1 /* 2 * arch/xtensa/include/asm/initialize_mmu.h 3 * 4 * Initializes MMU: 5 * 6 * For the new V3 MMU we remap the TLB from virtual == physical 7 * to the standard Linux mapping used in earlier MMU's. 8 * 9 * For the MMU we also support a new configuration register that 10 * specifies how the S32C1I instruction operates with the cache 11 * controller. 12 * 13 * This file is subject to the terms and conditions of the GNU General 14 * Public License. See the file "COPYING" in the main directory of 15 * this archive for more details. 16 * 17 * Copyright (C) 2008 - 2012 Tensilica, Inc. 18 * 19 * Marc Gauthier <marc@tensilica.com> 20 * Pete Delaney <piet@tensilica.com> 21 */ 22 23 #ifndef _XTENSA_INITIALIZE_MMU_H 24 #define _XTENSA_INITIALIZE_MMU_H 25 26 #include <linux/init.h> 27 #include <linux/pgtable.h> 28 #include <asm/vectors.h> 29 30 #if XCHAL_HAVE_PTP_MMU 31 #define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC) 32 #define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC) 33 #else 34 #define CA_WRITEBACK (0x4) 35 #endif 36 37 #ifdef __ASSEMBLY__ 38 39 #define XTENSA_HWVERSION_RC_2009_0 230000 40 41 .macro initialize_mmu 42 43 #if XCHAL_HAVE_S32C1I && (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0) 44 /* 45 * We Have Atomic Operation Control (ATOMCTL) Register; Initialize it. 46 * For details see Documentation/xtensa/atomctl.rst 47 */ 48 #if XCHAL_DCACHE_IS_COHERENT 49 movi a3, 0x25 /* For SMP/MX -- internal for writeback, 50 * RCW otherwise 51 */ 52 #else 53 movi a3, 0x29 /* non-MX -- Most cores use Std Memory 54 * Controlers which usually can't use RCW 55 */ 56 #endif 57 wsr a3, atomctl 58 #endif /* XCHAL_HAVE_S32C1I && 59 * (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0) 60 */ 61 62 #if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY 63 /* 64 * Have MMU v3 65 */ 66 67 #if !XCHAL_HAVE_VECBASE 68 # error "MMU v3 requires reloc vectors" 69 #endif 70 71 movi a1, 0 72 _call0 1f 73 _j 2f 74 75 .align 4 76 1: movi a2, 0x10000000 77 78 #if CONFIG_KERNEL_LOAD_ADDRESS < 0x40000000ul 79 #define TEMP_MAPPING_VADDR 0x40000000 80 #else 81 #define TEMP_MAPPING_VADDR 0x00000000 82 #endif 83 84 /* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */ 85 86 movi a2, TEMP_MAPPING_VADDR | XCHAL_SPANNING_WAY 87 idtlb a2 88 iitlb a2 89 isync 90 91 /* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code 92 * and jump to the new mapping. 93 */ 94 95 srli a3, a0, 27 96 slli a3, a3, 27 97 addi a3, a3, CA_BYPASS 98 addi a7, a2, 5 - XCHAL_SPANNING_WAY 99 wdtlb a3, a7 100 witlb a3, a7 101 isync 102 103 slli a4, a0, 5 104 srli a4, a4, 5 105 addi a5, a2, -XCHAL_SPANNING_WAY 106 add a4, a4, a5 107 jx a4 108 109 /* Step 3: unmap everything other than current area. 110 * Start at 0x60000000, wrap around, and end with 0x20000000 111 */ 112 2: movi a4, 0x20000000 113 add a5, a2, a4 114 3: idtlb a5 115 iitlb a5 116 add a5, a5, a4 117 bne a5, a2, 3b 118 119 /* Step 4: Setup MMU with the requested static