drivers/pwm/pwm-sifive.c

62 	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
64 	mutex_lock(&ddata->lock);
65 	ddata->user_count++;
66 	mutex_unlock(&ddata->lock);
73 	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
75 	mutex_lock(&ddata->lock);
76 	ddata->user_count--;
77 	mutex_unlock(&ddata->lock);
80 /* Called holding ddata->lock */
81 static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata,
95 	scale_pow = div64_ul(ddata->approx_period * (u64)rate, NSEC_PER_SEC);
100 	writel(val, ddata->regs + PWM_SIFIVE_PWMCFG);
104 	ddata->real_period = div64_ul(num, rate);
105 	dev_dbg(ddata->parent,
106 		"New real_period = %u ns\n", ddata->real_period);
112 	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
115 	duty = readl(ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
119 	val = readl(ddata->regs + PWM_SIFIVE_PWMCFG);
123 	state->period = ddata->real_period;
125 		(u64)duty * ddata->real_period >> PWM_SIFIVE_CMPWIDTH;
134 	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
163 	mutex_lock(&ddata->lock);
164 	if (state->period != ddata->approx_period) {
171 		if (ddata->user_count != 1 && ddata->approx_period) {
172 			mutex_unlock(&ddata->lock);
175 		ddata->approx_period = state->period;
176 		pwm_sifive_update_clock(ddata, clk_get_rate(ddata->clk));
178 	mutex_unlock(&ddata->lock);
186 		ret = clk_enable(ddata->clk);
193 	writel(frac, ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
196 		clk_disable(ddata->clk);
212 	struct pwm_sifive_ddata *ddata =
216 		mutex_lock(&ddata->lock);
217 		pwm_sifive_update_clock(ddata, ndata->new_rate);
218 		mutex_unlock(&ddata->lock);
227 	struct pwm_sifive_ddata *ddata;
233 	chip = devm_pwmchip_alloc(dev, 4, sizeof(*ddata));
237 	ddata = pwm_sifive_chip_to_ddata(chip);
238 	ddata->parent = dev;
239 	mutex_init(&ddata->lock);
242 	ddata->regs = devm_platform_ioremap_resource(pdev, 0);
243 	if (IS_ERR(ddata->regs))
244 		return PTR_ERR(ddata->regs);
246 	ddata->clk = devm_clk_get_prepared(dev, NULL);
247 	if (IS_ERR(ddata->clk))
248 		return dev_err_probe(dev, PTR_ERR(ddata->clk),
251 	ret = clk_enable(ddata->clk);
257 	val = readl(ddata->regs + PWM_SIFIVE_PWMCFG);
262 			val = readl(ddata->regs + PWM_SIFIVE_PWMCMP(i));
272 			ret = clk_enable(ddata->clk);
280 		clk_disable(ddata->clk);
285 	ddata->notifier.notifier_call = pwm_sifive_clock_notifier;
286 	ret = clk_notifier_register(ddata->clk, &ddata->notifier);
304 	clk_notifier_unregister(ddata->clk, &ddata->notifier);
307 		clk_disable(ddata->clk);
317 	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
322 	clk_notifier_unregister(ddata->clk, &ddata->notifier);
327 			clk_disable(ddata->clk);