a547fcb828
This flag has the word 'REMOVE' in it which means it conflicts with the DM_REMOVE flags. Rename it to DM_FLAG_LEAVE_PD_ON which seems to indicate its purpose well enough. Signed-off-by: Simon Glass <sjg@chromium.org>
124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) Siemens AG, 2020
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*
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* Authors:
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* Jan Kiszka <jan.kiszka@siemens.com>
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*
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* Derived from linux/drivers/watchdog/rti_wdt.c
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <power-domain.h>
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#include <wdt.h>
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#include <asm/io.h>
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/* Timer register set definition */
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#define RTIDWDCTRL 0x90
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#define RTIDWDPRLD 0x94
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#define RTIWDSTATUS 0x98
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#define RTIWDKEY 0x9c
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#define RTIDWDCNTR 0xa0
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#define RTIWWDRXCTRL 0xa4
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#define RTIWWDSIZECTRL 0xa8
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#define RTIWWDRX_NMI 0xa
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#define RTIWWDSIZE_50P 0x50
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#define WDENABLE_KEY 0xa98559da
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#define WDKEY_SEQ0 0xe51a
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#define WDKEY_SEQ1 0xa35c
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#define WDT_PRELOAD_SHIFT 13
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#define WDT_PRELOAD_MAX 0xfff
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struct rti_wdt_priv {
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phys_addr_t regs;
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unsigned int clk_khz;
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};
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static int rti_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
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{
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struct rti_wdt_priv *priv = dev_get_priv(dev);
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u32 timer_margin;
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int ret;
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if (readl(priv->regs + RTIDWDCTRL) == WDENABLE_KEY)
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return -EBUSY;
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timer_margin = timeout_ms * priv->clk_khz / 1000;
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timer_margin >>= WDT_PRELOAD_SHIFT;
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if (timer_margin > WDT_PRELOAD_MAX)
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timer_margin = WDT_PRELOAD_MAX;
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writel(timer_margin, priv->regs + RTIDWDPRLD);
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writel(RTIWWDRX_NMI, priv->regs + RTIWWDRXCTRL);
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writel(RTIWWDSIZE_50P, priv->regs + RTIWWDSIZECTRL);
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readl(priv->regs + RTIWWDSIZECTRL);
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writel(WDENABLE_KEY, priv->regs + RTIDWDCTRL);
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return 0;
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}
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static int rti_wdt_reset(struct udevice *dev)
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{
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struct rti_wdt_priv *priv = dev_get_priv(dev);
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u32 prld;
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/* Make sure we do not reset too early */
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prld = readl(priv->regs + RTIDWDPRLD) << WDT_PRELOAD_SHIFT;
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if (readl(priv->regs + RTIDWDCNTR) >= prld / 2)
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return -EPERM;
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writel(WDKEY_SEQ0, priv->regs + RTIWDKEY);
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writel(WDKEY_SEQ1, priv->regs + RTIWDKEY);
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return 0;
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}
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static int rti_wdt_probe(struct udevice *dev)
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{
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struct rti_wdt_priv *priv = dev_get_priv(dev);
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struct clk clk;
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int ret;
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priv->regs = devfdt_get_addr(dev);
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if (!priv->regs)
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return -EINVAL;
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret)
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return ret;
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priv->clk_khz = clk_get_rate(&clk);
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return 0;
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}
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static const struct wdt_ops rti_wdt_ops = {
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.start = rti_wdt_start,
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.reset = rti_wdt_reset,
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};
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static const struct udevice_id rti_wdt_ids[] = {
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{ .compatible = "ti,j7-rti-wdt" },
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{ }
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};
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U_BOOT_DRIVER(rti_wdt) = {
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.name = "rti_wdt",
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.id = UCLASS_WDT,
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.of_match = rti_wdt_ids,
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.ops = &rti_wdt_ops,
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.probe = rti_wdt_probe,
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.priv_auto = sizeof(struct rti_wdt_priv),
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.flags = DM_FLAG_LEAVE_PD_ON,
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};
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