coreboot t132,rush: Add mainboard specific bootblock_init

Pull in mainboard specific bootblock_init function from nyan into
rush. Additionally, pull in all files required for proper compilation of rush
after adding the bootblock_init function

BUG=None
BRANCH=None
TEST=Compiles successfully for rush

Original-Change-Id: I69c736275f66eca3ad92f97d166e91d4c2301364
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/205583
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit e7aac547026717d7380f71593010e3ea34ecea51)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Ie26f91f8caaa06af3b195246febcdc70b9fe9795
Reviewed-on: http://review.coreboot.org/8570
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

18 files changed, 1898 insertions, 0 deletions

diff --git a/src/mainboard/google/rush/Kconfig b/src/mainboard/google/rush/Kconfig
index 9e36cacffd..5f7ae163d0 100644
--- a/src/mainboard/google/rush/Kconfig
+++ b/src/mainboard/google/rush/Kconfig
@@ -22,8 +22,10 @@ if BOARD_GOOGLE_RUSH
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select SOC_NVIDIA_TEGRA132
+	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select BOARD_ROMSIZE_KB_4096
 
+
 config MAINBOARD_DIR
 	string
 	default google/rush
diff --git a/src/mainboard/google/rush/Makefile.inc b/src/mainboard/google/rush/Makefile.inc
index a0bd819442..4c6273f99f 100644
--- a/src/mainboard/google/rush/Makefile.inc
+++ b/src/mainboard/google/rush/Makefile.inc
@@ -27,6 +27,12 @@ $(obj)/generated/bct.cfg:
 
 subdirs-y += bct
 
+bootblock-y += boardid.c
+bootblock-y += bootblock.c
+bootblock-y += pmic.c
+bootblock-y += reset.c
+
 romstage-y += romstage.c
+romstage-y += reset.c
 
 ramstage-y += mainboard.c
\ No newline at end of file
diff --git a/src/mainboard/google/rush/boardid.c b/src/mainboard/google/rush/boardid.c
new file mode 100644
index 0000000000..76bd4d9a84
--- /dev/null
+++ b/src/mainboard/google/rush/boardid.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <soc/nvidia/tegra132/gpio.h>
+
+#include "boardid.h"
+
+uint8_t board_id(void)
+{
+	static int id = -1;
+
+	if (id < 0) {
+		id = gpio_get_in_value(GPIO(Q3)) << 0 |
+		     gpio_get_in_value(GPIO(T1)) << 1 |
+		     gpio_get_in_value(GPIO(X1)) << 2 |
+		     gpio_get_in_value(GPIO(X4)) << 3;
+		printk(BIOS_SPEW, "Board ID: %#x.\n", id);
+	}
+
+	return id;
+}
diff --git a/src/mainboard/google/rush/boardid.h b/src/mainboard/google/rush/boardid.h
new file mode 100644
index 0000000000..aa2ea5f903
--- /dev/null
+++ b/src/mainboard/google/rush/boardid.h
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MAINBOARD_GOOGLE_RUSH_BOARDID_H__
+#define __MAINBOARD_GOOGLE_RUSH_BOARDID_H__
+
+#include <stdint.h>
+
+uint8_t board_id(void);
+
+#endif /* __MAINBOARD_GOOGLE_RUSH_BOARDID_H__ */
diff --git a/src/mainboard/google/rush/bootblock.c b/src/mainboard/google/rush/bootblock.c
new file mode 100644
index 0000000000..51fe9b3e99
--- /dev/null
+++ b/src/mainboard/google/rush/bootblock.c
@@ -0,0 +1,90 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <bootblock_common.h>
+#include <console/console.h>
+#include <device/i2c.h>
+#include <soc/addressmap.h>
+#include <soc/clock.h>
+#include <soc/nvidia/tegra/i2c.h>
+#include <soc/nvidia/tegra132/clk_rst.h>
+#include <soc/nvidia/tegra132/gpio.h>
+#include <soc/nvidia/tegra132/pinmux.h>
+#include <soc/nvidia/tegra132/spi.h>	/* FIXME: move back to soc code? */
+
+#include "pmic.h"
+
+static struct clk_rst_ctlr *clk_rst = (void *)TEGRA_CLK_RST_BASE;
+
+static void set_clock_sources(void)
+{
+	/* UARTA gets PLLP, deactivate CLK_UART_DIV_OVERRIDE */
+	writel(PLLP << CLK_SOURCE_SHIFT, &clk_rst->clk_src_uarta);
+
+	clock_configure_source(mselect, PLLP, 102000);
+
+	/* The PMIC is on I2C5 and can run at 400 KHz. */
+	clock_configure_i2c_scl_freq(i2c5, PLLP, 400);
+
+	/* TODO: We should be able to set this to 50MHz, but that did not seem
+	 * reliable. */
+	clock_configure_source(sbc4, PLLP, 33333);
+}
+
+void bootblock_mainboard_init(void)
+{
+	set_clock_sources();
+
+	clock_enable_clear_reset(CLK_L_CACHE2 | CLK_L_TMR,
+				 CLK_H_I2C5 | CLK_H_APBDMA,
+				 0, CLK_V_MSELECT, 0, 0);
+
+	// Board ID GPIOs, bits 0-3.
+	gpio_input(GPIO(Q3));
+	gpio_input(GPIO(T1));
+	gpio_input(GPIO(X1));
+	gpio_input(GPIO(X4));
+
+	// I2C5 (PMU) clock.
+	pinmux_set_config(PINMUX_PWR_I2C_SCL_INDEX,
+			  PINMUX_PWR_I2C_SCL_FUNC_I2CPMU | PINMUX_INPUT_ENABLE);
+	// I2C5 (PMU) data.
+	pinmux_set_config(PINMUX_PWR_I2C_SDA_INDEX,
+			  PINMUX_PWR_I2C_SDA_FUNC_I2CPMU | PINMUX_INPUT_ENABLE);
+	i2c_init(4);
+	pmic_init(4);
+
+	/* SPI4 data out (MOSI) */
+	pinmux_set_config(PINMUX_GPIO_PG6_INDEX,
+			  PINMUX_GPIO_PG6_FUNC_SPI4 | PINMUX_INPUT_ENABLE |
+			  PINMUX_PULL_UP);
+	/* SPI4 data in (MISO) */
+	pinmux_set_config(PINMUX_GPIO_PG7_INDEX,
+			  PINMUX_GPIO_PG7_FUNC_SPI4 | PINMUX_INPUT_ENABLE |
+			  PINMUX_PULL_UP);
+	/* SPI4 clock */
+	pinmux_set_config(PINMUX_GPIO_PG5_INDEX,
+			  PINMUX_GPIO_PG5_FUNC_SPI4 | PINMUX_INPUT_ENABLE);
+	/* SPI4 chip select 0 */
+	pinmux_set_config(PINMUX_GPIO_PI3_INDEX,
+			  PINMUX_GPIO_PI3_FUNC_SPI4 | PINMUX_INPUT_ENABLE);
+
+	tegra_spi_init(4);
+}
diff --git a/src/mainboard/google/rush/pmic.c b/src/mainboard/google/rush/pmic.c
new file mode 100644
index 0000000000..c114066e8e
--- /dev/null
+++ b/src/mainboard/google/rush/pmic.c
@@ -0,0 +1,116 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright (c) 2013, NVIDIA CORPORATION.  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 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <delay.h>
+#include <device/i2c.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "boardid.h"
+#include "pmic.h"
+#include "reset.h"
+
+enum {
+	AS3722_I2C_ADDR = 0x40
+};
+
+struct as3722_init_reg {
+	u8 reg;
+	u8 val;
+	u8 delay;
+};
+
+static struct as3722_init_reg init_list[] = {
+	{AS3722_SDO0, 0x3C, 1},
+	{AS3722_SDO1, 0x32, 0},
+	{AS3722_LDO3, 0x59, 0},
+	{AS3722_SDO2, 0x3C, 0},
+	{AS3722_SDO3, 0x00, 0},
+	{AS3722_SDO4, 0x00, 0},
+	{AS3722_SDO5, 0x50, 0},
+	{AS3722_SDO6, 0x28, 1},
+	{AS3722_LDO0, 0x8A, 0},
+	{AS3722_LDO1, 0x00, 0},
+	{AS3722_LDO2, 0x10, 0},
+	{AS3722_LDO4, 0x00, 0},
+	{AS3722_LDO5, 0x00, 0},
+	{AS3722_LDO6, 0x00, 0},
+	{AS3722_LDO7, 0x00, 0},
+	{AS3722_LDO9, 0x00, 0},
+	{AS3722_LDO10, 0x00, 0},
+	{AS3722_LDO11, 0x00, 1},
+};
+
+static void pmic_write_reg(unsigned bus, uint8_t reg, uint8_t val, int do_delay)
+{
+	if (i2c_writeb(bus, AS3722_I2C_ADDR, reg, val)) {
+		printk(BIOS_ERR, "%s: reg = 0x%02X, value = 0x%02X failed!\n",
+			__func__, reg, val);
+		/* Reset the SoC on any PMIC write error */
+		cpu_reset();
+	} else {
+		if (do_delay)
+			udelay(500);
+	}
+}
+
+static void pmic_slam_defaults(unsigned bus)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(init_list); i++) {
+		struct as3722_init_reg *reg = &init_list[i];
+		pmic_write_reg(bus, reg->reg, reg->val, reg->delay);
+	}
+}
+
+void pmic_init(unsigned bus)
+{
+	/*
+	 * Don't need to set up VDD_CORE - already done - by OTP
+	 * Don't write SDCONTROL - it's already 0x7F, i.e. all SDs enabled.
