1 // SPDX-License-Identifier: GPL-2.0+
4 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
6 * Basic support for the pwm module on imx6.
13 #include <asm/arch/imx-regs.h>
15 #include "pwm-imx-util.h"
17 int pwm_init(int pwm_id, int div, int invert)
19 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
28 int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles,
29 unsigned long duty_cycles, unsigned long prescale)
34 cr = PWMCR_PRESCALER(prescale) |
35 PWMCR_DOZEEN | PWMCR_WAITEN |
36 PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
40 writel(duty_cycles, &pwm->sar);
41 /* set period cycles */
42 writel(period_cycles, &pwm->pr);
46 int pwm_config(int pwm_id, int duty_ns, int period_ns)
48 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
49 unsigned long period_cycles, duty_cycles, prescale;
54 pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
57 return pwm_config_internal(pwm, period_cycles, duty_cycles, prescale);
60 int pwm_enable(int pwm_id)
62 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
67 setbits_le32(&pwm->cr, PWMCR_EN);
71 void pwm_disable(int pwm_id)
73 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
78 clrbits_le32(&pwm->cr, PWMCR_EN);
81 #if defined(CONFIG_DM_PWM)
83 struct pwm_regs *regs;
87 static int imx_pwm_set_invert(struct udevice *dev, uint channel,
90 struct imx_pwm_priv *priv = dev_get_priv(dev);
92 debug("%s: polarity=%u\n", __func__, polarity);
93 priv->invert = polarity;
98 static int imx_pwm_set_config(struct udevice *dev, uint channel,
99 uint period_ns, uint duty_ns)
101 struct imx_pwm_priv *priv = dev_get_priv(dev);
102 struct pwm_regs *regs = priv->regs;
103 unsigned long period_cycles, duty_cycles, prescale;
105 debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel);
107 pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
110 return pwm_config_internal(regs, period_cycles, duty_cycles, prescale);
113 static int imx_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
115 struct imx_pwm_priv *priv = dev_get_priv(dev);
116 struct pwm_regs *regs = priv->regs;
118 debug("%s: Enable '%s' state: %d\n", __func__, dev->name, enable);
121 setbits_le32(®s->cr, PWMCR_EN);
123 clrbits_le32(®s->cr, PWMCR_EN);
128 static int imx_pwm_ofdata_to_platdata(struct udevice *dev)
130 struct imx_pwm_priv *priv = dev_get_priv(dev);
132 priv->regs = (struct pwm_regs *)devfdt_get_addr(dev);
137 static int imx_pwm_probe(struct udevice *dev)
142 static const struct pwm_ops imx_pwm_ops = {
143 .set_invert = imx_pwm_set_invert,
144 .set_config = imx_pwm_set_config,
145 .set_enable = imx_pwm_set_enable,
148 static const struct udevice_id imx_pwm_ids[] = {
149 { .compatible = "fsl,imx27-pwm" },
153 U_BOOT_DRIVER(imx_pwm) = {
156 .of_match = imx_pwm_ids,
158 .ofdata_to_platdata = imx_pwm_ofdata_to_platdata,
159 .probe = imx_pwm_probe,
160 .priv_auto_alloc_size = sizeof(struct imx_pwm_priv),