soc/tegra: Add efuse driver for Tegra

Implement fuse driver for Tegra20, Tegra30, Tegra114 and Tegra124. This
replaces functionality previously provided in arch/arm/mach-tegra, which
is removed in this patch.

While at it, move the only user of the global tegra_revision variable
over to tegra_sku_info.revision and export tegra_fuse_readl() to allow
drivers to read calibration fuses.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 168 insertions, 0 deletions

diff --git a/drivers/soc/tegra/fuse/speedo-tegra124.c b/drivers/soc/tegra/fuse/speedo-tegra124.c
new file mode 100644
index 000000000000..46362387d974
--- /dev/null
+++ b/drivers/soc/tegra/fuse/speedo-tegra124.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2013-2014, 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/device.h>
+#include <linux/kernel.h>
+#include <linux/bug.h>
+
+#include <soc/tegra/fuse.h>
+
+#include "fuse.h"
+
+#define CPU_PROCESS_CORNERS	2
+#define GPU_PROCESS_CORNERS	2
+#define CORE_PROCESS_CORNERS	2
+
+#define FUSE_CPU_SPEEDO_0	0x14
+#define FUSE_CPU_SPEEDO_1	0x2c
+#define FUSE_CPU_SPEEDO_2	0x30
+#define FUSE_SOC_SPEEDO_0	0x34
+#define FUSE_SOC_SPEEDO_1	0x38
+#define FUSE_SOC_SPEEDO_2	0x3c
+#define FUSE_CPU_IDDQ		0x18
+#define FUSE_SOC_IDDQ		0x40
+#define FUSE_GPU_IDDQ		0x128
+#define FUSE_FT_REV		0x28
+
+enum {
+	THRESHOLD_INDEX_0,
+	THRESHOLD_INDEX_1,
+	THRESHOLD_INDEX_COUNT,
+};
+
+static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {
+	{2190,	UINT_MAX},
+	{0,	UINT_MAX},
+};
+
+static const u32 __initconst gpu_process_speedos[][GPU_PROCESS_CORNERS] = {
+	{1965,	UINT_MAX},
+	{0,	UINT_MAX},
+};
+
+static const u32 __initconst core_process_speedos[][CORE_PROCESS_CORNERS] = {
+	{2101,	UINT_MAX},
+	{0,	UINT_MAX},
+};
+
+static void __init rev_sku_to_speedo_ids(struct tegra_sku_info *sku_info,
+					 int *threshold)
+{
+	int sku = sku_info->sku_id;
+
+	/* Assign to default */
+	sku_info->cpu_speedo_id = 0;
+	sku_info->soc_speedo_id = 0;
+	sku_info->gpu_speedo_id = 0;
+	*threshold = THRESHOLD_INDEX_0;
+
+	switch (sku) {
+	case 0x00: /* Eng sku */
+	case 0x0F:
+	case 0x23:
+		/* Using the default */
+		break;
+	case 0x83:
+		sku_info->cpu_speedo_id = 2;
+		break;
+
+	case 0x1F:
+	case 0x87:
+	case 0x27:
+		sku_info->cpu_speedo_id = 2;
+		sku_info->soc_speedo_id = 0;
+		sku_info->gpu_speedo_id = 1;
+		*threshold = THRESHOLD_INDEX_0;
+		break;
+	case 0x81:
+	case 0x21:
+	case 0x07:
+		sku_info->cpu_speedo_id = 1;
+		sku_info->soc_speedo_id = 1;
+		sku_info->gpu_speedo_id = 1;
+		*threshold = THRESHOLD_INDEX_1;
+		break;
+	case 0x49:
+	case 0x4A:
+	case 0x48:
+		sku_info->cpu_speedo_id = 4;
+		sku_info->soc_speedo_id = 2;
+		sku_info->gpu_speedo_id = 3;
+		*threshold = THRESHOLD_INDEX_1;
+		break;
+	default:
+		pr_err("Tegra Unknown SKU %d\n", sku);
+		/* Using the default for the error case */
+		break;
+	}
+}
+
+void __init tegra124_init_speedo_data(struct tegra_sku_info *sku_info)
+{
+	int i, threshold, cpu_speedo_0_value, soc_speedo_0_value;
+	int cpu_iddq_value, gpu_iddq_value, soc_iddq_value;
+
+	BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) !=
+			THRESHOLD_INDEX_COUNT);
+	BUILD_BUG_ON(ARRAY_SIZE(gpu_process_speedos) !=
+			THRESHOLD_INDEX_COUNT);
+	BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) !=
+			THRESHOLD_INDEX_COUNT);
+
+	cpu_speedo_0_value = tegra30_fuse_readl(FUSE_CPU_SPEEDO_0);
+
+	/* GPU Speedo is stored in CPU_SPEEDO_2 */
+	sku_info->gpu_speedo_value = tegra30_fuse_readl(FUSE_CPU_SPEEDO_2);
+
+	soc_speedo_0_value = tegra30_fuse_readl(FUSE_SOC_SPEEDO_0);
+
+	cpu_iddq_value = tegra30_fuse_readl(FUSE_CPU_IDDQ);
+	soc_iddq_value = tegra30_fuse_readl(FUSE_SOC_IDDQ);
+	gpu_iddq_value = tegra30_fuse_readl(FUSE_GPU_IDDQ);
+
+	sku_info->cpu_speedo_value = cpu_speedo_0_value;
+
+	if (sku_info->cpu_speedo_value == 0) {
+		pr_warn("Tegra Warning: Speedo value not fused.\n");
+		WARN_ON(1);
+		return;
+	}
+
+	rev_sku_to_speedo_ids(sku_info, &threshold);
+
+	sku_info->cpu_iddq_value = tegra30_fuse_readl(FUSE_CPU_IDDQ);
+
+	for (i = 0; i < GPU_PROCESS_CORNERS; i++)
+		if (sku_info->gpu_speedo_value <
+			gpu_process_speedos[threshold][i])
+			break;
+	sku_info->gpu_process_id = i;
+
+	for (i = 0; i < CPU_PROCESS_CORNERS; i++)
+		if (sku_info->cpu_speedo_value <
+			cpu_process_speedos[threshold][i])
+				break;
+	sku_info->cpu_process_id = i;
+
+	for (i = 0; i < CORE_PROCESS_CORNERS; i++)
+		if (soc_speedo_0_value <
+			core_process_speedos[threshold][i])
+			break;
+	sku_info->core_process_id = i;
+
+	pr_debug("Tegra GPU Speedo ID=%d, Speedo Value=%d\n",
+		 sku_info->gpu_speedo_id, sku_info->gpu_speedo_value);
+}