// SPDX-License-Identifier: GPL-2.0
/*
 * core.h - DesignWare USB3 DRD Core Header
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 */

#ifndef __DRIVERS_USB_DWC3_CORE_H
#define __DRIVERS_USB_DWC3_CORE_H

#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/debugfs.h>
#include <linux/wait.h>
#include <linux/workqueue.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/ulpi/interface.h>

#include <linux/phy/phy.h>

#define DWC3_MSG_MAX    500

/* Global constants */
#define DWC3_PULL_UP_TIMEOUT    500     /* ms */
#define DWC3_BOUNCE_SIZE        1024    /* size of a superspeed bulk */
#define DWC3_EP0_SETUP_SIZE     512
#define DWC3_ENDPOINTS_NUM      32
#define DWC3_XHCI_RESOURCES_NUM 2

#define DWC3_SCRATCHBUF_SIZE    4096    /* each buffer is assumed to be 4KiB */
#define DWC3_EVENT_BUFFERS_SIZE 4096
#define DWC3_EVENT_TYPE_MASK    0xfe

#define DWC3_EVENT_TYPE_DEV     0
#define DWC3_EVENT_TYPE_CARKIT  3
#define DWC3_EVENT_TYPE_I2C     4

#define DWC3_DEVICE_EVENT_DISCONNECT            0
#define DWC3_DEVICE_EVENT_RESET                 1
#define DWC3_DEVICE_EVENT_CONNECT_DONE          2
#define DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE    3
#define DWC3_DEVICE_EVENT_WAKEUP                4
#define DWC3_DEVICE_EVENT_HIBER_REQ             5
#define DWC3_DEVICE_EVENT_EOPF                  6
#define DWC3_DEVICE_EVENT_SOF                   7
#define DWC3_DEVICE_EVENT_ERRATIC_ERROR         9
#define DWC3_DEVICE_EVENT_CMD_CMPL              10
#define DWC3_DEVICE_EVENT_OVERFLOW              11

/* Controller's role while using the OTG block */
#define DWC3_OTG_ROLE_IDLE      0
#define DWC3_OTG_ROLE_HOST      1
#define DWC3_OTG_ROLE_DEVICE    2

#define DWC3_GEVNTCOUNT_MASK    0xfffc
#define DWC3_GEVNTCOUNT_EHB     BIT(31)
#define DWC3_GSNPSID_MASK       0xffff0000
#define DWC3_GSNPSREV_MASK      0xffff

/* DWC3 registers memory space boundries */
#define DWC3_XHCI_REGS_START            0x0
#define DWC3_XHCI_REGS_END              0x7fff
#define DWC3_GLOBALS_REGS_START         0xc100
#define DWC3_GLOBALS_REGS_END           0xc6ff
#define DWC3_DEVICE_REGS_START          0xc700
#define DWC3_DEVICE_REGS_END            0xcbff
#define DWC3_OTG_REGS_START             0xcc00
#define DWC3_OTG_REGS_END               0xccff

/* Global Registers */
#define DWC3_GSBUSCFG0          0xc100
#define DWC3_GSBUSCFG1          0xc104
#define DWC3_GTXTHRCFG          0xc108
#define DWC3_GRXTHRCFG          0xc10c
#define DWC3_GCTL               0xc110
#define DWC3_GEVTEN             0xc114
#define DWC3_GSTS               0xc118
#define DWC3_GUCTL1             0xc11c
#define DWC3_GSNPSID            0xc120
#define DWC3_GGPIO              0xc124
#define DWC3_GUID               0xc128
#define DWC3_GUCTL              0xc12c
#define DWC3_GBUSERRADDR0       0xc130
#define DWC3_GBUSERRADDR1       0xc134
#define DWC3_GPRTBIMAP0         0xc138
#define DWC3_GPRTBIMAP1         0xc13c
#define DWC3_GHWPARAMS0         0xc140
#define DWC3_GHWPARAMS1         0xc144
#define DWC3_GHWPARAMS2         0xc148
#define DWC3_GHWPARAMS3         0xc14c
#define DWC3_GHWPARAMS4         0xc150
#define DWC3_GHWPARAMS5         0xc154
#define DWC3_GHWPARAMS6         0xc158
#define DWC3_GHWPARAMS7         0xc15c
#define DWC3_GDBGFIFOSPACE      0xc160
#define DWC3_GDBGLTSSM          0xc164
#define DWC3_GDBGBMU            0xc16c
#define DWC3_GDBGLSPMUX         0xc170
#define DWC3_GDBGLSP            0xc174
#define DWC3_GDBGEPINFO0        0xc178
#define DWC3_GDBGEPINFO1        0xc17c
#define DWC3_GPRTBIMAP_HS0      0xc180
#define DWC3_GPRTBIMAP_HS1      0xc184
#define DWC3_GPRTBIMAP_FS0      0xc188
#define DWC3_GPRTBIMAP_FS1      0xc18c
#define DWC3_GUCTL2             0xc19c

