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/*
* Copyright 2011 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*/
#include <common.h>
#include <asm/fsl_law.h>
#include <asm/mmu.h>
#include <linux/log2.h>
int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
{
immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
law83xx_t *ecm = &immap->sysconf.ddrlaw[0];
u64 start_align, law_sz;
int law_sz_enc;
if (start == 0)
start_align = 1ull << (LAW_SIZE_2G + 1);
else
start_align = 1ull << (__ffs64(start) - 1);
law_sz = min(start_align, sz);
law_sz_enc = __ilog2_u64(law_sz) - 1;
/*
* Set up LAWBAR for all of DDR.
*/
ecm->bar = start & 0xfffff000;
ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
debug("DDR:bar=0x%08x\n", ecm->bar);
debug("DDR:ar=0x%08x\n", ecm->ar);
/* recalculate size based on what was actually covered by the law */
law_sz = 1ull << __ilog2_u64(law_sz);
/* do we still have anything to map */
sz = sz - law_sz;
if (sz) {
start += law_sz;
start_align = 1ull << (__ffs64(start) - 1);
law_sz = min(start_align, sz);
law_sz_enc = __ilog2_u64(law_sz) - 1;
ecm = &immap->sysconf.ddrlaw[1];
ecm->bar = start & 0xfffff000;
ecm->ar = (LAWAR_EN | (id << 20) | (LAWAR_SIZE & law_sz_enc));
debug("DDR:bar=0x%08x\n", ecm->bar);
debug("DDR:ar=0x%08x\n", ecm->ar);
} else {
return 0;
}
/* do we still have anything to map */
sz = sz - law_sz;
if (sz)
return 1;
return 0;
}
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