+	 * Don't write LDCONTROL - it's already 0xFF, i.e. all LDOs enabled.
+	 */
+
+	/* Restore PMIC POR defaults, in case kernel changed 'em */
+	pmic_slam_defaults(bus);
+
+	/* First set VDD_CPU to 1.2V, then enable the VDD_CPU regulator. */
+	if (board_id() == 0)
+		pmic_write_reg(bus, 0x00, 0x3c, 1);
+	else
+		pmic_write_reg(bus, 0x00, 0x50, 1);
+
+	/* First set VDD_GPU to 1.0V, then enable the VDD_GPU regulator. */
+	pmic_write_reg(bus, 0x06, 0x28, 1);
+
+	/*
+	 * First set +1.2V_GEN_AVDD to 1.2V, then enable the +1.2V_GEN_AVDD
+	 * regulator.
+	 */
+	pmic_write_reg(bus, 0x12, 0x10, 1);
+
+	/*
+	 * Panel power GPIO O4. Set mode for GPIO4 (0x0c to 7), then set
+	 * the value (register 0x20 bit 4)
+	 */
+	pmic_write_reg(bus, 0x0c, 0x07, 0);
+	pmic_write_reg(bus, 0x20, 0x10, 1);
+}
diff --git a/src/mainboard/google/rush/pmic.h b/src/mainboard/google/rush/pmic.h
new file mode 100644
index 0000000000..b56c513416
--- /dev/null
+++ b/src/mainboard/google/rush/pmic.h
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MAINBOARD_GOOGLE_RUSH_PMIC_H__
+#define __MAINBOARD_GOOGLE_RUSH_PMIC_H__
+
+enum {
+	AS3722_SDO0 = 0,
+	AS3722_SDO1,
+	AS3722_SDO2,
+	AS3722_SDO3,
+	AS3722_SDO4,
+	AS3722_SDO5,
+	AS3722_SDO6,
+
+	AS3722_LDO0 = 0x10,
+	AS3722_LDO1,
+	AS3722_LDO2,
+	AS3722_LDO3,
+	AS3722_LDO4,
+	AS3722_LDO5,
+	AS3722_LDO6,
+	AS3722_LDO7,
+
+	AS3722_LDO9 = 0x19,
+	AS3722_LDO10,
+	AS3722_LDO11,
+};
+
+void pmic_init(unsigned bus);
+
+#endif /* __MAINBOARD_GOOGLE_RUSH_PMIC_H__ */
diff --git a/src/mainboard/google/rush/reset.c b/src/mainboard/google/rush/reset.c
new file mode 100644
index 0000000000..381634078b
--- /dev/null
+++ b/src/mainboard/google/rush/reset.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <soc/nvidia/tegra132/gpio.h>
+
+#include "reset.h"
+
+void cpu_reset(void)
+{
+        gpio_output(GPIO(I5), 0);
+        while(1);
+}
diff --git a/src/mainboard/google/rush/reset.h b/src/mainboard/google/rush/reset.h
new file mode 100644
index 0000000000..be723ce316
--- /dev/null
+++ b/src/mainboard/google/rush/reset.h
@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MAINBOARD_GOOGLE_RUSH_BOOTBLOCK_H__
+#define __MAINBOARD_GOOGLE_RUSH_BOOTBLOCK_H__
+
+void cpu_reset(void);
+
+#endif /* __MAINBOARD_GOOGLE_RUSH_BOOTBLOCK_H__ */
diff --git a/src/soc/nvidia/tegra132/Makefile.inc b/src/soc/nvidia/tegra132/Makefile.inc
index af33e2d1dc..abcdfd599e 100644
--- a/src/soc/nvidia/tegra132/Makefile.inc
+++ b/src/soc/nvidia/tegra132/Makefile.inc
@@ -3,7 +3,12 @@ bootblock-y += bootblock_asm.S
 bootblock-y += cbfs.c
 bootblock-y += timer.c
 bootblock-y += clock.c
+bootblock-y += spi.c
+bootblock-y += i2c.c
+bootblock-y += dma.c
+bootblock-y += monotonic_timer.c
 bootblock-y += ../tegra/gpio.c
+bootblock-y += ../tegra/i2c.c
 bootblock-y += ../tegra/pingroup.c
 bootblock-y += ../tegra/pinmux.c
 bootblock-y += ../tegra/apbmisc.c
@@ -15,7 +20,12 @@ romstage-y += cbfs.c
 romstage-y += cbmem.c
 romstage-y += timer.c
 romstage-y += clock.c
+romstage-y += spi.c
+romstage-y += i2c.c
+romstage-y += dma.c
+romstage-y += monotonic_timer.c
 romstage-y += ../tegra/gpio.c
+romstage-y += ../tegra/i2c.c
 romstage-y += ../tegra/pinmux.c
 romstage-$(CONFIG_DRIVERS_UART) += uart.c
 
@@ -23,7 +33,12 @@ ramstage-y += cbfs.c
 ramstage-y += cbmem.c
 ramstage-y += timer.c
 ramstage-y += clock.c
+ramstage-y += spi.c
+ramstage-y += i2c.c
+ramstage-y += dma.c
+ramstage-y += monotonic_timer.c
 ramstage-y += ../tegra/gpio.c
+ramstage-y += ../tegra/i2c.c
 ramstage-y += ../tegra/pinmux.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
 
diff --git a/src/soc/nvidia/tegra132/bootblock.c b/src/soc/nvidia/tegra132/bootblock.c
index 3544c65c08..f377bc1ee0 100644
--- a/src/soc/nvidia/tegra132/bootblock.c
+++ b/src/soc/nvidia/tegra132/bootblock.c
@@ -59,5 +59,7 @@ void main(void)
 
 	clock_init();
 
+	bootblock_mainboard_init();
+
 	while(1);
 }
diff --git a/src/soc/nvidia/tegra132/dma.c b/src/soc/nvidia/tegra132/dma.c
new file mode 100644
index 0000000000..3f236c3e22
--- /dev/null
+++ b/src/soc/nvidia/tegra132/dma.c
@@ -0,0 +1,149 @@
+/*
+ * (C) Copyright 2010,2011
+ * NVIDIA Corporation <www.nvidia.com>
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <console/console.h>
+
+#include <arch/io.h>
+#include <soc/addressmap.h>
+
+#include "dma.h"
+
+struct apb_dma * const apb_dma = (struct apb_dma *)TEGRA_APB_DMA_BASE;
+
+#define APB_DMA_OFFSET(n) \
+		(struct apb_dma_channel_regs *)(TEGRA_APB_DMA_BASE + n)
+struct apb_dma_channel apb_dma_channels[] = {
+	{ .num = 0, .regs = APB_DMA_OFFSET(0x1000) },
+	{ .num = 1, .regs = APB_DMA_OFFSET(0x1040) },
+	{ .num = 2, .regs = APB_DMA_OFFSET(0x1080) },
+	{ .num = 3, .regs = APB_DMA_OFFSET(0x10c0) },
+	{ .num = 4, .regs = APB_DMA_OFFSET(0x1100) },
+	{ .num = 5, .regs = APB_DMA_OFFSET(0x1140) },
+	{ .num = 6, .regs = APB_DMA_OFFSET(0x1180) },
+	{ .num = 7, .regs = APB_DMA_OFFSET(0x11c0) },
+	{ .num = 8, .regs = APB_DMA_OFFSET(0x1200) },
+	{ .num = 9, .regs = APB_DMA_OFFSET(0x1240) },
+	{ .num = 10, .regs = APB_DMA_OFFSET(0x1280) },
+	{ .num = 11, .regs = APB_DMA_OFFSET(0x12c0) },
+	{ .num = 12, .regs = APB_DMA_OFFSET(0x1300) },
+	{ .num = 13, .regs = APB_DMA_OFFSET(0x1340) },
+	{ .num = 14, .regs = APB_DMA_OFFSET(0x1380) },
+	{ .num = 15, .regs = APB_DMA_OFFSET(0x13c0) },
+	{ .num = 16, .regs = APB_DMA_OFFSET(0x1400) },
+	{ .num = 17, .regs = APB_DMA_OFFSET(0x1440) },
+	{ .num = 18, .regs = APB_DMA_OFFSET(0x1480) },
+	{ .num = 19, .regs = APB_DMA_OFFSET(0x14c0) },
+	{ .num = 20, .regs = APB_DMA_OFFSET(0x1500) },
+	{ .num = 21, .regs = APB_DMA_OFFSET(0x1540) },
+	{ .num = 22, .regs = APB_DMA_OFFSET(0x1580) },
+	{ .num = 23, .regs = APB_DMA_OFFSET(0x15c0) },
+	{ .num = 24, .regs = APB_DMA_OFFSET(0x1600) },
+	{ .num = 25, .regs = APB_DMA_OFFSET(0x1640) },
+	{ .num = 26, .regs = APB_DMA_OFFSET(0x1680) },
+	{ .num = 27, .regs = APB_DMA_OFFSET(0x16c0) },
+	{ .num = 28, .regs = APB_DMA_OFFSET(0x1700) },
+	{ .num = 29, .regs = APB_DMA_OFFSET(0x1740) },
+	{ .num = 30, .regs = APB_DMA_OFFSET(0x1780) },
+	{ .num = 31, .regs = APB_DMA_OFFSET(0x17c0) },
+};
+
+int dma_busy(struct apb_dma_channel * const channel)
+{
+	/*
+	 * In continuous mode, the BSY_n bit in APB_DMA_STATUS and
+	 * BSY in APBDMACHAN_CHANNEL_n_STA_0 will remain set as '1' so long
+	 * as the channel is enabled. So for this function we'll use the
+	 * DMA_ACTIVITY bit.
