Initial revision

2 files changed, 347 insertions, 0 deletions

diff --git a/cpu/mpc8xx/traps.c b/cpu/mpc8xx/traps.c
new file mode 100644
index 0000000..c432be6
--- /dev/null
+++ b/cpu/mpc8xx/traps.c
@@ -0,0 +1,245 @@
+/*
+ * 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)
+ *
+ * (C) Copyright 2000
+ * 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
+
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
+extern void do_bedbug_breakpoint(struct pt_regs *);
+#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);
+	switch( regs->msr & 0x0000F000)
+	{
+	case (1<<12) :
+		printf("Machine check signal - probably due to mm fault\n"
+			"with mmu off\n");
+		break;
+	case (1<<13) :
+		printf("Transfer error ack signal\n");
+		break;
+	case (1<<14) :
+		printf("Data parity signal\n");
+		break;
+	case (1<<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);
+}
+
+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;
+}
diff --git a/cpu/mpc8xx/upatch.c b/cpu/mpc8xx/upatch.c
new file mode 100644
index 0000000..99bdf53
--- /dev/null
+++ b/cpu/mpc8xx/upatch.c
@@ -0,0 +1,102 @@
+#include <common.h>
+#include <commproc.h>
+
+#if defined(CFG_I2C_UCODE_PATCH) || defined(CFG_SPI_UCODE_PATCH)
+
+static void UcodeCopy (volatile cpm8xx_t *cpm);
+
+void cpm_load_patch (volatile immap_t *immr)
+{
+	immr->im_cpm.cp_rccr &= ~0x0003;	/* Disable microcode program area */
+
+	UcodeCopy ((cpm8xx_t *)&immr->im_cpm);	/* Copy ucode patch to DPRAM   */
+#ifdef CFG_SPI_UCODE_PATCH
+    {
+	volatile spi_t *spi = (spi_t *) & immr->im_cpm.cp_dparam[PROFF_SPI];
+	/* Activate the microcode per the instructions in the microcode manual */
+	/* NOTE:  We're only relocating the SPI parameters (not I2C).          */
+	immr->im_cpm.cp_cpmcr1 = 0x802a;	/* Write Trap register 1 value */
+	immr->im_cpm.cp_cpmcr2 = 0x8028;	/* Write Trap register 2 value */
+	spi->spi_rpbase = CFG_SPI_DPMEM_OFFSET;	/* Where to relocte SPI params */
+    }
+#endif
+
+#ifdef CFG_I2C_UCODE_PATCH
+    {
+	volatile iic_t *iip = (iic_t *) & immr->im_cpm.cp_dparam[PROFF_IIC];
+	/* Activate the microcode per the instructions in the microcode manual */
+	/* NOTE:  We're only relocating the I2C parameters (not SPI).          */
+	immr->im_cpm.cp_cpmcr3 = 0x802e;	/* Write Trap register 3 value */
+	immr->im_cpm.cp_cpmcr4 = 0x802c;	/* Write Trap register 4 value */
+	iip->iic_rpbase = CFG_I2C_DPMEM_OFFSET;	/* Where to relocte I2C params */
+    }
+#endif
+
+	/*
+         * Enable DPRAM microcode to execute from the first 512 bytes
+         * and a 256 byte extension of DPRAM.
