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 12int 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