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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Ralink / Mediatek RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
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*
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* Copyright (C) 2018 Stefan Roese <sr@denx.de>
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*
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* Based on the Linux driver version which is:
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <wdt.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct mt762x_wdt {
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void __iomem *regs;
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};
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#define TIMER_REG_TMRSTAT 0x00
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#define TIMER_REG_TMR1CTL 0x20
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#define TIMER_REG_TMR1LOAD 0x24
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#define TMR1CTL_ENABLE BIT(7)
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#define TMR1CTL_RESTART BIT(9)
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#define TMR1CTL_PRESCALE_SHIFT 16
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static int mt762x_wdt_ping(struct mt762x_wdt *priv)
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{
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writel(TMR1CTL_RESTART, priv->regs + TIMER_REG_TMRSTAT);
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return 0;
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}
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static int mt762x_wdt_start(struct udevice *dev, u64 ms, ulong flags)
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{
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struct mt762x_wdt *priv = dev_get_priv(dev);
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/* set the prescaler to 1ms == 1000us */
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writel(1000 << TMR1CTL_PRESCALE_SHIFT, priv->regs + TIMER_REG_TMR1CTL);
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writel(ms, priv->regs + TIMER_REG_TMR1LOAD);
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setbits_le32(priv->regs + TIMER_REG_TMR1CTL, TMR1CTL_ENABLE);
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return 0;
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}
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static int mt762x_wdt_stop(struct udevice *dev)
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{
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struct mt762x_wdt *priv = dev_get_priv(dev);
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mt762x_wdt_ping(priv);
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clrbits_le32(priv->regs + TIMER_REG_TMR1CTL, TMR1CTL_ENABLE);
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return 0;
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}
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static int mt762x_wdt_reset(struct udevice *dev)
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{
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struct mt762x_wdt *priv = dev_get_priv(dev);
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mt762x_wdt_ping(priv);
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return 0;
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}
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static int mt762x_wdt_probe(struct udevice *dev)
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{
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struct mt762x_wdt *priv = dev_get_priv(dev);
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priv->regs = dev_remap_addr(dev);
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if (!priv->regs)
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return -EINVAL;
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mt762x_wdt_stop(dev);
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return 0;
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}
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static const struct wdt_ops mt762x_wdt_ops = {
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.start = mt762x_wdt_start,
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.reset = mt762x_wdt_reset,
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.stop = mt762x_wdt_stop,
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};
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static const struct udevice_id mt762x_wdt_ids[] = {
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{ .compatible = "mediatek,mt7621-wdt" },
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{}
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};
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U_BOOT_DRIVER(mt762x_wdt) = {
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.name = "mt762x_wdt",
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.id = UCLASS_WDT,
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.of_match = mt762x_wdt_ids,
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.probe = mt762x_wdt_probe,
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.priv_auto = sizeof(struct mt762x_wdt),
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.ops = &mt762x_wdt_ops,
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};
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