ARM: tegra: Add speedo-based process identification

Original-Change-Id: If6cd2914551331bd49b128ad3143a0d7adf0f120
Reviewed-on: http://git-master/r/13396
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>

Rebase-Id: Re61c7e38519e6fde84f95f1c7ecb883c92b2d0db

1 files changed, 140 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/tegra2_speedo.c b/arch/arm/mach-tegra/tegra2_speedo.c
new file mode 100644
index 000000000000..1e5fa26a5c41
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra2_speedo.c
@@ -0,0 +1,140 @@
+/*
+ * arch/arm/mach-tegra/tegra2_speedo.c
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/err.h>
+
+#include <mach/iomap.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 CHIP_ID				0x804
+#define CHIP_MINOR_SHIFT		16
+#define CHIP_MINOR_MASK			(0xF <<	CHIP_MINOR_SHIFT)
+
+#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))
+
+/* Maximum speedo levels for each CPU process corner */
+static const u32 cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
+/* proc_id 0	1    2	       3		  */
+	{315, 366, 420, UINT_MAX}, /* speedo_id 0 */
+	{303, 368, 419, UINT_MAX}, /* speedo_id 1 */
+	{316, 331, 383, UINT_MAX}, /* speedo_id 2 */
+};
+
+/* Maximum speedo levels for each core process corner */
+static const u32 core_process_speedos[][PROCESS_CORNERS_NUM] = {
+/* proc_id 0	1    2	       3		  */
+	{165, 195, 224, UINT_MAX}, /* speedo_id 0 */
+	{165, 195, 224, UINT_MAX}, /* speedo_id 1 */
+	{165, 195, 224, UINT_MAX}, /* speedo_id 2 */
+};
+
+static int cpu_process_id;
+static int core_process_id;
+static int soc_speedo_id;
+
+void tegra_init_speedo_data(void)
+{
+	u32 reg, val;
+	int i, bit, rev;
+	int sku = tegra_sku_id();
+	void __iomem *apb_misc = IO_ADDRESS(TEGRA_APB_MISC_BASE);
+
+	reg = readl(apb_misc + CHIP_ID);
+	rev = (reg & CHIP_MINOR_MASK) >> CHIP_MINOR_SHIFT;
+	if (SPEEDO_ID_SELECT_0(rev))
+		soc_speedo_id = 0;
+	else if (SPEEDO_ID_SELECT_1(sku))
+		soc_speedo_id = 1;
+	else
+		soc_speedo_id = 2;
+	BUG_ON(soc_speedo_id >= ARRAY_SIZE(cpu_process_speedos));
+	BUG_ON(soc_speedo_id >= ARRAY_SIZE(core_process_speedos));
+
+	val = 0;
+	for (bit = CPU_SPEEDO_MSBIT; bit >= CPU_SPEEDO_LSBIT; bit--) {
+		reg = tegra_spare_fuse(bit) |
+			tegra_spare_fuse(bit + CPU_SPEEDO_REDUND_OFFS);
+		val = (val << 1) | (reg & 0x1);
+	}
+	val = val * SPEEDO_MULT;
+	pr_debug("%s CPU speedo level %u\n", __func__, val);
+
+	for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
+		if (val <= cpu_process_speedos[soc_speedo_id][i])
+			break;
+	}
+	cpu_process_id = i;
+
+	val = 0;
+	for (bit = CORE_SPEEDO_MSBIT; bit >= CORE_SPEEDO_LSBIT; bit--) {
+		reg = tegra_spare_fuse(bit) |
+			tegra_spare_fuse(bit + CORE_SPEEDO_REDUND_OFFS);
+		val = (val << 1) | (reg & 0x1);
+	}
+	val = val * SPEEDO_MULT;
+	pr_debug("%s Core speedo level %u\n", __func__, val);
+
+	for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
+		if (val <= core_process_speedos[soc_speedo_id][i])
+			break;
+	}
+	core_process_id = i;
+
+	pr_info("Tegra SKU: %d Rev: A%.2d CPU Process: %d Core Process: %d"
+		" Speedo ID: %d\n", sku, rev, cpu_process_id, core_process_id,
+		soc_speedo_id);
+}
+
+int tegra_cpu_process_id(void)
+{
+	return cpu_process_id;
+}
+
+int tegra_core_process_id(void)
+{
+	return core_process_id;
+}
+
+int tegra_soc_speedo_id(void)
+{
+	return soc_speedo_id;
+}