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linux/drivers/devfreq/rk3399_dmc.c
Brian Norris 2e691421a2 PM / devfreq: rk3399_dmc: Block PMU during transitions 
See the previous patch ("soc: rockchip: power-domain: Manage resource
conflicts with firmware") for a thorough explanation of the conflicts.
While ARM Trusted Firmware may be modifying memory controller and
power-domain states, we need to block the kernel's power-domain driver.

If the power-domain driver is disabled, there is no resource conflict
and this becomes a no-op.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2022-05-09 03:38:07 +09:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd.
* Author: Lin Huang <hl@rock-chips.com>
*/
#include <linux/arm-smccc.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/devfreq.h>
#include <linux/devfreq-event.h>
#include <linux/interrupt.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/rwsem.h>
#include <linux/suspend.h>
#include <soc/rockchip/pm_domains.h>
#include <soc/rockchip/rk3399_grf.h>
#include <soc/rockchip/rockchip_sip.h>
#define NS_TO_CYCLE(NS, MHz) (((NS) * (MHz)) / NSEC_PER_USEC)
#define RK3399_SET_ODT_PD_0_SR_IDLE GENMASK(7, 0)
#define RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE GENMASK(15, 8)
#define RK3399_SET_ODT_PD_0_STANDBY_IDLE GENMASK(31, 16)
#define RK3399_SET_ODT_PD_1_PD_IDLE GENMASK(11, 0)
#define RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE GENMASK(27, 16)
#define RK3399_SET_ODT_PD_2_ODT_ENABLE BIT(0)
struct rk3399_dmcfreq {
struct device *dev;
struct devfreq *devfreq;
struct devfreq_dev_profile profile;
struct devfreq_simple_ondemand_data ondemand_data;
struct clk *dmc_clk;
struct devfreq_event_dev *edev;
struct mutex lock;
struct regulator *vdd_center;
struct regmap *regmap_pmu;
unsigned long rate, target_rate;
unsigned long volt, target_volt;
unsigned int odt_dis_freq;
unsigned int pd_idle_ns;
unsigned int sr_idle_ns;
unsigned int sr_mc_gate_idle_ns;
unsigned int srpd_lite_idle_ns;
unsigned int standby_idle_ns;
unsigned int ddr3_odt_dis_freq;
unsigned int lpddr3_odt_dis_freq;
unsigned int lpddr4_odt_dis_freq;
unsigned int pd_idle_dis_freq;
unsigned int sr_idle_dis_freq;
unsigned int sr_mc_gate_idle_dis_freq;
unsigned int srpd_lite_idle_dis_freq;
unsigned int standby_idle_dis_freq;
};
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;
unsigned int ddrcon_mhz;
struct arm_smccc_res res;
int err;
u32 odt_pd_arg0 = 0;
u32 odt_pd_arg1 = 0;
u32 odt_pd_arg2 = 0;
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);
/*
* Ensure power-domain transitions don't interfere with ARM Trusted
* Firmware power-domain idling.
*/
err = rockchip_pmu_block();
if (err) {
dev_err(dev, "Failed to block PMU: %d\n", err);
goto out_unlock;
}
/*
* Some idle parameters may be based on the DDR controller clock, which
* is half of the DDR frequency.
* pd_idle and standby_idle are based on the controller clock cycle.
* sr_idle_cycle, sr_mc_gate_idle_cycle, and srpd_lite_idle_cycle
* are based on the 1024 controller clock cycle
*/
ddrcon_mhz = target_rate / USEC_PER_SEC / 2;
u32p_replace_bits(&odt_pd_arg1,
NS_TO_CYCLE(dmcfreq->pd_idle_ns, ddrcon_mhz),
RK3399_SET_ODT_PD_1_PD_IDLE);
u32p_replace_bits(&odt_pd_arg0,
NS_TO_CYCLE(dmcfreq->standby_idle_ns, ddrcon_mhz),
RK3399_SET_ODT_PD_0_STANDBY_IDLE);
u32p_replace_bits(&odt_pd_arg0,
DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_idle_ns,
ddrcon_mhz), 1024),
RK3399_SET_ODT_PD_0_SR_IDLE);
u32p_replace_bits(&odt_pd_arg0,
DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_mc_gate_idle_ns,
ddrcon_mhz), 1024),
RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE);
u32p_replace_bits(&odt_pd_arg1,
DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->srpd_lite_idle_ns,
ddrcon_mhz), 1024),
RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE);
if (dmcfreq->regmap_pmu) {
if (target_rate >= dmcfreq->sr_idle_dis_freq)
odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_IDLE;
if (target_rate >= dmcfreq->sr_mc_gate_idle_dis_freq)
odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE;
if (target_rate >= dmcfreq->standby_idle_dis_freq)
odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_STANDBY_IDLE;
if (target_rate >= dmcfreq->pd_idle_dis_freq)
odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_PD_IDLE;
if (target_rate >= dmcfreq->srpd_lite_idle_dis_freq)
odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE;
if (target_rate >= dmcfreq->odt_dis_freq)
odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;
/*
* This makes a SMC call to the TF-A to set the DDR PD
* (power-down) timings and to enable or disable the
* ODT (on-die termination) resistors.
