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PM / AVS: rockchip-cpu-avs: add driver handling Rockchip cpu avs
This patch supports adjusting opp's voltage according to leakage Change-Id: Ifbb6b6fec03abe0c7708a148affe4d7646ce38fa Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
This commit is contained in:
Finley Xiao
@@ -18,3 +18,12 @@ config ROCKCHIP_IODOMAIN
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Say y here to enable support io domains on Rockchip SoCs. It is
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necessary for the io domain setting of the SoC to match the
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voltage supplied by the regulators.
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config ROCKCHIP_CPU_AVS
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bool "Rockchip CPU AVS support"
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depends on POWER_AVS && ARCH_ROCKCHIP && OF && CPU_FREQ
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depends on (ARM_CPU_TOPOLOGY || ARM64) && ROCKCHIP_EFUSE
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help
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Say y here to enable support CPU AVS on Rockchip SoCs.
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The cpu's operating voltage is adapted depending on leakage
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or pvtm.
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@@ -1,2 +1,3 @@
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obj-$(CONFIG_POWER_AVS_OMAP) += smartreflex.o
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obj-$(CONFIG_ROCKCHIP_IODOMAIN) += rockchip-io-domain.o
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obj-$(CONFIG_ROCKCHIP_CPU_AVS) += rockchip-cpu-avs.o
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394
drivers/power/avs/rockchip-cpu-avs.c
Normal file
394
drivers/power/avs/rockchip-cpu-avs.c
Normal file
@@ -0,0 +1,394 @@
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/*
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* Rockchip CPU AVS support.
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*
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* Copyright (c) 2016 Rockchip Electronics Co. Ltd.
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* Author: Finley Xiao <finley.xiao@rock-chips.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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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/cpufreq.h>
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#include <linux/cpumask.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_opp.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define MAX_CLUSTERS 2
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#define LEAKAGE_TABLE_END ~1
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#define INVALID_VALUE 0xff
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struct leakage_volt_table {
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unsigned int min;
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unsigned int max;
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int volt;
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};
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struct cluster_info {
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unsigned int id;
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int offset_volt;
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unsigned char leakage;
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unsigned int min_freq;
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unsigned int min_volt;
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struct leakage_volt_table *table;
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};
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struct rockchip_cpu_avs {
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unsigned int num_clusters;
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struct cluster_info *cluster;
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struct notifier_block cpufreq_notify;
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};
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#define notifier_to_avs(_n) container_of(_n, struct rockchip_cpu_avs, \
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cpufreq_notify)
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static void rockchip_adjust_opp_table(struct device *cpu_dev,
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struct cpufreq_frequency_table *table,
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struct cluster_info *cluster)
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{
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struct cpufreq_frequency_table *pos;
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struct dev_pm_opp *opp;
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unsigned long adjust_volt;
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if (!cluster->offset_volt)
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return;
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cpufreq_for_each_valid_entry(pos, table) {
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if (pos->frequency < cluster->min_freq)
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continue;
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rcu_read_lock();
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opp = dev_pm_opp_find_freq_exact(cpu_dev, pos->frequency * 1000,
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true);
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if (IS_ERR(opp)) {
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rcu_read_unlock();
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continue;
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}
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adjust_volt = dev_pm_opp_get_voltage(opp) +
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cluster->offset_volt;
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rcu_read_unlock();
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if (adjust_volt < cluster->min_volt)
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continue;
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dev_pm_opp_adjust_voltage(cpu_dev, pos->frequency * 1000,
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adjust_volt);
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}
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}
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static int rockchip_cpu_avs_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct rockchip_cpu_avs *avs = notifier_to_avs(nb);
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struct cpufreq_policy *policy = data;
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struct cluster_info *cluster;
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struct device *cpu_dev;
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int i, id, cpu = policy->cpu;
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if (event != CPUFREQ_START)
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goto out;
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id = topology_physical_package_id(cpu);
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if (id < 0 || id >= MAX_CLUSTERS) {
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pr_err("cpu%d invalid cluster id\n", cpu);
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goto out;
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}
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for (i = 0; i < avs->num_clusters; i++) {
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if (avs->cluster[i].id == id)
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break;
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}
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if (i == avs->num_clusters)
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goto out;
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else
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cluster = &avs->cluster[i];
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if (!policy->freq_table) {
