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 #include <linux/log2.h> 13 14 int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id) 15 { 16 immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; 17 law83xx_t *ecm = &immap->sysconf.ddrlaw[0]; 18 u64 start_align, law_sz; 19 int law_sz_enc; 20 21 if (start == 0) 22 start_align = 1ull << (LAW_SIZE_2G + 1); 23 else 24 start_align = 1ull << (__ffs64(start) - 1); 25 law_sz = min(start_align, sz); 26 law_sz_enc = __ilog2_u64(law_sz) - 1; 27 28 /* 29 * Set up LAWBAR for all of DDR. 30 */ 31 ecm->bar = start & 0xfffff000; 32 ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc)); 33 debug("DDR:bar=0x%08x\n", ecm->bar); 34 debug("DDR:ar=0x%08x\n", ecm->ar); 35 36 /* recalculate size based on what was actually covered by the law */ 37 law_sz = 1ull << __ilog2_u64(law_sz); 38 39 /* do we still have anything to map */ 40 sz = sz - law_sz; 41 if (sz) { 42 start += law_sz; 43 44 start_align = 1ull << (__ffs64(start) - 1); 45 law_sz = min(start_align, sz); 46 law_sz_enc = __ilog2_u64(law_sz) - 1; 47 ecm = &immap->sysconf.ddrlaw[1]; 48 ecm->bar = start & 0xfffff000; 49 ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc)); 50 debug("DDR:bar=0x%08x\n", ecm->bar); 51 debug("DDR:ar=0x%08x\n", ecm->ar); 52 } else { 53 return 0; 54 } 55 56 /* do we still have anything to map */ 57 sz = sz - law_sz; 58 if (sz) 59 return 1; 60 61 return 0; 62 } 63