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 <dahuang@nvidia.com>
[swarren s/Tegra2/Tegra20/ in log print]
Signed-off-by: Stephen Warren <swarren@nvidia.com>

4 files changed, 140 insertions, 8 deletions

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 9aa653b3eb32..07ed4bdaba3a 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 bd19c2f53a97..9fd02c50ae29 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 aef12231e559..7347c8818937 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 000000000000..fa6eb570623f
--- /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 <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/bug.h>
+
+#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);
+}