blob: 66c88b697e801f228a9cbe997042a166140030ab [file] [log] [blame]
York Sune12ce982011-08-26 11:32:44 -07001/*
2 * Copyright 2011 Freescale Semiconductor, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * Version 2 as published by the Free Software Foundation.
7 */
8
9#include <common.h>
10#include <asm/fsl_law.h>
11#include <asm/mmu.h>
12
13int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
14{
15 immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
16 law83xx_t *ecm = &immap->sysconf.ddrlaw[0];
17 u64 start_align, law_sz;
18 int law_sz_enc;
19
20 if (start == 0)
21 start_align = 1ull << (LAW_SIZE_2G + 1);
22 else
23 start_align = 1ull << (ffs64(start) - 1);
24 law_sz = min(start_align, sz);
25 law_sz_enc = __ilog2_u64(law_sz) - 1;
26
27 /*
28 * Set up LAWBAR for all of DDR.
29 */
30 ecm->bar = start & 0xfffff000;
31 ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
32 debug("DDR:bar=0x%08x\n", ecm->bar);
33 debug("DDR:ar=0x%08x\n", ecm->ar);
34
35 /* recalculate size based on what was actually covered by the law */
36 law_sz = 1ull << __ilog2_u64(law_sz);
37
38 /* do we still have anything to map */
39 sz = sz - law_sz;
40 if (sz) {
41 start += law_sz;
42
43 start_align = 1ull << (ffs64(start) - 1);
44 law_sz = min(start_align, sz);
45 law_sz_enc = __ilog2_u64(law_sz) - 1;
46 ecm = &immap->sysconf.ddrlaw[1];
47 ecm->bar = start & 0xfffff000;
48 ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
49 debug("DDR:bar=0x%08x\n", ecm->bar);
50 debug("DDR:ar=0x%08x\n", ecm->ar);
51 } else {
52 return 0;
53 }
54
55 /* do we still have anything to map */
56 sz = sz - law_sz;
57 if (sz)
58 return 1;
59
60 return 0;
61}