Initial revision

1 files changed, 422 insertions, 0 deletions

diff --git a/cpu/sa1100/start.S b/cpu/sa1100/start.S
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+/*
+ *  armboot - Startup Code for SA1100 CPU
+ *
+ *  Copyright (C) 1998	Dan Malek <dmalek@jlc.net>
+ *  Copyright (C) 1999	Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
+ *  Copyright (C) 2000	Wolfgang Denk <wd@denx.de>
+ *  Copyright (c) 2001	Alex Züpke <azu@sysgo.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
+ */
+
+
+
+#include <config.h>
+#include <version.h>
+
+
+/*
+ *************************************************************************
+ *
+ * Jump vector table as in table 3.1 in [1]
+ *
+ *************************************************************************
+ */
+
+
+.globl _start
+_start:	b       reset
+	ldr	pc, _undefined_instruction
+	ldr	pc, _software_interrupt
+	ldr	pc, _prefetch_abort
+	ldr	pc, _data_abort
+	ldr	pc, _not_used
+	ldr	pc, _irq
+	ldr	pc, _fiq
+
+_undefined_instruction:	.word undefined_instruction
+_software_interrupt:	.word software_interrupt
+_prefetch_abort:	.word prefetch_abort
+_data_abort:		.word data_abort
+_not_used:		.word not_used
+_irq:			.word irq
+_fiq:			.word fiq
+
+	.balignl 16,0xdeadbeef
+
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * relocate armboot to ram
+ * setup stack
+ * jump to second stage
+ *
+ *************************************************************************
+ */
+
+/*
+ * CFG_MEM_END is in the board dependent config-file (configs/config_BOARD.h)
+ */
+_TEXT_BASE:
+	.word	TEXT_BASE
+
+.globl _armboot_start
+_armboot_start:
+	.word _start
+
+/*
+ * Note: _armboot_end_data and _armboot_end are defined
+ * by the (board-dependent) linker script.
+ * _armboot_end_data is the first usable FLASH address after armboot
+ */
+.globl _armboot_end_data
+_armboot_end_data:
+	.word armboot_end_data
+.globl _armboot_end
+_armboot_end:
+	.word armboot_end
+
+/*
+ * _armboot_real_end is the first usable RAM address behind armboot
+ * and the various stacks
+ */
+.globl _armboot_real_end
+_armboot_real_end:
+	.word 0x0badc0de
+
+#ifdef CONFIG_USE_IRQ
+/* IRQ stack memory (calculated at run-time) */
+.globl IRQ_STACK_START
+IRQ_STACK_START:
+	.word	0x0badc0de
+
+/* IRQ stack memory (calculated at run-time) */
+.globl FIQ_STACK_START
+FIQ_STACK_START:
+	.word 0x0badc0de
+#endif
+
+
+/*
+ * the actual reset code
+ */
+
+reset:
+	/*
+	 * set the cpu to SVC32 mode
+	 */
+	mrs	r0,cpsr
+	bic	r0,r0,#0x1f
+	orr	r0,r0,#0x13
+	msr	cpsr,r0
+
+	/*
+	 * we do sys-critical inits only at reboot,
+	 * not when booting from ram!
+	 */
+#ifdef CONFIG_INIT_CRITICAL
+	bl	cpu_init_crit
+#endif
+
+relocate:
+	/*
+	 * relocate armboot to RAM
+	 */
+	adr	r0, _start		/* r0 <- current position of code */
+	ldr	r2, _armboot_start
+	ldr	r3, _armboot_end
+	sub	r2, r3, r2		/* r2 <- size of armboot */
+	ldr	r1, _TEXT_BASE		/* r1 <- destination address */
+	add	r2, r0, r2		/* r2 <- source end address */
+
+	/*
+	 * r0 = source address
+	 * r1 = target address
+	 * r2 = source end address
+	 */
+copy_loop:
+	ldmia	r0!, {r3-r10}
+	stmia	r1!, {r3-r10}
+	cmp	r0, r2
+	ble	copy_loop
+
+	/* set up the stack */
+	ldr	r0, _armboot_end
+	add	r0, r0, #CONFIG_STACKSIZE
+	sub	sp, r0, #12		/* leave 3 words for abort-stack */
+
+	ldr	pc, _start_armboot
+
+_start_armboot:	.word start_armboot
+
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+
+
+/* Interupt-Controller base address */
+IC_BASE:	.word	0x90050000
+#define ICMR	0x04
+
+
+/* Reset-Controller */
+RST_BASE:		.word   0x90030000
+#define RSRR	0x00
+#define RCSR	0x04
+
+
+/* PWR */
+PWR_BASE:		.word   0x90020000
+#define PSPR    0x08
+#define PPCR    0x14
+cpuspeed:		.word   CFG_CPUSPEED
+
+
+cpu_init_crit:
+	/*
+	 * mask all IRQs
+	 */
+	ldr	r0, IC_BASE
+	mov	r1, #0x00
+	str	r1, [r0, #ICMR]
+
+	/* set clock speed */
+	ldr	r0, PWR_BASE
+	ldr	r1, cpuspeed
+	str	r1, [r0, #PPCR]
+
+	/*
+	 * before relocating, we have to setup RAM timing
+	 * because memory timing is board-dependend, you will
+	 * find a memsetup.S in your board directory.