+	 */
+	return read32(&channel->regs->sta) & APB_STA_DMA_ACTIVITY ? 1 : 0;
+}
+/* claim a DMA channel */
+struct apb_dma_channel * const dma_claim(void)
+{
+	int i;
+	struct apb_dma_channel_regs *regs = NULL;
+
+	/*
+	 * Set global enable bit, otherwise register access to channel
+	 * DMA registers will not be possible.
+	 */
+	setbits_le32(&apb_dma->command, APB_COMMAND_GEN);
+
+	for (i = 0; i < ARRAY_SIZE(apb_dma_channels); i++) {
+		regs = apb_dma_channels[i].regs;
+
+		if (!apb_dma_channels[i].in_use) {
+			u32 status = read32(&regs->sta);
+			if (status & (1 << i)) {
+				/* FIXME: should this be fatal? */
+				printk(BIOS_DEBUG, "%s: DMA channel %d busy?\n",
+						__func__, i);
+			}
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(apb_dma_channels))
+		return NULL;
+
+	apb_dma_channels[i].in_use = 1;
+	return &apb_dma_channels[i];
+}
+
+/* release a DMA channel */
+void dma_release(struct apb_dma_channel * const channel)
+{
+	int i;
+
+	/* FIXME: make this "thread" friendly */
+	while (dma_busy(channel))
+		;
+
+	channel->in_use = 0;
+
+	/* clear the global enable bit if no channels are in use */
+	for (i = 0; i < ARRAY_SIZE(apb_dma_channels); i++) {
+		if (apb_dma_channels[i].in_use)
+			return;
+	}
+
+	clrbits_le32(&apb_dma->command, APB_COMMAND_GEN);
+}
+
+int dma_start(struct apb_dma_channel * const channel)
+{
+	struct apb_dma_channel_regs *regs = channel->regs;
+
+	/* Set ENB bit for this channel */
+	setbits_le32(&regs->csr, APB_CSR_ENB);
+
+	return 0;
+}
+
+int dma_stop(struct apb_dma_channel * const channel)
+{
+	struct apb_dma_channel_regs *regs = channel->regs;
+
+	/* Clear ENB bit for this channel */
+	clrbits_le32(&regs->csr, APB_CSR_ENB);
+
+	return 0;
+}
diff --git a/src/soc/nvidia/tegra132/dma.h b/src/soc/nvidia/tegra132/dma.h
new file mode 100644
index 0000000000..7b07cbc89b
--- /dev/null
+++ b/src/soc/nvidia/tegra132/dma.h
@@ -0,0 +1,190 @@
+/*
+ * (C) Copyright 2010,2011
+ * NVIDIA Corporation <www.nvidia.com>
+ *  Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVIDIA_TEGRA132_DMA_H__
+#define __NVIDIA_TEGRA132_DMA_H__
+
+#include <inttypes.h>
+#include <soc/addressmap.h>
+
+/*
+ * The DMA engine operates on 4 bytes at a time, so make sure any data
+ * passed via DMA is aligned to avoid underrun/overrun.
+ */
+#define TEGRA_DMA_ALIGN_BYTES	4
+
+/*
+ * Note: Many APB DMA controller registers are laid out such that each
+ * bit controls or represents the status for the corresponding channel.
+ * So we will not bother to list each individual bit in this case.
+ */
+#define APB_COMMAND_GEN			(1 << 31)
+
+#define APB_CNTRL_REG_COUNT_VALUE_MASK	0xffff
+#define APB_CNTRL_REG_COUNT_VALUE_SHIFT	0
+
+/*
+ * Note: Many APB DMA controller registers are laid out such that each
+ * bit controls or represents the status for the corresponding channel.
+ * So we will not bother to list each individual bit in this case.
+ */
+#define APB_COMMAND_GEN			(1 << 31)
+
+#define APB_CNTRL_REG_COUNT_VALUE_MASK	0xffff
+#define APB_CNTRL_REG_COUNT_VALUE_SHIFT	0
+struct apb_dma {
+	u32 command;		/* 0x00 */
+	u32 status;		/* 0x04 */
+	u32 rsvd1[2];
+	u32 cntrl_reg;		/* 0x10 */
+	u32 irq_sta_cpu;	/* 0x14 */
+	u32 irq_sta_cop;	/* 0x18 */
+	u32 irq_mask;		/* 0x1c */
+	u32 irq_mask_set;	/* 0x20 */
+	u32 irq_mask_clr;	/* 0x24 */
+	u32 trig_reg;		/* 0x28 */
+	u32 channel_trig_reg;	/* 0x2c */
+	u32 dma_status;		/* 0x30 */
+	u32 channel_en_reg;	/* 0x34 */
+	u32 security_reg;	/* 0x38 */
+	u32 channel_swid;	/* 0x3c */
+	u32 rsvd[1];
+	u32 chan_wt_reg0;	/* 0x44 */
+	u32 chan_wt_reg1;	/* 0x48 */
+	u32 chan_wt_reg2;	/* 0x4c */
+	u32 chan_wr_reg3;	/* 0x50 */
+	u32 channel_swid1;	/* 0x54 */
+} __attribute__((packed));
+check_member(apb_dma, channel_swid1, 0x54);
+
+/*
+ * Naming in the doc included a superfluous _CHANNEL_n_ for
+ * each entry and was left out for the sake of conciseness.
+ */
+#define APB_CSR_ENB			(1 << 31)
+#define APB_CSR_IE_EOC			(1 << 30)
+#define APB_CSR_HOLD			(1 << 29)
+#define APB_CSR_DIR			(1 << 28)
+#define APB_CSR_ONCE			(1 << 27)
+#define APB_CSR_FLOW			(1 << 21)
+#define APB_CSR_REQ_SEL_MASK		0x1f
+#define APB_CSR_REQ_SEL_SHIFT		16
+
+enum apbdmachan_req_sel {
+	APBDMA_SLAVE_CNTR_REQ	= 0,
+	APBDMA_SLAVE_APBIF_CH0	= 1,
+	APBDMA_SLAVE_APBIF_CH1	= 2,
+	APBDMA_SLAVE_APBIF_CH2	= 3,
+	APBDMA_SLAVE_APBIF_CH3	= 4,
+	APBDMA_SLAVE_HSI	= 5,
+	APBDMA_SLAVE_APBIF_CH4	= 6,
+	APBDMA_SLAVE_APBIF_CH5	= 7,
+	APBDMA_SLAVE_UART_A	= 8,
+	APBDMA_SLAVE_UART_B	= 9,
+	APBDMA_SLAVE_UART_C	= 10,
+	APBDMA_SLAVE_DTV	= 11,
+	APBDMA_SLAVE_APBIF_CH6	= 12,
+	APBDMA_SLAVE_APBIF_CH7	= 13,
+	APBDMA_SLAVE_APBIF_CH8	= 14,
+	APBDMA_SLAVE_SL2B1	= 15,
+	APBDMA_SLAVE_SL2B2	= 16,
+	APBDMA_SLAVE_SL2B3	= 17,
+	APBDMA_SLAVE_SL2B4	= 18,
+	APBDMA_SLAVE_UART_D	= 19,
+	APBDMA_SLAVE_UART_E	= 20,
+	APBDMA_SLAVE_I2C	= 21,
+	APBDMA_SLAVE_I2C2	= 22,
+	APBDMA_SLAVE_I2C3	= 23,
+	APBDMA_SLAVE_DVC_I2C	= 24,
+	APBDMA_SLAVE_OWR	= 25,
+	APBDMA_SLAVE_I2C4	= 26,
+	APBDMA_SLAVE_SL2B5	= 27,
+	APBDMA_SLAVE_SL2B6	= 28,
+	APBDMA_SLAVE_APBIF_CH9	= 29,
+	APBDMA_SLAVE_I2C6	= 30,
+	APBDMA_SLAVE_NA31	= 31,
+};
+
+#define APB_STA_BSY			(1 << 31)
+#define APB_STA_ISE_EOC			(1 << 30)
+#define APB_STA_HALT			(1 << 29)
+#define APB_STA_PING_PONG_STA		(1 << 28)
+#define APB_STA_DMA_ACTIVITY		(1 << 27)
+#define APB_STA_CHANNEL_PAUSE		(1 << 26)
+
+#define APB_CSRE_CHANNEL_PAUSE		(1 << 31)
+#define APB_CSRE_TRIG_SEL_MASK		0x3f
+#define APB_CSRE_TRIG_SEL_SHIFT		14
+
+#define AHB_PTR_MASK			(0x3fffffff)
+#define AHB_PTR_SHIFT			2
+
+#define AHB_SEQ_INTR_ENB		(1 << 31)
+#define AHB_BUS_WIDTH_MASK		0x7
+#define AHB_BUS_WIDTH_SHIFT		28
+#define AHB_DATA_SWAP			(1 << 27)
+#define AHB_BURST_MASK			0x7
+#define AHB_BURST_SHIFT			24
+#define AHB_SEQ_DBL_BUF			(1 << 19)
+#define AHB_SEQ_WRAP_MASK		0x7
+#define AHB_SEQ_WRAP_SHIFT		16
+
+#define APB_PTR_MASK			0x3fffffff
+#define APB_PTR_SHIFT			2
+
+#define APB_BUS_WIDTH_MASK		0x7
+#define APB_BUS_WIDTH_SHIFT		28
+#define APB_DATA_SWAP			(1 << 27)
+#define APB_ADDR_WRAP_MASK		0x7
+#define APB_ADDR_WRAP_SHIFT		16
+
+#define APB_WORD_TRANSFER_MASK		0x0fffffff
+#define APB_WORD_TRANSFER_SHIFT		2
+
+struct apb_dma_channel_regs {
+	u32 csr;		/* 0x00 */
+	u32 sta;		/* 0x04 */
+	u32 dma_byte_sta;	/* 0x08 */
+	u32 csre;		/* 0x0c */
+	u32 ahb_ptr;		/* 0x10 */
+	u32 ahb_seq;		/* 0x14 */
+	u32 apb_ptr;		/* 0x18 */
+	u32 apb_seq;		/* 0x1c */
+	u32 wcount;		/* 0x20 */
+	u32 word_transfer;	/* 0x24 */
+} __attribute__((packed));
+check_member(apb_dma_channel_regs, word_transfer, 0x24);
+
+struct apb_dma_channel {
+	const int num;
+	struct apb_dma_channel_regs *regs;
+
+	/*
+	 * Basic high-level semaphore that can be used to "claim"
+	 * a DMA channel e.g. by SPI, I2C, or other peripheral driver.
