109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2017-2022 Weidmüller Interface GmbH & Co. KG
|
|
* Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
|
|
*
|
|
* Copyright (C) 2012 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2011-2017 Xilinx, Inc. All rights reserved.
|
|
*
|
|
* (C) Copyright 2008
|
|
* Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
|
|
*
|
|
* (C) Copyright 2004
|
|
* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
|
|
*
|
|
* (C) Copyright 2002-2004
|
|
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
|
|
*
|
|
* (C) Copyright 2003
|
|
* Texas Instruments <www.ti.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <fdtdec.h>
|
|
#include <timer.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
#define SCUTIMER_CONTROL_PRESCALER_MASK 0x0000FF00 /* Prescaler */
|
|
#define SCUTIMER_CONTROL_AUTO_RELOAD_MASK 0x00000002 /* Auto-reload */
|
|
#define SCUTIMER_CONTROL_ENABLE_MASK 0x00000001 /* Timer enable */
|
|
|
|
#define TIMER_LOAD_VAL 0xFFFFFFFF
|
|
|
|
struct arm_twd_timer_regs {
|
|
u32 load; /* Timer Load Register */
|
|
u32 counter; /* Timer Counter Register */
|
|
u32 control; /* Timer Control Register */
|
|
};
|
|
|
|
struct arm_twd_timer_priv {
|
|
struct arm_twd_timer_regs *base;
|
|
};
|
|
|
|
static u64 arm_twd_timer_get_count(struct udevice *dev)
|
|
{
|
|
struct arm_twd_timer_priv *priv = dev_get_priv(dev);
|
|
struct arm_twd_timer_regs *regs = priv->base;
|
|
u32 count = TIMER_LOAD_VAL - readl(®s->counter);
|
|
|
|
return timer_conv_64(count);
|
|
}
|
|
|
|
static int arm_twd_timer_probe(struct udevice *dev)
|
|
{
|
|
struct arm_twd_timer_priv *priv = dev_get_priv(dev);
|
|
struct arm_twd_timer_regs *regs;
|
|
fdt_addr_t addr;
|
|
|
|
addr = dev_read_addr(dev);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
priv->base = (struct arm_twd_timer_regs *)addr;
|
|
|
|
regs = priv->base;
|
|
|
|
/* Load the timer counter register */
|
|
writel(0xFFFFFFFF, ®s->load);
|
|
|
|
/*
|
|
* Start the A9Timer device
|
|
* Enable Auto reload mode, Clear prescaler control bits
|
|
* Set prescaler value, Enable the decrementer
|
|
*/
|
|
clrsetbits_le32(®s->control, SCUTIMER_CONTROL_PRESCALER_MASK,
|
|
SCUTIMER_CONTROL_AUTO_RELOAD_MASK |
|
|
SCUTIMER_CONTROL_ENABLE_MASK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct timer_ops arm_twd_timer_ops = {
|
|
.get_count = arm_twd_timer_get_count,
|
|
};
|
|
|
|
static const struct udevice_id arm_twd_timer_ids[] = {
|
|
{ .compatible = "arm,cortex-a9-twd-timer" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(arm_twd_timer) = {
|
|
.name = "arm_twd_timer",
|
|
.id = UCLASS_TIMER,
|
|
.of_match = arm_twd_timer_ids,
|
|
.priv_auto = sizeof(struct arm_twd_timer_priv),
|
|
.probe = arm_twd_timer_probe,
|
|
.ops = &arm_twd_timer_ops,
|
|
};
|