#define DWC3_VER_NUMBER         0xc1a0
#define DWC3_VER_TYPE           0xc1a4

#define DWC3_GUSB2PHYCFG(n)     (0xc200 + ((n) * 0x04))
#define DWC3_GUSB2I2CCTL(n)     (0xc240 + ((n) * 0x04))

#define DWC3_GUSB2PHYACC(n)     (0xc280 + ((n) * 0x04))

#define DWC3_GUSB3PIPECTL(n)    (0xc2c0 + ((n) * 0x04))

#define DWC3_GTXFIFOSIZ(n)      (0xc300 + ((n) * 0x04))
#define DWC3_GRXFIFOSIZ(n)      (0xc380 + ((n) * 0x04))

#define DWC3_GEVNTADRLO(n)      (0xc400 + ((n) * 0x10))
#define DWC3_GEVNTADRHI(n)      (0xc404 + ((n) * 0x10))
#define DWC3_GEVNTSIZ(n)        (0xc408 + ((n) * 0x10))
#define DWC3_GEVNTCOUNT(n)      (0xc40c + ((n) * 0x10))

#define DWC3_GHWPARAMS8         0xc600
#define DWC3_GFLADJ             0xc630

/* Device Registers */
#define DWC3_DCFG               0xc700
#define DWC3_DCTL               0xc704
#define DWC3_DEVTEN             0xc708
#define DWC3_DSTS               0xc70c
#define DWC3_DGCMDPAR           0xc710
#define DWC3_DGCMD              0xc714
#define DWC3_DALEPENA           0xc720

#define DWC3_DEP_BASE(n)        (0xc800 + ((n) * 0x10))
#define DWC3_DEPCMDPAR2         0x00
#define DWC3_DEPCMDPAR1         0x04
#define DWC3_DEPCMDPAR0         0x08
#define DWC3_DEPCMD             0x0c

#define DWC3_DEV_IMOD(n)        (0xca00 + ((n) * 0x4))

/* OTG Registers */
#define DWC3_OCFG               0xcc00
#define DWC3_OCTL               0xcc04
#define DWC3_OEVT               0xcc08
#define DWC3_OEVTEN             0xcc0C
#define DWC3_OSTS               0xcc10

/* Bit fields */

/* Global Debug Queue/FIFO Space Available Register */
#define DWC3_GDBGFIFOSPACE_NUM(n)       ((n) & 0x1f)
#define DWC3_GDBGFIFOSPACE_TYPE(n)      (((n) << 5) & 0x1e0)
#define DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(n) (((n) >> 16) & 0xffff)

#define DWC3_TXFIFOQ            0
#define DWC3_RXFIFOQ            1
#define DWC3_TXREQQ             2
#define DWC3_RXREQQ             3
#define DWC3_RXINFOQ            4
#define DWC3_PSTATQ             5
#define DWC3_DESCFETCHQ         6
#define DWC3_EVENTQ             7
#define DWC3_AUXEVENTQ          8

/* Global RX Threshold Configuration Register */
#define DWC3_GRXTHRCFG_MAXRXBURSTSIZE(n) (((n) & 0x1f) << 19)
#define DWC3_GRXTHRCFG_RXPKTCNT(n) (((n) & 0xf) << 24)
#define DWC3_GRXTHRCFG_PKTCNTSEL BIT(29)

/* Global RX Threshold Configuration Register for DWC_usb31 only */
#define DWC31_GRXTHRCFG_MAXRXBURSTSIZE(n)       (((n) & 0x1f) << 16)
#define DWC31_GRXTHRCFG_RXPKTCNT(n)             (((n) & 0x1f) << 21)
#define DWC31_GRXTHRCFG_PKTCNTSEL               BIT(26)
#define DWC31_RXTHRNUMPKTSEL_HS_PRD             BIT(15)
#define DWC31_RXTHRNUMPKT_HS_PRD(n)             (((n) & 0x3) << 13)
#define DWC31_RXTHRNUMPKTSEL_PRD                BIT(10)
#define DWC31_RXTHRNUMPKT_PRD(n)                (((n) & 0x1f) << 5)
#define DWC31_MAXRXBURSTSIZE_PRD(n)             ((n) & 0x1f)

/* Global TX Threshold Configuration Register for DWC_usb31 only */
#define DWC31_GTXTHRCFG_MAXTXBURSTSIZE(n)       (((n) & 0x1f) << 16)
#define DWC31_GTXTHRCFG_TXPKTCNT(n)             (((n) & 0x1f) << 21)
#define DWC31_GTXTHRCFG_PKTCNTSEL               BIT(26)
#define DWC31_TXTHRNUMPKTSEL_HS_PRD             BIT(15)
#define DWC31_TXTHRNUMPKT_HS_PRD(n)             (((n) & 0x3) << 13)
#define DWC31_TXTHRNUMPKTSEL_PRD                BIT(10)
#define DWC31_TXTHRNUMPKT_PRD(n)                (((n) & 0x1f) << 5)
#define DWC31_MAXTXBURSTSIZE_PRD(n)             ((n) & 0x1f)

