85xx: Add support for setting IVORs to fixed offset defaults

In future Book-E implementations IVORs will most likely go away and be
replaced with fixed offsets.  The IVPR will continue to exist to allow
for relocation of the interrupt vectors.

This code adds support to setup the IVORs as their fixed offset values
per the ISA 2.06 spec when we transition from u-boot to another OS
either via 'bootm' or a cpu release.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

cpu/mpc85xx/cpu_init.c

@@ -375,3 +375,10 @@ int cpu_init_r(void)
 #endif
 	return 0;
 }
+
+extern void setup_ivors(void);
+
+void arch_preboot_os(void)
+{
+	setup_ivors();
+}

cpu/mpc85xx/fixed_ivor.S

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2009 Freescale Semiconductor, Inc.
+ *
+ * Kumar Gala <kumar.gala@freescale.com>
+ *
+ * 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 is intended to be included by other asm code since
+ * we will want to execute this on both the primary core when
+ * it does a bootm and the secondary core's that get released
+ * out of the spin table */
+
+#define SET_IVOR(vector_number, vector_offset)	\
+	li	r3,vector_offset@l; 		\
+	mtspr	SPRN_IVOR##vector_number,r3;
+
+#define SET_GIVOR(vector_number, vector_offset)	\
+	li	r3,vector_offset@l; 		\
+	mtspr	SPRN_GIVOR##vector_number,r3;
+
+        SET_IVOR(0, 0x020) /* Critical Input */
+        SET_IVOR(1, 0x000) /* Machine Check */
+        SET_IVOR(2, 0x060) /* Data Storage */
+        SET_IVOR(3, 0x080) /* Instruction Storage */
+        SET_IVOR(4, 0x0a0) /* External Input */
+        SET_IVOR(5, 0x0c0) /* Alignment */
+        SET_IVOR(6, 0x0e0) /* Program */
+        SET_IVOR(7, 0x100) /* FP Unavailable */
+        SET_IVOR(8, 0x120) /* System Call */
+        SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
+        SET_IVOR(10, 0x160) /* Decrementer */
+        SET_IVOR(11, 0x180) /* Fixed Interval Timer */
+        SET_IVOR(12, 0x1a0) /* Watchdog Timer */
+        SET_IVOR(13, 0x1c0) /* Data TLB Error */
+        SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
+        SET_IVOR(15, 0x040) /* Debug */
+
+/* e500v1 & e500v2 only */
+#ifndef CONFIG_E500MC
+	SET_IVOR(32, 0x200) /* SPE Unavailable */
+	SET_IVOR(33, 0x220) /* Embedded FP Data */
+	SET_IVOR(34, 0x240) /* Embedded FP Round */
+#endif
+
+        SET_IVOR(35, 0x260) /* Performance monitor */
+
+/* e500mc only */
+#ifdef CONFIG_E500MC
+        SET_IVOR(36, 0x280) /* Processor doorbell */
+        SET_IVOR(37, 0x2a0) /* Processor doorbell critical */
+        SET_IVOR(38, 0x2c0) /* Guest Processor doorbell */
+        SET_IVOR(39, 0x2e0) /* Guest Processor critical & machine check */
+        SET_IVOR(40, 0x300) /* Hypervisor system call */
+        SET_IVOR(41, 0x320) /* Hypervisor Priviledge */
+
+        SET_GIVOR(2, 0x060) /* Guest Data Storage */
+        SET_GIVOR(3, 0x080) /* Guest Instruction Storage */
+        SET_GIVOR(4, 0x0a0) /* Guest External Input */
+        SET_GIVOR(8, 0x120) /* Guest System Call */
+        SET_GIVOR(13, 0x1c0) /* Guest Data TLB Error */
+        SET_GIVOR(14, 0x1e0) /* Guest Instruction TLB Error */
+#endif

cpu/mpc85xx/release.S

@@ -168,6 +168,9 @@ __secondary_start_page:
 	bne	2b
 	isync
 
+	/* setup IVORs to match fixed offsets */
+#include "fixed_ivor.S"
+
 	/* get the upper bits of the addr */
 	lwz	r11,ENTRY_ADDR_UPPER(r10)
 

cpu/mpc85xx/start.S

@@ -1122,3 +1122,9 @@ flush_dcache:
 	isync
 
 	blr
+
+.globl setup_ivors
+setup_ivors:
+
+#include "fixed_ivor.S"
+	blr

include/asm-ppc/processor.h

@@ -468,6 +468,16 @@
 #define SPRN_IVOR13	0x19d	/* Interrupt Vector Offset Register 13 */
 #define SPRN_IVOR14	0x19e	/* Interrupt Vector Offset Register 14 */
 #define SPRN_IVOR15	0x19f	/* Interrupt Vector Offset Register 15 */
+#define SPRN_IVOR38	0x1b0	/* Interrupt Vector Offset Register 38 */
+#define SPRN_IVOR39	0x1b1	/* Interrupt Vector Offset Register 39 */
+#define SPRN_IVOR40	0x1b2	/* Interrupt Vector Offset Register 40 */
+#define SPRN_IVOR41	0x1b3	/* Interrupt Vector Offset Register 41 */
+#define SPRN_GIVOR2	0x1b8	/* Guest Interrupt Vector Offset Register 2 */
+#define SPRN_GIVOR3	0x1b9	/* Guest Interrupt Vector Offset Register 3 */
+#define SPRN_GIVOR4	0x1ba	/* Guest Interrupt Vector Offset Register 4 */
+#define SPRN_GIVOR8	0x1bb	/* Guest Interrupt Vector Offset Register 8 */
+#define SPRN_GIVOR13	0x1bc	/* Guest Interrupt Vector Offset Register 13 */
+#define SPRN_GIVOR14	0x1bd	/* Guest Interrupt Vector Offset Register 14 */
 
 /* e500 definitions */
 #define SPRN_L1CFG0	0x203	/* L1 Cache Configuration Register 0 */
@@ -513,6 +523,8 @@
 #define SPRN_IVOR33	0x211	/* Interrupt Vector Offset Register 33 */
 #define SPRN_IVOR34	0x212	/* Interrupt Vector Offset Register 34 */
 #define SPRN_IVOR35	0x213	/* Interrupt Vector Offset Register 35 */
+#define SPRN_IVOR36	0x214	/* Interrupt Vector Offset Register 36 */
+#define SPRN_IVOR37	0x215	/* Interrupt Vector Offset Register 37 */
 #define SPRN_SPEFSCR	0x200	/* SPE & Embedded FP Status & Control */
 
 #define SPRN_MCSRR0	0x23a	/* Machine Check Save and Restore Register 0 */