Add support for the on-chip XHCI host controller present on NVIDIA
Tegra114 and later SoCs.
The driver is currently very basic: it loads the controller with its
firmware, starts the controller, and is able to service messages sent
by the controller's firmware. The hardware supports device mode as
well as runtime power-gating, but support for these is not yet
implemented here.
Based on work by:
Ajay Gupta <ajayg@xxxxxxxxxx>
Bharath Yadav <byadav@xxxxxxxxxx>
Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
---
.../devicetree/bindings/usb/nvidia,tegra-xhci.txt | 42 ++
drivers/usb/host/Kconfig | 12 +
drivers/usb/host/Makefile | 2 +
drivers/usb/host/xhci-tegra.c | 796 +++++++++++++++++++++
drivers/usb/host/xhci-tegra.h | 131 ++++
include/linux/usb/tegra_xusb.h | 66 ++
6 files changed, 1049 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/nvidia,tegra-xhci.txt
create mode 100644 drivers/usb/host/xhci-tegra.c
create mode 100644 drivers/usb/host/xhci-tegra.h
create mode 100644 include/linux/usb/tegra_xusb.h
diff --git a/Documentation/devicetree/bindings/usb/nvidia,tegra-xhci.txt b/Documentation/devicetree/bindings/usb/nvidia,tegra-xhci.txt
new file mode 100644
index 0000000..6d94bd6
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/nvidia,tegra-xhci.txt
@@ -0,0 +1,42 @@
+NVIDIA Tegra XHCI controller
+
+The device node for the Tegra XHCI host controller present on Tegra114 and
+later SoCs.
+
+Required properties:
+ - compatible: Should be "nvidia,tegra114-xhci" or "nvidia,tegra124-xhci".
+ - reg: Address and length of the register sets. There should be three
+ entries in the following order: XHCI host registers, FPCI registers, and
+ IPFS registers.
+ - interrupts: Interrupts used by the controller. There should be two
+ entries in the following order: XHCI host interrupt and firmware mailbox
+ interrupt.
+ - clocks: Handles to XUSB host and falcon clocks.
+ - clock-names: Should be "xusb_host" and "xusb_falcon_src", respecitively.
+ - resets: Handle to XUSB host reset.
+ - reset-names: Should be "xusb_host".
+ - phys: Handle to the XUSB PHY.
+ - phy-names: Should be "xusb".
+ - s1p05v-supply: 1.05V supply regulator.
+ - s1p8v-supply: 1.8V supply regulator.
+ - s3p3v-supply: 3.3V supply regulator.
+
+Example:
+ usb@0,70090000 {
+ compatible = "nvidia,tegra114-xhci", "nvidia,tegra124-xhci";
+ reg = <0x0 0x70090000 0x0 0x8000>,
+ <0x0 0x70098000 0x0 0x1000>,
+ <0x0 0x70099000 0x0 0x1000>;
+ interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&tegra_car TEGRA124_CLK_XUSB_HOST>,
+ <&tegra_car TEGRA124_CLK_XUSB_FALCON_SRC>;
+ clock-names = "xusb_host", "xusb_falcon_src";
+ resets = <&tegra_car 89>;
+ reset-names = "xusb_host";
+ phy = <&xusb_phy>;
+ phy-names = "xusb";
+ s1p05v-supply = <&vdd_1v05_run>;
+ s3p3v-supply = <&vdd_3v3_lp0>;
+ s1p8v-supply = <&vddio_1v8>;
+ };
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 3d9e540..43f7977 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -29,6 +29,18 @@ if USB_XHCI_HCD
config USB_XHCI_PLATFORM
tristate
+config USB_XHCI_TEGRA
+ tristate "Support for NVIDIA Tegra XHCI host controller"
+ depends on ARCH_TEGRA
+ select USB_XHCI_PLATFORM
+ select PHY_TEGRA_XUSB
+ select FW_LOADER
+ ---help---
+ Enables support for the on-chip XHCI controller present on NVIDIA
+ Tegra114 and later SoCs.
+
+ If unsure, say N.
+
endif # USB_XHCI_HCD
config USB_EHCI_HCD
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 7530468..5941d36 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -38,6 +38,8 @@ obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
obj-$(CONFIG_USB_W90X900_EHCI) += ehci-w90x900.o
+obj-$(CONFIG_USB_XHCI_TEGRA) += xhci-tegra.o
+
obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
obj-$(CONFIG_USB_ISP1362_HCD) += isp1362-hcd.o
diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
new file mode 100644
index 0000000..5c705b7
--- /dev/null
+++ b/drivers/usb/host/xhci-tegra.c
@@ -0,0 +1,796 @@
+/*
+ * NVIDIA Tegra XHCI host controller driver
