[PATCH 3/4] watchdog: cortina_wdt: add support for HW WDT on CAxxxx SoCs
Alex Nemirovsky
Alex.Nemirovsky at cortina-access.com
Mon Jan 20 10:53:43 CET 2020
From: Jason Li <jason.li at cortina-access.com>
Add support for hardware watchdog timer on all Cortina Access
CAxxxx family of SoCs.
Signed-off-by: Jason Li <jason.li at cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky at cortina-access.com>
---
MAINTAINERS | 2 +
drivers/watchdog/Kconfig | 8 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/cortina_wdt.c | 144 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 155 insertions(+)
create mode 100644 drivers/watchdog/cortina_wdt.c
diff --git a/MAINTAINERS b/MAINTAINERS
index b7b3359..f9334f9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -180,6 +180,7 @@ F: board/cortina/common/*
F: board/cortina/common/Kconfig
F: board/cortina/common/armv8/lowlevel_init.S
F: drivers/gpio/cortina_gpio.c
+F: drivers/watchdog/cortina_wdt.c
ARM/CZ.NIC TURRIS MOX SUPPORT
M: Marek Behun <marek.behun at nic.cz>
@@ -662,6 +663,7 @@ F: board/cortina/common/*
F: board/cortina/common/Kconfig
F: board/cortina/common/mips/*
F: drivers/gpio/cortina_gpio.c
+F: drivers/watchdog/cortina_wdt.c
MIPS MSCC
M: Gregory CLEMENT <gregory.clement at bootlin.com>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 8c16d69..2f7dedb 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -99,6 +99,14 @@ config WDT_CDNS
Select this to enable Cadence watchdog timer, which can be found on some
Xilinx Microzed Platform.
+config WDT_CORTINA
+ bool "Cortina Access CAxxxx watchdog timer support"
+ depends on WDT
+ help
+ Cortina Access CAxxxx watchdog timer support.
+ This driver support all CPU ISAs supported by Cortina
+ Access CAxxxx SoCs.
+
config WDT_MPC8xx
bool "MPC8xx watchdog timer support"
depends on WDT && MPC8xx
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 955caef..87f92a4 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o
obj-$(CONFIG_WDT_ARMADA_37XX) += armada-37xx-wdt.o
obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o
+obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o
obj-$(CONFIG_WDT_ORION) += orion_wdt.o
obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o
obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o
diff --git a/drivers/watchdog/cortina_wdt.c b/drivers/watchdog/cortina_wdt.c
new file mode 100644
index 0000000..61df802
--- /dev/null
+++ b/drivers/watchdog/cortina_wdt.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright (C) 2020 Cortina-Access
+ * Author: Jason Li <jason.li at cortina-access.com>
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <wdt.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);
+ unsigned int reg_v;
+
+ cortina_wdt_set_timeout(dev, timeout);
+
+ /* WDT Reset option */
+ reg_v = readl(priv->global_config);
+ reg_v |= WDT_RESET_DEFAULT;
+ writel(reg_v, priv->global_config);
+
+ /* Enable WDT */
+ reg_v = readl(priv->base);
+ reg_v |= (CTL_WDT_EN | CTL_WDT_RSTEN | CTL_WDT_CLK_SEL);
+ writel(reg_v, priv->base);
+
+ 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,cortina-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,
+};
--
2.7.4
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