1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
7  * - The .apply callback doesn't complete the currently running period before
15 #include <linux/mfd/ingenic-tcu.h>
40 	u32 pwm_channels_mask = GENMASK(chip->npwm - 1, 2);  in jz4740_pwm_can_use_chn()
42 	device_property_read_u32(pwmchip_parent(chip)->parent,  in jz4740_pwm_can_use_chn()
43 				 "ingenic,pwm-channels-mask",  in jz4740_pwm_can_use_chn()
56 	if (!jz4740_pwm_can_use_chn(chip, pwm->hwpwm))  in jz4740_pwm_request()
57 		return -EBUSY;  in jz4740_pwm_request()
59 	snprintf(name, sizeof(name), "timer%u", pwm->hwpwm);  in jz4740_pwm_request()
74 	jz->clk[pwm->hwpwm] = clk;  in jz4740_pwm_request()
82 	struct clk *clk = jz->clk[pwm->hwpwm];  in jz4740_pwm_free()
92 	/* Enable PWM output */  in jz4740_pwm_enable()
93 	regmap_set_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm), TCU_TCSR_PWM_EN);  in jz4740_pwm_enable()
96 	regmap_write(jz->map, TCU_REG_TESR, BIT(pwm->hwpwm));  in jz4740_pwm_enable()
109 	regmap_write(jz->map, TCU_REG_TDHRc(pwm->hwpwm), 0xffff);  in jz4740_pwm_disable()
110 	regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), 0x0);  in jz4740_pwm_disable()
113 	 * Disable PWM output.  in jz4740_pwm_disable()
117 	regmap_clear_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm), TCU_TCSR_PWM_EN);  in jz4740_pwm_disable()
120 	regmap_write(jz->map, TCU_REG_TECR, BIT(pwm->hwpwm));  in jz4740_pwm_disable()
128 	struct clk *clk = jz->clk[pwm->hwpwm];  in jz4740_pwm_apply()
137 	do_div(tmp, state->period);  in jz4740_pwm_apply()
141 	 * -------------------  in jz4740_pwm_apply()
147 	 * round-down function (and won't have one for a while), but if it ever  in jz4740_pwm_apply()
148 	 * comes to light, a round-down function should be used instead.  in jz4740_pwm_apply()
157 	tmp = (unsigned long long)rate * state->period;  in jz4740_pwm_apply()
162 	tmp = (unsigned long long)rate * state->duty_cycle;  in jz4740_pwm_apply()
167 		duty = period - 1;  in jz4740_pwm_apply()
178 	regmap_write(jz->map, TCU_REG_TCNTc(pwm->hwpwm), 0);  in jz4740_pwm_apply()
181 	regmap_write(jz->map, TCU_REG_TDHRc(pwm->hwpwm), duty);  in jz4740_pwm_apply()
184 	regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), period);  in jz4740_pwm_apply()
187 	regmap_set_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
191 	 * Set polarity.  in jz4740_pwm_apply()
195 	 * value. In theory, we should then use (period - duty) as the real duty  in jz4740_pwm_apply()
199 	 * Here, we don't do that, and instead invert the polarity of the PWM  in jz4740_pwm_apply()
203 	if ((state->polarity == PWM_POLARITY_NORMAL) ^ state->enabled)  in jz4740_pwm_apply()
204 		regmap_clear_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
207 		regmap_set_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
210 	if (state->enabled)  in jz4740_pwm_apply()
224 	struct device *dev = &pdev->dev;  in jz4740_pwm_probe()
231 		return -EINVAL;  in jz4740_pwm_probe()
233 	chip = devm_pwmchip_alloc(dev, info->num_pwms, struct_size(jz, clk, info->num_pwms));  in jz4740_pwm_probe()
238 	jz->map = device_node_to_regmap(dev->parent->of_node);  in jz4740_pwm_probe()
239 	if (IS_ERR(jz->map)) {  in jz4740_pwm_probe()
240 		dev_err(dev, "regmap not found: %ld\n", PTR_ERR(jz->map));  in jz4740_pwm_probe()
241 		return PTR_ERR(jz->map);  in jz4740_pwm_probe()
244 	chip->ops = &jz4740_pwm_ops;  in jz4740_pwm_probe()
262 	{ .compatible = "ingenic,jz4740-pwm", .data = &jz4740_soc_info },
263 	{ .compatible = "ingenic,jz4725b-pwm", .data = &jz4725b_soc_info },
264 	{ .compatible = "ingenic,x1000-pwm", .data = &x1000_soc_info },
271 		.name = "jz4740-pwm",
278 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
280 MODULE_ALIAS("platform:jz4740-pwm");