+ *
+ * Copyright (C) 2014 NVIDIA Corporation
+ * 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/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/firmware.h>
+#include <linux/interrupt.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/usb/tegra_xusb.h>
+
+#include "xhci-tegra.h"
+
+struct tegra_xhci_fw_cfgtbl {
+ u32 boot_loadaddr_in_imem;
+ u32 boot_codedfi_offset;
+ u32 boot_codetag;
+ u32 boot_codesize;
+ u32 phys_memaddr;
+ u16 reqphys_memsize;
+ u16 alloc_phys_memsize;
+ u32 rodata_img_offset;
+ u32 rodata_section_start;
+ u32 rodata_section_end;
+ u32 main_fnaddr;
+ u32 fwimg_cksum;
+ u32 fwimg_created_time;
+ u32 imem_resident_start;
+ u32 imem_resident_end;
+ u32 idirect_start;
+ u32 idirect_end;
+ u32 l2_imem_start;
+ u32 l2_imem_end;
+ u32 version_id;
+ u8 init_ddirect;
+ u8 reserved[3];
+ u32 phys_addr_log_buffer;
+ u32 total_log_entries;
+ u32 dequeue_ptr;
+ u32 dummy_var[2];
+ u32 fwimg_len;
+ u8 magic[8];
+ u32 ss_low_power_entry_timeout;
+ u8 num_hsic_port;
+ u8 padding[139]; /* Padding bytes to make 256-bytes cfgtbl */
+};
+
+struct tegra_xhci_soc_config {
+ const char *firmware_file;
+};
+
+struct tegra_xhci_hcd {
+ struct device *dev;
+ struct platform_device *xhci_pdev;
+
+ int mbox_irq;
+ struct notifier_block mbox_nb;
+
+ phys_addr_t host_phys_base;
+ void __iomem *fpci_base;
+ void __iomem *ipfs_base;
+
+ const struct tegra_xhci_soc_config *soc_config;
+
+ struct regulator *xusb_s1p05v_reg;
+ struct regulator *xusb_s3p3v_reg;
+ struct regulator *xusb_s1p8v_reg;
+
+ /* XUSB host clock */
+ struct clk *host_clk;
+ /* XUSB Falcon controller clock */
+ struct clk *falc_clk;
+ /* XUSB host reset */
+ struct reset_control *host_rst;
+
+ /* XUSB PHY */
+ struct phy *phy;
+
+ /* Firmware loading related */
+ void *fw_data;
+ size_t fw_size;
+ dma_addr_t fw_dma_addr;
+};
+
+static RAW_NOTIFIER_HEAD(tegra_xhci_mbox_notifiers);
+static DEFINE_MUTEX(tegra_xhci_mbox_lock);
+
+int tegra_xhci_register_mbox_notifier(struct notifier_block *nb)
+{
+ int ret;
+
+ mutex_lock(&tegra_xhci_mbox_lock);
+ ret = raw_notifier_chain_register(&tegra_xhci_mbox_notifiers, nb);
+ mutex_unlock(&tegra_xhci_mbox_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(tegra_xhci_register_mbox_notifier);
+
+void tegra_xhci_unregister_mbox_notifier(struct notifier_block *nb)
+{
+ mutex_lock(&tegra_xhci_mbox_lock);
+ raw_notifier_chain_unregister(&tegra_xhci_mbox_notifiers, nb);
+ mutex_unlock(&tegra_xhci_mbox_lock);
+}
+EXPORT_SYMBOL(tegra_xhci_unregister_mbox_notifier);
+
+static inline u32 fpci_readl(struct tegra_xhci_hcd *tegra, u32 addr)
+{
+ return readl(tegra->fpci_base + addr);
+}
+
+static inline void fpci_writel(struct tegra_xhci_hcd *tegra, u32 val, u32 addr)
+{
+ writel(val, tegra->fpci_base + addr);
+}
+
+static inline u32 ipfs_readl(struct tegra_xhci_hcd *tegra, u32 addr)
+{
+ return readl(tegra->ipfs_base + addr);
+}
+
+static inline void ipfs_writel(struct tegra_xhci_hcd *tegra, u32 val, u32 addr)
+{
+ writel(val, tegra->ipfs_base + addr);
+}
+
+static u32 csb_readl(struct tegra_xhci_hcd *tegra, u32 addr)
+{
+ u32 page, offset;
+
+ page = CSB_PAGE_SELECT(addr);
+ offset = CSB_PAGE_OFFSET(addr);
+ fpci_writel(tegra, page, XUSB_CFG_ARU_C11_CSBRANGE);
+ return fpci_readl(tegra, XUSB_CFG_CSB_BASE_ADDR + offset);
+}
+
+static void csb_writel(struct tegra_xhci_hcd *tegra, u32 val, u32 addr)
+{
+ u32 page, offset;
+
+ page = CSB_PAGE_SELECT(addr);
+ offset = CSB_PAGE_OFFSET(addr);
+ fpci_writel(tegra, page, XUSB_CFG_ARU_C11_CSBRANGE);
+ fpci_writel(tegra, val, XUSB_CFG_CSB_BASE_ADDR + offset);
+}
+
+static void tegra_xhci_cfg(struct tegra_xhci_hcd *tegra)
+{
+ u32 reg;
+
+ reg = ipfs_readl(tegra, IPFS_XUSB_HOST_CONFIGURATION_0);
+ reg |= IPFS_EN_FPCI;
+ ipfs_writel(tegra, reg, IPFS_XUSB_HOST_CONFIGURATION_0);
+ udelay(10);
+
+ /* Program Bar0 Space */
+ reg = fpci_readl(tegra, XUSB_CFG_4);
+ reg |= tegra->host_phys_base;
+ fpci_writel(tegra, reg, XUSB_CFG_4);