/* Global Configuration Register */
#define DWC3_GCTL_PWRDNSCALE(n) ((n) << 19)
#define DWC3_GCTL_U2RSTECN      BIT(16)
#define DWC3_GCTL_RAMCLKSEL(x)  (((x) & DWC3_GCTL_CLK_MASK) << 6)
#define DWC3_GCTL_CLK_BUS       (0)
#define DWC3_GCTL_CLK_PIPE      (1)
#define DWC3_GCTL_CLK_PIPEHALF  (2)
#define DWC3_GCTL_CLK_MASK      (3)

#define DWC3_GCTL_PRTCAP(n)     (((n) & (3 << 12)) >> 12)
#define DWC3_GCTL_PRTCAPDIR(n)  ((n) << 12)
#define DWC3_GCTL_PRTCAP_HOST   1
#define DWC3_GCTL_PRTCAP_DEVICE 2
#define DWC3_GCTL_PRTCAP_OTG    3

#define DWC3_GCTL_CORESOFTRESET         BIT(11)
#define DWC3_GCTL_SOFITPSYNC            BIT(10)
#define DWC3_GCTL_SCALEDOWN(n)          ((n) << 4)
#define DWC3_GCTL_SCALEDOWN_MASK        DWC3_GCTL_SCALEDOWN(3)
#define DWC3_GCTL_DISSCRAMBLE           BIT(3)
#define DWC3_GCTL_U2EXIT_LFPS           BIT(2)
#define DWC3_GCTL_GBLHIBERNATIONEN      BIT(1)
#define DWC3_GCTL_DSBLCLKGTNG           BIT(0)

/* Global User Control 1 Register */
#define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS      BIT(28)
#define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW   BIT(24)

/* Global Status Register */
#define DWC3_GSTS_OTG_IP        BIT(10)
#define DWC3_GSTS_BC_IP         BIT(9)
#define DWC3_GSTS_ADP_IP        BIT(8)
#define DWC3_GSTS_HOST_IP       BIT(7)
#define DWC3_GSTS_DEVICE_IP     BIT(6)
#define DWC3_GSTS_CSR_TIMEOUT   BIT(5)
#define DWC3_GSTS_BUS_ERR_ADDR_VLD      BIT(4)

/* Global USB2 PHY Configuration Register */
#define DWC3_GUSB2PHYCFG_PHYSOFTRST     BIT(31)
#define DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS      BIT(30)
#define DWC3_GUSB2PHYCFG_SUSPHY         BIT(6)
#define DWC3_GUSB2PHYCFG_ULPI_UTMI      BIT(4)
#define DWC3_GUSB2PHYCFG_ENBLSLPM       BIT(8)
#define DWC3_GUSB2PHYCFG_PHYIF(n)       (n << 3)
#define DWC3_GUSB2PHYCFG_PHYIF_MASK     DWC3_GUSB2PHYCFG_PHYIF(1)
#define DWC3_GUSB2PHYCFG_USBTRDTIM(n)   (n << 10)
#define DWC3_GUSB2PHYCFG_USBTRDTIM_MASK DWC3_GUSB2PHYCFG_USBTRDTIM(0xf)
#define USBTRDTIM_UTMI_8_BIT            9
#define USBTRDTIM_UTMI_16_BIT           5
#define UTMI_PHYIF_16_BIT               1
#define UTMI_PHYIF_8_BIT                0

/* Global USB2 PHY Vendor Control Register */
#define DWC3_GUSB2PHYACC_NEWREGREQ      BIT(25)
#define DWC3_GUSB2PHYACC_BUSY           BIT(23)
#define DWC3_GUSB2PHYACC_WRITE          BIT(22)
#define DWC3_GUSB2PHYACC_ADDR(n)        (n << 16)
#define DWC3_GUSB2PHYACC_EXTEND_ADDR(n) (n << 8)
#define DWC3_GUSB2PHYACC_DATA(n)        (n & 0xff)

/* Global USB3 PIPE Control Register */
#define DWC3_GUSB3PIPECTL_PHYSOFTRST    BIT(31)
#define DWC3_GUSB3PIPECTL_U2SSINP3OK    BIT(29)
#define DWC3_GUSB3PIPECTL_DISRXDETINP3  BIT(28)
#define DWC3_GUSB3PIPECTL_UX_EXIT_PX    BIT(27)
#define DWC3_GUSB3PIPECTL_REQP1P2P3     BIT(24)
#define DWC3_GUSB3PIPECTL_DEP1P2P3(n)   ((n) << 19)
#define DWC3_GUSB3PIPECTL_DEP1P2P3_MASK DWC3_GUSB3PIPECTL_DEP1P2P3(7)
#define DWC3_GUSB3PIPECTL_DEP1P2P3_EN   DWC3_GUSB3PIPECTL_DEP1P2P3(1)
#define DWC3_GUSB3PIPECTL_DEPOCHANGE    BIT(18)
#define DWC3_GUSB3PIPECTL_SUSPHY        BIT(17)
#define DWC3_GUSB3PIPECTL_LFPSFILT      BIT(9)
#define DWC3_GUSB3PIPECTL_RX_DETOPOLL   BIT(8)
#define DWC3_GUSB3PIPECTL_TX_DEEPH_MASK DWC3_GUSB3PIPECTL_TX_DEEPH(3)
#define DWC3_GUSB3PIPECTL_TX_DEEPH(n)   ((n) << 1)

