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https://github.com/AsahiLinux/u-boot
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163 lines
3.4 KiB
C
163 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2014
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* Heiko Schocher, DENX Software Engineering, hs@denx.de.
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*
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* Basic support for the pwm module on imx6.
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*/
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#include <common.h>
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#include <div64.h>
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#include <dm.h>
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#include <log.h>
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#include <pwm.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/io.h>
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#include "pwm-imx-util.h"
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int pwm_init(int pwm_id, int div, int invert)
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{
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struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
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if (!pwm)
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return -1;
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writel(0, &pwm->ir);
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return 0;
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}
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int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles,
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unsigned long duty_cycles, unsigned long prescale)
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{
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u32 cr;
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writel(0, &pwm->ir);
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cr = PWMCR_PRESCALER(prescale) |
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PWMCR_DOZEEN | PWMCR_WAITEN |
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PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
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writel(cr, &pwm->cr);
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/* set duty cycles */
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writel(duty_cycles, &pwm->sar);
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/* set period cycles */
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writel(period_cycles, &pwm->pr);
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return 0;
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}
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int pwm_config(int pwm_id, int duty_ns, int period_ns)
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{
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struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
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unsigned long period_cycles, duty_cycles, prescale;
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if (!pwm)
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return -1;
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pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
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&prescale);
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return pwm_config_internal(pwm, period_cycles, duty_cycles, prescale);
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}
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int pwm_enable(int pwm_id)
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{
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struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
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if (!pwm)
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return -1;
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setbits_le32(&pwm->cr, PWMCR_EN);
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return 0;
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}
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void pwm_disable(int pwm_id)
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{
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struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
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if (!pwm)
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return;
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clrbits_le32(&pwm->cr, PWMCR_EN);
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}
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#if defined(CONFIG_DM_PWM)
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struct imx_pwm_priv {
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struct pwm_regs *regs;
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bool invert;
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};
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static int imx_pwm_set_invert(struct udevice *dev, uint channel,
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bool polarity)
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{
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struct imx_pwm_priv *priv = dev_get_priv(dev);
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debug("%s: polarity=%u\n", __func__, polarity);
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priv->invert = polarity;
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return 0;
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}
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static int imx_pwm_set_config(struct udevice *dev, uint channel,
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uint period_ns, uint duty_ns)
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{
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struct imx_pwm_priv *priv = dev_get_priv(dev);
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struct pwm_regs *regs = priv->regs;
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unsigned long period_cycles, duty_cycles, prescale;
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debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel);
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pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
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&prescale);
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return pwm_config_internal(regs, period_cycles, duty_cycles, prescale);
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};
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static int imx_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
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{
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struct imx_pwm_priv *priv = dev_get_priv(dev);
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struct pwm_regs *regs = priv->regs;
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debug("%s: Enable '%s' state: %d\n", __func__, dev->name, enable);
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if (enable)
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setbits_le32(®s->cr, PWMCR_EN);
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else
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clrbits_le32(®s->cr, PWMCR_EN);
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return 0;
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};
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static int imx_pwm_ofdata_to_platdata(struct udevice *dev)
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{
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struct imx_pwm_priv *priv = dev_get_priv(dev);
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priv->regs = (struct pwm_regs *)devfdt_get_addr(dev);
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return 0;
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}
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static int imx_pwm_probe(struct udevice *dev)
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{
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return 0;
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}
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static const struct pwm_ops imx_pwm_ops = {
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.set_invert = imx_pwm_set_invert,
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.set_config = imx_pwm_set_config,
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.set_enable = imx_pwm_set_enable,
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};
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static const struct udevice_id imx_pwm_ids[] = {
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{ .compatible = "fsl,imx27-pwm" },
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{ }
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};
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U_BOOT_DRIVER(imx_pwm) = {
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.name = "imx_pwm",
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.id = UCLASS_PWM,
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.of_match = imx_pwm_ids,
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.ops = &imx_pwm_ops,
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.ofdata_to_platdata = imx_pwm_ofdata_to_platdata,
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.probe = imx_pwm_probe,
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.priv_auto_alloc_size = sizeof(struct imx_pwm_priv),
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};
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#endif
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