+	 */
+	int in_use;
+};
+
+struct apb_dma_channel * const dma_claim(void);
+void dma_release(struct apb_dma_channel * const channel);
+int dma_start(struct apb_dma_channel * const channel);
+int dma_stop(struct apb_dma_channel * const channel);
+int dma_busy(struct apb_dma_channel * const channel);
+
+#endif	/* __NVIDIA_TEGRA132_DMA_H__ */
diff --git a/src/soc/nvidia/tegra132/gpio.h b/src/soc/nvidia/tegra132/gpio.h
new file mode 100644
index 0000000000..5563d65c77
--- /dev/null
+++ b/src/soc/nvidia/tegra132/gpio.h
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __SOC_NVIDIA_TEGRA132_GPIO_H__
+#define __SOC_NVIDIA_TEGRA132_GPIO_H__
+
+#include <soc/nvidia/tegra/gpio.h>
+#include <stdint.h>
+
+#include "pinmux.h"	/* for pinmux constants in GPIO macro */
+
+/* GPIO index constants. */
+
+#define GPIO_PORT_CONSTANTS(port) \
+	GPIO_##port##0_INDEX, GPIO_##port##1_INDEX, GPIO_##port##2_INDEX, \
+	GPIO_##port##3_INDEX, GPIO_##port##4_INDEX, GPIO_##port##5_INDEX, \
+	GPIO_##port##6_INDEX, GPIO_##port##7_INDEX
+
+enum {
+	GPIO_PORT_CONSTANTS(A),
+	GPIO_PORT_CONSTANTS(B),
+	GPIO_PORT_CONSTANTS(C),
+	GPIO_PORT_CONSTANTS(D),
+	GPIO_PORT_CONSTANTS(E),
+	GPIO_PORT_CONSTANTS(F),
+	GPIO_PORT_CONSTANTS(G),
+	GPIO_PORT_CONSTANTS(H),
+	GPIO_PORT_CONSTANTS(I),
+	GPIO_PORT_CONSTANTS(J),
+	GPIO_PORT_CONSTANTS(K),
+	GPIO_PORT_CONSTANTS(L),
+	GPIO_PORT_CONSTANTS(M),
+	GPIO_PORT_CONSTANTS(N),
+	GPIO_PORT_CONSTANTS(O),
+	GPIO_PORT_CONSTANTS(P),
+	GPIO_PORT_CONSTANTS(Q),
+	GPIO_PORT_CONSTANTS(R),
+	GPIO_PORT_CONSTANTS(S),
+	GPIO_PORT_CONSTANTS(T),
+	GPIO_PORT_CONSTANTS(U),
+	GPIO_PORT_CONSTANTS(V),
+	GPIO_PORT_CONSTANTS(W),
+	GPIO_PORT_CONSTANTS(X),
+	GPIO_PORT_CONSTANTS(Y),
+	GPIO_PORT_CONSTANTS(Z),
+	GPIO_PORT_CONSTANTS(AA),
+	GPIO_PORT_CONSTANTS(BB),
+	GPIO_PORT_CONSTANTS(CC),
+	GPIO_PORT_CONSTANTS(DD),
+	GPIO_PORT_CONSTANTS(EE),
+	GPIO_PORT_CONSTANTS(FF)
+};
+
+#endif	/* __SOC_NVIDIA_TEGRA132_GPIO_H__ */
diff --git a/src/soc/nvidia/tegra132/i2c.c b/src/soc/nvidia/tegra132/i2c.c
new file mode 100644
index 0000000000..eada743914
--- /dev/null
+++ b/src/soc/nvidia/tegra132/i2c.c
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <soc/addressmap.h>
+#include <soc/clock.h>
+#include <soc/nvidia/tegra/i2c.h>
+
+struct tegra_i2c_bus_info tegra_i2c_info[] = {
+	{
+		.base = (void *)TEGRA_I2C_BASE,
+		.reset_bit = CLK_L_I2C1,
+		.reset_func = &clock_reset_l
+	},
+	{
+		.base = (void *)TEGRA_I2C2_BASE,
+		.reset_bit = CLK_H_I2C2,
+		.reset_func = &clock_reset_h
+	},
+	{
+		.base = (void *)TEGRA_I2C3_BASE,
+		.reset_bit = CLK_U_I2C3,
+		.reset_func = &clock_reset_u
+	},
+	{
+		.base = (void *)TEGRA_I2C4_BASE,
+		.reset_bit = CLK_V_I2C4,
+		.reset_func = &clock_reset_v
+	},
+	{
+		.base = (void *)TEGRA_I2C5_BASE,
+		.reset_bit = CLK_H_I2C5,
+		.reset_func = &clock_reset_h
+	},
+	{
+		.base = (void *)TEGRA_I2C6_BASE,
+		.reset_bit = CLK_X_I2C6,
+		.reset_func = &clock_reset_x
+	}
+};
diff --git a/src/soc/nvidia/tegra132/monotonic_timer.c b/src/soc/nvidia/tegra132/monotonic_timer.c
new file mode 100644
index 0000000000..d6c30b4ffa
--- /dev/null
+++ b/src/soc/nvidia/tegra132/monotonic_timer.c
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <soc/addressmap.h>
+#include <timer.h>
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+	mono_time_set_usecs(mt, read32((void *)TEGRA_TMRUS_BASE));
+}
diff --git a/src/soc/nvidia/tegra132/spi.c b/src/soc/nvidia/tegra132/spi.c
new file mode 100644
index 0000000000..f1be207ced
--- /dev/null
+++ b/src/soc/nvidia/tegra132/spi.c
@@ -0,0 +1,936 @@
+/*
+ * NVIDIA Tegra SPI controller (T114 and later)
+ *
+ * Copyright (c) 2010-2013 NVIDIA Corporation
+ * Copyright (C) 2013 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <assert.h>
+#include <cbfs.h>
+#include <cbfs_core.h>
+#include <inttypes.h>
+#include <spi-generic.h>
+#include <spi_flash.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <timer.h>
+#include <arch/cache.h>
+#include <arch/io.h>
+#include <console/console.h>
+#include <soc/addressmap.h>
+#include <delay.h>
+
+#include "dma.h"
+#include "spi.h"
+
+#if defined(CONFIG_DEBUG_SPI) && CONFIG_DEBUG_SPI
+# define DEBUG_SPI(x,...)	printk(BIOS_DEBUG, "TEGRA_SPI: " x)
+#else
+# define DEBUG_SPI(x,...)
+#endif
+
+/*
+ * 64 packets in FIFO mode, BLOCK_SIZE packets in DMA mode. Packets can vary
+ * in size from 4 to 32 bits. To keep things simple we'll use 8-bit packets.
+ */
+#define SPI_PACKET_SIZE_BYTES		1
+#define SPI_MAX_TRANSFER_BYTES_FIFO	(64 * SPI_PACKET_SIZE_BYTES)
+#define SPI_MAX_TRANSFER_BYTES_DMA	(65535 * SPI_PACKET_SIZE_BYTES)
+
+/*
+ * This is used to workaround an issue seen where it may take some time for
+ * packets to show up in the FIFO after they have been received and the
+ * BLOCK_COUNT has been incremented.
