From patchwork Sun Feb 25 13:53:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Zhang X-Patchwork-Id: 877544 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="k8ArPSZx"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zq5yW5RP4z9s25 for ; Mon, 26 Feb 2018 00:53:23 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751569AbeBYNxW (ORCPT ); Sun, 25 Feb 2018 08:53:22 -0500 Received: from mail-wr0-f194.google.com ([209.85.128.194]:33232 "EHLO mail-wr0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750987AbeBYNxU (ORCPT ); Sun, 25 Feb 2018 08:53:20 -0500 Received: by mail-wr0-f194.google.com with SMTP id s5so18551178wra.0; Sun, 25 Feb 2018 05:53:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=uuX59Rc4EwJjwDho83cWYITCfeTZbsPL0ZDLghymS+0=; b=k8ArPSZxSvfmS8kYCuLjlnvU47dJczPCeJSTHkKrbMDAul8epAcAf3oZChISH0yzsl khTBtPUwdtzAFUwUk8YG9uz2iJeN2ZEEFckes6Q40BFcVB4i6FxL+Lag4u9nGm44fHQG lsSC0HKk370Z7ck6BUPypc66nbPlQuch3szCFNXUyI4FCu9JUCHhufBcOeHBI+n2KElX rjD6l7OZhBRITlvXjOCitx5hCinHwVwQx4r6ksqnwGgIqdCVdcKKEd2iEW5DWtbiRumi iRchNJ3KxIhsuNuMWZY0o+VtB6ImkkaPgoyuFKpQzQvhtoBI7PDXiHo+uyA9cQrPXiqA jIgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=uuX59Rc4EwJjwDho83cWYITCfeTZbsPL0ZDLghymS+0=; b=gG65EQhuRvAMxlKu3pBhOZBR4i4uc5ZLoMASDdJcTSRWeZOLhab5ReDrH2KoqaRZ5H ZAz3G6ti92uu+Jc5pbSG4zaOScIflHnw/lqskClkHy8u5Ie42XIO7ddl/nfuAdCZIIhi sebowWsoqpeF38l+P0n+OVd17dRQSWzqsfpELYPrBi28kDaxcuhUt0Il8EQXbCYKcfEZ d+iGyqXn2zM74EtnwugrxYXD70H3d9DcL5vbkx0JRRU2vkEzWAHlTzW70ov2HiLOz6jK +wzXBJZjzfxqEasHzbQeJ3aR1BYKLTSQfSV38Dnw3g78tNuOE3b1g/2tZ/46ZrDmpqxj 4pZg== X-Gm-Message-State: APf1xPCQ17KxU3sKBhmDqD/vNDPkIgO4zLL4IWSwxPohI+Q/k+35+mVH Q0SnLRwuFPvvUj6wSCyNJxxx69xb X-Google-Smtp-Source: AH8x227wAR/sGYh5KTjX5JRV2pxWD2qidK1Tkv+6wWVs3q6C+tk2WMg+DmseyvAwqUG1XnCts6VVag== X-Received: by 10.223.135.51 with SMTP id a48mr6610860wra.149.1519566798886; Sun, 25 Feb 2018 05:53:18 -0800 (PST) Received: from arx-s1 ([79.124.8.2]) by smtp.gmail.com with ESMTPSA id i12sm5786661wrc.28.2018.02.25.05.53.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 25 Feb 2018 05:53:18 -0800 (PST) Date: Sun, 25 Feb 2018 21:53:08 +0800 From: hao_zhang To: thierry.reding@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, wens@csie.org, maxime.ripard@free-electrons.com, Claudiu.Beznea@microchip.com Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pwm@vger.kernel.org, linux-sunxi@googlegroups.com, hao5781286@gmail.com Subject: [PATCH v2 4/4] ARM: PWM: add allwinner sun8i pwm support. Message-ID: <20180225135308.GA14561@arx-s1> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org This patch add allwinner sun8i pwm support. Signed-off-by: hao_zhang --- drivers/pwm/Kconfig | 10 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-sun8i.c | 401 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 412 insertions(+) create mode 100644 drivers/pwm/pwm-sun8i.