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>
51 			   unsigned int offset)  in rcar_pwm_write()  argument
53 	writel(data, rp->base + offset);  in rcar_pwm_write()
56 static u32 rcar_pwm_read(struct rcar_pwm_chip *rp, unsigned int offset)  in rcar_pwm_read()  argument
58 	return readl(rp->base + offset);  in rcar_pwm_read()
62 			    unsigned int offset)  in rcar_pwm_update()  argument
66 	value = rcar_pwm_read(rp, offset);  in rcar_pwm_update()
69 	rcar_pwm_write(rp, value, offset);  in rcar_pwm_update()
74 	unsigned long clk_rate = clk_get_rate(rp->clk);  in rcar_pwm_get_clock_division()
78 		return -EINVAL;  in rcar_pwm_get_clock_division()
81 	tmp = (u64)period_ns * clk_rate + div - 1;  in rcar_pwm_get_clock_division()
83 	div = ilog2(tmp - 1) + 1;  in rcar_pwm_get_clock_division()
85 	return (div <= RCAR_PWM_MAX_DIVISION) ? div : -ERANGE;  in rcar_pwm_get_clock_division()
109 	unsigned long clk_rate = clk_get_rate(rp->clk);  in rcar_pwm_set_counter()
125 		return -EINVAL;  in rcar_pwm_set_counter()
132 static int rcar_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)  in rcar_pwm_request()  argument
137 static void rcar_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)  in rcar_pwm_free()  argument
146 	/* Don't enable the PWM device if CYC0 or PH0 is 0 */  in rcar_pwm_enable()
150 		return -EINVAL;  in rcar_pwm_enable()
162 static int rcar_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in rcar_pwm_apply()  argument
169 	if (state->polarity != PWM_POLARITY_NORMAL)  in rcar_pwm_apply()
170 		return -EINVAL;  in rcar_pwm_apply()
172 	if (!state->enabled) {  in rcar_pwm_apply()
177 	div = rcar_pwm_get_clock_division(rp, state->period);  in rcar_pwm_apply()
183 	ret = rcar_pwm_set_counter(rp, div, state->duty_cycle, state->period);  in rcar_pwm_apply()
208 	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*rcar_pwm));  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()
223 	chip->ops = &rcar_pwm_ops;  in rcar_pwm_probe()
227 	pm_runtime_enable(&pdev->dev);  in rcar_pwm_probe()
231 		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", ret);  in rcar_pwm_probe()
232 		pm_runtime_disable(&pdev->dev);  in rcar_pwm_probe()
245 	pm_runtime_disable(&pdev->dev);  in rcar_pwm_remove()
249 	{ .compatible = "renesas,pwm-rcar", },
258 		.name = "pwm-rcar",
265 MODULE_DESCRIPTION("Renesas PWM Timer Driver");
267 MODULE_ALIAS("platform:pwm-rcar");