1 // SPDX-License-Identifier: GPL-2.0-only
3  * drivers/pwm/pwm-pxa.c
5  * simple driver for PWM (Pulse Width Modulator) controller
7  * 2008-02-13	initial version
18 #include <linux/pwm.h>
26 	/*   PWM    has_secondary_pwm? */
27 	{ "pxa25x-pwm", 0 },
28 	{ "pxa27x-pwm", HAS_SECONDARY_PWM },
29 	{ "pxa168-pwm", 0 },
30 	{ "pxa910-pwm", 0 },
35 /* PWM registers and bits definitions */
60 static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in pxa_pwm_config()  argument
69 	offset = pwm->hwpwm ? 0x10 : 0;  in pxa_pwm_config()
71 	c = clk_get_rate(pc->clk);  in pxa_pwm_config()
78 	prescale = (period_cycles - 1) / 1024;  in pxa_pwm_config()
79 	pv = period_cycles / (prescale + 1) - 1;  in pxa_pwm_config()
82 		return -EINVAL;  in pxa_pwm_config()
89 	/* NOTE: the clock to PWM has to be enabled first  in pxa_pwm_config()
92 	rc = clk_prepare_enable(pc->clk);  in pxa_pwm_config()
96 	writel(prescale, pc->mmio_base + offset + PWMCR);  in pxa_pwm_config()
97 	writel(dc, pc->mmio_base + offset + PWMDCR);  in pxa_pwm_config()
98 	writel(pv, pc->mmio_base + offset + PWMPCR);  in pxa_pwm_config()
100 	clk_disable_unprepare(pc->clk);  in pxa_pwm_config()
104 static int pxa_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in pxa_pwm_enable()  argument
108 	return clk_prepare_enable(pc->clk);  in pxa_pwm_enable()
111 static void pxa_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)  in pxa_pwm_disable()  argument
115 	clk_disable_unprepare(pc->clk);  in pxa_pwm_disable()
127  * Device tree users must create one device instance for each PWM channel.
129  * code that this is a single channel pxa25x-pwm.  Currently all devices are
133 	{ .compatible = "marvell,pxa250-pwm", .data = &pwm_id_table[0]},
134 	{ .compatible = "marvell,pxa270-pwm", .data = &pwm_id_table[0]},
135 	{ .compatible = "marvell,pxa168-pwm", .data = &pwm_id_table[0]},
136 	{ .compatible = "marvell,pxa910-pwm", .data = &pwm_id_table[0]},
148 	return id ? id->data : NULL;  in pxa_pwm_get_id_dt()
154 	struct pwm_device *pwm;  in pxa_pwm_of_xlate()  local
156 	pwm = pwm_request_from_chip(pc, 0, NULL);  in pxa_pwm_of_xlate()
157 	if (IS_ERR(pwm))  in pxa_pwm_of_xlate()
158 		return pwm;  in pxa_pwm_of_xlate()
160 	pwm->args.period = args->args[0];  in pxa_pwm_of_xlate()
162 	return pwm;  in pxa_pwm_of_xlate()
168 	struct pxa_pwm_chip *pwm;  in pwm_probe()  local
173 		id = pxa_pwm_get_id_dt(&pdev->dev);  in pwm_probe()
176 		return -EINVAL;  in pwm_probe()
178 	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);  in pwm_probe()
179 	if (pwm == NULL)  in pwm_probe()
180 		return -ENOMEM;  in pwm_probe()
182 	pwm->clk = devm_clk_get(&pdev->dev, NULL);  in pwm_probe()
183 	if (IS_ERR(pwm->clk))  in pwm_probe()
184 		return PTR_ERR(pwm->clk);  in pwm_probe()
186 	pwm->chip.dev = &pdev->dev;  in pwm_probe()
187 	pwm->chip.ops = &pxa_pwm_ops;  in pwm_probe()
188 	pwm->chip.base = -1;  in pwm_probe()
189 	pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;  in pwm_probe()
192 		pwm->chip.of_xlate = pxa_pwm_of_xlate;  in pwm_probe()
193 		pwm->chip.of_pwm_n_cells = 1;  in pwm_probe()
197 	pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r);  in pwm_probe()
198 	if (IS_ERR(pwm->mmio_base))  in pwm_probe()
199 		return PTR_ERR(pwm->mmio_base);  in pwm_probe()
201 	ret = pwmchip_add(&pwm->chip);  in pwm_probe()
203 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);  in pwm_probe()
207 	platform_set_drvdata(pdev, pwm);  in pwm_probe()
217 		return -ENODEV;  in pwm_remove()
219 	return pwmchip_remove(&chip->chip);  in pwm_remove()
224 		.name	= "pxa25x-pwm",