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7813dd6fc7
The drivers/base/power/ directory is special and contains code related to power management core like system suspend/resume, hibernation, etc. It was fine to keep the OPP code inside it when we had just one file for it, but it is growing now and already has a directory for itself. Lets move it directly under drivers/ directory, just like cpufreq and cpuidle. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
634 lines
16 KiB
C
634 lines
16 KiB
C
/*
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/slab.h>
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#include <linux/export.h>
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#include "opp.h"
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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, *managed_table = NULL;
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mutex_lock(&opp_table_lock);
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list_for_each_entry(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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if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
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_get_opp_table_kref(opp_table);
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managed_table = opp_table;
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}
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break;
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}
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}
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mutex_unlock(&opp_table_lock);
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return managed_table;
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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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* 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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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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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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if (!opp_table->supported_hw) {
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/*
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* In the case that no supported_hw has been set by the
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* platform but there is an opp-supported-hw value set for
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* an OPP then the OPP should not be enabled as there is
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* no way to see if the hardware supports it.
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*/
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if (of_find_property(np, "opp-supported-hw", NULL))
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return false;
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else
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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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/* 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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return true;
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}
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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, *microamp = NULL;
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int supplies, vcount, icount, ret, i, j;
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struct property *prop = NULL;
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char name[NAME_MAX];
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supplies = opp_table->regulator_count ? opp_table->regulator_count : 1;
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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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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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/* Missing property isn't a problem, but an invalid entry is */
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if (!prop) {
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if (!opp_table->regulator_count)
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return 0;
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dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
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__func__);
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return -EINVAL;
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}
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}
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vcount = of_property_count_u32_elems(opp->np, name);
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if (vcount < 0) {
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dev_err(dev, "%s: Invalid %s property (%d)\n",
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__func__, name, vcount);
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return vcount;
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}
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/* There can be one or three elements per supply */
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if (vcount != supplies && vcount != supplies * 3) {
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dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
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__func__, name, vcount, supplies);
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return -EINVAL;
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}
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microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL);
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if (!microvolt)
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return -ENOMEM;
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ret = of_property_read_u32_array(opp->np, name, microvolt, vcount);
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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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ret = -EINVAL;
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goto free_microvolt;
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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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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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if (prop) {
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icount = of_property_count_u32_elems(opp->np, name);
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if (icount < 0) {
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dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
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name, icount);
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ret = icount;
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goto free_microvolt;
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}
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if (icount != supplies) {
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dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
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__func__, name, icount, supplies);
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ret = -EINVAL;
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goto free_microvolt;
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}
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microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL);
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if (!microamp) {
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ret = -EINVAL;
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goto free_microvolt;
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}
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ret = of_property_read_u32_array(opp->np, name, microamp,
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icount);
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if (ret) {
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dev_err(dev, "%s: error parsing %s: %d\n", __func__,
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name, ret);
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ret = -EINVAL;
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goto free_microamp;
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}
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}
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for (i = 0, j = 0; i < supplies; i++) {
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opp->supplies[i].u_volt = microvolt[j++];
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if (vcount == supplies) {
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opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
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opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
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} else {
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opp->supplies[i].u_volt_min = microvolt[j++];
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opp->supplies[i].u_volt_max = microvolt[j++];
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}
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if (microamp)
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opp->supplies[i].u_amp = microamp[i];
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}
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free_microamp:
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kfree(microamp);
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free_microvolt:
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kfree(microvolt);
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return ret;
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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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void dev_pm_opp_of_remove_table(struct device *dev)
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{
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_dev_pm_opp_find_and_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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/* Returns opp descriptor node for a device node, caller must
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* do of_node_put() */
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static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np)
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{
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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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return of_parse_phandle(np, "operating-points-v2", 0);
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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 *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
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{
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return _opp_of_get_opp_desc_node(dev->of_node);
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
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/**
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* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
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* @opp_table: OPP table
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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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* 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 opp_table *opp_table, struct device *dev,
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struct device_node *np)
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{
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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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new_opp = _opp_allocate(opp_table);
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if (!new_opp)
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return -ENOMEM;
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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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/* 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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* 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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new_opp->np = np;
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new_opp->dynamic = false;
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new_opp->available = true;
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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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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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ret = _opp_add(dev, new_opp, opp_table);
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if (ret) {
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/* Don't return error for duplicate OPPs */
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if (ret == -EBUSY)
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ret = 0;
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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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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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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,
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new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
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new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns);
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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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blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
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return 0;
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free_opp:
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_opp_free(new_opp);
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return ret;
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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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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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goto put_opp_table;
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}
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opp_table = dev_pm_opp_get_opp_table(dev);
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if (!opp_table)
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return -ENOMEM;
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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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ret = _opp_add_static_v2(opp_table, 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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_dev_pm_opp_remove_table(opp_table, dev, false);
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goto put_opp_table;
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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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ret = -ENOENT;
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goto put_opp_table;
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}
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opp_table->np = opp_np;
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if (of_property_read_bool(opp_np, "opp-shared"))
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opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
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else
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opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
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put_opp_table:
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dev_pm_opp_put_opp_table(opp_table);
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return ret;
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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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struct opp_table *opp_table;
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const struct property *prop;
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const __be32 *val;
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int nr, ret = 0;
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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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* 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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opp_table = dev_pm_opp_get_opp_table(dev);
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if (!opp_table)
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return -ENOMEM;
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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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ret = _opp_add_v1(opp_table, dev, freq, volt, false);
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if (ret) {
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dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
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__func__, freq, ret);
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_dev_pm_opp_remove_table(opp_table, dev, false);
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break;
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}
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nr -= 2;
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}
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dev_pm_opp_put_opp_table(opp_table);
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return ret;
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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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* 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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* -ENODEV when 'operating-points' property is not found or is invalid data
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* in device node.
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* -ENODATA when empty 'operating-points' property is found
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* -EINVAL when invalid entries are found in opp-v2 table
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*/
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int dev_pm_opp_of_add_table(struct device *dev)
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{
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struct device_node *opp_np;
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int ret;
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/*
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* OPPs have two version of bindings now. The older one is deprecated,
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* try for the new binding first.
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*/
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opp_np = dev_pm_opp_of_get_opp_desc_node(dev);
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if (!opp_np) {
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/*
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* Try old-deprecated bindings for backward compatibility with
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* older dtbs.
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*/
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return _of_add_opp_table_v1(dev);
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}
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ret = _of_add_opp_table_v2(dev, opp_np);
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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.
|
|
*/
|
|
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.
|
|
*/
|
|
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) {
|
|
/*
|
|
* OPP may get registered dynamically, don't print error
|
|
* message here.
|
|
*/
|
|
pr_debug("%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.
|
|
*/
|
|
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
|
|
struct cpumask *cpumask)
|
|
{
|
|
struct device_node *np, *tmp_np, *cpu_np;
|
|
int cpu, ret = 0;
|
|
|
|
/* Get OPP descriptor node */
|
|
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
|
|
if (!np) {
|
|
dev_dbg(cpu_dev, "%s: Couldn't find opp 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;
|
|
|
|
cpu_np = of_get_cpu_node(cpu, NULL);
|
|
if (!cpu_np) {
|
|
dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
|
|
__func__, cpu);
|
|
ret = -ENOENT;
|
|
goto put_cpu_node;
|
|
}
|
|
|
|
/* Get OPP descriptor node */
|
|
tmp_np = _opp_of_get_opp_desc_node(cpu_np);
|
|
if (!tmp_np) {
|
|
pr_err("%pOF: Couldn't find opp node\n", cpu_np);
|
|
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);
|