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pr_err("cpu%d freq table not found\n", cpu);
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goto out;
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}
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev) {
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pr_err("cpu%d failed to get device\n", cpu);
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goto out;
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}
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rockchip_adjust_opp_table(cpu_dev, policy->freq_table, cluster);
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out:
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return NOTIFY_OK;
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}
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static int rockchip_get_leakage_volt_table(struct device_node *np,
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struct leakage_volt_table **table)
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{
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struct leakage_volt_table *volt_table;
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const struct property *prop;
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int count, i;
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prop = of_find_property(np, "leakage-adjust-volt", NULL);
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if (!prop) {
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pr_err("failed to find property leakage-adjust-volt\n");
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return -EINVAL;
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}
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if (!prop->value) {
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pr_err("property leakage-adjust-volt is NULL\n");
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return -ENODATA;
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}
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count = of_property_count_u32_elems(np, "leakage-adjust-volt");
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if (count < 0) {
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pr_err("Invalid property (%d)\n", count);
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return -EINVAL;
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}
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if (count % 3) {
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pr_err("Invalid number of elements in property (%d)\n", count);
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return -EINVAL;
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}
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volt_table = kzalloc(sizeof(*volt_table) * (count / 3 + 1), GFP_KERNEL);
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if (!volt_table)
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return -ENOMEM;
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for (i = 0; i < count / 3; i++) {
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of_property_read_u32_index(np, "leakage-adjust-volt", 3 * i,
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&volt_table[i].min);
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of_property_read_u32_index(np, "leakage-adjust-volt", 3 * i + 1,
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&volt_table[i].max);
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of_property_read_u32_index(np, "leakage-adjust-volt", 3 * i + 2,
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(u32 *)&volt_table[i].volt);
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}
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volt_table[i].min = 0;
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volt_table[i].max = 0;
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volt_table[i].volt = LEAKAGE_TABLE_END;
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*table = volt_table;
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return 0;
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}
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static int rockchip_get_leakage(struct device_node *np, unsigned char *leakage)
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{
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struct nvmem_cell *cell;
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unsigned char *buf;
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size_t len;
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cell = of_nvmem_cell_get(np, "cpu_leakage");
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if (IS_ERR(cell)) {
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pr_err("avs failed to get cpu_leakage cell\n");
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return PTR_ERR(cell);
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}
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buf = (unsigned char *)nvmem_cell_read(cell, &len);
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nvmem_cell_put(cell);
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if (IS_ERR(buf))
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return PTR_ERR(buf);
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if (buf[0] == INVALID_VALUE)
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return -EINVAL;
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*leakage = buf[0];
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kfree(buf);
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return 0;
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}
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static int rockchip_get_offset_volt(unsigned char leakage,
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struct leakage_volt_table *table, int *volt)
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{
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int i, j = -1;
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if (!table)
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return -EINVAL;
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for (i = 0; table[i].volt != LEAKAGE_TABLE_END; i++) {
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if (leakage >= (unsigned char)table[i].min)
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j = i;
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}
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if (j == -1)
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*volt = 0;
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else
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*volt = table[j].volt;
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return 0;
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}
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static int rockchip_of_parse_cpu_avs(struct device_node *np,
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struct cluster_info *cluster)
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{
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int ret;
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ret = of_property_read_u32(np, "cluster-id", &cluster->id);
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if (ret < 0) {
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pr_err("prop cluster-id missing\n");
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ret = -EINVAL;
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goto out;
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}
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if (cluster->id >= MAX_CLUSTERS) {
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pr_err("prop cluster-id invalid\n");
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ret = -EINVAL;
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goto out;
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}
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ret = of_property_read_u32(np, "min-freq", &cluster->min_freq);
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if (ret < 0) {
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pr_err("prop min_freq missing\n");
