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// SPDX-License-Identifier: GPL-2.0
* mtu3.h - MediaTek USB3 DRD header
* Copyright (C) 2016 MediaTek Inc.
* Author: Chunfeng Yun <>
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
#ifndef __MTU3_H__
#define __MTU3_H__
#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/extcon.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/phy/phy.h>
#include <linux/regulator/consumer.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
struct mtu3;
struct mtu3_ep;
struct mtu3_request;
#include "mtu3_hw_regs.h"
#include "mtu3_qmu.h"
#define MU3D_EP_TXCR0(epnum) (U3D_TX1CSR0 + (((epnum) - 1) * 0x10))
#define MU3D_EP_TXCR1(epnum) (U3D_TX1CSR1 + (((epnum) - 1) * 0x10))
#define MU3D_EP_TXCR2(epnum) (U3D_TX1CSR2 + (((epnum) - 1) * 0x10))
#define MU3D_EP_RXCR0(epnum) (U3D_RX1CSR0 + (((epnum) - 1) * 0x10))
#define MU3D_EP_RXCR1(epnum) (U3D_RX1CSR1 + (((epnum) - 1) * 0x10))
#define MU3D_EP_RXCR2(epnum) (U3D_RX1CSR2 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQCSR(epnum) (U3D_RXQCSR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQSAR(epnum) (U3D_RXQSAR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQCPR(epnum) (U3D_RXQCPR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_TQCSR(epnum) (U3D_TXQCSR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_TQSAR(epnum) (U3D_TXQSAR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_TQCPR(epnum) (U3D_TXQCPR1 + (((epnum) - 1) * 0x10))
#define SSUSB_U3_CTRL(p) (U3D_SSUSB_U3_CTRL_0P + ((p) * 0x08))
#define SSUSB_U2_CTRL(p) (U3D_SSUSB_U2_CTRL_0P + ((p) * 0x08))
#define MTU3_DRIVER_NAME "mtu3"
#define DMA_ADDR_INVALID (~(dma_addr_t)0)
#define MTU3_EP_ENABLED BIT(0)
#define MTU3_EP_STALL BIT(1)
#define MTU3_EP_WEDGE BIT(2)
#define MTU3_EP_BUSY BIT(3)
* Normally the device works on HS or SS, to simplify fifo management,
* devide fifo into some 512B parts, use bitmap to manage it; And
* 128 bits size of bitmap is large enough, that means it can manage
* up to 64KB fifo size.
* NOTE: MTU3_EP_FIFO_UNIT should be power of two
#define MTU3_EP_FIFO_UNIT (1 << 9)
#define MTU3_FIFO_BIT_SIZE 128
#define MTU3_U2_IP_EP0_FIFO_SIZE 64
* Maximum size of ep0 response buffer for ch9 requests,
* the SET_SEL request uses 6 so far, and GET_STATUS is 2
#define EP0_RESPONSE_BUF 6
/* device operated link and speed got from DEVICE_CONF register */
enum mtu3_speed {
* @MU3D_EP0_STATE_SETUP: waits for SETUP or received a SETUP
* without data stage.
* @MU3D_EP0_STATE_TX: IN data stage
* @MU3D_EP0_STATE_RX: OUT data stage
* @MU3D_EP0_STATE_TX_END: the last IN data is transferred, and
* waits for its completion interrupt
* @MU3D_EP0_STATE_STALL: ep0 is in stall status, will be auto-cleared
* after receives a SETUP.
enum mtu3_g_ep0_state {
* @base: the base address of fifo
* @limit: the bitmap size in bits
* @bitmap: fifo bitmap in unit of @MTU3_EP_FIFO_UNIT
struct mtu3_fifo_info {
u32 base;
u32 limit;
* General Purpose Descriptor (GPD):
* The format of TX GPD is a little different from RX one.
* And the size of GPD is 16 bytes.
