linux/drivers/devfreq/rk3399_dmc.c

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