+ usleep_range(100, 200);
+
+ /* Enable Bus Master */
+ reg = fpci_readl(tegra, XUSB_CFG_1);
+ reg |= XUSB_IO_SPACE_EN | XUSB_MEM_SPACE_EN | XUSB_BUS_MASTER_EN;
+ fpci_writel(tegra, reg, XUSB_CFG_1);
+
+ /* Set intr mask to enable intr assertion */
+ reg = ipfs_readl(tegra, IPFS_XUSB_HOST_INTR_MASK_0);
+ reg |= IPFS_IP_INT_MASK;
+ ipfs_writel(tegra, reg, IPFS_XUSB_HOST_INTR_MASK_0);
+
+ /* Set hysteris to 0x80 */
+ ipfs_writel(tegra, 0x80, IPFS_XUSB_HOST_CLKGATE_HYSTERESIS_0);
+}
+
+static int tegra_xhci_mbox_send(struct tegra_xhci_hcd *tegra,
+ enum tegra_xusb_mbox_cmd type, u32 data)
+{
+ struct device *dev = tegra->dev;
+ unsigned long timeout;
+ u32 reg;
+
+ dev_dbg(dev, "MBOX send message 0x%x:0x%x\n", type, data);
+ mutex_lock(&tegra_xhci_mbox_lock);
+
+ timeout = jiffies + msecs_to_jiffies(20);
+ /* Wait for mailbox to become idle */
+ while ((fpci_readl(tegra, XUSB_CFG_ARU_MBOX_OWNER) != MBOX_OWNER_NONE)
+ && time_is_after_jiffies(timeout)) {
+ mutex_unlock(&tegra_xhci_mbox_lock);
+ usleep_range(100, 200);
+ mutex_lock(&tegra_xhci_mbox_lock);
+ }
+ if (fpci_readl(tegra, XUSB_CFG_ARU_MBOX_OWNER) != MBOX_OWNER_NONE) {
+ dev_err(dev, "Mailbox failed to go idle\n");
+ goto timeout;
+ }
+
+ timeout = jiffies + msecs_to_jiffies(10);
+ /* Acquire mailbox */
+ fpci_writel(tegra, MBOX_OWNER_SW, XUSB_CFG_ARU_MBOX_OWNER);
+ while ((fpci_readl(tegra, XUSB_CFG_ARU_MBOX_OWNER) != MBOX_OWNER_SW) &&
+ time_is_after_jiffies(timeout)) {
+ mutex_unlock(&tegra_xhci_mbox_lock);
+ usleep_range(100, 200);
+ mutex_lock(&tegra_xhci_mbox_lock);
+ fpci_writel(tegra, MBOX_OWNER_SW, XUSB_CFG_ARU_MBOX_OWNER);
+ }
+ if (fpci_readl(tegra, XUSB_CFG_ARU_MBOX_OWNER) != MBOX_OWNER_SW) {
+ dev_err(dev, "Acquire mailbox timeout\n");
+ goto timeout;
+ }
+
+ reg = (type & CMD_TYPE_MASK) << CMD_TYPE_SHIFT;
+ reg |= (data & CMD_DATA_MASK) << CMD_DATA_SHIFT;
+ fpci_writel(tegra, reg, XUSB_CFG_ARU_MBOX_DATA_IN);
+
+ reg = fpci_readl(tegra, XUSB_CFG_ARU_MBOX_CMD);
+ reg |= MBOX_INT_EN | MBOX_FALC_INT_EN;
+ fpci_writel(tegra, reg, XUSB_CFG_ARU_MBOX_CMD);
+
+ mutex_unlock(&tegra_xhci_mbox_lock);
+
+ return 0;
+timeout:
+ mutex_unlock(&tegra_xhci_mbox_lock);
+ return -ETIMEDOUT;
+}
+
+static irqreturn_t tegra_xhci_mbox_irq(int irq, void *p)
+{
+ struct tegra_xhci_hcd *tegra = (struct tegra_xhci_hcd *)p;
+ struct device *dev = tegra->dev;
+ u32 resp = 0, cmd_type, cmd_data, reg;
+
+ mutex_lock(&tegra_xhci_mbox_lock);
+
+ /* Clear mbox interrupts */
+ reg = fpci_readl(tegra, XUSB_CFG_ARU_SMI_INTR);
+ if (reg & MBOX_SMI_INTR_FW_HANG)
+ dev_err(dev, "Hang up inside firmware\n");
+ fpci_writel(tegra, reg, XUSB_CFG_ARU_SMI_INTR);
+
+ /* Get the mbox message from firmware */
+ reg = fpci_readl(tegra, XUSB_CFG_ARU_MBOX_DATA_OUT);
+ cmd_type = (reg >> CMD_TYPE_SHIFT) & CMD_TYPE_MASK;
+ cmd_data = (reg >> CMD_DATA_SHIFT) & CMD_DATA_MASK;
+
+ /* Decode the message and call the notifiers */
+ dev_dbg(dev, "MBOX receive message 0x%x:0x%x\n", cmd_type, cmd_data);
+ if (cmd_type < MBOX_CMD_MAX) {
+ struct mbox_notifier_data mbox_info;
+
+ mbox_info.msg_data = cmd_data;
+ mbox_info.resp_cmd = 0;
+ mbox_info.resp_data = 0;
+ raw_notifier_call_chain(&tegra_xhci_mbox_notifiers, cmd_type,
+ &mbox_info);
+ if (mbox_info.resp_cmd) {
+ resp = (mbox_info.resp_cmd & CMD_TYPE_MASK) <<
+ CMD_TYPE_SHIFT;
+ resp |= (mbox_info.resp_data & CMD_DATA_MASK) <<
+ CMD_DATA_SHIFT;
+ }
+ } else if (cmd_type == MBOX_CMD_ACK) {
+ dev_dbg(dev, "Firmware responds with ACK\n");
+ } else if (cmd_type == MBOX_CMD_NAK) {
+ dev_err(dev, "Firmware responds with NAK\n");
+ } else {
+ dev_err(dev, "Invalid command %x\n", cmd_type);
+ }
+
+ if (resp) {
+ /* Send ACK/NAK to firmware */
+ fpci_writel(tegra, resp, XUSB_CFG_ARU_MBOX_DATA_IN);
+ reg = fpci_readl(tegra, XUSB_CFG_ARU_MBOX_CMD);
+ reg |= MBOX_INT_EN | MBOX_FALC_INT_EN;
+ fpci_writel(tegra, reg, XUSB_CFG_ARU_MBOX_CMD);
+ } else {
+ /* Clear MBOX_SMI_INT_EN bit */
+ reg = fpci_readl(tegra, XUSB_CFG_ARU_MBOX_CMD);
+ reg &= ~MBOX_SMI_INT_EN;
