Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934024AbbKSKVv (ORCPT ); Thu, 19 Nov 2015 05:21:51 -0500 Received: from mail-wm0-f65.google.com ([74.125.82.65]:35286 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932541AbbKSKVp (ORCPT ); Thu, 19 Nov 2015 05:21:45 -0500 From: Lin Huang To: heiko@sntech.de, dianders@chromium.org, mturquette@baylibre.com, myungjoo.ham@samsung.com, kyungmin.park@samsung.com Cc: linux-clk@vger.kernel.org, sboyd@codeaurora.org, dbasehore@chromium.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Lin Huang Subject: [PATCH 2/2] devfreq: rockchip: support rk3399 dmc devfreq Date: Thu, 19 Nov 2015 18:21:11 +0800 Message-Id: <1447928471-14448-3-git-send-email-hl@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1447928471-14448-1-git-send-email-hl@rock-chips.com> References: <1447928471-14448-1-git-send-email-hl@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11439 Lines: 401 rk3399 do ddr frequency scaling use devfreq framework, use simple_ondemand policy, and use rk3399 dfi controller to get ddr busy time. Signed-off-by: Lin Huang --- drivers/devfreq/Kconfig | 1 + drivers/devfreq/Makefile | 1 + drivers/devfreq/rockchip/Kconfig | 8 + drivers/devfreq/rockchip/Makefile | 1 + drivers/devfreq/rockchip/rk3399_dmc.c | 327 ++++++++++++++++++++++++++++++++++ 5 files changed, 338 insertions(+) create mode 100644 drivers/devfreq/rockchip/Kconfig create mode 100644 drivers/devfreq/rockchip/Makefile create mode 100644 drivers/devfreq/rockchip/rk3399_dmc.c diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index 64281bb..acb2a57 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -99,5 +99,6 @@ config ARM_TEGRA_DEVFREQ operating frequencies and voltages with OPP support. source "drivers/devfreq/event/Kconfig" +source "drivers/devfreq/rockchip/Kconfig" endif # PM_DEVFREQ diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile index 5134f9e..d844e23 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_DEVFREQ_GOV_USERSPACE) += governor_userspace.o obj-$(CONFIG_ARM_EXYNOS4_BUS_DEVFREQ) += exynos/ obj-$(CONFIG_ARM_EXYNOS5_BUS_DEVFREQ) += exynos/ obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o +obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ # DEVFREQ Event Drivers obj-$(CONFIG_PM_DEVFREQ_EVENT) += event/ diff --git a/drivers/devfreq/rockchip/Kconfig b/drivers/devfreq/rockchip/Kconfig new file mode 100644 index 0000000..ceb7f37 --- /dev/null +++ b/drivers/devfreq/rockchip/Kconfig @@ -0,0 +1,8 @@ +config ARM_RK3399_DMC_DEVFREQ + tristate "ARM RK3399 DMC DEVFREQ Driver" + depends on ARCH_ROCKCHIP + select PM_OPP + select DEVFREQ_GOV_SIMPLE_ONDEMAND + help + This adds the DEVFREQ driver for the RK3399 dmc. It sets the frequency + for the memory controller and reads the usage counts from hardware. diff --git a/drivers/devfreq/rockchip/Makefile b/drivers/devfreq/rockchip/Makefile new file mode 100644 index 0000000..c62c105 --- /dev/null +++ b/drivers/devfreq/rockchip/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o diff --git a/drivers/devfreq/rockchip/rk3399_dmc.c b/drivers/devfreq/rockchip/rk3399_dmc.c new file mode 100644 index 0000000..6bf4230 --- /dev/null +++ b/drivers/devfreq/rockchip/rk3399_dmc.c @@ -0,0 +1,327 @@ +/* + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RK3399_DMC_NUM_CH 2 + +/* DDRMON_CTRL */ +#define DDRMON_CTRL 0x04 +#define LPDDR4_EN (1 << 4) +#define HARDWARE_EN (1 << 3) +#define LPDDR3_EN (1 << 2) +#define SOFTWARE_EN (1 << 1) +#define TIME_CNT_EN (1 << 0) + +#define DDRMON_CH0_COUNT_NUM 0x28 +#define DDRMON_CH0_DFI_ACCESS_NUM 0x2c +#define DDRMON_CH1_COUNT_NUM 0x3c +#define DDRMON_CH1_DFI_ACCESS_NUM 0x40 + +struct dmc_usage { + u32 access; + u32 total; +}; + +struct rk3399_dmcfreq { + struct device *clk_dev; + struct devfreq *devfreq; + struct devfreq_simple_ondemand_data ondemand_data; + struct clk *dmc_clk; + struct regulator *vdd_logic; + struct dmc_usage ch_usage[RK3399_DMC_NUM_CH]; + struct rk3399_dmcclk *dmc_data; + struct mutex lock; + unsigned long rate, target_rate; + unsigned long volt, target_volt; +}; + +static struct rk3399_dmcfreq dmcfreq; + +static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq, + u32 flags) +{ + 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); + + opp = devfreq_recommended_opp(dev, &dmcfreq.rate, flags); + if (IS_ERR(opp)) { + rcu_read_unlock(); + return PTR_ERR(opp); + } + dmcfreq.volt = dev_pm_opp_get_voltage(opp); + rcu_read_unlock(); + + if (dmcfreq.rate == dmcfreq.target_rate) + return 0; + + mutex_lock(&dmcfreq.lock); + + if (old_clk_rate < target_rate) { + err = regulator_set_voltage(dmcfreq.vdd_logic, target_volt, + target_volt); + if (err) { + dev_err(dev, "Unable to set vol %lu\n", target_volt); + goto out; + } + } + + err = clk_set_rate(dmcfreq.dmc_clk, target_rate); + if (err) { + dev_err(dev, + "Unable to set freq %lu. Current freq %lu. Error %d\n", + target_rate, old_clk_rate, err); + regulator_set_voltage(dmcfreq.vdd_logic, dmcfreq.volt, + dmcfreq.volt); + goto out; + } + + dmcfreq.rate = target_rate; + + if (old_clk_rate > target_rate) + err = regulator_set_voltage(dmcfreq.vdd_logic, target_volt, + target_volt); + if (err) + dev_err(dev, "Unable to set vol %lu\n", target_volt); +out: + mutex_unlock(&dmcfreq.lock); + return err; +} + +static void rk3399_dmc_start_hardware_counter(void) +{ + void __iomem *ctrl_regs = dmcfreq.dmc_data->ctrl_regs; + void __iomem *dfi_regs = dmcfreq.dmc_data->dfi_regs; + u32 val; + u32 ddr_type; + + /* get ddr type */ + val = readl_relaxed(ctrl_regs + DENALI_CTL_00); + ddr_type = (val >> DRAM_CLASS_SHIFT) & DRAM_CLASS_MASK; + + /* set ddr type to dfi */ + val = readl_relaxed(dfi_regs + DDRMON_CTRL); + if (ddr_type == LPDDR3) { + val &= ~LPDDR4_EN; + val |= LPDDR3_EN; + } else if (ddr_type == LPDDR4) { + val &= ~LPDDR3_EN; + val |= LPDDR4_EN; + } else + val &= ~(LPDDR3_EN | LPDDR4_EN); + + /* enable count, use software mode */ + val &= ~HARDWARE_EN; + val |= SOFTWARE_EN; + + writel_relaxed(val, dfi_regs + DDRMON_CTRL); +} + +static void rk3399_dmc_stop_hardware_counter(void) +{ + void __iomem *dfi_regs = dmcfreq.dmc_data->dfi_regs; + u32 val; + + val = readl_relaxed(dfi_regs + DDRMON_CTRL); + val &= ~SOFTWARE_EN; + writel_relaxed(val, dfi_regs + DDRMON_CTRL); +} + +static int rk3399_dmc_get_busier_ch(void) +{ + u32 tmp, max = 0; + u32 i, busier_ch = 0; + void __iomem *dfi_regs = dmcfreq.dmc_data->dfi_regs; + + rk3399_dmc_stop_hardware_counter(); + + /* Find out which channel is busier */ + for (i = 0; i < RK3399_DMC_NUM_CH; i++) { + dmcfreq.ch_usage[i].access = readl_relaxed(dfi_regs + + DDRMON_CH0_DFI_ACCESS_NUM + i * 20); + dmcfreq.ch_usage[i].total = readl_relaxed(dfi_regs + + DDRMON_CH0_COUNT_NUM + i * 20); + tmp = dmcfreq.ch_usage[i].access; + if (tmp > max) { + busier_ch = i; + max = tmp; + } + } + rk3399_dmc_start_hardware_counter(); + + return busier_ch; +} + +static int rk3399_dmcfreq_get_dev_status(struct device *dev, + struct devfreq_dev_status *stat) +{ + int busier_ch; + + busier_ch = rk3399_dmc_get_busier_ch(); + stat->current_frequency = dmcfreq.rate; + stat->busy_time = dmcfreq.ch_usage[busier_ch].access; + stat->total_time = dmcfreq.ch_usage[busier_ch].total; + + return 0; +} + +static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq) +{ + *freq = dmcfreq.rate; + return 0; +} + +static void rk3399_dmcfreq_exit(struct device *dev) +{ + devfreq_unregister_opp_notifier(dmcfreq.clk_dev, dmcfreq.devfreq); +} + +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, + .exit = rk3399_dmcfreq_exit, +}; + +static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev) +{ + unsigned long freq = ULONG_MAX; + + dev_info(dmcfreq.clk_dev, "suspending DVFS and going to max freq\n"); + devfreq_suspend_device(dmcfreq.devfreq); + rk3399_dmc_stop_hardware_counter(); + rk3399_dmcfreq_target(dmcfreq.clk_dev, &freq, 0); + + return 0; +} + +static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev) +{ + dev_info(dmcfreq.clk_dev, "resuming DVFS\n"); + rk3399_dmc_start_hardware_counter(); + devfreq_resume_device(dmcfreq.devfreq); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend, + rk3399_dmcfreq_resume); + +static void rk3399_dmcfreq_shutdown(void) +{ + devfreq_suspend_device(dmcfreq.devfreq); +} + +static struct syscore_ops rk3399_dmcfreq_syscore_ops = { + .shutdown = rk3399_dmcfreq_shutdown, +}; + +static int rk3399_dmcfreq_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + dmcfreq.clk_dev = dev->parent; + mutex_init(&dmcfreq.lock); + + dmcfreq.dmc_data = + (struct rk3399_dmcclk *)dev_get_drvdata(dmcfreq.clk_dev); + + dmcfreq.vdd_logic = regulator_get(dmcfreq.clk_dev, "logic"); + if (IS_ERR(dmcfreq.vdd_logic)) { + dev_err(dev, "Cannot get the regulator \"vdd_logic\"\n"); + return PTR_ERR(dmcfreq.vdd_logic); + } + + dmcfreq.dmc_clk = devm_clk_get(dev, "dmc_clk"); + if (IS_ERR(dmcfreq.dmc_clk)) { + dev_err(dev, "Cannot get the clk dmc_clk\n"); + return PTR_ERR(dmcfreq.dmc_clk); + }; + + /* + * 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(dmcfreq.clk_dev)) { + dev_err(dev, "Invalid operating-points in device tree.\n"); + return -EINVAL; + } + + of_property_read_u32(dmcfreq.clk_dev->of_node, "upthreshold", + &dmcfreq.ondemand_data.upthreshold); + + of_property_read_u32(dmcfreq.clk_dev->of_node, "downdifferential", + &dmcfreq.ondemand_data.downdifferential); + + dmcfreq.devfreq = devfreq_add_device(dmcfreq.clk_dev, + &rk3399_devfreq_dmc_profile, + "simple_ondemand", + &dmcfreq.ondemand_data); + if (IS_ERR(dmcfreq.devfreq)) + return PTR_ERR(dmcfreq.devfreq); + + devfreq_register_opp_notifier(dmcfreq.clk_dev, dmcfreq.devfreq); + + register_syscore_ops(&rk3399_dmcfreq_syscore_ops); + + return 0; +} + +static int rk3399_dmcfreq_remove(struct platform_device *pdev) +{ + devfreq_remove_device(dmcfreq.devfreq); + regulator_put(dmcfreq.vdd_logic); + + return 0; +} + +static struct platform_driver rk3399_dmcfreq_driver = { + .probe = rk3399_dmcfreq_probe, + .remove = rk3399_dmcfreq_remove, + .driver = { + .name = "rk3399-dmc-freq", + .pm = &rk3399_dmcfreq_pm, + }, +}; +module_platform_driver(rk3399_dmcfreq_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/