2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3  *  JZ4740 platform PWM support
23 #include <linux/pwm.h>
25 #include <asm/mach-jz4740/timer.h>
39 static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_request()  argument
45 	if (pwm->hwpwm < 2)  in jz4740_pwm_request()
46 		return -EBUSY;  in jz4740_pwm_request()
48 	jz4740_timer_start(pwm->hwpwm);  in jz4740_pwm_request()
53 static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_free()  argument
55 	jz4740_timer_set_ctrl(pwm->hwpwm, 0);  in jz4740_pwm_free()
57 	jz4740_timer_stop(pwm->hwpwm);  in jz4740_pwm_free()
60 static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_enable()  argument
62 	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);  in jz4740_pwm_enable()
65 	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);  in jz4740_pwm_enable()
66 	jz4740_timer_enable(pwm->hwpwm);  in jz4740_pwm_enable()
71 static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_disable()  argument
73 	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->hwpwm);  in jz4740_pwm_disable()
75 	/* Disable PWM output.  in jz4740_pwm_disable()
80 	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);  in jz4740_pwm_disable()
83 	jz4740_timer_disable(pwm->hwpwm);  in jz4740_pwm_disable()
86 static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in jz4740_pwm_config()  argument
89 	struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);  in jz4740_pwm_config()
96 	tmp = (unsigned long long)clk_get_rate(jz4740->clk) * period_ns;  in jz4740_pwm_config()
106 		return -EINVAL;  in jz4740_pwm_config()
110 	duty = period - tmp;  in jz4740_pwm_config()
113 		duty = period - 1;  in jz4740_pwm_config()
115 	is_enabled = jz4740_timer_is_enabled(pwm->hwpwm);  in jz4740_pwm_config()
117 		jz4740_pwm_disable(chip, pwm);  in jz4740_pwm_config()
119 	jz4740_timer_set_count(pwm->hwpwm, 0);  in jz4740_pwm_config()
120 	jz4740_timer_set_duty(pwm->hwpwm, duty);  in jz4740_pwm_config()
121 	jz4740_timer_set_period(pwm->hwpwm, period);  in jz4740_pwm_config()
126 	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);  in jz4740_pwm_config()
129 		jz4740_pwm_enable(chip, pwm);  in jz4740_pwm_config()
135 		struct pwm_device *pwm, enum pwm_polarity polarity)  in jz4740_pwm_set_polarity()  argument
137 	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);  in jz4740_pwm_set_polarity()
148 	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);  in jz4740_pwm_set_polarity()
166 	jz4740 = devm_kzalloc(&pdev->dev, sizeof(*jz4740), GFP_KERNEL);  in jz4740_pwm_probe()
168 		return -ENOMEM;  in jz4740_pwm_probe()
170 	jz4740->clk = devm_clk_get(&pdev->dev, "ext");  in jz4740_pwm_probe()
171 	if (IS_ERR(jz4740->clk))  in jz4740_pwm_probe()
172 		return PTR_ERR(jz4740->clk);  in jz4740_pwm_probe()
174 	jz4740->chip.dev = &pdev->dev;  in jz4740_pwm_probe()
175 	jz4740->chip.ops = &jz4740_pwm_ops;  in jz4740_pwm_probe()
176 	jz4740->chip.npwm = NUM_PWM;  in jz4740_pwm_probe()
177 	jz4740->chip.base = -1;  in jz4740_pwm_probe()
178 	jz4740->chip.of_xlate = of_pwm_xlate_with_flags;  in jz4740_pwm_probe()
179 	jz4740->chip.of_pwm_n_cells = 3;  in jz4740_pwm_probe()
183 	return pwmchip_add(&jz4740->chip);  in jz4740_pwm_probe()
190 	return pwmchip_remove(&jz4740->chip);  in jz4740_pwm_remove()
195 	{ .compatible = "ingenic,jz4740-pwm", },
196 	{ .compatible = "ingenic,jz4770-pwm", },
197 	{ .compatible = "ingenic,jz4780-pwm", },
205 		.name = "jz4740-pwm",
213 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
214 MODULE_DESCRIPTION("Ingenic JZ4740 PWM driver");
215 MODULE_ALIAS("platform:jz4740-pwm");