+ fpci_writel(tegra, reg, XUSB_CFG_ARU_MBOX_CMD);
+ /* Clear mailbox ownership */
+ fpci_writel(tegra, MBOX_OWNER_NONE, XUSB_CFG_ARU_MBOX_OWNER);
+ }
+
+ mutex_unlock(&tegra_xhci_mbox_lock);
+
+ return IRQ_HANDLED;
+}
+
+static int tegra_xhci_default_mbox_notifier(struct notifier_block *nb,
+ unsigned long event, void *p)
+{
+ struct tegra_xhci_hcd *tegra = container_of(nb, struct tegra_xhci_hcd,
+ mbox_nb);
+ struct mbox_notifier_data *data = (struct mbox_notifier_data *)p;
+
+ switch (event) {
+ case MBOX_CMD_INC_FALC_CLOCK:
+ case MBOX_CMD_DEC_FALC_CLOCK:
+ data->resp_data = clk_get_rate(tegra->falc_clk) / 1000;
+ if (data->resp_data != data->msg_data)
+ data->resp_cmd = MBOX_CMD_NAK;
+ else
+ data->resp_cmd = MBOX_CMD_ACK;
+ return NOTIFY_STOP;
+ case MBOX_CMD_SET_BW:
+ /* No support for EMC scaling yet */
+ return NOTIFY_STOP;
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
+static int tegra_xhci_load_firmware(struct tegra_xhci_hcd *tegra)
+{
+ struct device *dev = tegra->dev;
+ struct tegra_xhci_fw_cfgtbl *cfg_tbl;
+ u64 fw_base;
+ u32 val;
+ time_t fw_time;
+ struct tm fw_tm;
+
+ if (csb_readl(tegra, XUSB_CSB_MP_ILOAD_BASE_LO) != 0) {
+ dev_info(dev, "Firmware already loaded, Falcon state 0x%x\n",
+ csb_readl(tegra, XUSB_FALC_CPUCTL));
+ return 0;
+ }
+
+ cfg_tbl = (struct tegra_xhci_fw_cfgtbl *)tegra->fw_data;
+
+ /* Program the size of DFI into ILOAD_ATTR */
+ csb_writel(tegra, tegra->fw_size, XUSB_CSB_MP_ILOAD_ATTR);
+
+ /*
+ * Boot code of the firmware reads the ILOAD_BASE registers
+ * to get to the start of the DFI in system memory.
+ */
+ fw_base = tegra->fw_dma_addr + sizeof(*cfg_tbl);
+ csb_writel(tegra, fw_base, XUSB_CSB_MP_ILOAD_BASE_LO);
+ csb_writel(tegra, fw_base >> 32, XUSB_CSB_MP_ILOAD_BASE_HI);
+
+ /* Set BOOTPATH to 1 in APMAP. */
+ csb_writel(tegra, APMAP_BOOTPATH, XUSB_CSB_MP_APMAP);
+
+ /* Invalidate L2IMEM. */
+ csb_writel(tegra, L2IMEMOP_INVALIDATE_ALL, XUSB_CSB_MP_L2IMEMOP_TRIG);
+
+ /*
+ * Initiate fetch of bootcode from system memory into L2IMEM.
+ * Program bootcode location and size in system memory.
+ */
+ val = (DIV_ROUND_UP(cfg_tbl->boot_codetag, IMEM_BLOCK_SIZE) &
+ L2IMEMOP_SIZE_SRC_OFFSET_MASK) << L2IMEMOP_SIZE_SRC_OFFSET_SHIFT;
+ val |= (DIV_ROUND_UP(cfg_tbl->boot_codesize, IMEM_BLOCK_SIZE) &
+ L2IMEMOP_SIZE_SRC_COUNT_MASK) << L2IMEMOP_SIZE_SRC_COUNT_SHIFT;
+ csb_writel(tegra, val, XUSB_CSB_MP_L2IMEMOP_SIZE);
+
+ /* Trigger L2IMEM Load operation. */
+ csb_writel(tegra, L2IMEMOP_LOAD_LOCKED_RESULT,
+ XUSB_CSB_MP_L2IMEMOP_TRIG);
+
+ /* Setup Falcon Auto-fill */
+ val = DIV_ROUND_UP(cfg_tbl->boot_codesize, IMEM_BLOCK_SIZE);
+ csb_writel(tegra, val, XUSB_FALC_IMFILLCTL);
+
+ val = DIV_ROUND_UP(cfg_tbl->boot_codetag, IMEM_BLOCK_SIZE) &
+ IMFILLRNG1_TAG_MASK;
+ val |= DIV_ROUND_UP(cfg_tbl->boot_codetag + cfg_tbl->boot_codesize,
+ IMEM_BLOCK_SIZE) << IMFILLRNG1_TAG_HI_SHIFT;
+ csb_writel(tegra, val, XUSB_FALC_IMFILLRNG1);
+
+ csb_writel(tegra, 0, XUSB_FALC_DMACTL);
+ msleep(50);
+
+ csb_writel(tegra, cfg_tbl->boot_codetag, XUSB_FALC_BOOTVEC);
+
+ /* Start Falcon CPU */
+ csb_writel(tegra, CPUCTL_STARTCPU, XUSB_FALC_CPUCTL);
+ usleep_range(1000, 2000);
+
+ fw_time = cfg_tbl->fwimg_created_time;
+ time_to_tm(fw_time, 0, &fw_tm);
+ dev_info(dev,
+ "Firmware timestamp: %ld-%02d-%02d %02d:%02d:%02d UTC, "
+ "Falcon state 0x%x\n", fw_tm.tm_year + 1900,
+ fw_tm.tm_mon + 1, fw_tm.tm_mday, fw_tm.tm_hour,
+ fw_tm.tm_min, fw_tm.tm_sec,
+ csb_readl(tegra, XUSB_FALC_CPUCTL));
+
+ /* Bail out if Falcon CPU is not in a good state */
+ if (csb_readl(tegra, XUSB_FALC_CPUCTL) == CPUCTL_STATE_HALTED)
+ return -EIO;
+
+ return 0;
+}
+
+static int tegra_xhci_regulator_init(struct tegra_xhci_hcd *tegra)
+{
+ struct device *dev = tegra->dev;
+ int err = 0;
+
+ tegra->xusb_s3p3v_reg = devm_regulator_get(dev, "s3p3v");
+ if (IS_ERR(tegra->xusb_s3p3v_reg)) {
+ dev_err(dev, "s3p3v regulator not found: %ld.",
+ PTR_ERR(tegra->xusb_s3p3v_reg));
+ return PTR_ERR(tegra->xusb_s3p3v_reg);