+ */
+#define SPI_FIFO_XFER_TIMEOUT_US	1000
+
+/* COMMAND1 */
+#define SPI_CMD1_GO			(1 << 31)
+#define SPI_CMD1_M_S			(1 << 30)
+#define SPI_CMD1_MODE_MASK		0x3
+#define SPI_CMD1_MODE_SHIFT		28
+#define SPI_CMD1_CS_SEL_MASK		0x3
+#define SPI_CMD1_CS_SEL_SHIFT		26
+#define SPI_CMD1_CS_POL_INACTIVE3	(1 << 25)
+#define SPI_CMD1_CS_POL_INACTIVE2	(1 << 24)
+#define SPI_CMD1_CS_POL_INACTIVE1	(1 << 23)
+#define SPI_CMD1_CS_POL_INACTIVE0	(1 << 22)
+#define SPI_CMD1_CS_SW_HW		(1 << 21)
+#define SPI_CMD1_CS_SW_VAL		(1 << 20)
+#define SPI_CMD1_IDLE_SDA_MASK		0x3
+#define SPI_CMD1_IDLE_SDA_SHIFT		18
+#define SPI_CMD1_BIDIR			(1 << 17)
+#define SPI_CMD1_LSBI_FE		(1 << 16)
+#define SPI_CMD1_LSBY_FE		(1 << 15)
+#define SPI_CMD1_BOTH_EN_BIT		(1 << 14)
+#define SPI_CMD1_BOTH_EN_BYTE		(1 << 13)
+#define SPI_CMD1_RX_EN			(1 << 12)
+#define SPI_CMD1_TX_EN			(1 << 11)
+#define SPI_CMD1_PACKED			(1 << 5)
+#define SPI_CMD1_BIT_LEN_MASK		0x1f
+#define SPI_CMD1_BIT_LEN_SHIFT		0
+
+/* COMMAND2 */
+#define SPI_CMD2_TX_CLK_TAP_DELAY	(1 << 6)
+#define SPI_CMD2_TX_CLK_TAP_DELAY_MASK	(0x3F << 6)
+#define SPI_CMD2_RX_CLK_TAP_DELAY	(1 << 0)
+#define SPI_CMD2_RX_CLK_TAP_DELAY_MASK	(0x3F << 0)
+
+/* SPI_TRANS_STATUS */
+#define SPI_STATUS_RDY			(1 << 30)
+#define SPI_STATUS_SLV_IDLE_COUNT_MASK	0xff
+#define SPI_STATUS_SLV_IDLE_COUNT_SHIFT	16
+#define SPI_STATUS_BLOCK_COUNT		0xffff
+#define SPI_STATUS_BLOCK_COUNT_SHIFT	0
+
+/* SPI_FIFO_STATUS */
+#define SPI_FIFO_STATUS_CS_INACTIVE			(1 << 31)
+#define SPI_FIFO_STATUS_FRAME_END			(1 << 30)
+#define SPI_FIFO_STATUS_RX_FIFO_FULL_COUNT_MASK		0x7f
+#define SPI_FIFO_STATUS_RX_FIFO_FULL_COUNT_SHIFT	23
+#define SPI_FIFO_STATUS_TX_FIFO_EMPTY_COUNT_MASK	0x7f
+#define SPI_FIFO_STATUS_TX_FIFO_EMPTY_COUNT_SHIFT	16
+#define SPI_FIFO_STATUS_RX_FIFO_FLUSH			(1 << 15)
+#define SPI_FIFO_STATUS_TX_FIFO_FLUSH			(1 << 14)
+#define SPI_FIFO_STATUS_ERR				(1 << 8)
+#define SPI_FIFO_STATUS_TX_FIFO_OVF			(1 << 7)
+#define SPI_FIFO_STATUS_TX_FIFO_UNR			(1 << 6)
+#define SPI_FIFO_STATUS_RX_FIFO_OVF			(1 << 5)
+#define SPI_FIFO_STATUS_RX_FIFO_UNR			(1 << 4)
+#define SPI_FIFO_STATUS_TX_FIFO_FULL			(1 << 3)
+#define SPI_FIFO_STATUS_TX_FIFO_EMPTY			(1 << 2)
+#define SPI_FIFO_STATUS_RX_FIFO_FULL			(1 << 1)
+#define SPI_FIFO_STATUS_RX_FIFO_EMPTY			(1 << 0)
+
+/* SPI_DMA_CTL */
+#define SPI_DMA_CTL_DMA			(1 << 31)
+#define SPI_DMA_CTL_CONT		(1 << 30)
+#define SPI_DMA_CTL_IE_RX		(1 << 29)
+#define SPI_DMA_CTL_IE_TX		(1 << 28)
+#define SPI_DMA_CTL_RX_TRIG_MASK	0x3
+#define SPI_DMA_CTL_RX_TRIG_SHIFT	19
+#define SPI_DMA_CTL_TX_TRIG_MASK	0x3
+#define SPI_DMA_CTL_TX_TRIG_SHIFT	15
+
+/* SPI_DMA_BLK */
+#define SPI_DMA_CTL_BLOCK_SIZE_MASK	0xffff
+#define SPI_DMA_CTL_BLOCK_SIZE_SHIFT	0
+
+static struct tegra_spi_channel tegra_spi_channels[] = {
+	/*
+	 * Note: Tegra pinmux must be setup for corresponding SPI channel in
+	 * order for its registers to be accessible. If pinmux has not been
+	 * set up, access to the channel's registers will simply hang.
+	 *
+	 * TODO(dhendrix): Clarify or remove this comment (is clock setup
+	 * necessary first, or just pinmux, or both?)
+	 */
+	{
+		.slave = { .bus = 1, },
+		.regs = (struct tegra_spi_regs *)TEGRA_SPI1_BASE,
+		.req_sel = APBDMA_SLAVE_SL2B1,
+	},
+	{
+		.slave = { .bus = 2, },
+		.regs = (struct tegra_spi_regs *)TEGRA_SPI2_BASE,
+		.req_sel = APBDMA_SLAVE_SL2B2,
+	},
+	{
+		.slave = { .bus = 3, },
+		.regs = (struct tegra_spi_regs *)TEGRA_SPI3_BASE,
+		.req_sel = APBDMA_SLAVE_SL2B3,
+	},
+	{
+		.slave = { .bus = 4, },
+		.regs = (struct tegra_spi_regs *)TEGRA_SPI4_BASE,
+		.req_sel = APBDMA_SLAVE_SL2B4,
+	},
+	{
+		.slave = { .bus = 5, },
+		.regs = (struct tegra_spi_regs *)TEGRA_SPI5_BASE,
+		.req_sel = APBDMA_SLAVE_SL2B5,
+	},
+	{
+		.slave = { .bus = 6, },
+		.regs = (struct tegra_spi_regs *)TEGRA_SPI6_BASE,
+		.req_sel = APBDMA_SLAVE_SL2B6,
+	},
+};
+
+enum spi_direction {
+	SPI_SEND,
+	SPI_RECEIVE,
+};
+
+struct tegra_spi_channel *tegra_spi_init(unsigned int bus)
+{
+	int i;
+	struct tegra_spi_channel *spi = NULL;
+
+	for (i = 0; i < ARRAY_SIZE(tegra_spi_channels); i++) {
+		if (tegra_spi_channels[i].slave.bus == bus) {
+			spi = &tegra_spi_channels[i];
+			break;
+		}
+	}
+	if (!spi)
+		return NULL;
+
+	/* software drives chip-select, set value to high */
+	setbits_le32(&spi->regs->command1,
+			SPI_CMD1_CS_SW_HW | SPI_CMD1_CS_SW_VAL);
+
+	/* 8-bit transfers, unpacked mode, most significant bit first */
+	clrbits_le32(&spi->regs->command1,
+			SPI_CMD1_BIT_LEN_MASK | SPI_CMD1_PACKED);
+	setbits_le32(&spi->regs->command1, 7 << SPI_CMD1_BIT_LEN_SHIFT);
+
+	return spi;
+}
+
+static struct tegra_spi_channel * const to_tegra_spi(int bus) {
+	return &tegra_spi_channels[bus - 1];
+}
+
+static unsigned int tegra_spi_speed(unsigned int bus)
+{
+	/* FIXME: implement this properly, for now use max value (50MHz) */
+	return 50000000;
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	struct tegra_spi_regs *regs = to_tegra_spi(slave->bus)->regs;
+	u32 val;
+
+	tegra_spi_init(slave->bus);
+
+	val = read32(&regs->command1);
+
+	/* select appropriate chip-select line */
+	val &= ~(SPI_CMD1_CS_SEL_MASK << SPI_CMD1_CS_SEL_SHIFT);
+	val |= (slave->cs << SPI_CMD1_CS_SEL_SHIFT);
+
+	/* drive chip-select with the inverse of the "inactive" value */
+	if (val & (SPI_CMD1_CS_POL_INACTIVE0 << slave->cs))
+		val &= ~SPI_CMD1_CS_SW_VAL;
+	else
+		val |= SPI_CMD1_CS_SW_VAL;
+
+	write32(val, &regs->command1);
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	struct tegra_spi_regs *regs = to_tegra_spi(slave->bus)->regs;
+	u32 val;
+
+	val = read32(&regs->command1);
+
+	if (val & (SPI_CMD1_CS_POL_INACTIVE0 << slave->cs))
+		val |= SPI_CMD1_CS_SW_VAL;
+	else
+		val &= ~SPI_CMD1_CS_SW_VAL;
+
+	write32(val, &regs->command1);
+}
+
+static void dump_fifo_status(struct tegra_spi_channel *spi)
+{
+	u32 status = read32(&spi->regs->fifo_status);
+
+	printk(BIOS_INFO, "Raw FIFO status: 0x%08x\n", status);
+	if (status & SPI_FIFO_STATUS_TX_FIFO_OVF)
+		printk(BIOS_INFO, "\tTx overflow detected\n");
+	if (status & SPI_FIFO_STATUS_TX_FIFO_UNR)
+		printk(BIOS_INFO, "\tTx underrun detected\n");
+	if (status & SPI_FIFO_STATUS_RX_FIFO_OVF)
+		printk(BIOS_INFO, "\tRx overflow detected\n");
+	if (status & SPI_FIFO_STATUS_RX_FIFO_UNR)
+		printk(BIOS_INFO, "\tRx underrun detected\n");
+
+	printk(BIOS_INFO, "TX_FIFO: 0x%08x, TX_DATA: 0x%08x\n",
