1/* 2 * armboot - Startup Code for OMAP3530/ARM Cortex CPU-core 3 * 4 * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com> 5 * 6 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> 7 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> 8 * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> 9 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> 10 * Copyright (c) 2003 Kshitij <kshitij@ti.com> 11 * Copyright (c) 2006-2008 Syed Mohammed Khasim <x0khasim@ti.com> 12 * 13 * SPDX-License-Identifier: GPL-2.0+ 14 */ 15 16#include <asm-offsets.h> 17#include <config.h> 18#include <asm/system.h> 19#include <linux/linkage.h> 20#include <asm/armv7.h> 21 22/************************************************************************* 23 * 24 * Startup Code (reset vector) 25 * 26 * Do important init only if we don't start from memory! 27 * Setup memory and board specific bits prior to relocation. 28 * Relocate armboot to ram. Setup stack. 29 * 30 *************************************************************************/ 31 32 .globl reset 33 .globl save_boot_params_ret 34 .type save_boot_params_ret,%function 35#ifdef CONFIG_ARMV7_LPAE 36 .global switch_to_hypervisor_ret 37#endif 38 39reset: 40 /* Allow the board to save important registers */ 41 b save_boot_params 42save_boot_params_ret: 43#ifdef CONFIG_ARMV7_LPAE 44/* 45 * check for Hypervisor support 46 */ 47 mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1 48 and r0, r0, #CPUID_ARM_VIRT_MASK @ mask virtualization bits 49 cmp r0, #(1 << CPUID_ARM_VIRT_SHIFT) 50 beq switch_to_hypervisor 51switch_to_hypervisor_ret: 52#endif 53 /* 54 * disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode, 55 * except if in HYP mode already 56 */ 57 mrs r0, cpsr 58 and r1, r0, #0x1f @ mask mode bits 59 teq r1, #0x1a @ test for HYP mode 60 bicne r0, r0, #0x1f @ clear all mode bits 61 orrne r0, r0, #0x13 @ set SVC mode 62 orr r0, r0, #0xc0 @ disable FIQ and IRQ 63 msr cpsr,r0 64 65/* 66 * Setup vector: 67 * (OMAP4 spl TEXT_BASE is not 32 byte aligned. 68 * Continue to use ROM code vector only in OMAP4 spl) 69 */ 70#if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD)) 71 /* Set V=0 in CP15 SCTLR register - for VBAR to point to vector */ 72 mrc p15, 0, r0, c1, c0, 0 @ Read CP15 SCTLR Register 73 bic r0, #CR_V @ V = 0 74 mcr p15, 0, r0, c1, c0, 0 @ Write CP15 SCTLR Register 75 76 /* Set vector address in CP15 VBAR register */ 77 ldr r0, =_start 78 mcr p15, 0, r0, c12, c0, 0 @Set VBAR 79#endif 80 81 /* the mask ROM code should have PLL and others stable */ 82#ifndef CONFIG_SKIP_LOWLEVEL_INIT 83 bl cpu_init_cp15 84#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY 85 bl cpu_init_crit 86#endif 87#endif 88 89 bl _main 90 91/*------------------------------------------------------------------------------*/ 92 93ENTRY(c_runtime_cpu_setup) 94/* 95 * If I-cache is enabled invalidate it 96 */ 97#ifndef CONFIG_SYS_ICACHE_OFF 98 mcr p15, 0, r0, c7, c5, 0 @ invalidate icache 99 mcr p15, 0, r0, c7, c10, 4 @ DSB 100 mcr p15, 0, r0, c7, c5, 4 @ ISB 101#endif 102 103 bx lr 104 105ENDPROC(c_runtime_cpu_setup) 106 107/************************************************************************* 108 * 109 * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) 110 * __attribute__((weak)); 111 * 112 * Stack pointer is not yet initialized at this moment 113 * Don't save anything to stack even if compiled with -O0 114 * 115 *************************************************************************/ 