1 // SPDX-License-Identifier: GPL-2.0
18 #include <linux/pwm.h>
22 /* PWM registers and bits definitions */
44  * struct pwm_mediatek_chip - struct representing PWM chip
45  * @regs: base address of PWM chip
47  * @clk_main: the clock used by PWM core
48  * @clk_pwms: the clock used by each PWM channel
74 				   struct pwm_device *pwm)  in pwm_mediatek_clk_enable()  argument
79 	ret = clk_prepare_enable(pc->clk_top);  in pwm_mediatek_clk_enable()
83 	ret = clk_prepare_enable(pc->clk_main);  in pwm_mediatek_clk_enable()
87 	ret = clk_prepare_enable(pc->clk_pwms[pwm->hwpwm]);  in pwm_mediatek_clk_enable()
94 	clk_disable_unprepare(pc->clk_main);  in pwm_mediatek_clk_enable()
96 	clk_disable_unprepare(pc->clk_top);  in pwm_mediatek_clk_enable()
102 				     struct pwm_device *pwm)  in pwm_mediatek_clk_disable()  argument
106 	clk_disable_unprepare(pc->clk_pwms[pwm->hwpwm]);  in pwm_mediatek_clk_disable()
107 	clk_disable_unprepare(pc->clk_main);  in pwm_mediatek_clk_disable()
108 	clk_disable_unprepare(pc->clk_top);  in pwm_mediatek_clk_disable()
112 				       unsigned int num, unsigned int offset,  in pwm_mediatek_writel()  argument
115 	writel(value, chip->regs + chip->soc->reg_offset[num] + offset);  in pwm_mediatek_writel()
118 static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,  in pwm_mediatek_config()  argument
127 	ret = pwm_mediatek_clk_enable(chip, pwm);  in pwm_mediatek_config()
133 	if (pc->soc->has_ck_26m_sel)  in pwm_mediatek_config()
134 		writel(0, pc->regs + PWM_CK_26M_SEL);  in pwm_mediatek_config()
138 	do_div(resolution, clk_get_rate(pc->clk_pwms[pwm->hwpwm]));  in pwm_mediatek_config()
149 		pwm_mediatek_clk_disable(chip, pwm);  in pwm_mediatek_config()
151 		return -EINVAL;  in pwm_mediatek_config()
154 	if (pc->soc->pwm45_fixup && pwm->hwpwm > 2) {  in pwm_mediatek_config()
156 		 * PWM[4,5] has distinct offset for PWMDWIDTH and PWMTHRES  in pwm_mediatek_config()
164 	pwm_mediatek_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);  in pwm_mediatek_config()
165 	pwm_mediatek_writel(pc, pwm->hwpwm, reg_width, cnt_period);  in pwm_mediatek_config()
166 	pwm_mediatek_writel(pc, pwm->hwpwm, reg_thres, cnt_duty);  in pwm_mediatek_config()
168 	pwm_mediatek_clk_disable(chip, pwm);  in pwm_mediatek_config()
173 static int pwm_mediatek_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in pwm_mediatek_enable()  argument
179 	ret = pwm_mediatek_clk_enable(chip, pwm);  in pwm_mediatek_enable()
183 	value = readl(pc->regs);  in pwm_mediatek_enable()
184 	value |= BIT(pwm->hwpwm);  in pwm_mediatek_enable()
185 	writel(value, pc->regs);  in pwm_mediatek_enable()
190 static void pwm_mediatek_disable(struct pwm_chip *chip, struct pwm_device *pwm)  in pwm_mediatek_disable()  argument
195 	value = readl(pc->regs);  in pwm_mediatek_disable()
196 	value &= ~BIT(pwm->hwpwm);  in pwm_mediatek_disable()
197 	writel(value, pc->regs);  in pwm_mediatek_disable()
199 	pwm_mediatek_clk_disable(chip, pwm);  in pwm_mediatek_disable()
202 static int pwm_mediatek_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in pwm_mediatek_apply()  argument
