| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /***************************************************************************/ |
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| 3 | |
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| 4 | /* |
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| 5 | * cache.c -- general ColdFire Cache maintenance code |
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| 6 | * |
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| 7 | * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com) |
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| 8 | */ |
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| 9 | |
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| 10 | /***************************************************************************/ |
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| 11 | |
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| 12 | #include <linux/kernel.h> |
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| 13 | #include <asm/coldfire.h> |
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| 14 | #include <asm/mcfsim.h> |
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| 15 | |
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| 16 | /***************************************************************************/ |
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| 17 | #ifdef CACHE_PUSH |
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| 18 | /***************************************************************************/ |
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| 19 | |
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| 20 | /* |
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| 21 | * Use cpushl to push all dirty cache lines back to memory. |
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| 22 | * Older versions of GAS don't seem to know how to generate the |
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| 23 | * ColdFire cpushl instruction... Oh well, bit stuff it for now. |
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| 24 | */ |
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| 25 | |
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| 26 | void mcf_cache_push(void) |
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| 27 | { |
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| 28 | __asm__ __volatile__ ( |
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| 29 | "clrl %%d0\n\t" |
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| 30 | "1:\n\t" |
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| 31 | "movel %%d0,%%a0\n\t" |
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| 32 | "2:\n\t" |
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| 33 | ".word 0xf468\n\t" |
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| 34 | "addl %0,%%a0\n\t" |
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| 35 | "cmpl %1,%%a0\n\t" |
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| 36 | "blt 2b\n\t" |
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| 37 | "addql #1,%%d0\n\t" |
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| 38 | "cmpil %2,%%d0\n\t" |
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| 39 | "bne 1b\n\t" |
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| 40 | : /* No output */ |
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| 41 | : "i" (CACHE_LINE_SIZE), |
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| 42 | "i" (DCACHE_SIZE / CACHE_WAYS), |
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| 43 | "i" (CACHE_WAYS) |
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| 44 | : "d0" , "a0" ); |
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| 45 | } |
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| 46 | |
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| 47 | /***************************************************************************/ |
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| 48 | #endif /* CACHE_PUSH */ |
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| 49 | /***************************************************************************/ |
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| 50 | |
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