| wdenk | b50cde5 | 2004-01-24 20:25:54 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2004 |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <mpc8xx.h> |
| 25 | #include <ppc_asm.tmpl> |
| 26 | #include <asm/cache.h> |
| 27 | |
| 28 | #define CACHE_CMD_ENABLE 0x02000000 |
| 29 | #define CACHE_CMD_DISABLE 0x04000000 |
| 30 | #define CACHE_CMD_LOAD_LOCK 0x06000000 |
| 31 | #define CACHE_CMD_UNLOCK_LINE 0x08000000 |
| 32 | #define CACHE_CMD_UNLOCK_ALL 0x0A000000 |
| 33 | #define CACHE_CMD_INVALIDATE 0x0C000000 |
| 34 | #define SPEED_PLPRCR_WAIT_5CYC 150 |
| 35 | #define _CACHE_ALIGN_SIZE 16 |
| 36 | |
| 37 | |
| 38 | .text |
| 39 | .align 2 |
| 40 | .globl plprcr_write_866 |
| 41 | |
| 42 | /* |
| 43 | * void plprcr_write_866 (long plprcr) |
| 44 | * Write PLPRCR, including workaround for device errata SIU4 and SIU9. |
| 45 | */ |
| 46 | |
| 47 | plprcr_write_866: |
| 48 | mfspr r10, LR /* save the Link Register value */ |
| 49 | |
| 50 | /* turn instruction cache on (no MMU required for instructions) |
| 51 | */ |
| 52 | lis r4, CACHE_CMD_ENABLE@h |
| 53 | ori r4, r4, CACHE_CMD_ENABLE@l |
| 54 | mtspr IC_CST, r4 |
| 55 | isync |
| 56 | |
| 57 | /* clear IC_CST error bits |
| 58 | */ |
| 59 | mfspr r4, IC_CST |
| 60 | |
| 61 | bl plprcr_here |
| 62 | |
| 63 | plprcr_here: |
| 64 | mflr r5 |
| 65 | |
| 66 | /* calculate relocation offset |
| 67 | */ |
| 68 | lis r4, plprcr_here@h |
| 69 | ori r4, r4, plprcr_here@l |
| 70 | sub r5, r5, r4 |
| 71 | |
| 72 | /* calculate first address of this function |
| 73 | */ |
| 74 | lis r6, plprcr_write_866@h |
| 75 | ori r6, r6, plprcr_write_866@l |
| 76 | add r6, r6, r5 |
| 77 | |
| 78 | /* calculate end address of this function |
| 79 | */ |
| 80 | lis r7, plprcr_end@h |
| 81 | ori r7, r7, plprcr_end@l |
| 82 | add r7, r7, r5 |
| 83 | |
| 84 | /* load and lock code addresses |
| 85 | */ |
| 86 | mr r5, r6 |
| 87 | |
| 88 | plprcr_loop: |
| 89 | mtspr IC_ADR, r5 |
| 90 | addi r5, r5, _CACHE_ALIGN_SIZE /* increment by one line */ |
| 91 | |
| 92 | lis r4, CACHE_CMD_LOAD_LOCK@h |
| 93 | ori r4, r4, CACHE_CMD_LOAD_LOCK@l |
| 94 | mtspr IC_CST, r4 |
| 95 | isync |
| 96 | |
| 97 | cmpw r5, r7 |
| 98 | blt plprcr_loop |
| 99 | |
| 100 | /* IC_CST error bits not evaluated |
| 101 | */ |
| 102 | |
| 103 | /* switch PLPRCR |
| 104 | */ |
| 105 | mfspr r4, IMMR /* read IMMR */ |
| 106 | rlwinm r4, r4, 0, 0, 15 /* only high 16 bits count */ |
| 107 | |
| 108 | /* write sequence according to MPC866 Errata |
| 109 | */ |
| 110 | stw r3, PLPRCR(r4) |
| 111 | isync |
| 112 | |
| 113 | lis r3, SPEED_PLPRCR_WAIT_5CYC@h |
| 114 | ori r3, r3, SPEED_PLPRCR_WAIT_5CYC@l |
| 115 | |
| 116 | plprcr_wait: |
| 117 | cmpwi r3, 0 |
| 118 | beq plprcr_wait_end |
| 119 | nop |
| 120 | subi r3, r3, 1 |
| 121 | b plprcr_wait |
| 122 | |
| 123 | plprcr_wait_end: |
| 124 | |
| wdenk | 4b6e905 | 2004-02-06 21:48:22 +0000 | [diff] [blame] | 125 | /* unlock instruction cache but leave it enabled |
| wdenk | b50cde5 | 2004-01-24 20:25:54 +0000 | [diff] [blame] | 126 | */ |
| 127 | lis r4, CACHE_CMD_UNLOCK_ALL@h |
| 128 | ori r4, r4, CACHE_CMD_UNLOCK_ALL@l |
| 129 | mtspr IC_CST, r4 |
| 130 | isync |
| 131 | |
| wdenk | b50cde5 | 2004-01-24 20:25:54 +0000 | [diff] [blame] | 132 | mtspr LR, r10 /* restore original Link Register value */ |
| 133 | blr |
| 134 | |
| 135 | plprcr_end: |