+	 */
+	immr->im_cpm.cp_rccr |= 0x0001;
+}
+
+static ulong patch_2000[] = {
+	0x7FFFEFD9, 0x3FFD0000, 0x7FFB49F7, 0x7FF90000,
+	0x5FEFADF7, 0x5F88ADF7, 0x5FEFAFF7, 0x5F88AFF7,
+	0x3A9CFBC8, 0x77CAE1BB, 0xF4DE7FAD, 0xABAE9330,
+	0x4E08FDCF, 0x6E0FAFF8, 0x7CCF76CF, 0xFDAFF9CF,
+	0xABF88DC8, 0xAB5879F7, 0xB0927383, 0xDFD079F7,
+	0xB090E6BB, 0xE5BBE74F, 0xB3FA6F0F, 0x6FFB76CE,
+	0xEE0CF9CF, 0x2BFBEFEF, 0xCFEEF9CF, 0x76CEAD23,
+	0x90B3DF99, 0x7FDDD0C1, 0x4BF847FD, 0x7CCF76CE,
+	0xCFEF77CA, 0x7EAF7FAD, 0x7DFDF0B7, 0xEF7A7FCA,
+	0x77CAFBC8, 0x6079E722, 0xFBC85FFF, 0xDFFF5FB3,
+	0xFFFBFBC8, 0xF3C894A5, 0xE7C9EDF9, 0x7F9A7FAD,
+	0x5F36AFE8, 0x5F5BFFDF, 0xDF95CB9E, 0xAF7D5FC3,
+	0xAFED8C1B, 0x5FC3AFDD, 0x5FC5DF99, 0x7EFDB0B3,
+	0x5FB3FFFE, 0xABAE5FB3, 0xFFFE5FD0, 0x600BE6BB,
+	0x600B5FD0, 0xDFC827FB, 0xEFDF5FCA, 0xCFDE3A9C,
+	0xE7C9EDF9, 0xF3C87F9E, 0x54CA7FED, 0x2D3A3637,
+	0x756F7E9A, 0xF1CE37EF, 0x2E677FEE, 0x10EBADF8,
+	0xEFDECFEA, 0xE52F7D9F, 0xE12BF1CE, 0x5F647E9A,
+	0x4DF8CFEA, 0x5F717D9B, 0xEFEECFEA, 0x5F73E522,
+	0xEFDE5F73, 0xCFDA0B61, 0x7385DF61, 0xE7C9EDF9,
+	0x7E9A30D5, 0x1458BFFF, 0xF3C85FFF, 0xDFFFA7F8,
+	0x5F5BBFFE, 0x7F7D10D0, 0x144D5F33, 0xBFFFAF78,
+	0x5F5BBFFD, 0xA7F85F33, 0xBFFE77FD, 0x30BD4E08,
+	0xFDCFE5FF, 0x6E0FAFF8, 0x7EEF7E9F, 0xFDEFF1CF,
+	0x5F17ABF8, 0x0D5B5F5B, 0xFFEF79F7, 0x309EAFDD,
+	0x5F3147F8, 0x5F31AFED, 0x7FDD50AF, 0x497847FD,
+	0x7F9E7FED, 0x7DFD70A9, 0xEF7E7ECE, 0x6BA07F9E,
+	0x2D227EFD, 0x30DB5F5B, 0xFFFD5F5B, 0xFFEF5F5B,
+	0xFFDF0C9C, 0xAFED0A9A, 0xAFDD0C37, 0x5F37AFBD,
+	0x7FBDB081, 0x5F8147F8,
+};
+
+static ulong patch_2F00[] = {
+	0x3E303430, 0x34343737, 0xABBF9B99, 0x4B4FBDBD,
+	0x59949334, 0x9FFF37FB, 0x9B177DD9, 0x936956BB,
+	0xFBDD697B, 0xDD2FD113, 0x1DB9F7BB, 0x36313963,
+	0x79373369, 0x3193137F, 0x7331737A, 0xF7BB9B99,
+	0x9BB19795, 0x77FDFD3D, 0x573B773F, 0x737933F7,
+	0xB991D115, 0x31699315, 0x31531694, 0xBF4FBDBD,
+	0x35931497, 0x35376956, 0xBD697B9D, 0x96931313,
+	0x19797937, 0x69350000,
+};
+
+static void UcodeCopy (volatile cpm8xx_t *cpm)
+{
+	vu_long *p;
+	int i;
+
+	p = (vu_long *)&(cpm->cp_dpmem[0x0000]);
+	for (i=0; i < sizeof(patch_2000)/4; ++i) {
+		p[i] = patch_2000[i];
+	}
+
+	p = (vu_long *)&(cpm->cp_dpmem[0x0F00]);
+	for (i=0; i < sizeof(patch_2F00)/4; ++i) {
+		p[i] = patch_2F00[i];
+	}
+}
+
+#endif	/* CFG_I2C_UCODE_PATCH, CFG_SPI_UCODE_PATCH */