12 #include <linux/clk.h>
21 #include <linux/pwm.h>
27 /* PWM registers and bits definitions */
47  * struct spear_pwm_chip - struct representing pwm chip
49  * @mmio_base: base address of pwm chip
50  * @clk: pointer to clk structure of pwm chip
51  * @chip: linux pwm chip representation
55 	struct clk *clk;  member
67 	return readl_relaxed(chip->mmio_base + (num << 4) + offset);  in spear_pwm_readl()
74 	writel_relaxed(val, chip->mmio_base + (num << 4) + offset);  in spear_pwm_writel()
77 static int spear_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in spear_pwm_config()  argument
95 	clk_rate = clk_get_rate(pc->clk);  in spear_pwm_config()
106 			return -EINVAL;  in spear_pwm_config()
114 				return -EINVAL;  in spear_pwm_config()
121 	 * NOTE: the clock to PWM has to be enabled first before writing to the  in spear_pwm_config()
124 	ret = clk_enable(pc->clk);  in spear_pwm_config()
128 	spear_pwm_writel(pc, pwm->hwpwm, PWMCR,  in spear_pwm_config()
130 	spear_pwm_writel(pc, pwm->hwpwm, PWMDCR, dc);  in spear_pwm_config()
131 	spear_pwm_writel(pc, pwm->hwpwm, PWMPCR, pv);  in spear_pwm_config()
132 	clk_disable(pc->clk);  in spear_pwm_config()
137 static int spear_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in spear_pwm_enable()  argument
143 	rc = clk_enable(pc->clk);  in spear_pwm_enable()
147 	val = spear_pwm_readl(pc, pwm->hwpwm, PWMCR);  in spear_pwm_enable()
149 	spear_pwm_writel(pc, pwm->hwpwm, PWMCR, val);  in spear_pwm_enable()
154 static void spear_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)  in spear_pwm_disable()  argument
159 	val = spear_pwm_readl(pc, pwm->hwpwm, PWMCR);  in spear_pwm_disable()
161 	spear_pwm_writel(pc, pwm->hwpwm, PWMCR, val);  in spear_pwm_disable()
163 	clk_disable(pc->clk);  in spear_pwm_disable()
175 	struct device_node *np = pdev->dev.of_node;  in spear_pwm_probe()
181 	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);  in spear_pwm_probe()
183 		return -ENOMEM;  in spear_pwm_probe()
186 	pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);  in spear_pwm_probe()
187 	if (IS_ERR(pc->mmio_base))  in spear_pwm_probe()
188 		return PTR_ERR(pc->mmio_base);  in spear_pwm_probe()
190 	pc->clk = devm_clk_get(&pdev->dev, NULL);  in spear_pwm_probe()
191 	if (IS_ERR(pc->clk))  in spear_pwm_probe()
192 		return PTR_ERR(pc->clk);  in spear_pwm_probe()
196 	pc->chip.dev = &pdev->dev;  in spear_pwm_probe()
197 	pc->chip.ops = &spear_pwm_ops;  in spear_pwm_probe()
198 	pc->chip.base = -1;  in spear_pwm_probe()
199 	pc->chip.npwm = NUM_PWM;  in spear_pwm_probe()
201 	ret = clk_prepare(pc->clk);  in spear_pwm_probe()
205 	if (of_device_is_compatible(np, "st,spear1340-pwm")) {  in spear_pwm_probe()
206 		ret = clk_enable(pc->clk);  in spear_pwm_probe()
208 			clk_unprepare(pc->clk);  in spear_pwm_probe()
212 		 * Following enables PWM chip, channels would still be  in spear_pwm_probe()
215 		val = readl_relaxed(pc->mmio_base + PWMMCR);  in spear_pwm_probe()
217 		writel_relaxed(val, pc->mmio_base + PWMMCR);  in spear_pwm_probe()
219 		clk_disable(pc->clk);  in spear_pwm_probe()
222 	ret = pwmchip_add(&pc->chip);  in spear_pwm_probe()
224 		clk_unprepare(pc->clk);  in spear_pwm_probe()
225 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);  in spear_pwm_probe()
235 	/* clk was prepared in probe, hence unprepare it here */  in spear_pwm_remove()
236 	clk_unprepare(pc->clk);  in spear_pwm_remove()
237 	return pwmchip_remove(&pc->chip);  in spear_pwm_remove()
241 	{ .compatible = "st,spear320-pwm" },
242 	{ .compatible = "st,spear1340-pwm" },
250 		.name = "spear-pwm",
262 MODULE_ALIAS("platform:spear-pwm");