| 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved. |
| 7 | * |
| 8 | * This file contains macros used to access MMR registers via |
| 9 | * uncached physical addresses. |
| 10 | * pio_phys_read_mmr - read an MMR |
| 11 | * pio_phys_write_mmr - write an MMR |
| 12 | * pio_atomic_phys_write_mmrs - atomically write 1 or 2 MMRs with psr.ic=0 |
| 13 | * Second MMR will be skipped if address is NULL |
| 14 | * |
| 15 | * Addresses passed to these routines should be uncached physical addresses |
| 16 | * ie., 0x80000.... |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | |
| 21 | #include <asm/asmmacro.h> |
| 22 | #include <asm/page.h> |
| 23 | |
| 24 | GLOBAL_ENTRY(pio_phys_read_mmr) |
| 25 | .prologue |
| 26 | .regstk 1,0,0,0 |
| 27 | .body |
| 28 | mov r2=psr |
| 29 | rsm psr.i | psr.dt |
| 30 | ;; |
| 31 | srlz.d |
| 32 | ld8.acq r8=[r32] |
| 33 | ;; |
| 34 | mov psr.l=r2;; |
| 35 | srlz.d |
| 36 | br.ret.sptk.many rp |
| 37 | END(pio_phys_read_mmr) |
| 38 | |
| 39 | GLOBAL_ENTRY(pio_phys_write_mmr) |
| 40 | .prologue |
| 41 | .regstk 2,0,0,0 |
| 42 | .body |
| 43 | mov r2=psr |
| 44 | rsm psr.i | psr.dt |
| 45 | ;; |
| 46 | srlz.d |
| 47 | st8.rel [r32]=r33 |
| 48 | ;; |
| 49 | mov psr.l=r2;; |
| 50 | srlz.d |
| 51 | br.ret.sptk.many rp |
| 52 | END(pio_phys_write_mmr) |
| 53 | |
| 54 | GLOBAL_ENTRY(pio_atomic_phys_write_mmrs) |
| 55 | .prologue |
| 56 | .regstk 4,0,0,0 |
| 57 | .body |
| 58 | mov r2=psr |
| 59 | cmp.ne p9,p0=r34,r0; |
| 60 | rsm psr.i | psr.dt | psr.ic |
| 61 | ;; |
| 62 | srlz.d |
| 63 | st8.rel [r32]=r33 |
| 64 | (p9) st8.rel [r34]=r35 |
| 65 | ;; |
| 66 | mov psr.l=r2;; |
| 67 | srlz.d |
| 68 | br.ret.sptk.many rp |
| 69 | END(pio_atomic_phys_write_mmrs) |
| 70 | |
| 71 | |