1 files changed, 133 insertions, 0 deletions
diff --git a/arch/mips/mti-malta/malta-kgdb.c b/arch/mips/mti-malta/malta-kgdb.c
new file mode 100644
index 00000000000..6a1854de457
--- /dev/null
+++ b/arch/mips/mti-malta/malta-kgdb.c
@@ -0,0 +1,133 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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.
+ *
+ * This is the interface to the remote debugger stub.
+ */
+#include <linux/types.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/serial_reg.h>
+
+#include <asm/serial.h>
+#include <asm/io.h>
+
+static struct serial_state rs_table[] = {
+	SERIAL_PORT_DFNS	/* Defined in serial.h */
+};
+
+static struct async_struct kdb_port_info = {0};
+
+int (*generic_putDebugChar)(char);
+char (*generic_getDebugChar)(void);
+
+static __inline__ unsigned int serial_in(struct async_struct *info, int offset)
+{
+	return inb(info->port + offset);
+}
+
+static __inline__ void serial_out(struct async_struct *info, int offset,
+				int value)
+{
+	outb(value, info->port+offset);
+}
+
+int rs_kgdb_hook(int tty_no, int speed) {
+	int t;
+	struct serial_state *ser = &rs_table[tty_no];
+
+	kdb_port_info.state = ser;
+	kdb_port_info.magic = SERIAL_MAGIC;
+	kdb_port_info.port = ser->port;
+	kdb_port_info.flags = ser->flags;
+
+	/*
+	 * Clear all interrupts
+	 */
+	serial_in(&kdb_port_info, UART_LSR);
+	serial_in(&kdb_port_info, UART_RX);
+	serial_in(&kdb_port_info, UART_IIR);
+	serial_in(&kdb_port_info, UART_MSR);
+
+	/*
+	 * Now, initialize the UART
+	 */
+	serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);	/* reset DLAB */
+	if (kdb_port_info.flags & ASYNC_FOURPORT) {
+		kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS;
+		t = UART_MCR_DTR | UART_MCR_OUT1;
+	} else {
+		kdb_port_info.MCR
+			= UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
+		t = UART_MCR_DTR | UART_MCR_RTS;
+	}
+
+	kdb_port_info.MCR = t;		/* no interrupts, please */
+	serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR);
+
+	/*
+	 * and set the speed of the serial port
+	 */
+	if (speed == 0)
+		speed = 9600;
+
+	t = kdb_port_info.state->baud_base / speed;
+	/* set DLAB */
+	serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB);
+	serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */
+	serial_out(&kdb_port_info, UART_DLM, t >> 8);  /* MS of divisor */
+	/* reset DLAB */
+	serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);
+
+	return speed;
+}
+
+int putDebugChar(char c)
+{
+	return generic_putDebugChar(c);
+}
+
+char getDebugChar(void)
+{
+	return generic_getDebugChar();
+}
+
+int rs_putDebugChar(char c)
+{
+
+	if (!kdb_port_info.state) { 	/* need to init device first */
+		return 0;
+	}
+
+	while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0)
+		;
+
+	serial_out(&kdb_port_info, UART_TX, c);
+
+	return 1;
+}
+
+char rs_getDebugChar(void)
+{
+	if (!kdb_port_info.state) { 	/* need to init device first */
+		return 0;
+	}
+
+	while (!(serial_in(&kdb_port_info, UART_LSR) & 1))
+		;
+
+	return serial_in(&kdb_port_info, UART_RX);
+}