drivers/pwm/rk_pwm.c

   1 /*
   2  * Copyright (c) 2016 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.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/clock.h>
  16 #include <asm/arch/cru_rk3288.h>
  17 #include <asm/arch/grf_rk3288.h>
  18 #include <asm/arch/pwm.h>
  19 #include <power/regulator.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 struct rk_pwm_priv {
  24         struct rk3288_pwm *regs;
  25         struct rk3288_grf *grf;
  26 };
  27
  28 static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
  29                              uint duty_ns)
  30 {
  31         struct rk_pwm_priv *priv = dev_get_priv(dev);
  32         struct rk3288_pwm *regs = priv->regs;
  33         unsigned long period, duty;
  34
  35         debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
  36         writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
  37                 PWM_CONTINUOUS | PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE |
  38                 RK_PWM_DISABLE,
  39                 &regs->ctrl);
  40
  41         period = lldiv((uint64_t)(PD_BUS_PCLK_HZ / 1000) * period_ns, 1000000);
  42         duty = lldiv((uint64_t)(PD_BUS_PCLK_HZ / 1000) * duty_ns, 1000000);
  43
  44         writel(period, &regs->period_hpr);
  45         writel(duty, &regs->duty_lpr);
  46         debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
  47
  48         return 0;
  49 }
  50
  51 static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
  52 {
  53         struct rk_pwm_priv *priv = dev_get_priv(dev);
  54         struct rk3288_pwm *regs = priv->regs;
  55
  56         debug("%s: Enable '%s'\n", __func__, dev->name);
  57         clrsetbits_le32(&regs->ctrl, RK_PWM_ENABLE, enable ? RK_PWM_ENABLE : 0);
  58
  59         return 0;
  60 }
  61
  62 static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
  63 {
  64         struct rk_pwm_priv *priv = dev_get_priv(dev);
  65         struct regmap *map;
  66
  67         priv->regs = (struct rk3288_pwm *)dev_get_addr(dev);
  68         map = syscon_get_regmap_by_driver_data(ROCKCHIP_SYSCON_GRF);
  69         if (IS_ERR(map))
  70                 return PTR_ERR(map);
  71         priv->grf = regmap_get_range(map, 0);
  72
  73         return 0;
  74 }
  75
  76 static int rk_pwm_probe(struct udevice *dev)
  77 {
  78         struct rk_pwm_priv *priv = dev_get_priv(dev);
  79
  80         rk_setreg(&priv->grf->soc_con2, 1 << 0);
  81
  82         return 0;
  83 }
  84
  85 static const struct pwm_ops rk_pwm_ops = {
  86         .set_config     = rk_pwm_set_config,
  87         .set_enable     = rk_pwm_set_enable,
  88 };
  89
  90 static const struct udevice_id rk_pwm_ids[] = {
  91         { .compatible = "rockchip,rk3288-pwm" },
  92         { }
  93 };
  94
  95 U_BOOT_DRIVER(rk_pwm) = {
  96         .name   = "rk_pwm",
  97         .id     = UCLASS_PWM,
  98         .of_match = rk_pwm_ids,
  99         .ops    = &rk_pwm_ops,
 100         .ofdata_to_platdata     = rk_pwm_ofdata_to_platdata,
 101         .probe          = rk_pwm_probe,
 102         .priv_auto_alloc_size   = sizeof(struct rk_pwm_priv),
 103 };