+ }
+ err = regulator_enable(tegra->xusb_s3p3v_reg);
+ if (err < 0) {
+ dev_err(dev, "s3p3v regulator enable failed:%d\n", err);
+ return err;
+ }
+
+ tegra->xusb_s1p8v_reg = devm_regulator_get(dev, "s1p8v");
+ if (IS_ERR(tegra->xusb_s1p8v_reg)) {
+ dev_err(dev, "s1p8v regulator not found: %ld.",
+ PTR_ERR(tegra->xusb_s1p8v_reg));
+ err = PTR_ERR(tegra->xusb_s1p8v_reg);
+ goto err_put_s3p3v_reg;
+ } else {
+ err = regulator_enable(tegra->xusb_s1p8v_reg);
+ if (err < 0) {
+ dev_err(dev, "s1p8v regulator enable failed:%d\n", err);
+ goto err_put_s3p3v_reg;
+ }
+ }
+
+ tegra->xusb_s1p05v_reg = devm_regulator_get(dev, "s1p05v");
+ if (IS_ERR(tegra->xusb_s1p05v_reg)) {
+ dev_err(dev, "s1p05v regulator not found: %ld.",
+ PTR_ERR(tegra->xusb_s1p05v_reg));
+ err = PTR_ERR(tegra->xusb_s1p05v_reg);
+ goto err_put_s1p8v_reg;
+ } else {
+ err = regulator_enable(tegra->xusb_s1p05v_reg);
+ if (err < 0) {
+ dev_err(dev,
+ "s1p05v regulator enable failed:%d\n", err);
+ goto err_put_s1p8v_reg;
+ }
+ }
+
+ return 0;
+
+err_put_s1p8v_reg:
+ regulator_disable(tegra->xusb_s1p8v_reg);
+err_put_s3p3v_reg:
+ regulator_disable(tegra->xusb_s3p3v_reg);
+ return err;
+}
+
+static void tegra_xhci_regulator_deinit(struct tegra_xhci_hcd *tegra)
+{
+ regulator_disable(tegra->xusb_s1p05v_reg);
+ regulator_disable(tegra->xusb_s1p8v_reg);
+ regulator_disable(tegra->xusb_s3p3v_reg);
+}
+
+static int tegra_xhci_clk_init(struct tegra_xhci_hcd *tegra)
+{
+ struct device *dev = tegra->dev;
+ int err = 0;
+
+ tegra->host_clk = devm_clk_get(dev, "xusb_host");
+ if (IS_ERR(tegra->host_clk)) {
+ dev_err(dev, "Failed to get xusb_host clk\n");
+ err = PTR_ERR(tegra->host_clk);
+ return err;
+ }
+
+ tegra->falc_clk = devm_clk_get(dev, "xusb_falcon_src");
+ if (IS_ERR(tegra->falc_clk)) {
+ dev_err(dev, "Failed to get xusb_falcon_src clk\n");
+ err = PTR_ERR(tegra->falc_clk);
+ return err;
+ }
+
+ clk_prepare_enable(tegra->host_clk);
+ clk_prepare_enable(tegra->falc_clk);
+
+ return 0;
+}
+
+static void tegra_xhci_clk_deinit(struct tegra_xhci_hcd *tegra)
+{
+ clk_disable_unprepare(tegra->host_clk);
+ clk_disable_unprepare(tegra->falc_clk);
+}
+
+static const struct tegra_xhci_soc_config tegra114_soc_config = {
+ .firmware_file = "tegra11x/tegra_xusb_firmware",
+};
+
+static const struct tegra_xhci_soc_config tegra124_soc_config = {
+ .firmware_file = "tegra12x/tegra_xusb_firmware",
+};
+
+static struct of_device_id tegra_xhci_of_match[] = {
+ { .compatible = "nvidia,tegra114-xhci", .data = &tegra114_soc_config },
+ { .compatible = "nvidia,tegra124-xhci", .data = &tegra124_soc_config },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_xhci_of_match);
+
+static void tegra_xhci_probe_finish(const struct firmware *fw, void *context)
+{
+ struct tegra_xhci_hcd *tegra = context;
+ struct device *dev = tegra->dev;
+ struct platform_device *xhci = NULL;
+ struct resource xhci_resources[2];
+ struct resource *res;
+ struct tegra_xhci_fw_cfgtbl *cfg_tbl;
+ int ret;
+
+ if (!fw) {
+ dev_err(dev, "Failed to load firmware file\n");
+ ret = -ENOENT;
+ goto out;
+ }
+
+ /* Load Falcon controller with its firmware */
+ cfg_tbl = (struct tegra_xhci_fw_cfgtbl *)fw->data;
+ tegra->fw_size = cfg_tbl->fwimg_len;
+ tegra->fw_data = dma_alloc_coherent(dev, tegra->fw_size,
+ &tegra->fw_dma_addr,
+ GFP_KERNEL);
+ if (!tegra->fw_data) {
+ dev_err(dev, "Failed to allocate DMA buffer for firmware\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+ memcpy(tegra->fw_data, fw->data, tegra->fw_size);
+
+ ret = tegra_xhci_load_firmware(tegra);
+ if (ret < 0) {
+ dev_err(dev, "Failed to load controller firmware\n");
+ goto out;
+ }
+
+ /* Set up mailbox notifier and interrupt handler */
+ tegra->mbox_nb.notifier_call = tegra_xhci_default_mbox_notifier;
+ ret = tegra_xhci_register_mbox_notifier(&tegra->mbox_nb);
+ if (ret < 0) {
+ dev_err(dev, "Failed to registe mbox handler\n");
+ goto out;
+ }
+ tegra->mbox_irq = platform_get_irq(to_platform_device(dev), 1);
