1 // SPDX-License-Identifier: GPL-2.0-only
3  * drivers/pwm/pwm-pxa.c
7  * 2008-02-13	initial version
27 	{ "pxa25x-pwm", 0 },
28 	{ "pxa27x-pwm", HAS_SECONDARY_PWM },
29 	{ "pxa168-pwm", 0 },
30 	{ "pxa910-pwm", 0 },
44 	struct pwm_chip	chip;  member
51 static inline struct pxa_pwm_chip *to_pxa_pwm_chip(struct pwm_chip *chip)  in to_pxa_pwm_chip()  argument
53 	return container_of(chip, struct pxa_pwm_chip, chip);  in to_pxa_pwm_chip()
60 static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in pxa_pwm_config()  argument
63 	struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);  in pxa_pwm_config()
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
106 	struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);  in pxa_pwm_enable()
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
113 	struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);  in pxa_pwm_disable()
115 	clk_disable_unprepare(pc->clk);  in pxa_pwm_disable()
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]},
146 	const struct of_device_id *id = of_match_device(pwm_of_match, dev);  in pxa_pwm_get_id_dt()  local
148 	return id ? id->data : NULL;  in pxa_pwm_get_id_dt()
160 	pwm->args.period = args->args[0];  in pxa_pwm_of_xlate()
167 	const struct platform_device_id *id = platform_get_device_id(pdev);  in pwm_probe()  local
171 	if (IS_ENABLED(CONFIG_OF) && id == NULL)  in pwm_probe()
172 		id = pxa_pwm_get_id_dt(&pdev->dev);  in pwm_probe()
174 	if (id == NULL)  in pwm_probe()
175 		return -EINVAL;  in pwm_probe()
177 	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);  in pwm_probe()
179 		return -ENOMEM;  in pwm_probe()
181 	pc->clk = devm_clk_get(&pdev->dev, NULL);  in pwm_probe()
182 	if (IS_ERR(pc->clk))  in pwm_probe()
183 		return PTR_ERR(pc->clk);  in pwm_probe()
185 	pc->chip.dev = &pdev->dev;  in pwm_probe()
186 	pc->chip.ops = &pxa_pwm_ops;  in pwm_probe()
187 	pc->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;  in pwm_probe()
190 		pc->chip.of_xlate = pxa_pwm_of_xlate;  in pwm_probe()
191 		pc->chip.of_pwm_n_cells = 1;  in pwm_probe()
194 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);  in pwm_probe()
195 	if (IS_ERR(pc->mmio_base))  in pwm_probe()
196 		return PTR_ERR(pc->mmio_base);  in pwm_probe()
198 	ret = devm_pwmchip_add(&pdev->dev, &pc->chip);  in pwm_probe()
200 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);  in pwm_probe()
209 		.name	= "pxa25x-pwm",