116ENTRY(save_boot_params) 117 b save_boot_params_ret @ back to my caller 118ENDPROC(save_boot_params) 119 .weak save_boot_params 120 121#ifdef CONFIG_ARMV7_LPAE 122ENTRY(switch_to_hypervisor) 123 b switch_to_hypervisor_ret 124ENDPROC(switch_to_hypervisor) 125 .weak switch_to_hypervisor 126#endif 127 128/************************************************************************* 129 * 130 * cpu_init_cp15 131 * 132 * Setup CP15 registers (cache, MMU, TLBs). The I-cache is turned on unless 133 * CONFIG_SYS_ICACHE_OFF is defined. 134 * 135 *************************************************************************/ 136ENTRY(cpu_init_cp15) 137 /* 138 * Invalidate L1 I/D 139 */ 140 mov r0, #0 @ set up for MCR 141 mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs 142 mcr p15, 0, r0, c7, c5, 0 @ invalidate icache 143 mcr p15, 0, r0, c7, c5, 6 @ invalidate BP array 144 mcr p15, 0, r0, c7, c10, 4 @ DSB 145 mcr p15, 0, r0, c7, c5, 4 @ ISB 146 147 /* 148 * disable MMU stuff and caches 149 */ 150 mrc p15, 0, r0, c1, c0, 0 151 bic r0, r0, #0x00002000 @ clear bits 13 (--V-) 152 bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM) 153 orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align 154 orr r0, r0, #0x00000800 @ set bit 11 (Z---) BTB 155#ifdef CONFIG_SYS_ICACHE_OFF 156 bic r0, r0, #0x00001000 @ clear bit 12 (I) I-cache 157#else 158 orr r0, r0, #0x00001000 @ set bit 12 (I) I-cache 159#endif 160 mcr p15, 0, r0, c1, c0, 0 161 162#ifdef CONFIG_ARM_ERRATA_716044 163 mrc p15, 0, r0, c1, c0, 0 @ read system control register 164 orr r0, r0, #1 << 11 @ set bit #11 165 mcr p15, 0, r0, c1, c0, 0 @ write system control register 166#endif 167 168#if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072)) 169 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 170 orr r0, r0, #1 << 4 @ set bit #4 171 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 172#endif 173 174#ifdef CONFIG_ARM_ERRATA_743622 175 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 176 orr r0, r0, #1 << 6 @ set bit #6 177 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 178#endif 179 180#ifdef CONFIG_ARM_ERRATA_751472 181 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 182 orr r0, r0, #1 << 11 @ set bit #11 183 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 184#endif 185#ifdef CONFIG_ARM_ERRATA_761320 186 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 187 orr r0, r0, #1 << 21 @ set bit #21 188 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 189#endif 190 191#ifdef CONFIG_ARM_ERRATA_845369 192 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 193 orr r0, r0, #1 << 22 @ set bit #22 194 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 195#endif 196 197 mov r5, lr @ Store my Caller 198 mrc p15, 0, r1, c0, c0, 0 @ r1 has Read Main ID Register (MIDR) 199 mov r3, r1, lsr #20 @ get variant field 200 and r3, r3, #0xf @ r3 has CPU variant 201 and r4, r1, #0xf @ r4 has CPU revision 202 mov r2, r3, lsl #4 @ shift variant field for combined value 203 orr r2, r4, r2 @ r2 has combined CPU variant + revision 204 205#ifdef CONFIG_ARM_ERRATA_798870 206 cmp r2, #0x30 @ Applies to lower than R3p0 207 bge skip_errata_798870 @ skip if not affected rev 208 cmp r2, #0x20 @ Applies to including and above R2p0 209 blt skip_errata_798870 @ skip if not affected rev 210 211 mrc p15, 1, r0, c15, c0, 0 @ read l2 aux ctrl reg 212 orr r0, r0, #1 << 7 @ Enable hazard-detect timeout 213 push {r1-r5} @ Save the cpu info registers 214 bl v7_arch_cp15_set_l2aux_ctrl 