LXR linux/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 */
  31static 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 */
  40static 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
  48static 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
  56static 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
  64static 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. */
  75static 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
  83static 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
  91static 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
  99static 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) */
 108