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.
14 #include <asm/arch/imx-regs.h>
16 #include "pwm-imx-util.h"
18 int pwm_init(int pwm_id, int div, int invert)
20 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
29 int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles,
30 unsigned long duty_cycles, unsigned long prescale)
35 cr = PWMCR_PRESCALER(prescale) |
36 PWMCR_DOZEEN | PWMCR_WAITEN |
37 PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
41 writel(duty_cycles, &pwm->sar);
42 /* set period cycles */
43 writel(period_cycles, &pwm->pr);
47 int pwm_config(int pwm_id, int duty_ns, int period_ns)
49 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
50 unsigned long period_cycles, duty_cycles, prescale;
55 pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
58 return pwm_config_internal(pwm, period_cycles, duty_cycles, prescale);
61 int pwm_enable(int pwm_id)
63 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
68 setbits_le32(&pwm->cr, PWMCR_EN);
72 void pwm_disable(int pwm_id)
74 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
79 clrbits_le32(&pwm->cr, PWMCR_EN);
82 #if defined(CONFIG_DM_PWM)
84 struct pwm_regs *regs;
88 static int imx_pwm_set_invert(struct udevice *dev, uint channel,
91 struct imx_pwm_priv *priv = dev_get_priv(dev);
93 debug("%s: polarity=%u\n", __func__, polarity);
94 priv->invert = polarity;
99 static int imx_pwm_set_config(struct udevice *dev, uint channel,
100 uint period_ns, uint duty_ns)
102 struct imx_pwm_priv *priv = dev_get_priv(dev);
103 struct pwm_regs *regs = priv->regs;
104 unsigned long period_cycles, duty_cycles, prescale;
106 debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel);
108 pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
111 return pwm_config_internal(regs, period_cycles, duty_cycles, prescale);
114 static int imx_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
116 struct imx_pwm_priv *priv = dev_get_priv(dev);
117 struct pwm_regs *regs = priv->regs;
119 debug("%s: Enable '%s' state: %d\n", __func__, dev->name, enable);
122 setbits_le32(®s->cr, PWMCR_EN);
124 clrbits_le32(®s->cr, PWMCR_EN);
129 static int imx_pwm_ofdata_to_platdata(struct udevice *dev)
131 struct imx_pwm_priv *priv = dev_get_priv(dev);
133 priv->regs = (struct pwm_regs *)devfdt_get_addr(dev);
138 static int imx_pwm_probe(struct udevice *dev)
143 static const struct pwm_ops imx_pwm_ops = {
144 .set_invert = imx_pwm_set_invert,
145 .set_config = imx_pwm_set_config,
146 .set_enable = imx_pwm_set_enable,
149 static const struct udevice_id imx_pwm_ids[] = {
150 { .compatible = "fsl,imx27-pwm" },
154 U_BOOT_DRIVER(imx_pwm) = {
157 .of_match = imx_pwm_ids,
159 .ofdata_to_platdata = imx_pwm_ofdata_to_platdata,
160 .probe = imx_pwm_probe,
161 .priv_auto_alloc_size = sizeof(struct imx_pwm_priv),