2 * armboot - Startup Code for ARM925 CPU-core
4 * Copyright (c) 2003 Texas Instruments
6 * ----- Adapted for OMAP1510 from ARM920 code ------
8 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
9 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
10 * Copyright (c) 2002 Gary Jennejohn <gj@denx.de>
11 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
12 * Copyright (c) 2003 Kshitij <kshitij@ti.com>
14 * See file CREDITS for list of people who contributed to this
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation; either version 2 of
20 * the License, or (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
37 #if defined(CONFIG_OMAP1510)
38 #include <./configs/omap1510.h>
42 *************************************************************************
44 * Jump vector table as in table 3.1 in [1]
46 *************************************************************************
52 ldr pc, _undefined_instruction
53 ldr pc, _software_interrupt
54 ldr pc, _prefetch_abort
60 _undefined_instruction: .word undefined_instruction
61 _software_interrupt: .word software_interrupt
62 _prefetch_abort: .word prefetch_abort
63 _data_abort: .word data_abort
64 _not_used: .word not_used
68 .balignl 16,0xdeadbeef
72 *************************************************************************
74 * Startup Code (reset vector)
76 * do important init only if we don't start from memory!
77 * setup Memory and board specific bits prior to relocation.
78 * relocate armboot to ram
81 *************************************************************************
92 * These are defined in the board-specific linker script.
102 #ifdef CONFIG_USE_IRQ
103 /* IRQ stack memory (calculated at run-time) */
104 .globl IRQ_STACK_START
108 /* IRQ stack memory (calculated at run-time) */
109 .globl FIQ_STACK_START
116 * the actual reset code
121 * set the cpu to SVC32 mode
131 mov r1, #0x81 /* Set ARM925T configuration. */
132 mcr p15, 0, r1, c15, c1, 0 /* Write ARM925T configuration register. */
135 * turn off the watchdog, unlock/diable sequence
144 * mask all IRQs by setting all bits in the INTMR - default
147 ldr r0, =REG_IHL1_MIR
149 ldr r0, =REG_IHL2_MIR
153 * wait for dpll to lock
164 * we do sys-critical inits only at reboot,
165 * not when booting from ram!
167 #ifdef CONFIG_INIT_CRITICAL
171 relocate: /* relocate U-Boot to RAM */
172 adr r0, _start /* r0 <- current position of code */
173 ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
174 cmp r0, r1 /* don't reloc during debug */
177 ldr r2, _armboot_start
179 sub r2, r3, r2 /* r2 <- size of armboot */
180 add r2, r0, r2 /* r2 <- source end address */
183 ldmia r0!, {r3-r10} /* copy from source address [r0] */
184 stmia r1!, {r3-r10} /* copy to target address [r1] */
185 cmp r0, r2 /* until source end addreee [r2] */
188 /* Set up the stack */
190 ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
191 sub r0, r0, #CFG_MALLOC_LEN /* malloc area */
192 sub r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */
193 #ifdef CONFIG_USE_IRQ
194 sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
196 sub sp, r0, #12 /* leave 3 words for abort-stack */
199 ldr r0, _bss_start /* find start of bss segment */
200 ldr r1, _bss_end /* stop here */
201 mov r2, #0x00000000 /* clear */
203 clbss_l:str r2, [r0] /* clear loop... */
208 ldr pc, _start_armboot
210 _start_armboot: .word start_armboot
214 *************************************************************************
216 * CPU_init_critical registers
218 * setup important registers
219 * setup memory timing
221 *************************************************************************
227 * flush v4 I/D caches
230 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
231 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
234 * disable MMU stuff and caches
236 mrc p15, 0, r0, c1, c0, 0
237 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
238 bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
239 orr r0, r0, #0x00000002 @ set bit 2 (A) Align
240 orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
241 mcr p15, 0, r0, c1, c0, 0
244 * Go setup Memory and board specific bits prior to relocation.
246 mov ip, lr /* perserve link reg across call */
247 bl platformsetup /* go setup pll,mux,memory */
248 mov lr, ip /* restore link */
249 mov pc, lr /* back to my caller */
251 *************************************************************************
255 *************************************************************************
261 #define S_FRAME_SIZE 72
283 #define MODE_SVC 0x13
287 * use bad_save_user_regs for abort/prefetch/undef/swi ...
288 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
291 .macro bad_save_user_regs
292 sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack
293 stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
295 ldr r2, _armboot_start
296 sub r2, r2, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
297 sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
298 ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs)
299 add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
303 stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
304 mov r0, sp @ save current stack into r0 (param register)
307 .macro irq_save_user_regs
308 sub sp, sp, #S_FRAME_SIZE
309 stmia sp, {r0 - r12} @ Calling r0-r12
310 add r8, sp, #S_PC @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
311 stmdb r8, {sp, lr}^ @ Calling SP, LR
312 str lr, [r8, #0] @ Save calling PC
314 str r6, [r8, #4] @ Save CPSR
315 str r0, [r8, #8] @ Save OLD_R0
319 .macro irq_restore_user_regs
320 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
322 ldr lr, [sp, #S_PC] @ Get PC
323 add sp, sp, #S_FRAME_SIZE
324 subs pc, lr, #4 @ return & move spsr_svc into cpsr
328 ldr r13, _armboot_start @ setup our mode stack
329 sub r13, r13, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
330 sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
332 str lr, [r13] @ save caller lr in position 0 of saved stack
333 mrs lr, spsr @ get the spsr
334 str lr, [r13, #4] @ save spsr in position 1 of saved stack
336 mov r13, #MODE_SVC @ prepare SVC-Mode
338 msr spsr, r13 @ switch modes, make sure moves will execute
339 mov lr, pc @ capture return pc
340 movs pc, lr @ jump to next instruction & switch modes.
343 .macro get_irq_stack @ setup IRQ stack
344 ldr sp, IRQ_STACK_START
347 .macro get_fiq_stack @ setup FIQ stack
348 ldr sp, FIQ_STACK_START
355 undefined_instruction:
358 bl do_undefined_instruction
364 bl do_software_interrupt
384 #ifdef CONFIG_USE_IRQ
391 irq_restore_user_regs
396 /* someone ought to write a more effiction fiq_save_user_regs */
399 irq_restore_user_regs
420 ldr r1, rstctl1 /* get clkm1 reset ctl */
421 mov r3, #0x3 /* dsp_en + arm_rst = global reset */
422 strh r3, [r1] /* force reset */