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4b969deac0
Add DM and DT probing support to iMX watchdog driver. This should allow boards to move over to this driver, enable SYSRESET_WATCHDOG to handle cpu_reset() if required. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Peng Fan <Peng.Fan@freescale.com> Cc: Stefano Babic <sbabic@denx.de> Tested-by: Heiko Schocher <hs@denx.de>
152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/*
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* watchdog.c - driver for i.mx on-chip watchdog
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <wdt.h>
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#include <watchdog.h>
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#include <asm/arch/imx-regs.h>
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#ifdef CONFIG_FSL_LSCH2
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#include <asm/arch/immap_lsch2.h>
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#endif
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#include <fsl_wdog.h>
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static void imx_watchdog_expire_now(struct watchdog_regs *wdog)
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{
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clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, WCR_WDE);
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writew(0x5555, &wdog->wsr);
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writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */
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while (1) {
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/*
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* spin for .5 seconds before reset
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*/
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}
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}
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#if !defined(CONFIG_IMX_WATCHDOG) || \
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(defined(CONFIG_IMX_WATCHDOG) && !CONFIG_IS_ENABLED(WDT))
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void __attribute__((weak)) reset_cpu(ulong addr)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_expire_now(wdog);
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}
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#endif
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#if defined(CONFIG_IMX_WATCHDOG)
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static void imx_watchdog_reset(struct watchdog_regs *wdog)
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{
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#ifndef CONFIG_WATCHDOG_RESET_DISABLE
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writew(0x5555, &wdog->wsr);
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writew(0xaaaa, &wdog->wsr);
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#endif /* CONFIG_WATCHDOG_RESET_DISABLE*/
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}
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static void imx_watchdog_init(struct watchdog_regs *wdog)
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{
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u16 timeout;
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/*
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* The timer watchdog can be set between
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* 0.5 and 128 Seconds. If not defined
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* in configuration file, sets 128 Seconds
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*/
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#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
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#define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
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#endif
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timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
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#ifdef CONFIG_FSL_LSCH2
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writew((WCR_WDA | WCR_SRS | WCR_WDE) << 8 | timeout, &wdog->wcr);
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#else
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writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
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WCR_WDA | SET_WCR_WT(timeout), &wdog->wcr);
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#endif /* CONFIG_FSL_LSCH2*/
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imx_watchdog_reset(wdog);
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}
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#if !CONFIG_IS_ENABLED(WDT)
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void hw_watchdog_reset(void)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_reset(wdog);
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}
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void hw_watchdog_init(void)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_init(wdog);
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}
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#else
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struct imx_wdt_priv {
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void __iomem *base;
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};
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static int imx_wdt_reset(struct udevice *dev)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_reset(priv->base);
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return 0;
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}
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static int imx_wdt_expire_now(struct udevice *dev, ulong flags)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_expire_now(priv->base);
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hang();
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return 0;
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}
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static int imx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_init(priv->base);
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return 0;
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}
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static int imx_wdt_probe(struct udevice *dev)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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priv->base = dev_read_addr_ptr(dev);
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if (!priv->base)
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return -ENOENT;
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return 0;
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}
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static const struct wdt_ops imx_wdt_ops = {
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.start = imx_wdt_start,
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.reset = imx_wdt_reset,
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.expire_now = imx_wdt_expire_now,
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};
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static const struct udevice_id imx_wdt_ids[] = {
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{ .compatible = "fsl,imx21-wdt" },
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{}
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};
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U_BOOT_DRIVER(imx_wdt) = {
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.name = "imx_wdt",
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.id = UCLASS_WDT,
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.of_match = imx_wdt_ids,
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.probe = imx_wdt_probe,
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.ops = &imx_wdt_ops,
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.priv_auto_alloc_size = sizeof(struct imx_wdt_priv),
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.flags = DM_FLAG_PRE_RELOC,
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};
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#endif
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#endif
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