[PATCH v2 07/11] watchdog: Add support for ADI SC5XX-family watchdog peripheral
Vasileios Bimpikas via B4 Relay
devnull+vasileios.bimpikas.analog.com at kernel.org
Mon Oct 21 15:54:38 CEST 2024
From: Oliver Gaskell <Oliver.Gaskell at analog.com>
Co-developed-by: Greg Malysa <greg.malysa at timesys.com>
Signed-off-by: Greg Malysa <greg.malysa at timesys.com>
Co-developed-by: Ian Roberts <ian.roberts at timesys.com>
Signed-off-by: Ian Roberts <ian.roberts at timesys.com>
Signed-off-by: Utsav Agarwal <utsav.agarwal at analog.com>
Signed-off-by: Arturs Artamonovs <arturs.artamonovs at analog.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison at timesys.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell at analog.com>
Reviewed-by: Stefan Roese <sr at denx.de>
Signed-off-by: Vasileios Bimpikas <vasileios.bimpikas at analog.com>
---
MAINTAINERS | 1 +
drivers/watchdog/Kconfig | 9 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/adi_wdt.c | 145 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 156 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index b853eec4d961abcd33fe722f3a7f49bf2f24ee29..b87a607124f5310f1b75a17fa201d1022d036c6d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -620,6 +620,7 @@ F: drivers/pinctrl/pinctrl-adi-adsp.c
F: drivers/serial/serial_adi_uart4.c
F: drivers/timer/adi_sc5xx_timer.c
F: drivers/usb/musb-new/sc5xx.c
+F: drivers/watchdog/adi_wdt.c
F: include/configs/sc5*
F: include/env/adi/
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 90bc5653ee332033db1ee4c7fbc914231f157f88..6e00e9b81c02f5892d4dfd37de9d7f1afc40da4a 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -95,6 +95,15 @@ config WDT_APPLE
The watchdog will perform a full SoC reset resulting in a
reboot of the entire system.
+config WDT_ADI
+ bool "Analog Devices watchdog timer support"
+ select WDT
+ select SPL_WDT if SPL
+ depends on ARCH_SC5XX
+ help
+ Enable this to support Watchdog Timer on ADI SC57X, SC58X, SC59X,
+ and SC59X_64 processors
+
config WDT_ARMADA_37XX
bool "Marvell Armada 37xx watchdog timer support"
depends on WDT && ARMADA_3700
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 51be6ab9abe07e410381029fc1dd7ce45787e765..af17dabeeef031ec099b225b3e7c9ae3e3e08b4f 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -51,3 +51,4 @@ obj-$(CONFIG_WDT_STM32MP) += stm32mp_wdt.o
obj-$(CONFIG_WDT_SUNXI) += sunxi_wdt.o
obj-$(CONFIG_WDT_TANGIER) += tangier_wdt.o
obj-$(CONFIG_WDT_XILINX) += xilinx_wwdt.o
+obj-$(CONFIG_WDT_ADI) += adi_wdt.o
diff --git a/drivers/watchdog/adi_wdt.c b/drivers/watchdog/adi_wdt.c
new file mode 100644
index 0000000000000000000000000000000000000000..67d17dc6928ea9e0c42e0322d6b1c77754f88d69
--- /dev/null
+++ b/drivers/watchdog/adi_wdt.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (C) Copyright 2022 - Analog Devices, Inc.
