1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * viking.h: Defines specific to the GNU/Viking MBUS module. 4 * This is SRMMU stuff. 5 * 6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 7 */ 8 #ifndef _SPARC_VIKING_H 9 #define _SPARC_VIKING_H 10 11 #include <asm/asi.h> 12 #include <asm/mxcc.h> 13 #include <asm/pgtable.h> 14 #include <asm/pgtsrmmu.h> 15 16 /* Bits in the SRMMU control register for GNU/Viking modules. 17 * 18 * ----------------------------------------------------------- 19 * |impl-vers| RSV |TC|AC|SP|BM|PC|MBM|SB|IC|DC|PSO|RSV|NF|ME| 20 * ----------------------------------------------------------- 21 * 31 24 23-17 16 15 14 13 12 11 10 9 8 7 6-2 1 0 22 * 23 * TC: Tablewalk Cacheable -- 0 = Twalks are not cacheable in E-cache 24 * 1 = Twalks are cacheable in E-cache 25 * 26 * GNU/Viking will only cache tablewalks in the E-cache (mxcc) if present 27 * and never caches them internally (or so states the docs). Therefore 28 * for machines lacking an E-cache (ie. in MBUS mode) this bit must 29 * remain cleared. 30 * 31 * AC: Alternate Cacheable -- 0 = Passthru physical accesses not cacheable 32 * 1 = Passthru physical accesses cacheable 33 * 34 * This indicates whether accesses are cacheable when no cachable bit 35 * is present in the pte when the processor is in boot-mode or the 36 * access does not need pte's for translation (ie. pass-thru ASI's). 37 * "Cachable" is only referring to E-cache (if present) and not the 38 * on chip split I/D caches of the GNU/Viking. 39 * 40 * SP: SnooP Enable -- 0 = bus snooping off, 1 = bus snooping on 41 * 42 * This enables snooping on the GNU/Viking bus. This must be on 43 * for the hardware cache consistency mechanisms of the GNU/Viking 44 * to work at all. On non-mxcc GNU/Viking modules the split I/D 45 * caches will snoop regardless of whether they are enabled, this 46 * takes care of the case where the I or D or both caches are turned 47 * off yet still contain valid data. Note also that this bit does 48 * not affect GNU/Viking store-buffer snoops, those happen if the 49 * store-buffer is enabled no matter what. 50 * 51 * BM: Boot Mode -- 0 = not in boot mode, 1 = in boot mode 52 * 53 * This indicates whether the GNU/Viking is in boot-mode or not, 54 * if it is then all instruction fetch physical addresses are 55 * computed as 0xff0000000 + low 28 bits of requested address. 56 * GNU/Viking boot-mode does not affect data accesses. Also, 57 * in boot mode instruction accesses bypass the split on chip I/D 58 * caches, they may be cached by the GNU/MXCC if present and enabled. 59 * 60 * MBM: MBus Mode -- 0 = not in MBus mode, 1 = in MBus mode 61 * 62 * This indicated the GNU/Viking configuration present. If in 63 * MBUS mode, the GNU/Viking lacks a GNU/MXCC E-cache. If it is 64 * not then the GNU/Viking is on a module VBUS connected directly 65 * to a GNU/MXCC cache controller. The GNU/MXCC can be thus connected 66 * to either an GNU/MBUS (sun4m) or the packet-switched GNU/XBus (sun4d). 67 * 68 * SB: StoreBuffer enable -- 0 = store buffer off, 1 = store buffer on 69 * 70 * The GNU/Viking store buffer allows the chip to continue execution 71 * after a store even if the data cannot be placed in one of the 72 * caches during that cycle. If disabled, all stores operations 73 * occur synchronously. 74 * 75 * IC: Instruction Cache -- 0 = off, 1 = on 76 * DC: Data Cache -- 0 = off, 1 = 0n 77 * 78 * These bits enable the on-cpu GNU/Viking split I/D caches. Note, 79 * as mentioned above, these caches will snoop the bus in GNU/MBUS 80 * configurations even when disabled to avoid data corruption. 81 * 82 * NF: No Fault -- 0 = faults generate traps, 1 = faults don't trap 83 * ME: MMU enable -- 0 = mmu not translating, 1 = mmu translating 84 * 85 */ 86 87 #define VIKING_MMUENABLE 0x00000001 88 #define VIKING_NOFAULT 0x00000002 89 #define VIKING_PSO 0x00000080 90 #define VIKING_DCENABLE 0x00000100 /* Enable data cache */ 91 #define VIKING_ICENABLE 0x00000200 /* Enable instruction cache */ 92 #define VIKING_SBENABLE 0x00000400 /* Enable store buffer */ 93 #define VIKING_MMODE 0x00000800 /* MBUS mode */ 94 #define VIKING_PCENABLE 0x00001000 /* Enable parity checking */ 95 #define VIKING_BMODE 0x00002000 96 #define VIKING_SPENABLE 0x00004000 /* Enable bus cache snooping */ 97 #define VIKING_ACENABLE 0x00008000 /* Enable alternate caching */ 98 #define VIKING_TCENABLE 0x00010000 /* Enable table-walks to be cached */ 99 #define VIKING_DPENABLE 0x00040000 /* Enable the data prefetcher */ 100 101 /* 102 * GNU/Viking Breakpoint Action Register fields. 