184ad6884SPeter Tyser/* 220f7b1b7SMarek Vasut * armboot - Startup Code for XScale CPU-core 384ad6884SPeter Tyser * 484ad6884SPeter Tyser * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> 584ad6884SPeter Tyser * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> 684ad6884SPeter Tyser * Copyright (C) 2000 Wolfgang Denk <wd@denx.de> 784ad6884SPeter Tyser * Copyright (C) 2001 Alex Zuepke <azu@sysgo.de> 820f7b1b7SMarek Vasut * Copyright (C) 2001 Marius Groger <mag@sysgo.de> 920f7b1b7SMarek Vasut * Copyright (C) 2002 Alex Zupke <azu@sysgo.de> 1020f7b1b7SMarek Vasut * Copyright (C) 2002 Gary Jennejohn <garyj@denx.de> 1184ad6884SPeter Tyser * Copyright (C) 2002 Kyle Harris <kharris@nexus-tech.net> 1284ad6884SPeter Tyser * Copyright (C) 2003 Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de> 1320f7b1b7SMarek Vasut * Copyright (C) 2003 Kshitij <kshitij@ti.com> 1420f7b1b7SMarek Vasut * Copyright (C) 2003 Richard Woodruff <r-woodruff2@ti.com> 1520f7b1b7SMarek Vasut * Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de> 1620f7b1b7SMarek Vasut * Copyright (C) 2004 Texas Instruments <r-woodruff2@ti.com> 1720f7b1b7SMarek Vasut * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> 1884ad6884SPeter Tyser * 191a459660SWolfgang Denk * SPDX-License-Identifier: GPL-2.0+ 2084ad6884SPeter Tyser */ 2184ad6884SPeter Tyser 2225ddd1fbSWolfgang Denk#include <asm-offsets.h> 2384ad6884SPeter Tyser#include <config.h> 2484ad6884SPeter Tyser#include <version.h> 257f4cfcf4SMarek Vasut 2684ad6884SPeter Tyser/* 2720f7b1b7SMarek Vasut ************************************************************************* 2820f7b1b7SMarek Vasut * 2984ad6884SPeter Tyser * Startup Code (reset vector) 3084ad6884SPeter Tyser * 3120f7b1b7SMarek Vasut * do important init only if we don't start from memory! 3220f7b1b7SMarek Vasut * setup Memory and board specific bits prior to relocation. 3320f7b1b7SMarek Vasut * relocate armboot to ram 3420f7b1b7SMarek Vasut * setup stack 3520f7b1b7SMarek Vasut * 3620f7b1b7SMarek Vasut ************************************************************************* 3784ad6884SPeter Tyser */ 3884ad6884SPeter Tyser 39*41623c91SAlbert ARIBAUD .globl reset 405347f68cSHeiko Schocher 415347f68cSHeiko Schocherreset: 425347f68cSHeiko Schocher /* 435347f68cSHeiko Schocher * set the cpu to SVC32 mode 445347f68cSHeiko Schocher */ 455347f68cSHeiko Schocher mrs r0,cpsr 465347f68cSHeiko Schocher bic r0,r0,#0x1f 475347f68cSHeiko Schocher orr r0,r0,#0xd3 485347f68cSHeiko Schocher msr cpsr,r0 495347f68cSHeiko Schocher 5020f7b1b7SMarek Vasut#ifndef CONFIG_SKIP_LOWLEVEL_INIT 5120f7b1b7SMarek Vasut bl cpu_init_crit 5220f7b1b7SMarek Vasut#endif 535347f68cSHeiko Schocher 54abc20abaSMarek Vasut#ifdef CONFIG_CPU_PXA25X 557f4cfcf4SMarek Vasut bl lock_cache_for_stack 567f4cfcf4SMarek Vasut#endif 577f4cfcf4SMarek Vasut 58e05e5de7SAlbert ARIBAUD bl _main 595347f68cSHeiko Schocher 605347f68cSHeiko Schocher/*------------------------------------------------------------------------------*/ 61e05e5de7SAlbert ARIBAUD 62e05e5de7SAlbert ARIBAUD .globl c_runtime_cpu_setup 63e05e5de7SAlbert ARIBAUDc_runtime_cpu_setup: 64e05e5de7SAlbert ARIBAUD 653da0e575SAlbert ARIBAUD#ifdef CONFIG_CPU_PXA25X 663da0e575SAlbert ARIBAUD /* 673da0e575SAlbert ARIBAUD * Unlock (actually, disable) the cache now that board_init_f 683da0e575SAlbert ARIBAUD * is done. We could do this earlier but we would need to add 693da0e575SAlbert ARIBAUD * a new C runtime hook, whereas c_runtime_cpu_setup already 703da0e575SAlbert ARIBAUD * exists. 