/* Global TX Fifo Size Register */
#define DWC31_GTXFIFOSIZ_TXFRAMNUM      BIT(15)         /* DWC_usb31 only */
#define DWC31_GTXFIFOSIZ_TXFDEF(n)      ((n) & 0x7fff)  /* DWC_usb31 only */
#define DWC3_GTXFIFOSIZ_TXFDEF(n)       ((n) & 0xffff)
#define DWC3_GTXFIFOSIZ_TXFSTADDR(n)    ((n) & 0xffff0000)

/* Global Event Size Registers */
#define DWC3_GEVNTSIZ_INTMASK           BIT(31)
#define DWC3_GEVNTSIZ_SIZE(n)           ((n) & 0xffff)

/* Global HWPARAMS0 Register */
#define DWC3_GHWPARAMS0_MODE(n)         ((n) & 0x3)
#define DWC3_GHWPARAMS0_MODE_GADGET     0
#define DWC3_GHWPARAMS0_MODE_HOST       1
#define DWC3_GHWPARAMS0_MODE_DRD        2
#define DWC3_GHWPARAMS0_MBUS_TYPE(n)    (((n) >> 3) & 0x7)
#define DWC3_GHWPARAMS0_SBUS_TYPE(n)    (((n) >> 6) & 0x3)
#define DWC3_GHWPARAMS0_MDWIDTH(n)      (((n) >> 8) & 0xff)
#define DWC3_GHWPARAMS0_SDWIDTH(n)      (((n) >> 16) & 0xff)
#define DWC3_GHWPARAMS0_AWIDTH(n)       (((n) >> 24) & 0xff)

/* Global HWPARAMS1 Register */
#define DWC3_GHWPARAMS1_EN_PWROPT(n)    (((n) & (3 << 24)) >> 24)
#define DWC3_GHWPARAMS1_EN_PWROPT_NO    0
#define DWC3_GHWPARAMS1_EN_PWROPT_CLK   1
#define DWC3_GHWPARAMS1_EN_PWROPT_HIB   2
#define DWC3_GHWPARAMS1_PWROPT(n)       ((n) << 24)
#define DWC3_GHWPARAMS1_PWROPT_MASK     DWC3_GHWPARAMS1_PWROPT(3)

/* Global HWPARAMS3 Register */
#define DWC3_GHWPARAMS3_SSPHY_IFC(n)            ((n) & 3)
#define DWC3_GHWPARAMS3_SSPHY_IFC_DIS           0
#define DWC3_GHWPARAMS3_SSPHY_IFC_GEN1          1
#define DWC3_GHWPARAMS3_SSPHY_IFC_GEN2          2 /* DWC_usb31 only */
#define DWC3_GHWPARAMS3_HSPHY_IFC(n)            (((n) & (3 << 2)) >> 2)
#define DWC3_GHWPARAMS3_HSPHY_IFC_DIS           0
#define DWC3_GHWPARAMS3_HSPHY_IFC_UTMI          1
#define DWC3_GHWPARAMS3_HSPHY_IFC_ULPI          2
#define DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI     3
#define DWC3_GHWPARAMS3_FSPHY_IFC(n)            (((n) & (3 << 4)) >> 4)
#define DWC3_GHWPARAMS3_FSPHY_IFC_DIS           0
#define DWC3_GHWPARAMS3_FSPHY_IFC_ENA           1

/* Global HWPARAMS4 Register */
#define DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(n)    (((n) & (0x0f << 13)) >> 13)
#define DWC3_MAX_HIBER_SCRATCHBUFS              15

/* Global HWPARAMS6 Register */
#define DWC3_GHWPARAMS6_BCSUPPORT               BIT(14)
#define DWC3_GHWPARAMS6_OTG3SUPPORT             BIT(13)
#define DWC3_GHWPARAMS6_ADPSUPPORT              BIT(12)
#define DWC3_GHWPARAMS6_HNPSUPPORT              BIT(11)
#define DWC3_GHWPARAMS6_SRPSUPPORT              BIT(10)
#define DWC3_GHWPARAMS6_EN_FPGA                 BIT(7)

/* Global HWPARAMS7 Register */
#define DWC3_GHWPARAMS7_RAM1_DEPTH(n)   ((n) & 0xffff)
#define DWC3_GHWPARAMS7_RAM2_DEPTH(n)   (((n) >> 16) & 0xffff)

/* Global Frame Length Adjustment Register */
#define DWC3_GFLADJ_30MHZ_SDBND_SEL             BIT(7)
#define DWC3_GFLADJ_30MHZ_MASK                  0x3f

/* Global User Control Register 2 */
#define DWC3_GUCTL2_RST_ACTBITLATER             BIT(14)

