1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * ECAP PWM driver
5  * Copyright (C) 2012 Texas Instruments, Inc. - https://www.ti.com/
17 /* ECAP registers and bits definitions */
59 		return -ERANGE;  in ecap_pwm_config()
61 	c = pc->clk_rate;  in ecap_pwm_config()
70 		c = pc->clk_rate;  in ecap_pwm_config()
76 	pm_runtime_get_sync(pc->chip.dev);  in ecap_pwm_config()
78 	value = readw(pc->mmio_base + ECCTL2);  in ecap_pwm_config()
83 	writew(value, pc->mmio_base + ECCTL2);  in ecap_pwm_config()
87 		writel(duty_cycles, pc->mmio_base + CAP2);  in ecap_pwm_config()
88 		writel(period_cycles, pc->mmio_base + CAP1);  in ecap_pwm_config()
95 		writel(duty_cycles, pc->mmio_base + CAP4);  in ecap_pwm_config()
96 		writel(period_cycles, pc->mmio_base + CAP3);  in ecap_pwm_config()
100 		value = readw(pc->mmio_base + ECCTL2);  in ecap_pwm_config()
103 		writew(value, pc->mmio_base + ECCTL2);  in ecap_pwm_config()
106 	pm_runtime_put_sync(pc->chip.dev);  in ecap_pwm_config()
117 	pm_runtime_get_sync(pc->chip.dev);  in ecap_pwm_set_polarity()
119 	value = readw(pc->mmio_base + ECCTL2);  in ecap_pwm_set_polarity()
128 	writew(value, pc->mmio_base + ECCTL2);  in ecap_pwm_set_polarity()
130 	pm_runtime_put_sync(pc->chip.dev);  in ecap_pwm_set_polarity()
141 	pm_runtime_get_sync(pc->chip.dev);  in ecap_pwm_enable()
147 	value = readw(pc->mmio_base + ECCTL2);  in ecap_pwm_enable()
149 	writew(value, pc->mmio_base + ECCTL2);  in ecap_pwm_enable()
163 	value = readw(pc->mmio_base + ECCTL2);  in ecap_pwm_disable()
165 	writew(value, pc->mmio_base + ECCTL2);  in ecap_pwm_disable()
168 	pm_runtime_put_sync(pc->chip.dev);  in ecap_pwm_disable()
174 		dev_warn(chip->dev, "Removing PWM device without disabling\n");  in ecap_pwm_free()
175 		pm_runtime_put_sync(chip->dev);  in ecap_pwm_free()
189 	{ .compatible	= "ti,am3352-ecap" },
190 	{ .compatible	= "ti,am33xx-ecap" },
197 	struct device_node *np = pdev->dev.of_node;  in ecap_pwm_probe()
203 	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);  in ecap_pwm_probe()
205 		return -ENOMEM;  in ecap_pwm_probe()
207 	clk = devm_clk_get(&pdev->dev, "fck");  in ecap_pwm_probe()
209 		if (of_device_is_compatible(np, "ti,am33xx-ecap")) {  in ecap_pwm_probe()
210 			dev_warn(&pdev->dev, "Binding is obsolete.\n");  in ecap_pwm_probe()
211 			clk = devm_clk_get(pdev->dev.parent, "fck");  in ecap_pwm_probe()
216 		dev_err(&pdev->dev, "failed to get clock\n");  in ecap_pwm_probe()
220 	pc->clk_rate = clk_get_rate(clk);  in ecap_pwm_probe()
221 	if (!pc->clk_rate) {  in ecap_pwm_probe()
222 		dev_err(&pdev->dev, "failed to get clock rate\n");  in ecap_pwm_probe()
223 		return -EINVAL;  in ecap_pwm_probe()
226 	pc->chip.dev = &pdev->dev;  in ecap_pwm_probe()
227 	pc->chip.ops = &ecap_pwm_ops;  in ecap_pwm_probe()
228 	pc->chip.of_xlate = of_pwm_xlate_with_flags;  in ecap_pwm_probe()
229 	pc->chip.of_pwm_n_cells = 3;  in ecap_pwm_probe()
230 	pc->chip.base = -1;  in ecap_pwm_probe()
231 	pc->chip.npwm = 1;  in ecap_pwm_probe()
234 	pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);  in ecap_pwm_probe()
235 	if (IS_ERR(pc->mmio_base))  in ecap_pwm_probe()
236 		return PTR_ERR(pc->mmio_base);  in ecap_pwm_probe()
238 	ret = pwmchip_add(&pc->chip);  in ecap_pwm_probe()
240 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);  in ecap_pwm_probe()
245 	pm_runtime_enable(&pdev->dev);  in ecap_pwm_probe()
254 	pm_runtime_disable(&pdev->dev);  in ecap_pwm_remove()
256 	return pwmchip_remove(&pc->chip);  in ecap_pwm_remove()
262 	pm_runtime_get_sync(pc->chip.dev);  in ecap_pwm_save_context()
263 	pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);  in ecap_pwm_save_context()
264 	pc->ctx.cap4 = readl(pc->mmio_base + CAP4);  in ecap_pwm_save_context()
265 	pc->ctx.cap3 = readl(pc->mmio_base + CAP3);  in ecap_pwm_save_context()
266 	pm_runtime_put_sync(pc->chip.dev);  in ecap_pwm_save_context()
271 	writel(pc->ctx.cap3, pc->mmio_base + CAP3);  in ecap_pwm_restore_context()
272 	writel(pc->ctx.cap4, pc->mmio_base + CAP4);  in ecap_pwm_restore_context()
273 	writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);  in ecap_pwm_restore_context()
279 	struct pwm_device *pwm = pc->chip.pwms;  in ecap_pwm_suspend()
293 	struct pwm_device *pwm = pc->chip.pwms;  in ecap_pwm_resume()
308 		.name = "ecap",
317 MODULE_DESCRIPTION("ECAP PWM driver");