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@@ -0,0 +1,591 @@
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+/*
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+ * Generic OPP OF helpers
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+ *
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+ * Copyright (C) 2009-2010 Texas Instruments Incorporated.
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+ * Nishanth Menon
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+ * Romit Dasgupta
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+ * Kevin Hilman
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+#include <linux/cpu.h>
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+#include <linux/errno.h>
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+#include <linux/device.h>
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+#include <linux/of.h>
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+#include <linux/export.h>
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+
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+#include "opp.h"
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+
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+static struct opp_table *_managed_opp(const struct device_node *np)
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+{
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+ struct opp_table *opp_table;
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+
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+ list_for_each_entry_rcu(opp_table, &opp_tables, node) {
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+ if (opp_table->np == np) {
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+ /*
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+ * Multiple devices can point to the same OPP table and
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+ * so will have same node-pointer, np.
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+ *
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+ * But the OPPs will be considered as shared only if the
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+ * OPP table contains a "opp-shared" property.
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+ */
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+ return opp_table->shared_opp ? opp_table : NULL;
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+ }
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+ }
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+
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+ return NULL;
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+}
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+
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+void _of_init_opp_table(struct opp_table *opp_table, struct device *dev)
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+{
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+ struct device_node *np;
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+
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+ /*
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+ * Only required for backward compatibility with v1 bindings, but isn't
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+ * harmful for other cases. And so we do it unconditionally.
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+ */
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+ np = of_node_get(dev->of_node);
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+ if (np) {
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+ u32 val;
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+
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+ if (!of_property_read_u32(np, "clock-latency", &val))
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+ opp_table->clock_latency_ns_max = val;
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+ of_property_read_u32(np, "voltage-tolerance",
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+ &opp_table->voltage_tolerance_v1);
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+ of_node_put(np);
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+ }
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+}
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+
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+static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
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+ struct device_node *np)
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+{
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+ unsigned int count = opp_table->supported_hw_count;
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+ u32 version;
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+ int ret;
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+
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+ if (!opp_table->supported_hw)
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+ return true;
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+
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+ while (count--) {
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+ ret = of_property_read_u32_index(np, "opp-supported-hw", count,
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+ &version);
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+ if (ret) {
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+ dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
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+ __func__, count, ret);
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+ return false;
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+ }
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+
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+ /* Both of these are bitwise masks of the versions */
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+ if (!(version & opp_table->supported_hw[count]))
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+ return false;
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+ }
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+
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+ return true;
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+}
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+
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+/* TODO: Support multiple regulators */
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+static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
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+ struct opp_table *opp_table)
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+{
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+ u32 microvolt[3] = {0};
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+ u32 val;
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+ int count, ret;
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+ struct property *prop = NULL;
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+ char name[NAME_MAX];
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+
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+ /* Search for "opp-microvolt-<name>" */
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+ if (opp_table->prop_name) {
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+ snprintf(name, sizeof(name), "opp-microvolt-%s",
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+ opp_table->prop_name);
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+ prop = of_find_property(opp->np, name, NULL);
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+ }
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+
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+ if (!prop) {
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+ /* Search for "opp-microvolt" */
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+ sprintf(name, "opp-microvolt");
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+ prop = of_find_property(opp->np, name, NULL);
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+
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+ /* Missing property isn't a problem, but an invalid entry is */
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+ if (!prop)
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+ return 0;
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+ }
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+
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+ count = of_property_count_u32_elems(opp->np, name);
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+ if (count < 0) {
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+ dev_err(dev, "%s: Invalid %s property (%d)\n",
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+ __func__, name, count);
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+ return count;
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+ }
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+
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+ /* There can be one or three elements here */
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+ if (count != 1 && count != 3) {
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+ dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n",
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+ __func__, name, count);
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+ return -EINVAL;
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+ }
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+
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+ ret = of_property_read_u32_array(opp->np, name, microvolt, count);
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+ if (ret) {
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+ dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
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+ return -EINVAL;
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+ }
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+
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+ opp->u_volt = microvolt[0];
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+
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+ if (count == 1) {
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+ opp->u_volt_min = opp->u_volt;
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+ opp->u_volt_max = opp->u_volt;
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+ } else {
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+ opp->u_volt_min = microvolt[1];
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+ opp->u_volt_max = microvolt[2];
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+ }
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+
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+ /* Search for "opp-microamp-<name>" */
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+ prop = NULL;
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+ if (opp_table->prop_name) {
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+ snprintf(name, sizeof(name), "opp-microamp-%s",
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+ opp_table->prop_name);
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+ prop = of_find_property(opp->np, name, NULL);
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+ }
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+
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+ if (!prop) {
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+ /* Search for "opp-microamp" */
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+ sprintf(name, "opp-microamp");
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+ prop = of_find_property(opp->np, name, NULL);
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+ }
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+
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+ if (prop && !of_property_read_u32(opp->np, name, &val))
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+ opp->u_amp = val;
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+
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+ return 0;
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+}
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+
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+/**
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+ * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
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+ * entries
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+ * @dev: device pointer used to lookup OPP table.
