Patch by TsiChung Liew, 23 Sep 2004:

- add support for MPC8220 CPU
- Add support for Alaska and Yukon boards

1 files changed, 239 insertions, 0 deletions

diff --git a/cpu/mpc8220/traps.c b/cpu/mpc8220/traps.c
new file mode 100644
index 0000000..cdee2be
--- /dev/null
+++ b/cpu/mpc8220/traps.c
@@ -0,0 +1,239 @@
+/*
+ * linux/arch/ppc/kernel/traps.c
+ *
+ * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
+ *
+ * Modified by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras (paulus@cs.anu.edu.au)
+ * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
+ *
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 program is distributed in the hope that 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 file handles the architecture-dependent parts of hardware exceptions
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+int (*debugger_exception_handler) (struct pt_regs *) = 0;
+#endif
+
+/* Returns 0 if exception not found and fixup otherwise.  */
+extern unsigned long search_exception_table (unsigned long);
+
+/* THIS NEEDS CHANGING to use the board info structure.
+*/
+#define END_OF_MEM      0x02000000
+
+/*
+ * Trap & Exception support
+ */
+
+void print_backtrace (unsigned long *sp)
+{
+	int cnt = 0;
+	unsigned long i;
+
+	printf ("Call backtrace: ");
+	while (sp) {
+		if ((uint) sp > END_OF_MEM)
+			break;
+
+		i = sp[1];
+		if (cnt++ % 7 == 0)
+			printf ("\n");
+		printf ("%08lX ", i);
+		if (cnt > 32)
+			break;
+		sp = (unsigned long *) *sp;
+	}
+	printf ("\n");
+}
+
+void show_regs (struct pt_regs *regs)
+{
+	int i;
+
+	printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
+		regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
+	printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
+		regs->msr,
+		regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
+		regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0,
+		regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0);
+
+	printf ("\n");
+	for (i = 0; i < 32; i++) {
+		if ((i % 8) == 0) {
+			printf ("GPR%02d: ", i);
+		}
+
+		printf ("%08lX ", regs->gpr[i]);
+		if ((i % 8) == 7) {
+			printf ("\n");
+		}
+	}
+}
+
+
+void _exception (int signr, struct pt_regs *regs)
+{
+	show_regs (regs);
+	print_backtrace ((unsigned long *) regs->gpr[1]);
+	panic ("Exception in kernel pc %lx signal %d", regs->nip, signr);
+}
+
+void MachineCheckException (struct pt_regs *regs)
+{
+	unsigned long fixup;
+
+	/* Probing PCI using config cycles cause this exception
+	 * when a device is not present.  Catch it and return to
+	 * the PCI exception handler.
+	 */
+	if ((fixup = search_exception_table (regs->nip)) != 0) {
+		regs->nip = fixup;
+		return;
+	}
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+	if (debugger_exception_handler
+	    && (*debugger_exception_handler) (regs))
+		return;
+#endif
+
+	printf ("Machine check in kernel mode.\n");
+	printf ("Caused by (from msr): ");
+	printf ("regs %p ", regs);
+	/* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
+	switch (regs->msr & 0x000F0000) {
+	case (0x80000000 >> 12):
+		printf ("Machine check signal - probably due to mm fault\n"
+			"with mmu off\n");
+		break;
+	case (0x80000000 >> 13):
+		printf ("Transfer error ack signal\n");
+		break;
+	case (0x80000000 >> 14):
+		printf ("Data parity signal\n");
+		break;
+	case (0x80000000 >> 15):
+		printf ("Address parity signal\n");
+		break;
+	default:
+		printf ("Unknown values in msr\n");
+	}
+	show_regs (regs);
+	print_backtrace ((unsigned long *) regs->gpr[1]);
+	panic ("machine check");
+}
+
+void AlignmentException (struct pt_regs *regs)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+	if (debugger_exception_handler
+	    && (*debugger_exception_handler) (regs))
+		return;
+#endif
+	show_regs (regs);
+	print_backtrace ((unsigned long *) regs->gpr[1]);
+	panic ("Alignment Exception");
+}
+
+void ProgramCheckException (struct pt_regs *regs)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+	if (debugger_exception_handler
+	    && (*debugger_exception_handler) (regs))
+		return;
+#endif
+	show_regs (regs);
+	print_backtrace ((unsigned long *) regs->gpr[1]);
+	panic ("Program Check Exception");
+}
+
+void SoftEmuException (struct pt_regs *regs)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+	if (debugger_exception_handler
+	    && (*debugger_exception_handler) (regs))
+		return;
+#endif
+	show_regs (regs);
+	print_backtrace ((unsigned long *) regs->gpr[1]);
+	panic ("Software Emulation Exception");
+}
+
+
+void UnknownException (struct pt_regs *regs)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+	if (debugger_exception_handler
+	    && (*debugger_exception_handler) (regs))
+		return;
+#endif
+	printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
+		regs->nip, regs->msr, regs->trap);
+	_exception (0, regs);
+}
+
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
+extern void do_bedbug_breakpoint (struct pt_regs *);
+#endif
+
+void DebugException (struct pt_regs *regs)
+{
+
+	printf ("Debugger trap at @ %lx\n", regs->nip);
+	show_regs (regs);
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
+	do_bedbug_breakpoint (regs);
+#endif
+}
+
+/* Probe an address by reading.  If not present, return -1, otherwise
+ * return 0.
+ */
+int addr_probe (uint * addr)
+{
+#if 0
+	int retval;
+
+	__asm__ __volatile__ ("1: lwz %0,0(%1)\n"
+			      "   eieio\n"
+			      "   li %0,0\n"
+			      "2:\n"
+			      ".section .fixup,\"ax\"\n"
+			      "3: li %0,-1\n"
+			      "   b 2b\n"
+			      ".section __ex_table,\"a\"\n"
+			      "   .align 2\n"
+			      "   .long 1b,3b\n"
+			      ".text":"=r" (retval):"r" (addr));
+
+	return (retval);
+#endif
+	return 0;
+}