1 // SPDX-License-Identifier: GPL-2.0-only
3  * PWM driver for Rockchip SoCs
15 #include <linux/pwm.h>
60 				  struct pwm_device *pwm,  in rockchip_pwm_get_state()  argument
64 	u32 enable_conf = pc->data->enable_conf;  in rockchip_pwm_get_state()
70 	ret = clk_enable(pc->pclk);  in rockchip_pwm_get_state()
74 	ret = clk_enable(pc->clk);  in rockchip_pwm_get_state()
78 	clk_rate = clk_get_rate(pc->clk);  in rockchip_pwm_get_state()
80 	tmp = readl_relaxed(pc->base + pc->data->regs.period);  in rockchip_pwm_get_state()
81 	tmp *= pc->data->prescaler * NSEC_PER_SEC;  in rockchip_pwm_get_state()
82 	state->period = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);  in rockchip_pwm_get_state()
84 	tmp = readl_relaxed(pc->base + pc->data->regs.duty);  in rockchip_pwm_get_state()
85 	tmp *= pc->data->prescaler * NSEC_PER_SEC;  in rockchip_pwm_get_state()
86 	state->duty_cycle =  DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);  in rockchip_pwm_get_state()
88 	val = readl_relaxed(pc->base + pc->data->regs.ctrl);  in rockchip_pwm_get_state()
89 	state->enabled = (val & enable_conf) == enable_conf;  in rockchip_pwm_get_state()
91 	if (pc->data->supports_polarity && !(val & PWM_DUTY_POSITIVE))  in rockchip_pwm_get_state()
92 		state->polarity = PWM_POLARITY_INVERSED;  in rockchip_pwm_get_state()
94 		state->polarity = PWM_POLARITY_NORMAL;  in rockchip_pwm_get_state()
96 	clk_disable(pc->clk);  in rockchip_pwm_get_state()
97 	clk_disable(pc->pclk);  in rockchip_pwm_get_state()
102 static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in rockchip_pwm_config()  argument
110 	clk_rate = clk_get_rate(pc->clk);  in rockchip_pwm_config()
117 	div = clk_rate * state->period;  in rockchip_pwm_config()
119 				       pc->data->prescaler * NSEC_PER_SEC);  in rockchip_pwm_config()
121 	div = clk_rate * state->duty_cycle;  in rockchip_pwm_config()
122 	duty = DIV_ROUND_CLOSEST_ULL(div, pc->data->prescaler * NSEC_PER_SEC);  in rockchip_pwm_config()
128 	ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl);  in rockchip_pwm_config()
129 	if (pc->data->supports_lock) {  in rockchip_pwm_config()
131 		writel_relaxed(ctrl, pc->base + pc->data->regs.ctrl);  in rockchip_pwm_config()
134 	writel(period, pc->base + pc->data->regs.period);  in rockchip_pwm_config()
135 	writel(duty, pc->base + pc->data->regs.duty);  in rockchip_pwm_config()
137 	if (pc->data->supports_polarity) {  in rockchip_pwm_config()
139 		if (state->polarity == PWM_POLARITY_INVERSED)  in rockchip_pwm_config()
150 	if (pc->data->supports_lock)  in rockchip_pwm_config()
153 	writel(ctrl, pc->base + pc->data->regs.ctrl);  in rockchip_pwm_config()
157 			       struct pwm_device *pwm,  in rockchip_pwm_enable()  argument
161 	u32 enable_conf = pc->data->enable_conf;  in rockchip_pwm_enable()
166 		ret = clk_enable(pc->clk);  in rockchip_pwm_enable()
171 	val = readl_relaxed(pc->base + pc->data->regs.ctrl);  in rockchip_pwm_enable()
178 	writel_relaxed(val, pc->base + pc->data->regs.ctrl);  in rockchip_pwm_enable()
181 		clk_disable(pc->clk);  in rockchip_pwm_enable()
186 static int rockchip_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in rockchip_pwm_apply()  argument
194 	ret = clk_enable(pc->pclk);  in rockchip_pwm_apply()