713da0e575SAlbert ARIBAUD * As this routine is just a call to cpu_init_crit, let us 723da0e575SAlbert ARIBAUD * tail-optimize and do a simple branch here. 733da0e575SAlbert ARIBAUD */ 743da0e575SAlbert ARIBAUD b cpu_init_crit 753da0e575SAlbert ARIBAUD#else 76e05e5de7SAlbert ARIBAUD bx lr 773da0e575SAlbert ARIBAUD#endif 78e05e5de7SAlbert ARIBAUD 7920f7b1b7SMarek Vasut/* 8020f7b1b7SMarek Vasut ************************************************************************* 8120f7b1b7SMarek Vasut * 8220f7b1b7SMarek Vasut * CPU_init_critical registers 8320f7b1b7SMarek Vasut * 8420f7b1b7SMarek Vasut * setup important registers 8520f7b1b7SMarek Vasut * setup memory timing 8620f7b1b7SMarek Vasut * 8720f7b1b7SMarek Vasut ************************************************************************* 8820f7b1b7SMarek Vasut */ 89abc20abaSMarek Vasut#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) || defined(CONFIG_CPU_PXA25X) 9020f7b1b7SMarek Vasutcpu_init_crit: 9120f7b1b7SMarek Vasut /* 9220f7b1b7SMarek Vasut * flush v4 I/D caches 9320f7b1b7SMarek Vasut */ 9420f7b1b7SMarek Vasut mov r0, #0 9520f7b1b7SMarek Vasut mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */ 9620f7b1b7SMarek Vasut mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */ 972cad92fdSMarek Vasut 9820f7b1b7SMarek Vasut /* 9920f7b1b7SMarek Vasut * disable MMU stuff and caches 10020f7b1b7SMarek Vasut */ 10120f7b1b7SMarek Vasut mrc p15, 0, r0, c1, c0, 0 102097d86d0SMike Dunn bic r0, r0, #0x00003300 @ clear bits 13:12, 9:8 (--VI --RS) 10320f7b1b7SMarek Vasut bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM) 10420f7b1b7SMarek Vasut orr r0, r0, #0x00000002 @ set bit 2 (A) Align 10520f7b1b7SMarek Vasut mcr p15, 0, r0, c1, c0, 0 10684ad6884SPeter Tyser 10720f7b1b7SMarek Vasut mov pc, lr /* back to my caller */ 108abc20abaSMarek Vasut#endif /* !CONFIG_SKIP_LOWLEVEL_INIT || CONFIG_CPU_PXA25X */ 10984ad6884SPeter Tyser 1107f4cfcf4SMarek Vasut/* 1117f4cfcf4SMarek Vasut * Enable MMU to use DCache as DRAM. 1127f4cfcf4SMarek Vasut * 1137f4cfcf4SMarek Vasut * This is useful on PXA25x and PXA26x in early bootstages, where there is no 1147f4cfcf4SMarek Vasut * other possible memory available to hold stack. 1157f4cfcf4SMarek Vasut */ 116abc20abaSMarek Vasut#ifdef CONFIG_CPU_PXA25X 1177f4cfcf4SMarek Vasut.macro CPWAIT reg 1187f4cfcf4SMarek Vasut mrc p15, 0, \reg, c2, c0, 0 1197f4cfcf4SMarek Vasut mov \reg, \reg 1207f4cfcf4SMarek Vasut sub pc, pc, #4 1217f4cfcf4SMarek Vasut.endm 1227f4cfcf4SMarek Vasutlock_cache_for_stack: 1237f4cfcf4SMarek Vasut /* Domain access -- enable for all CPs */ 1247f4cfcf4SMarek Vasut ldr r0, =0x0000ffff 1257f4cfcf4SMarek Vasut mcr p15, 0, r0, c3, c0, 0 1267f4cfcf4SMarek Vasut 1277f4cfcf4SMarek