1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /***************************************************************************/
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun /*
5*4882a593Smuzhiyun * cache.c -- general ColdFire Cache maintenance code
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /***************************************************************************/
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <asm/coldfire.h>
14*4882a593Smuzhiyun #include <asm/mcfsim.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /***************************************************************************/
17*4882a593Smuzhiyun #ifdef CACHE_PUSH
18*4882a593Smuzhiyun /***************************************************************************/
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun /*
21*4882a593Smuzhiyun * Use cpushl to push all dirty cache lines back to memory.
22*4882a593Smuzhiyun * Older versions of GAS don't seem to know how to generate the
23*4882a593Smuzhiyun * ColdFire cpushl instruction... Oh well, bit stuff it for now.
24*4882a593Smuzhiyun */
25*4882a593Smuzhiyun
mcf_cache_push(void)26*4882a593Smuzhiyun void mcf_cache_push(void)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun __asm__ __volatile__ (
29*4882a593Smuzhiyun "clrl %%d0\n\t"
30*4882a593Smuzhiyun "1:\n\t"
31*4882a593Smuzhiyun "movel %%d0,%%a0\n\t"
32*4882a593Smuzhiyun "2:\n\t"
33*4882a593Smuzhiyun ".word 0xf468\n\t"
34*4882a593Smuzhiyun "addl %0,%%a0\n\t"
35*4882a593Smuzhiyun "cmpl %1,%%a0\n\t"
36*4882a593Smuzhiyun "blt 2b\n\t"
37*4882a593Smuzhiyun "addql #1,%%d0\n\t"
38*4882a593Smuzhiyun "cmpil %2,%%d0\n\t"
39*4882a593Smuzhiyun "bne 1b\n\t"
40*4882a593Smuzhiyun : /* No output */
41*4882a593Smuzhiyun : "i" (CACHE_LINE_SIZE),
42*4882a593Smuzhiyun "i" (DCACHE_SIZE / CACHE_WAYS),
43*4882a593Smuzhiyun "i" (CACHE_WAYS)
44*4882a593Smuzhiyun : "d0", "a0" );
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /***************************************************************************/
48*4882a593Smuzhiyun #endif /* CACHE_PUSH */
49*4882a593Smuzhiyun /***************************************************************************/
50