mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 11:33:32 +00:00
894e235f14
The driver was using milliseconds and programming it into a register which takes ticks of the watchdog clock, which runs at 1MHz. This meant we were off by 1000 with the desired value. When06985289d4("watchdog: Implement generic watchdog_reset() version") was added the aspeed board would leave the watchdog running, causing it to bite before u-boot was done. Discovered by booting in qemu: $ qemu-system-arm -M ast2500-evb -drive file=test.img,format=raw,if=mtd -nographic -no-reboot -d cpu_reset U-Boot 2019.07-rc3-00091-g2253e40caef5 (Jun 06 2019 - 16:53:23 +0930) Model: Aspeed BMC DRAM: 496 MiB WDT: Started with servicing (60s timeout) MMC: In: serial@1e784000 Out: serial@1e784000 Err: serial@1e784000 Watchdog timer expired. Fixes:06985289d4("watchdog: Implement generic watchdog_reset() version") Signed-off-by: Joel Stanley <joel@jms.id.au>
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2017 Google, Inc
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <wdt.h>
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#include <asm/io.h>
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#include <asm/arch/wdt.h>
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#define WDT_AST2500 2500
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#define WDT_AST2400 2400
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struct ast_wdt_priv {
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struct ast_wdt *regs;
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};
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static int ast_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct ast_wdt_priv *priv = dev_get_priv(dev);
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ulong driver_data = dev_get_driver_data(dev);
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u32 reset_mode = ast_reset_mode_from_flags(flags);
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/* 32 bits at 1MHz is 4294967ms */
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timeout = min_t(u64, timeout, 4294967);
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/* WDT counts in ticks of 1MHz clock. 1ms / 1e3 * 1e6 */
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timeout *= 1000;
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clrsetbits_le32(&priv->regs->ctrl,
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WDT_CTRL_RESET_MASK << WDT_CTRL_RESET_MODE_SHIFT,
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reset_mode << WDT_CTRL_RESET_MODE_SHIFT);
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if (driver_data >= WDT_AST2500 && reset_mode == WDT_CTRL_RESET_SOC)
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writel(ast_reset_mask_from_flags(flags),
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&priv->regs->reset_mask);
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writel((u32) timeout, &priv->regs->counter_reload_val);
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writel(WDT_COUNTER_RESTART_VAL, &priv->regs->counter_restart);
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/*
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* Setting CLK1MHZ bit is just for compatibility with ast2400 part.
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* On ast2500 watchdog timer clock is fixed at 1MHz and the bit is
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* read-only
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*/
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setbits_le32(&priv->regs->ctrl,
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WDT_CTRL_EN | WDT_CTRL_RESET | WDT_CTRL_CLK1MHZ);
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return 0;
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}
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static int ast_wdt_stop(struct udevice *dev)
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{
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struct ast_wdt_priv *priv = dev_get_priv(dev);
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clrbits_le32(&priv->regs->ctrl, WDT_CTRL_EN);
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writel(WDT_RESET_DEFAULT, &priv->regs->reset_mask);
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return 0;
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}
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static int ast_wdt_reset(struct udevice *dev)
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{
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struct ast_wdt_priv *priv = dev_get_priv(dev);
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writel(WDT_COUNTER_RESTART_VAL, &priv->regs->counter_restart);
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return 0;
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}
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static int ast_wdt_expire_now(struct udevice *dev, ulong flags)
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{
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struct ast_wdt_priv *priv = dev_get_priv(dev);
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int ret;
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ret = ast_wdt_start(dev, 1, flags);
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if (ret)
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return ret;
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while (readl(&priv->regs->ctrl) & WDT_CTRL_EN)
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;
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return ast_wdt_stop(dev);
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}
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static int ast_wdt_ofdata_to_platdata(struct udevice *dev)
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{
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struct ast_wdt_priv *priv = dev_get_priv(dev);
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priv->regs = devfdt_get_addr_ptr(dev);
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if (IS_ERR(priv->regs))
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return PTR_ERR(priv->regs);
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return 0;
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}
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static const struct wdt_ops ast_wdt_ops = {
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.start = ast_wdt_start,
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.reset = ast_wdt_reset,
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.stop = ast_wdt_stop,
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.expire_now = ast_wdt_expire_now,
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};
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static const struct udevice_id ast_wdt_ids[] = {
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{ .compatible = "aspeed,wdt", .data = WDT_AST2500 },
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{ .compatible = "aspeed,ast2500-wdt", .data = WDT_AST2500 },
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{ .compatible = "aspeed,ast2400-wdt", .data = WDT_AST2400 },
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{}
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};
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static int ast_wdt_probe(struct udevice *dev)
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{
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debug("%s() wdt%u\n", __func__, dev->seq);
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ast_wdt_stop(dev);
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return 0;
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}
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U_BOOT_DRIVER(ast_wdt) = {
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.name = "ast_wdt",
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.id = UCLASS_WDT,
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.of_match = ast_wdt_ids,
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.probe = ast_wdt_probe,
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.priv_auto_alloc_size = sizeof(struct ast_wdt_priv),
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.ofdata_to_platdata = ast_wdt_ofdata_to_platdata,
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.ops = &ast_wdt_ops,
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};
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