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Diffstat (limited to 'src/mainboard/google/gale/mmu.c')
-rw-r--r--src/mainboard/google/gale/mmu.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/src/mainboard/google/gale/mmu.c b/src/mainboard/google/gale/mmu.c
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index 0000000000..4d2e9a0123
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+++ b/src/mainboard/google/gale/mmu.c
@@ -0,0 +1,68 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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 <arch/cache.h>
+#include <symbols.h>
+#include "mmu.h"
+
+/* convenient shorthand (in MB) */
+#define RPM_START ((uintptr_t)_rpm / KiB)
+#define RPM_END ((uintptr_t)_erpm / KiB)
+#define RPM_SIZE (RPM_END - RPM_START)
+#define SRAM_START ((uintptr_t)_sram / KiB)
+#define SRAM_END ((uintptr_t)_esram / KiB)
+#define DRAM_START ((uintptr_t)_dram / MiB)
+#define DRAM_SIZE (CONFIG_DRAM_SIZE_MB)
+#define DRAM_END (DRAM_START + DRAM_SIZE)
+
+/* DMA memory for drivers */
+#define DMA_START ((uintptr_t)_dma_coherent / MiB)
+#define DMA_SIZE (_dma_coherent_size / MiB)
+
+void setup_dram_mappings(enum dram_state dram)
+{
+ if (dram == DRAM_INITIALIZED) {
+ mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK);
+ /* Map DMA memory */
+ mmu_config_range(DMA_START, DMA_SIZE, DCACHE_OFF);
+ } else {
+ mmu_disable_range(DRAM_START, DRAM_SIZE);
+ /* Map DMA memory */
+ mmu_disable_range(DMA_START, DMA_SIZE);
+ }
+}
+
+void setup_mmu(enum dram_state dram)
+{
+ dcache_mmu_disable();
+
+ /* start with mapping everything as strongly ordered. */
+ mmu_config_range(0, 4096, DCACHE_OFF);
+
+ /* Map Device memory. */
+ mmu_config_range_kb(RPM_START, RPM_SIZE, DCACHE_OFF);
+
+ mmu_config_range_kb(SRAM_START, SRAM_END - SRAM_START,
+ DCACHE_WRITEBACK);
+
+ /* Map DRAM memory */
+ setup_dram_mappings(dram);
+
+ mmu_disable_range(DRAM_END, 4096 - DRAM_END);
+
+ /* disable Page 0 for trapping NULL pointer references. */
+ mmu_disable_range_kb(0, 1);
+
+ mmu_init();
+
+ dcache_mmu_enable();
+}