| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /***************************************************************************/ |
| 3 | |
| 4 | /* |
| 5 | * cache.c -- general ColdFire Cache maintenance code |
| 6 | * |
| 7 | * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com) |
| 8 | */ |
| 9 | |
| 10 | /***************************************************************************/ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <asm/coldfire.h> |
| 14 | #include <asm/mcfsim.h> |
| 15 | |
| 16 | /***************************************************************************/ |
| 17 | #ifdef CACHE_PUSH |
| 18 | /***************************************************************************/ |
| 19 | |
| 20 | /* |
| 21 | * Use cpushl to push all dirty cache lines back to memory. |
| 22 | * Older versions of GAS don't seem to know how to generate the |
| 23 | * ColdFire cpushl instruction... Oh well, bit stuff it for now. |
| 24 | */ |
| 25 | |
| 26 | void mcf_cache_push(void) |
| 27 | { |
| 28 | __asm__ __volatile__ ( |
| 29 | "clrl %%d0\n\t" |
| 30 | "1:\n\t" |
| 31 | "movel %%d0,%%a0\n\t" |
| 32 | "2:\n\t" |
| 33 | ".word 0xf468\n\t" |
| 34 | "addl %0,%%a0\n\t" |
| 35 | "cmpl %1,%%a0\n\t" |
| 36 | "blt 2b\n\t" |
| 37 | "addql #1,%%d0\n\t" |
| 38 | "cmpil %2,%%d0\n\t" |
| 39 | "bne 1b\n\t" |
| 40 | : /* No output */ |
| 41 | : "i" (CACHE_LINE_SIZE), |
| 42 | "i" (DCACHE_SIZE / CACHE_WAYS), |
| 43 | "i" (CACHE_WAYS) |
| 44 | : "d0", "a0" ); |
| 45 | } |
| 46 | |
| 47 | /***************************************************************************/ |
| 48 | #endif /* CACHE_PUSH */ |
| 49 | /***************************************************************************/ |