| Message ID | 1471836984-6316-8-git-send-email-hl@rock-chips.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi, On Mon, Aug 22, 2016 at 11:36:23AM +0800, Lin Huang wrote: > base on dfi result, we do ddr frequency scaling, register > dmc driver to devfreq framework, and use simple-ondemand > policy. > > Signed-off-by: Lin Huang <hl@rock-chips.com> > Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> > --- > Changes in v7: > - remove a blank line > > Changes in v6: > - fix some nit suggest by Chanwoo Choi > > Changes in v5: > - improve dmc driver suggest by Chanwoo Choi > > Changes in v4: > - use arm_smccc_smc() function talk to bl31 > - delete rockchip_dmc.c file and config > - delete dmc_notify > - adjust probe order > > Changes in v3: > - operate dram setting through sip call > - imporve set rate flow > > Changes in v2: > - None > > Changes in v1: > - move dfi controller to event > - fix set voltage sequence when set rate fail > - change Kconfig type from tristate to bool > - move unuse EXPORT_SYMBOL_GPL() > > drivers/devfreq/Kconfig | 11 + > drivers/devfreq/Makefile | 1 + > drivers/devfreq/rk3399_dmc.c | 499 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 511 insertions(+) > create mode 100644 drivers/devfreq/rk3399_dmc.c > > diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig > index a5be56e..e848121 100644 > --- a/drivers/devfreq/Kconfig > +++ b/drivers/devfreq/Kconfig > @@ -100,6 +100,17 @@ config ARM_TEGRA_DEVFREQ > It reads ACTMON counters of memory controllers and adjusts the > operating frequencies and voltages with OPP support. > > +config ARM_RK3399_DMC_DEVFREQ > + tristate "ARM RK3399 DMC DEVFREQ Driver" > + depends on ARCH_ROCKCHIP > + select DEVFREQ_EVENT_ROCKCHIP_DFI > + select DEVFREQ_GOV_SIMPLE_ONDEMAND > + select PM_OPP > + help > + This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller). > + It sets the frequency for the memory controller and reads the usage counts > + from hardware. > + > source "drivers/devfreq/event/Kconfig" > > endif # PM_DEVFREQ > diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile > index 09f11d9..fbff40a 100644 > --- a/drivers/devfreq/Makefile > +++ b/drivers/devfreq/Makefile > @@ -8,6 +8,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o > > # DEVFREQ Drivers > obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o > +obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o > obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o > > # DEVFREQ Event Drivers > diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c > new file mode 100644 > index 0000000..b73a73c > --- /dev/null > +++ b/drivers/devfreq/rk3399_dmc.c > @@ -0,0 +1,499 @@ > +/* > + * 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 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; Are you actually using this after probe time, or are you just loading this straight into ATF? If the latter, then you can just use a stack variable, with no kmalloc() (and you *definitely* don't need devm_kzalloc()!). > + > + /* > + * 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; > + struct dev_pm_opp *curr_opp; > +}; > + > +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; > + > + rcu_read_lock(); > + opp = devfreq_recommended_opp(dev, freq, flags); > + if (IS_ERR(opp)) { > + rcu_read_unlock(); > + return PTR_ERR(opp); > + } > + > + target_rate = dev_pm_opp_get_freq(opp); > + target_volt = dev_pm_opp_get_voltage(opp); > + > + dmcfreq->rate = dev_pm_opp_get_freq(dmcfreq->curr_opp); > + dmcfreq->volt = dev_pm_opp_get_voltage(dmcfreq->curr_opp); > + > + rcu_read_unlock(); > + > + 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->curr_opp = opp; > +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 struct dram_timing *of_get_ddr_timings(struct device *dev, > + struct device_node *np) You can make 'struct dram_timing *' into an input parameter, and then just return an int -- 0 for succes, and negative/non-zero for not-found/error. > +{ > + struct dram_timing *timing = NULL; > + struct device_node *np_tim; > + int ret; > + > + np_tim = of_parse_phandle(np, "ddr_timing", 0); > + if (np_tim) { > + timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL); Why devm_*? If you're going to k[zm]alloc() at all, you should just free it in probe() after you're done with it. Then you don't need devm_* at all. > + if (!timing) > + goto err; > + > + ret = of_property_read_u32(np_tim, "ddr3_speed_bin", > + &timing->ddr3_speed_bin); > + ret |= of_property_read_u32(np_tim, "pd_idle", > + &timing->pd_idle); > + ret |= of_property_read_u32(np_tim, "sr_idle", > + &timing->sr_idle); > + ret |= of_property_read_u32(np_tim, "sr_mc_gate_idle", > + &timing->sr_mc_gate_idle); > + ret |= of_property_read_u32(np_tim, "srpd_lite_idle", > + &timing->srpd_lite_idle); > + ret |= of_property_read_u32(np_tim, "standby_idle", > + &timing->standby_idle); > + ret |= of_property_read_u32(np_tim, "dram_dll_dis_freq", > + &timing->dram_dll_dis_freq); > + ret |= of_property_read_u32(np_tim, "phy_dll_dis_freq", > + &timing->phy_dll_dis_freq); > + ret |= of_property_read_u32(np_tim, "ddr3_odt_dis_freq", > + &timing->ddr3_odt_dis_freq); > + ret |= of_property_read_u32(np_tim, "ddr3_drv", > + &timing->ddr3_drv); > + ret |= of_property_read_u32(np_tim, "ddr3_odt", > + &timing->ddr3_odt); > + ret |= of_property_read_u32(np_tim, "phy_ddr3_ca_drv", > + &timing->phy_ddr3_ca_drv); > + ret |= of_property_read_u32(np_tim, "phy_ddr3_dq_drv", > + &timing->phy_ddr3_dq_drv); > + ret |= of_property_read_u32(np_tim, "phy_ddr3_odt", > + &timing->phy_ddr3_odt); > + ret |= of_property_read_u32(np_tim, "lpddr3_odt_dis_freq", > + &timing->lpddr3_odt_dis_freq); > + ret |= of_property_read_u32(np_tim, "lpddr3_drv", > + &timing->lpddr3_drv); > + ret |= of_property_read_u32(np_tim, "lpddr3_odt", > + &timing->lpddr3_odt); > + ret |= of_property_read_u32(np_tim, "phy_lpddr3_ca_drv", > + &timing->phy_lpddr3_ca_drv); > + ret |= of_property_read_u32(np_tim, "phy_lpddr3_dq_drv", > + &timing->phy_lpddr3_dq_drv); > + ret |= of_property_read_u32(np_tim, "phy_lpddr3_odt", > + &timing->phy_lpddr3_odt); > + ret |= of_property_read_u32(np_tim, "lpddr4_odt_dis_freq", > + &timing->lpddr4_odt_dis_freq); > + ret |= of_property_read_u32(np_tim, "lpddr4_drv", > + &timing->lpddr4_drv); > + ret |= of_property_read_u32(np_tim, "lpddr4_dq_odt", > + &timing->lpddr4_dq_odt); > + ret |= of_property_read_u32(np_tim, "lpddr4_ca_odt", > + &timing->lpddr4_ca_odt); > + ret |= of_property_read_u32(np_tim, "phy_lpddr4_ca_drv", > + &timing->phy_lpddr4_ca_drv); > + ret |= of_property_read_u32(np_tim, "phy_lpddr4_ck_cs_drv", > + &timing->phy_lpddr4_ck_cs_drv); > + ret |= of_property_read_u32(np_tim, "phy_lpddr4_dq_drv", > + &timing->phy_lpddr4_dq_drv); > + ret |= of_property_read_u32(np_tim, "phy_lpddr4_odt", > + &timing->phy_lpddr4_odt); > + if (ret) { > + devm_kfree(dev, timing); This would be kfree() (not devm_kfree()). Or kill it entirely, if you have the caller just put this on the stack for us. Brian > + goto err; > + } > + of_node_put(np_tim); > + return timing; > + } > + > +err: > + if (timing) { > + devm_kfree(dev, timing); > + timing = NULL; > + } > + of_node_put(np_tim); > + return timing; > +} > + > +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\n"); > + return -EINVAL; > + } > + 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. > + */ > + data->timing = of_get_ddr_timings(dev, np); > + if (data->timing) { > + timing = (uint32_t *)data->timing; > + 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"); > + rcu_read_unlock(); > + 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); > + > + rcu_read_lock(); > + opp = devfreq_recommended_opp(dev, &data->rate, 0); > + if (IS_ERR(opp)) { > + rcu_read_unlock(); > + return PTR_ERR(opp); > + } > + rcu_read_unlock(); > + data->curr_opp = opp; > + > + rk3399_devfreq_dmc_profile.initial_freq = data->rate; > + > + data->devfreq = 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 int rk3399_dmcfreq_remove(struct platform_device *pdev) > +{ > + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); > + > + regulator_put(dmcfreq->vdd_center); > + > + return 0; > +} > + > +static const struct of_device_id rk3399dmc_devfreq_of_match[] = { > + { .compatible = "rockchip,rk3399-dmc" }, > + { }, > +}; > + > +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"); > -- > 2.6.6 >
diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index a5be56e..e848121 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -100,6 +100,17 @@ config ARM_TEGRA_DEVFREQ It reads ACTMON counters of memory controllers and adjusts the operating frequencies and voltages with OPP support. +config ARM_RK3399_DMC_DEVFREQ + tristate "ARM RK3399 DMC DEVFREQ Driver" + depends on ARCH_ROCKCHIP + select DEVFREQ_EVENT_ROCKCHIP_DFI + select DEVFREQ_GOV_SIMPLE_ONDEMAND + select PM_OPP + help + This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller). + It sets the frequency for the memory controller and reads the usage counts + from hardware. + source "drivers/devfreq/event/Kconfig" endif # PM_DEVFREQ diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile index 09f11d9..fbff40a 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o # DEVFREQ Drivers obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o +obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o # DEVFREQ Event Drivers diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c new file mode 100644 index 0000000..b73a73c --- /dev/null +++ b/drivers/devfreq/rk3399_dmc.c @@ -0,0 +1,499 @@ +/* + * 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 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; + struct dev_pm_opp *curr_opp; +}; + +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; + + rcu_read_lock(); + opp = devfreq_recommended_opp(dev, freq, flags); + if (IS_ERR(opp)) { + rcu_read_unlock(); + return PTR_ERR(opp); + } + + target_rate = dev_pm_opp_get_freq(opp); + target_volt = dev_pm_opp_get_voltage(opp); + + dmcfreq->rate = dev_pm_opp_get_freq(dmcfreq->curr_opp); + dmcfreq->volt = dev_pm_opp_get_voltage(dmcfreq->curr_opp); + + rcu_read_unlock(); + + 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->curr_opp = opp; +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 struct dram_timing *of_get_ddr_timings(struct device *dev, + struct device_node *np) +{ + struct dram_timing *timing = NULL; + struct device_node *np_tim; + int ret; + + np_tim = of_parse_phandle(np, "ddr_timing", 0); + if (np_tim) { + timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL); + if (!timing) + goto err; + + ret = of_property_read_u32(np_tim, "ddr3_speed_bin", + &timing->ddr3_speed_bin); + ret |= of_property_read_u32(np_tim, "pd_idle", + &timing->pd_idle); + ret |= of_property_read_u32(np_tim, "sr_idle", + &timing->sr_idle); + ret |= of_property_read_u32(np_tim, "sr_mc_gate_idle", + &timing->sr_mc_gate_idle); + ret |= of_property_read_u32(np_tim, "srpd_lite_idle", + &timing->srpd_lite_idle); + ret |= of_property_read_u32(np_tim, "standby_idle", + &timing->standby_idle); + ret |= of_property_read_u32(np_tim, "dram_dll_dis_freq", + &timing->dram_dll_dis_freq); + ret |= of_property_read_u32(np_tim, "phy_dll_dis_freq", + &timing->phy_dll_dis_freq); + ret |= of_property_read_u32(np_tim, "ddr3_odt_dis_freq", + &timing->ddr3_odt_dis_freq); + ret |= of_property_read_u32(np_tim, "ddr3_drv", + &timing->ddr3_drv); + ret |= of_property_read_u32(np_tim, "ddr3_odt", + &timing->ddr3_odt); + ret |= of_property_read_u32(np_tim, "phy_ddr3_ca_drv", + &timing->phy_ddr3_ca_drv); + ret |= of_property_read_u32(np_tim, "phy_ddr3_dq_drv", + &timing->phy_ddr3_dq_drv); + ret |= of_property_read_u32(np_tim, "phy_ddr3_odt", + &timing->phy_ddr3_odt); + ret |= of_property_read_u32(np_tim, "lpddr3_odt_dis_freq", + &timing->lpddr3_odt_dis_freq); + ret |= of_property_read_u32(np_tim, "lpddr3_drv", + &timing->lpddr3_drv); + ret |= of_property_read_u32(np_tim, "lpddr3_odt", + &timing->lpddr3_odt); + ret |= of_property_read_u32(np_tim, "phy_lpddr3_ca_drv", + &timing->phy_lpddr3_ca_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr3_dq_drv", + &timing->phy_lpddr3_dq_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr3_odt", + &timing->phy_lpddr3_odt); + ret |= of_property_read_u32(np_tim, "lpddr4_odt_dis_freq", + &timing->lpddr4_odt_dis_freq); + ret |= of_property_read_u32(np_tim, "lpddr4_drv", + &timing->lpddr4_drv); + ret |= of_property_read_u32(np_tim, "lpddr4_dq_odt", + &timing->lpddr4_dq_odt); + ret |= of_property_read_u32(np_tim, "lpddr4_ca_odt", + &timing->lpddr4_ca_odt); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_ca_drv", + &timing->phy_lpddr4_ca_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_ck_cs_drv", + &timing->phy_lpddr4_ck_cs_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_dq_drv", + &timing->phy_lpddr4_dq_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_odt", + &timing->phy_lpddr4_odt); + if (ret) { + devm_kfree(dev, timing); + goto err; + } + of_node_put(np_tim); + return timing; + } + +err: + if (timing) { + devm_kfree(dev, timing); + timing = NULL; + } + of_node_put(np_tim); + return timing; +} + +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\n"); + return -EINVAL; + } + 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. + */ + data->timing = of_get_ddr_timings(dev, np); + if (data->timing) { + timing = (uint32_t *)data->timing; + 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"); + rcu_read_unlock(); + 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); + + rcu_read_lock(); + opp = devfreq_recommended_opp(dev, &data->rate, 0); + if (IS_ERR(opp)) { + rcu_read_unlock(); + return PTR_ERR(opp); + } + rcu_read_unlock(); + data->curr_opp = opp; + + rk3399_devfreq_dmc_profile.initial_freq = data->rate; + + data->devfreq = 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 int rk3399_dmcfreq_remove(struct platform_device *pdev) +{ + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + + regulator_put(dmcfreq->vdd_center); + + return 0; +} + +static const struct of_device_id rk3399dmc_devfreq_of_match[] = { + { .compatible = "rockchip,rk3399-dmc" }, + { }, +}; + +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");