at91sam9: add watchdog support
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c
index f3b146c..f50552a 100644
--- a/drivers/serial/atmel_usart.c
+++ b/drivers/serial/atmel_usart.c
@@ -16,6 +16,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <common.h>
+#include <watchdog.h>
#include <asm/io.h>
#include <asm/arch/clk.h>
@@ -87,7 +88,8 @@
int serial_getc(void)
{
- while (!(usart3_readl(CSR) & USART3_BIT(RXRDY))) ;
+ while (!(usart3_readl(CSR) & USART3_BIT(RXRDY)))
+ WATCHDOG_RESET();
return usart3_readl(RHR);
}
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
new file mode 100644
index 0000000..200968de
--- /dev/null
+++ b/drivers/watchdog/Makefile
@@ -0,0 +1,46 @@
+#
+# (C) Copyright 2008
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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 $(TOPDIR)/config.mk
+
+LIB := $(obj)libwatchdog.a
+
+COBJS-$(CONFIG_AT91SAM9_WATCHDOG) += at91sam9_wdt.o
+
+COBJS := $(COBJS-y)
+SRCS := $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS))
+
+all: $(LIB)
+
+$(LIB): $(obj).depend $(OBJS)
+ $(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
new file mode 100644
index 0000000..5bb8b77
--- /dev/null
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -0,0 +1,79 @@
+/*
+ * [origin: Linux kernel drivers/watchdog/at91sam9_wdt.c]
+ *
+ * Watchdog driver for Atmel AT91SAM9x processors.
+ *
+ * Copyright (C) 2008 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ * Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr
+ *
+ * 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.
+ */
+
+/*
+ * The Watchdog Timer Mode Register can be only written to once. If the
+ * timeout need to be set from U-Boot, be sure that the bootstrap doesn't
+ * write to this register. Inform Linux to it too
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/io.h>
+#include <asm/arch/at91_wdt.h>
+
+/*
+ * AT91SAM9 watchdog runs a 12bit counter @ 256Hz,
+ * use this to convert a watchdog
+ * value from/to milliseconds.
+ */
+#define ms_to_ticks(t) (((t << 8) / 1000) - 1)
+#define ticks_to_ms(t) (((t + 1) * 1000) >> 8)
+
+/* Hardware timeout in seconds */
+#define WDT_HW_TIMEOUT 2
+
+/*
+ * Set the watchdog time interval in 1/256Hz (write-once)
+ * Counter is 12 bit.
+ */
+static int at91_wdt_settimeout(unsigned int timeout)
+{
+ unsigned int reg;
+ unsigned int mr;
+
+ /* Check if disabled */
+ mr = at91_sys_read(AT91_WDT_MR);
+ if (mr & AT91_WDT_WDDIS) {
+ printf("sorry, watchdog is disabled\n");
+ return -1;
+ }
+
+ /*
+ * All counting occurs at SLOW_CLOCK / 128 = 256 Hz
+ *
+ * Since WDV is a 12-bit counter, the maximum period is
+ * 4096 / 256 = 16 seconds.
+ */
+ reg = AT91_WDT_WDRSTEN /* causes watchdog reset */
+ /* | AT91_WDT_WDRPROC causes processor reset only */
+ | AT91_WDT_WDDBGHLT /* disabled in debug mode */
+ | AT91_WDT_WDD /* restart at any time */
+ | (timeout & AT91_WDT_WDV); /* timer value */
+ at91_sys_write(AT91_WDT_MR, reg);
+
+ return 0;
+}
+
+void hw_watchdog_reset(void)
+{
+ at91_sys_write(AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
+}
+
+void hw_watchdog_init(void)
+{
+ /* 16 seconds timer, resets enabled */
+ at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
+}