2  * Marvell Berlin PWM driver
6  * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
19 #include <linux/pwm.h>
64 				   unsigned int channel, unsigned long offset)  in berlin_pwm_readl()  argument
66 	return readl_relaxed(bpc->base + channel * 0x10 + offset);  in berlin_pwm_readl()
71 				     unsigned long offset)  in berlin_pwm_writel()  argument
73 	writel_relaxed(value, bpc->base + channel * 0x10 + offset);  in berlin_pwm_writel()
76 static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in berlin_pwm_config()  argument
84 	cycles = clk_get_rate(bpc->clk);  in berlin_pwm_config()
93 			return -ERANGE;  in berlin_pwm_config()
101 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);  in berlin_pwm_config()
106 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);  in berlin_pwm_config()
108 	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);  in berlin_pwm_config()
109 	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);  in berlin_pwm_config()
115 				   struct pwm_device *pwm,  in berlin_pwm_set_polarity()  argument
121 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);  in berlin_pwm_set_polarity()
128 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);  in berlin_pwm_set_polarity()
133 static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in berlin_pwm_enable()  argument
138 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);  in berlin_pwm_enable()
140 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);  in berlin_pwm_enable()
146 			       struct pwm_device *pwm)  in berlin_pwm_disable()  argument
151 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);  in berlin_pwm_disable()
153 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);  in berlin_pwm_disable()
156 static int berlin_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in berlin_pwm_apply()  argument
160 	bool enabled = pwm->state.enabled;  in berlin_pwm_apply()
162 	if (state->polarity != pwm->state.polarity) {  in berlin_pwm_apply()
164 			berlin_pwm_disable(chip, pwm);  in berlin_pwm_apply()
168 		err = berlin_pwm_set_polarity(chip, pwm, state->polarity);  in berlin_pwm_apply()
173 	if (!state->enabled) {  in berlin_pwm_apply()
175 			berlin_pwm_disable(chip, pwm);  in berlin_pwm_apply()
179 	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);  in berlin_pwm_apply()
184 		return berlin_pwm_enable(chip, pwm);  in berlin_pwm_apply()
194 	{ .compatible = "marvell,berlin-pwm" },
204 	bpc = devm_kzalloc(&pdev->dev, sizeof(*bpc), GFP_KERNEL);  in berlin_pwm_probe()
206 		return -ENOMEM;  in berlin_pwm_probe()
208 	bpc->base = devm_platform_ioremap_resource(pdev, 0);  in berlin_pwm_probe()
209 	if (IS_ERR(bpc->base))  in berlin_pwm_probe()
210 		return PTR_ERR(bpc->base);  in berlin_pwm_probe()
212 	bpc->clk = devm_clk_get_enabled(&pdev->dev, NULL);  in berlin_pwm_probe()
213 	if (IS_ERR(bpc->clk))  in berlin_pwm_probe()
214 		return PTR_ERR(bpc->clk);  in berlin_pwm_probe()
216 	bpc->chip.dev = &pdev->dev;  in berlin_pwm_probe()
217 	bpc->chip.ops = &berlin_pwm_ops;  in berlin_pwm_probe()
218 	bpc->chip.npwm = BERLIN_PWM_NUMPWMS;  in berlin_pwm_probe()
220 	ret = devm_pwmchip_add(&pdev->dev, &bpc->chip);  in berlin_pwm_probe()
222 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");  in berlin_pwm_probe()
234 	for (i = 0; i < bpc->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()
254 	ret = clk_prepare_enable(bpc->clk);  in berlin_pwm_resume()
258 	for (i = 0; i < bpc->chip.npwm; i++) {  in berlin_pwm_resume()
259 		struct berlin_pwm_channel *channel = &bpc->channel[i];  in berlin_pwm_resume()
261 		berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);  in berlin_pwm_resume()
262 		berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);  in berlin_pwm_resume()
263 		berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);  in berlin_pwm_resume()
264 		berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);  in berlin_pwm_resume()
276 		.name = "berlin-pwm",
283 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
284 MODULE_DESCRIPTION("Marvell Berlin PWM driver");