Merge branch 'master' of git://git.denx.de/u-boot-at91

10 files changed, 487 insertions, 5 deletions

diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 631b969bbc..175d82a792 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -1788,13 +1788,10 @@ static void flash_fixup_atmel(flash_info_t *info, struct cfi_qry *qry)
 
 	/* AT49BV6416(T) list the erase regions in the wrong order.
 	 * However, the device ID is identical with the non-broken
-	 * AT49BV642D since u-boot only reads the low byte (they
-	 * differ in the high byte.) So leave out this fixup for now.
+	 * AT49BV642D they differ in the high byte.
 	 */
-#if 0
 	if (info->device_id == 0xd6 || info->device_id == 0xd2)
 		reverse_geometry = !reverse_geometry;
-#endif
 
 	if (reverse_geometry)
 		cfi_reverse_geometry(qry);
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 696d5fbbba..bb99a349ac 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
 LIB	:= $(obj)libserial.a
 
 COBJS-$(CONFIG_ARM_DCC) += arm_dcc.o
+COBJS-$(CONFIG_AT91RM9200_USART) += at91rm9200_usart.o
 COBJS-$(CONFIG_ATMEL_USART) += atmel_usart.o
 COBJS-$(CONFIG_MCFUART) += mcfuart.o
 COBJS-$(CONFIG_NS9750_UART) += ns9750_serial.o
diff --git a/drivers/serial/at91rm9200_usart.c b/drivers/serial/at91rm9200_usart.c
new file mode 100644
index 0000000000..858bde97c1
--- /dev/null
+++ b/drivers/serial/at91rm9200_usart.c
@@ -0,0 +1,118 @@
+/*
+ * (C) Copyright 2002
+ * Lineo, Inc <www.lineo.com>
+ * Bernhard Kuhn <bkuhn@lineo.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
+ *
+ * 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/arch/hardware.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if !defined(CONFIG_DBGU) && !defined(CONFIG_USART0) && !defined(CONFIG_USART1)
+#error must define one of CONFIG_DBGU or CONFIG_USART0 or CONFIG_USART1
+#endif
+
+/* ggi thunder */
+#ifdef CONFIG_DBGU
+AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;
+#endif
+#ifdef CONFIG_USART0
+AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US0;
+#endif
+#ifdef CONFIG_USART1
+AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US1;
+#endif
+
+void serial_setbrg (void)
+{
+	int baudrate;
+
+	if ((baudrate = gd->baudrate) <= 0)
+		baudrate = CONFIG_BAUDRATE;
+	/* MASTER_CLOCK/(16 * baudrate) */
+	us->US_BRGR = (AT91C_MASTER_CLOCK >> 4) / (unsigned)baudrate;
+}
+
+int serial_init (void)
+{
+	/* make any port initializations specific to this port */
+#ifdef CONFIG_DBGU
+	*AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD;	/* PA 31 & 30 */
+	*AT91C_PMC_PCER = 1 << AT91C_ID_SYS;	/* enable clock */
+#endif
+#ifdef CONFIG_USART0
+	*AT91C_PIOA_PDR = AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
+	*AT91C_PMC_PCER |= 1 << AT91C_ID_USART0;	/* enable clock */
+#endif
+#ifdef CONFIG_USART1
+	*AT91C_PIOB_PDR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
+	*AT91C_PMC_PCER |= 1 << AT91C_ID_USART1;	/* enable clock */
+#endif
+	serial_setbrg ();
+
+	us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
+	us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
+	us->US_MR =
+		(AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS |
+		 AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT);
+	us->US_IMR = ~0ul;
+	return (0);
+}
+
+void serial_exit (void)
+{
+	us->US_CR = (AT91C_US_RSTRX | AT91C_US_RSTTX);
+}
+
+void serial_putc (const char c)
+{
+	if (c == '\n')
+		serial_putc ('\r');
+	while ((us->US_CSR & AT91C_US_TXRDY) == 0);
+	us->US_THR = c;
+}
+
+void serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+int serial_getc (void)
+{
+	while ((us->US_CSR & AT91C_US_RXRDY) == 0);
+	return us->US_RHR;
+}
+
+int serial_tstc (void)
+{
+	return ((us->US_CSR & AT91C_US_RXRDY) == AT91C_US_RXRDY);
+}
diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c
index f3b146c22d..f50552a2c7 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 @@ void serial_puts(const char *s)
 
 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/spi/Makefile b/drivers/spi/Makefile
index 6e2c121d67..1350f3e0bf 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB	:= $(obj)libspi.a
 
