| Nobuhiro Iwamatsu | 5b6918e | 2008-08-31 22:48:33 +0900 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2007 |
| 3 | * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> |
| 4 | * |
| 5 | * Copyright (C) 2007, 2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> |
| 6 | * Copyright (C) 2008 Renesas Solutions Corp. |
| 7 | * |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <common.h> |
| 28 | #include <command.h> |
| 29 | #include <asm/processor.h> |
| 30 | #include <asm/io.h> |
| 31 | |
| 32 | /* |
| 33 | * Jump to P2 area. |
| 34 | * When handling TLB or caches, we need to do it from P2 area. |
| 35 | */ |
| 36 | #define jump_to_P2() \ |
| 37 | do { \ |
| 38 | unsigned long __dummy; \ |
| 39 | __asm__ __volatile__( \ |
| 40 | "mov.l 1f, %0\n\t" \ |
| 41 | "or %1, %0\n\t" \ |
| 42 | "jmp @%0\n\t" \ |
| 43 | " nop\n\t" \ |
| 44 | ".balign 4\n" \ |
| 45 | "1: .long 2f\n" \ |
| 46 | "2:" \ |
| 47 | : "=&r" (__dummy) \ |
| 48 | : "r" (0x20000000)); \ |
| 49 | } while (0) |
| 50 | |
| 51 | /* |
| 52 | * Back to P1 area. |
| 53 | */ |
| 54 | #define back_to_P1() \ |
| 55 | do { \ |
| 56 | unsigned long __dummy; \ |
| 57 | __asm__ __volatile__( \ |
| 58 | "nop;nop;nop;nop;nop;nop;nop\n\t" \ |
| 59 | "mov.l 1f, %0\n\t" \ |
| 60 | "jmp @%0\n\t" \ |
| 61 | " nop\n\t" \ |
| 62 | ".balign 4\n" \ |
| 63 | "1: .long 2f\n" \ |
| 64 | "2:" \ |
| 65 | : "=&r" (__dummy)); \ |
| 66 | } while (0) |
| 67 | |
| 68 | #define CACHE_VALID 1 |
| 69 | #define CACHE_UPDATED 2 |
| 70 | |
| 71 | static inline void cache_wback_all(void) |
| 72 | { |
| 73 | unsigned long addr, data, i, j; |
| 74 | |
| 75 | jump_to_P2(); |
| 76 | for (i = 0; i < CACHE_OC_NUM_ENTRIES; i++) { |
| 77 | for (j = 0; j < CACHE_OC_NUM_WAYS; j++) { |
| 78 | addr = CACHE_OC_ADDRESS_ARRAY |
| 79 | | (j << CACHE_OC_WAY_SHIFT) |
| 80 | | (i << CACHE_OC_ENTRY_SHIFT); |
| 81 | data = inl(addr); |
| 82 | if (data & CACHE_UPDATED) { |
| 83 | data &= ~CACHE_UPDATED; |
| 84 | outl(data, addr); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | back_to_P1(); |
| 89 | } |
| 90 | |
| 91 | |
| 92 | #define CACHE_ENABLE 0 |
| 93 | #define CACHE_DISABLE 1 |
| 94 | |
| 95 | int cache_control(unsigned int cmd) |
| 96 | { |
| 97 | unsigned long ccr; |
| 98 | |
| 99 | jump_to_P2(); |
| 100 | ccr = inl(CCR); |
| 101 | |
| 102 | if (ccr & CCR_CACHE_ENABLE) |
| 103 | cache_wback_all(); |
| 104 | |
| 105 | if (cmd == CACHE_DISABLE) |
| 106 | outl(CCR_CACHE_STOP, CCR); |
| 107 | else |
| 108 | outl(CCR_CACHE_INIT, CCR); |
| 109 | back_to_P1(); |
| 110 | |
| 111 | return 0; |
| 112 | } |