103 */ 104 #define VIKING_ACTION_MIX 0x00001000 /* Enable multiple instructions */ 105 106 /* 107 * GNU/Viking Cache Tags. 108 */ 109 #define VIKING_PTAG_VALID 0x01000000 /* Cache block is valid */ 110 #define VIKING_PTAG_DIRTY 0x00010000 /* Block has been modified */ 111 #define VIKING_PTAG_SHARED 0x00000100 /* Shared with some other cache */ 112 113 #ifndef __ASSEMBLY__ 114 115 static inline void viking_flush_icache(void) 116 { 117 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" 118 : /* no outputs */ 119 : "i" (ASI_M_IC_FLCLEAR) 120 : "memory"); 121 } 122 123 static inline void viking_flush_dcache(void) 124 { 125 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" 126 : /* no outputs */ 127 : "i" (ASI_M_DC_FLCLEAR) 128 : "memory"); 129 } 130 131 static inline void viking_unlock_icache(void) 132 { 133 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" 134 : /* no outputs */ 135 : "r" (0x80000000), "i" (ASI_M_IC_FLCLEAR) 136 : "memory"); 137 } 138 139 static inline void viking_unlock_dcache(void) 140 { 141 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" 142 : /* no outputs */ 143 : "r" (0x80000000), "i" (ASI_M_DC_FLCLEAR) 144 : "memory"); 145 } 146 147 static inline void viking_set_bpreg(unsigned long regval) 148 { 149 __asm__ __volatile__("sta %0, [%%g0] %1\n\t" 150 : /* no outputs */ 151 : "r" (regval), "i" (ASI_M_ACTION) 152 : "memory"); 153 } 154 155 static inline unsigned long viking_get_bpreg(void) 156 { 157 unsigned long regval; 158 159 __asm__ __volatile__("lda [%%g0] %1, %0\n\t" 160 : "=r" (regval) 161 : "i" (ASI_M_ACTION)); 162 return regval; 163 } 164 165 static inline void viking_get_dcache_ptag(int set, int block, 166 unsigned long *data) 167 { 168 unsigned long ptag = ((set & 0x7f) << 5) | ((block & 0x3) << 26) | 169 0x80000000; 170 unsigned long info, page; 171 172 __asm__ __volatile__ ("ldda [%2] %3, %%g2\n\t" 173 "or %%g0, %%g2, %0\n\t" 174 "or %%g0, %%g3, %1\n\t" 175 : "=r" (info), "=r" (page) 176 : "r" (ptag), "i" (ASI_M_DATAC_TAG) 177 : "g2", "g3"); 178 data[0] = info; 179 data[1] = page; 180 } 181 182 static inline void viking_mxcc_turn_off_parity(unsigned long *mregp, 183 unsigned long *mxcc_cregp) 184 { 185 unsigned long mreg = *mregp; 186 unsigned long mxcc_creg = *mxcc_cregp; 187 188 mreg &= ~(VIKING_PCENABLE); 189 mxcc_creg &= ~(MXCC_CTL_PARE); 190 191 __asm__ __volatile__ ("set 1f, %%g2\n\t" 192 "andcc %%g2, 4, %%g0\n\t" 193 "bne 2f\n\t" 194 " nop\n" 195 "1:\n\t" 196 "sta %0, [%%g0] %3\n\t" 197 "sta %1, [%2] %4\n\t" 198 "b 1f\n\t" 199 " nop\n\t" 200 "nop\n" 201 "2:\n\t" 202 "sta %0, [%%g0] %3\n\t" 203 "sta %1, [%2] %4\n" 204 "1:\n\t" 205 : /* no output */ 206 : "r" (mreg), "r" (mxcc_creg), 207 "r" (MXCC_CREG), "i" (ASI_M_MMUREGS), 208 "i" (ASI_M_MXCC) 209 : "g2", "memory", "cc"); 210 *mregp = mreg; 211 *mxcc_cregp = mxcc_creg; 212 } 213 214 static inline unsigned long viking_hwprobe(unsigned long vaddr) 215 { 216 unsigned long val; 217 218 vaddr &= PAGE_MASK; 219 /* Probe all MMU entries. */ 220 __asm__ __volatile__("lda [%1] %2, %0\n\t" 221 : "=r" (val) 222 : "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE)); 223 if (!val) 224 return 0; 225 226 /* Probe region. */ 227 __asm__ __volatile__("lda [%1] %2, %0\n\t" 228 : "=r" (val) 229 : "r" (vaddr | 0x200), "i" (ASI_M_FLUSH_PROBE)); 230 if ((val & SRMMU_ET_MASK) == SRMMU_ET_PTE) { 231 vaddr &= ~PGDIR_MASK; 232 vaddr >>= PAGE_SHIFT; 233 return val | (vaddr << 8); 234 } 235 236 /* Probe segment. */ 237 __asm__ __volatile__("lda [%1] %2, %0\n\t" 238 : "=r" (val) 239 : "r" (vaddr | 0x100), "i" (ASI_M_FLUSH_PROBE)); 240 if ((val & SRMMU_ET_MASK) == SRMMU_ET_PTE) { 241 vaddr &= ~PMD_MASK; 242 vaddr >>= PAGE_SHIFT; 243 return val | (vaddr << 8); 244 } 245 246 /* Probe page. */ 247 __asm__ __volatile__("lda [%1] %2, %0\n\t" 248 : "=r" (val) 249 : "r" (vaddr), "i" (ASI_M_FLUSH_PROBE)); 250 return val; 251 } 252 253 #endif /* !__ASSEMBLY__ */ 254 255 #endif /* !(_SPARC_VIKING_H) */ 256