mn10300: add the MN10300/AM33 architecture to the kernel

Add architecture support for the MN10300/AM33 CPUs produced by MEI to the
kernel.

This patch also adds board support for the ASB2303 with the ASB2308 daughter
board, and the ASB2305.  The only processor supported is the MN103E010, which
is an AM33v2 core plus on-chip devices.

[akpm@linux-foundation.org: nuke cvs control strings]
Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com>
Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 155 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/gdb-io-serial.c b/arch/mn10300/kernel/gdb-io-serial.c
new file mode 100644
index 00000000000..9a6d4e8ebe7
--- /dev/null
+++ b/arch/mn10300/kernel/gdb-io-serial.c
@@ -0,0 +1,155 @@
+/* 16550 serial driver for gdbstub I/O
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/nmi.h>
+
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/gdb-stub.h>
+#include <asm/exceptions.h>
+#include <asm/serial-regs.h>
+#include <asm/unit/serial.h>
+
+/*
+ * initialise the GDB stub
+ */
+void gdbstub_io_init(void)
+{
+	u16 tmp;
+
+	/* set up the serial port */
+	GDBPORT_SERIAL_LCR = UART_LCR_WLEN8; /* 1N8 */
+	GDBPORT_SERIAL_FCR = (UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
+			      UART_FCR_CLEAR_XMIT);
+
+	FLOWCTL_CLEAR(DTR);
+	FLOWCTL_SET(RTS);
+
+	gdbstub_io_set_baud(115200);
+
+	/* we want to get serial receive interrupts */
+	XIRQxICR(GDBPORT_SERIAL_IRQ) = 0;
+	tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
+
+	IVAR0 = EXCEP_IRQ_LEVEL0;
+	set_intr_stub(EXCEP_IRQ_LEVEL0, gdbstub_io_rx_handler);
+
+	XIRQxICR(GDBPORT_SERIAL_IRQ) &= ~GxICR_REQUEST;
+	XIRQxICR(GDBPORT_SERIAL_IRQ) = GxICR_ENABLE | GxICR_LEVEL_0;
+	tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
+
+	GDBPORT_SERIAL_IER = UART_IER_RDI | UART_IER_RLSI;
+
+	/* permit level 0 IRQs to take place */
+	asm volatile(
+		"	and %0,epsw	\n"
+		"	or %1,epsw	\n"
+		:
+		: "i"(~EPSW_IM), "i"(EPSW_IE | EPSW_IM_1)
+		);
+}
+
+/*
+ * set up the GDB stub serial port baud rate timers
+ */
+void gdbstub_io_set_baud(unsigned baud)
+{
+	unsigned value;
+	u8 lcr;
+
+	value = 18432000 / 16 / baud;
+
+	lcr = GDBPORT_SERIAL_LCR;
+	GDBPORT_SERIAL_LCR |= UART_LCR_DLAB;
+	GDBPORT_SERIAL_DLL = value & 0xff;
+	GDBPORT_SERIAL_DLM = (value >> 8) & 0xff;
+	GDBPORT_SERIAL_LCR = lcr;
+}
+
+/*
+ * wait for a character to come from the debugger
+ */
+int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
+{
+	unsigned ix;
+	u8 ch, st;
+
+	*_ch = 0xff;
+
+	if (gdbstub_rx_unget) {
+		*_ch = gdbstub_rx_unget;
+		gdbstub_rx_unget = 0;
+		return 0;
+	}
+
+ try_again:
+	/* pull chars out of the buffer */
+	ix = gdbstub_rx_outp;
+	if (ix == gdbstub_rx_inp) {
+		if (nonblock)
+			return -EAGAIN;
+#ifdef CONFIG_MN10300_WD_TIMER
+		watchdog_alert_counter = 0;
+#endif /* CONFIG_MN10300_WD_TIMER */
+		goto try_again;
+	}
+
+	ch = gdbstub_rx_buffer[ix++];
+	st = gdbstub_rx_buffer[ix++];
+	gdbstub_rx_outp = ix & 0x00000fff;
+
+	if (st & UART_LSR_BI) {
+		gdbstub_proto("### GDB Rx Break Detected ###\n");
+		return -EINTR;
+	} else if (st & (UART_LSR_FE | UART_LSR_OE | UART_LSR_PE)) {
+		gdbstub_proto("### GDB Rx Error (st=%02x) ###\n", st);
+		return -EIO;
+	} else {
+		gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n", ch, st);
+		*_ch = ch & 0x7f;
+		return 0;
+	}
+}
+
+/*
+ * send a character to the debugger
+ */
+void gdbstub_io_tx_char(unsigned char ch)
+{
+	FLOWCTL_SET(DTR);
+	LSR_WAIT_FOR(THRE);
+	/* FLOWCTL_WAIT_FOR(CTS); */
+
+	if (ch == 0x0a) {
+		GDBPORT_SERIAL_TX = 0x0d;
+		LSR_WAIT_FOR(THRE);
+		/* FLOWCTL_WAIT_FOR(CTS); */
+	}
+	GDBPORT_SERIAL_TX = ch;
+
+	FLOWCTL_CLEAR(DTR);
+}
+
+/*
+ * send a character to the debugger
+ */
+void gdbstub_io_tx_flush(void)
+{
+	LSR_WAIT_FOR(TEMT);
+	LSR_WAIT_FOR(THRE);
+	FLOWCTL_CLEAR(DTR);
+}