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