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) */