+ if (!tegra->mbox_irq) {
+ dev_err(dev, "Missing MBOX IRQ\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ ret = devm_request_threaded_irq(dev, tegra->mbox_irq, NULL,
+ tegra_xhci_mbox_irq, IRQF_ONESHOT,
+ "tegra_xhci_mbox_irq", tegra);
+ if (ret != 0) {
+ dev_err(dev, "Failed to request MBOX IRQ\n");
+ goto out;
+ }
+
+ /* Create child xhci-plat device */
+ memset(xhci_resources, 0, sizeof(xhci_resources));
+ res = platform_get_resource(to_platform_device(dev), IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(dev, "Missing XHCI IRQ\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ xhci_resources[0].start = res->start;
+ xhci_resources[0].end = res->end;
+ xhci_resources[0].flags = res->flags;
+ xhci_resources[0].name = res->name;
+ res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "Missing XHCI registers\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ xhci_resources[1].start = res->start;
+ xhci_resources[1].end = res->end;
+ xhci_resources[1].flags = res->flags;
+ xhci_resources[1].name = res->name;
+
+ xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
+ if (!xhci) {
+ dev_err(dev, "Failed to allocate XHCI host\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+ xhci->dev.parent = dev;
+ ret = dma_coerce_mask_and_coherent(&xhci->dev,
+ dev->coherent_dma_mask);
+ if (ret) {
+ dev_err(dev, "Failed to set XHCI dma mask\n");
+ goto out;
+ }
+ ret = platform_device_add_resources(xhci, xhci_resources,
+ ARRAY_SIZE(xhci_resources));
+ if (ret) {
+ dev_err(dev, "Failed to add XHCI resources\n");
+ goto out;
+ }
+ ret = platform_device_add(xhci);
+ if (ret) {
+ dev_err(dev, "failed to register XHCI device\n");
+ goto out;
+ }
+ tegra->xhci_pdev = xhci;
+
+ /* Enable firmware messages from controller */
+ tegra_xhci_mbox_send(tegra, MBOX_CMD_MSG_ENABLED, 0);
+
+out:
+ release_firmware(fw);
+ if (ret)
+ platform_device_put(xhci);
+}
+
+static int tegra_xhci_probe(struct platform_device *pdev)
+{
+ struct tegra_xhci_hcd *tegra;
+ struct resource *res;
+ const struct of_device_id *match;
+ int ret;
+
+ BUILD_BUG_ON(sizeof(struct tegra_xhci_fw_cfgtbl) != 256);
+
+ tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
+ if (!tegra) {
+ dev_err(&pdev->dev, "memory alloc failed\n");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pdev, tegra);
+ tegra->dev = &pdev->dev;
+
+ match = of_match_device(tegra_xhci_of_match, &pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "No device match found\n");
+ return -ENODEV;
+ }
+ tegra->soc_config = match->data;
+
+ /*
+ * Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we have dma capability bindings this can go away.
+ */
+ ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (ret)
+ return ret;
+
+ /*
+ * The firmware needs the XHCI host's base physical address.
+ * Get it here and save it for later.
+ */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Missing XHCI registers\n");
+ return -ENODEV;
+ }
+ tegra->host_phys_base = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ tegra->fpci_base = devm_ioremap_resource(&pdev->dev, res);
+ if (!tegra->fpci_base) {
+ dev_err(&pdev->dev, "Failed to map FPCI registers\n");
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ tegra->ipfs_base = devm_ioremap_resource(&pdev->dev, res);
+ if (!tegra->ipfs_base) {
+ dev_err(&pdev->dev, "Failed to map IPFS registers\n");
+ return -ENOMEM;
+ }
+
+ tegra->phy = devm_phy_get(&pdev->dev, "xusb");
+ if (IS_ERR(tegra->phy)) {
+ dev_err(&pdev->dev, "Failed to get PHY\n");
+ return PTR_ERR(tegra->phy);
+ }
+ ret = phy_init(tegra->phy);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "PHY initialization failed\n");
+ return ret;
+ }
+
+ tegra->host_rst = devm_reset_control_get(&pdev->dev, "xusb_host");
+ if (IS_ERR(tegra->host_rst)) {
+ dev_err(&pdev->dev, "Failed to get host reset\n");
+ ret = PTR_ERR(tegra->host_rst);
+ goto err_deinit_phy;
+ }
+
+ ret = tegra_xhci_clk_init(tegra);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to initialize XHCI clocks\n");
