[U-Boot] [PATCH v2 4/4] watchdog: Add support for Xilinx Microblaze watchdog

Michal Simek
2013-04-23T13:33:39Z

Watchdog can be used on Microblaze, PPC and Zynq hw designs.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
Changes in v2:
- Fix define macros not to use trailing 1
- define watchdog_base as static variable
- label init and disable function as extern in header
- Add record to xparameters.h to get it compiled by default

arch/microblaze/include/asm/processor.h | 4 +
arch/microblaze/lib/board.c | 3 +
.../xilinx/microblaze-generic/microblaze-generic.c | 4 +
board/xilinx/microblaze-generic/xparameters.h | 4 +
doc/README.watchdog | 3 +
drivers/watchdog/Makefile | 1 +
drivers/watchdog/xilinx_tb_wdt.c | 87 ++++++++++++++++++++++
include/configs/microblaze-generic.h | 8 ++
8 files changed, 114 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..d33faeb 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 */
+extern int hw_watchdog_init(void);
+extern 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/board/xilinx/microblaze-generic/xparameters.h b/board/xilinx/microblaze-generic/xparameters.h
index 50a82d9..c846f97 100644
--- a/board/xilinx/microblaze-generic/xparameters.h
+++ b/board/xilinx/microblaze-generic/xparameters.h
@@ -77,3 +77,7 @@
#define XILINX_LLTEMAC_SDMA_CTRL_BASEADDR 0x42000180
#define XILINX_LLTEMAC_BASEADDR1 0x44200000
#define XILINX_LLTEMAC_FIFO_BASEADDR1 0x42100000
+
+/* Watchdog IP is wxi_timebase_wdt_0 */
+#define XILINX_WATCHDOG_BASEADDR 0x50000000
+#define XILINX_WATCHDOG_IRQ 1
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..f7c722e
--- /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 <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 */
+};
+
+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;
+}
diff --git a/include/configs/microblaze-generic.h b/include/configs/microblaze-generic.h
index 8c0353a..0c4e719 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
+# define CONFIG_XILINX_TB_WATCHDOG
+#endif
+
/*
* memory layout - Example
* CONFIG_SYS_TEXT_BASE = 0x1200_0000; defined in config.mk
--
1.8.2.1

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