* @flag:
* bit0: Hardware Own (HWO)
* bit1: Buffer Descriptor Present (BDP), always 0, BD is not supported
* bit2: Bypass (BPS), 1: HW skips this GPD if HWO = 1
* bit7: Interrupt On Completion (IOC)
* @chksum: This is used to validate the contents of this GPD;
* If TXQ_CS_EN / RXQ_CS_EN bit is set, an interrupt is issued
* when checksum validation fails;
* Checksum value is calculated over the 16 bytes of the GPD by default;
* @data_buf_len (RX ONLY): This value indicates the length of
* the assigned data buffer
* @next_gpd: Physical address of the next GPD
* @buffer: Physical address of the data buffer
* @buf_len:
* (TX): This value indicates the length of the assigned data buffer
* (RX): The total length of data received
* @ext_len: reserved
* @ext_flag:
* bit5 (TX ONLY): Zero Length Packet (ZLP),
struct qmu_gpd {
__u8 flag;
__u8 chksum;
__le16 data_buf_len;
__le32 next_gpd;
__le32 buffer;
__le16 buf_len;
__u8 ext_len;
__u8 ext_flag;
} __packed;
* dma: physical base address of GPD segment
* start: virtual base address of GPD segment
* end: the last GPD element
* enqueue: the first empty GPD to use
* dequeue: the first completed GPD serviced by ISR
* NOTE: the size of GPD ring should be >= 2
struct mtu3_gpd_ring {
dma_addr_t dma;
struct qmu_gpd *start;
struct qmu_gpd *end;
struct qmu_gpd *enqueue;
struct qmu_gpd *dequeue;
* @vbus: vbus 5V used by host mode
* @edev: external connector used to detect vbus and iddig changes
* @vbus_nb: notifier for vbus detection
* @vbus_nb: notifier for iddig(idpin) detection
* @extcon_reg_dwork: delay work for extcon notifier register, waiting for
* xHCI driver initialization, it's necessary for system bootup
* as device.
* @is_u3_drd: whether port0 supports usb3.0 dual-role device or not
* @id_*: used to maually switch between host and device modes by idpin
* @manual_drd_enabled: it's true when supports dual-role device by debugfs
* to switch host/device modes depending on user input.
struct otg_switch_mtk {
struct regulator *vbus;
struct extcon_dev *edev;
struct notifier_block vbus_nb;
struct notifier_block id_nb;
struct delayed_work extcon_reg_dwork;
bool is_u3_drd;
/* dual-role switch by debugfs */
struct pinctrl *id_pinctrl;
struct pinctrl_state *id_float;
struct pinctrl_state *id_ground;
bool manual_drd_enabled;
* @mac_base: register base address of device MAC, exclude xHCI's
* @ippc_base: register base address of IP Power and Clock interface (IPPC)
* @vusb33: usb3.3V shared by device/host IP
* @sys_clk: system clock of mtu3, shared by device/host IP
* @dr_mode: works in which mode:
* host only, device only or dual-role mode
* @u2_ports: number of usb2.0 host ports
* @u3_ports: number of usb3.0 host ports
* @dbgfs_root: only used when supports manual dual-role switch via debugfs
* @wakeup_en: it's true when supports remote wakeup in host mode
* @wk_deb_p0: port0's wakeup debounce clock
* @wk_deb_p1: it's optional, and depends on port1 is supported or not
struct ssusb_mtk {
struct device *dev;
struct mtu3 *u3d;
void __iomem *mac_base;
void __iomem *ippc_base;
struct phy **phys;
int num_phys;
/* common power & clock */
struct regulator *vusb33;
struct clk *sys_clk;
struct clk *ref_clk;
/* otg */
struct otg_switch_mtk otg_switch;
enum usb_dr_mode dr_mode;
bool is_host;
int u2_ports;
int u3_ports;
struct dentry *dbgfs_root;
/* usb wakeup for host mode */
bool wakeup_en;
struct clk *wk_deb_p0;
struct clk *wk_deb_p1;
struct regmap *pericfg;
* @fifo_size: it is (@slot + 1) * @fifo_seg_size
* @fifo_seg_size: it is roundup_pow_of_two(@maxp)
struct mtu3_ep {
struct usb_ep ep;
char name[12];
struct mtu3 *mtu;
u8 epnum;
u8 type;
u8 is_in;
u16 maxp;
int slot;
u32 fifo_size;
u32 fifo_addr;
u32 fifo_seg_size;
struct mtu3_fifo_info *fifo;
struct list_head req_list;
struct mtu3_gpd_ring gpd_ring;
const struct usb_ss_ep_comp_descriptor *comp_desc;
const struct usb_endpoint_descriptor *desc;
int flags;
u8 wedged;
u8 busy;
struct mtu3_request {
struct usb_request request;
struct list_head list;
struct mtu3_ep *mep;
struct mtu3 *mtu;
struct qmu_gpd *gpd;
int epnum;
static inline struct ssusb_mtk *dev_to_ssusb(struct device *dev)
return dev_get_drvdata(dev);
* struct mtu3 - device driver instance data.