198 	ret = clk_enable(pc->clk);  in rockchip_pwm_apply()
202 	pwm_get_state(pwm, &curstate);  in rockchip_pwm_apply()
205 	if (state->polarity != curstate.polarity && enabled &&  in rockchip_pwm_apply()
206 	    !pc->data->supports_lock) {  in rockchip_pwm_apply()
207 		ret = rockchip_pwm_enable(chip, pwm, false);  in rockchip_pwm_apply()
213 	rockchip_pwm_config(chip, pwm, state);  in rockchip_pwm_apply()
214 	if (state->enabled != enabled) {  in rockchip_pwm_apply()
215 		ret = rockchip_pwm_enable(chip, pwm, state->enabled);  in rockchip_pwm_apply()
221 	clk_disable(pc->clk);  in rockchip_pwm_apply()
222 	clk_disable(pc->pclk);  in rockchip_pwm_apply()
288 	{ .compatible = "rockchip,rk2928-pwm", .data = &pwm_data_v1},
289 	{ .compatible = "rockchip,rk3288-pwm", .data = &pwm_data_v2},
290 	{ .compatible = "rockchip,vop-pwm", .data = &pwm_data_vop},
291 	{ .compatible = "rockchip,rk3328-pwm", .data = &pwm_data_v3},
304 	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*pc));  in rockchip_pwm_probe()
309 	pc->base = devm_platform_ioremap_resource(pdev, 0);  in rockchip_pwm_probe()
310 	if (IS_ERR(pc->base))  in rockchip_pwm_probe()
311 		return PTR_ERR(pc->base);  in rockchip_pwm_probe()
313 	pc->clk = devm_clk_get(&pdev->dev, "pwm");  in rockchip_pwm_probe()
314 	if (IS_ERR(pc->clk)) {  in rockchip_pwm_probe()
315 		pc->clk = devm_clk_get(&pdev->dev, NULL);  in rockchip_pwm_probe()
316 		if (IS_ERR(pc->clk))  in rockchip_pwm_probe()
317 			return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk),  in rockchip_pwm_probe()
318 					     "Can't get PWM clk\n");  in rockchip_pwm_probe()
321 	count = of_count_phandle_with_args(pdev->dev.of_node,  in rockchip_pwm_probe()
322 					   "clocks", "#clock-cells");  in rockchip_pwm_probe()
324 		pc->pclk = devm_clk_get(&pdev->dev, "pclk");  in rockchip_pwm_probe()
326 		pc->pclk = pc->clk;  in rockchip_pwm_probe()
328 	if (IS_ERR(pc->pclk))  in rockchip_pwm_probe()
329 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->pclk), "Can't get APB clk\n");  in rockchip_pwm_probe()
331 	ret = clk_prepare_enable(pc->clk);  in rockchip_pwm_probe()
333 		return dev_err_probe(&pdev->dev, ret, "Can't prepare enable PWM clk\n");  in rockchip_pwm_probe()
335 	ret = clk_prepare_enable(pc->pclk);  in rockchip_pwm_probe()
337 		dev_err_probe(&pdev->dev, ret, "Can't prepare enable APB clk\n");  in rockchip_pwm_probe()
343 	pc->data = device_get_match_data(&pdev->dev);  in rockchip_pwm_probe()
344 	chip->ops = &rockchip_pwm_ops;  in rockchip_pwm_probe()
346 	enable_conf = pc->data->enable_conf;  in rockchip_pwm_probe()
347 	ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl);  in rockchip_pwm_probe()
352 		dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");  in rockchip_pwm_probe()
356 	/* Keep the PWM clk enabled if the PWM appears to be up and running. */  in rockchip_pwm_probe()
358 		clk_disable(pc->clk);  in rockchip_pwm_probe()
360 	clk_disable(pc->pclk);  in rockchip_pwm_probe()
365 	clk_disable_unprepare(pc->pclk);  in rockchip_pwm_probe()
367 	clk_disable_unprepare(pc->clk);  in rockchip_pwm_probe()
379 	clk_unprepare(pc->pclk);  in rockchip_pwm_remove()
380 	clk_unprepare(pc->clk);  in rockchip_pwm_remove()
385 		.name = "rockchip-pwm",
394 MODULE_DESCRIPTION("Rockchip SoC PWM driver");