+COBJS-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o
 COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
 COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o
 COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
diff --git a/drivers/spi/atmel_dataflash_spi.c b/drivers/spi/atmel_dataflash_spi.c
new file mode 100644
index 0000000000..3eb252c5b5
--- /dev/null
+++ b/drivers/spi/atmel_dataflash_spi.c
@@ -0,0 +1,157 @@
+/*
+ * Driver for ATMEL DataFlash support
+ * Author : Hamid Ikdoumi (Atmel)
+ *
+ * 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/arch/hardware.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/io.h>
+#include <asm/arch/at91_pio.h>
+#include <asm/arch/at91_spi.h>
+
+#include <dataflash.h>
+
+#define AT91_SPI_PCS0_DATAFLASH_CARD	0xE	/* Chip Select 0: NPCS0%1110 */
+#define AT91_SPI_PCS1_DATAFLASH_CARD	0xD	/* Chip Select 0: NPCS0%1101 */
+#define AT91_SPI_PCS3_DATAFLASH_CARD	0x7	/* Chip Select 3: NPCS3%0111 */
+
+void AT91F_SpiInit(void)
+{
+	/* Reset the SPI */
+	writel(AT91_SPI_SWRST, AT91_BASE_SPI + AT91_SPI_CR);
+
+	/* Configure SPI in Master Mode with No CS selected !!! */
+	writel(AT91_SPI_MSTR | AT91_SPI_MODFDIS | AT91_SPI_PCS,
+	       AT91_BASE_SPI + AT91_SPI_MR);
+
+	/* Configure CS0 */
+	writel(AT91_SPI_NCPHA |
+	       (AT91_SPI_DLYBS & DATAFLASH_TCSS) |
+	       (AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
+	       ((AT91_MASTER_CLOCK / AT91_SPI_CLK) << 8),
+	       AT91_BASE_SPI + AT91_SPI_CSR(0));
+
+#ifdef CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS1
+	/* Configure CS1 */
+	writel(AT91_SPI_NCPHA |
+	       (AT91_SPI_DLYBS & DATAFLASH_TCSS) |
+	       (AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
+	       ((AT91_MASTER_CLOCK / AT91_SPI_CLK) << 8),
+	       AT91_BASE_SPI + AT91_SPI_CSR(1));
+#endif
+
+#ifdef CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS3
+	/* Configure CS3 */
+	writel(AT91_SPI_NCPHA |
+	       (AT91_SPI_DLYBS & DATAFLASH_TCSS) |
+	       (AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
+	       ((AT91_MASTER_CLOCK / AT91_SPI_CLK) << 8),
+	       AT91_BASE_SPI + AT91_SPI_CSR(3));
+#endif
+
+	/* SPI_Enable */
+	writel(AT91_SPI_SPIEN, AT91_BASE_SPI + AT91_SPI_CR);
+
+	while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_SPIENS));
+
+	/*
+	 * Add tempo to get SPI in a safe state.
+	 * Should not be needed for new silicon (Rev B)
+	 */
+	udelay(500000);
+	readl(AT91_BASE_SPI + AT91_SPI_SR);
+	readl(AT91_BASE_SPI + AT91_SPI_RDR);
+
+}
+
+void AT91F_SpiEnable(int cs)
+{
+	unsigned long mode;
+
+	switch (cs) {
+	case 0:	/* Configure SPI CS0 for Serial DataFlash AT45DBxx */
+		mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
+		mode &= 0xFFF0FFFF;
+		writel(mode | ((AT91_SPI_PCS0_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
+		       AT91_BASE_SPI + AT91_SPI_MR);
+		break;
+	case 1:	/* Configure SPI CS1 for Serial DataFlash AT45DBxx */
+		mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
+		mode &= 0xFFF0FFFF;
+		writel(mode | ((AT91_SPI_PCS1_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
+		       AT91_BASE_SPI + AT91_SPI_MR);
+		break;
+	case 3:
+		mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
+		mode &= 0xFFF0FFFF;
+		writel(mode | ((AT91_SPI_PCS3_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
+		       AT91_BASE_SPI + AT91_SPI_MR);
+		break;
+	}
+
+	/* SPI_Enable */
+	writel(AT91_SPI_SPIEN, AT91_BASE_SPI + AT91_SPI_CR);
+}
+
+unsigned int AT91F_SpiWrite1(AT91PS_DataflashDesc pDesc);
+
+unsigned int AT91F_SpiWrite(AT91PS_DataflashDesc pDesc)
+{
+	unsigned int timeout;
+
+	pDesc->state = BUSY;
+
+	writel(AT91_SPI_TXTDIS + AT91_SPI_RXTDIS, AT91_BASE_SPI + AT91_SPI_PTCR);
+
+	/* Initialize the Transmit and Receive Pointer */
+	writel((unsigned int)pDesc->rx_cmd_pt, AT91_BASE_SPI + AT91_SPI_RPR);
+	writel((unsigned int)pDesc->tx_cmd_pt, AT91_BASE_SPI + AT91_SPI_TPR);
+
+	/* Intialize the Transmit and Receive Counters */
+	writel(pDesc->rx_cmd_size, AT91_BASE_SPI + AT91_SPI_RCR);
+	writel(pDesc->tx_cmd_size, AT91_BASE_SPI + AT91_SPI_TCR);
+
+	if (pDesc->tx_data_size != 0) {
+		/* Initialize the Next Transmit and Next Receive Pointer */
+		writel((unsigned int)pDesc->rx_data_pt, AT91_BASE_SPI + AT91_SPI_RNPR);
+		writel((unsigned int)pDesc->tx_data_pt, AT91_BASE_SPI + AT91_SPI_TNPR);
+
+		/* Intialize the Next Transmit and Next Receive Counters */
+		writel(pDesc->rx_data_size, AT91_BASE_SPI + AT91_SPI_RNCR);
+		writel(pDesc->tx_data_size, AT91_BASE_SPI + AT91_SPI_TNCR);
+	}
+
+	/* arm simple, non interrupt dependent timer */
+	reset_timer_masked();
+	timeout = 0;
+
+	writel(AT91_SPI_TXTEN + AT91_SPI_RXTEN, AT91_BASE_SPI + AT91_SPI_PTCR);
+	while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_RXBUFF) &&
+		((timeout = get_timer_masked()) < CONFIG_SYS_SPI_WRITE_TOUT));
+	writel(AT91_SPI_TXTDIS + AT91_SPI_RXTDIS, AT91_BASE_SPI + AT91_SPI_PTCR);
+	pDesc->state = IDLE;
+
+	if (timeout >= CONFIG_SYS_SPI_WRITE_TOUT) {
+		printf("Error Timeout\n\r");
+		return DATAFLASH_ERROR;
+	}
+
+	return DATAFLASH_OK;
+}
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 7ddb72a0e1..5523cbdd67 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -31,6 +31,7 @@ COBJS-$(CONFIG_USB_OHCI_NEW) += usb_ohci.o
 COBJS-$(CONFIG_USB_EHCI) += usb_ehci_core.o
 
