u-boot/drivers/timer/ast_timer.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

94 lines
2.1 KiB
C

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