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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Cortina-Access
- *
- */
- #include <common.h>
- #include <dm.h>
- #include <hang.h>
- #include <asm/io.h>
- #include <wdt.h>
- #include <linux/bitops.h>
- #define CA_WDT_CTRL 0x00
- #define CA_WDT_PS 0x04
- #define CA_WDT_DIV 0x08
- #define CA_WDT_LD 0x0C
- #define CA_WDT_LOADE 0x10
- #define CA_WDT_CNT 0x14
- #define CA_WDT_IE 0x18
- #define CA_WDT_INT 0x1C
- #define CA_WDT_STAT 0x20
- /* CA_WDT_CTRL */
- #define CTL_WDT_EN BIT(0)
- #define CTL_WDT_RSTEN BIT(1)
- #define CTL_WDT_CLK_SEL BIT(2)
- /* CA_WDT_LOADE */
- #define WDT_UPD BIT(0)
- #define WDT_UPD_PS BIT(1)
- /* Global config */
- #define WDT_RESET_SUB BIT(4)
- #define WDT_RESET_ALL_BLOCK BIT(6)
- #define WDT_RESET_REMAP BIT(7)
- #define WDT_EXT_RESET BIT(8)
- #define WDT_RESET_DEFAULT (WDT_EXT_RESET | WDT_RESET_REMAP | \
- WDT_RESET_ALL_BLOCK | WDT_RESET_SUB)
- struct ca_wdt_priv {
- void __iomem *base;
- void __iomem *global_config;
- };
- static void cortina_wdt_set_timeout(struct udevice *dev, u64 timeout_ms)
- {
- struct ca_wdt_priv *priv = dev_get_priv(dev);
- /* Prescale using millisecond unit */
- writel(CORTINA_PER_IO_FREQ / 1000, priv->base + CA_WDT_PS);
- /* Millisecond */
- writel(1, priv->base + CA_WDT_DIV);
- writel(timeout_ms, priv->base + CA_WDT_LD);
- writel(WDT_UPD | WDT_UPD_PS, priv->base + CA_WDT_LOADE);
- }
- static int cortina_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
- {
- struct ca_wdt_priv *priv = dev_get_priv(dev);
- cortina_wdt_set_timeout(dev, timeout);
- /* WDT Reset option */
- setbits_32(priv->global_config, WDT_RESET_DEFAULT);
- /* Enable WDT */
- setbits_32(priv->base, CTL_WDT_EN | CTL_WDT_RSTEN | CTL_WDT_CLK_SEL);
- return 0;
- }
- static int cortina_wdt_stop(struct udevice *dev)
- {
- struct ca_wdt_priv *priv = dev_get_priv(dev);
- /* Disable WDT */
- writel(0, priv->base);
- return 0;
- }
- static int cortina_wdt_reset(struct udevice *dev)
- {
- struct ca_wdt_priv *priv = dev_get_priv(dev);
- /* Reload WDT counter */
- writel(WDT_UPD, priv->base + CA_WDT_LOADE);
- return 0;
- }
- static int cortina_wdt_expire_now(struct udevice *dev, ulong flags)
- {
- /* Set 1ms timeout to reset system */
- cortina_wdt_set_timeout(dev, 1);
- hang();
- return 0;
- }
- static int cortina_wdt_probe(struct udevice *dev)
- {
- struct ca_wdt_priv *priv = dev_get_priv(dev);
- priv->base = dev_remap_addr_index(dev, 0);
- if (!priv->base)
- return -ENOENT;
- priv->global_config = dev_remap_addr_index(dev, 1);
- if (!priv->global_config)
- return -ENOENT;
- /* Stop WDT */
- cortina_wdt_stop(dev);
- return 0;
- }
- static const struct wdt_ops cortina_wdt_ops = {
- .start = cortina_wdt_start,
- .reset = cortina_wdt_reset,
- .stop = cortina_wdt_stop,
- .expire_now = cortina_wdt_expire_now,
- };
- static const struct udevice_id cortina_wdt_ids[] = {
- {.compatible = "cortina,ca-wdt"},
- {}
- };
- U_BOOT_DRIVER(cortina_wdt) = {
- .name = "cortina_wdt",
- .id = UCLASS_WDT,
- .probe = cortina_wdt_probe,
- .of_match = cortina_wdt_ids,
- .ops = &cortina_wdt_ops,
- };
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