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