Initial import

1 files changed, 336 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c
new file mode 100644
index 000000000..cba8cada8
--- /dev/null
+++ b/arch/arm/mach-omap2/voltage.c
@@ -0,0 +1,336 @@
+/*
+ * OMAP3/OMAP4 Voltage Management Routines
+ *
+ * Author: Thara Gopinath	<thara@ti.com>
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ * Lesly A M <x0080970@ti.com>
+ *
+ * Copyright (C) 2008, 2011 Nokia Corporation
+ * Kalle Jokiniemi
+ * Paul Walmsley
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Thara Gopinath <thara@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+
+#include "common.h"
+
+#include "prm-regbits-34xx.h"
+#include "prm-regbits-44xx.h"
+#include "prm44xx.h"
+#include "prcm44xx.h"
+#include "prminst44xx.h"
+#include "control.h"
+
+#include "voltage.h"
+#include "powerdomain.h"
+
+#include "vc.h"
+#include "vp.h"
+
+static LIST_HEAD(voltdm_list);
+
+/* Public functions */
+/**
+ * voltdm_get_voltage() - Gets the current non-auto-compensated voltage
+ * @voltdm:	pointer to the voltdm for which current voltage info is needed
+ *
+ * API to get the current non-auto-compensated voltage for a voltage domain.
+ * Returns 0 in case of error else returns the current voltage.
+ */
+unsigned long voltdm_get_voltage(struct voltagedomain *voltdm)
+{
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warn("%s: VDD specified does not exist!\n", __func__);
+		return 0;
+	}
+
+	return voltdm->nominal_volt;
+}
+
+/**
+ * voltdm_scale() - API to scale voltage of a particular voltage domain.
+ * @voltdm: pointer to the voltage domain which is to be scaled.
+ * @target_volt: The target voltage of the voltage domain
+ *
+ * This API should be called by the kernel to do the voltage scaling
+ * for a particular voltage domain during DVFS.
+ */
+int voltdm_scale(struct voltagedomain *voltdm,
+		 unsigned long target_volt)
+{
+	int ret, i;
+	unsigned long volt = 0;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warn("%s: VDD specified does not exist!\n", __func__);
+		return -EINVAL;
+	}
+
+	if (!voltdm->scale) {
+		pr_err("%s: No voltage scale API registered for vdd_%s\n",
+			__func__, voltdm->name);
+		return -ENODATA;
+	}
+
+	/* Adjust voltage to the exact voltage from the OPP table */
+	for (i = 0; voltdm->volt_data[i].volt_nominal != 0; i++) {
+		if (voltdm->volt_data[i].volt_nominal >= target_volt) {
+			volt = voltdm->volt_data[i].volt_nominal;
+			break;
+		}
+	}
+
+	if (!volt) {
+		pr_warn("%s: not scaling. OPP voltage for %lu, not found.\n",
+			__func__, target_volt);
+		return -EINVAL;
+	}
+
+	ret = voltdm->scale(voltdm, volt);
+	if (!ret)
+		voltdm->nominal_volt = volt;
+
+	return ret;
+}
+
+/**
+ * voltdm_reset() - Resets the voltage of a particular voltage domain
+ *		    to that of the current OPP.
+ * @voltdm: pointer to the voltage domain whose voltage is to be reset.
+ *
+ * This API finds out the correct voltage the voltage domain is supposed
+ * to be at and resets the voltage to that level. Should be used especially
+ * while disabling any voltage compensation modules.
+ */
+void voltdm_reset(struct voltagedomain *voltdm)
+{
+	unsigned long target_volt;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warn("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	target_volt = voltdm_get_voltage(voltdm);
+	if (!target_volt) {
+		pr_err("%s: unable to find current voltage for vdd_%s\n",
+			__func__, voltdm->name);
+		return;
+	}
+
+	voltdm_scale(voltdm, target_volt);
+}
+
+/**
+ * omap_voltage_get_volttable() - API to get the voltage table associated with a
+ *				particular voltage domain.
+ * @voltdm:	pointer to the VDD for which the voltage table is required
+ * @volt_data:	the voltage table for the particular vdd which is to be
+ *		populated by this API
+ *
+ * This API populates the voltage table associated with a VDD into the
+ * passed parameter pointer. Returns the count of distinct voltages
+ * supported by this vdd.
+ *
+ */
+void omap_voltage_get_volttable(struct voltagedomain *voltdm,
+				struct omap_volt_data **volt_data)
+{
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warn("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	*volt_data = voltdm->volt_data;
+}
+
+/**
+ * omap_voltage_get_voltdata() - API to get the voltage table entry for a
+ *				particular voltage
+ * @voltdm:	pointer to the VDD whose voltage table has to be searched
+ * @volt:	the voltage to be searched in the voltage table
+ *
+ * This API searches through the voltage table for the required voltage
+ * domain and tries to find a matching entry for the passed voltage volt.
+ * If a matching entry is found volt_data is populated with that entry.
