Patches by Kshitij, 04 Jul 2003

- added support for arm925t cpu core
- added support for TI OMAP 1510 Innovator Board

1 files changed, 424 insertions, 0 deletions

diff --git a/cpu/arm925t/start.S b/cpu/arm925t/start.S
new file mode 100644
index 0000000..2115fb3
--- /dev/null
+++ b/cpu/arm925t/start.S
@@ -0,0 +1,424 @@
+/*
+ *  armboot - Startup Code for ARM925 CPU-core
+ *
+ *  Copyright (c) 2003  Texas Instruments
+ *
+ *  ----- Adapted for OMAP1510 from ARM920 code ------
+ *
+ *  Copyright (c) 2001	Marius Gröger <mag@sysgo.de>
+ *  Copyright (c) 2002	Alex Züpke <azu@sysgo.de>
+ *  Copyright (c) 2002	Gary Jennejohn <gj@denx.de>
+ *  Copyright (c) 2003	Richard Woodruff <r-woodruff2@ti.com>
+ *  Copyright (c) 2003	Kshitij 	 <kshitij@ti.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
+ */
+
+
+
+#include <config.h>
+#include <version.h>
+
+#if defined(CONFIG_OMAP1510)
+#include <./configs/omap1510.h>
+#endif
+
+/*
+ *************************************************************************
+ *
+ * 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!
+ * setup Memory and board specific bits prior to relocation.
+ * relocate armboot to ram
+ * setup stack
+ *
+ *************************************************************************
+ */
+
+/*
+ * 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,#0xd3
+	msr	cpsr,r0
+	
+	/*
+	 * Set up 925T mode
+	 */
+	mov r1, #0x81               /* Set ARM925T configuration. */
+	mcr p15, 0, r1, c15, c1, 0  /* Write ARM925T configuration register. */
+
+	/* 
+	 * turn off the watchdog, unlock/diable sequence
+	 */
+	mov  r1, #0xF5
+	ldr  r0, =WDTIM_MODE
+	strh r1, [r0]
+	mov  r1, #0xA0
+	strh r1, [r0]
+
+	/*
+	 * mask all IRQs by setting all bits in the INTMR - default
+	 */
+	mov r1, #0xffffffff
+	ldr r0, =REG_IHL1_MIR
+	str r1, [r0]
+	ldr r0, =REG_IHL2_MIR
+	str r1, [r0]
+
+	/* 
+	 * wait for dpll to lock
+	 */       
+	ldr  r0, =CK_DPLL1
+	mov  r1, #0x10
+	strh r1, [r0]
+poll1:
+	ldrh r1, [r0]
+	ands r1, r1, #0x01
+	beq poll1
+	bl  cpu_init_crit
+
+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
+ *
+ *************************************************************************
+ */
+
+
+cpu_init_crit:
+	/*
+	 * 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 */
+
+	/*
+	 * disable MMU stuff and caches
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #0x00002300	@ clear bits 13, 9:8 (--V- --RS)
+	bic	r0, r0, #0x00000087	@ clear bits 7, 2:0 (B--- -CAM)
+	orr	r0, r0, #0x00000002	@ set bit 2 (A) Align
+	orr	r0, r0, #0x00001000	@ set bit 12 (I) I-Cache
+	mcr	p15, 0, r0, c1, c0, 0
+
+	/*
+	 * Go setup Memory and board specific bits prior to relocation.
+	 */
+	mov	ip, lr          /* perserve link reg across call */
+	bl	platformsetup   /* go setup pll,mux,memory */
+	mov	lr, ip          /* restore link */
+	mov	pc, lr          /* back to my caller */
+/*
+ *************************************************************************
+ *
+ * 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           @ carve out a frame on current user stack
+	stmia	sp, {r0 - r12}			@ Save user registers (now in svc mode) r0-r12
+
+	ldr	r2, _armboot_end                @ find top of stack
+	add	r2, r2, #CONFIG_STACKSIZE       @ find base of normal stack
+	sub	r2, r2, #8                      @ set base 2 words into abort stack
+	ldmia	r2, {r2 - r3}                   @ get values for "aborted" pc and cpsr (into parm regs)
+	add	r0, sp, #S_FRAME_SIZE		@ grab pointer to old stack
+
+	add	r5, sp, #S_SP
+	mov	r1, lr
+	stmia	r5, {r0 - r3}                   @ save sp_SVC, lr_SVC, pc, cpsr
+	mov	r0, sp                          @ save current stack into r0 (param register)
+	.endm
+
+	.macro	irq_save_user_regs
+	sub	sp, sp, #S_FRAME_SIZE
+	stmia	sp, {r0 - r12}			@ Calling r0-r12
+	add     r8, sp, #S_PC                   @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
+	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		@ get bottom of stack (into sp by by user stack pointer).
+	add	r13, r13, #CONFIG_STACKSIZE	@ head to reserved words at the top of the stack
+	sub	r13, r13, #8                    @ reserved a couple spots in abort stack
+
+	str	lr, [r13]			@ save caller lr in position 0 of saved stack
+	mrs	lr, spsr                        @ get the spsr
+	str     lr, [r13, #4]                   @ save spsr in position 1 of saved stack
+
+	mov	r13, #MODE_SVC			@ prepare SVC-Mode
+	@ msr	spsr_c, r13
+	msr	spsr, r13                       @ switch modes, make sure moves will execute
+	mov	lr, pc                          @ capture return pc
+	movs	pc, lr                          @ jump to next instruction & switch modes.
+	.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	r1, rstctl1     /* get clkm1 reset ctl */
+	mov     r3, #0x0        
+	strh	r3, [r1]        /* clear it */
+	mov     r3, #0x8
+	strh    r3, [r1]        /* force dsp+arm reset */
+_loop_forever:
+	b	_loop_forever
+rstctl1:
+	.word	0xfffece10