Huang Date: Thu, 15 Nov 2012 15:42:33 +0800 Subject: [PATCH] ARM: tegra: Add speedo-based process identification Detect CPU and core process ID by checking speedo corner tables. This can provide a more accurate process ID. Signed-off-by: Danny Huang [swarren s/Tegra2/Tegra20/ in log print] Signed-off-by: Stephen Warren --- arch/arm/mach-tegra/Makefile | 1 + arch/arm/mach-tegra/fuse.c | 31 +++++++--- arch/arm/mach-tegra/fuse.h | 7 +++ arch/arm/mach-tegra/tegra20_speedo.c | 109 +++++++++++++++++++++++++++++++++++ 4 files changed, 140 insertions(+), 8 deletions(-) create mode 100644 arch/arm/mach-tegra/tegra20_speedo.c diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile index 9aa653b..07ed4bd 100644 --- a/arch/arm/mach-tegra/Makefile +++ b/arch/arm/mach-tegra/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle.o obj-$(CONFIG_CPU_IDLE) += sleep.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra20_clocks.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra20_clocks_data.o +obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra20_speedo.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_emc.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += sleep-t20.o obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30_clocks.o diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c index bd19c2f..9fd02c5 100644 --- a/arch/arm/mach-tegra/fuse.c +++ b/arch/arm/mach-tegra/fuse.c @@ -35,9 +35,11 @@ int tegra_sku_id; int tegra_cpu_process_id; int tegra_core_process_id; int tegra_chip_id; +int tegra_soc_speedo_id; enum tegra_revision tegra_revision; 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. @@ -91,6 +93,16 @@ static enum tegra_revision tegra_get_revision(u32 id) } } +static void tegra_get_process_id(void) +{ + u32 reg; + + 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; +} + void tegra_init_fuse(void) { u32 id; @@ -102,21 +114,24 @@ void tegra_init_fuse(void) reg = tegra_fuse_readl(FUSE_SKU_INFO); tegra_sku_id = reg & 0xFF; - tegra_fuse_spare_bit = TEGRA20_FUSE_SPARE_BIT; - - 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; - reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT); tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT; id = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804); tegra_chip_id = (id >> 8) & 0xff; + tegra_fuse_spare_bit = TEGRA20_FUSE_SPARE_BIT; + + switch (tegra_chip_id) { + case TEGRA20: + tegra_init_speedo_data = &tegra20_init_speedo_data; + break; + default: + tegra_init_speedo_data = &tegra_get_process_id; + } + tegra_revision = tegra_get_revision(id); + tegra_init_speedo_data(); pr_info("Tegra Revision: %s SKU: %d CPU Process: %d Core Process: %d\n", tegra_revision_name[tegra_revision], diff --git a/arch/arm/mach-tegra/fuse.h b/arch/arm/mach-tegra/fuse.h index aef1223..7347c88 100644 --- a/arch/arm/mach-tegra/fuse.h +++ b/arch/arm/mach-tegra/fuse.h @@ -42,6 +42,7 @@ extern int tegra_sku_id; extern int tegra_cpu_process_id; extern int tegra_core_process_id; extern int tegra_chip_id; +extern int tegra_soc_speedo_id; extern enum tegra_revision tegra_revision; extern int tegra_bct_strapping; @@ -51,4 +52,10 @@ void tegra_init_fuse(void); bool tegra_spare_fuse(int bit); u32 tegra_fuse_readl(unsigned long offset); +#ifdef CONFIG_ARCH_TEGRA_2x_SOC +void tegra20_init_speedo_data(void); +#else +static inline void tegra20_init_speedo_data(void) {} +#endif + #endif diff --git a/arch/arm/mach-tegra/tegra20_speedo.c b/arch/arm/mach-tegra/tegra20_speedo.c new file mode 100644 index 0000000..fa6eb57 --- /dev/null +++ b/arch/arm/mach-tegra/tegra20_speedo.c @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include + +#include "fuse.h" + +#define CPU_SPEEDO_LSBIT 20 +#define CPU_SPEEDO_MSBIT 29 +#define CPU_SPEEDO_REDUND_LSBIT 30 +#define CPU_SPEEDO_REDUND_MSBIT 39 +#define CPU_SPEEDO_REDUND_OFFS (CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT) + +#define CORE_SPEEDO_LSBIT 40 +#define CORE_SPEEDO_MSBIT 47 +#define CORE_SPEEDO_REDUND_LSBIT 48 +#define CORE_SPEEDO_REDUND_MSBIT 55 +#define CORE_SPEEDO_REDUND_OFFS (CORE_SPEEDO_REDUND_MSBIT - CORE_SPEEDO_MSBIT) + +#define SPEEDO_MULT 4 + +#define PROCESS_CORNERS_NUM 4 + +#define SPEEDO_ID_SELECT_0(rev) ((rev) <= 2) +#define SPEEDO_ID_SELECT_1(sku) \ + (((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \ + ((sku) != 27) && ((sku) != 28)) + +enum { + SPEEDO_ID_0, + SPEEDO_ID_1, + SPEEDO_ID_2, + SPEEDO_ID_COUNT, +}; + +static const u32 cpu_process_speedos[][PROCESS_CORNERS_NUM] = { + {315, 366, 420, UINT_MAX}, + {303, 368, 419, UINT_MAX}, + {316, 331, 383, UINT_MAX}, +}; + +static const u32 core_process_speedos[][PROCESS_CORNERS_NUM] = { + {165, 195, 224, UINT_MAX}, + {165, 195, 224, UINT_MAX}, + {165, 195, 224, UINT_MAX}, +}; + +void tegra20_init_speedo_data(void) +{ + u32 reg; + u32 val; + int i; + + BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT); + BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) != SPEEDO_ID_COUNT); + + if (SPEEDO_ID_SELECT_0(tegra_revision)) + tegra_soc_speedo_id = SPEEDO_ID_0; + else if (SPEEDO_ID_SELECT_1(tegra_sku_id)) + tegra_soc_speedo_id = SPEEDO_ID_1; + else + tegra_soc_speedo_id = SPEEDO_ID_2; + + val = 0; + for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) { + reg = tegra_spare_fuse(i) | + tegra_spare_fuse(i + CPU_SPEEDO_REDUND_OFFS); + val = (val << 1) | (reg & 0x1); + } + val = val * SPEEDO_MULT; + pr_debug("%s CPU speedo value %u\n", __func__, val); + + for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) { + if (val <= cpu_process_speedos[tegra_soc_speedo_id][i]) + break; + } + tegra_cpu_process_id = i; + + val = 0; + for (i = CORE_SPEEDO_MSBIT; i >= CORE_SPEEDO_LSBIT; i--) { + reg = tegra_spare_fuse(i) | + tegra_spare_fuse(i + CORE_SPEEDO_REDUND_OFFS); + val = (val << 1) | (reg & 0x1); + } + val = val * SPEEDO_MULT; + pr_debug("%s Core speedo value %u\n", __func__, val); + + for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) { + if (val <= core_process_speedos[tegra_soc_speedo_id][i]) + break; + } + tegra_core_process_id = i; + + pr_info("Tegra20 Soc Speedo ID %d", tegra_soc_speedo_id); +} -- 2.7.4