123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (c) 2020 Aspeed Technology, Inc
- */
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <log.h>
- #include <wdt.h>
- #include <asm/io.h>
- #include <asm/arch/wdt_ast2600.h>
- #include <linux/err.h>
- struct ast2600_wdt_priv {
- struct ast2600_wdt *regs;
- };
- static int ast2600_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
- {
- struct ast2600_wdt_priv *priv = dev_get_priv(dev);
- struct ast2600_wdt *wdt = priv->regs;
- /* WDT counts in the 1MHz frequency, namely 1us */
- writel((u32)(timeout_ms * 1000), &wdt->counter_reload_val);
- writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
- writel(WDT_CTRL_EN | WDT_CTRL_RESET, &wdt->ctrl);
- return 0;
- }
- static int ast2600_wdt_stop(struct udevice *dev)
- {
- struct ast2600_wdt_priv *priv = dev_get_priv(dev);
- struct ast2600_wdt *wdt = priv->regs;
- clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
- writel(WDT_RESET_MASK1_DEFAULT, &wdt->reset_mask1);
- writel(WDT_RESET_MASK2_DEFAULT, &wdt->reset_mask2);
- return 0;
- }
- static int ast2600_wdt_reset(struct udevice *dev)
- {
- struct ast2600_wdt_priv *priv = dev_get_priv(dev);
- struct ast2600_wdt *wdt = priv->regs;
- writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
- return 0;
- }
- static int ast2600_wdt_expire_now(struct udevice *dev, ulong flags)
- {
- int ret;
- struct ast2600_wdt_priv *priv = dev_get_priv(dev);
- struct ast2600_wdt *wdt = priv->regs;
- ret = ast2600_wdt_start(dev, 1, flags);
- if (ret)
- return ret;
- while (readl(&wdt->ctrl) & WDT_CTRL_EN)
- ;
- return ast2600_wdt_stop(dev);
- }
- static int ast2600_wdt_of_to_plat(struct udevice *dev)
- {
- struct ast2600_wdt_priv *priv = dev_get_priv(dev);
- priv->regs = dev_read_addr_ptr(dev);
- if (!priv->regs)
- return -EINVAL;
- return 0;
- }
- static const struct wdt_ops ast2600_wdt_ops = {
- .start = ast2600_wdt_start,
- .reset = ast2600_wdt_reset,
- .stop = ast2600_wdt_stop,
- .expire_now = ast2600_wdt_expire_now,
- };
- static const struct udevice_id ast2600_wdt_ids[] = {
- { .compatible = "aspeed,ast2600-wdt" },
- { }
- };
- static int ast2600_wdt_probe(struct udevice *dev)
- {
- debug("%s() wdt%u\n", __func__, dev_seq(dev));
- ast2600_wdt_stop(dev);
- return 0;
- }
- U_BOOT_DRIVER(ast2600_wdt) = {
- .name = "ast2600_wdt",
- .id = UCLASS_WDT,
- .of_match = ast2600_wdt_ids,
- .probe = ast2600_wdt_probe,
- .priv_auto = sizeof(struct ast2600_wdt_priv),
- .of_to_plat = ast2600_wdt_of_to_plat,
- .ops = &ast2600_wdt_ops,
- };
|