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+ *
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+ * Free OPPs created using static entries present in DT.
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+ *
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+ * Locking: The internal opp_table and opp structures are RCU protected.
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+ * Hence this function indirectly uses RCU updater strategy with mutex locks
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+ * to keep the integrity of the internal data structures. Callers should ensure
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+ * that this function is *NOT* called under RCU protection or in contexts where
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+ * mutex cannot be locked.
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+ */
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+void dev_pm_opp_of_remove_table(struct device *dev)
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+{
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+ _dev_pm_opp_remove_table(dev, false);
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+}
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+EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
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+
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+/* Returns opp descriptor node for a device, caller must do of_node_put() */
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+struct device_node *_of_get_opp_desc_node(struct device *dev)
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+{
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+ /*
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+ * TODO: Support for multiple OPP tables.
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+ *
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+ * There should be only ONE phandle present in "operating-points-v2"
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+ * property.
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+ */
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+
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+ return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
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+}
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+
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+/**
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+ * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
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+ * @dev: device for which we do this operation
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+ * @np: device node
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+ *
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+ * This function adds an opp definition to the opp table and returns status. The
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+ * opp can be controlled using dev_pm_opp_enable/disable functions and may be
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+ * removed by dev_pm_opp_remove.
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+ *
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+ * Locking: The internal opp_table and opp structures are RCU protected.
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+ * Hence this function internally uses RCU updater strategy with mutex locks
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+ * to keep the integrity of the internal data structures. Callers should ensure
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+ * that this function is *NOT* called under RCU protection or in contexts where
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+ * mutex cannot be locked.
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+ *
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+ * Return:
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+ * 0 On success OR
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+ * Duplicate OPPs (both freq and volt are same) and opp->available
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+ * -EEXIST Freq are same and volt are different OR
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+ * Duplicate OPPs (both freq and volt are same) and !opp->available
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+ * -ENOMEM Memory allocation failure
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+ * -EINVAL Failed parsing the OPP node
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+ */
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+static int _opp_add_static_v2(struct device *dev, struct device_node *np)
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+{
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+ struct opp_table *opp_table;
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+ struct dev_pm_opp *new_opp;
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+ u64 rate;
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+ u32 val;
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+ int ret;
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+
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+ /* Hold our table modification lock here */
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+ mutex_lock(&opp_table_lock);
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+
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+ new_opp = _allocate_opp(dev, &opp_table);
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+ if (!new_opp) {
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+ ret = -ENOMEM;
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+ goto unlock;
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+ }
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+
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+ ret = of_property_read_u64(np, "opp-hz", &rate);
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+ if (ret < 0) {
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+ dev_err(dev, "%s: opp-hz not found\n", __func__);
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+ goto free_opp;
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+ }
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+
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+ /* Check if the OPP supports hardware's hierarchy of versions or not */
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+ if (!_opp_is_supported(dev, opp_table, np)) {
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+ dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
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+ goto free_opp;
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+ }
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+
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+ /*
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+ * Rate is defined as an unsigned long in clk API, and so casting
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+ * explicitly to its type. Must be fixed once rate is 64 bit
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+ * guaranteed in clk API.
