drivers/timer/ostm_timer.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Renesas RZ/A1 R7S72100 OSTM Timer driver
   4  *
   5  * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <dm.h>
  11 #include <clk.h>
  12 #include <timer.h>
  13
  14 #define OSTM_CMP        0x00
  15 #define OSTM_CNT        0x04
  16 #define OSTM_TE         0x10
  17 #define OSTM_TS         0x14
  18 #define OSTM_TT         0x18
  19 #define OSTM_CTL        0x20
  20 #define OSTM_CTL_D      BIT(1)
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 struct ostm_priv {
  25         fdt_addr_t      regs;
  26 };
  27
  28 static int ostm_get_count(struct udevice *dev, u64 *count)
  29 {
  30         struct ostm_priv *priv = dev_get_priv(dev);
  31
  32         *count = timer_conv_64(readl(priv->regs + OSTM_CNT));
  33
  34         return 0;
  35 }
  36
  37 static int ostm_probe(struct udevice *dev)
  38 {
  39         struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  40         struct ostm_priv *priv = dev_get_priv(dev);
  41 #if CONFIG_IS_ENABLED(CLK)
  42         struct clk clk;
  43         int ret;
  44
  45         ret = clk_get_by_index(dev, 0, &clk);
  46         if (ret)
  47                 return ret;
  48
  49         uc_priv->clock_rate = clk_get_rate(&clk);
  50
  51         clk_free(&clk);
  52 #else
  53         uc_priv->clock_rate = CONFIG_SYS_CLK_FREQ / 2;
  54 #endif
  55
  56         readb(priv->regs + OSTM_CTL);
  57         writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
  58
  59         setbits_8(priv->regs + OSTM_TT, BIT(0));
  60         writel(0xffffffff, priv->regs + OSTM_CMP);
  61         setbits_8(priv->regs + OSTM_TS, BIT(0));
  62
  63         return 0;
  64 }
  65
  66 static int ostm_ofdata_to_platdata(struct udevice *dev)
  67 {
  68         struct ostm_priv *priv = dev_get_priv(dev);
  69
  70         priv->regs = dev_read_addr(dev);
  71
  72         return 0;
  73 }
  74
  75 static const struct timer_ops ostm_ops = {
  76         .get_count      = ostm_get_count,
  77 };
  78
  79 static const struct udevice_id ostm_ids[] = {
  80         { .compatible = "renesas,ostm" },
  81         {}
  82 };
  83
  84 U_BOOT_DRIVER(ostm_timer) = {
  85         .name           = "ostm-timer",
  86         .id             = UCLASS_TIMER,
  87         .ops            = &ostm_ops,
  88         .probe          = ostm_probe,
  89         .of_match       = ostm_ids,
  90         .ofdata_to_platdata = ostm_ofdata_to_platdata,
  91         .priv_auto_alloc_size = sizeof(struct ostm_priv),
  92 };