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 763ee50..7e68d0f 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -444,6 +444,16 @@ config PWM_SUN4I To compile this driver as a module, choose M here: the module will be called pwm-sun4i. +config PWM_SUN8I + tristate "Allwinner PWM SUN8I support" + depends on ARCH_SUNXI || COMPILE_TEST + depends on HAS_IOMEM && COMMON_CLK + help + Generic PWM framework driver for Allwinner SoCs. + + To compile this driver as a module, choose M here: the module + will be called pwm-sun8i. + config PWM_TEGRA tristate "NVIDIA Tegra PWM support" depends on ARCH_TEGRA diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 0258a74..cd6bf40 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -44,6 +44,7 @@ obj-$(CONFIG_PWM_STM32) += pwm-stm32.o obj-$(CONFIG_PWM_STM32_LP) += pwm-stm32-lp.o obj-$(CONFIG_PWM_STMPE) += pwm-stmpe.o obj-$(CONFIG_PWM_SUN4I) += pwm-sun4i.o +obj-$(CONFIG_PWM_SUN8I) += pwm-sun8i.o obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o diff --git a/drivers/pwm/pwm-sun8i.c b/drivers/pwm/pwm-sun8i.c new file mode 100644 index 0000000..cf23b0a --- /dev/null +++ b/drivers/pwm/pwm-sun8i.c @@ -0,0 +1,401 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PWM_IRQ_ENABLE_REG 0x0000 +#define PCIE(ch) BIT(ch) + +#define PWM_IRQ_STATUS_REG 0x0004 +#define PIS(ch) BIT(ch) + +#define CAPTURE_IRQ_ENABLE_REG 0x0010 +#define CFIE(ch) BIT(ch << 1 + 1) +#define CRIE(ch) BIT(ch << 1) + +#define CAPTURE_IRQ_STATUS_REG 0x0014 +#define CFIS(ch) BIT(ch << 1 + 1) +#define CRIS(ch) BIT(ch << 1) + +#define CLK_CFG_REG(ch) (0x0020 + (ch >> 1) * 4) +#define CLK_SRC BIT(7) +#define CLK_SRC_BYPASS_SEC BIT(6) +#define CLK_SRC_BYPASS_FIR BIT(5) +#define CLK_GATING BIT(4) +#define CLK_DIV_M GENMASK(3, 0) + +#define PWM_DZ_CTR_REG(ch) (0x0030 + (ch >> 1) * 4) +#define PWM_DZ_INTV GENMASK(15, 8) +#define PWM_DZ_EN BIT(0) + +#define PWM_ENABLE_REG 0x0040 +#define PWM_EN(ch) BIT(ch) + +#define CAPTURE_ENABLE_REG 0x0044 +#define CAP_EN(ch) BIT(ch) + +#define PWM_CTR_REG(ch) (0x0060 + ch * 0x20) +#define PWM_PERIOD_RDY BIT(11) +#define PWM_PUL_START BIT(10) +#define PWM_MODE BIT(9) +#define PWM_ACT_STA BIT(8) +#define PWM_PRESCAL_K GENMASK(7, 0) + +#define PWM_PERIOD_REG(ch) (0x0064 + ch * 0x20) +#define PWM_ENTIRE_CYCLE GENMASK(31, 16) +#define PWM_ACT_CYCLE GENMASK(15, 0) + +#define PWM_CNT_REG(ch) (0x0068 + ch * 0x20) +#define PWM_CNT_VAL GENMASK(15, 0) + +#define CAPTURE_CTR_REG(ch) (0x006c + ch * 0x20) +#define CAPTURE_CRLF BIT(2) +#define CAPTURE_CFLF BIT(1) +#define CAPINV BIT(0) + +#define CAPTURE_RISE_REG(ch) (0x0070 + ch * 0x20) +#define CAPTURE_CRLR GENMASK(15, 0) + +#define CAPTURE_FALL_REG(ch) (0x0074 + ch * 0x20) +#define CAPTURE_CFLR GENMASK(15, 0) + +struct sun8i_pwm_data { + bool has_prescaler_bypass; + bool has_rdy; + unsigned int npwm; +}; + +struct sun8i_pwm_chip { + struct pwm_chip chip; + struct clk *clk; + void __iomem *base; + spinlock_t ctrl_lock; + const struct sun8i_pwm_data *data; + struct regmap *regmap; +}; + +static const u16 div_m_table[] = { + 1, + 2, + 4, + 8, + 16, + 32, + 64, + 128, + 256 +}; + +static inline struct sun8i_pwm_chip *to_sun8i_pwm_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct sun8i_pwm_chip, chip); +} + +static u32 sun8i_pwm_read(struct sun8i_pwm_chip *sun8i_pwm, + unsigned long offset) +{ + u32 val; + + regmap_read(sun8i_pwm->regmap, offset, &val); + + return val; +} + +static inline void sun8i_pwm_set_bit(struct sun8i_pwm_chip *sun8i_pwm, + unsigned long reg, u32 bit) +{ + regmap_update_bits(sun8i_pwm->regmap, reg, bit, bit); +} + +static inline void sun8i_pwm_clear_bit(struct sun8i_pwm_chip *sun8i_pwm, + unsigned long reg, u32 bit) +{ + regmap_update_bits(sun8i_pwm->regmap, reg, bit, 0); +} + +static inline void sun8i_pwm_set_value(struct sun8i_pwm_chip *sun8i_pwm, + unsigned long