From: Jan Kiszka jan.kiszka@siemens.com
To avoid the need of extra boot scripting on AM65x for loading a watchdog firmware, add the required rproc init and loading logic for the first R5F core to the watchdog start handler. The firmware itself is embedded into U-Boot binary.
One possible firmware source is https://github.com/siemens/k3-rti-wdt.
Signed-off-by: Jan Kiszka jan.kiszka@siemens.com --- drivers/watchdog/Kconfig | 20 ++++++++++++++++++++ drivers/watchdog/Makefile | 3 +++ drivers/watchdog/rti_wdt.c | 24 ++++++++++++++++++++++++ drivers/watchdog/rti_wdt_fw.S | 20 ++++++++++++++++++++ 4 files changed, 67 insertions(+) create mode 100644 drivers/watchdog/rti_wdt_fw.S
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index ee99bd2af1..fd6ab9a85b 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -162,6 +162,26 @@ config WDT_K3_RTI Say Y here if you want to include support for the K3 watchdog timer (RTI module) available in the K3 generation of processors.
+if WDT_K3_RTI + +config WDT_K3_RTI_LOAD_FW + bool "Load watchdog firmware" + depends on REMOTEPROC + help + Automatically load the specified firmware image into the MCU R5F + core 0. On the AM65x, this firmware is supposed to handle the expiry + of the watchdog timer, typically by resetting the system. + +config WDT_K3_RTI_FW_FILE + string "Watchdog firmware image file" + default "k3-rti-wdt.fw" + depends on WDT_K3_RTI_LOAD_FW + help + Firmware image to be embedded into U-Boot and loaded on watchdog + start. + +endif + config WDT_SANDBOX bool "Enable Watchdog Timer support for Sandbox" depends on SANDBOX && WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 16bdbf4970..bf58684875 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -28,7 +28,10 @@ obj-$(CONFIG_WDT_MT7621) += mt7621_wdt.o obj-$(CONFIG_WDT_MTK) += mtk_wdt.o obj-$(CONFIG_WDT_OMAP3) += omap_wdt.o obj-$(CONFIG_WDT_K3_RTI) += rti_wdt.o +obj-$(CONFIG_WDT_K3_RTI_LOAD_FW) += rti_wdt_fw.o obj-$(CONFIG_WDT_SP805) += sp805_wdt.o obj-$(CONFIG_WDT_STM32MP) += stm32mp_wdt.o obj-$(CONFIG_WDT_TANGIER) += tangier_wdt.o obj-$(CONFIG_WDT_XILINX) += xilinx_wwdt.o + +$(obj)/rti_wdt_fw.o: $(shell readlink -f $(CONFIG_WDT_K3_RTI_FW_FILE)) FORCE diff --git a/drivers/watchdog/rti_wdt.c b/drivers/watchdog/rti_wdt.c index ebe29c7409..38e82a6b6b 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -14,6 +14,7 @@ #include <power-domain.h> #include <wdt.h> #include <asm/io.h> +#include <remoteproc.h>
/* Timer register set definition */ #define RTIDWDCTRL 0x90 @@ -37,11 +38,16 @@
#define WDT_PRELOAD_MAX 0xfff
+#define RTI_PROC_ID 0 + struct rti_wdt_priv { phys_addr_t regs; unsigned int clk_khz; };
+extern const u32 rti_wdt_fw[]; +extern const int rti_wdt_fw_size; + static int rti_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) { struct rti_wdt_priv *priv = dev_get_priv(dev); @@ -51,6 +57,24 @@ static int rti_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) if (readl(priv->regs + RTIDWDCTRL) == WDENABLE_KEY) return -EBUSY;
+#ifdef CONFIG_WDT_K3_RTI_LOAD_FW + ret = rproc_dev_init(RTI_PROC_ID); + if (ret) { + fw_error: + dev_err(dev, "Failed to load watchdog firmware into remote processor %d\n", + RTI_PROC_ID); + return ret; + } + + ret = rproc_load(RTI_PROC_ID, (ulong)rti_wdt_fw, rti_wdt_fw_size); + if (ret) + goto fw_error; + + ret = rproc_start(RTI_PROC_ID); + if (ret) + goto fw_error; +#endif + timer_margin = timeout_ms * priv->clk_khz / 1000; timer_margin >>= WDT_PRELOAD_SHIFT; if (timer_margin > WDT_PRELOAD_MAX) diff --git a/drivers/watchdog/rti_wdt_fw.S b/drivers/watchdog/rti_wdt_fw.S new file mode 100644 index 0000000000..78d99ff9f2 --- /dev/null +++ b/drivers/watchdog/rti_wdt_fw.S @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) Siemens AG, 2020 + * + * Authors: + * Jan Kiszka jan.kiszka@siemens.com + */ + +.section .rodata + +.global rti_wdt_fw +.global rti_wdt_fw_size + +rti_wdt_fw: +.align 4 +.incbin CONFIG_WDT_K3_RTI_FW_FILE +rti_wdt_fw_end: + +rti_wdt_fw_size: +.int rti_wdt_fw_end - rti_wdt_fw