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Release 4.14 drivers/pwm/pwm-berlin.c

Directory: drivers/pwm
/*
 * Marvell Berlin PWM driver
 *
 * Copyright (C) 2015 Marvell Technology Group Ltd.
 *
 * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>


#define BERLIN_PWM_EN			0x0

#define  BERLIN_PWM_ENABLE		BIT(0)

#define BERLIN_PWM_CONTROL		0x4

#define  BERLIN_PWM_PRESCALE_MASK	0x7

#define  BERLIN_PWM_PRESCALE_MAX	4096

#define  BERLIN_PWM_INVERT_POLARITY	BIT(3)

#define BERLIN_PWM_DUTY			0x8

#define BERLIN_PWM_TCNT			0xc

#define  BERLIN_PWM_MAX_TCNT		65535


struct berlin_pwm_channel {
	
u32 enable;
	
u32 ctrl;
	
u32 duty;
	
u32 tcnt;
};


struct berlin_pwm_chip {
	
struct pwm_chip chip;
	
struct clk *clk;
	
void __iomem *base;
};


static inline struct berlin_pwm_chip *to_berlin_pwm_chip(struct pwm_chip *chip) { return container_of(chip, struct berlin_pwm_chip, chip); }

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static const u32 prescaler_table[] = { 1, 4, 8, 16, 64, 256, 1024, 4096 };
static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *chip, unsigned int channel, unsigned long offset) { return readl_relaxed(chip->base + channel * 0x10 + offset); }

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static inline void berlin_pwm_writel(struct berlin_pwm_chip *chip, unsigned int channel, u32 value, unsigned long offset) { writel_relaxed(value, chip->base + channel * 0x10 + offset); }

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static int berlin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) { struct berlin_pwm_channel *channel; channel = kzalloc(sizeof(*channel), GFP_KERNEL); if (!channel) return -ENOMEM; return pwm_set_chip_data(pwm, channel); }

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static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm); pwm_set_chip_data(pwm, NULL); kfree(channel); }

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static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm_dev, int duty_ns, int period_ns) { struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip); unsigned int prescale; u32 value, duty, period; u64 cycles, tmp; cycles = clk_get_rate(pwm->clk); cycles *= period_ns; do_div(cycles, NSEC_PER_SEC); for (prescale = 0; prescale < ARRAY_SIZE(prescaler_table); prescale++) { tmp = cycles; do_div(tmp, prescaler_table[prescale]); if (tmp <= BERLIN_PWM_MAX_TCNT) break; } if (tmp > BERLIN_PWM_MAX_TCNT) return -ERANGE; period = tmp; cycles = tmp * duty_ns; do_div(cycles, period_ns); duty = cycles; value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL); value &= ~BERLIN_PWM_PRESCALE_MASK; value |= prescale; berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL); berlin_pwm_writel(pwm, pwm_dev->hwpwm, duty, BERLIN_PWM_DUTY); berlin_pwm_writel(pwm, pwm_dev->hwpwm, period, BERLIN_PWM_TCNT); return 0; }

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static int berlin_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm_dev, enum pwm_polarity polarity) { struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip); u32 value; value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL); if (polarity == PWM_POLARITY_NORMAL) value &= ~BERLIN_PWM_INVERT_POLARITY; else value |= BERLIN_PWM_INVERT_POLARITY; berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL); return 0; }

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static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm_dev) { struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip); u32 value; value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_EN); value |= BERLIN_PWM_ENABLE; berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_EN); return 0; }

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static void berlin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm_dev) { struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip); u32 value; value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_EN); value &= ~BERLIN_PWM_ENABLE; berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_EN); }

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static const struct pwm_ops berlin_pwm_ops = { .request = berlin_pwm_request, .free = berlin_pwm_free, .config = berlin_pwm_config, .set_polarity = berlin_pwm_set_polarity, .enable = berlin_pwm_enable, .disable = berlin_pwm_disable, .owner = THIS_MODULE, }; static const struct of_device_id berlin_pwm_match[] = { { .compatible = "marvell,berlin-pwm" }, { }, }; MODULE_DEVICE_TABLE(of, berlin_pwm_match);
static int berlin_pwm_probe(struct platform_device *pdev) { struct berlin_pwm_chip *pwm; struct resource *res; int ret; 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->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(pwm->clk)) return PTR_ERR(pwm->clk); ret = clk_prepare_enable(pwm->clk); if (ret) return ret; pwm->chip.dev = &pdev->dev; pwm->chip.ops = &berlin_pwm_ops; pwm->chip.base = -1; pwm->chip.npwm = 4; pwm->chip.of_xlate = of_pwm_xlate_with_flags; pwm->chip.of_pwm_n_cells = 3; ret = pwmchip_add(&pwm->chip); if (ret < 0) { dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret); clk_disable_unprepare(pwm->clk); return ret; } platform_set_drvdata(pdev, pwm); return 0; }

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static int berlin_pwm_remove(struct platform_device *pdev) { struct berlin_pwm_chip *pwm = platform_get_drvdata(pdev); int ret; ret = pwmchip_remove(&pwm->chip); clk_disable_unprepare(pwm->clk); return ret; }

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#ifdef CONFIG_PM_SLEEP
static int berlin_pwm_suspend(struct device *dev) { struct berlin_pwm_chip *pwm = dev_get_drvdata(dev); unsigned int i; for (i = 0; i < pwm->chip.npwm; i++) { struct berlin_pwm_channel *channel; channel = pwm_get_chip_data(&pwm->chip.pwms[i]); if (!channel) continue; channel->enable = berlin_pwm_readl(pwm, i, BERLIN_PWM_ENABLE); channel->ctrl = berlin_pwm_readl(pwm, i, BERLIN_PWM_CONTROL); channel->duty = berlin_pwm_readl(pwm, i, BERLIN_PWM_DUTY); channel->tcnt = berlin_pwm_readl(pwm, i, BERLIN_PWM_TCNT); } clk_disable_unprepare(pwm->clk); return 0; }

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static int berlin_pwm_resume(struct device *dev) { struct berlin_pwm_chip *pwm = dev_get_drvdata(dev); unsigned int i; int ret; ret = clk_prepare_enable(pwm->clk); if (ret) return ret; for (i = 0; i < pwm->chip.npwm; i++) { struct berlin_pwm_channel *channel; channel = pwm_get_chip_data(&pwm->chip.pwms[i]); if (!channel) continue; berlin_pwm_writel(pwm, i, channel->ctrl, BERLIN_PWM_CONTROL); berlin_pwm_writel(pwm, i, channel->duty, BERLIN_PWM_DUTY); berlin_pwm_writel(pwm, i, channel->tcnt, BERLIN_PWM_TCNT); berlin_pwm_writel(pwm, i, channel->enable, BERLIN_PWM_ENABLE); } return 0; }

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#endif static SIMPLE_DEV_PM_OPS(berlin_pwm_pm_ops, berlin_pwm_suspend, berlin_pwm_resume); static struct platform_driver berlin_pwm_driver = { .probe = berlin_pwm_probe, .remove = berlin_pwm_remove, .driver = { .name = "berlin-pwm", .of_match_table = berlin_pwm_match, .pm = &berlin_pwm_pm_ops, }, }; module_platform_driver(berlin_pwm_driver); MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>"); MODULE_DESCRIPTION("Marvell Berlin PWM driver"); MODULE_LICENSE("GPL v2");

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Directory: drivers/pwm
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