From 0f21f98dd4d6bff72df4eeaca4163779896cb336 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Mon, 22 Apr 2013 11:23:16 +0200 Subject: watchdog: Add support for Xilinx Microblaze watchdog Watchdog can be used on Microblaze, PPC and Zynq hw designs. Signed-off-by: Michal Simek Reviewed-by: Tom Rini --- drivers/watchdog/Makefile | 1 + drivers/watchdog/xilinx_tb_wdt.c | 87 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+) create mode 100644 drivers/watchdog/xilinx_tb_wdt.c (limited to 'drivers') diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index b1f4e0f03f..13e7c37686 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 0000000000..f7c722e7ca --- /dev/null +++ b/drivers/watchdog/xilinx_tb_wdt.c @@ -0,0 +1,87 @@ +/* + * 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 +#include +#include +#include +#include + +#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 */ +}; + +static struct watchdog_regs *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; +} -- cgit v1.2.1