Vasut /* Point TTBR to MMU table */ 1287f4cfcf4SMarek Vasut ldr r0, =mmutable 1297f4cfcf4SMarek Vasut mcr p15, 0, r0, c2, c0, 0 1307f4cfcf4SMarek Vasut 1317f4cfcf4SMarek Vasut /* Kick in MMU, ICache, DCache, BTB */ 1327f4cfcf4SMarek Vasut mrc p15, 0, r0, c1, c0, 0 1337f4cfcf4SMarek Vasut bic r0, #0x1b00 1347f4cfcf4SMarek Vasut bic r0, #0x0087 1357f4cfcf4SMarek Vasut orr r0, #0x1800 1367f4cfcf4SMarek Vasut orr r0, #0x0005 1377f4cfcf4SMarek Vasut mcr p15, 0, r0, c1, c0, 0 1387f4cfcf4SMarek Vasut CPWAIT r0 1397f4cfcf4SMarek Vasut 1407f4cfcf4SMarek Vasut /* Unlock Icache, Dcache */ 1417f4cfcf4SMarek Vasut mcr p15, 0, r0, c9, c1, 1 1427f4cfcf4SMarek Vasut mcr p15, 0, r0, c9, c2, 1 1437f4cfcf4SMarek Vasut 1447f4cfcf4SMarek Vasut /* Flush Icache, Dcache, BTB */ 1457f4cfcf4SMarek Vasut mcr p15, 0, r0, c7, c7, 0 1467f4cfcf4SMarek Vasut 1477f4cfcf4SMarek Vasut /* Unlock I-TLB, D-TLB */ 1487f4cfcf4SMarek Vasut mcr p15, 0, r0, c10, c4, 1 1497f4cfcf4SMarek Vasut mcr p15, 0, r0, c10, c8, 1 1507f4cfcf4SMarek Vasut 1517f4cfcf4SMarek Vasut /* Flush TLB */ 1527f4cfcf4SMarek Vasut mcr p15, 0, r0, c8, c7, 0 1537f4cfcf4SMarek Vasut 1547f4cfcf4SMarek Vasut /* Allocate 4096 bytes of Dcache as RAM */ 1557f4cfcf4SMarek Vasut 1567f4cfcf4SMarek Vasut /* Drain pending loads and stores */ 1577f4cfcf4SMarek Vasut mcr p15, 0, r0, c7, c10, 4 1587f4cfcf4SMarek Vasut 1597f4cfcf4SMarek Vasut mov r4, #0x00 1607f4cfcf4SMarek Vasut mov r5, #0x00 1617f4cfcf4SMarek Vasut mov r2, #0x01 1627f4cfcf4SMarek Vasut mcr p15, 0, r0, c9, c2, 0 1637f4cfcf4SMarek Vasut CPWAIT r0 1647f4cfcf4SMarek Vasut 1657f4cfcf4SMarek Vasut /* 128 lines reserved (128 x 32bytes = 4096 bytes total) */ 1667f4cfcf4SMarek Vasut mov r0, #128 1677f4cfcf4SMarek Vasut ldr r1, =0xfffff000 1687f4cfcf4SMarek Vasut 1697f4cfcf4SMarek Vasutalloc: 1707f4cfcf4SMarek Vasut mcr p15, 0, r1, c7, c2, 5 1717f4cfcf4SMarek Vasut /* Drain pending loads and stores */ 1727f4cfcf4SMarek Vasut mcr p15, 0, r0, c7, c10, 4 1737f4cfcf4SMarek Vasut strd r4, [r1], #8 1747f4cfcf4SMarek Vasut strd r4, [r1], #8 1757f4cfcf4SMarek Vasut strd r4, [r1], #8 1767f4cfcf4SMarek Vasut strd r4, [r1], #8 1777f4cfcf4SMarek Vasut subs r0, #0x01 1787f4cfcf4SMarek Vasut bne alloc 1797f4cfcf4SMarek Vasut /* Drain pending loads and stores */ 1807f4cfcf4SMarek Vasut mcr p15, 0, r0, c7, c10, 4 1817f4cfcf4SMarek Vasut mov r2, #0x00 1827f4cfcf4SMarek Vasut mcr p15, 0, r2, c9, c2, 0 1837f4cfcf4SMarek Vasut CPWAIT r0 1847f4cfcf4SMarek Vasut 1857f4cfcf4SMarek Vasut mov pc, lr 1867f4cfcf4SMarek Vasut 1877f4cfcf4SMarek Vasut.section .mmutable, "a" 1887f4cfcf4SMarek Vasutmmutable: 1897f4cfcf4SMarek Vasut .align 14 1907f4cfcf4SMarek Vasut /* 0x00000000 - 0xffe00000 : 1:1, uncached mapping */ 1917f4cfcf4SMarek Vasut .set __base, 0 1927f4cfcf4SMarek Vasut .rept 0xfff 1937f4cfcf4SMarek Vasut .word (__base << 20) | 0xc12 1947f4cfcf4SMarek Vasut .set __base, __base + 1 1957f4cfcf4SMarek Vasut .endr 1967f4cfcf4SMarek Vasut 1977f4cfcf4SMarek Vasut /* 0xfff00000 : 1:1, cached mapping */ 1987f4cfcf4SMarek Vasut .word (0xfff << 20) | 0x1c1e 199abc20abaSMarek Vasut#endif /* CONFIG_CPU_PXA25X */ 200