| York Sun | d29d17d | 2011-08-26 11:32:44 -0700 | [diff] [blame] | 1 | /* |
| 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 | |
| 13 | int 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 | } |