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4b0129e810
Add the driver for the AST2700 Ibex timer, which uses CPU cycles as the timer count running at 200MHz. Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
45 lines
888 B
C
45 lines
888 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2024 Aspeed Technology Inc.
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*/
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#include <asm/csr.h>
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#include <asm/io.h>
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#include <dm.h>
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#include <errno.h>
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#include <timer.h>
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#define CSR_MCYCLE 0xb00
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#define CSR_MCYCLEH 0xb80
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static u64 ast_ibex_timer_get_count(struct udevice *dev)
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{
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uint32_t cnt_l, cnt_h;
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cnt_l = csr_read(CSR_MCYCLE);
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cnt_h = csr_read(CSR_MCYCLEH);
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return ((uint64_t)cnt_h << 32) | cnt_l;
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}
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static int ast_ibex_timer_probe(struct udevice *dev)
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{
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return 0;
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}
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static const struct timer_ops ast_ibex_timer_ops = {
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.get_count = ast_ibex_timer_get_count,
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};
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static const struct udevice_id ast_ibex_timer_ids[] = {
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{ .compatible = "aspeed,ast2700-ibex-timer" },
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{ }
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};
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U_BOOT_DRIVER(ast_ibex_timer) = {
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.name = "ast_ibex_timer",
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.id = UCLASS_TIMER,
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.of_match = ast_ibex_timer_ids,
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.probe = ast_ibex_timer_probe,
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.ops = &ast_ibex_timer_ops,
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};
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