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drivers/pwm/pwm-clps711x.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * Cirrus Logic CLPS711X PWM driver |
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* Author: Alexander Shiyan <shc_work@mail.ru> |
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*/ #include <linux/clk.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pwm.h> struct clps711x_chip { struct pwm_chip chip; void __iomem *pmpcon; struct clk *clk; spinlock_t lock; }; static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip) { return container_of(chip, struct clps711x_chip, chip); } static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v) { /* PWM0 - bits 4..7, PWM1 - bits 8..11 */ u32 shift = (n + 1) * 4; unsigned long flags; u32 tmp; spin_lock_irqsave(&priv->lock, flags); tmp = readl(priv->pmpcon); tmp &= ~(0xf << shift); tmp |= v << shift; writel(tmp, priv->pmpcon); spin_unlock_irqrestore(&priv->lock, flags); } static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v) { /* Duty cycle 0..15 max */ |
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return DIV64_U64_ROUND_CLOSEST(v * 0xf, pwm->args.period); |
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} static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) { struct clps711x_chip *priv = to_clps711x_chip(chip); unsigned int freq = clk_get_rate(priv->clk); if (!freq) return -EINVAL; /* Store constant period value */ |
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pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq); |
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return 0; } static int clps711x_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct clps711x_chip *priv = to_clps711x_chip(chip); unsigned int duty; |
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if (period_ns != pwm->args.period) |
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return -EINVAL; duty = clps711x_get_duty(pwm, duty_ns); clps711x_pwm_update_val(priv, pwm->hwpwm, duty); return 0; } static int clps711x_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct clps711x_chip *priv = to_clps711x_chip(chip); unsigned int duty; duty = clps711x_get_duty(pwm, pwm_get_duty_cycle(pwm)); clps711x_pwm_update_val(priv, pwm->hwpwm, duty); return 0; } static void clps711x_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct clps711x_chip *priv = to_clps711x_chip(chip); clps711x_pwm_update_val(priv, pwm->hwpwm, 0); } static const struct pwm_ops clps711x_pwm_ops = { .request = clps711x_pwm_request, .config = clps711x_pwm_config, .enable = clps711x_pwm_enable, .disable = clps711x_pwm_disable, .owner = THIS_MODULE, }; static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip, const struct of_phandle_args *args) { if (args->args[0] >= chip->npwm) return ERR_PTR(-EINVAL); return pwm_request_from_chip(chip, args->args[0], NULL); } static int clps711x_pwm_probe(struct platform_device *pdev) { struct clps711x_chip *priv; struct resource *res; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); priv->pmpcon = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(priv->pmpcon)) return PTR_ERR(priv->pmpcon); priv->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(priv->clk)) return PTR_ERR(priv->clk); priv->chip.ops = &clps711x_pwm_ops; priv->chip.dev = &pdev->dev; priv->chip.base = -1; priv->chip.npwm = 2; priv->chip.of_xlate = clps711x_pwm_xlate; priv->chip.of_pwm_n_cells = 1; spin_lock_init(&priv->lock); platform_set_drvdata(pdev, priv); return pwmchip_add(&priv->chip); } static int clps711x_pwm_remove(struct platform_device *pdev) { struct clps711x_chip *priv = platform_get_drvdata(pdev); return pwmchip_remove(&priv->chip); } static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = { |
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{ .compatible = "cirrus,ep7209-pwm", }, |
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{ } }; MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids); static struct platform_driver clps711x_pwm_driver = { .driver = { .name = "clps711x-pwm", |
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.of_match_table = of_match_ptr(clps711x_pwm_dt_ids), }, .probe = clps711x_pwm_probe, .remove = clps711x_pwm_remove, }; module_platform_driver(clps711x_pwm_driver); MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver"); MODULE_LICENSE("GPL"); |