207 	if (state->polarity != PWM_POLARITY_NORMAL)  in pwm_mediatek_apply()
208 		return -EINVAL;  in pwm_mediatek_apply()
210 	if (!state->enabled) {  in pwm_mediatek_apply()
211 		if (pwm->state.enabled)  in pwm_mediatek_apply()
212 			pwm_mediatek_disable(chip, pwm);  in pwm_mediatek_apply()
217 	err = pwm_mediatek_config(chip, pwm, state->duty_cycle, state->period);  in pwm_mediatek_apply()
221 	if (!pwm->state.enabled)  in pwm_mediatek_apply()
222 		err = pwm_mediatek_enable(chip, pwm);  in pwm_mediatek_apply()
239 	soc = of_device_get_match_data(&pdev->dev);  in pwm_mediatek_probe()
241 	chip = devm_pwmchip_alloc(&pdev->dev, soc->num_pwms, sizeof(*pc));  in pwm_mediatek_probe()
246 	pc->soc = soc;  in pwm_mediatek_probe()
248 	pc->regs = devm_platform_ioremap_resource(pdev, 0);  in pwm_mediatek_probe()
249 	if (IS_ERR(pc->regs))  in pwm_mediatek_probe()
250 		return PTR_ERR(pc->regs);  in pwm_mediatek_probe()
252 	pc->clk_pwms = devm_kmalloc_array(&pdev->dev, soc->num_pwms,  in pwm_mediatek_probe()
253 				    sizeof(*pc->clk_pwms), GFP_KERNEL);  in pwm_mediatek_probe()
254 	if (!pc->clk_pwms)  in pwm_mediatek_probe()
255 		return -ENOMEM;  in pwm_mediatek_probe()
257 	pc->clk_top = devm_clk_get(&pdev->dev, "top");  in pwm_mediatek_probe()
258 	if (IS_ERR(pc->clk_top))  in pwm_mediatek_probe()
259 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_top),  in pwm_mediatek_probe()
262 	pc->clk_main = devm_clk_get(&pdev->dev, "main");  in pwm_mediatek_probe()
263 	if (IS_ERR(pc->clk_main))  in pwm_mediatek_probe()
264 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_main),  in pwm_mediatek_probe()
267 	for (i = 0; i < soc->num_pwms; i++) {  in pwm_mediatek_probe()
270 		snprintf(name, sizeof(name), "pwm%d", i + 1);  in pwm_mediatek_probe()
272 		pc->clk_pwms[i] = devm_clk_get(&pdev->dev, name);  in pwm_mediatek_probe()
273 		if (IS_ERR(pc->clk_pwms[i]))  in pwm_mediatek_probe()
274 			return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_pwms[i]),  in pwm_mediatek_probe()
278 	chip->ops = &pwm_mediatek_ops;  in pwm_mediatek_probe()
280 	ret = devm_pwmchip_add(&pdev->dev, chip);  in pwm_mediatek_probe()
282 		return dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");  in pwm_mediatek_probe()
372 	{ .compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data },
373 	{ .compatible = "mediatek,mt6795-pwm", .data = &mt6795_pwm_data },
374 	{ .compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data },
375 	{ .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
376 	{ .compatible = "mediatek,mt7628-pwm", .data = &mt7628_pwm_data },
377 	{ .compatible = "mediatek,mt7629-pwm", .data = &mt7629_pwm_data },
378 	{ .compatible = "mediatek,mt7981-pwm", .data = &mt7981_pwm_data },
379 	{ .compatible = "mediatek,mt7986-pwm", .data = &mt7986_pwm_data },
380 	{ .compatible = "mediatek,mt7988-pwm", .data = &mt7988_pwm_data },
381 	{ .compatible = "mediatek,mt8183-pwm", .data = &mt8183_pwm_data },
382 	{ .compatible = "mediatek,mt8365-pwm", .data = &mt8365_pwm_data },
383 	{ .compatible = "mediatek,mt8516-pwm", .data = &mt8516_pwm_data },
390 		.name = "pwm-mediatek",