Watchdog can be used on Microblaze, PPC and Zynq hw designs.
Signed-off-by: Michal Simek michal.simek@xilinx.com --- arch/microblaze/include/asm/processor.h | 4 + arch/microblaze/lib/board.c | 3 + .../xilinx/microblaze-generic/microblaze-generic.c | 4 + doc/README.watchdog | 3 + drivers/watchdog/Makefile | 1 + drivers/watchdog/xilinx_tb_wdt.c | 86 ++++++++++++++++++++++ include/configs/microblaze-generic.h | 8 ++ 7 files changed, 109 insertions(+) create mode 100644 drivers/watchdog/xilinx_tb_wdt.c
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h index 2c4d5ff..9d19dda 100644 --- a/arch/microblaze/include/asm/processor.h +++ b/arch/microblaze/include/asm/processor.h @@ -31,4 +31,8 @@ extern char __text_start[]; /* Microblaze board initialization function */ void board_init(void);
+/* Watchdog functions */ +int hw_watchdog_init(void); +void hw_watchdog_disable(void); + #endif /* __ASM_MICROBLAZE_PROCESSOR_H */ diff --git a/arch/microblaze/lib/board.c b/arch/microblaze/lib/board.c index a7c2f76..815fb5a 100644 --- a/arch/microblaze/lib/board.c +++ b/arch/microblaze/lib/board.c @@ -61,6 +61,9 @@ init_fnc_t *init_sequence[] = { serial_init, console_init_f, interrupts_init, +#ifdef CONFIG_XILINX_TB_WATCHDOG + hw_watchdog_init, +#endif timer_init, NULL, }; diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c index 1af0b86..befbb3a 100644 --- a/board/xilinx/microblaze-generic/microblaze-generic.c +++ b/board/xilinx/microblaze-generic/microblaze-generic.c @@ -39,6 +39,10 @@ int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) ++(*((unsigned long *)(CONFIG_SYS_GPIO_0_ADDR))); #endif
+#ifdef CONFIG_XILINX_TB_WATCHDOG + hw_watchdog_disable(); +#endif + puts ("Reseting board\n"); __asm__ __volatile__ (" mts rmsr, r0;" \ "bra r0"); diff --git a/doc/README.watchdog b/doc/README.watchdog index ee65008..33f31c2 100644 --- a/doc/README.watchdog +++ b/doc/README.watchdog @@ -27,3 +27,6 @@ CONFIG_IMX_WATCHDOG Available for i.mx31/35/5x/6x to service the watchdog. This is not automatically set because some boards (vision2) still need to define their own hw_watchdog_reset routine. + +CONFIG_XILINX_TB_WATCHDOG + Available for Xilinx Axi platforms to service timebase watchdog timer. diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index b1f4e0f..13e7c37 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -32,6 +32,7 @@ COBJS-y += imx_watchdog.o endif COBJS-$(CONFIG_TNETV107X_WATCHDOG) += tnetv107x_wdt.o COBJS-$(CONFIG_S5P) += s5p_wdt.o +COBJS-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/watchdog/xilinx_tb_wdt.c b/drivers/watchdog/xilinx_tb_wdt.c new file mode 100644 index 0000000..0c1f0d6 --- /dev/null +++ b/drivers/watchdog/xilinx_tb_wdt.c @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2011-2013 Xilinx Inc. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/microblaze_intc.h> +#include <asm/processor.h> +#include <watchdog.h> + +#define XWT_CSR0_WRS_MASK 0x00000008 /* Reset status Mask */ +#define XWT_CSR0_WDS_MASK 0x00000004 /* Timer state Mask */ +#define XWT_CSR0_EWDT1_MASK 0x00000002 /* Enable bit 1 Mask*/ +#define XWT_CSRX_EWDT2_MASK 0x00000001 /* Enable bit 2 Mask */ + +struct watchdog_regs { + u32 twcsr0; /* 0x0 */ + u32 twcsr1; /* 0x4 */ + u32 tbr; /* 0x8 */ +}; + +#define watchdog_base ((struct watchdog_regs *)CONFIG_WATCHDOG_BASEADDR) + +void hw_watchdog_reset(void) +{ + u32 reg; + + /* Read the current contents of TCSR0 */ + reg = readl(&watchdog_base->twcsr0); + + /* Clear the watchdog WDS bit */ + if (reg & (XWT_CSR0_EWDT1_MASK | XWT_CSRX_EWDT2_MASK)) + writel(reg | XWT_CSR0_WDS_MASK, &watchdog_base->twcsr0); +} + +void hw_watchdog_disable(void) +{ + u32 reg; + + /* Read the current contents of TCSR0 */ + reg = readl(&watchdog_base->twcsr0); + + writel(reg & ~XWT_CSR0_EWDT1_MASK, &watchdog_base->twcsr0); + writel(~XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1); + + puts("Watchdog disabled!\n"); +} + +static void hw_watchdog_isr(void *arg) +{ + hw_watchdog_reset(); +} + +int hw_watchdog_init(void) +{ + int ret; + + writel((XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK | XWT_CSR0_EWDT1_MASK), + &watchdog_base->twcsr0); + writel(XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1); + + ret = install_interrupt_handler(CONFIG_WATCHDOG_IRQ, + hw_watchdog_isr, NULL); + if (ret) + return 1; + + return 0; +} diff --git a/include/configs/microblaze-generic.h b/include/configs/microblaze-generic.h index 2b7ccf4..87c192c 100644 --- a/include/configs/microblaze-generic.h +++ b/include/configs/microblaze-generic.h @@ -120,6 +120,14 @@ # define CONFIG_SYS_TIMER_0_IRQ XILINX_TIMER_IRQ #endif
+/* watchdog */ +#if defined(XILINX_WATCHDOG_BASEADDR) && defined(XILINX_WATCHDOG_IRQ) +# define CONFIG_WATCHDOG_BASEADDR XILINX_WATCHDOG_BASEADDR +# define CONFIG_WATCHDOG_IRQ XILINX_WATCHDOG_IRQ +# define CONFIG_HW_WATCHDOG 1 +# define CONFIG_XILINX_TB_WATCHDOG 1 +#endif + /* * memory layout - Example * CONFIG_SYS_TEXT_BASE = 0x1200_0000; defined in config.mk -- 1.8.2.1