+ goto err_deinit_phy;
+ }
+
+ ret = tegra_xhci_regulator_init(tegra);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to initialize XHCI regulators\n");
+ goto err_deinit_clk;
+ }
+
+ /* Setup IPFS access and BAR0 space */
+ tegra_xhci_cfg(tegra);
+
+ ret = phy_power_on(tegra->phy);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "PHY power up failed\n");
+ goto err_deinit_regulator;
+ }
+
+ ret = request_firmware_nowait(THIS_MODULE, true,
+ tegra->soc_config->firmware_file,
+ tegra->dev, GFP_KERNEL, tegra,
+ tegra_xhci_probe_finish);
+ if (ret < 0) {
+ dev_err(tegra->dev, "Failed to request firmware\n");
+ goto err_shutdown_phy;
+ }
+
+ return 0;
+
+err_shutdown_phy:
+ phy_power_off(tegra->phy);
+err_deinit_regulator:
+ tegra_xhci_regulator_deinit(tegra);
+err_deinit_clk:
+ tegra_xhci_clk_deinit(tegra);
+err_deinit_phy:
+ phy_exit(tegra->phy);
+
+ return ret;
+}
+
+static int tegra_xhci_remove(struct platform_device *pdev)
+{
+ struct tegra_xhci_hcd *tegra = platform_get_drvdata(pdev);
+
+ phy_power_off(tegra->phy);
+ phy_exit(tegra->phy);
+
+ if (tegra->fw_data)
+ dma_free_coherent(tegra->dev, tegra->fw_size, tegra->fw_data,
+ tegra->fw_dma_addr);
+
+ tegra_xhci_unregister_mbox_notifier(&tegra->mbox_nb);
+ tegra_xhci_regulator_deinit(tegra);
+ tegra_xhci_clk_deinit(tegra);
+
+ return 0;
+}
+
+static struct platform_driver tegra_xhci_driver = {
+ .probe = tegra_xhci_probe,
+ .remove = tegra_xhci_remove,
+ .driver = {
+ .name = "tegra-xhci",
+ .of_match_table = of_match_ptr(tegra_xhci_of_match),
+ },
+};
+module_platform_driver(tegra_xhci_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra XHCI host-controller driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tegra-xhci");
diff --git a/drivers/usb/host/xhci-tegra.h b/drivers/usb/host/xhci-tegra.h
new file mode 100644
index 0000000..b65bfdb
--- /dev/null
+++ b/drivers/usb/host/xhci-tegra.h
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ * 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 __XHCI_TEGRA_H
+#define __XHCI_TEGRA_H
+
+/* FPCI CFG registers */
+#define XUSB_CFG_0 0x0
+#define XUSB_CFG_1 0x4
+#define XUSB_IO_SPACE_EN BIT(0)
+#define XUSB_MEM_SPACE_EN BIT(1)
+#define XUSB_BUS_MASTER_EN BIT(2)
+#define XUSB_CFG_4 0x10
+#define XUSB_CFG_16 0x40
+#define XUSB_CFG_24 0x60
+#define XUSB_CFG_ARU_MBOX_CMD 0xe4
+#define MBOX_FALC_INT_EN BIT(27)
+#define MBOX_PME_INT_EN BIT(28)
+#define MBOX_SMI_INT_EN BIT(29)
+#define MBOX_XHCI_INT_EN BIT(30)
+#define MBOX_INT_EN BIT(31)
+#define XUSB_CFG_ARU_MBOX_DATA_IN 0xe8
+#define CMD_DATA_SHIFT 0
+#define CMD_DATA_MASK 0xffffff
+#define CMD_TYPE_SHIFT 24
+#define CMD_TYPE_MASK 0xff
+#define XUSB_CFG_ARU_MBOX_DATA_OUT 0xec
+#define XUSB_CFG_ARU_MBOX_OWNER 0xf0
+#define MBOX_OWNER_NONE 0
+#define MBOX_OWNER_FW 1
+#define MBOX_OWNER_SW 2
+#define XUSB_CFG_FPCICFG 0xf8
+#define XUSB_CFG_ARU_C11PAGESEL0 0x400
+#define XUSB_CFG_ARU_C11PAGESEL1 0x404
+#define XUSB_CFG_ARU_C11_CSBRANGE 0x41c
+#define XUSB_CFG_ARU_SMI_INTR 0x428
+#define MBOX_SMI_INTR_FW_HANG BIT(1)
+#define MBOX_SMI_INTR_EN BIT(3)
+#define XUSB_CFG_ARU_RST 0x42c
+#define XUSB_CFG_ARU_CONTEXT 0x43c
+#define XUSB_CFG_ARU_FW_SCRATCH 0x440
+#define XUSB_CFG_ARU_CONTEXT_HS_PLS 0x478
+#define XUSB_CFG_ARU_CONTEXT_FS_PLS 0x47c
+#define XUSB_CFG_ARU_CONTEXT_HSFS_SPEED 0x480
+#define XUSB_CFG_ARU_CONTEXT_HSFS_PP 0x484
+#define XUSB_CFG_HSPX_CORE_HSICWRAP 0x658
+#define XUSB_CFG_CSB_BASE_ADDR 0x800
+
+/* IPFS registers */
+#define IPFS_XUSB_HOST_MSI_BAR_SZ_0 0xc0
+#define IPFS_XUSB_HOST_MSI_AXI_BAR_ST_0 0xc4
+#define IPFS_XUSB_HOST_FPCI_BAR_ST_0 0xc8
+#define IPFS_XUSB_HOST_MSI_VEC0_0 0x100
+#define IPFS_XUSB_HOST_MSI_EN_VEC0_0 0x140
+#define IPFS_XUSB_HOST_CONFIGURATION_0 0x180
+#define IPFS_EN_FPCI BIT(0)
+#define IPFS_XUSB_HOST_FPCI_ERROR_MASKS_0 0x184
+#define IPFS_XUSB_HOST_INTR_MASK_0 0x188
+#define IPFS_IP_INT_MASK BIT(16)
+#define IPFS_XUSB_HOST_IPFS_INTR_ENABLE_0 0x198
