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