ARM: tegra: add speedo-based process id for Tegra114

Add speedo-based process identification for Tegra114.

Based on the work by: Alex Frid <afrid@nvidia.com>

Signed-off-by: Danny Huang <dahuang@nvidia.com>
[swarren: added include of bug.h]
Signed-off-by: Stephen Warren <swarren@nvidia.com>

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 92703f955a373831cf92d796240ee998a4f0fadf..e40326d0e29fa8fb6dff8e694f8539ca09e8e31f 100644 (file)
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_HOTPLUG_CPU)               += hotplug.o
 obj-$(CONFIG_CPU_FREQ)                  += cpu-tegra.o
 obj-$(CONFIG_TEGRA_PCI)                        += pcie.o
 
+obj-$(CONFIG_ARCH_TEGRA_114_SOC)       += tegra114_speedo.o
 ifeq ($(CONFIG_CPU_IDLE),y)
 obj-$(CONFIG_ARCH_TEGRA_114_SOC)       += cpuidle-tegra114.o
 endif

diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index f7db0782a6b6bdbcc256a06936831ee0d38f49e7..e035cd284a6eb5e3bf1268acb00da3c5784e5ced 100644 (file)
--- 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>
@@ -137,6 +138,9 @@ void tegra_init_fuse(void)
                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;

diff --git a/arch/arm/mach-tegra/fuse.h b/arch/arm/mach-tegra/fuse.h
index da78434678c76029707c6df2d4f2b51a2f31a0bd..aacc00d059801bbfef78faa9251c276f9e4bf8da 100644 (file)
--- a/arch/arm/mach-tegra/fuse.h
+++ b/arch/arm/mach-tegra/fuse.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
  *
  * Author:
  *     Colin Cross <ccross@android.com>
@@ -66,4 +67,10 @@ void tegra30_init_speedo_data(void);
 static inline void tegra30_init_speedo_data(void) {}
 #endif
 
+#ifdef CONFIG_ARCH_TEGRA_114_SOC
+void tegra114_init_speedo_data(void);
+#else
+static inline void tegra114_init_speedo_data(void) {}
+#endif
+
 #endif

diff --git a/arch/arm/mach-tegra/tegra114_speedo.c b/arch/arm/mach-tegra/tegra114_speedo.c
new file mode 100644 (file)
index 0000000..5218d48
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra114_speedo.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2013, 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 CORE_PROCESS_CORNERS_NUM       2
+#define CPU_PROCESS_CORNERS_NUM                2
+
+enum {
+       THRESHOLD_INDEX_0,
+       THRESHOLD_INDEX_1,
+       THRESHOLD_INDEX_COUNT,
+};
+
+static const u32 core_process_speedos[][CORE_PROCESS_CORNERS_NUM] = {
+       {1123,     UINT_MAX},
+       {0,        UINT_MAX},
+};
+
+static const u32 cpu_process_speedos[][CPU_PROCESS_CORNERS_NUM] = {
+       {1695,     UINT_MAX},
+       {0,        UINT_MAX},
+};
+
+static void rev_sku_to_speedo_ids(int rev, int sku, int *threshold)
+{
+       u32 tmp;
+
+       switch (sku) {
+       case 0x00:
+       case 0x10:
+       case 0x05:
+       case 0x06:
+               tegra_cpu_speedo_id = 1;
+               tegra_soc_speedo_id = 0;
+               *threshold = THRESHOLD_INDEX_0;
+               break;
+
+       case 0x03:
+       case 0x04:
+               tegra_cpu_speedo_id = 2;
+               tegra_soc_speedo_id = 1;
+               *threshold = THRESHOLD_INDEX_1;
+               break;
+
+       default:
+               pr_err("Tegra114 Unknown SKU %d\n", sku);
+               tegra_cpu_speedo_id = 0;
+               tegra_soc_speedo_id = 0;
+               *threshold = THRESHOLD_INDEX_0;
+               break;
+       }
+
+       if (rev == TEGRA_REVISION_A01) {
+               tmp = tegra_fuse_readl(0x270) << 1;
+               tmp |= tegra_fuse_readl(0x26c);
+               if (!tmp)
+                       tegra_cpu_speedo_id = 0;
+       }
+}
+
+void tegra114_init_speedo_data(void)
+{
+       u32 cpu_speedo_val;
+       u32 core_speedo_val;
+       int threshold;
+       int i;
+
+       BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) !=
+                       THRESHOLD_INDEX_COUNT);
+       BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) !=
+                       THRESHOLD_INDEX_COUNT);
+
+       rev_sku_to_speedo_ids(tegra_revision, tegra_sku_id, &threshold);
+
+       cpu_speedo_val = tegra_fuse_readl(0x12c) + 1024;
+       core_speedo_val = tegra_fuse_readl(0x134);
+
+       for (i = 0; i < CPU_PROCESS_CORNERS_NUM; i++)
+               if (cpu_speedo_val < cpu_process_speedos[threshold][i])
+                       break;
+       tegra_cpu_process_id = i;
+
+       for (i = 0; i < CORE_PROCESS_CORNERS_NUM; i++)
+               if (core_speedo_val < core_process_speedos[threshold][i])
+                       break;
+       tegra_core_process_id = i;
+}