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+ */
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+ new_opp->rate = (unsigned long)rate;
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+ new_opp->turbo = of_property_read_bool(np, "turbo-mode");
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+
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+ new_opp->np = np;
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+ new_opp->dynamic = false;
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+ new_opp->available = true;
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+
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+ if (!of_property_read_u32(np, "clock-latency-ns", &val))
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+ new_opp->clock_latency_ns = val;
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+
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+ ret = opp_parse_supplies(new_opp, dev, opp_table);
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+ if (ret)
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+ goto free_opp;
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+
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+ ret = _opp_add(dev, new_opp, opp_table);
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+ if (ret)
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+ goto free_opp;
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+
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+ /* OPP to select on device suspend */
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+ if (of_property_read_bool(np, "opp-suspend")) {
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+ if (opp_table->suspend_opp) {
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+ dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
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+ __func__, opp_table->suspend_opp->rate,
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+ new_opp->rate);
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+ } else {
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+ new_opp->suspend = true;
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+ opp_table->suspend_opp = new_opp;
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+ }
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+ }
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+
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+ if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
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+ opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
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+
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+ mutex_unlock(&opp_table_lock);
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+
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+ pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
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+ __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
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+ new_opp->u_volt_min, new_opp->u_volt_max,
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+ new_opp->clock_latency_ns);
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+
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+ /*
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+ * Notify the changes in the availability of the operable
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+ * frequency/voltage list.
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+ */
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+ srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
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+ return 0;
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+
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+free_opp:
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+ _opp_remove(opp_table, new_opp, false);
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+unlock:
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+ mutex_unlock(&opp_table_lock);
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+ return ret;
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+}
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+
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+/* Initializes OPP tables based on new bindings */
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+static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
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+{
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+ struct device_node *np;
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+ struct opp_table *opp_table;
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+ int ret = 0, count = 0;
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+
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+ mutex_lock(&opp_table_lock);
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+
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+ opp_table = _managed_opp(opp_np);
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+ if (opp_table) {
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+ /* OPPs are already managed */
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+ if (!_add_opp_dev(dev, opp_table))
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+ ret = -ENOMEM;
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+ mutex_unlock(&opp_table_lock);
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+ return ret;
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+ }
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+ mutex_unlock(&opp_table_lock);
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+
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+ /* We have opp-table node now, iterate over it and add OPPs */
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+ for_each_available_child_of_node(opp_np, np) {
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+ count++;
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+
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+ ret = _opp_add_static_v2(dev, np);
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+ if (ret) {
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+ dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
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+ ret);
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+ goto free_table;
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+ }
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+ }
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+
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+ /* There should be one of more OPP defined */
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+ if (WARN_ON(!count))
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+ return -ENOENT;
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+
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+ mutex_lock(&opp_table_lock);
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+
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+ opp_table = _find_opp_table(dev);
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+ if (WARN_ON(IS_ERR(opp_table))) {
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+ ret = PTR_ERR(opp_table);
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+ mutex_unlock(&opp_table_lock);
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+ goto free_table;
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+ }
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+
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+ opp_table->np = opp_np;
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+ opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared");
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+
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+ mutex_unlock(&opp_table_lock);
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+
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+ return 0;
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+
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+free_table:
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+ dev_pm_opp_of_remove_table(dev);
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+
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+ return ret;
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+}
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+
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+/* Initializes OPP tables based on old-deprecated bindings */
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+static int _of_add_opp_table_v1(struct device *dev)
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+{
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+ const struct property *prop;
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+ const __be32 *val;
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+ int nr;
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+
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+ prop = of_find_property(dev->of_node, "operating-points", NULL);
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+ if (!prop)
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+ return -ENODEV;
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+ if (!prop->value)
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+ return -ENODATA;
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+
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+ /*
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+ * Each OPP is a set of tuples consisting of frequency and
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+ * voltage like <freq-kHz vol-uV>.