+ * This API searches only through the non-compensated voltages int the
+ * voltage table.
+ * Returns pointer to the voltage table entry corresponding to volt on
+ * success. Returns -ENODATA if no voltage table exisits for the passed voltage
+ * domain or if there is no matching entry.
+ */
+struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
+						 unsigned long volt)
+{
+	int i;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warn("%s: VDD specified does not exist!\n", __func__);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (!voltdm->volt_data) {
+		pr_warn("%s: voltage table does not exist for vdd_%s\n",
+			__func__, voltdm->name);
+		return ERR_PTR(-ENODATA);
+	}
+
+	for (i = 0; voltdm->volt_data[i].volt_nominal != 0; i++) {
+		if (voltdm->volt_data[i].volt_nominal == volt)
+			return &voltdm->volt_data[i];
+	}
+
+	pr_notice("%s: Unable to match the current voltage with the voltage table for vdd_%s\n",
+		  __func__, voltdm->name);
+
+	return ERR_PTR(-ENODATA);
+}
+
+/**
+ * omap_voltage_register_pmic() - API to register PMIC specific data
+ * @voltdm:	pointer to the VDD for which the PMIC specific data is
+ *		to be registered
+ * @pmic:	the structure containing pmic info
+ *
+ * This API is to be called by the SOC/PMIC file to specify the
+ * pmic specific info as present in omap_voltdm_pmic structure.
+ */
+int omap_voltage_register_pmic(struct voltagedomain *voltdm,
+			       struct omap_voltdm_pmic *pmic)
+{
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warn("%s: VDD specified does not exist!\n", __func__);
+		return -EINVAL;
+	}
+
+	voltdm->pmic = pmic;
+
+	return 0;
+}
+
+/**
+ * omap_voltage_late_init() - Init the various voltage parameters
+ *
+ * This API is to be called in the later stages of the
+ * system boot to init the voltage controller and
+ * voltage processors.
+ */
+int __init omap_voltage_late_init(void)
+{
+	struct voltagedomain *voltdm;
+
+	if (list_empty(&voltdm_list)) {
+		pr_err("%s: Voltage driver support not added\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	list_for_each_entry(voltdm, &voltdm_list, node) {
+		struct clk *sys_ck;
+
+		if (!voltdm->scalable)
+			continue;
+
+		sys_ck = clk_get(NULL, voltdm->sys_clk.name);
+		if (IS_ERR(sys_ck)) {
+			pr_warn("%s: Could not get sys clk.\n", __func__);
+			return -EINVAL;
+		}
+		voltdm->sys_clk.rate = clk_get_rate(sys_ck);
+		WARN_ON(!voltdm->sys_clk.rate);
+		clk_put(sys_ck);
+
+		if (voltdm->vc) {
+			voltdm->scale = omap_vc_bypass_scale;
+			omap_vc_init_channel(voltdm);
+		}
+
+		if (voltdm->vp) {
+			voltdm->scale = omap_vp_forceupdate_scale;
+			omap_vp_init(voltdm);
+		}
+	}
+
+	return 0;
+}
+
+static struct voltagedomain *_voltdm_lookup(const char *name)
+{
+	struct voltagedomain *voltdm, *temp_voltdm;
+
+	voltdm = NULL;
+
+	list_for_each_entry(temp_voltdm, &voltdm_list, node) {
+		if (!strcmp(name, temp_voltdm->name)) {
+			voltdm = temp_voltdm;
+			break;
+		}
+	}
+
+	return voltdm;
+}
+
+static int _voltdm_register(struct voltagedomain *voltdm)
+{
+	if (!voltdm || !voltdm->name)
+		return -EINVAL;
+
+	list_add(&voltdm->node, &voltdm_list);
+
+	pr_debug("voltagedomain: registered %s\n", voltdm->name);
+
+	return 0;
+}
+
+/**
+ * voltdm_lookup - look up a voltagedomain by name, return a pointer
+ * @name: name of voltagedomain
+ *
+ * Find a registered voltagedomain by its name @name.  Returns a pointer
+ * to the struct voltagedomain if found, or NULL otherwise.
+ */
+struct voltagedomain *voltdm_lookup(const char *name)
+{
+	struct voltagedomain *voltdm ;
+
+	if (!name)
+		return NULL;
+
+	voltdm = _voltdm_lookup(name);
+
+	return voltdm;
+}
+
+/**
+ * voltdm_init - set up the voltagedomain layer
+ * @voltdm_list: array of struct voltagedomain pointers to register
+ *
+ * Loop through the array of voltagedomains @voltdm_list, registering all
+ * that are available on the current CPU. If voltdm_list is supplied
+ * and not null, all of the referenced voltagedomains will be
+ * registered.  No return value.
+ */
+void voltdm_init(struct voltagedomain **voltdms)
+{
+	struct voltagedomain **v;
+
+	if (voltdms) {
+		for (v = voltdms; *v; v++)
+			_voltdm_register(*v);
+	}
+}