/* Device Configuration Register */
#define DWC3_DCFG_DEVADDR(addr) ((addr) << 3)
#define DWC3_DCFG_DEVADDR_MASK  DWC3_DCFG_DEVADDR(0x7f)

#define DWC3_DCFG_SPEED_MASK    (7 << 0)
#define DWC3_DCFG_SUPERSPEED_PLUS (5 << 0)  /* DWC_usb31 only */
#define DWC3_DCFG_SUPERSPEED    (4 << 0)
#define DWC3_DCFG_HIGHSPEED     (0 << 0)
#define DWC3_DCFG_FULLSPEED     BIT(0)
#define DWC3_DCFG_LOWSPEED      (2 << 0)

#define DWC3_DCFG_NUMP_SHIFT    17
#define DWC3_DCFG_NUMP(n)       (((n) >> DWC3_DCFG_NUMP_SHIFT) & 0x1f)
#define DWC3_DCFG_NUMP_MASK     (0x1f << DWC3_DCFG_NUMP_SHIFT)
#define DWC3_DCFG_LPM_CAP       BIT(22)

/* Device Control Register */
#define DWC3_DCTL_RUN_STOP      BIT(31)
#define DWC3_DCTL_CSFTRST       BIT(30)
#define DWC3_DCTL_LSFTRST       BIT(29)

#define DWC3_DCTL_HIRD_THRES_MASK       (0x1f << 24)
#define DWC3_DCTL_HIRD_THRES(n) ((n) << 24)

#define DWC3_DCTL_APPL1RES      BIT(23)

/* These apply for core versions 1.87a and earlier */
#define DWC3_DCTL_TRGTULST_MASK         (0x0f << 17)
#define DWC3_DCTL_TRGTULST(n)           ((n) << 17)
#define DWC3_DCTL_TRGTULST_U2           (DWC3_DCTL_TRGTULST(2))
#define DWC3_DCTL_TRGTULST_U3           (DWC3_DCTL_TRGTULST(3))
#define DWC3_DCTL_TRGTULST_SS_DIS       (DWC3_DCTL_TRGTULST(4))
#define DWC3_DCTL_TRGTULST_RX_DET       (DWC3_DCTL_TRGTULST(5))
#define DWC3_DCTL_TRGTULST_SS_INACT     (DWC3_DCTL_TRGTULST(6))

/* These apply for core versions 1.94a and later */
#define DWC3_DCTL_LPM_ERRATA_MASK       DWC3_DCTL_LPM_ERRATA(0xf)
#define DWC3_DCTL_LPM_ERRATA(n)         ((n) << 20)

#define DWC3_DCTL_KEEP_CONNECT          BIT(19)
#define DWC3_DCTL_L1_HIBER_EN           BIT(18)
#define DWC3_DCTL_CRS                   BIT(17)
#define DWC3_DCTL_CSS                   BIT(16)

#define DWC3_DCTL_INITU2ENA             BIT(12)
#define DWC3_DCTL_ACCEPTU2ENA           BIT(11)
#define DWC3_DCTL_INITU1ENA             BIT(10)
#define DWC3_DCTL_ACCEPTU1ENA           BIT(9)
#define DWC3_DCTL_TSTCTRL_MASK          (0xf << 1)

#define DWC3_DCTL_ULSTCHNGREQ_MASK      (0x0f << 5)
#define DWC3_DCTL_ULSTCHNGREQ(n) (((n) << 5) & DWC3_DCTL_ULSTCHNGREQ_MASK)

#define DWC3_DCTL_ULSTCHNG_NO_ACTION    (DWC3_DCTL_ULSTCHNGREQ(0))
#define DWC3_DCTL_ULSTCHNG_SS_DISABLED  (DWC3_DCTL_ULSTCHNGREQ(4))
#define DWC3_DCTL_ULSTCHNG_RX_DETECT    (DWC3_DCTL_ULSTCHNGREQ(5))
#define DWC3_DCTL_ULSTCHNG_SS_INACTIVE  (DWC3_DCTL_ULSTCHNGREQ(6))
#define DWC3_DCTL_ULSTCHNG_RECOVERY     (DWC3_DCTL_ULSTCHNGREQ(8))
#define DWC3_DCTL_ULSTCHNG_COMPLIANCE   (DWC3_DCTL_ULSTCHNGREQ(10))
#define DWC3_DCTL_ULSTCHNG_LOOPBACK     (DWC3_DCTL_ULSTCHNGREQ(11))

/* Device Event Enable Register */
#define DWC3_DEVTEN_VNDRDEVTSTRCVEDEN   BIT(12)
#define DWC3_DEVTEN_EVNTOVERFLOWEN      BIT(11)
#define DWC3_DEVTEN_CMDCMPLTEN          BIT(10)
#define DWC3_DEVTEN_ERRTICERREN         BIT(9)
#define DWC3_DEVTEN_SOFEN               BIT(7)
#define DWC3_DEVTEN_EOPFEN              BIT(6)
#define DWC3_DEVTEN_HIBERNATIONREQEVTEN BIT(5)
#define DWC3_DEVTEN_WKUPEVTEN           BIT(4)
#define DWC3_DEVTEN_ULSTCNGEN           BIT(3)
#define DWC3_DEVTEN_CONNECTDONEEN       BIT(2)
#define DWC3_DEVTEN_USBRSTEN            BIT(1)
#define DWC3_DEVTEN_DISCONNEVTEN        BIT(0)

