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 /***************************************************************************/