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+ */
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+ nr = prop->length / sizeof(u32);
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+ if (nr % 2) {
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+ dev_err(dev, "%s: Invalid OPP table\n", __func__);
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+ return -EINVAL;
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+ }
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+
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+ val = prop->value;
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+ while (nr) {
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+ unsigned long freq = be32_to_cpup(val++) * 1000;
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+ unsigned long volt = be32_to_cpup(val++);
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+
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+ if (_opp_add_v1(dev, freq, volt, false))
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+ dev_warn(dev, "%s: Failed to add OPP %ld\n",
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+ __func__, freq);
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+ nr -= 2;
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+ }
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+
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+ return 0;
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+}
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+
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+/**
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+ * dev_pm_opp_of_add_table() - Initialize opp table from device tree
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+ * @dev: device pointer used to lookup OPP table.
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+ *
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+ * Register the initial OPP table with the OPP library for given device.
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+ *
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+ * Locking: The internal opp_table and opp structures are RCU protected.
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|
|
+ * Hence this function indirectly uses RCU updater strategy with mutex locks
|
|
|
+ * to keep the integrity of the internal data structures. Callers should ensure
|
|
|
+ * that this function is *NOT* called under RCU protection or in contexts where
|
|
|
+ * mutex cannot be locked.
|
|
|
+ *
|
|
|
+ * Return:
|
|
|
+ * 0 On success OR
|
|
|
+ * Duplicate OPPs (both freq and volt are same) and opp->available
|
|
|
+ * -EEXIST Freq are same and volt are different OR
|
|
|
+ * Duplicate OPPs (both freq and volt are same) and !opp->available
|
|
|
+ * -ENOMEM Memory allocation failure
|
|
|
+ * -ENODEV when 'operating-points' property is not found or is invalid data
|
|
|
+ * in device node.
|
|
|
+ * -ENODATA when empty 'operating-points' property is found
|
|
|
+ * -EINVAL when invalid entries are found in opp-v2 table
|
|
|
+ */
|
|
|
+int dev_pm_opp_of_add_table(struct device *dev)
|
|
|
+{
|
|
|
+ struct device_node *opp_np;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * OPPs have two version of bindings now. The older one is deprecated,
|
|
|
+ * try for the new binding first.
|
|
|
+ */
|
|
|
+ opp_np = _of_get_opp_desc_node(dev);
|
|
|
+ if (!opp_np) {
|
|
|
+ /*
|
|
|
+ * Try old-deprecated bindings for backward compatibility with
|
|
|
+ * older dtbs.
|
|
|
+ */
|
|
|
+ return _of_add_opp_table_v1(dev);
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = _of_add_opp_table_v2(dev, opp_np);
|
|
|
+ of_node_put(opp_np);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
|
|
|
+
|
|
|
+/* CPU device specific helpers */
|
|
|
+
|
|
|
+/**
|
|
|
+ * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask
|
|
|
+ * @cpumask: cpumask for which OPP table needs to be removed
|
|
|
+ *
|
|
|
+ * This removes the OPP tables for CPUs present in the @cpumask.
|
|
|
+ * This should be used only to remove static entries created from DT.
|
|
|
+ *
|
|
|
+ * Locking: The internal opp_table and opp structures are RCU protected.
|
|
|
+ * Hence this function internally uses RCU updater strategy with mutex locks
|
|
|
+ * to keep the integrity of the internal data structures. Callers should ensure
|
|
|
+ * that this function is *NOT* called under RCU protection or in contexts where
|
|
|
+ * mutex cannot be locked.
|
|
|
+ */
|
|
|
+void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
|
|
|
+{
|
|
|
+ _dev_pm_opp_cpumask_remove_table(cpumask, true);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
|
|
|
+
|
|
|
+/**
|
|
|
+ * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask
|
|
|
+ * @cpumask: cpumask for which OPP table needs to be added.
|
|
|
+ *
|
|
|
+ * This adds the OPP tables for CPUs present in the @cpumask.
|
|
|
+ *
|
|
|
+ * Locking: The internal opp_table and opp structures are RCU protected.
|
|
|
+ * Hence this function internally uses RCU updater strategy with mutex locks
|
|
|
+ * to keep the integrity of the internal data structures. Callers should ensure
|
|
|
+ * that this function is *NOT* called under RCU protection or in contexts where
|
|
|
+ * mutex cannot be locked.
