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 	/* Enable all TCU channels for PWM use by default except channels 0/1 */  in jz4740_pwm_can_use_chn()
41 	u32 pwm_channels_mask = GENMASK(jz->chip.npwm - 1, 2);  in jz4740_pwm_can_use_chn()
43 	device_property_read_u32(jz->chip.dev->parent,  in jz4740_pwm_can_use_chn()
44 				 "ingenic,pwm-channels-mask",  in jz4740_pwm_can_use_chn()
57 	if (!jz4740_pwm_can_use_chn(jz, pwm->hwpwm))  in jz4740_pwm_request()
58 		return -EBUSY;  in jz4740_pwm_request()
60 	snprintf(name, sizeof(name), "timer%u", pwm->hwpwm);  in jz4740_pwm_request()
62 	clk = clk_get(chip->dev, name);  in jz4740_pwm_request()
64 		return dev_err_probe(chip->dev, PTR_ERR(clk),  in jz4740_pwm_request()
91 	regmap_update_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_enable()
95 	regmap_write(jz->map, TCU_REG_TESR, BIT(pwm->hwpwm));  in jz4740_pwm_enable()
105 	 * Set duty > period. This trick allows the TCU channels in TCU2 mode to  in jz4740_pwm_disable()
108 	regmap_write(jz->map, TCU_REG_TDHRc(pwm->hwpwm), 0xffff);  in jz4740_pwm_disable()
109 	regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), 0x0);  in jz4740_pwm_disable()
116 	regmap_update_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_disable()
120 	regmap_write(jz->map, TCU_REG_TECR, BIT(pwm->hwpwm));  in jz4740_pwm_disable()
126 	struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);  in jz4740_pwm_apply()
137 	do_div(tmp, state->period);  in jz4740_pwm_apply()
141 	 * -------------------  in jz4740_pwm_apply()
144 	 * happens to be true with the clk drivers used for Ingenic SoCs.  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()
152 		dev_err(chip->dev, "Unable to round rate: %ld", rate);  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()
173 		dev_err(chip->dev, "Unable to set rate: %d", err);  in jz4740_pwm_apply()
178 	regmap_write(jz4740->map, TCU_REG_TCNTc(pwm->hwpwm), 0);  in jz4740_pwm_apply()
181 	regmap_write(jz4740->map, TCU_REG_TDHRc(pwm->hwpwm), duty);  in jz4740_pwm_apply()
184 	regmap_write(jz4740->map, TCU_REG_TDFRc(pwm->hwpwm), period);  in jz4740_pwm_apply()
187 	regmap_update_bits(jz4740->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
195 	 * value. In theory, we should then use (period - duty) as the real duty  in jz4740_pwm_apply()
203 	if ((state->polarity == PWM_POLARITY_NORMAL) ^ state->enabled)  in jz4740_pwm_apply()
204 		regmap_update_bits(jz4740->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
207 		regmap_update_bits(jz4740->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
211 	if (state->enabled)  in jz4740_pwm_apply()
226 	struct device *dev = &pdev->dev;  in jz4740_pwm_probe()
232 		return -EINVAL;  in jz4740_pwm_probe()
236 		return -ENOMEM;  in jz4740_pwm_probe()
238 	jz4740->map = device_node_to_regmap(dev->parent->of_node);  in jz4740_pwm_probe()
239 	if (IS_ERR(jz4740->map)) {  in jz4740_pwm_probe()
240 		dev_err(dev, "regmap not found: %ld\n", PTR_ERR(jz4740->map));  in jz4740_pwm_probe()
241 		return PTR_ERR(jz4740->map);  in jz4740_pwm_probe()
244 	jz4740->chip.dev = dev;  in jz4740_pwm_probe()
245 	jz4740->chip.ops = &jz4740_pwm_ops;  in jz4740_pwm_probe()
246 	jz4740->chip.npwm = info->num_pwms;  in jz4740_pwm_probe()
247 	jz4740->chip.base = -1;  in jz4740_pwm_probe()
248 	jz4740->chip.of_xlate = of_pwm_xlate_with_flags;  in jz4740_pwm_probe()
249 	jz4740->chip.of_pwm_n_cells = 3;  in jz4740_pwm_probe()
253 	return pwmchip_add(&jz4740->chip);  in jz4740_pwm_probe()
260 	return pwmchip_remove(&jz4740->chip);  in jz4740_pwm_remove()
273 	{ .compatible = "ingenic,jz4740-pwm", .data = &jz4740_soc_info },
274 	{ .compatible = "ingenic,jz4725b-pwm", .data = &jz4725b_soc_info },
282 		.name = "jz4740-pwm",
290 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
291 MODULE_DESCRIPTION("Ingenic JZ4740 PWM driver");
292 MODULE_ALIAS("platform:jz4740-pwm");