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ret = -EINVAL;
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goto out;
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}
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ret = of_property_read_u32(np, "min-volt", &cluster->min_volt);
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if (ret < 0) {
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pr_err("prop min_volt missing\n");
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ret = -EINVAL;
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goto out;
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}
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ret = rockchip_get_leakage_volt_table(np, &cluster->table);
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if (ret) {
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pr_err("prop leakage-adjust-volt invalid\n");
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ret = -EINVAL;
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goto out;
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}
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ret = rockchip_get_leakage(np, &cluster->leakage);
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if (ret) {
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pr_err("get leakage invalid\n");
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goto out;
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}
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ret = rockchip_get_offset_volt(cluster->leakage, cluster->table,
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&cluster->offset_volt);
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if (ret) {
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pr_err("get offset volt err\n");
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goto out;
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}
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pr_info("cluster%d leakage=%d adjust_volt=%d\n", cluster->id,
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cluster->leakage, cluster->offset_volt);
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out:
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return ret;
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}
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static int rockchip_cpu_avs_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np, *node;
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struct rockchip_cpu_avs *avs;
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int ret, num_clusters = 0, i = 0;
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np = of_find_node_by_name(NULL, "cpu-avs");
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if (!np) {
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pr_info("unable to find cpu-avs\n");
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return 0;
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}
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if (!of_device_is_available(np)) {
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pr_info("cpu-avs disabled\n");
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ret = 0;
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goto err;
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}
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for_each_available_child_of_node(np, node)
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num_clusters++;
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if (!num_clusters) {
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pr_info("cpu-avs child disabled\n");
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ret = 0;
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goto err;
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}
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avs = devm_kzalloc(dev, sizeof(*avs), GFP_KERNEL);
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if (!avs) {
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ret = -ENOMEM;
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goto err;
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}
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avs->cluster = devm_kzalloc(dev, sizeof(*avs->cluster) * num_clusters,
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GFP_KERNEL);
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if (!avs->cluster) {
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ret = -ENOMEM;
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goto err;
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}
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avs->num_clusters = num_clusters;
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for_each_available_child_of_node(np, node) {
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ret = rockchip_of_parse_cpu_avs(node, &avs->cluster[i++]);
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if (ret)
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goto err;
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}
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of_node_put(np);
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avs->cpufreq_notify.notifier_call = rockchip_cpu_avs_notifier;
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return cpufreq_register_notifier(&avs->cpufreq_notify,
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CPUFREQ_POLICY_NOTIFIER);
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err:
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of_node_put(np);
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return ret;
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}
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static struct platform_driver rockchip_cpu_avs_platdrv = {
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.driver = {
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.name = "rockchip-cpu-avs",
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},
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.probe = rockchip_cpu_avs_probe,
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};
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static int __init rockchip_cpu_avs_init(void)
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{
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struct platform_device *pdev;
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int ret;
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ret = platform_driver_register(&rockchip_cpu_avs_platdrv);
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if (ret)
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return ret;
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/*
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* Since there's no place to hold device registration code and no
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* device tree based way to match cpu-avs driver yet, both the driver
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* and the device registration codes are put here to handle defer
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* probing.
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*/
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pdev = platform_device_register_simple("rockchip-cpu-avs", -1, NULL, 0);
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if (IS_ERR(pdev)) {
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pr_err("failed to register rockchip-cpu-avs platform device\n");
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return PTR_ERR(pdev);
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}
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return 0;
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}
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module_init(rockchip_cpu_avs_init);
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MODULE_DESCRIPTION("Rockchip CPU AVS driver");
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MODULE_AUTHOR("Finley Xiao <finley.xiao@rock-chips.com>");
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MODULE_LICENSE("GPL v2");
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