reg, u32 mask, u32 val) +{ + regmap_update_bits(sun8i_pwm->regmap, reg, mask, val); +} + +static void sun8i_pwm_set_polarity(struct sun8i_pwm_chip *chip, u32 ch, + enum pwm_polarity polarity) +{ + if (polarity == PWM_POLARITY_NORMAL) + sun8i_pwm_set_bit(chip, PWM_CTR_REG(ch), PWM_ACT_STA); + else + sun8i_pwm_clear_bit(chip, PWM_CTR_REG(ch), PWM_ACT_STA); +} + +static int sun8i_pwm_config(struct sun8i_pwm_chip *sun8i_pwm, u8 ch, + struct pwm_state *state) +{ + u64 clk_rate, clk_div, val; + u16 prescaler = 0; + u8 id = 0; + + clk_rate = clk_get_rate(sun8i_pwm->clk); + + if (clk_rate == 24000000) + sun8i_pwm_clear_bit(sun8i_pwm, CLK_CFG_REG(ch), CLK_SRC); + else + sun8i_pwm_set_bit(sun8i_pwm, CLK_CFG_REG(ch), CLK_SRC); + + if (sun8i_pwm->data->has_prescaler_bypass) { + /* pwm output bypass */ + if (ch % 2) + sun8i_pwm_set_bit(sun8i_pwm, CLK_CFG_REG(ch), + CLK_SRC_BYPASS_FIR); + else + sun8i_pwm_set_bit(sun8i_pwm, CLK_CFG_REG(ch), + CLK_SRC_BYPASS_SEC); + return 0; + } + + val = state->period * clk_rate; + do_div(val, NSEC_PER_SEC); + if (val < 1) { + dev_err(sun8i_pwm->chip.dev, + "Period expects a larger value\n"); + return -EINVAL; + } + + /* calculate and set prescalar, div table, pwn entrie cycle */ + clk_div = val; + + while (clk_div > 65535) { + prescaler++; + clk_div = val; + do_div(clk_div, prescaler + 1); + do_div(clk_div, div_m_table[id]); + + if (prescaler == 255) { + prescaler = 0; + id++; + if (id == 9) + return -EINVAL; + } + } + + sun8i_pwm_set_value(sun8i_pwm, PWM_PERIOD_REG(ch), + PWM_ENTIRE_CYCLE, clk_div << 16); + sun8i_pwm_set_value(sun8i_pwm, PWM_CTR_REG(ch), + PWM_PRESCAL_K, prescaler << 0); + sun8i_pwm_set_value(sun8i_pwm, CLK_CFG_REG(ch), + CLK_DIV_M, id << 0); + + /* set duty cycle */ + val = (prescaler + 1) * div_m_table[id] * clk_div; + val = state->period; + do_div(val, clk_div); + clk_div = state->duty_cycle; + do_div(clk_div, val); + + sun8i_pwm_set_value(sun8i_pwm, PWM_PERIOD_REG(ch), + PWM_ACT_CYCLE, clk_div << 0); + + return 0; +} + +static int sun8i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + int ret; + struct sun8i_pwm_chip *sun8i_pwm = to_sun8i_pwm_chip(chip); + struct pwm_state cstate; + + pwm_get_state(pwm, &cstate); + if (!cstate.enabled) { + ret = clk_prepare_enable(sun8i_pwm->clk); + if (ret) { + dev_err(chip->dev, "Failed to enable PWM clock\n"); + return ret; + } + } + + spin_lock(&sun8i_pwm->ctrl_lock); + + if ((cstate.period != state->period) || + (cstate.duty_cycle != state->duty_cycle)) { + ret = sun8i_pwm_config(sun8i_pwm, pwm->hwpwm, state); + if (ret) { + spin_unlock(&sun8i_pwm->ctrl_lock); + dev_err(chip->dev, "Failed to config PWM\n"); + return ret; + } + } + + if (state->polarity != cstate.polarity) + sun8i_pwm_set_polarity(sun8i_pwm, pwm->hwpwm, state->polarity); + + if (state->enabled) { + sun8i_pwm_set_bit(sun8i_pwm, + CLK_CFG_REG(pwm->hwpwm), CLK_GATING); + + sun8i_pwm_set_bit(sun8i_pwm, + PWM_ENABLE_REG, PWM_EN(pwm->hwpwm)); + } else { + sun8i_pwm_clear_bit(sun8i_pwm, + CLK_CFG_REG(pwm->hwpwm), CLK_GATING); + + sun8i_pwm_clear_bit(sun8i_pwm, + PWM_ENABLE_REG, PWM_EN(pwm->hwpwm)); + } + + spin_unlock(&sun8i_pwm->ctrl_lock); + + return 0; +} + +static void sun8i_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct sun8i_pwm_chip *sun8i_pwm = to_sun8i_pwm_chip(chip); + u64 clk_rate, tmp; + u32 val; + u16 clk_div, act_cycle; + u8 