This driver is a simplified version of linux/drivers/watchdog/bcm63xx_wdt.c
Signed-off-by: Álvaro Fernández Rojas <nolt...@gmail.com>
---
drivers/watchdog/Kconfig | 8 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/bcm6345_wdt.c | 109 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 118 insertions(+)
create mode 100644 drivers/watchdog/bcm6345_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index bdaf5d4..8d56af7 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -46,4 +46,12 @@ config WDT_ASPEED
It currently does not support Boot Flash Addressing Mode Detection or
Second Boot.
+config WDT_BCM6345
+ bool "BCM6345 watchdog timer support"
+ depends on WDT && ARCH_BMIPS
+ help
+ Select this to enable watchdog timer for BCM6345 SoCs.
+ The watchdog timer is stopped when initialized.
+ It performs full SoC reset.
+
endmenu
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 8378601..4b19e4c 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -18,4 +18,5 @@ obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o
obj-$(CONFIG_WDT) += wdt-uclass.o
obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o
obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
+obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o
obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
diff --git a/drivers/watchdog/bcm6345_wdt.c b/drivers/watchdog/bcm6345_wdt.c
new file mode 100644
index 0000000..858b6d5
--- /dev/null
+++ b/drivers/watchdog/bcm6345_wdt.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <nolt...@gmail.com>
+ *
+ * Derived from linux/drivers/watchdog/bcm63xx_wdt.c:
+ * Copyright (C) 2007 Miguel Gaio <miguel.g...@efixo.com>
+ * Copyright (C) 2008 Florian Fainelli <flor...@openwrt.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <wdt.h>
+#include <asm/io.h>
+
+/* WDT Value register */
+#define WDT_VAL_REG 0x0
+#define WDT_VAL_MIN 0x00000002
+#define WDT_VAL_MAX 0xfffffffe
+
+/* WDT Control register */
+#define WDT_CTL_REG 0x4
+#define WDT_CTL_START1_MASK 0x0000ff00
+#define WDT_CTL_START2_MASK 0x000000ff
+#define WDT_CTL_STOP1_MASK 0x0000ee00
+#define WDT_CTL_STOP2_MASK 0x000000ee
+
+struct bcm6345_wdt_priv {
+ void __iomem *regs;
+};
+
+static int bcm6345_wdt_reset(struct udevice *dev)
+{
+ struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
+
+ writel_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
+ writel_be(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG);
+
+ return 0;
+}
+
+static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+{
+ struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
+
+ if (timeout < WDT_VAL_MIN) {
+ debug("watchdog won't fire with less than 2 ticks\n");
+ timeout = WDT_VAL_MIN;
+ } else if (timeout > WDT_VAL_MAX) {
+ debug("maximum watchdog timeout exceeded\n");
+ timeout = WDT_VAL_MAX;
+ }
+
+ writel_be(timeout, priv->regs + WDT_VAL_REG);
+
+ return bcm6345_wdt_reset(dev);
+}
+
+static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags);
+}
+
+static int bcm6345_wdt_stop(struct udevice *dev)
+{
+ struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
+
+ writel_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
+ writel_be(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG);
+
+ return 0;
+}
+
+static const struct wdt_ops bcm6345_wdt_ops = {
+ .expire_now = bcm6345_wdt_expire_now,
+ .reset = bcm6345_wdt_reset,
+ .start = bcm6345_wdt_start,
+ .stop = bcm6345_wdt_stop,
+};
+
+static const struct udevice_id bcm6345_wdt_ids[] = {
+ { .compatible = "brcm,bcm6345-wdt" },
+ { /* sentinel */ }
+};
+
+static int bcm6345_wdt_probe(struct udevice *dev)
+{
+ struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
+ fdt_addr_t addr;
+ fdt_size_t size;
+
+ addr = dev_get_addr_size_index(dev, 0, &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->regs = ioremap(addr, size);
+
+ bcm6345_wdt_stop(dev);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(wdt_bcm6345) = {
+ .name = "wdt_bcm6345",
+ .id = UCLASS_WDT,
+ .of_match = bcm6345_wdt_ids,
+ .ops = &bcm6345_wdt_ops,
+ .priv_auto_alloc_size = sizeof(struct bcm6345_wdt_priv),
+ .probe = bcm6345_wdt_probe,
+};
--
2.1.4
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