mappings. */ 120 121 movi a6, 0x01000000 122 wsr a6, ITLBCFG 123 wsr a6, DTLBCFG 124 isync 125 126 movi a5, XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_TLB_WAY 127 movi a4, XCHAL_KSEG_PADDR + CA_WRITEBACK 128 wdtlb a4, a5 129 witlb a4, a5 130 131 movi a5, XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_TLB_WAY 132 movi a4, XCHAL_KSEG_PADDR + CA_BYPASS 133 wdtlb a4, a5 134 witlb a4, a5 135 136 #ifdef CONFIG_XTENSA_KSEG_512M 137 movi a5, XCHAL_KSEG_CACHED_VADDR + 0x10000000 + XCHAL_KSEG_TLB_WAY 138 movi a4, XCHAL_KSEG_PADDR + 0x10000000 + CA_WRITEBACK 139 wdtlb a4, a5 140 witlb a4, a5 141 142 movi a5, XCHAL_KSEG_BYPASS_VADDR + 0x10000000 + XCHAL_KSEG_TLB_WAY 143 movi a4, XCHAL_KSEG_PADDR + 0x10000000 + CA_BYPASS 144 wdtlb a4, a5 145 witlb a4, a5 146 #endif 147 148 movi a5, XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_TLB_WAY 149 movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_WRITEBACK 150 wdtlb a4, a5 151 witlb a4, a5 152 153 movi a5, XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_TLB_WAY 154 movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_BYPASS 155 wdtlb a4, a5 156 witlb a4, a5 157 158 isync 159 160 /* Jump to self, using final mappings. */ 161 movi a4, 1f 162 jx a4 163 164 1: 165 /* Step 5: remove temporary mapping. */ 166 idtlb a7 167 iitlb a7 168 isync 169 170 movi a0, 0 171 wsr a0, ptevaddr 172 rsync 173 174 #endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && 175 XCHAL_HAVE_SPANNING_WAY */ 176 177 .endm 178 179 .macro initialize_cacheattr 180 181 #if !defined(CONFIG_MMU) && (XCHAL_HAVE_TLBS || XCHAL_HAVE_MPU) 182 #if CONFIG_MEMMAP_CACHEATTR == 0x22222222 && XCHAL_HAVE_PTP_MMU 183 #error Default MEMMAP_CACHEATTR of 0x22222222 does not work with full MMU. 184 #endif 185 186 #if XCHAL_HAVE_MPU 187 __REFCONST 188 .align 4 189 .Lattribute_table: 190 .long 0x000000, 0x1fff00, 0x1ddf00, 0x1eef00 191 .long 0x006600, 0x000000, 0x000000, 0x000000 192 .long 0x000000, 0x000000, 0x000000, 0x000000 193 .long 0x000000, 0x000000, 0x000000, 0x000000 194 .previous 195 196 movi a3, .Lattribute_table 197 movi a4, CONFIG_MEMMAP_CACHEATTR 198 movi a5, 1 199 movi a6, XCHAL_MPU_ENTRIES 200 movi a10, 0x20000000 201 movi a11, -1 202 1: 203 sub a5, a5, a10 204 extui a8, a4, 28, 4 205 beq a8, a11, 2f 206 addi a6, a6, -1 207 mov a11, a8 208 2: 209 addx4 a9, a8, a3 210 l32i a9, a9, 0 211 or a9, a9, a6 212 wptlb a9, a5 213 slli a4, a4, 4 214 bgeu a5, a10, 1b 215 216 #else 217 movi a5, XCHAL_SPANNING_WAY 218 movi a6, ~_PAGE_ATTRIB_MASK 219 movi a4, CONFIG_MEMMAP_CACHEATTR 220 movi a8, 0x20000000 221 1: 222 rdtlb1 a3, a5 223 xor a3, a3, a4 224 and a3, a3, a6 225 xor a3, a3, a4 226 wdtlb a3, a5 227 ritlb1 a3, a5 228 xor a3, a3, a4 229 and a3, a3, a6 230 xor a3, a3, a4 231 witlb a3, a5 232 233 add a5, a5, a8 234 srli a4, a4, 4 235 bgeu a5, a8, 1b 236 237 isync 238 #endif 239 #endif 240 241 .endm 242 243 #endif /*__ASSEMBLY__*/ 244 245 #endif /* _XTENSA_INITIALIZE_MMU_H */ 246