mediatek/mt8173: Add MMU support

BRANCH=none
BUG=none
TEST=build pass

[pg: split into multiple commits]

Change-Id: Ib46b243102969e2860479070e19640fb6cb9bdd6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 3ee2a20ec56359e917bb8f4825846c54d4f6276a
Original-Change-Id: Iedc81a85569b00524620e9ba128e7d77f17b0405
Original-Signed-off-by: Jimmy Huang <jimmy.huang@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292666
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/12614
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/mediatek/mt8173/Makefile.inc

@@ -27,6 +27,7 @@ endif
 
 bootblock-y += gpio.c gpio_init.c pmic_wrap.c mt6391.c
 bootblock-y += wdt.c
+bootblock-y += mmu_operations.c
 
 ################################################################################
 
@@ -47,6 +48,7 @@ romstage-$(CONFIG_DRIVERS_UART) += uart.c
 romstage-y += cbmem.c
 romstage-y += spi.c
 romstage-y += gpio.c
+romstage-y += mmu_operations.c
 
 ################################################################################
 

src/soc/mediatek/mt8173/bootblock.c

@@ -14,6 +14,7 @@
  */
 
 #include <bootblock_common.h>
+#include <soc/mmu_operations.h>
 #include <soc/mt6391.h>
 #include <soc/pll.h>
 #include <soc/wdt.h>
@@ -28,6 +29,8 @@ void bootblock_soc_init(void)
 	/* post init pll */
 	mt_pll_post_init();
 
+	mt8173_mmu_init();
+
 	/* init watch dog, will disable AP watch dog */
 	mtk_wdt_init();
 }

src/soc/mediatek/mt8173/include/soc/mmu_operations.h

@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 MediaTek 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.
+ */
+
+#ifndef __SOC_MEDIATEK_MT8173_MMU_OPERATIONS_H__
+#define __SOC_MEDIATEK_MT8173_MMU_OPERATIONS_H__
+
+#include <arch/mmu.h>
+
+enum {
+	DEV_MEM		= MA_DEV | MA_S  | MA_RW,
+	CACHED_MEM	= MA_MEM | MA_NS | MA_RW,
+	SECURE_MEM	= MA_MEM | MA_S  | MA_RW,
+	UNCACHED_MEM	= MA_MEM | MA_NS | MA_RW | MA_MEM_NC,
+};
+
+extern unsigned char _sram_l2c[];
+extern unsigned char _esram_l2c[];
+#define _sram_l2c_size (_esram_l2c - _sram_l2c)
+
+void mt8173_mmu_init(void);
+void mt8173_mmu_after_dram(void);
+
+#endif //__SOC_MEDIATEK_MT8173_MMU_OPERATIONS_H__

src/soc/mediatek/mt8173/mmu_operations.c

@@ -0,0 +1,68 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 MediaTek 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 <arch/io.h>
+#include <arch/mmu.h>
+#include <console/console.h>
+#include <symbols.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <soc/addressmap.h>
+#include <soc/infracfg.h>
+#include <soc/mcucfg.h>
+#include <soc/mmu_operations.h>
+
+static const uint64_t dram_size = (uint64_t)CONFIG_DRAM_SIZE_MB * MiB;
+
+void mt8173_mmu_init(void)
+{
+	mmu_init();
+
+	/* Set 0x0 to end of dram as device memory */
+	mmu_config_range((void *)0, (uintptr_t)_dram + dram_size, DEV_MEM);
+
+	/* SRAM is cached */
+	mmu_config_range(_sram_l2c, _sram_l2c_size + _sram_size, CACHED_MEM);
+
+	/* DMA is non-cached and is reserved for TPM & da9212 I2C DMA */
+	mmu_config_range(_dma_coherent, _dma_coherent_size, UNCACHED_MEM);
+
+	/* set ttb as secure */
+	mmu_config_range(_ttb, _ttb_size, SECURE_MEM);
+
+	mmu_enable();
+}
+
+void mt8173_mmu_after_dram(void)
+{
+	/* Remap DRAM as cached now that it's up and running */
+	mmu_config_range(_dram, dram_size, CACHED_MEM);
+
+	/* Unmap L2C SRAM so it can be reclaimed by L2 cache */
+	/* TODO: Implement true unmapping, and also use it for the zero-page! */
+	mmu_config_range(_sram_l2c, _sram_l2c_size, DEV_MEM);
+
+	/* Careful: changing cache geometry while it's active is a bad idea! */
+	mmu_disable();
+
+	/* Return L2C SRAM back to L2 cache. Set it to 512KiB which is the max
+	 * available L2 cache for A53 in MT8173. */
+	write32(&mt8173_mcucfg->mp0_ca7l_cache_config, 3 << 8);
+	/* turn off the l2c sram clock */
+	write32(&mt8173_infracfg->infra_pdn0, L2C_SRAM_PDN);
+
+	/* Reenable MMU with now enlarged L2 cache. Page tables still valid. */
+	mmu_enable();
+}