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 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