arm920t/at91: add at91rm9200_devices.c

This is a copy of arm926ejs/at91 api for perpherial initialisation.
At the moment we just need the usart part of the api.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

2 files changed, 86 insertions, 0 deletions

diff --git a/arch/arm/cpu/arm920t/at91/Makefile b/arch/arm/cpu/arm920t/at91/Makefile
index 4417dfe..309bcd6 100644
--- a/arch/arm/cpu/arm920t/at91/Makefile
+++ b/arch/arm/cpu/arm920t/at91/Makefile
@@ -30,6 +30,7 @@ COBJS	+= reset.o
 COBJS	+= timer.o
 COBJS	+= clock.o
 COBJS	+= cpu.o
+COBJS	+= at91rm9200_devices.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/arch/arm/cpu/arm920t/at91/at91rm9200_devices.c b/arch/arm/cpu/arm920t/at91/at91rm9200_devices.c
new file mode 100644
index 0000000..f610a1e
--- /dev/null
+++ b/arch/arm/cpu/arm920t/at91/at91rm9200_devices.c
@@ -0,0 +1,85 @@
+/*
+ * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
+ *
+ * (C) Copyright 2011
+ * Andreas Bießmann <andreas.devel@googlemail.com>
+ *
+ * (C) Copyright 2007-2008
+ * Stelian Pop <stelian.pop@leadtechdesign.com>
+ * Lead Tech Design <www.leadtechdesign.com>
+ *
+ * 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/arch/at91_common.h>
+#include <asm/arch/at91_pmc.h>
+#include <asm/arch/gpio.h>
+
+/*
+ * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
+ * peripheral pins. Good to have if hardware is soldered optionally
+ * or in case of SPI no slave is selected. Avoid lines to float
+ * needlessly. Use a short local PUP define.
+ *
+ * Due to errata "TXD floats when CTS is inactive" pullups are always
+ * on for TXD pins.
+ */
+#ifdef CONFIG_AT91_GPIO_PULLUP
+# define PUP CONFIG_AT91_GPIO_PULLUP
+#else
+# define PUP 0
+#endif
+
+void at91_serial0_hw_init(void)
+{
+	at91_pmc_t	*pmc	= (at91_pmc_t *)ATMEL_BASE_PMC;
+
+	at91_set_a_periph(AT91_PIO_PORTA, 17, 1);		/* TXD0 */
+	at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);		/* RXD0 */
+	writel(1 << ATMEL_ID_USART0, &pmc->pcer);
+}
+
+void at91_serial1_hw_init(void)
+{
+	at91_pmc_t	*pmc	= (at91_pmc_t *)ATMEL_BASE_PMC;
+
+	at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);		/* RXD1 */
+	at91_set_a_periph(AT91_PIO_PORTB, 21, 1);		/* TXD1 */
+	writel(1 << ATMEL_ID_USART1, &pmc->pcer);
+}
+
+void at91_serial2_hw_init(void)
+{
+	at91_pmc_t	*pmc	= (at91_pmc_t *)ATMEL_BASE_PMC;
+
+	at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);		/* RXD2 */
+	at91_set_a_periph(AT91_PIO_PORTA, 23, 1);		/* TXD2 */
+	writel(1 << ATMEL_ID_USART2, &pmc->pcer);
+}
+
+
+void at91_seriald_hw_init(void)
+{
+	at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);		/* DRXD */
+	at91_set_a_periph(AT91_PIO_PORTA, 31, 1);		/* DTXD */
+	/* writing SYS to PCER has no effect on AT91RM9200 */
+}
+