+ *
+ * Written and/or maintained by Timesys Corporation
+ *
+ * Converted to driver model by Nathan Barrett-Morrison
+ *
+ * Contact: Nathan Barrett-Morrison <nathan.morrison at timesys.com>
+ * Contact: Greg Malysa <greg.malysa at timesys.com>
+ *
+ * adi_wtd.c - driver for ADI on-chip watchdog
+ *
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <wdt.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+
+#define WDOG_CTL 0x0
+#define WDOG_CNT 0x4
+#define WDOG_STAT 0x8
+
+#define RCU_CTL 0x0
+#define RCU_STAT 0x4
+
+#define SEC_GCTL 0x0
+#define SEC_FCTL 0x10
+#define SEC_SCTL0 0x800
+
+#define WDEN 0x0010
+#define WDDIS 0x0AD0
+
+struct adi_wdt_priv {
+ void __iomem *rcu_base;
+ void __iomem *sec_base;
+ void __iomem *wdt_base;
+ struct clk clock;
+};
+
+static int adi_wdt_reset(struct udevice *dev)
+{
+ struct adi_wdt_priv *priv = dev_get_priv(dev);
+
+ writel(0, priv->wdt_base + WDOG_STAT);
+
+ return 0;
+}
+
+static int adi_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
+{
+ struct adi_wdt_priv *priv = dev_get_priv(dev);
+ u32 sctl_val;
+
+ /* Disable SYSCD_RESETb input and clear the RCU0 reset status */
+ writel(0xf, priv->rcu_base + RCU_STAT);
+ writel(0x0, priv->rcu_base + RCU_CTL);
+
+ /* reset the SEC controller */
+ writel(0x2, priv->sec_base + SEC_GCTL);
+ writel(0x2, priv->sec_base + SEC_FCTL);
+
+ udelay(50);
+
+ /* enable SEC fault event */
+ writel(0x1, priv->sec_base + SEC_GCTL);
+
+ /* ANOMALY 36100004 Spurious External Fault event occurs when FCTL
+ * is re-programmed when currently active fault is not cleared
+ */
+ writel(0xc0, priv->sec_base + SEC_FCTL);
+ writel(0xc1, priv->sec_base + SEC_FCTL);
+
+ /* enable SEC fault source for watchdog0 */
+ sctl_val = readl((priv->sec_base + SEC_SCTL0) + 3 * 8) | 0x6;
+ writel(sctl_val, (priv->sec_base + SEC_SCTL0) + 3 * 8);
+
+ /* Enable SYSCD_RESETb input */
+ writel(0x100, priv->rcu_base + RCU_CTL);
+
+ /* enable watchdog0 */
+ writel(WDDIS, priv->wdt_base + WDOG_CTL);
+
+ writel(timeout_ms / 1000 *
+ (clk_get_rate(&priv->clock) / (IS_ENABLED(CONFIG_SC58X) ? 2 : 1)),
+ priv->wdt_base + WDOG_CNT);
+
+ writel(0, priv->wdt_base + WDOG_STAT);
+ writel(WDEN, priv->wdt_base + WDOG_CTL);
+
+ return 0;
+}
+
+static int adi_wdt_probe(struct udevice *dev)
+{
+ struct adi_wdt_priv *priv = dev_get_priv(dev);
+ int ret;
+ struct resource res;
+
+ ret = dev_read_resource_byname(dev, "rcu", &res);
+ if (ret)
+ return ret;
+ priv->rcu_base = devm_ioremap(dev, res.start, resource_size(&res));
+
+ ret = dev_read_resource_byname(dev, "sec", &res);
+ if (ret)
+ return ret;
+ priv->sec_base = devm_ioremap(dev, res.start, resource_size(&res));
+
+ ret = dev_read_resource_byname(dev, "wdt", &res);
+ if (ret)
+ return ret;
+ priv->wdt_base = devm_ioremap(dev, res.start, resource_size(&res));
+
+ ret = clk_get_by_name(dev, "sclk0", &priv->clock);
+ if (ret < 0) {
+ printf("Can't get WDT clk: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct wdt_ops adi_wdt_ops = {
+ .start = adi_wdt_start,
+ .reset = adi_wdt_reset,
+};
+
+static const struct udevice_id adi_wdt_ids[] = {
+ { .compatible = "adi,wdt" },
+ {}
+};
+
+U_BOOT_DRIVER(adi_wdt) = {
+ .name = "adi_wdt",
+ .id = UCLASS_WDT,
+ .of_match = adi_wdt_ids,
+ .probe = adi_wdt_probe,
+ .ops = &adi_wdt_ops,
+ .priv_auto = sizeof(struct adi_wdt_priv),
+ .flags = DM_FLAG_PRE_RELOC,
+};
--
2.34.1
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