mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-30 08:30:50 +09:00
d024236e5a
We have a large number of places where while we historically referenced gd in the code we no longer do, as well as cases where the code added that line "just in case" during development and never dropped it. Signed-off-by: Tom Rini <trini@konsulko.com>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/*
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* Copyright 2016 Google Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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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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#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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.flags = DM_FLAG_PRE_RELOC,
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};
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