summaryrefslogtreecommitdiff
path: root/cpu/pxa/serial.c
diff options
context:
space:
mode:
authorwdenk <wdenk>2003-05-23 12:36:20 +0000
committerwdenk <wdenk>2003-05-23 12:36:20 +0000
commit4c3b21a5f915988e3d9681cf9cb566bb7bd56859 (patch)
tree2ed1d16a43a353157b47aed11c6312a2caa76d82 /cpu/pxa/serial.c
parentd9ff6e84e49cd95323172e6a70a21b7a5c879901 (diff)
downloadu-boot-imx-4c3b21a5f915988e3d9681cf9cb566bb7bd56859.zip
u-boot-imx-4c3b21a5f915988e3d9681cf9cb566bb7bd56859.tar.gz
u-boot-imx-4c3b21a5f915988e3d9681cf9cb566bb7bd56859.tar.bz2
Patch by Kyle Harris, 20 May 2003:
In preparation for an ixp port, rename cpu/xscale and arch-xscale into cpu/pxa and arch-pxa.
Diffstat (limited to 'cpu/pxa/serial.c')
-rw-r--r--cpu/pxa/serial.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/cpu/pxa/serial.c b/cpu/pxa/serial.c
new file mode 100644
index 0000000..c9d5f70
--- /dev/null
+++ b/cpu/pxa/serial.c
@@ -0,0 +1,166 @@
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
+ *
+ * (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/arch/pxa-regs.h>
+
+void serial_setbrg (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ unsigned int quot = 0;
+
+ if (gd->baudrate == 1200)
+ quot = 192;
+ else if (gd->baudrate == 9600)
+ quot = 96;
+ else if (gd->baudrate == 19200)
+ quot = 48;
+ else if (gd->baudrate == 38400)
+ quot = 24;
+ else if (gd->baudrate == 57600)
+ quot = 16;
+ else if (gd->baudrate == 115200)
+ quot = 8;
+ else
+ hang ();
+
+#ifdef CONFIG_FFUART
+
+ CKEN |= CKEN6_FFUART;
+
+ FFIER = 0; /* Disable for now */
+ FFFCR = 0; /* No fifos enabled */
+
+ /* set baud rate */
+ FFLCR = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
+ FFDLL = quot & 0xff;
+ FFDLH = quot >> 8;
+ FFLCR = LCR_WLS0 | LCR_WLS1;
+
+ FFIER = IER_UUE; /* Enable FFUART */
+
+#elif defined(CONFIG_BTUART)
+ CKEN |= CKEN7_BTUART;
+
+ BTIER = 0;
+ BTFCR = 0;
+
+ /* set baud rate */
+ BTLCR = LCR_DLAB;
+ BTDLL = quot & 0xff;
+ BTDLH = quot >> 8;
+ BTLCR = LCR_WLS0 | LCR_WLS1;
+
+ BTIER = IER_UUE; /* Enable BFUART */
+
+#elif defined(CONFIG_STUART)
+#error "Bad: not implemented yet!"
+#else
+#error "Bad: you didn't configured serial ..."
+#endif
+}
+
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ *
+ */
+int serial_init (void)
+{
+ serial_setbrg ();
+
+ return (0);
+}
+
+
+/*
+ * Output a single byte to the serial port.
+ */
+void serial_putc (const char c)
+{
+#ifdef CONFIG_FFUART
+ /* wait for room in the tx FIFO on FFUART */
+ while ((FFLSR & LSR_TEMT) == 0);
+
+ FFTHR = c;
+#elif defined(CONFIG_BTUART)
+ while ((BTLSR & LSR_TEMT ) == 0 );
+ BTTHR = c;
+#elif defined(CONFIG_STUART)
+#endif
+
+ /* If \n, also do \r */
+ if (c == '\n')
+ serial_putc ('\r');
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+int serial_tstc (void)
+{
+#ifdef CONFIG_FFUART
+ return FFLSR & LSR_DR;
+#elif defined(CONFIG_BTUART)
+ return BTLSR & LSR_DR;
+#elif defined(CONFIG_STUART)
+#endif
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+int serial_getc (void)
+{
+#ifdef CONFIG_FFUART
+ while (!(FFLSR & LSR_DR));
+
+ return (char) FFRBR & 0xff;
+#elif defined(CONFIG_BTUART)
+ while (!(BTLSR & LSR_DR));
+
+ return (char) BTRBR & 0xff;
+#elif defined(CONFIG_STUART)
+#endif
+}
+
+void
+serial_puts (const char *s)
+{
+ while (*s) {
+ serial_putc (*s++);
+ }
+}