mirror of
https://github.com/AsahiLinux/u-boot
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0e23fd81a5
Add a simple driver which implements the standard PWM uclass interface. Signed-off-by: Simon Glass <sjg@chromium.org>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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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 <pwm.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/cru_rk3288.h>
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#include <asm/arch/grf_rk3288.h>
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#include <asm/arch/pwm.h>
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#include <power/regulator.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct rk_pwm_priv {
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struct rk3288_pwm *regs;
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struct rk3288_grf *grf;
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};
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static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
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uint duty_ns)
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{
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struct rk_pwm_priv *priv = dev_get_priv(dev);
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struct rk3288_pwm *regs = priv->regs;
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unsigned long period, duty;
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debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
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writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
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PWM_CONTINUOUS | PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE |
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RK_PWM_DISABLE,
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®s->ctrl);
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period = lldiv((uint64_t)(PD_BUS_PCLK_HZ / 1000) * period_ns, 1000000);
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duty = lldiv((uint64_t)(PD_BUS_PCLK_HZ / 1000) * duty_ns, 1000000);
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writel(period, ®s->period_hpr);
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writel(duty, ®s->duty_lpr);
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debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
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return 0;
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}
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static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
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{
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struct rk_pwm_priv *priv = dev_get_priv(dev);
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struct rk3288_pwm *regs = priv->regs;
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debug("%s: Enable '%s'\n", __func__, dev->name);
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clrsetbits_le32(®s->ctrl, RK_PWM_ENABLE, enable ? RK_PWM_ENABLE : 0);
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return 0;
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}
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static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
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{
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struct rk_pwm_priv *priv = dev_get_priv(dev);
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struct regmap *map;
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priv->regs = (struct rk3288_pwm *)dev_get_addr(dev);
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map = syscon_get_regmap_by_driver_data(ROCKCHIP_SYSCON_GRF);
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if (IS_ERR(map))
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return PTR_ERR(map);
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priv->grf = regmap_get_range(map, 0);
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return 0;
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}
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static int rk_pwm_probe(struct udevice *dev)
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{
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struct rk_pwm_priv *priv = dev_get_priv(dev);
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rk_setreg(&priv->grf->soc_con2, 1 << 0);
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return 0;
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}
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static const struct pwm_ops rk_pwm_ops = {
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.set_config = rk_pwm_set_config,
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.set_enable = rk_pwm_set_enable,
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};
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static const struct udevice_id rk_pwm_ids[] = {
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{ .compatible = "rockchip,rk3288-pwm" },
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{ }
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};
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U_BOOT_DRIVER(rk_pwm) = {
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.name = "rk_pwm",
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.id = UCLASS_PWM,
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.of_match = rk_pwm_ids,
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.ops = &rk_pwm_ops,
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.ofdata_to_platdata = rk_pwm_ofdata_to_platdata,
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.probe = rk_pwm_probe,
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.priv_auto_alloc_size = sizeof(struct rk_pwm_priv),
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};
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