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Diffstat (limited to 'arch/powerpc/cpu/mpc83xx/law.c')
-rw-r--r--arch/powerpc/cpu/mpc83xx/law.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc83xx/law.c b/arch/powerpc/cpu/mpc83xx/law.c
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+++ b/arch/powerpc/cpu/mpc83xx/law.c
@@ -0,0 +1,61 @@
+/*
+ * 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>
+
+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;
+}