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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Ralink / Mediatek RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
- *
- * Copyright (C) 2018 Stefan Roese <sr@denx.de>
- *
- * Based on the Linux driver version which is:
- * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
- */
- #include <common.h>
- #include <dm.h>
- #include <wdt.h>
- #include <linux/bitops.h>
- #include <linux/io.h>
- DECLARE_GLOBAL_DATA_PTR;
- struct mt762x_wdt {
- void __iomem *regs;
- };
- #define TIMER_REG_TMRSTAT 0x00
- #define TIMER_REG_TMR1CTL 0x20
- #define TIMER_REG_TMR1LOAD 0x24
- #define TMR1CTL_ENABLE BIT(7)
- #define TMR1CTL_RESTART BIT(9)
- #define TMR1CTL_PRESCALE_SHIFT 16
- static int mt762x_wdt_ping(struct mt762x_wdt *priv)
- {
- writel(TMR1CTL_RESTART, priv->regs + TIMER_REG_TMRSTAT);
- return 0;
- }
- static int mt762x_wdt_start(struct udevice *dev, u64 ms, ulong flags)
- {
- struct mt762x_wdt *priv = dev_get_priv(dev);
- /* set the prescaler to 1ms == 1000us */
- writel(1000 << TMR1CTL_PRESCALE_SHIFT, priv->regs + TIMER_REG_TMR1CTL);
- writel(ms, priv->regs + TIMER_REG_TMR1LOAD);
- setbits_le32(priv->regs + TIMER_REG_TMR1CTL, TMR1CTL_ENABLE);
- return 0;
- }
- static int mt762x_wdt_stop(struct udevice *dev)
- {
- struct mt762x_wdt *priv = dev_get_priv(dev);
- mt762x_wdt_ping(priv);
- clrbits_le32(priv->regs + TIMER_REG_TMR1CTL, TMR1CTL_ENABLE);
- return 0;
- }
- static int mt762x_wdt_reset(struct udevice *dev)
- {
- struct mt762x_wdt *priv = dev_get_priv(dev);
- mt762x_wdt_ping(priv);
- return 0;
- }
- static int mt762x_wdt_probe(struct udevice *dev)
- {
- struct mt762x_wdt *priv = dev_get_priv(dev);
- priv->regs = dev_remap_addr(dev);
- if (!priv->regs)
- return -EINVAL;
- mt762x_wdt_stop(dev);
- return 0;
- }
- static const struct wdt_ops mt762x_wdt_ops = {
- .start = mt762x_wdt_start,
- .reset = mt762x_wdt_reset,
- .stop = mt762x_wdt_stop,
- };
- static const struct udevice_id mt762x_wdt_ids[] = {
- { .compatible = "mediatek,mt7621-wdt" },
- {}
- };
- U_BOOT_DRIVER(mt762x_wdt) = {
- .name = "mt762x_wdt",
- .id = UCLASS_WDT,
- .of_match = mt762x_wdt_ids,
- .probe = mt762x_wdt_probe,
- .priv_auto_alloc_size = sizeof(struct mt762x_wdt),
- .ops = &mt762x_wdt_ops,
- };
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