+		read32(&spi->regs->tx_fifo), read32(&spi->regs->tx_data));
+	printk(BIOS_INFO, "RX_FIFO: 0x%08x, RX_DATA: 0x%08x\n",
+		read32(&spi->regs->rx_fifo), read32(&spi->regs->rx_data));
+}
+
+static void clear_fifo_status(struct tegra_spi_channel *spi)
+{
+	clrbits_le32(&spi->regs->fifo_status,
+				SPI_FIFO_STATUS_ERR |
+				SPI_FIFO_STATUS_TX_FIFO_OVF |
+				SPI_FIFO_STATUS_TX_FIFO_UNR |
+				SPI_FIFO_STATUS_RX_FIFO_OVF |
+				SPI_FIFO_STATUS_RX_FIFO_UNR);
+}
+
+static void dump_spi_regs(struct tegra_spi_channel *spi)
+{
+	printk(BIOS_INFO, "SPI regs:\n"
+			"\tdma_blk: 0x%08x\n"
+			"\tcommand1: 0x%08x\n"
+			"\tdma_ctl: 0x%08x\n"
+			"\ttrans_status: 0x%08x\n",
+			read32(&spi->regs->dma_blk),
+			read32(&spi->regs->command1),
+			read32(&spi->regs->dma_ctl),
+			read32(&spi->regs->trans_status));
+}
+
+static void dump_dma_regs(struct apb_dma_channel *dma)
+{
+	printk(BIOS_INFO, "DMA regs:\n"
+			"\tahb_ptr: 0x%08x\n"
+			"\tapb_ptr: 0x%08x\n"
+			"\tahb_seq: 0x%08x\n"
+			"\tapb_seq: 0x%08x\n"
+			"\tcsr: 0x%08x\n"
+			"\tcsre: 0x%08x\n"
+			"\twcount: 0x%08x\n"
+			"\tdma_byte_sta: 0x%08x\n"
+			"\tword_transfer: 0x%08x\n",
+			read32(&dma->regs->ahb_ptr),
+			read32(&dma->regs->apb_ptr),
+			read32(&dma->regs->ahb_seq),
+			read32(&dma->regs->apb_seq),
+			read32(&dma->regs->csr),
+			read32(&dma->regs->csre),
+			read32(&dma->regs->wcount),
+			read32(&dma->regs->dma_byte_sta),
+			read32(&dma->regs->word_transfer));
+}
+
+static inline unsigned int spi_byte_count(struct tegra_spi_channel *spi)
+{
+	/* FIXME: Make this take total packet size into account */
+	return read32(&spi->regs->trans_status) &
+		(SPI_STATUS_BLOCK_COUNT << SPI_STATUS_BLOCK_COUNT_SHIFT);
+}
+
+/*
+ * This calls udelay() with a calculated value based on the SPI speed and
+ * number of bytes remaining to be transferred. It assumes that if the
+ * calculated delay period is less than MIN_DELAY_US then it is probably
+ * not worth the overhead of yielding.
+ */
+#define MIN_DELAY_US 250
+static void spi_delay(struct tegra_spi_channel *spi,
+				unsigned int bytes_remaining)
+{
+	unsigned int ns_per_byte, delay_us;
+
+	ns_per_byte = 1000000000 / (tegra_spi_speed(spi->slave.bus) / 8);
+	delay_us = (ns_per_byte * bytes_remaining) / 1000;
+
+	if (delay_us < MIN_DELAY_US)
+		return;
+
+	udelay(delay_us);
+}
+
+static void tegra_spi_wait(struct tegra_spi_channel *spi)
+{
+	unsigned int count, dma_blk;
+
+	dma_blk = 1 + (read32(&spi->regs->dma_blk) &
+		(SPI_DMA_CTL_BLOCK_SIZE_MASK << SPI_DMA_CTL_BLOCK_SIZE_SHIFT));
+
+	while ((count = spi_byte_count(spi)) != dma_blk)
+		spi_delay(spi, dma_blk - count);
+}
+
+
+static int fifo_error(struct tegra_spi_channel *spi)
+{
+	return read32(&spi->regs->fifo_status) & SPI_FIFO_STATUS_ERR ? 1 : 0;
+}
+
+static int tegra_spi_pio_prepare(struct tegra_spi_channel *spi,
+			unsigned int bytes, enum spi_direction dir)
+{
+	u8 *p = spi->out_buf;
+	unsigned int todo = MIN(bytes, SPI_MAX_TRANSFER_BYTES_FIFO);
+	u32 flush_mask, enable_mask;
+
+	if (dir == SPI_SEND) {
+		flush_mask = SPI_FIFO_STATUS_TX_FIFO_FLUSH;
+		enable_mask = SPI_CMD1_TX_EN;
+	} else {
+		flush_mask = SPI_FIFO_STATUS_RX_FIFO_FLUSH;
+		enable_mask = SPI_CMD1_RX_EN;
+	}
+
+	setbits_le32(&spi->regs->fifo_status, flush_mask);
+	while (read32(&spi->regs->fifo_status) & flush_mask)
+		;
+
+	setbits_le32(&spi->regs->command1, enable_mask);
+
+	/* BLOCK_SIZE in SPI_DMA_BLK register applies to both DMA and
+	 * PIO transfers */
+	write32(todo - 1, &spi->regs->dma_blk);
+
+	if (dir == SPI_SEND) {
+		unsigned int to_fifo = bytes;
+		while (to_fifo) {
+			write32(*p, &spi->regs->tx_fifo);
+			p++;
+			to_fifo--;
+		}
+	}
+
+	return todo;
+}
+
+static void tegra_spi_pio_start(struct tegra_spi_channel *spi)
+{
+	setbits_le32(&spi->regs->trans_status, SPI_STATUS_RDY);
+	setbits_le32(&spi->regs->command1, SPI_CMD1_GO);
+	/* Make sure the write to command1 completes. */
+	read32(&spi->regs->command1);
+}
+
+static inline u32 rx_fifo_count(struct tegra_spi_channel *spi)
+{
+	return (read32(&spi->regs->fifo_status) >>
+		SPI_FIFO_STATUS_RX_FIFO_FULL_COUNT_SHIFT) &
+		SPI_FIFO_STATUS_RX_FIFO_FULL_COUNT_MASK;
+}
+
+static int tegra_spi_pio_finish(struct tegra_spi_channel *spi)
+{
+	u8 *p = spi->in_buf;
+	struct mono_time start;
+	struct rela_time rt;
+
+	clrbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN | SPI_CMD1_TX_EN);
+
+	/*
+	 * Allow some time in case the Rx FIFO does not yet have
+	 * all packets pushed into it. See chrome-os-partner:24215.
+	 */
+	timer_monotonic_get(&start);
+	do {
+		if (rx_fifo_count(spi) == spi_byte_count(spi))
+			break;
+		rt = current_time_from(&start);
+	} while (rela_time_in_microseconds(&rt) < SPI_FIFO_XFER_TIMEOUT_US);
+
+	while (!(read32(&spi->regs->fifo_status) &
+				SPI_FIFO_STATUS_RX_FIFO_EMPTY)) {
+		*p = read8(&spi->regs->rx_fifo);
+		p++;
+	}
+
+	if (fifo_error(spi)) {
+		printk(BIOS_ERR, "%s: ERROR:\n", __func__);
+		dump_spi_regs(spi);
+		dump_fifo_status(spi);
+		return -1;
+	}
+
+	return 0;
+}
+
+static void setup_dma_params(struct tegra_spi_channel *spi,
+				struct apb_dma_channel *dma)
+{
+	/* APB bus width = 8-bits, address wrap for each word */
+	clrbits_le32(&dma->regs->apb_seq,
+			APB_BUS_WIDTH_MASK << APB_BUS_WIDTH_SHIFT);
+	/* AHB 1 word burst, bus width = 32 bits (fixed in hardware),
+	 * no address wrapping */
+	clrsetbits_le32(&dma->regs->ahb_seq,
+			(AHB_BURST_MASK << AHB_BURST_SHIFT),
+			4 << AHB_BURST_SHIFT);
+
+	/* Set ONCE mode to transfer one "block" at a time (64KB) and enable
+	 * flow control. */
+	clrbits_le32(&dma->regs->csr,
+			APB_CSR_REQ_SEL_MASK << APB_CSR_REQ_SEL_SHIFT);
+	setbits_le32(&dma->regs->csr, APB_CSR_ONCE | APB_CSR_FLOW |
+			(spi->req_sel << APB_CSR_REQ_SEL_SHIFT));
+}
+
+static int tegra_spi_dma_prepare(struct tegra_spi_channel *spi,
+		unsigned int bytes, enum spi_direction dir)
+{
+	unsigned int todo, wcount;
+
+	/*
+	 * For DMA we need to think of things in terms of word count.
+	 * AHB width is fixed at 32-bits. To avoid overrunning
+	 * the in/out buffers we must align down. (Note: lowest 2-bits
+	 * in WCOUNT register are ignored, and WCOUNT seems to count
+	 * words starting at n-1)
+	 *
+	 * Example: If "bytes" is 7 and we are transferring 1-byte at a time,
+	 * WCOUNT should be 4. The remaining 3 bytes must be transferred
+	 * using PIO.
