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 <clock_legacy.h>
  10 #include <malloc.h>
  11 #include <asm/global_data.h>
  12 #include <asm/io.h>
  13 #include <dm.h>
  14 #include <clk.h>
  15 #include <timer.h>
  16 #include <linux/bitops.h>
  17
  18 #define OSTM_CMP        0x00
  19 #define OSTM_CNT        0x04
  20 #define OSTM_TE         0x10
  21 #define OSTM_TS         0x14
  22 #define OSTM_TT         0x18
  23 #define OSTM_CTL        0x20
  24 #define OSTM_CTL_D      BIT(1)
  25
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 struct ostm_priv {
  29         fdt_addr_t      regs;
  30 };
  31
  32 static u64 ostm_get_count(struct udevice *dev)
  33 {
  34         struct ostm_priv *priv = dev_get_priv(dev);
  35
  36         return timer_conv_64(readl(priv->regs + OSTM_CNT));
  37 }
  38
  39 static int ostm_probe(struct udevice *dev)
  40 {
  41         struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  42         struct ostm_priv *priv = dev_get_priv(dev);
  43 #if CONFIG_IS_ENABLED(CLK)
  44         struct clk clk;
  45         int ret;
  46
  47         ret = clk_get_by_index(dev, 0, &clk);
  48         if (ret)
  49                 return ret;
  50
  51         uc_priv->clock_rate = clk_get_rate(&clk);
  52
  53         clk_free(&clk);
  54 #else
  55         uc_priv->clock_rate = get_board_sys_clk() / 2;
  56 #endif
  57
  58         readb(priv->regs + OSTM_CTL);
  59         writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
  60
  61         setbits_8(priv->regs + OSTM_TT, BIT(0));
  62         writel(0xffffffff, priv->regs + OSTM_CMP);
  63         setbits_8(priv->regs + OSTM_TS, BIT(0));
  64
  65         return 0;
  66 }
  67
  68 static int ostm_of_to_plat(struct udevice *dev)
  69 {
  70         struct ostm_priv *priv = dev_get_priv(dev);
  71
  72         priv->regs = dev_read_addr(dev);
  73
  74         return 0;
  75 }
  76
  77 static const struct timer_ops ostm_ops = {
  78         .get_count      = ostm_get_count,
  79 };
  80
  81 static const struct udevice_id ostm_ids[] = {
  82         { .compatible = "renesas,ostm" },
  83         {}
  84 };
  85
  86 U_BOOT_DRIVER(ostm_timer) = {
  87         .name           = "ostm-timer",
  88         .id             = UCLASS_TIMER,
  89         .ops            = &ostm_ops,
  90         .probe          = ostm_probe,
  91         .of_match       = ostm_ids,
  92         .of_to_plat = ostm_of_to_plat,
  93         .priv_auto      = sizeof(struct ostm_priv),
  94 };