2  * Marvell Berlin PWM driver
6  * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
13 #include <linux/clk.h>
19 #include <linux/pwm.h>
51 	struct clk *clk;  member
63 	return readl_relaxed(bpc->base + channel * 0x10 + offset);  in berlin_pwm_readl()
70 	writel_relaxed(value, bpc->base + channel * 0x10 + offset);  in berlin_pwm_writel()
73 static int berlin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)  in berlin_pwm_request()  argument
79 		return -ENOMEM;  in berlin_pwm_request()
81 	return pwm_set_chip_data(pwm, channel);  in berlin_pwm_request()
84 static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)  in berlin_pwm_free()  argument
86 	struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm);  in berlin_pwm_free()
91 static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in berlin_pwm_config()  argument
99 	cycles = clk_get_rate(bpc->clk);  in berlin_pwm_config()
108 			return -ERANGE;  in berlin_pwm_config()
116 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);  in berlin_pwm_config()
121 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);  in berlin_pwm_config()
123 	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);  in berlin_pwm_config()
124 	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);  in berlin_pwm_config()
130 				   struct pwm_device *pwm,  in berlin_pwm_set_polarity()  argument
136 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);  in berlin_pwm_set_polarity()
143 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);  in berlin_pwm_set_polarity()
148 static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in berlin_pwm_enable()  argument
153 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);  in berlin_pwm_enable()
155 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);  in berlin_pwm_enable()
161 			       struct pwm_device *pwm)  in berlin_pwm_disable()  argument
166 	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);  in berlin_pwm_disable()
168 	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);  in berlin_pwm_disable()
171 static int berlin_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in berlin_pwm_apply()  argument
175 	bool enabled = pwm->state.enabled;  in berlin_pwm_apply()
177 	if (state->polarity != pwm->state.polarity) {  in berlin_pwm_apply()
179 			berlin_pwm_disable(chip, pwm);  in berlin_pwm_apply()
183 		err = berlin_pwm_set_polarity(chip, pwm, state->polarity);  in berlin_pwm_apply()
188 	if (!state->enabled) {  in berlin_pwm_apply()
190 			berlin_pwm_disable(chip, pwm);  in berlin_pwm_apply()
194 	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);  in berlin_pwm_apply()
199 		return berlin_pwm_enable(chip, pwm);  in berlin_pwm_apply()
212 	{ .compatible = "marvell,berlin-pwm" },
222 	bpc = devm_kzalloc(&pdev->dev, sizeof(*bpc), GFP_KERNEL);  in berlin_pwm_probe()
224 		return -ENOMEM;  in berlin_pwm_probe()
226 	bpc->base = devm_platform_ioremap_resource(pdev, 0);  in berlin_pwm_probe()
227 	if (IS_ERR(bpc->base))  in berlin_pwm_probe()
228 		return PTR_ERR(bpc->base);  in berlin_pwm_probe()
230 	bpc->clk = devm_clk_get(&pdev->dev, NULL);  in berlin_pwm_probe()
231 	if (IS_ERR(bpc->clk))  in berlin_pwm_probe()
232 		return PTR_ERR(bpc->clk);  in berlin_pwm_probe()
234 	ret = clk_prepare_enable(bpc->clk);  in berlin_pwm_probe()
238 	bpc->chip.dev = &pdev->dev;  in berlin_pwm_probe()
239 	bpc->chip.ops = &berlin_pwm_ops;  in berlin_pwm_probe()
240 	bpc->chip.npwm = 4;  in berlin_pwm_probe()
242 	ret = pwmchip_add(&bpc->chip);  in berlin_pwm_probe()
244 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);  in berlin_pwm_probe()
245 		clk_disable_unprepare(bpc->clk);  in berlin_pwm_probe()
258 	pwmchip_remove(&bpc->chip);  in berlin_pwm_remove()
260 	clk_disable_unprepare(bpc->clk);  in berlin_pwm_remove()
269 	for (i = 0; i < bpc->chip.npwm; i++) {  in berlin_pwm_suspend()
272 		channel = pwm_get_chip_data(&bpc->chip.pwms[i]);  in berlin_pwm_suspend()
276 		channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);  in berlin_pwm_suspend()
277 		channel->ctrl = berlin_pwm_readl(bpc, i, BERLIN_PWM_CONTROL);  in berlin_pwm_suspend()
278 		channel->duty = berlin_pwm_readl(bpc, i, BERLIN_PWM_DUTY);  in berlin_pwm_suspend()
279 		channel->tcnt = berlin_pwm_readl(bpc, i, BERLIN_PWM_TCNT);  in berlin_pwm_suspend()
282 	clk_disable_unprepare(bpc->clk);  in berlin_pwm_suspend()
293 	ret = clk_prepare_enable(bpc->clk);  in berlin_pwm_resume()
297 	for (i = 0; i < bpc->chip.npwm; i++) {  in berlin_pwm_resume()
300 		channel = pwm_get_chip_data(&bpc->chip.pwms[i]);  in berlin_pwm_resume()
304 		berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);  in berlin_pwm_resume()
305 		berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);  in berlin_pwm_resume()
306 		berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);  in berlin_pwm_resume()
307 		berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);  in berlin_pwm_resume()
321 		.name = "berlin-pwm",
328 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
329 MODULE_DESCRIPTION("Marvell Berlin PWM driver");