+#define IPFS_XUSB_HOST_UFPCI_CONFIG_0 0x19c
+#define IPFS_XUSB_HOST_CLKGATE_HYSTERESIS_0 0x1bc
+#define IPFS_XUSB_HOST_MCCIF_FIFOCTRL_0 0x1dc
+
+#define IMEM_BLOCK_SIZE 256
+
+#define CSB_PAGE_SELECT_MASK 0x7fffff
+#define CSB_PAGE_SELECT_SHIFT 9
+#define CSB_PAGE_OFFSET_MASK 0x1ff
+#define CSB_PAGE_SELECT(addr) ((addr) >> (CSB_PAGE_SELECT_SHIFT) & \
+ CSB_PAGE_SELECT_MASK)
+#define CSB_PAGE_OFFSET(addr) ((addr) & CSB_PAGE_OFFSET_MASK)
+
+/* Falcon CSB registers */
+#define XUSB_FALC_CPUCTL 0x100
+#define CPUCTL_STARTCPU BIT(1)
+#define CPUCTL_STATE_HALTED BIT(4)
+#define XUSB_FALC_BOOTVEC 0x104
+#define XUSB_FALC_DMACTL 0x10c
+#define XUSB_FALC_IMFILLRNG1 0x154
+#define IMFILLRNG1_TAG_MASK 0xffff
+#define IMFILLRNG1_TAG_HI_SHIFT 16
+#define XUSB_FALC_IMFILLCTL 0x158
+#define XUSB_FALC_CMEMBASE 0x160
+#define XUSB_FALC_DMEMAPERT 0x164
+#define XUSB_FALC_IMEMC_START 0x180
+#define XUSB_FALC_IMEMD_START 0x184
+#define XUSB_FALC_IMEMT_START 0x188
+#define XUSB_FALC_ICD_CMD 0x200
+#define XUSB_FALC_ICD_RDATA 0x20C
+#define XUSB_FALC_SS_PVTPORTSC1 0x116000
+#define XUSB_FALC_SS_PVTPORTSC2 0x116004
+#define XUSB_FALC_SS_PVTPORTSC3 0x116008
+#define XUSB_FALC_HS_PVTPORTSC1 0x116800
+#define XUSB_FALC_HS_PVTPORTSC2 0x116804
+#define XUSB_FALC_HS_PVTPORTSC3 0x116808
+#define XUSB_FALC_FS_PVTPORTSC1 0x117000
+#define XUSB_FALC_FS_PVTPORTSC2 0x117004
+#define XUSB_FALC_FS_PVTPORTSC3 0x117008
+
+/* MP CSB registers */
+#define XUSB_CSB_MP_ILOAD_ATTR 0x101a00
+#define XUSB_CSB_MP_ILOAD_BASE_LO 0x101a04
+#define XUSB_CSB_MP_ILOAD_BASE_HI 0x101a08
+#define XUSB_CSB_MP_L2IMEMOP_SIZE 0x101a10
+#define L2IMEMOP_SIZE_SRC_OFFSET_SHIFT 8
+#define L2IMEMOP_SIZE_SRC_OFFSET_MASK 0x3ff
+#define L2IMEMOP_SIZE_SRC_COUNT_SHIFT 24
+#define L2IMEMOP_SIZE_SRC_COUNT_MASK 0xff
+#define XUSB_CSB_MP_L2IMEMOP_TRIG 0x101a14
+#define L2IMEMOP_ACTION_SHIFT 24
+#define L2IMEMOP_INVALIDATE_ALL (0x40 << L2IMEMOP_ACTION_SHIFT)
+#define L2IMEMOP_LOAD_LOCKED_RESULT (0x11 << L2IMEMOP_ACTION_SHIFT)
+#define XUSB_CSB_MP_APMAP 0x10181c
+#define APMAP_BOOTPATH BIT(31)
+
+#endif /* __XHCI_TEGRA_H */
diff --git a/include/linux/usb/tegra_xusb.h b/include/linux/usb/tegra_xusb.h
new file mode 100644
index 0000000..1a654e7
--- /dev/null
+++ b/include/linux/usb/tegra_xusb.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ * 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 __TEGRA_XUSB_H
+#define __TEGRA_XUSB_H
+
+/* Command requests from the firmware */
+enum tegra_xusb_mbox_cmd {
+ MBOX_CMD_MSG_ENABLED = 1,
+ MBOX_CMD_INC_FALC_CLOCK,
+ MBOX_CMD_DEC_FALC_CLOCK,
+ MBOX_CMD_INC_SSPI_CLOCK,
+ MBOX_CMD_DEC_SSPI_CLOCK,
+ MBOX_CMD_SET_BW, /* no ACK/NAK required */
+ MBOX_CMD_SET_SS_PWR_GATING,
+ MBOX_CMD_SET_SS_PWR_UNGATING,
+ MBOX_CMD_SAVE_DFE_CTLE_CTX,
+ MBOX_CMD_AIRPLANE_MODE_ENABLED, /* unused */
+ MBOX_CMD_AIRPLANE_MODE_DISABLED, /* unused */
+ MBOX_CMD_START_HSIC_IDLE,
+ MBOX_CMD_STOP_HSIC_IDLE,
+ MBOX_CMD_DBC_WAKE_STACK, /* unused */
+ MBOX_CMD_HSIC_PRETEND_CONNECT,
+
+ MBOX_CMD_MAX,
+
+ /* Response message to above commands */
+ MBOX_CMD_ACK = 128,
+ MBOX_CMD_NAK
+};
+
+struct notifier_block;
+
+/*
+ * Tegra XUSB MBOX handler interface:
+ * - Drivers which may handle mbox messages should register a notifier.
+ * - The notifier event will be an mbox command (above) and the data will
+ * be a pointer to struct mbox_notifier_data.
+ * - If a notifier has handled the message, it should return NOTIFY_STOP
+ * and populate resp_{cmd,data} appropriately.
+ * - A resp_cmd of 0 indicates that no response should be sent.
+ */
+struct mbox_notifier_data {
+ u32 msg_data; /* Inbound message data */
+ u32 resp_cmd; /* Response message command */
+ u32 resp_data; /* Response message data */
+};
+
+extern int tegra_xhci_register_mbox_notifier(struct notifier_block *nb);
+extern void tegra_xhci_unregister_mbox_notifier(struct notifier_block *nb);
+
+#endif /* __TEGRA_XUSB_H */
--
1.9.1.423.g4596e3a
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