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authorMichal Simek <michal.simek@xilinx.com>2013-04-22 11:23:16 +0200
committerMichal Simek <michal.simek@xilinx.com>2013-04-30 11:22:43 +0200
commit0f21f98dd4d6bff72df4eeaca4163779896cb336 (patch)
tree796651fceccc2d19ce2ba1e38156491dca8d6b0c /drivers/watchdog
parent8848668e136cccb30229b5e1484d41e0b5a6830a (diff)
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watchdog: Add support for Xilinx Microblaze watchdog
Watchdog can be used on Microblaze, PPC and Zynq hw designs. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Tom Rini <trini@ti.com>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Makefile1
-rw-r--r--drivers/watchdog/xilinx_tb_wdt.c87
2 files changed, 88 insertions, 0 deletions
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;
+}