|
|
|
+ */
|
|
|
+int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
|
|
|
+{
|
|
|
+ struct device *cpu_dev;
|
|
|
+ int cpu, ret = 0;
|
|
|
+
|
|
|
+ WARN_ON(cpumask_empty(cpumask));
|
|
|
+
|
|
|
+ for_each_cpu(cpu, cpumask) {
|
|
|
+ cpu_dev = get_cpu_device(cpu);
|
|
|
+ if (!cpu_dev) {
|
|
|
+ pr_err("%s: failed to get cpu%d device\n", __func__,
|
|
|
+ cpu);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = dev_pm_opp_of_add_table(cpu_dev);
|
|
|
+ if (ret) {
|
|
|
+ pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
|
|
|
+ __func__, cpu, ret);
|
|
|
+
|
|
|
+ /* Free all other OPPs */
|
|
|
+ dev_pm_opp_of_cpumask_remove_table(cpumask);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
|
|
|
+
|
|
|
+/*
|
|
|
+ * Works only for OPP v2 bindings.
|
|
|
+ *
|
|
|
+ * Returns -ENOENT if operating-points-v2 bindings aren't supported.
|
|
|
+ */
|
|
|
+/**
|
|
|
+ * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with
|
|
|
+ * @cpu_dev using operating-points-v2
|
|
|
+ * bindings.
|
|
|
+ *
|
|
|
+ * @cpu_dev: CPU device for which we do this operation
|
|
|
+ * @cpumask: cpumask to update with information of sharing CPUs
|
|
|
+ *
|
|
|
+ * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
|
|
|
+ *
|
|
|
+ * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
|
|
|
+ *
|
|
|
+ * Locking: The internal opp_table and opp structures are RCU protected.
|
|
|
+ * Hence this function internally uses RCU updater strategy with mutex locks
|
|
|
+ * to keep the integrity of the internal data structures. Callers should ensure
|
|
|
+ * that this function is *NOT* called under RCU protection or in contexts where
|
|
|
+ * mutex cannot be locked.
|
|
|
+ */
|
|
|
+int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
|
|
|
+ struct cpumask *cpumask)
|
|
|
+{
|
|
|
+ struct device_node *np, *tmp_np;
|
|
|
+ struct device *tcpu_dev;
|
|
|
+ int cpu, ret = 0;
|
|
|
+
|
|
|
+ /* Get OPP descriptor node */
|
|
|
+ np = _of_get_opp_desc_node(cpu_dev);
|
|
|
+ if (!np) {
|
|
|
+ dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__);
|
|
|
+ return -ENOENT;
|
|
|
+ }
|
|
|
+
|
|
|
+ cpumask_set_cpu(cpu_dev->id, cpumask);
|
|
|
+
|
|
|
+ /* OPPs are shared ? */
|
|
|
+ if (!of_property_read_bool(np, "opp-shared"))
|
|
|
+ goto put_cpu_node;
|
|
|
+
|
|
|
+ for_each_possible_cpu(cpu) {
|
|
|
+ if (cpu == cpu_dev->id)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ tcpu_dev = get_cpu_device(cpu);
|
|
|
+ if (!tcpu_dev) {
|
|
|
+ dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
|
|
|
+ __func__, cpu);
|
|
|
+ ret = -ENODEV;
|
|
|
+ goto put_cpu_node;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Get OPP descriptor node */
|
|
|
+ tmp_np = _of_get_opp_desc_node(tcpu_dev);
|
|
|
+ if (!tmp_np) {
|
|
|
+ dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n",
|
|
|
+ __func__);
|
|
|
+ ret = -ENOENT;
|
|
|
+ goto put_cpu_node;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* CPUs are sharing opp node */
|
|
|
+ if (np == tmp_np)
|
|
|
+ cpumask_set_cpu(cpu, cpumask);
|
|
|
+
|
|
|
+ of_node_put(tmp_np);
|
|
|
+ }
|
|
|
+
|
|
|
+put_cpu_node:
|
|
|
+ of_node_put(np);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
|
Viresh Kumar