/* Device Status Register */
#define DWC3_DSTS_DCNRD                 BIT(29)

/* This applies for core versions 1.87a and earlier */
#define DWC3_DSTS_PWRUPREQ              BIT(24)

/* These apply for core versions 1.94a and later */
#define DWC3_DSTS_RSS                   BIT(25)
#define DWC3_DSTS_SSS                   BIT(24)

#define DWC3_DSTS_COREIDLE              BIT(23)
#define DWC3_DSTS_DEVCTRLHLT            BIT(22)

#define DWC3_DSTS_USBLNKST_MASK         (0x0f << 18)
#define DWC3_DSTS_USBLNKST(n)           (((n) & DWC3_DSTS_USBLNKST_MASK) >> 18)

#define DWC3_DSTS_RXFIFOEMPTY           BIT(17)

#define DWC3_DSTS_SOFFN_MASK            (0x3fff << 3)
#define DWC3_DSTS_SOFFN(n)              (((n) & DWC3_DSTS_SOFFN_MASK) >> 3)

#define DWC3_DSTS_CONNECTSPD            (7 << 0)

#define DWC3_DSTS_SUPERSPEED_PLUS       (5 << 0) /* DWC_usb31 only */
#define DWC3_DSTS_SUPERSPEED            (4 << 0)
#define DWC3_DSTS_HIGHSPEED             (0 << 0)
#define DWC3_DSTS_FULLSPEED             BIT(0)
#define DWC3_DSTS_LOWSPEED              (2 << 0)

/* Device Generic Command Register */
#define DWC3_DGCMD_SET_LMP              0x01
#define DWC3_DGCMD_SET_PERIODIC_PAR     0x02
#define DWC3_DGCMD_XMIT_FUNCTION        0x03

/* These apply for core versions 1.94a and later */
#define DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO       0x04
#define DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI       0x05

#define DWC3_DGCMD_SELECTED_FIFO_FLUSH  0x09
#define DWC3_DGCMD_ALL_FIFO_FLUSH       0x0a
#define DWC3_DGCMD_SET_ENDPOINT_NRDY    0x0c
#define DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK 0x10

#define DWC3_DGCMD_STATUS(n)            (((n) >> 12) & 0x0F)
#define DWC3_DGCMD_CMDACT               BIT(10)
#define DWC3_DGCMD_CMDIOC               BIT(8)

/* Device Generic Command Parameter Register */
#define DWC3_DGCMDPAR_FORCE_LINKPM_ACCEPT       BIT(0)
#define DWC3_DGCMDPAR_FIFO_NUM(n)               ((n) << 0)
#define DWC3_DGCMDPAR_RX_FIFO                   (0 << 5)
#define DWC3_DGCMDPAR_TX_FIFO                   BIT(5)
#define DWC3_DGCMDPAR_LOOPBACK_DIS              (0 << 0)
#define DWC3_DGCMDPAR_LOOPBACK_ENA              BIT(0)

/* Device Endpoint Command Register */
#define DWC3_DEPCMD_PARAM_SHIFT         16
#define DWC3_DEPCMD_PARAM(x)            ((x) << DWC3_DEPCMD_PARAM_SHIFT)
#define DWC3_DEPCMD_GET_RSC_IDX(x)      (((x) >> DWC3_DEPCMD_PARAM_SHIFT) & 0x7f)
#define DWC3_DEPCMD_STATUS(x)           (((x) >> 12) & 0x0F)
#define DWC3_DEPCMD_HIPRI_FORCERM       BIT(11)
#define DWC3_DEPCMD_CLEARPENDIN         BIT(11)
#define DWC3_DEPCMD_CMDACT              BIT(10)
#define DWC3_DEPCMD_CMDIOC              BIT(8)

#define DWC3_DEPCMD_DEPSTARTCFG         (0x09 << 0)
#define DWC3_DEPCMD_ENDTRANSFER         (0x08 << 0)
#define DWC3_DEPCMD_UPDATETRANSFER      (0x07 << 0)
#define DWC3_DEPCMD_STARTTRANSFER       (0x06 << 0)
#define DWC3_DEPCMD_CLEARSTALL          (0x05 << 0)
#define DWC3_DEPCMD_SETSTALL            (0x04 << 0)
/* This applies for core versions 1.90a and earlier */
#define DWC3_DEPCMD_GETSEQNUMBER        (0x03 << 0)
/* This applies for core versions 1.94a and later */
#define DWC3_DEPCMD_GETEPSTATE          (0x03 << 0)
#define DWC3_DEPCMD_SETTRANSFRESOURCE   (0x02 << 0)
#define DWC3_DEPCMD_SETEPCONFIG         (0x01 << 0)

