30  * 1) There is no disable bit and the hardware docs advise programming a zero
31  *    duty to achieve output equivalent to that of a normal disable operation.
85 	unsigned int value = readl(kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_prepare_for_settings()
89 	writel(value, kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_prepare_for_settings()
100 	unsigned int value = readl(kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_apply_settings()
105 	writel(value, kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_apply_settings()
116 	unsigned long prescale = PRESCALE_MIN, pc, dc;  in kona_pwmc_config()  local
117 	unsigned int value, chan = pwm->hwpwm;  in kona_pwmc_config()
124 	 * duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE  in kona_pwmc_config()
127 	 * DC = (PWM_CLK_RATE * duty_ns) / (10^9 * (PRESCALE + 1))  in kona_pwmc_config()
130 	rate = clk_get_rate(kp->clk);  in kona_pwmc_config()
138 		dc = div64_u64(val, div);  in kona_pwmc_config()
142 			return -EINVAL;  in kona_pwmc_config()
144 		/* If pc and dc are in bounds, the calculation is done */  in kona_pwmc_config()
145 		if (pc <= PERIOD_COUNT_MAX && dc <= DUTY_CYCLE_HIGH_MAX)  in kona_pwmc_config()
148 		/* Otherwise, increase prescale and recalculate pc and dc */  in kona_pwmc_config()
150 			return -EINVAL;  in kona_pwmc_config()
161 		value = readl(kp->base + PRESCALE_OFFSET);  in kona_pwmc_config()
164 		writel(value, kp->base + PRESCALE_OFFSET);  in kona_pwmc_config()
166 		writel(pc, kp->base + PERIOD_COUNT_OFFSET(chan));  in kona_pwmc_config()
168 		writel(dc, kp->base + DUTY_CYCLE_HIGH_OFFSET(chan));  in kona_pwmc_config()
180 	unsigned int chan = pwm->hwpwm;  in kona_pwmc_set_polarity()
184 	ret = clk_prepare_enable(kp->clk);  in kona_pwmc_set_polarity()
186 		dev_err(chip->dev, "failed to enable clock: %d\n", ret);  in kona_pwmc_set_polarity()
192 	value = readl(kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_set_polarity()
199 	writel(value, kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_set_polarity()
203 	clk_disable_unprepare(kp->clk);  in kona_pwmc_set_polarity()
213 	ret = clk_prepare_enable(kp->clk);  in kona_pwmc_enable()
215 		dev_err(chip->dev, "failed to enable clock: %d\n", ret);  in kona_pwmc_enable()
222 		clk_disable_unprepare(kp->clk);  in kona_pwmc_enable()
232 	unsigned int chan = pwm->hwpwm;  in kona_pwmc_disable()
237 	/* Simulate a disable by configuring for zero duty */  in kona_pwmc_disable()
238 	writel(0, kp->base + DUTY_CYCLE_HIGH_OFFSET(chan));  in kona_pwmc_disable()
239 	writel(0, kp->base + PERIOD_COUNT_OFFSET(chan));  in kona_pwmc_disable()
242 	value = readl(kp->base + PRESCALE_OFFSET);  in kona_pwmc_disable()
244 	writel(value, kp->base + PRESCALE_OFFSET);  in kona_pwmc_disable()
248 	clk_disable_unprepare(kp->clk);  in kona_pwmc_disable()
255 	.disable = kona_pwmc_disable,
267 	kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL);  in kona_pwmc_probe()
269 		return -ENOMEM;  in kona_pwmc_probe()
273 	kp->chip.dev = &pdev->dev;  in kona_pwmc_probe()
274 	kp->chip.ops = &kona_pwm_ops;  in kona_pwmc_probe()
275 	kp->chip.base = -1;  in kona_pwmc_probe()
276 	kp->chip.npwm = 6;  in kona_pwmc_probe()
277 	kp->chip.of_xlate = of_pwm_xlate_with_flags;  in kona_pwmc_probe()
278 	kp->chip.of_pwm_n_cells = 3;  in kona_pwmc_probe()
281 	kp->base = devm_ioremap_resource(&pdev->dev, res);  in kona_pwmc_probe()
282 	if (IS_ERR(kp->base))  in kona_pwmc_probe()
283 		return PTR_ERR(kp->base);  in kona_pwmc_probe()
285 	kp->clk = devm_clk_get(&pdev->dev, NULL);  in kona_pwmc_probe()
286 	if (IS_ERR(kp->clk)) {  in kona_pwmc_probe()
287 		dev_err(&pdev->dev, "failed to get clock: %ld\n",  in kona_pwmc_probe()
288 			PTR_ERR(kp->clk));  in kona_pwmc_probe()
289 		return PTR_ERR(kp->clk);  in kona_pwmc_probe()
292 	ret = clk_prepare_enable(kp->clk);  in kona_pwmc_probe()
294 		dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);  in kona_pwmc_probe()
299 	for (chan = 0; chan < kp->chip.npwm; chan++)  in kona_pwmc_probe()
302 	writel(value, kp->base + PWM_CONTROL_OFFSET);  in kona_pwmc_probe()
304 	clk_disable_unprepare(kp->clk);  in kona_pwmc_probe()
306 	ret = pwmchip_add_with_polarity(&kp->chip, PWM_POLARITY_INVERSED);  in kona_pwmc_probe()
308 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);  in kona_pwmc_probe()
318 	for (chan = 0; chan < kp->chip.npwm; chan++)  in kona_pwmc_remove()
319 		if (pwm_is_enabled(&kp->chip.pwms[chan]))  in kona_pwmc_remove()
320 			clk_disable_unprepare(kp->clk);  in kona_pwmc_remove()
322 	return pwmchip_remove(&kp->chip);  in kona_pwmc_remove()
326 	{ .compatible = "brcm,kona-pwm" },
333 		.name = "bcm-kona-pwm",
341 MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");