1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/tegra20/pmu.c b/arch/arm/mach-tegra/tegra20/pmu.c
new file mode 100644
index 0000000000..a774246a27
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra20/pmu.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <tps6586x.h>
+#include <asm/io.h>
+#include <asm/arch/tegra.h>
+#include <asm/arch-tegra/ap.h>
+#include <asm/arch-tegra/tegra_i2c.h>
+#include <asm/arch-tegra/sys_proto.h>
+
+#define VDD_CORE_NOMINAL_T25	0x17	/* 1.3v */
+#define VDD_CPU_NOMINAL_T25	0x10	/* 1.125v */
+
+#define VDD_CORE_NOMINAL_T20	0x16	/* 1.275v */
+#define VDD_CPU_NOMINAL_T20	0x0f	/* 1.1v */
+
+#define VDD_RELATION		0x02	/*  50mv */
+#define VDD_TRANSITION_STEP	0x06	/* 150mv */
+#define VDD_TRANSITION_RATE	0x06	/* 3.52mv/us */
+
+#define PMI_I2C_ADDRESS	0x34	/* chip requires this address */
+
+int pmu_set_nominal(void)
+{
+	struct udevice *bus, *dev;
+	int core, cpu;
+	int ret;
+
+	/* by default, the table has been filled with T25 settings */
+	switch (tegra_get_chip_sku()) {
+	case TEGRA_SOC_T20:
+		core = VDD_CORE_NOMINAL_T20;
+		cpu = VDD_CPU_NOMINAL_T20;
+		break;
+	case TEGRA_SOC_T25:
+		core = VDD_CORE_NOMINAL_T25;
+		cpu = VDD_CPU_NOMINAL_T25;
+		break;
+	default:
+		debug("%s: Unknown SKU id\n", __func__);
+		return -1;
+	}
+
+	ret = tegra_i2c_get_dvc_bus(&bus);
+	if (ret) {
+		debug("%s: Cannot find DVC I2C bus\n", __func__);
+		return ret;
+	}
+	ret = i2c_get_chip(bus, PMI_I2C_ADDRESS, 1, &dev);
+	if (ret) {
+		debug("%s: Cannot find DVC I2C chip\n", __func__);
+		return ret;
+	}
+
+	tps6586x_init(dev);
+	tps6586x_set_pwm_mode(TPS6586X_PWM_SM1);
+	return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP,
+				VDD_TRANSITION_RATE, VDD_RELATION);
+}