patch-2.4.19 linux-2.4.19/arch/mips/vr4181/osprey/dbg_io.c

• Lines: 137
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/vr4181/osprey/dbg_io.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/vr4181/osprey/dbg_io.c linux-2.4.19/arch/mips/vr4181/osprey/dbg_io.c
@@ -0,0 +1,136 @@
+/*
+ * kgdb io functions for osprey.  We use the serial port on debug board.
+ *
+ * Copyright (C) 2001 MontaVista Software Inc.
+ * Author: jsun@mvista.com or jsun@junsun.net
+ *
+ * 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.
+ *
+ */
+
+/* ======================= CONFIG ======================== */
+
+/* [jsun] we use the second serial port for kdb */
+#define         BASE                    0xb7fffff0
+#define         MAX_BAUD                115200
+
+/* distance in bytes between two serial registers */
+#define         REG_OFFSET              1
+
+/*
+ * 0 - kgdb does serial init
+ * 1 - kgdb skip serial init
+ */
+static int remoteDebugInitialized = 1;
+
+/*
+ * the default baud rate *if* kgdb does serial init
+ */
+#define		BAUD_DEFAULT		UART16550_BAUD_38400
+
+/* ======================= END OF CONFIG ======================== */
+
+typedef unsigned char uint8;
+typedef unsigned int uint32;
+
+#define         UART16550_BAUD_2400             2400
+#define         UART16550_BAUD_4800             4800
+#define         UART16550_BAUD_9600             9600
+#define         UART16550_BAUD_19200            19200
+#define         UART16550_BAUD_38400            38400
+#define         UART16550_BAUD_57600            57600
+#define         UART16550_BAUD_115200           115200
+
+#define         UART16550_PARITY_NONE           0
+#define         UART16550_PARITY_ODD            0x08
+#define         UART16550_PARITY_EVEN           0x18
+#define         UART16550_PARITY_MARK           0x28
+#define         UART16550_PARITY_SPACE          0x38
+
+#define         UART16550_DATA_5BIT             0x0
+#define         UART16550_DATA_6BIT             0x1
+#define         UART16550_DATA_7BIT             0x2
+#define         UART16550_DATA_8BIT             0x3
+
+#define         UART16550_STOP_1BIT             0x0
+#define         UART16550_STOP_2BIT             0x4
+
+/* register offset */
+#define         OFS_RCV_BUFFER          0
+#define         OFS_TRANS_HOLD          0
+#define         OFS_SEND_BUFFER         0
+#define         OFS_INTR_ENABLE         (1*REG_OFFSET)
+#define         OFS_INTR_ID             (2*REG_OFFSET)
+#define         OFS_DATA_FORMAT         (3*REG_OFFSET)
+#define         OFS_LINE_CONTROL        (3*REG_OFFSET)
+#define         OFS_MODEM_CONTROL       (4*REG_OFFSET)
+#define         OFS_RS232_OUTPUT        (4*REG_OFFSET)
+#define         OFS_LINE_STATUS         (5*REG_OFFSET)
+#define         OFS_MODEM_STATUS        (6*REG_OFFSET)
+#define         OFS_RS232_INPUT         (6*REG_OFFSET)
+#define         OFS_SCRATCH_PAD         (7*REG_OFFSET)
+
+#define         OFS_DIVISOR_LSB         (0*REG_OFFSET)
+#define         OFS_DIVISOR_MSB         (1*REG_OFFSET)
+
+
+/* memory-mapped read/write of the port */
+#define         UART16550_READ(y)    (*((volatile uint8*)(BASE + y)))
+#define         UART16550_WRITE(y, z)  ((*((volatile uint8*)(BASE + y))) = z)
+
+void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
+{
+        /* disable interrupts */
+        UART16550_WRITE(OFS_INTR_ENABLE, 0);
+
+        /* set up buad rate */
+        {
+                uint32 divisor;
+
+                /* set DIAB bit */
+                UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
+
+                /* set divisor */
+                divisor = MAX_BAUD / baud;
+                UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
+                UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8);
+
+                /* clear DIAB bit */
+                UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
+        }
+
+        /* set data format */
+        UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
+}
+
+
+uint8 getDebugChar(void)
+{
+        if (!remoteDebugInitialized) {
+                remoteDebugInitialized = 1;
+                debugInit(BAUD_DEFAULT,
+                          UART16550_DATA_8BIT,
+                          UART16550_PARITY_NONE, UART16550_STOP_1BIT);
+        }
+
+        while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
+        return UART16550_READ(OFS_RCV_BUFFER);
+}
+
+
+int putDebugChar(uint8 byte)
+{
+        if (!remoteDebugInitialized) {
+                remoteDebugInitialized = 1;
+                debugInit(BAUD_DEFAULT,
+                          UART16550_DATA_8BIT,
+                          UART16550_PARITY_NONE, UART16550_STOP_1BIT);
+        }
+
+        while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0);
+        UART16550_WRITE(OFS_SEND_BUFFER, byte);
+        return 1;
+}