*/
arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, odt_pd_arg0, odt_pd_arg1,
ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, odt_pd_arg2,
0, 0, 0, &res);
}
/*
* 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 set voltage %lu uV\n",
target_volt);
goto out;
}
}
err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
if (err) {
dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
err);
regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
dmcfreq->volt);
goto out;
}
/*
* 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, "Got wrong frequency, Request %lu, Current %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 set voltage %lu uV\n", target_volt);
dmcfreq->rate = target_rate;
dmcfreq->volt = target_volt;
out:
rockchip_pmu_unblock();
out_unlock:
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 __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 int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
struct device_node *np)
{
int ret = 0;
/*
* These are all optional, and serve as minimum bounds. Give them large
* (i.e., never "disabled") values if the DT doesn't specify one.
*/
data->pd_idle_dis_freq =
data->sr_idle_dis_freq =
data->sr_mc_gate_idle_dis_freq =
data->srpd_lite_idle_dis_freq =
data->standby_idle_dis_freq = UINT_MAX;
ret |= of_property_read_u32(np, "rockchip,pd-idle-ns",
&data->pd_idle_ns);
ret |= of_property_read_u32(np, "rockchip,sr-idle-ns",
&data->sr_idle_ns);
ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-ns",
&data->sr_mc_gate_idle_ns);
ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-ns",
&data->srpd_lite_idle_ns);
ret |= of_property_read_u32(np, "rockchip,standby-idle-ns",
&data->standby_idle_ns);
ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
&data->ddr3_odt_dis_freq);
ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
&data->lpddr3_odt_dis_freq);
ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
&data->lpddr4_odt_dis_freq);
ret |= of_property_read_u32(np, "rockchip,pd-idle-dis-freq-hz",
&data->pd_idle_dis_freq);
ret |= of_property_read_u32(np, "rockchip,sr-idle-dis-freq-hz",
&data->sr_idle_dis_freq);
ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-dis-freq-hz",
&data->sr_mc_gate_idle_dis_freq);
ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-dis-freq-hz",
&data->srpd_lite_idle_dis_freq);
ret |= of_property_read_u32(np, "rockchip,standby-idle-dis-freq-hz",
&data->standby_idle_dis_freq);
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, *node;
struct rk3399_dmcfreq *data;
int ret;
struct dev_pm_opp *opp;
u32 ddr_type;
u32 val;
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))
return dev_err_probe(dev, PTR_ERR(data->vdd_center),
"Cannot get the regulator \"center\"\n");
data->dmc_clk = devm_clk_get(dev, "dmc_clk");
if (IS_ERR(data->dmc_clk))
return dev_err_probe(dev, PTR_ERR(data->dmc_clk),
"Cannot get the clk dmc_clk\n");
data->edev = devfreq_event_get_edev_by_phandle(dev, "devfreq-events", 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;
}
rk3399_dmcfreq_of_props(data, np);
node = of_parse_phandle(np, "rockchip,pmu", 0);
if (!node)
goto no_pmu;
data->regmap_pmu = syscon_node_to_regmap(node);
of_node_put(node);
if (IS_ERR(data->regmap_pmu)) {
ret = PTR_ERR(data->regmap_pmu);
goto err_edev;
}
regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
RK3399_PMUGRF_DDRTYPE_MASK;
switch (ddr_type) {
case RK3399_PMUGRF_DDRTYPE_DDR3:
data->odt_dis_freq = data->ddr3_odt_dis_freq;
break;
case RK3399_PMUGRF_DDRTYPE_LPDDR3:
data->odt_dis_freq = data->lpddr3_odt_dis_freq;
break;
case RK3399_PMUGRF_DDRTYPE_LPDDR4:
data->odt_dis_freq = data->lpddr4_odt_dis_freq;
break;
default:
ret = -EINVAL;
goto err_edev;
}
no_pmu:
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 (devm_pm_opp_of_add_table(dev)) {
dev_err(dev, "Invalid operating-points in device tree.\n");
ret = -EINVAL;
goto err_edev;
}
data->ondemand_data.upthreshold = 25;
data->ondemand_data.downdifferential = 15;
data->rate = clk_get_rate(data->dmc_clk);
opp = devfreq_recommended_opp(dev, &data->rate, 0);
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
goto err_edev;
}
data->rate = dev_pm_opp_get_freq(opp);
data->volt = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
data->profile = (struct devfreq_dev_profile) {
.polling_ms = 200,
.target = rk3399_dmcfreq_target,
.get_dev_status = rk3399_dmcfreq_get_dev_status,
.get_cur_freq = rk3399_dmcfreq_get_cur_freq,
.initial_freq = data->rate,
};
data->devfreq = devm_devfreq_add_device(dev,
&data->profile,
DEVFREQ_GOV_SIMPLE_ONDEMAND,
&data->ondemand_data);
if (IS_ERR(data->devfreq)) {
ret = PTR_ERR(data->devfreq);
goto err_edev;
}
devm_devfreq_register_opp_notifier(dev, data->devfreq);
data->dev = dev;
platform_set_drvdata(pdev, data);
return 0;
err_edev:
devfreq_event_disable_edev(data->edev);
return ret;
}
static int rk3399_dmcfreq_remove(struct platform_device *pdev)
{
struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(&pdev->dev);
devfreq_event_disable_edev(dmcfreq->edev);
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,
.remove = rk3399_dmcfreq_remove,
.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");
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