LXR linux/arch/sparc/include/asm/viking.h

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