soc/cavium: Enable MMU

* Configure and enable MMU.
* Cover the whole I/O space.
* A minimum of 512KB TTB space is required.
* Use secure mem attribute as firmware is running in ARM TZ region.

Tested on Cavium SoC.

Change-Id: I969446da62b4cc7adf9393fab69ff84ebf49220d
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25371
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/src/soc/cavium/cn81xx/mmu.c b/src/soc/cavium/cn81xx/mmu.c
new file mode 100644
index 0000000000..d6e7ac5ee1
--- /dev/null
+++ b/src/soc/cavium/cn81xx/mmu.c
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015         MediaTek Inc.
+ * Copyright 2018-present Facebook, Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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 <symbols.h>
+#include <soc/addressmap.h>
+#include <soc/mmu.h>
+#include <soc/sdram.h>
+#include <arch/mmu.h>
+
+void soc_mmu_init(void)
+{
+	const unsigned long devmem = MA_DEV | MA_S | MA_RW;
+	const unsigned long secure_mem = MA_MEM | MA_S | MA_RW;
+
+	mmu_init();
+
+	/*
+	 * Need to use secure mem attribute, as firmware is running in ARM TZ
+	 * region.
+	 */
+	mmu_config_range((void *)_ttb, _ttb_size, secure_mem);
+	mmu_config_range((void *)_dram, sdram_size_mb() * MiB, secure_mem);
+	/* IO space has the MSB set and is divided into 4 sub-regions:
+	 * * NCB
+	 * * SLI
+	 * * RSL
+	 * * AP
+	 */
+	mmu_config_range((void *)IO_SPACE_START, IO_SPACE_SIZE, devmem);
+
+	mmu_enable();
+}