465 lines
13 KiB
C
465 lines
13 KiB
C
/*
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* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd.
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* Author: Lin Huang <hl@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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope 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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#include <linux/arm-smccc.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/devfreq.h>
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#include <linux/devfreq-event.h>
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#include <linux/interrupt.h>
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#include <linux/module.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/regulator/consumer.h>
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#include <linux/rwsem.h>
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#include <linux/suspend.h>
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#include <soc/rockchip/rockchip_sip.h>
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struct dram_timing {
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unsigned int ddr3_speed_bin;
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unsigned int pd_idle;
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unsigned int sr_idle;
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unsigned int sr_mc_gate_idle;
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unsigned int srpd_lite_idle;
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unsigned int standby_idle;
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unsigned int auto_pd_dis_freq;
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unsigned int dram_dll_dis_freq;
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unsigned int phy_dll_dis_freq;
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unsigned int ddr3_odt_dis_freq;
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unsigned int ddr3_drv;
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unsigned int ddr3_odt;
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unsigned int phy_ddr3_ca_drv;
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unsigned int phy_ddr3_dq_drv;
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unsigned int phy_ddr3_odt;
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unsigned int lpddr3_odt_dis_freq;
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unsigned int lpddr3_drv;
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unsigned int lpddr3_odt;
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unsigned int phy_lpddr3_ca_drv;
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unsigned int phy_lpddr3_dq_drv;
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unsigned int phy_lpddr3_odt;
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unsigned int lpddr4_odt_dis_freq;
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unsigned int lpddr4_drv;
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unsigned int lpddr4_dq_odt;
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unsigned int lpddr4_ca_odt;
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unsigned int phy_lpddr4_ca_drv;
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unsigned int phy_lpddr4_ck_cs_drv;
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unsigned int phy_lpddr4_dq_drv;
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unsigned int phy_lpddr4_odt;
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};
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struct rk3399_dmcfreq {
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struct device *dev;
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struct devfreq *devfreq;
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struct devfreq_simple_ondemand_data ondemand_data;
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struct clk *dmc_clk;
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struct devfreq_event_dev *edev;
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struct mutex lock;
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struct dram_timing timing;
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/*
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* DDR Converser of Frequency (DCF) is used to implement DDR frequency
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* conversion without the participation of CPU, we will implement and
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* control it in arm trust firmware.
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*/
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wait_queue_head_t wait_dcf_queue;
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int irq;
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int wait_dcf_flag;
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struct regulator *vdd_center;
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unsigned long rate, target_rate;
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unsigned long volt, target_volt;
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};
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static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
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u32 flags)
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{
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struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
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struct dev_pm_opp *opp;
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unsigned long old_clk_rate = dmcfreq->rate;
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unsigned long target_volt, target_rate;
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int err;
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opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(opp))
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return PTR_ERR(opp);
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target_rate = dev_pm_opp_get_freq(opp);
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target_volt = dev_pm_opp_get_voltage(opp);
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dev_pm_opp_put(opp);
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if (dmcfreq->rate == target_rate)
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return 0;
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mutex_lock(&dmcfreq->lock);
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/*
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* If frequency scaling from low to high, adjust voltage first.
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* If frequency scaling from high to low, adjust frequency first.
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*/
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if (old_clk_rate < target_rate) {
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err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
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target_volt);
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if (err) {
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dev_err(dev, "Cannot to set voltage %lu uV\n",
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target_volt);
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goto out;
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}
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}
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dmcfreq->wait_dcf_flag = 1;
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err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
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if (err) {
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dev_err(dev, "Cannot to set frequency %lu (%d)\n",
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target_rate, err);
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regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
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dmcfreq->volt);
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goto out;
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}
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/*
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* Wait until bcf irq happen, it means freq scaling finish in
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* arm trust firmware, use 100ms as timeout time.
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*/
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if (!wait_event_timeout(dmcfreq->wait_dcf_queue,
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!dmcfreq->wait_dcf_flag, HZ / 10))
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dev_warn(dev, "Timeout waiting for dcf interrupt\n");
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/*
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* Check the dpll rate,
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* There only two result we will get,
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* 1. Ddr frequency scaling fail, we still get the old rate.
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* 2. Ddr frequency scaling sucessful, we get the rate we set.
