From patchwork Wed Jun 1 09:35:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: huang lin X-Patchwork-Id: 9146919 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 28F8F60777 for ; Wed, 1 Jun 2016 09:38:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 153782040D for ; Wed, 1 Jun 2016 09:38:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 07CDB22473; Wed, 1 Jun 2016 09:38:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E1D07200E7 for ; Wed, 1 Jun 2016 09:38:14 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1b82Zz-0007z5-Os; Wed, 01 Jun 2016 09:36:47 +0000 Received: from mail-pf0-f196.google.com ([209.85.192.196]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1b82Zk-0007bO-DA; Wed, 01 Jun 2016 09:36:35 +0000 Received: by mail-pf0-f196.google.com with SMTP id f144so2898188pfa.2; Wed, 01 Jun 2016 02:36:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=8L6ZWxZteFooKjt63uiUWeOBgz5AIP7dlT0tJzhxk3E=; b=DixeYCzK9NbN2SCzVuP39AGcFvaAULhtHdxlC2TAn9h5fpyHjyaJV1oUKwPU2tWJrA bZ7p1WVoqG0reDg5q59yVTWeq7AJzqj9LPDUtgNHy0BbJJRtDDuqji4/ss5BaePj2Hwm lOObiOGtS5Dj2IIJWhmJpfA8Q/qDu27SdLiXnDfuFdAHE9vdfp1u7z8bR+HlQIIUIpzh RCpZKXWGyK5O6KVUsrum+USG58tQu387E2aBsVI83xiTWm3mX+k8H/ZUDQddehUW5KE6 RGpSwhr0p+W8FUyjkRFyS7v8LSF1rfc6zDAut/DXKNRyi/YlCZ+Tfcc6Okj1GayPKbtO vS3w== X-Gm-Message-State: ALyK8tI7LfT/G3b+JUytukBDNUZa98V3qDwocfRmIhvA7Iilxdd4QEEjWRH4EvIht8CMFw== X-Received: by 10.98.193.5 with SMTP id i5mr6760907pfg.64.1464773771900; Wed, 01 Jun 2016 02:36:11 -0700 (PDT) Received: from localhost.localdomain ([103.29.142.67]) by smtp.gmail.com with ESMTPSA id q127sm18173335pfb.34.2016.06.01.02.36.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 01 Jun 2016 02:36:11 -0700 (PDT) From: Lin Huang To: heiko@sntech.de, mark.yao@rock-chips.com, myungjoo.ham@samsung.com Subject: [RFC PATCH 3/4] PM / devfreq: rockchip: add devfreq driver for rk3399 dmc Date: Wed, 1 Jun 2016 17:35:38 +0800 Message-Id: <1464773739-18152-4-git-send-email-hl@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1464773739-18152-1-git-send-email-hl@rock-chips.com> References: <1464773739-18152-1-git-send-email-hl@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160601_023632_738332_1AFF7099 X-CRM114-Status: GOOD ( 24.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lin Huang , airlied@linux.ie, mturquette@baylibre.com, dbasehore@chromium.org, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, dianders@chromium.org, linux-rockchip@lists.infradead.org, kyungmin.park@samsung.com, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP there is dfi controller on rk3399 platform, it can monitor ddr load, register this controller to devfreq framework, and default to use simple_ondeamnd policy, and do ddr frequency scaling base on this result. Signed-off-by: Lin Huang --- drivers/devfreq/Kconfig | 2 +- drivers/devfreq/Makefile | 1 + drivers/devfreq/rockchip/Kconfig | 14 + drivers/devfreq/rockchip/Makefile | 2 + drivers/devfreq/rockchip/rk3399_dmc.c | 438 ++++++++++++++++++++++++++++++++ drivers/devfreq/rockchip/rockchip_dmc.c | 132 ++++++++++ include/soc/rockchip/rockchip_dmc.h | 44 ++++ 7 files changed, 632 insertions(+), 1 deletion(-) create mode 100644 drivers/devfreq/rockchip/Kconfig create mode 100644 drivers/devfreq/rockchip/Makefile create mode 100644 drivers/devfreq/rockchip/rk3399_dmc.c create mode 100644 drivers/devfreq/rockchip/rockchip_dmc.c create mode 100644 include/soc/rockchip/rockchip_dmc.h diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index 78dac0e..a883744 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -101,5 +101,5 @@ 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 09f11d9..48e2ae6 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o # DEVFREQ Drivers obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o +obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ # DEVFREQ Event Drivers obj-$(CONFIG_PM_DEVFREQ_EVENT) += event/ diff --git a/drivers/devfreq/rockchip/Kconfig b/drivers/devfreq/rockchip/Kconfig new file mode 100644 index 0000000..617b5fe --- /dev/null +++ b/drivers/devfreq/rockchip/Kconfig @@ -0,0 +1,14 @@ +config ARM_ROCKCHIP_DMC_DEVFREQ + tristate "ARM ROCKCHIP DMC DEVFREQ Driver" + depends on ARCH_ROCKCHIP + help + This adds the DEVFREQ driver framework for the rockchip dmc. + +config ARM_RK3399_DMC_DEVFREQ + tristate "ARM RK3399 DMC DEVFREQ Driver" + depends on ARM_ROCKCHIP_DMC_DEVFREQ + select PM_OPP + select DEVFREQ_GOV_SIMPLE_ONDEMAND + help + This adds the DEVFREQ driver for the RK3399 dmc. It sets the frequency + for the memory controller and reads the usage counts from hardware. diff --git a/drivers/devfreq/rockchip/Makefile b/drivers/devfreq/rockchip/Makefile new file mode 100644 index 0000000..caca525 --- /dev/null +++ b/drivers/devfreq/rockchip/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_ARM_ROCKCHIP_DMC_DEVFREQ) += rockchip_dmc.o +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..4907d38 --- /dev/null +++ b/drivers/devfreq/rockchip/rk3399_dmc.c @@ -0,0 +1,438 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd + * Author: Lin Huang + * + * 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 + +#include + +#define RK3399_DMC_NUM_CH 2 + +/* DDRMON_CTRL */ +#define DDRMON_CTRL 0x04 +#define CLR_DDRMON_CTRL (0x1f0000 << 0) +#define LPDDR4_EN (0x10001 << 4) +#define HARDWARE_EN (0x10001 << 3) +#define LPDDR3_EN (0x10001 << 2) +#define SOFTWARE_EN (0x10001 << 1) +#define TIME_CNT_EN (0x10001 << 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 + +/* pmu grf */ +#define PMUGRF_OS_REG2 0x308 +#define DDRTYPE_SHIFT 13 +#define DDRTYPE_MASK 7 + +enum { + DDR3 = 3, + LPDDR3 = 6, + LPDDR4 = 7, + UNUSED = 0xFF +}; + +struct dmc_usage { + u32 access; + u32 total; +}; + +struct rk3399_dmcfreq { + struct device *dev; + struct devfreq *devfreq; + struct devfreq_simple_ondemand_data ondemand_data; + struct clk *dmc_clk; + struct completion dcf_hold_completion; + struct dmc_usage ch_usage[RK3399_DMC_NUM_CH]; + struct mutex lock; + struct notifier_block dmc_nb; + int irq; + void __iomem *regs; + struct regmap *regmap_pmu; + 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 platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + 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 == 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, adjuset frequency first; + */ + if (old_clk_rate < target_rate) { + err = regulator_set_voltage(dmcfreq->vdd_center, target_volt, + target_volt); + if (err) { + dev_err(dev, "Unable to set vol %lu\n", target_volt); + goto out; + } + } + + dmc_event(DMCFREQ_ADJUST); + 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_center, dmcfreq->volt, + dmcfreq->volt); + dmc_event(DMCFREQ_FINISH); + goto out; + } + + /* wait until bcf irq happen, it means ddr scaling finish in bl31 */ + reinit_completion(&dmcfreq->dcf_hold_completion); + wait_for_completion(&dmcfreq->dcf_hold_completion); + dmc_event(DMCFREQ_FINISH); + + if (old_clk_rate > target_rate) + err = regulator_set_voltage(dmcfreq->vdd_center, target_volt, + target_volt); + if (err) + dev_err(dev, "Unable to set vol %lu\n", target_volt); + + /* check the rate we get whether correct */ + dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk); + if (dmcfreq->rate != target_rate) { + dev_err(dev, "get wrong ddr frequency, Request freq %lu,\ + Current freq %lu\n", target_rate, dmcfreq->rate); + regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt, + dmcfreq->volt); + } +out: + mutex_unlock(&dmcfreq->lock); + return err; +} + +static void rk3399_dmc_start_hardware_counter(struct device *dev) +{ + struct platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + void __iomem *dfi_regs = dmcfreq->regs; + u32 val; + u32 ddr_type; + + /* get ddr type */ + regmap_read(dmcfreq->regmap_pmu, PMUGRF_OS_REG2, &val); + ddr_type = (val >> DDRTYPE_SHIFT) & DDRTYPE_MASK; + + /* clear DDRMON_CTRL setting */ + writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL); + + /* set ddr type to dfi */ + if (ddr_type == LPDDR3) + writel_relaxed(LPDDR3_EN, dfi_regs + DDRMON_CTRL); + else if (ddr_type == LPDDR4) + writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL); + + /* enable count, use software mode */ + writel_relaxed(SOFTWARE_EN, dfi_regs + DDRMON_CTRL); +} + +static void rk3399_dmc_stop_hardware_counter(struct device *dev) +{ + struct platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + void __iomem *dfi_regs = dmcfreq->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(struct device *dev) +{ + struct platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + u32 tmp, max = 0; + u32 i, busier_ch = 0; + void __iomem *dfi_regs = dmcfreq->regs; + + rk3399_dmc_stop_hardware_counter(dev); + + /* 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(dev); + + return busier_ch; +} + +static int rk3399_dmcfreq_get_dev_status(struct device *dev, + struct devfreq_dev_status *stat) +{ + struct platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + int busier_ch; + + busier_ch = rk3399_dmc_get_busier_ch(dev); + 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) +{ + struct platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + + *freq = dmcfreq->rate; + + return 0; +} + +static void rk3399_dmcfreq_exit(struct device *dev) +{ + struct platform_device *pdev = container_of(dev, struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + + devfreq_unregister_opp_notifier(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) +{ + rockchip_dmc_disable(); + return 0; +} + +static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev) +{ + rockchip_dmc_enable(); + return 0; +} + +static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend, + rk3399_dmcfreq_resume); + +static int rk3399_dmc_enable_notify(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct rk3399_dmcfreq *dmcfreq = + container_of(nb, struct rk3399_dmcfreq, dmc_nb); + unsigned long freq = ULONG_MAX; + + if (event == DMC_ENABLE) { + devfreq_resume_device(dmcfreq->devfreq); + rk3399_dmc_start_hardware_counter(dmcfreq->dev); + return NOTIFY_OK; + } else if (event == DMC_DISABLE) { + devfreq_suspend_device(dmcfreq->devfreq); + rk3399_dmc_stop_hardware_counter(dmcfreq->dev); + + /* when disable dmc, set sdram to max frequency */ + rk3399_dmcfreq_target(dmcfreq->dev, &freq, 0); + return NOTIFY_OK; + } + + return NOTIFY_DONE; +} + +static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id) +{ + struct rk3399_dmcfreq *dmcfreq = dev_id; + + complete(&dmcfreq->dcf_hold_completion); + + return IRQ_HANDLED; +} + +static int rk3399_dmcfreq_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rk3399_dmcfreq *data; + struct resource *res; + int ret, irq; + struct device_node *np = pdev->dev.of_node, *node; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "no dmc irq resource\n"); + return -EINVAL; + } + + data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL); + if (!data) + return -ENOMEM; + + mutex_init(&data->lock); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->regs)) + return PTR_ERR(data->regs); + + 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); + }; + + /* + * 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->devfreq = devfreq_add_device(dev, + &rk3399_devfreq_dmc_profile, + "simple_ondemand", + &data->ondemand_data); + if (IS_ERR(data->devfreq)) + return PTR_ERR(data->devfreq); + + devfreq_register_opp_notifier(dev, data->devfreq); + + data->dmc_nb.notifier_call = rk3399_dmc_enable_notify; + dmc_register_notifier(&data->dmc_nb); + + data->irq = irq; + ret = devm_request_irq(dev, irq, rk3399_dmc_irq, IRQF_ONESHOT, + dev_name(dev), data); + if (ret) { + dev_err(dev, "failed to request dmc irq: %d\n", ret); + return ret; + } + + init_completion(&data->dcf_hold_completion); + + /* try to find the optional reference to the pmu syscon */ + node = of_parse_phandle(np, "rockchip,pmu", 0); + if (node) { + data->regmap_pmu = syscon_node_to_regmap(node); + if (IS_ERR(data->regmap_pmu)) + return PTR_ERR(data->regmap_pmu); + } + 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); + + devfreq_remove_device(dmcfreq->devfreq); + 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_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework"); diff --git a/drivers/devfreq/rockchip/rockchip_dmc.c b/drivers/devfreq/rockchip/rockchip_dmc.c new file mode 100644 index 0000000..ecc6598 --- /dev/null +++ b/drivers/devfreq/rockchip/rockchip_dmc.c @@ -0,0 +1,132 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd + * Author: Lin Huang + * Base on: https://chromium-review.googlesource.com/#/c/231477/ + * + * 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 + +static int num_wait; +static int num_disable; +static BLOCKING_NOTIFIER_HEAD(dmc_notifier_list); +static DEFINE_MUTEX(dmc_en_lock); +static DEFINE_MUTEX(dmc_sync_lock); + +void dmc_event(int event) +{ + mutex_lock(&dmc_sync_lock); + blocking_notifier_call_chain(&dmc_notifier_list, event, NULL); + mutex_unlock(&dmc_sync_lock); +} +EXPORT_SYMBOL_GPL(dmc_event); + +/** + * rockchip_dmc_enabled - Returns true if dmc freq is enabled, false otherwise. + */ +bool rockchip_dmc_enabled(void) +{ + return num_disable <= 0 && num_wait <= 1; +} +EXPORT_SYMBOL_GPL(rockchip_dmc_enabled); + +/** + * rockchip_dmc_enable - Enable dmc frequency scaling. Will only enable + * frequency scaling if there are 1 or fewer notifiers. Call to undo + * rockchip_dmc_disable. + */ +void rockchip_dmc_enable(void) +{ + mutex_lock(&dmc_en_lock); + num_disable--; + WARN_ON(num_disable < 0); + if (rockchip_dmc_enabled()) + dmc_event(DMC_ENABLE); + mutex_unlock(&dmc_en_lock); +} +EXPORT_SYMBOL_GPL(rockchip_dmc_enable); + +/** + * rockchip_dmc_disable - Disable dmc frequency scaling. Call when something + * cannot coincide with dmc frequency scaling. + */ +void rockchip_dmc_disable(void) +{ + mutex_lock(&dmc_en_lock); + if (rockchip_dmc_enabled()) + dmc_event(DMC_DISABLE); + num_disable++; + mutex_unlock(&dmc_en_lock); +} +EXPORT_SYMBOL_GPL(rockchip_dmc_disable); + +int dmc_register_notifier(struct notifier_block *nb) +{ + int ret; + + if (!nb) + return -EINVAL; + + ret = blocking_notifier_chain_register(&dmc_notifier_list, nb); + + return ret; +} +EXPORT_SYMBOL_GPL(dmc_register_notifier); + +int dmc_unregister_notifier(struct notifier_block *nb) +{ + int ret; + + if (!nb) + return -EINVAL; + + ret = blocking_notifier_chain_unregister(&dmc_notifier_list, nb); + + return ret; +} +EXPORT_SYMBOL_GPL(dmc_unregister_notifier); + +int rockchip_dmc_get(struct notifier_block *nb) +{ + if (!nb) + return -EINVAL; + + mutex_lock(&dmc_en_lock); + + /* if use two vop, need to disable dmc */ + if (num_wait == 1 && num_disable <= 0) + dmc_event(DMC_DISABLE); + num_wait++; + dmc_register_notifier(nb); + mutex_unlock(&dmc_en_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(rockchip_dmc_get); + +int rockchip_dmc_put(struct notifier_block *nb) +{ + if (!nb) + return -EINVAL; + + mutex_lock(&dmc_en_lock); + num_wait--; + + /* from 2 vop back to 1 vop, need enable dmc */ + if (num_wait == 1 && num_disable <= 0) + dmc_event(DMC_ENABLE); + dmc_unregister_notifier(nb); + mutex_unlock(&dmc_en_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(rockchip_dmc_put); diff --git a/include/soc/rockchip/rockchip_dmc.h b/include/soc/rockchip/rockchip_dmc.h new file mode 100644 index 0000000..6bb58d6 --- /dev/null +++ b/include/soc/rockchip/rockchip_dmc.h @@ -0,0 +1,44 @@ +/* + * Copyright (c) 2016, 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. + */ + +#ifndef __SOC_ROCKCHIP_DMC_H +#define __SOC_ROCKCHIP_DMC_H + +#include + +#define DMC_ENABLE 0 +#define DMC_DISABLE 1 +#define DMCFREQ_ADJUST 2 +#define DMCFREQ_FINISH 3 + +#ifdef CONFIG_ARM_ROCKCHIP_DMC_DEVFREQ +int rockchip_dmc_get(struct notifier_block *nb); +int rockchip_dmc_put(struct notifier_block *nb); +#else +static inline int rockchip_dmc_get(struct notifier_block *nb) +{ + return 0; +} +static inline int rockchip_dmc_put(struct notifier_block *nb) +{ + return 0; +} +#endif + +void dmc_event(int event); +int dmc_register_notifier(struct notifier_block *nb); +int dmc_unregister_notifier(struct notifier_block *nb); +void rockchip_dmc_enable(void); +void rockchip_dmc_disable(void); +bool rockchip_dmc_enabled(void); +#endif