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-rw-r--r--arch/mips/alchemy/common/puts.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/puts.c b/arch/mips/alchemy/common/puts.c
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+++ b/arch/mips/alchemy/common/puts.c
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+/*
+ *
+ * BRIEF MODULE DESCRIPTION
+ * Low level UART routines to directly access Alchemy UART.
+ *
+ * Copyright 2001, 2008 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc. <source@mvista.com>
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <asm/mach-au1x00/au1000.h>
+
+#define SERIAL_BASE UART_BASE
+#define SER_CMD 0x7
+#define SER_DATA 0x1
+#define TX_BUSY 0x20
+
+#define TIMEOUT 0xffffff
+#define SLOW_DOWN
+
+static volatile unsigned long * const com1 = (unsigned long *)SERIAL_BASE;
+
+#ifdef SLOW_DOWN
+static inline void slow_down(void)
+{
+ int k;
+
+ for (k = 0; k < 10000; k++);
+}
+#else
+#define slow_down()
+#endif
+
+void
+prom_putchar(const unsigned char c)
+{
+ unsigned char ch;
+ int i = 0;
+
+ do {
+ ch = com1[SER_CMD];
+ slow_down();
+ i++;
+ if (i > TIMEOUT)
+ break;
+ } while (0 == (ch & TX_BUSY));
+
+ com1[SER_DATA] = c;
+}