+	 */
+	mov	ip,	lr
+	bl	memsetup
+	mov	lr,	ip
+
+	/*
+	 * disable MMU stuff and enable I-cache
+	 */
+	mrc	p15,0,r0,c1,c0
+	bic	r0, r0, #0x00002000	@ clear bit 13 (X)
+	bic	r0, r0, #0x0000000f	@ clear bits 3-0 (WCAM)
+	orr	r0, r0, #0x00001000	@ set bit 12 (I) Icache
+	orr	r0, r0, #0x00000002	@ set bit 2 (A) Align
+	mcr	p15,0,r0,c1,c0
+
+	/*
+	 * flush v4 I/D caches
+	 */
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c7, 0	/* flush v3/v4 cache */
+	mcr	p15, 0, r0, c8, c7, 0	/* flush v4 TLB */
+
+	mov	pc, lr
+
+
+
+
+/*
+ *************************************************************************
+ *
+ * Interrupt handling
+ *
+ *************************************************************************
+ */
+
+@
+@ IRQ stack frame.
+@
+#define S_FRAME_SIZE	72
+
+#define S_OLD_R0	68
+#define S_PSR		64
+#define S_PC		60
+#define S_LR		56
+#define S_SP		52
+
+#define S_IP		48
+#define S_FP		44
+#define S_R10		40
+#define S_R9		36
+#define S_R8		32
+#define S_R7		28
+#define S_R6		24
+#define S_R5		20
+#define S_R4		16
+#define S_R3		12
+#define S_R2		8
+#define S_R1		4
+#define S_R0		0
+
+#define MODE_SVC 0x13
+#define I_BIT	 0x80
+
+/*
+ * use bad_save_user_regs for abort/prefetch/undef/swi ...
+ * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
+ */
+
+	.macro	bad_save_user_regs
+	sub	sp, sp, #S_FRAME_SIZE
+	stmia	sp, {r0 - r12}			@ Calling r0-r12
+	add     r8, sp, #S_PC
+
+	ldr	r2, _armboot_end
+	add	r2, r2, #CONFIG_STACKSIZE
+	sub	r2, r2, #8
+	ldmia	r2, {r2 - r4}                   @ get pc, cpsr, old_r0
+	add	r0, sp, #S_FRAME_SIZE		@ restore sp_SVC
+
+	add	r5, sp, #S_SP
+	mov	r1, lr
+	stmia	r5, {r0 - r4}                   @ save sp_SVC, lr_SVC, pc, cpsr, old_r
+	mov	r0, sp
+	.endm
+
+	.macro	irq_save_user_regs
+	sub	sp, sp, #S_FRAME_SIZE
+	stmia	sp, {r0 - r12}			@ Calling r0-r12
+	add     r8, sp, #S_PC
+	stmdb   r8, {sp, lr}^                   @ Calling SP, LR
+	str     lr, [r8, #0]                    @ Save calling PC
+	mrs     r6, spsr
+	str     r6, [r8, #4]                    @ Save CPSR
+	str     r0, [r8, #8]                    @ Save OLD_R0
+	mov	r0, sp
+	.endm
+
+	.macro	irq_restore_user_regs
+	ldmia	sp, {r0 - lr}^			@ Calling r0 - lr
+	mov	r0, r0
+	ldr	lr, [sp, #S_PC]			@ Get PC
+	add	sp, sp, #S_FRAME_SIZE
+	subs	pc, lr, #4			@ return & move spsr_svc into cpsr
+	.endm
+
+	.macro get_bad_stack
+	ldr	r13, _armboot_end		@ setup our mode stack
+	add	r13, r13, #CONFIG_STACKSIZE	@ resides at top of normal stack
+	sub	r13, r13, #8
+
+	str	lr, [r13]			@ save caller lr / spsr
+	mrs	lr, spsr
+	str     lr, [r13, #4]
+
+	mov	r13, #MODE_SVC			@ prepare SVC-Mode
+	msr	spsr_c, r13
+	mov	lr, pc
+	movs	pc, lr
+	.endm
+
+	.macro get_irq_stack			@ setup IRQ stack
+	ldr	sp, IRQ_STACK_START
+	.endm
+
+	.macro get_fiq_stack			@ setup FIQ stack
+	ldr	sp, FIQ_STACK_START
+	.endm
+
+/*
+ * exception handlers
+ */
+	.align  5
+undefined_instruction:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_undefined_instruction
+
+	.align	5
+software_interrupt:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_software_interrupt
+
+	.align	5
+prefetch_abort:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_prefetch_abort
+
+	.align	5
+data_abort:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_data_abort
+
+	.align	5
+not_used:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_not_used
+
+#ifdef CONFIG_USE_IRQ
+
+	.align	5
+irq:
+	get_irq_stack
+	irq_save_user_regs
+	bl 	do_irq
+	irq_restore_user_regs
+
+	.align	5
+fiq:
+	get_fiq_stack
+	/* someone ought to write a more effiction fiq_save_user_regs */
+	irq_save_user_regs
+	bl 	do_fiq
+	irq_restore_user_regs
+
+#else
+
+	.align	5
+irq:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_irq
+
+	.align	5
+fiq:
+	get_bad_stack
+	bad_save_user_regs
+	bl 	do_fiq
+
+#endif
+
+	.align	5
+.globl reset_cpu
+reset_cpu:
+	ldr	r0, RST_BASE
+	mov	r1, #0x0			@ set bit 3-0 ...
+	str	r1, [r0, #RCSR]			@ ... to clear in RCSR
+	mov	r1, #0x1
+	str	r1, [r0, #RSRR]			@ and perform reset
+	b	reset_cpu			@ silly, but repeat endlessly