| Paul Burton | 96c6847 | 2018-12-16 19:25:22 -0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Startup Code for MIPS32 XBURST CPU-core |
| 4 | * |
| 5 | * Copyright (c) 2010 Xiangfu Liu <xiangfu@sharism.cc> |
| 6 | */ |
| 7 | |
| 8 | #include <config.h> |
| 9 | #include <asm/regdef.h> |
| 10 | #include <asm/mipsregs.h> |
| 11 | #include <asm/addrspace.h> |
| 12 | #include <asm/cacheops.h> |
| 13 | #include <asm/cache.h> |
| 14 | #include <mach/jz4780.h> |
| 15 | |
| 16 | .set noreorder |
| 17 | |
| 18 | .globl _start |
| 19 | .text |
| 20 | _start: |
| 21 | #ifdef CONFIG_SPL_BUILD |
| 22 | |
| 23 | /* magic value ("MSPL") */ |
| 24 | .word 0x4d53504c |
| 25 | |
| 26 | /* Invalidate BTB */ |
| 27 | mfc0 t0, CP0_CONFIG, 7 |
| 28 | nop |
| 29 | ori t0, 2 |
| 30 | mtc0 t0, CP0_CONFIG, 7 |
| 31 | nop |
| 32 | |
| 33 | /* |
| 34 | * CU0=UM=EXL=IE=0, BEV=ERL=1, IP2~7=1 |
| 35 | */ |
| 36 | li t0, 0x0040FC04 |
| 37 | mtc0 t0, CP0_STATUS |
| 38 | |
| 39 | /* CAUSE register */ |
| 40 | /* IV=1, use the specical interrupt vector (0x200) */ |
| 41 | li t1, 0x00800000 |
| 42 | mtc0 t1, CP0_CAUSE |
| 43 | |
| 44 | #ifdef CONFIG_SOC_JZ4780 |
| 45 | /* enable bridge radical mode */ |
| 46 | la t0, CPM_BASE |
| 47 | lw t1, 0x24(t0) |
| 48 | ori t1, t1, 0x22 |
| 49 | sw t1, 0x24(t0) |
| 50 | #endif |
| 51 | |
| 52 | /* Set up stack */ |
| 53 | li sp, CONFIG_SPL_STACK |
| 54 | |
| 55 | b board_init_f |
| 56 | nop |
| 57 | |
| 58 | #ifdef CONFIG_SOC_JZ4780 |
| 59 | |
| 60 | .globl enable_caches |
| 61 | .ent enable_caches |
| 62 | enable_caches: |
| 63 | mtc0 zero, CP0_TAGLO |
| 64 | mtc0 zero, CP0_TAGHI |
| 65 | |
| 66 | li t0, KSEG0 |
| 67 | addu t1, t0, CONFIG_SYS_DCACHE_SIZE |
| 68 | 1: |
| 69 | cache INDEX_STORE_TAG_D, 0(t0) |
| 70 | bne t0, t1, 1b |
| 71 | addiu t0, t0, CONFIG_SYS_CACHELINE_SIZE |
| 72 | |
| 73 | li t0, KSEG0 |
| 74 | addu t1, t0, CONFIG_SYS_ICACHE_SIZE |
| 75 | 2: |
| 76 | cache INDEX_STORE_TAG_I, 0(t0) |
| 77 | bne t0, t1, 2b |
| 78 | addiu t0, t0, CONFIG_SYS_CACHELINE_SIZE |
| 79 | |
| 80 | /* Invalidate BTB */ |
| 81 | mfc0 t0, CP0_CONFIG, 7 |
| 82 | nop |
| 83 | ori t0, 2 |
| 84 | mtc0 t0, CP0_CONFIG, 7 |
| 85 | nop |
| 86 | |
| 87 | /* Enable caches */ |
| 88 | li t0, CONF_CM_CACHABLE_NONCOHERENT |
| 89 | mtc0 t0, CP0_CONFIG |
| 90 | nop |
| 91 | |
| 92 | jr ra |
| 93 | nop |
| 94 | |
| 95 | .end enable_caches |
| 96 | |
| 97 | #endif /* CONFIG_SOC_JZ4780 */ |
| 98 | #endif /* !CONFIG_SPL_BUILD */ |