LXR uboot/drivers/timer/sifive_clint

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
   4 * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
   5 */
   6
   7#include <common.h>
   8#include <clk.h>
   9#include <dm.h>
  10#include <timer.h>
  11#include <asm/io.h>
  12#include <dm/device-internal.h>
  13#include <linux/err.h>
  14
  15/* mtime register */
  16#define MTIME_REG(base)                 ((ulong)(base) + 0xbff8)
  17
  18static u64 notrace sifive_clint_get_count(struct udevice *dev)
  19{
  20        return readq((void __iomem *)MTIME_REG(dev_get_priv(dev)));
  21}
  22
  23#if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY)
  24/**
  25 * timer_early_get_rate() - Get the timer rate before driver model
  26 */
  27unsigned long notrace timer_early_get_rate(void)
  28{
  29        return RISCV_MMODE_TIMER_FREQ;
  30}
  31
  32/**
  33 * timer_early_get_count() - Get the timer count before driver model
  34 *
  35 */
  36u64 notrace timer_early_get_count(void)
  37{
  38        return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE));
  39}
  40#endif
  41
  42static const struct timer_ops sifive_clint_ops = {
  43        .get_count = sifive_clint_get_count,
  44};
  45
  46static int sifive_clint_probe(struct udevice *dev)
  47{
  48        dev_set_priv(dev, dev_read_addr_ptr(dev));
  49        if (!dev_get_priv(dev))
  50                return -EINVAL;
  51
  52        return timer_timebase_fallback(dev);
  53}
  54
  55static const struct udevice_id sifive_clint_ids[] = {
  56        { .compatible = "riscv,clint0" },
  57        { .compatible = "sifive,clint0" },
  58        { }
  59};
  60
  61U_BOOT_DRIVER(sifive_clint) = {
  62        .name           = "sifive_clint",
  63        .id             = UCLASS_TIMER,
  64        .of_match       = sifive_clint_ids,
  65        .probe          = sifive_clint_probe,
  66        .ops            = &sifive_clint_ops,
  67        .flags          = DM_FLAG_PRE_RELOC,
  68};
  69