+	 */
+	todo = MIN(bytes, SPI_MAX_TRANSFER_BYTES_DMA - TEGRA_DMA_ALIGN_BYTES);
+	todo = ALIGN_DOWN(todo, TEGRA_DMA_ALIGN_BYTES);
+	wcount = ALIGN_DOWN(todo - TEGRA_DMA_ALIGN_BYTES, TEGRA_DMA_ALIGN_BYTES);
+
+	if (dir == SPI_SEND) {
+		spi->dma_out = dma_claim();
+		if (!spi->dma_out)
+			return -1;
+
+		/* ensure bytes to send will be visible to DMA controller */
+		dcache_clean_by_mva(spi->out_buf, bytes);
+
+		write32((uintptr_t)&spi->regs->tx_fifo, &spi->dma_out->regs->apb_ptr);
+		write32((uintptr_t)spi->out_buf, &spi->dma_out->regs->ahb_ptr);
+		setbits_le32(&spi->dma_out->regs->csr, APB_CSR_DIR);
+		setup_dma_params(spi, spi->dma_out);
+		write32(wcount, &spi->dma_out->regs->wcount);
+	} else {
+		spi->dma_in = dma_claim();
+		if (!spi->dma_in)
+			return -1;
+
+		/* avoid data collisions */
+		dcache_clean_invalidate_by_mva(spi->in_buf, bytes);
+
+		write32((uintptr_t)&spi->regs->rx_fifo, &spi->dma_in->regs->apb_ptr);
+		write32((uintptr_t)spi->in_buf, &spi->dma_in->regs->ahb_ptr);
+		clrbits_le32(&spi->dma_in->regs->csr, APB_CSR_DIR);
+		setup_dma_params(spi, spi->dma_in);
+		write32(wcount, &spi->dma_in->regs->wcount);
+	}
+
+	/* BLOCK_SIZE starts at n-1 */
+	write32(todo - 1, &spi->regs->dma_blk);
+	return todo;
+}
+
+static void tegra_spi_dma_start(struct tegra_spi_channel *spi)
+{
+	/*
+	 * The RDY bit in SPI_TRANS_STATUS needs to be cleared manually
+	 * (set bit to clear) between each transaction. Otherwise the next
+	 * transaction does not start.
+	 */
+	setbits_le32(&spi->regs->trans_status, SPI_STATUS_RDY);
+
+	if (spi->dma_out)
+		setbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN);
+	if (spi->dma_in)
+		setbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN);
+
+	/*
+	 * To avoid underrun conditions, enable APB DMA before SPI DMA for
+	 * Tx and enable SPI DMA before APB DMA before Rx.
+	 */
+	if (spi->dma_out)
+		dma_start(spi->dma_out);
+	setbits_le32(&spi->regs->dma_ctl, SPI_DMA_CTL_DMA);
+	if (spi->dma_in)
+		dma_start(spi->dma_in);
+
+
+}
+
+static int tegra_spi_dma_finish(struct tegra_spi_channel *spi)
+{
+	int ret;
+	unsigned int todo;
+
+	todo = read32(&spi->dma_in->regs->wcount);
+
+	if (spi->dma_in) {
+		while ((read32(&spi->dma_in->regs->dma_byte_sta) < todo) ||
+				dma_busy(spi->dma_in))
+			;	/* this shouldn't take long, no udelay */
+		dma_stop(spi->dma_in);
+		clrbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN);
+		dma_release(spi->dma_in);
+	}
+
+	if (spi->dma_out) {
+		while ((read32(&spi->dma_out->regs->dma_byte_sta) < todo) ||
+				dma_busy(spi->dma_out))
+			spi_delay(spi, todo - spi_byte_count(spi));
+		clrbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN);
+		dma_stop(spi->dma_out);
+		dma_release(spi->dma_out);
+	}
+
+	if (fifo_error(spi)) {
+		printk(BIOS_ERR, "%s: ERROR:\n", __func__);
+		dump_dma_regs(spi->dma_out);
+		dump_dma_regs(spi->dma_in);
+		dump_spi_regs(spi);
+		dump_fifo_status(spi);
+		ret = -1;
+		goto done;
+	}
+
+	ret = 0;
+done:
+	spi->dma_in = NULL;
+	spi->dma_out = NULL;
+	return ret;
+}
+
+/*
+ * xfer_setup() prepares a transfer. It does sanity checking, alignment, and
+ * sets transfer mode used by this channel (if not set already).
+ *
+ * A few caveats to watch out for:
+ * - The number of bytes which can be transferred may be smaller than the
+ *   number of bytes the caller specifies. The number of bytes ready for
+ *   a transfer will be returned (unless an error occurs).
+ *
+ * - Only one mode can be used for both RX and TX. The transfer mode of the
+ *   SPI channel (spi->xfer_mode) is checked each time this function is called.
+ *   If conflicting modes are detected, spi->xfer_mode will be set to
+ *   XFER_MODE_NONE and an error will be returned.
+ *
+ * Returns bytes ready for transfer if successful, <0 to indicate error.
+ */
+static int xfer_setup(struct tegra_spi_channel *spi, void *buf,
+		unsigned int bytes, enum spi_direction dir)
+{
+	unsigned int line_size = dcache_line_bytes();
+	unsigned int align;
+	int ret = -1;
+
+	if (!bytes)
+		return 0;
+
+	if (dir == SPI_SEND)
+		spi->out_buf = buf;
+	else if (dir == SPI_RECEIVE)
+		spi->in_buf = buf;
+
+	/*
+	 * Alignment consideratons:
+	 * When we enable caching we'll need to clean/invalidate portions of
+	 * memory. So we need to be careful about memory alignment. Also, DMA
+	 * likes to operate on 4-bytes at a time on the AHB side. So for
+	 * example, if we only want to receive 1 byte, 4 bytes will be be
+	 * written in memory even if those extra 3 bytes are beyond the length
+	 * we want.
+	 *
+	 * For now we'll use PIO to send/receive unaligned bytes. We may
+	 * consider setting aside some space for a kind of bounce buffer to
+	 * stay in DMA mode once we have a chance to benchmark the two
+	 * approaches.
+	 */
+
+	if (bytes < line_size) {
+		if (spi->xfer_mode == XFER_MODE_DMA) {
+			spi->xfer_mode = XFER_MODE_NONE;
+			ret = -1;
+		} else {
+			spi->xfer_mode = XFER_MODE_PIO;
+			ret = tegra_spi_pio_prepare(spi, bytes, dir);
+		}
+		goto done;
+	}
+
+	/* transfer bytes before the aligned boundary */
+	align = line_size - ((uintptr_t)buf % line_size);
+	if ((align != 0) && (align != line_size)) {
+		if (spi->xfer_mode == XFER_MODE_DMA) {
+			spi->xfer_mode = XFER_MODE_NONE;
+			ret = -1;
+		} else {
+			spi->xfer_mode = XFER_MODE_PIO;
+			ret = tegra_spi_pio_prepare(spi, align, dir);
+		}
+		goto done;
+	}
+
+	/* do aligned DMA transfer */
+	align = (((uintptr_t)buf + bytes) % line_size);
+	if (bytes - align > 0) {
+		unsigned int dma_bytes = bytes - align;
+
+		if (spi->xfer_mode == XFER_MODE_PIO) {
+			spi->xfer_mode = XFER_MODE_NONE;
+			ret = -1;
+		} else {
+			spi->xfer_mode = XFER_MODE_DMA;
+			ret = tegra_spi_dma_prepare(spi, dma_bytes, dir);
+		}
+
+		goto done;
+	}
+
+	/* transfer any remaining unaligned bytes */
+	if (align) {
+		if (spi->xfer_mode == XFER_MODE_DMA) {
+			spi->xfer_mode = XFER_MODE_NONE;
+			ret = -1;
+		} else {
+			spi->xfer_mode = XFER_MODE_PIO;
+			ret = tegra_spi_pio_prepare(spi, align, dir);
+		}
+		goto done;
+	}
+
+done:
+	return ret;
+}
+
+static void xfer_start(struct tegra_spi_channel *spi)
+{
+	if (spi->xfer_mode == XFER_MODE_DMA)
+		tegra_spi_dma_start(spi);
+	else
+		tegra_spi_pio_start(spi);
+}
+
+static void xfer_wait(struct tegra_spi_channel *spi)
+{
+	tegra_spi_wait(spi);
+}
+
+static int xfer_finish(struct tegra_spi_channel *spi)
+{
+	int ret;
+
+	if (spi->xfer_mode == XFER_MODE_DMA)
+		ret = tegra_spi_dma_finish(spi);
+	else
+		ret = tegra_spi_pio_finish(spi);
+
+	spi->xfer_mode = XFER_MODE_NONE;
+	return ret;
+}
+
+int spi_xfer(struct spi_slave *slave, const void *dout,
+		unsigned int out_bytes, void *din, unsigned int in_bytes)
+{
+	struct tegra_spi_channel *spi = to_tegra_spi(slave->bus);
+	u8 *out_buf = (u8 *)dout;
+	u8 *in_buf = (u8 *)din;
+	unsigned int todo;
+	int ret = 0;
+
+	/* tegra bus numbers start at 1 */
+	ASSERT(slave->bus >= 1 && slave->bus <= ARRAY_SIZE(tegra_spi_channels));
+
+	while (out_bytes || in_bytes) {
+		int x = 0;
+
+		if (out_bytes == 0)
+			todo = in_bytes;
+		else if (in_bytes == 0)
+			todo = out_bytes;
+		else
+			todo = MIN(out_bytes, in_bytes);
+
+		if (out_bytes) {
+			x = xfer_setup(spi, out_buf, todo, SPI_SEND);
+			if (x < 0) {
+				if (spi->xfer_mode == XFER_MODE_NONE) {
+					spi->xfer_mode = XFER_MODE_PIO;
+					continue;
+				} else {
+					ret = -1;
+					break;
+				}
+			}
+		}
+		if (in_bytes) {
+			x = xfer_setup(spi, in_buf, todo, SPI_RECEIVE);
+			if (x < 0) {
+				if (spi->xfer_mode == XFER_MODE_NONE) {
+					spi->xfer_mode = XFER_MODE_PIO;
+					continue;
+				} else {
+					ret = -1;
+					break;
+				}
+			}
+		}
+
+		/*
+		 * Note: Some devices (such as Chrome EC) are sensitive to
+		 * delays, so be careful when adding debug prints not to
+		 * cause timeouts between transfers.