#define DWC3_DEPCMD_CMD(x)              ((x) & 0xf)

/* The EP number goes 0..31 so ep0 is always out and ep1 is always in */
#define DWC3_DALEPENA_EP(n)             BIT(n)

#define DWC3_DEPCMD_TYPE_CONTROL        0
#define DWC3_DEPCMD_TYPE_ISOC           1
#define DWC3_DEPCMD_TYPE_BULK           2
#define DWC3_DEPCMD_TYPE_INTR           3

#define DWC3_DEV_IMOD_COUNT_SHIFT       16
#define DWC3_DEV_IMOD_COUNT_MASK        (0xffff << 16)
#define DWC3_DEV_IMOD_INTERVAL_SHIFT    0
#define DWC3_DEV_IMOD_INTERVAL_MASK     (0xffff << 0)

/* OTG Configuration Register */
#define DWC3_OCFG_DISPWRCUTTOFF         BIT(5)
#define DWC3_OCFG_HIBDISMASK            BIT(4)
#define DWC3_OCFG_SFTRSTMASK            BIT(3)
#define DWC3_OCFG_OTGVERSION            BIT(2)
#define DWC3_OCFG_HNPCAP                BIT(1)
#define DWC3_OCFG_SRPCAP                BIT(0)

/* OTG CTL Register */
#define DWC3_OCTL_OTG3GOERR             BIT(7)
#define DWC3_OCTL_PERIMODE              BIT(6)
#define DWC3_OCTL_PRTPWRCTL             BIT(5)
#define DWC3_OCTL_HNPREQ                BIT(4)
#define DWC3_OCTL_SESREQ                BIT(3)
#define DWC3_OCTL_TERMSELIDPULSE        BIT(2)
#define DWC3_OCTL_DEVSETHNPEN           BIT(1)
#define DWC3_OCTL_HSTSETHNPEN           BIT(0)

/* OTG Event Register */
#define DWC3_OEVT_DEVICEMODE            BIT(31)
#define DWC3_OEVT_XHCIRUNSTPSET         BIT(27)
#define DWC3_OEVT_DEVRUNSTPSET          BIT(26)
#define DWC3_OEVT_HIBENTRY              BIT(25)
#define DWC3_OEVT_CONIDSTSCHNG          BIT(24)
#define DWC3_OEVT_HRRCONFNOTIF          BIT(23)
#define DWC3_OEVT_HRRINITNOTIF          BIT(22)
#define DWC3_OEVT_ADEVIDLE              BIT(21)
#define DWC3_OEVT_ADEVBHOSTEND          BIT(20)
#define DWC3_OEVT_ADEVHOST              BIT(19)
#define DWC3_OEVT_ADEVHNPCHNG           BIT(18)
#define DWC3_OEVT_ADEVSRPDET            BIT(17)
#define DWC3_OEVT_ADEVSESSENDDET        BIT(16)
#define DWC3_OEVT_BDEVBHOSTEND          BIT(11)
#define DWC3_OEVT_BDEVHNPCHNG           BIT(10)
#define DWC3_OEVT_BDEVSESSVLDDET        BIT(9)
#define DWC3_OEVT_BDEVVBUSCHNG          BIT(8)
#define DWC3_OEVT_BSESSVLD              BIT(3)
#define DWC3_OEVT_HSTNEGSTS             BIT(2)
#define DWC3_OEVT_SESREQSTS             BIT(1)
#define DWC3_OEVT_ERROR                 BIT(0)

/* OTG Event Enable Register */
#define DWC3_OEVTEN_XHCIRUNSTPSETEN     BIT(27)
#define DWC3_OEVTEN_DEVRUNSTPSETEN      BIT(26)
#define DWC3_OEVTEN_HIBENTRYEN          BIT(25)
#define DWC3_OEVTEN_CONIDSTSCHNGEN      BIT(24)
#define DWC3_OEVTEN_HRRCONFNOTIFEN      BIT(23)
#define DWC3_OEVTEN_HRRINITNOTIFEN      BIT(22)
#define DWC3_OEVTEN_ADEVIDLEEN          BIT(21)
#define DWC3_OEVTEN_ADEVBHOSTENDEN      BIT(20)
#define DWC3_OEVTEN_ADEVHOSTEN          BIT(19)
#define DWC3_OEVTEN_ADEVHNPCHNGEN       BIT(18)
#define DWC3_OEVTEN_ADEVSRPDETEN        BIT(17)
#define DWC3_OEVTEN_ADEVSESSENDDETEN    BIT(16)
#define DWC3_OEVTEN_BDEVBHOSTENDEN      BIT(11)
#define DWC3_OEVTEN_BDEVHNPCHNGEN       BIT(10)
#define DWC3_OEVTEN_BDEVSESSVLDDETEN    BIT(9)
#define DWC3_OEVTEN_BDEVVBUSCHNGEN      BIT(8)