215 isb @ Recommended ISB after l2actlr update 216 pop {r1-r5} @ Restore the cpu info - fall through 217skip_errata_798870: 218#endif 219 220#ifdef CONFIG_ARM_ERRATA_801819 221 cmp r2, #0x24 @ Applies to lt including R2p4 222 bgt skip_errata_801819 @ skip if not affected rev 223 cmp r2, #0x20 @ Applies to including and above R2p0 224 blt skip_errata_801819 @ skip if not affected rev 225 mrc p15, 0, r0, c0, c0, 6 @ pick up REVIDR reg 226 and r0, r0, #1 << 3 @ check REVIDR[3] 227 cmp r0, #1 << 3 228 beq skip_errata_801819 @ skip erratum if REVIDR[3] is set 229 230 mrc p15, 0, r0, c1, c0, 1 @ read auxilary control register 231 orr r0, r0, #3 << 27 @ Disables streaming. All write-allocate 232 @ lines allocate in the L1 or L2 cache. 233 orr r0, r0, #3 << 25 @ Disables streaming. All write-allocate 234 @ lines allocate in the L1 cache. 235 push {r1-r5} @ Save the cpu info registers 236 bl v7_arch_cp15_set_acr 237 pop {r1-r5} @ Restore the cpu info - fall through 238skip_errata_801819: 239#endif 240 241#ifdef CONFIG_ARM_ERRATA_454179 242 mrc p15, 0, r0, c1, c0, 1 @ Read ACR 243 244 cmp r2, #0x21 @ Only on < r2p1 245 orrlt r0, r0, #(0x3 << 6) @ Set DBSM(BIT7) and IBE(BIT6) bits 246 247 push {r1-r5} @ Save the cpu info registers 248 bl v7_arch_cp15_set_acr 249 pop {r1-r5} @ Restore the cpu info - fall through 250#endif 251 252#ifdef CONFIG_ARM_ERRATA_430973 253 mrc p15, 0, r0, c1, c0, 1 @ Read ACR 254 255 cmp r2, #0x21 @ Only on < r2p1 256 orrlt r0, r0, #(0x1 << 6) @ Set IBE bit 257 258 push {r1-r5} @ Save the cpu info registers 259 bl v7_arch_cp15_set_acr 260 pop {r1-r5} @ Restore the cpu info - fall through 261#endif 262 263#ifdef CONFIG_ARM_ERRATA_621766 264 mrc p15, 0, r0, c1, c0, 1 @ Read ACR 265 266 cmp r2, #0x21 @ Only on < r2p1 267 orrlt r0, r0, #(0x1 << 5) @ Set L1NEON bit 268 269 push {r1-r5} @ Save the cpu info registers 270 bl v7_arch_cp15_set_acr 271 pop {r1-r5} @ Restore the cpu info - fall through 272#endif 273 274#ifdef CONFIG_ARM_ERRATA_725233 275 mrc p15, 1, r0, c9, c0, 2 @ Read L2ACR 276 277 cmp r2, #0x21 @ Only on < r2p1 (Cortex A8) 278 orrlt r0, r0, #(0x1 << 27) @ L2 PLD data forwarding disable 279 280 push {r1-r5} @ Save the cpu info registers 281 bl v7_arch_cp15_set_l2aux_ctrl 282 pop {r1-r5} @ Restore the cpu info - fall through 283#endif 284 285#ifdef CONFIG_ARM_ERRATA_852421 286 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 287 orr r0, r0, #1 << 24 @ set bit #24 288 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 289#endif 290 291#ifdef CONFIG_ARM_ERRATA_852423 292 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register 293 orr r0, r0, #1 << 12 @ set bit #12 294 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register 295#endif 296 297 mov pc, r5 @ back to my caller 298ENDPROC(cpu_init_cp15) 299 300#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ 301 !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) 302/************************************************************************* 303 * 304 * CPU_init_critical registers 305 * 306 * setup important registers 307 * setup memory timing 308 * 309 *************************************************************************/ 310ENTRY(cpu_init_crit) 311 /* 312 * Jump to board specific initialization... 313 * The Mask ROM will have already initialized 314 * basic memory. Go here to bump up clock rate and handle 315 * wake up conditions. 316 */ 317 b lowlevel_init @ go setup pll,mux,memory 318ENDPROC(cpu_init_crit) 319#endif 320