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https://github.com/AsahiLinux/u-boot
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62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
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/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <asm/fsl_law.h>
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#include <asm/mmu.h>
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int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
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{
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immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
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law83xx_t *ecm = &immap->sysconf.ddrlaw[0];
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u64 start_align, law_sz;
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int law_sz_enc;
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if (start == 0)
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start_align = 1ull << (LAW_SIZE_2G + 1);
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else
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start_align = 1ull << (ffs64(start) - 1);
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law_sz = min(start_align, sz);
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law_sz_enc = __ilog2_u64(law_sz) - 1;
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/*
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* Set up LAWBAR for all of DDR.
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*/
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ecm->bar = start & 0xfffff000;
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ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
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debug("DDR:bar=0x%08x\n", ecm->bar);
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debug("DDR:ar=0x%08x\n", ecm->ar);
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/* recalculate size based on what was actually covered by the law */
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law_sz = 1ull << __ilog2_u64(law_sz);
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/* do we still have anything to map */
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sz = sz - law_sz;
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if (sz) {
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start += law_sz;
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start_align = 1ull << (ffs64(start) - 1);
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law_sz = min(start_align, sz);
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law_sz_enc = __ilog2_u64(law_sz) - 1;
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ecm = &immap->sysconf.ddrlaw[1];
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ecm->bar = start & 0xfffff000;
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ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
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debug("DDR:bar=0x%08x\n", ecm->bar);
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debug("DDR:ar=0x%08x\n", ecm->ar);
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} else {
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return 0;
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}
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/* do we still have anything to map */
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sz = sz - law_sz;
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if (sz)
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return 1;
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return 0;
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}
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