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-rw-r--r--arch/powerpc/mach-mpc85xx/fsl_law.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/powerpc/mach-mpc85xx/fsl_law.c b/arch/powerpc/mach-mpc85xx/fsl_law.c
new file mode 100644
index 0000000000..e3c765f30f
--- /dev/null
+++ b/arch/powerpc/mach-mpc85xx/fsl_law.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright 2012 GE Intelligent Platforms, Inc.
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <asm/config.h>
+#include <asm/fsl_law.h>
+#include <mach/ffs64.h>
+
+#define FSL_HW_NUM_LAWS FSL_NUM_LAWS
+
+#define LAW_BASE (CFG_IMMR + 0xc08)
+#define LAWAR_ADDR(x) ((u32 *)LAW_BASE + 8 * (x) + 2)
+#define LAWBAR_ADDR(x) ((u32 *)LAW_BASE + 8 * (x))
+#define LAWBAR_SHIFT 12
+
+static inline phys_addr_t fsl_get_law_base_addr(int idx)
+{
+ return (phys_addr_t)in_be32(LAWBAR_ADDR(idx)) << LAWBAR_SHIFT;
+}
+
+static inline void fsl_set_law_base_addr(int idx, phys_addr_t addr)
+{
+ out_be32(LAWBAR_ADDR(idx), addr >> LAWBAR_SHIFT);
+}
+
+static void fsl_set_law(u8 idx, phys_addr_t addr, enum law_size sz,
+ enum law_trgt_if id)
+{
+ out_be32(LAWAR_ADDR(idx), 0);
+ fsl_set_law_base_addr(idx, addr);
+ out_be32(LAWAR_ADDR(idx), LAW_EN | ((u32)id << 20) | (u32)sz);
+
+ /* Read back so that we sync the writes */
+ in_be32(LAWAR_ADDR(idx));
+}
+
+static int fsl_is_free_law(int idx)
+{
+ u32 lawar;
+
+ lawar = in_be32(LAWAR_ADDR(idx));
+ if (!(lawar & LAW_EN))
+ return 1;
+
+ return 0;
+}
+
+static void fsl_set_next_law(phys_addr_t addr, enum law_size sz,
+ enum law_trgt_if id)
+{
+ u32 idx;
+
+ for (idx = 0; idx < FSL_HW_NUM_LAWS; idx++) {
+ if (fsl_is_free_law(idx)) {
+ fsl_set_law(idx, addr, sz, id);
+ break;
+ }
+ }
+
+ if (idx >= FSL_HW_NUM_LAWS)
+ panic("No more LAWS available\n");
+}
+
+static void fsl_set_last_law(phys_addr_t addr, enum law_size sz,
+ enum law_trgt_if id)
+{
+ int idx;
+
+ for (idx = (FSL_HW_NUM_LAWS - 1); idx >= 0; idx--) {
+ if (fsl_is_free_law(idx)) {
+ fsl_set_law(idx, addr, sz, id);
+ break;
+ }
+ }
+
+ if (idx < 0)
+ panic("No more LAWS available\n");
+}
+
+/* use up to 2 LAWs for DDR, use the last available LAWs */
+int fsl_set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
+{
+ u64 start_align, law_sz;
+ int law_sz_enc;
+
+ if (start == 0)
+ start_align = 1ull << (LAW_SIZE_32G + 1);
+ else
+ start_align = 1ull << (ffs64(start) - 1);
+
+ law_sz = min(start_align, sz);
+ law_sz_enc = __ilog2_u64(law_sz) - 1;
+
+ fsl_set_last_law(start, law_sz_enc, id);
+
+ /* 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;
+
+ fsl_set_last_law(start, law_sz_enc, id);
+ } else {
+ return 0;
+ }
+
+ /* do we still have anything to map */
+ sz = sz - law_sz;
+ if (sz)
+ return 1;
+
+ return 0;
+}
+
+void fsl_init_laws(void)
+{
+ int i;
+
+ if (FSL_HW_NUM_LAWS > 32)
+ panic("FSL_HW_NUM_LAWS can not be > 32 w/o code changes");
+
+ for (i = 0; i < num_law_entries; i++) {
+ if (law_table[i].index == -1)
+ fsl_set_next_law(law_table[i].addr,
+ law_table[i].size,
+ law_table[i].trgt_id);
+ else
+ fsl_set_law(law_table[i].index, law_table[i].addr,
+ law_table[i].size, law_table[i].trgt_id);
+ }
+}