1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2011 Freescale Semiconductor, Inc.
4 */
5
6 #include <common.h>
7 #include <log.h>
8 #include <asm/fsl_law.h>
9 #include <asm/mmu.h>
10 #include <linux/log2.h>
11
set_ddr_laws(u64 start,u64 sz,enum law_trgt_if id)12 int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
13 {
14 immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
15 law83xx_t *ecm = &immap->sysconf.ddrlaw[0];
16 u64 start_align, law_sz;
17 int law_sz_enc;
18
19 if (start == 0)
20 start_align = 1ull << (LAW_SIZE_2G + 1);
21 else
22 start_align = 1ull << (__ffs64(start));
23 law_sz = min(start_align, sz);
24 law_sz_enc = __ilog2_u64(law_sz) - 1;
25
26 /*
27 * Set up LAWBAR for all of DDR.
28 */
29 ecm->bar = start & 0xfffff000;
30 ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
31 debug("DDR:bar=0x%08x\n", ecm->bar);
32 debug("DDR:ar=0x%08x\n", ecm->ar);
33
34 /* recalculate size based on what was actually covered by the law */
35 law_sz = 1ull << __ilog2_u64(law_sz);
36
37 /* do we still have anything to map */
38 sz = sz - law_sz;
39 if (sz) {
40 start += law_sz;
41
42 start_align = 1ull << (__ffs64(start));
43 law_sz = min(start_align, sz);
44 law_sz_enc = __ilog2_u64(law_sz) - 1;
45 ecm = &immap->sysconf.ddrlaw[1];
46 ecm->bar = start & 0xfffff000;
47 ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
48 debug("DDR:bar=0x%08x\n", ecm->bar);
49 debug("DDR:ar=0x%08x\n", ecm->ar);
50 } else {
51 return 0;
52 }
53
54 /* do we still have anything to map */
55 sz = sz - law_sz;
56 if (sz)
57 return 1;
58
59 return 0;
60 }
61