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9c02e50fa1
Linux kernel commit a2770b57d083 ("dt-bindings: timer: Add CLINT bindings")
adds the official DT bindings for CLINT, which uses "sifive,clint0"
as the compatible string. "riscv,clint0" is now legacy and has to
be kept for backward compatibility of legacy systems.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <timer.h>
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#include <asm/io.h>
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#include <dm/device-internal.h>
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#include <linux/err.h>
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/* mtime register */
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#define MTIME_REG(base) ((ulong)(base) + 0xbff8)
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static u64 notrace sifive_clint_get_count(struct udevice *dev)
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{
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return readq((void __iomem *)MTIME_REG(dev_get_priv(dev)));
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}
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#if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY)
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/**
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* timer_early_get_rate() - Get the timer rate before driver model
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*/
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unsigned long notrace timer_early_get_rate(void)
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{
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return RISCV_MMODE_TIMER_FREQ;
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}
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/**
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* timer_early_get_count() - Get the timer count before driver model
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*
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*/
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u64 notrace timer_early_get_count(void)
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{
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return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE));
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}
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#endif
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static const struct timer_ops sifive_clint_ops = {
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.get_count = sifive_clint_get_count,
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};
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static int sifive_clint_probe(struct udevice *dev)
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{
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dev_set_priv(dev, dev_read_addr_ptr(dev));
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if (!dev_get_priv(dev))
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return -EINVAL;
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return timer_timebase_fallback(dev);
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}
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static const struct udevice_id sifive_clint_ids[] = {
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{ .compatible = "riscv,clint0" },
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{ .compatible = "sifive,clint0" },
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{ }
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};
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U_BOOT_DRIVER(sifive_clint) = {
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.name = "sifive_clint",
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.id = UCLASS_TIMER,
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.of_match = sifive_clint_ids,
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.probe = sifive_clint_probe,
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.ops = &sifive_clint_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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