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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/vr4181/osprey/dbg_io.c
downloadlinux-stericsson-9e734775f7c22d2f89943ad6c745571f1930105f.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/mips/vr4181/osprey/dbg_io.c')
-rw-r--r--arch/mips/vr4181/osprey/dbg_io.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/arch/mips/vr4181/osprey/dbg_io.c b/arch/mips/vr4181/osprey/dbg_io.c
new file mode 100644
index 000000000000..5e8a84072d5b
--- /dev/null
+++ b/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;
+}