1 files changed, 61 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc83xx/law.c b/arch/powerpc/cpu/mpc83xx/law.c
new file mode 100644
index 0000000000..66c88b697e
--- /dev/null
+++ 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;
+}