* @slot: MTU3_U2_IP_SLOT_DEFAULT for U2 IP only,
* @may_wakeup: means device's remote wakeup is enabled
* @is_self_powered: is reported in device status and the config descriptor
* @delayed_status: true when function drivers ask for delayed status
* @ep0_req: dummy request used while handling standard USB requests
* @setup_buf: ep0 response buffer for GET_STATUS and SET_SEL requests
struct mtu3 {
spinlock_t lock;
struct ssusb_mtk *ssusb;
struct device *dev;
void __iomem *mac_base;
void __iomem *ippc_base;
int irq;
struct mtu3_fifo_info tx_fifo;
struct mtu3_fifo_info rx_fifo;
struct mtu3_ep *ep_array;
struct mtu3_ep *in_eps;
struct mtu3_ep *out_eps;
struct mtu3_ep *ep0;
int num_eps;
int slot;
int active_ep;
struct dma_pool *qmu_gpd_pool;
enum mtu3_g_ep0_state ep0_state;
struct usb_gadget g; /* the gadget */
struct usb_gadget_driver *gadget_driver;
struct mtu3_request ep0_req;
u8 setup_buf[EP0_RESPONSE_BUF];
u32 max_speed;
unsigned is_active:1;
unsigned may_wakeup:1;
unsigned is_self_powered:1;
unsigned test_mode:1;
unsigned softconnect:1;
unsigned u1_enable:1;
unsigned u2_enable:1;
unsigned is_u3_ip:1;
unsigned delayed_status:1;
u8 address;
u8 test_mode_nr;
u32 hw_version;
static inline struct mtu3 *gadget_to_mtu3(struct usb_gadget *g)
return container_of(g, struct mtu3, g);
static inline int is_first_entry(const struct list_head *list,
const struct list_head *head)
return list_is_last(head, list);
static inline struct mtu3_request *to_mtu3_request(struct usb_request *req)
return req ? container_of(req, struct mtu3_request, request) : NULL;
static inline struct mtu3_ep *to_mtu3_ep(struct usb_ep *ep)
return ep ? container_of(ep, struct mtu3_ep, ep) : NULL;
static inline struct mtu3_request *next_request(struct mtu3_ep *mep)
return list_first_entry_or_null(&mep->req_list, struct mtu3_request,
static inline void mtu3_writel(void __iomem *base, u32 offset, u32 data)
writel(data, base + offset);
static inline u32 mtu3_readl(void __iomem *base, u32 offset)
return readl(base + offset);
static inline void mtu3_setbits(void __iomem *base, u32 offset, u32 bits)
void __iomem *addr = base + offset;
u32 tmp = readl(addr);
writel((tmp | (bits)), addr);
static inline void mtu3_clrbits(void __iomem *base, u32 offset, u32 bits)
void __iomem *addr = base + offset;
u32 tmp = readl(addr);
writel((tmp & ~(bits)), addr);
int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks);
struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags);
void mtu3_free_request(struct usb_ep *ep, struct usb_request *req);
void mtu3_req_complete(struct mtu3_ep *mep,
struct usb_request *req, int status);
int mtu3_config_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
int interval, int burst, int mult);
void mtu3_deconfig_ep(struct mtu3 *mtu, struct mtu3_ep *mep);
void mtu3_ep_stall_set(struct mtu3_ep *mep, bool set);
void mtu3_ep0_setup(struct mtu3 *mtu);
void mtu3_start(struct mtu3 *mtu);
void mtu3_stop(struct mtu3 *mtu);
void mtu3_dev_on_off(struct mtu3 *mtu, int is_on);
int mtu3_gadget_setup(struct mtu3 *mtu);
void mtu3_gadget_cleanup(struct mtu3 *mtu);
void mtu3_gadget_reset(struct mtu3 *mtu);
void mtu3_gadget_suspend(struct mtu3 *mtu);
void mtu3_gadget_resume(struct mtu3 *mtu);
void mtu3_gadget_disconnect(struct mtu3 *mtu);
irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu);
extern const struct usb_ep_ops mtu3_ep0_ops;