 # host
+COBJS-$(CONFIG_USB_ATMEL) += atmel_usb.o
 COBJS-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
 COBJS-$(CONFIG_USB_R8A66597_HCD) += r8a66597-hcd.o
 COBJS-$(CONFIG_USB_S3C64XX) += s3c64xx_usb.o
diff --git a/drivers/usb/atmel_usb.c b/drivers/usb/atmel_usb.c
new file mode 100644
index 0000000000..7c44ad0e95
--- /dev/null
+++ b/drivers/usb/atmel_usb.c
@@ -0,0 +1,80 @@
+/*
+ * (C) Copyright 2006
+ * DENX Software Engineering <mk@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 <common.h>
+
+#if defined(CONFIG_USB_OHCI_NEW) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT)
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/io.h>
+#include <asm/arch/at91_pmc.h>
+
+int usb_cpu_init(void)
+{
+
+#if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
+    defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91SAM9G20)
+	/* Enable PLLB */
+	at91_sys_write(AT91_CKGR_PLLBR, CONFIG_SYS_AT91_PLLB);
+	while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
+		;
+#endif
+
+	/* Enable USB host clock. */
+	at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_UHP);
+#ifdef CONFIG_AT91SAM9261
+	at91_sys_write(AT91_PMC_SCER, AT91_PMC_UHP | AT91_PMC_HCK0);
+#else
+	at91_sys_write(AT91_PMC_SCER, AT91_PMC_UHP);
+#endif
+
+	return 0;
+}
+
+int usb_cpu_stop(void)
+{
+	/* Disable USB host clock. */
+	at91_sys_write(AT91_PMC_PCDR, 1 << AT91_ID_UHP);
+#ifdef CONFIG_AT91SAM9261
+	at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP | AT91_PMC_HCK0);
+#else
+	at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP);
+#endif
+
+#if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
+    defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91SAM9G20)
+	/* Disable PLLB */
+	at91_sys_write(AT91_CKGR_PLLBR, 0);
+	while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != 0)
+		;
+#endif
+
+	return 0;
+}
+
+int usb_cpu_init_fail(void)
+{
+	return usb_cpu_stop();
+}
+
+#endif /* defined(CONFIG_USB_OHCI) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT) */
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
new file mode 100644
index 0000000000..200968de4e
--- /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 0000000000..5bb8b77afc
--- /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));
+}