+		 */
+		xfer_start(spi);
+		xfer_wait(spi);
+		if (xfer_finish(spi)) {
+			ret = -1;
+			break;
+		}
+
+		/* Post-processing. */
+		if (out_bytes) {
+			out_bytes -= x;
+			out_buf += x;
+		}
+		if (in_bytes) {
+			in_bytes -= x;
+			in_buf += x;
+		}
+	}
+
+	if (ret < 0) {
+		printk(BIOS_ERR, "%s: Error detected\n", __func__);
+		printk(BIOS_ERR, "Transaction size: %u, bytes remaining: "
+				"%u out / %u in\n", todo, out_bytes, in_bytes);
+		clear_fifo_status(spi);
+	}
+	return ret;
+}
+
+/* SPI as CBFS media. */
+struct tegra_spi_media {
+	struct spi_slave *slave;
+	struct cbfs_simple_buffer buffer;
+};
+
+static int tegra_spi_cbfs_open(struct cbfs_media *media)
+{
+	DEBUG_SPI("tegra_spi_cbfs_open\n");
+	return 0;
+}
+
+static int tegra_spi_cbfs_close(struct cbfs_media *media)
+{
+	DEBUG_SPI("tegra_spi_cbfs_close\n");
+	return 0;
+}
+
+#define JEDEC_READ			0x03
+#define JEDEC_READ_OUTSIZE		0x04
+#define JEDEC_FAST_READ_DUAL		0x3b
+#define JEDEC_FAST_READ_DUAL_OUTSIZE	0x05
+
+static size_t tegra_spi_cbfs_read(struct cbfs_media *media, void *dest,
+				   size_t offset, size_t count)
+{
+	struct tegra_spi_media *spi = (struct tegra_spi_media *)media->context;
+	u8 spi_read_cmd[JEDEC_FAST_READ_DUAL_OUTSIZE];
+	unsigned int read_cmd_bytes;
+	int ret = count;
+	struct tegra_spi_channel *channel;
+
+	channel = to_tegra_spi(spi->slave->bus);
+
+	if (channel->dual_mode) {
+		/*
+		 * Command 0x3b will interleave data only, command 0xbb will
+		 * interleave the address as well. It's nice to see the address
+		 * plainly when debugging, and we're mostly concerned with
+		 * large transfers so the optimization of using 0xbb isn't
+		 * really worthwhile.
+		 */
+		spi_read_cmd[0] = JEDEC_FAST_READ_DUAL;
+		spi_read_cmd[4] = 0x00;	/* dummy byte */
+		read_cmd_bytes = JEDEC_FAST_READ_DUAL_OUTSIZE;
+	} else {
+		spi_read_cmd[0] = JEDEC_READ;
+		read_cmd_bytes = JEDEC_READ_OUTSIZE;
+	}
+	spi_read_cmd[1] = (offset >> 16) & 0xff;
+	spi_read_cmd[2] = (offset >> 8) & 0xff;
+	spi_read_cmd[3] = offset & 0xff;
+
+	spi_claim_bus(spi->slave);
+
+	if (spi_xfer(spi->slave, spi_read_cmd,
+			read_cmd_bytes, NULL, 0) < 0) {
+		ret = -1;
+		printk(BIOS_ERR, "%s: Failed to transfer %zu bytes\n",
+				__func__, sizeof(spi_read_cmd));
+		goto tegra_spi_cbfs_read_exit;
+	}
+
+	if (channel->dual_mode) {
+		setbits_le32(&channel->regs->command1, SPI_CMD1_BOTH_EN_BIT);
+	}
+	if (spi_xfer(spi->slave, NULL, 0, dest, count)) {
+		ret = -1;
+		printk(BIOS_ERR, "%s: Failed to transfer %zu bytes\n",
+				__func__, count);
+	}
+	if (channel->dual_mode)
+		clrbits_le32(&channel->regs->command1, SPI_CMD1_BOTH_EN_BIT);
+
+tegra_spi_cbfs_read_exit:
+	/* de-assert /CS */
+	spi_release_bus(spi->slave);
+	return (ret < 0) ? 0 : ret;
+}
+
+static void *tegra_spi_cbfs_map(struct cbfs_media *media, size_t offset,
+				 size_t count)
+{
+	struct tegra_spi_media *spi = (struct tegra_spi_media*)media->context;
+	void *map;
+	DEBUG_SPI("tegra_spi_cbfs_map\n");
+	map = cbfs_simple_buffer_map(&spi->buffer, media, offset, count);
+	return map;
+}
+
+static void *tegra_spi_cbfs_unmap(struct cbfs_media *media,
+				   const void *address)
+{
+	struct tegra_spi_media *spi = (struct tegra_spi_media*)media->context;
+	DEBUG_SPI("tegra_spi_cbfs_unmap\n");
+	return cbfs_simple_buffer_unmap(&spi->buffer, address);
+}
+
+int initialize_tegra_spi_cbfs_media(struct cbfs_media *media,
+				     void *buffer_address,
+				     size_t buffer_size)
+{
+	// TODO Replace static variable to support multiple streams.
+	static struct tegra_spi_media context;
+	static struct tegra_spi_channel *channel;
+
+	channel = &tegra_spi_channels[CONFIG_BOOT_MEDIA_SPI_BUS - 1];
+	channel->slave.cs = CONFIG_BOOT_MEDIA_SPI_CHIP_SELECT;
+
+	DEBUG_SPI("Initializing CBFS media on SPI\n");
+
+	context.slave = &channel->slave;
+	context.buffer.allocated = context.buffer.last_allocate = 0;
+	context.buffer.buffer = buffer_address;
+	context.buffer.size = buffer_size;
+	media->context = (void*)&context;
+	media->open = tegra_spi_cbfs_open;
+	media->close = tegra_spi_cbfs_close;
+	media->read = tegra_spi_cbfs_read;
+	media->map = tegra_spi_cbfs_map;
+	media->unmap = tegra_spi_cbfs_unmap;
+
+#if CONFIG_SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B == 1
+	channel->dual_mode = 1;
+#endif
+
+	return 0;
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+{
+	struct tegra_spi_channel *channel = to_tegra_spi(bus);
+	if (!channel)
+		return NULL;
+
+	return &channel->slave;
+}
diff --git a/src/soc/nvidia/tegra132/spi.h b/src/soc/nvidia/tegra132/spi.h
new file mode 100644
index 0000000000..e53505925b
--- /dev/null
+++ b/src/soc/nvidia/tegra132/spi.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2014 Google Inc.
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVIDIA_TEGRA132_SPI_H__
+#define __NVIDIA_TEGRA132_SPI_H__
+
+#include <spi-generic.h>
+#include <stddef.h>
+
+#include "dma.h"
+
+struct tegra_spi_regs {
+	u32 command1;		/* 0x000: SPI_COMMAND1 */
+	u32 command2;		/* 0x004: SPI_COMMAND2 */
+	u32 timing1;		/* 0x008: SPI_CS_TIM1 */
+	u32 timing2;		/* 0x00c: SPI_CS_TIM2 */
+	u32 trans_status;	/* 0x010: SPI_TRANS_STATUS */
+	u32 fifo_status;	/* 0x014: SPI_FIFO_STATUS */
+	u32 tx_data;		/* 0x018: SPI_TX_DATA */
+	u32 rx_data;		/* 0x01c: SPI_RX_DATA */
+	u32 dma_ctl;		/* 0x020: SPI_DMA_CTL */
+	u32 dma_blk;		/* 0x024: SPI_DMA_BLK */
+	u32 rsvd[56];		/* 0x028-0x107: reserved */
+	u32 tx_fifo;		/* 0x108: SPI_FIFO1 */
+	u32 rsvd2[31];		/* 0x10c-0x187 reserved */
+	u32 rx_fifo;		/* 0x188: SPI_FIFO2 */
+	u32 spare_ctl;		/* 0x18c: SPI_SPARE_CTRL */
+} __attribute__((packed));
+check_member(tegra_spi_regs, spare_ctl, 0x18c);
+
+enum spi_xfer_mode {
+	XFER_MODE_NONE = 0,
+	XFER_MODE_PIO,
+	XFER_MODE_DMA,
+};
+
+struct tegra_spi_channel {
+	struct tegra_spi_regs *regs;
+
+	/* static configuration */
+	struct spi_slave slave;
+	unsigned int req_sel;
+
+	int dual_mode;		/* for x2 transfers with bit interleaving */
+
+	/* context (used internally) */
+	u8 *in_buf, *out_buf;
+	struct apb_dma_channel *dma_out, *dma_in;
+	enum spi_xfer_mode xfer_mode;
+};
+
+struct cbfs_media;
+int initialize_tegra_spi_cbfs_media(struct cbfs_media *media,
+				     void *buffer_address,
+				     size_t buffer_size);
+
+struct tegra_spi_channel *tegra_spi_init(unsigned int bus);
+
+#endif	/* __NVIDIA_TEGRA132_SPI_H__ */