1 // SPDX-License-Identifier: GPL-2.0
3  * R-Car PWM Timer driver
8  * - The hardware cannot generate a 0% duty cycle.
20 #include <linux/pwm.h>
54 	writel(data, rp->base + offset);  in rcar_pwm_write()
59 	return readl(rp->base + offset);  in rcar_pwm_read()
75 	unsigned long clk_rate = clk_get_rate(rp->clk);  in rcar_pwm_get_clock_division()
79 		return -EINVAL;  in rcar_pwm_get_clock_division()
82 	tmp = (u64)period_ns * clk_rate + div - 1;  in rcar_pwm_get_clock_division()
84 	div = ilog2(tmp - 1) + 1;  in rcar_pwm_get_clock_division()
86 	return (div <= RCAR_PWM_MAX_DIVISION) ? div : -ERANGE;  in rcar_pwm_get_clock_division()
110 	unsigned long clk_rate = clk_get_rate(rp->clk);  in rcar_pwm_set_counter()
126 		return -EINVAL;  in rcar_pwm_set_counter()
133 static int rcar_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)  in rcar_pwm_request()  argument
135 	return pm_runtime_get_sync(chip->dev);  in rcar_pwm_request()
138 static void rcar_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)  in rcar_pwm_free()  argument
140 	pm_runtime_put(chip->dev);  in rcar_pwm_free()
147 	/* Don't enable the PWM device if CYC0 or PH0 is 0 */  in rcar_pwm_enable()
151 		return -EINVAL;  in rcar_pwm_enable()
163 static int rcar_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in rcar_pwm_apply()  argument
170 	if (state->polarity != PWM_POLARITY_NORMAL)  in rcar_pwm_apply()
171 		return -EINVAL;  in rcar_pwm_apply()
173 	if (!state->enabled) {  in rcar_pwm_apply()
178 	div = rcar_pwm_get_clock_division(rp, state->period);  in rcar_pwm_apply()
184 	ret = rcar_pwm_set_counter(rp, div, state->duty_cycle, state->period);  in rcar_pwm_apply()
209 	rcar_pwm = devm_kzalloc(&pdev->dev, sizeof(*rcar_pwm), GFP_KERNEL);  in rcar_pwm_probe()
211 		return -ENOMEM;  in rcar_pwm_probe()
213 	rcar_pwm->base = devm_platform_ioremap_resource(pdev, 0);  in rcar_pwm_probe()
214 	if (IS_ERR(rcar_pwm->base))  in rcar_pwm_probe()
215 		return PTR_ERR(rcar_pwm->base);  in rcar_pwm_probe()
217 	rcar_pwm->clk = devm_clk_get(&pdev->dev, NULL);  in rcar_pwm_probe()
218 	if (IS_ERR(rcar_pwm->clk)) {  in rcar_pwm_probe()
219 		dev_err(&pdev->dev, "cannot get clock\n");  in rcar_pwm_probe()
220 		return PTR_ERR(rcar_pwm->clk);  in rcar_pwm_probe()
225 	rcar_pwm->chip.dev = &pdev->dev;  in rcar_pwm_probe()
226 	rcar_pwm->chip.ops = &rcar_pwm_ops;  in rcar_pwm_probe()
227 	rcar_pwm->chip.npwm = 1;  in rcar_pwm_probe()
229 	pm_runtime_enable(&pdev->dev);  in rcar_pwm_probe()
231 	ret = pwmchip_add(&rcar_pwm->chip);  in rcar_pwm_probe()
233 		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", ret);  in rcar_pwm_probe()
234 		pm_runtime_disable(&pdev->dev);  in rcar_pwm_probe()
245 	pwmchip_remove(&rcar_pwm->chip);  in rcar_pwm_remove()
247 	pm_runtime_disable(&pdev->dev);  in rcar_pwm_remove()
253 	{ .compatible = "renesas,pwm-rcar", },
262 		.name = "pwm-rcar",
269 MODULE_DESCRIPTION("Renesas PWM Timer Driver");
271 MODULE_ALIAS("platform:pwm-rcar");