prescal, id; + + clk_rate = clk_get_rate(sun8i_pwm->clk); + + val = sun8i_pwm_read(sun8i_pwm, PWM_CTR_REG(pwm->hwpwm)); + if (PWM_ACT_STA & val) + state->polarity = PWM_POLARITY_NORMAL; + else + state->polarity = PWM_POLARITY_INVERSED; + + prescal = PWM_PRESCAL_K & val; + + val = sun8i_pwm_read(sun8i_pwm, PWM_ENABLE_REG); + if (PWM_EN(pwm->hwpwm) & val) + state->enabled = true; + else + state->enabled = false; + + val = sun8i_pwm_read(sun8i_pwm, PWM_PERIOD_REG(pwm->hwpwm)); + act_cycle = PWM_ACT_CYCLE & val; + clk_div = val >> 16; + + val = sun8i_pwm_read(sun8i_pwm, CLK_CFG_REG(pwm->hwpwm)); + id = CLK_DIV_M & val; + + tmp = act_cycle * prescal * div_m_table[id] * NSEC_PER_SEC; + state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate); + tmp = clk_div * prescal * div_m_table[id] * NSEC_PER_SEC; + state->period = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate); +} + +static const struct regmap_config sun8i_pwm_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = CAPTURE_FALL_REG(7), +}; + +static const struct pwm_ops sun8i_pwm_ops = { + .apply = sun8i_pwm_apply, + .get_state = sun8i_pwm_get_state, + .owner = THIS_MODULE, +}; + +static const struct sun8i_pwm_data sun8i_pwm_data_r40 = { + .has_prescaler_bypass = false, + .has_rdy = true, + .npwm = 8, +}; + +static const struct of_device_id sun8i_pwm_dt_ids[] = { + { + .compatible = "allwinner,sun8i-r40-pwm", + .data = &sun8i_pwm_data_r40, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, sun8i_pwm_dt_ids); + +static int sun8i_pwm_probe(struct platform_device *pdev) +{ + struct sun8i_pwm_chip *pwm; + struct resource *res; + int ret; + const struct of_device_id *match; + + match = of_match_device(sun8i_pwm_dt_ids, &pdev->dev); + if (!match) { + dev_err(&pdev->dev, "Error: No device match found\n"); + return -ENODEV; + } + + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); + if (!pwm) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pwm->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pwm->base)) + return PTR_ERR(pwm->base); + + pwm->regmap = devm_regmap_init_mmio(&pdev->dev, pwm->base, + &sun8i_pwm_regmap_config); + if (IS_ERR(pwm->regmap)) { + dev_err(&pdev->dev, "Failed to create regmap\n"); + return PTR_ERR(pwm->regmap); + } + + pwm->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(pwm->clk)) + return PTR_ERR(pwm->clk); + + pwm->data = match->data; + pwm->chip.dev = &pdev->dev; + pwm->chip.ops = &sun8i_pwm_ops; + pwm->chip.base = -1; + pwm->chip.npwm = pwm->data->npwm; + pwm->chip.of_xlate = of_pwm_xlate_with_flags; + pwm->chip.of_pwm_n_cells = 3; + + spin_lock_init(&pwm->ctrl_lock); + + ret = pwmchip_add(&pwm->chip); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to add PWM chip: %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, pwm); + + return 0; +} + +static int sun8i_pwm_remove(struct platform_device *pdev) +{ + struct sun8i_pwm_chip *pwm = platform_get_drvdata(pdev); + + return pwmchip_remove(&pwm->chip); +} + +static struct platform_driver sun8i_pwm_driver = { + .driver = { + .name = "sun8i-pwm", + .of_match_table = sun8i_pwm_dt_ids, + }, + .probe = sun8i_pwm_probe, + .remove = sun8i_pwm_remove, +}; +module_platform_driver(sun8i_pwm_driver); + +MODULE_ALIAS("platform: sun8i-pwm"); +MODULE_AUTHOR("Hao Zhang "); +MODULE_DESCRIPTION("Allwinner sun8i PWM driver"); +MODULE_LICENSE("GPL v2");