2  * Marvell Berlin PWM driver
6  * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
19 #include <linux/pwm.h>
63 				   unsigned int channel, unsigned long offset)  in berlin_pwm_readl()  argument
65 	return readl_relaxed(bpc->base + channel * 0x10 + offset);  in berlin_pwm_readl()
70 				     unsigned long offset)  in berlin_pwm_writel()  argument
72 	writel_relaxed(value, bpc->base + channel * 0x10 + offset);  in berlin_pwm_writel()
75 static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in berlin_pwm_config()  argument
83 	cycles = clk_get_rate(bpc->clk);  in berlin_pwm_config()
92 			return -ERANGE;  in berlin_pwm_config()
100 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);  in berlin_pwm_config()
105 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);  in berlin_pwm_config()
107 	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);  in berlin_pwm_config()
108 	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);  in berlin_pwm_config()
114 				   struct pwm_device *pwm,  in berlin_pwm_set_polarity()  argument
120 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);  in berlin_pwm_set_polarity()
127 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);  in berlin_pwm_set_polarity()
132 static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in berlin_pwm_enable()  argument
137 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);  in berlin_pwm_enable()
139 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);  in berlin_pwm_enable()
145 			       struct pwm_device *pwm)  in berlin_pwm_disable()  argument
150 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);  in berlin_pwm_disable()
152 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);  in berlin_pwm_disable()
155 static int berlin_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in berlin_pwm_apply()  argument
159 	bool enabled = pwm->state.enabled;  in berlin_pwm_apply()
161 	if (state->polarity != pwm->state.polarity) {  in berlin_pwm_apply()
163 			berlin_pwm_disable(chip, pwm);  in berlin_pwm_apply()
167 		err = berlin_pwm_set_polarity(chip, pwm, state->polarity);  in berlin_pwm_apply()
172 	if (!state->enabled) {  in berlin_pwm_apply()
174 			berlin_pwm_disable(chip, pwm);  in berlin_pwm_apply()
178 	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);  in berlin_pwm_apply()
183 		return berlin_pwm_enable(chip, pwm);  in berlin_pwm_apply()
193 	{ .compatible = "marvell,berlin-pwm" },
204 	chip = devm_pwmchip_alloc(&pdev->dev, BERLIN_PWM_NUMPWMS, sizeof(*bpc));  in berlin_pwm_probe()
209 	bpc->base = devm_platform_ioremap_resource(pdev, 0);  in berlin_pwm_probe()
210 	if (IS_ERR(bpc->base))  in berlin_pwm_probe()
211 		return PTR_ERR(bpc->base);  in berlin_pwm_probe()
213 	bpc->clk = devm_clk_get_enabled(&pdev->dev, NULL);  in berlin_pwm_probe()
214 	if (IS_ERR(bpc->clk))  in berlin_pwm_probe()
215 		return PTR_ERR(bpc->clk);  in berlin_pwm_probe()
217 	chip->ops = &berlin_pwm_ops;  in berlin_pwm_probe()
219 	ret = devm_pwmchip_add(&pdev->dev, chip);  in berlin_pwm_probe()
221 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");  in berlin_pwm_probe()
234 	for (i = 0; i < chip->npwm; i++) {  in berlin_pwm_suspend()
235 		struct berlin_pwm_channel *channel = &bpc->channel[i];  in berlin_pwm_suspend()
237 		channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);  in berlin_pwm_suspend()
238 		channel->ctrl = berlin_pwm_readl(bpc, i, BERLIN_PWM_CONTROL);  in berlin_pwm_suspend()
239 		channel->duty = berlin_pwm_readl(bpc, i, BERLIN_PWM_DUTY);  in berlin_pwm_suspend()
240 		channel->tcnt = berlin_pwm_readl(bpc, i, BERLIN_PWM_TCNT);  in berlin_pwm_suspend()
243 	clk_disable_unprepare(bpc->clk);  in berlin_pwm_suspend()
255 	ret = clk_prepare_enable(bpc->clk);  in berlin_pwm_resume()
259 	for (i = 0; i < chip->npwm; i++) {  in berlin_pwm_resume()
260 		struct berlin_pwm_channel *channel = &bpc->channel[i];  in berlin_pwm_resume()
262 		berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);  in berlin_pwm_resume()
263 		berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);  in berlin_pwm_resume()
264 		berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);  in berlin_pwm_resume()
265 		berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);  in berlin_pwm_resume()
277 		.name = "berlin-pwm",
284 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
285 MODULE_DESCRIPTION("Marvell Berlin PWM driver");