95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2016 Google Inc.
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*/
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#include <common.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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#include <asm/io.h>
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#include <asm/arch/timer.h>
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#include <linux/err.h>
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#define AST_TICK_TIMER 1
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#define AST_TMC_RELOAD_VAL 0xffffffff
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struct ast_timer_priv {
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struct ast_timer *regs;
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struct ast_timer_counter *tmc;
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};
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static struct ast_timer_counter *ast_get_timer_counter(struct ast_timer *timer,
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int n)
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{
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if (n > 3)
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return &timer->timers2[n - 4];
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else
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return &timer->timers1[n - 1];
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}
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static int ast_timer_probe(struct udevice *dev)
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{
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struct ast_timer_priv *priv = dev_get_priv(dev);
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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writel(AST_TMC_RELOAD_VAL, &priv->tmc->reload_val);
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/*
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* Stop the timer. This will also load reload_val into
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* the status register.
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*/
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clrbits_le32(&priv->regs->ctrl1,
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AST_TMC_EN << AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
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/* Start the timer from the fixed 1MHz clock. */
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setbits_le32(&priv->regs->ctrl1,
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(AST_TMC_EN | AST_TMC_1MHZ) <<
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AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
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uc_priv->clock_rate = AST_TMC_RATE;
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return 0;
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}
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static int ast_timer_get_count(struct udevice *dev, u64 *count)
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{
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struct ast_timer_priv *priv = dev_get_priv(dev);
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*count = AST_TMC_RELOAD_VAL - readl(&priv->tmc->status);
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return 0;
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}
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static int ast_timer_ofdata_to_platdata(struct udevice *dev)
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{
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struct ast_timer_priv *priv = dev_get_priv(dev);
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priv->regs = devfdt_get_addr_ptr(dev);
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if (IS_ERR(priv->regs))
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return PTR_ERR(priv->regs);
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priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER);
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return 0;
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}
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static const struct timer_ops ast_timer_ops = {
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.get_count = ast_timer_get_count,
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};
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static const struct udevice_id ast_timer_ids[] = {
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{ .compatible = "aspeed,ast2500-timer" },
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{ .compatible = "aspeed,ast2400-timer" },
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{ }
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};
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U_BOOT_DRIVER(ast_timer) = {
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.name = "ast_timer",
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.id = UCLASS_TIMER,
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.of_match = ast_timer_ids,
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.probe = ast_timer_probe,
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.priv_auto_alloc_size = sizeof(struct ast_timer_priv),
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.ofdata_to_platdata = ast_timer_ofdata_to_platdata,
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.ops = &ast_timer_ops,
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};
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