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Diffstat (limited to 'drivers/serial/at91rm9200_usart.c')
-rw-r--r--drivers/serial/at91rm9200_usart.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/serial/at91rm9200_usart.c b/drivers/serial/at91rm9200_usart.c
new file mode 100644
index 0000000..858bde9
--- /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);
+}