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*/
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dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);
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/* If get the incorrect rate, set voltage to old value. */
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if (dmcfreq->rate != target_rate) {
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dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\
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Current frequency %lu\n", target_rate, dmcfreq->rate);
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regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
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dmcfreq->volt);
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goto out;
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} else if (old_clk_rate > target_rate)
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err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
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target_volt);
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if (err)
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dev_err(dev, "Cannot to set vol %lu uV\n", target_volt);
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dmcfreq->rate = target_rate;
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dmcfreq->volt = target_volt;
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out:
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mutex_unlock(&dmcfreq->lock);
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return err;
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}
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static int rk3399_dmcfreq_get_dev_status(struct device *dev,
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struct devfreq_dev_status *stat)
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{
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struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
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struct devfreq_event_data edata;
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int ret = 0;
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ret = devfreq_event_get_event(dmcfreq->edev, &edata);
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if (ret < 0)
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return ret;
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stat->current_frequency = dmcfreq->rate;
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stat->busy_time = edata.load_count;
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stat->total_time = edata.total_count;
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return ret;
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}
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static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
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{
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struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
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*freq = dmcfreq->rate;
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return 0;
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}
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static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = {
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.polling_ms = 200,
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.target = rk3399_dmcfreq_target,
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.get_dev_status = rk3399_dmcfreq_get_dev_status,
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.get_cur_freq = rk3399_dmcfreq_get_cur_freq,
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};
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static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
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{
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struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
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int ret = 0;
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ret = devfreq_event_disable_edev(dmcfreq->edev);
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if (ret < 0) {
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dev_err(dev, "failed to disable the devfreq-event devices\n");
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return ret;
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}
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ret = devfreq_suspend_device(dmcfreq->devfreq);
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if (ret < 0) {
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dev_err(dev, "failed to suspend the devfreq devices\n");
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return ret;
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}
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return 0;
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}
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static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
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{
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struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
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int ret = 0;
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ret = devfreq_event_enable_edev(dmcfreq->edev);
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if (ret < 0) {
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dev_err(dev, "failed to enable the devfreq-event devices\n");
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return ret;
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}
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ret = devfreq_resume_device(dmcfreq->devfreq);
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if (ret < 0) {
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dev_err(dev, "failed to resume the devfreq devices\n");
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return ret;
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}
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
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rk3399_dmcfreq_resume);
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static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id)
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{
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struct rk3399_dmcfreq *dmcfreq = dev_id;
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struct arm_smccc_res res;
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dmcfreq->wait_dcf_flag = 0;
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wake_up(&dmcfreq->wait_dcf_queue);
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/* Clear the DCF interrupt */
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arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
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ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ,
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0, 0, 0, 0, &res);
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return IRQ_HANDLED;
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}
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static int of_get_ddr_timings(struct dram_timing *timing,
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struct device_node *np)
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{
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int ret = 0;
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ret = of_property_read_u32(np, "rockchip,ddr3_speed_bin",
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&timing->ddr3_speed_bin);
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ret |= of_property_read_u32(np, "rockchip,pd_idle",
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&timing->pd_idle);
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ret |= of_property_read_u32(np, "rockchip,sr_idle",
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&timing->sr_idle);
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ret |= of_property_read_u32(np, "rockchip,sr_mc_gate_idle",
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&timing->sr_mc_gate_idle);
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ret |= of_property_read_u32(np, "rockchip,srpd_lite_idle",
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&timing->srpd_lite_idle);
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ret |= of_property_read_u32(np, "rockchip,standby_idle",
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&timing->standby_idle);
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ret |= of_property_read_u32(np, "rockchip,auto_pd_dis_freq",
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&timing->auto_pd_dis_freq);
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ret |= of_property_read_u32(np, "rockchip,dram_dll_dis_freq",
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&timing->dram_dll_dis_freq);
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ret |= of_property_read_u32(np, "rockchip,phy_dll_dis_freq",
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&timing->phy_dll_dis_freq);
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ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
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&timing->ddr3_odt_dis_freq);
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ret |= of_property_read_u32(np, "rockchip,ddr3_drv",
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&timing->ddr3_drv);
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ret |= of_property_read_u32(np, "rockchip,ddr3_odt",
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&timing->ddr3_odt);
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ret |= of_property_read_u32(np, "rockchip,phy_ddr3_ca_drv",
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&timing->phy_ddr3_ca_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_ddr3_dq_drv",
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&timing->phy_ddr3_dq_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_ddr3_odt",
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&timing->phy_ddr3_odt);
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ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
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&timing->lpddr3_odt_dis_freq);
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ret |= of_property_read_u32(np, "rockchip,lpddr3_drv",
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&timing->lpddr3_drv);
