1 // SPDX-License-Identifier: GPL-2.0
3  * R-Car PWM Timer driver
8  * - The hardware cannot generate a 0% duty cycle.
21 #include <linux/pwm.h>
53 			   unsigned int offset)  in rcar_pwm_write()  argument
55 	writel(data, rp->base + offset);  in rcar_pwm_write()
58 static u32 rcar_pwm_read(struct rcar_pwm_chip *rp, unsigned int offset)  in rcar_pwm_read()  argument
60 	return readl(rp->base + offset);  in rcar_pwm_read()
64 			    unsigned int offset)  in rcar_pwm_update()  argument
68 	value = rcar_pwm_read(rp, offset);  in rcar_pwm_update()
71 	rcar_pwm_write(rp, value, offset);  in rcar_pwm_update()
76 	unsigned long clk_rate = clk_get_rate(rp->clk);  in rcar_pwm_get_clock_division()
80 		return -EINVAL;  in rcar_pwm_get_clock_division()
83 	tmp = (u64)period_ns * clk_rate + div - 1;  in rcar_pwm_get_clock_division()
85 	div = ilog2(tmp - 1) + 1;  in rcar_pwm_get_clock_division()
87 	return (div <= RCAR_PWM_MAX_DIVISION) ? div : -ERANGE;  in rcar_pwm_get_clock_division()
111 	unsigned long clk_rate = clk_get_rate(rp->clk);  in rcar_pwm_set_counter()
128 		return -EINVAL;  in rcar_pwm_set_counter()
135 static int rcar_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)  in rcar_pwm_request()  argument
137 	return pm_runtime_get_sync(chip->dev);  in rcar_pwm_request()
140 static void rcar_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)  in rcar_pwm_free()  argument
142 	pm_runtime_put(chip->dev);  in rcar_pwm_free()
149 	/* Don't enable the PWM device if CYC0 or PH0 is 0 */  in rcar_pwm_enable()
153 		return -EINVAL;  in rcar_pwm_enable()
165 static int rcar_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in rcar_pwm_apply()  argument
172 	if (state->polarity != PWM_POLARITY_NORMAL)  in rcar_pwm_apply()
173 		return -EINVAL;  in rcar_pwm_apply()
175 	if (!state->enabled) {  in rcar_pwm_apply()
180 	div = rcar_pwm_get_clock_division(rp, state->period);  in rcar_pwm_apply()
186 	ret = rcar_pwm_set_counter(rp, div, state->duty_cycle, state->period);  in rcar_pwm_apply()
211 	rcar_pwm = devm_kzalloc(&pdev->dev, sizeof(*rcar_pwm), GFP_KERNEL);  in rcar_pwm_probe()
213 		return -ENOMEM;  in rcar_pwm_probe()
215 	rcar_pwm->base = devm_platform_ioremap_resource(pdev, 0);  in rcar_pwm_probe()
216 	if (IS_ERR(rcar_pwm->base))  in rcar_pwm_probe()
217 		return PTR_ERR(rcar_pwm->base);  in rcar_pwm_probe()
219 	rcar_pwm->clk = devm_clk_get(&pdev->dev, NULL);  in rcar_pwm_probe()
220 	if (IS_ERR(rcar_pwm->clk)) {  in rcar_pwm_probe()
221 		dev_err(&pdev->dev, "cannot get clock\n");  in rcar_pwm_probe()
222 		return PTR_ERR(rcar_pwm->clk);  in rcar_pwm_probe()
227 	rcar_pwm->chip.dev = &pdev->dev;  in rcar_pwm_probe()
228 	rcar_pwm->chip.ops = &rcar_pwm_ops;  in rcar_pwm_probe()
229 	rcar_pwm->chip.npwm = 1;  in rcar_pwm_probe()
231 	pm_runtime_enable(&pdev->dev);  in rcar_pwm_probe()
233 	ret = pwmchip_add(&rcar_pwm->chip);  in rcar_pwm_probe()
235 		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", ret);  in rcar_pwm_probe()
236 		pm_runtime_disable(&pdev->dev);  in rcar_pwm_probe()
247 	pwmchip_remove(&rcar_pwm->chip);  in rcar_pwm_remove()
249 	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");