// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2014 * Heiko Schocher, DENX Software Engineering, hs@denx.de. * * Basic support for the pwm module on imx6. */ #include #include #include #include #include #include #include #include "pwm-imx-util.h" int pwm_init(int pwm_id, int div, int invert) { struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); if (!pwm) return -1; writel(0, &pwm->ir); return 0; } int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles, unsigned long duty_cycles, unsigned long prescale) { u32 cr; writel(0, &pwm->ir); cr = PWMCR_PRESCALER(prescale) | PWMCR_DOZEEN | PWMCR_WAITEN | PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH; writel(cr, &pwm->cr); /* set duty cycles */ writel(duty_cycles, &pwm->sar); /* set period cycles */ writel(period_cycles, &pwm->pr); return 0; } int pwm_config(int pwm_id, int duty_ns, int period_ns) { struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); unsigned long period_cycles, duty_cycles, prescale; if (!pwm) return -1; pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, &prescale); return pwm_config_internal(pwm, period_cycles, duty_cycles, prescale); } int pwm_enable(int pwm_id) { struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); if (!pwm) return -1; setbits_le32(&pwm->cr, PWMCR_EN); return 0; } void pwm_disable(int pwm_id) { struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); if (!pwm) return; clrbits_le32(&pwm->cr, PWMCR_EN); } #if defined(CONFIG_DM_PWM) struct imx_pwm_priv { struct pwm_regs *regs; bool invert; }; static int imx_pwm_set_invert(struct udevice *dev, uint channel, bool polarity) { struct imx_pwm_priv *priv = dev_get_priv(dev); debug("%s: polarity=%u\n", __func__, polarity); priv->invert = polarity; return 0; } static int imx_pwm_set_config(struct udevice *dev, uint channel, uint period_ns, uint duty_ns) { struct imx_pwm_priv *priv = dev_get_priv(dev); struct pwm_regs *regs = priv->regs; unsigned long period_cycles, duty_cycles, prescale; debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel); pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, &prescale); return pwm_config_internal(regs, period_cycles, duty_cycles, prescale); }; static int imx_pwm_set_enable(struct udevice *dev, uint channel, bool enable) { struct imx_pwm_priv *priv = dev_get_priv(dev); struct pwm_regs *regs = priv->regs; debug("%s: Enable '%s' state: %d\n", __func__, dev->name, enable); if (enable) setbits_le32(®s->cr, PWMCR_EN); else clrbits_le32(®s->cr, PWMCR_EN); return 0; }; static int imx_pwm_ofdata_to_platdata(struct udevice *dev) { struct imx_pwm_priv *priv = dev_get_priv(dev); priv->regs = dev_read_addr_ptr(dev); return 0; } static int imx_pwm_probe(struct udevice *dev) { return 0; } static const struct pwm_ops imx_pwm_ops = { .set_invert = imx_pwm_set_invert, .set_config = imx_pwm_set_config, .set_enable = imx_pwm_set_enable, }; static const struct udevice_id imx_pwm_ids[] = { { .compatible = "fsl,imx27-pwm" }, { } }; U_BOOT_DRIVER(imx_pwm) = { .name = "imx_pwm", .id = UCLASS_PWM, .of_match = imx_pwm_ids, .ops = &imx_pwm_ops, .ofdata_to_platdata = imx_pwm_ofdata_to_platdata, .probe = imx_pwm_probe, .priv_auto_alloc_size = sizeof(struct imx_pwm_priv), }; #endif