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ret |= of_property_read_u32(np, "rockchip,lpddr3_odt",
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&timing->lpddr3_odt);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_ca_drv",
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&timing->phy_lpddr3_ca_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_dq_drv",
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&timing->phy_lpddr3_dq_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_odt",
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&timing->phy_lpddr3_odt);
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ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
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&timing->lpddr4_odt_dis_freq);
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ret |= of_property_read_u32(np, "rockchip,lpddr4_drv",
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&timing->lpddr4_drv);
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ret |= of_property_read_u32(np, "rockchip,lpddr4_dq_odt",
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&timing->lpddr4_dq_odt);
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ret |= of_property_read_u32(np, "rockchip,lpddr4_ca_odt",
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&timing->lpddr4_ca_odt);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ca_drv",
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&timing->phy_lpddr4_ca_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ck_cs_drv",
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&timing->phy_lpddr4_ck_cs_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_dq_drv",
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&timing->phy_lpddr4_dq_drv);
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ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_odt",
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&timing->phy_lpddr4_odt);
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return ret;
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}
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static int rk3399_dmcfreq_probe(struct platform_device *pdev)
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{
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struct arm_smccc_res res;
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struct device *dev = &pdev->dev;
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struct device_node *np = pdev->dev.of_node;
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struct rk3399_dmcfreq *data;
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int ret, irq, index, size;
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uint32_t *timing;
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struct dev_pm_opp *opp;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev,
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"Cannot get the dmc interrupt resource: %d\n", irq);
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return irq;
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}
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data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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mutex_init(&data->lock);
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data->vdd_center = devm_regulator_get(dev, "center");
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if (IS_ERR(data->vdd_center)) {
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dev_err(dev, "Cannot get the regulator \"center\"\n");
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return PTR_ERR(data->vdd_center);
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}
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data->dmc_clk = devm_clk_get(dev, "dmc_clk");
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if (IS_ERR(data->dmc_clk)) {
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dev_err(dev, "Cannot get the clk dmc_clk\n");
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return PTR_ERR(data->dmc_clk);
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};
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data->irq = irq;
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ret = devm_request_irq(dev, irq, rk3399_dmc_irq, 0,
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dev_name(dev), data);
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if (ret) {
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dev_err(dev, "Failed to request dmc irq: %d\n", ret);
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return ret;
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}
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init_waitqueue_head(&data->wait_dcf_queue);
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data->wait_dcf_flag = 0;
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data->edev = devfreq_event_get_edev_by_phandle(dev, 0);
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if (IS_ERR(data->edev))
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return -EPROBE_DEFER;
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ret = devfreq_event_enable_edev(data->edev);
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if (ret < 0) {
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dev_err(dev, "failed to enable devfreq-event devices\n");
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return ret;
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}
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/*
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* Get dram timing and pass it to arm trust firmware,
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* the dram drvier in arm trust firmware will get these
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* timing and to do dram initial.
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*/
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if (!of_get_ddr_timings(&data->timing, np)) {
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timing = &data->timing.ddr3_speed_bin;
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size = sizeof(struct dram_timing) / 4;
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for (index = 0; index < size; index++) {
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arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, *timing++, index,
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ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM,
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0, 0, 0, 0, &res);
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if (res.a0) {
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dev_err(dev, "Failed to set dram param: %ld\n",
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res.a0);
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return -EINVAL;
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}
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}
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}
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arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
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ROCKCHIP_SIP_CONFIG_DRAM_INIT,
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0, 0, 0, 0, &res);
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/*
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* We add a devfreq driver to our parent since it has a device tree node
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* with operating points.
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*/
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if (dev_pm_opp_of_add_table(dev)) {
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dev_err(dev, "Invalid operating-points in device tree.\n");
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return -EINVAL;
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}
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of_property_read_u32(np, "upthreshold",
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&data->ondemand_data.upthreshold);
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of_property_read_u32(np, "downdifferential",
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&data->ondemand_data.downdifferential);
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data->rate = clk_get_rate(data->dmc_clk);
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opp = devfreq_recommended_opp(dev, &data->rate, 0);
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if (IS_ERR(opp))
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return PTR_ERR(opp);
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data->rate = dev_pm_opp_get_freq(opp);
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data->volt = dev_pm_opp_get_voltage(opp);
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dev_pm_opp_put(opp);
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rk3399_devfreq_dmc_profile.initial_freq = data->rate;
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data->devfreq = devm_devfreq_add_device(dev,
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&rk3399_devfreq_dmc_profile,
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"simple_ondemand",
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&data->ondemand_data);
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if (IS_ERR(data->devfreq))
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return PTR_ERR(data->devfreq);
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devm_devfreq_register_opp_notifier(dev, data->devfreq);
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data->dev = dev;
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
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{ .compatible = "rockchip,rk3399-dmc" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, rk3399dmc_devfreq_of_match);
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static struct platform_driver rk3399_dmcfreq_driver = {
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.probe = rk3399_dmcfreq_probe,
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.driver = {
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.name = "rk3399-dmc-freq",
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.pm = &rk3399_dmcfreq_pm,
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.of_match_table = rk3399dmc_devfreq_of_match,
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},
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};
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module_platform_driver(rk3399_dmcfreq_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
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MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");
|