arch/sparc/include/asm/swift.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* swift.h: Specific definitions for the _broken_ Swift SRMMU
   3  *          MMU module.
   4  *
   5  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #ifndef _SPARC_SWIFT_H
   9 #define _SPARC_SWIFT_H
  10
  11 /* Swift is so brain damaged, here is the mmu control register. */
  12 #define SWIFT_ST       0x00800000   /* SW tablewalk enable */
  13 #define SWIFT_WP       0x00400000   /* Watchpoint enable   */
  14
  15 /* Branch folding (buggy, disable on production systems!)  */
  16 #define SWIFT_BF       0x00200000
  17 #define SWIFT_PMC      0x00180000   /* Page mode control   */
  18 #define SWIFT_PE       0x00040000   /* Parity enable       */
  19 #define SWIFT_PC       0x00020000   /* Parity control      */
  20 #define SWIFT_AP       0x00010000   /* Graphics page mode control (TCX/SX) */
  21 #define SWIFT_AC       0x00008000   /* Alternate Cacheability (see viking.h) */
  22 #define SWIFT_BM       0x00004000   /* Boot mode */
  23 #define SWIFT_RC       0x00003c00   /* DRAM refresh control */
  24 #define SWIFT_IE       0x00000200   /* Instruction cache enable */
  25 #define SWIFT_DE       0x00000100   /* Data cache enable */
  26 #define SWIFT_SA       0x00000080   /* Store Allocate */
  27 #define SWIFT_NF       0x00000002   /* No fault mode */
  28 #define SWIFT_EN       0x00000001   /* MMU enable */
  29
  30 /* Bits [13:5] select one of 512 instruction cache tags */
  31 static inline void swift_inv_insn_tag(unsigned long addr)
  32 {
  33         __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
  34                              : /* no outputs */
  35                              : "r" (addr), "i" (ASI_M_TXTC_TAG)
  36                              : "memory");
  37 }
  38
  39 /* Bits [12:4] select one of 512 data cache tags */
  40 static inline void swift_inv_data_tag(unsigned long addr)
  41 {
  42         __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
  43                              : /* no outputs */
  44                              : "r" (addr), "i" (ASI_M_DATAC_TAG)
  45                              : "memory");
  46 }
  47
  48 static inline void swift_flush_dcache(void)
  49 {
  50         unsigned long addr;
  51
  52         for (addr = 0; addr < 0x2000; addr += 0x10)
  53                 swift_inv_data_tag(addr);
  54 }
  55
  56 static inline void swift_flush_icache(void)
  57 {
  58         unsigned long addr;
  59
  60         for (addr = 0; addr < 0x4000; addr += 0x20)
  61                 swift_inv_insn_tag(addr);
  62 }
  63
  64 static inline void swift_idflash_clear(void)
  65 {
  66         unsigned long addr;
  67
  68         for (addr = 0; addr < 0x2000; addr += 0x10) {
  69                 swift_inv_insn_tag(addr<<1);
  70                 swift_inv_data_tag(addr);
  71         }
  72 }
  73
  74 /* Swift is so broken, it isn't even safe to use the following. */
  75 static inline void swift_flush_page(unsigned long page)
  76 {
  77         __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
  78                              : /* no outputs */
  79                              : "r" (page), "i" (ASI_M_FLUSH_PAGE)
  80                              : "memory");
  81 }
  82
  83 static inline void swift_flush_segment(unsigned long addr)
  84 {
  85         __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
  86                              : /* no outputs */
  87                              : "r" (addr), "i" (ASI_M_FLUSH_SEG)
  88                              : "memory");
  89 }
  90
  91 static inline void swift_flush_region(unsigned long addr)
  92 {
  93         __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
  94                              : /* no outputs */
  95                              : "r" (addr), "i" (ASI_M_FLUSH_REGION)
  96                              : "memory");
  97 }
  98
  99 static inline void swift_flush_context(void)
 100 {
 101         __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"
 102                              : /* no outputs */
 103                              : "i" (ASI_M_FLUSH_CTX)
 104                              : "memory");
 105 }
 106
 107 #endif /* !(_SPARC_SWIFT_H) */