drivers/pwm/rk_pwm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2016 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <div64.h>
  10 #include <dm.h>
  11 #include <pwm.h>
  12 #include <regmap.h>
  13 #include <syscon.h>
  14 #include <asm/io.h>
  15 #include <asm/arch/pwm.h>
  16 #include <power/regulator.h>
  17
  18 struct rk_pwm_priv {
  19         struct rk3288_pwm *regs;
  20         ulong freq;
  21         uint enable_conf;
  22 };
  23
  24 static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
  25 {
  26         struct rk_pwm_priv *priv = dev_get_priv(dev);
  27
  28         debug("%s: polarity=%u\n", __func__, polarity);
  29         priv->enable_conf &= ~(PWM_DUTY_MASK | PWM_INACTIVE_MASK);
  30         if (polarity)
  31                 priv->enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
  32         else
  33                 priv->enable_conf |= PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;
  34
  35         return 0;
  36 }
  37
  38 static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
  39                              uint duty_ns)
  40 {
  41         struct rk_pwm_priv *priv = dev_get_priv(dev);
  42         struct rk3288_pwm *regs = priv->regs;
  43         unsigned long period, duty;
  44
  45         debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
  46         writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
  47                 PWM_CONTINUOUS | priv->enable_conf |
  48                 RK_PWM_DISABLE,
  49                 &regs->ctrl);
  50
  51         period = lldiv((uint64_t)(priv->freq / 1000) * period_ns, 1000000);
  52         duty = lldiv((uint64_t)(priv->freq / 1000) * duty_ns, 1000000);
  53
  54         writel(period, &regs->period_hpr);
  55         writel(duty, &regs->duty_lpr);
  56         debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
  57
  58         return 0;
  59 }
  60
  61 static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
  62 {
  63         struct rk_pwm_priv *priv = dev_get_priv(dev);
  64         struct rk3288_pwm *regs = priv->regs;
  65
  66         debug("%s: Enable '%s'\n", __func__, dev->name);
  67         clrsetbits_le32(&regs->ctrl, RK_PWM_ENABLE, enable ? RK_PWM_ENABLE : 0);
  68
  69         return 0;
  70 }
  71
  72 static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
  73 {
  74         struct rk_pwm_priv *priv = dev_get_priv(dev);
  75
  76         priv->regs = (struct rk3288_pwm *)dev_read_addr(dev);
  77
  78         return 0;
  79 }
  80
  81 static int rk_pwm_probe(struct udevice *dev)
  82 {
  83         struct rk_pwm_priv *priv = dev_get_priv(dev);
  84         struct clk clk;
  85         int ret = 0;
  86
  87         ret = clk_get_by_index(dev, 0, &clk);
  88         if (ret < 0) {
  89                 debug("%s get clock fail!\n", __func__);
  90                 return -EINVAL;
  91         }
  92         priv->freq = clk_get_rate(&clk);
  93         priv->enable_conf = PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE;
  94
  95         return 0;
  96 }
  97
  98 static const struct pwm_ops rk_pwm_ops = {
  99         .set_invert     = rk_pwm_set_invert,
 100         .set_config     = rk_pwm_set_config,
 101         .set_enable     = rk_pwm_set_enable,
 102 };
 103
 104 static const struct udevice_id rk_pwm_ids[] = {
 105         { .compatible = "rockchip,rk3288-pwm" },
 106         { }
 107 };
 108
 109 U_BOOT_DRIVER(rk_pwm) = {
 110         .name   = "rk_pwm",
 111         .id     = UCLASS_PWM,
 112         .of_match = rk_pwm_ids,
 113         .ops    = &rk_pwm_ops,
 114         .ofdata_to_platdata     = rk_pwm_ofdata_to_platdata,
 115         .probe          = rk_pwm_probe,
 116         .priv_auto_alloc_size   = sizeof(struct rk_pwm_priv),
 117 };