/* OTG Status Register */
#define DWC3_OSTS_DEVRUNSTP             BIT(13)
#define DWC3_OSTS_XHCIRUNSTP            BIT(12)
#define DWC3_OSTS_PERIPHERALSTATE       BIT(4)
#define DWC3_OSTS_XHCIPRTPOWER          BIT(3)
#define DWC3_OSTS_BSESVLD               BIT(2)
#define DWC3_OSTS_VBUSVLD               BIT(1)
#define DWC3_OSTS_CONIDSTS              BIT(0)

/* Structures */

struct dwc3_trb;

/**
 * struct dwc3_event_buffer - Software event buffer representation
 * @buf: _THE_ buffer
 * @cache: The buffer cache used in the threaded interrupt
 * @length: size of this buffer
 * @lpos: event offset
 * @count: cache of last read event count register
 * @flags: flags related to this event buffer
 * @dma: dma_addr_t
 * @dwc: pointer to DWC controller
 */
struct dwc3_event_buffer {
        void                    *buf;
        void                    *cache;
        unsigned                length;
        unsigned int            lpos;
        unsigned int            count;
        unsigned int            flags;

#define DWC3_EVENT_PENDING      BIT(0)

        dma_addr_t              dma;

        struct dwc3             *dwc;
};

#define DWC3_EP_FLAG_STALLED    BIT(0)
#define DWC3_EP_FLAG_WEDGED     BIT(1)

#define DWC3_EP_DIRECTION_TX    true
#define DWC3_EP_DIRECTION_RX    false

#define DWC3_TRB_NUM            256

/**
 * struct dwc3_ep - device side endpoint representation
 * @endpoint: usb endpoint
 * @pending_list: list of pending requests for this endpoint
 * @started_list: list of started requests on this endpoint
 * @wait_end_transfer: wait_queue_head_t for waiting on End Transfer complete
 * @lock: spinlock for endpoint request queue traversal
 * @regs: pointer to first endpoint register
 * @trb_pool: array of transaction buffers
 * @trb_pool_dma: dma address of @trb_pool
 * @trb_enqueue: enqueue 'pointer' into TRB array
 * @trb_dequeue: dequeue 'pointer' into TRB array
 * @dwc: pointer to DWC controller
 * @saved_state: ep state saved during hibernation
 * @flags: endpoint flags (wedged, stalled, ...)
 * @number: endpoint number (1 - 15)
 * @type: set to bmAttributes & USB_ENDPOINT_XFERTYPE_MASK
 * @resource_index: Resource transfer index
 * @frame_number: set to the frame number we want this transfer to start (ISOC)
 * @interval: the interval on which the ISOC transfer is started
 * @name: a human readable name e.g. ep1out-bulk
 * @direction: true for TX, false for RX
 * @stream_capable: true when streams are enabled
 */
struct dwc3_ep {
        struct usb_ep           endpoint;
        struct list_head        pending_list;
        struct list_head        started_list;

        wait_queue_head_t       wait_end_transfer;

        spinlock_t              lock;
        void __iomem            *regs;

        struct dwc3_trb         *trb_pool;
        dma_addr_t              trb_pool_dma;
        struct dwc3             *dwc;

        u32                     saved_state;
        unsigned                flags;
#define DWC3_EP_ENABLED         BIT(0)
#define DWC3_EP_STALL           BIT(1)
#define DWC3_EP_WEDGE           BIT(2)
#define DWC3_EP_TRANSFER_STARTED BIT(3)
#define DWC3_EP_PENDING_REQUEST BIT(5)
#define DWC3_EP_END_TRANSFER_PENDING    BIT(7)

        /* This last one is specific to EP0 */
#define DWC3_EP0_DIR_IN         BIT(31)

        /*
         * IMPORTANT: we *know* we have 256 TRBs in our @trb_pool, so we will
         * use a u8 type here. If anybody decides to increase number of TRBs to
         * anything larger than 256 - I can't see why people would want to do
         * this though - then this type needs to be changed.
         *
         * By using u8 types we ensure that our % operator when incrementing
         * enqueue and dequeue get optimized away by the compiler.
         */
        u8                      trb_enqueue;
        u8                      trb_dequeue;

        u8                      number;
        u8                      type;
        u8                      resource_index;
        u32                     frame_number;
        u32                     interval;

        char                    name[20];

        unsigned                direction:1;
        unsigned                stream_capable:1;
};

enum dwc3_phy {
        DWC3_PHY_UNKNOWN = 0,
        DWC3_PHY_USB3,
        DWC3_PHY_USB2,
};

enum dwc3_ep0_next {
        DWC3_EP0_UNKNOWN = 0,
        DWC3_EP0_COMPLETE,
        DWC3_EP0_NRDY_DATA,
        DWC3_EP0_NRDY_STATUS,
};

enum dwc3_ep0_state {
        EP0_UNCONNECTED         = 0,
        EP0_SETUP_PHASE,
        EP0_DATA_PHASE,
        EP0_STATUS_PHASE,
};

enum dwc3_link_state {
        /* In SuperSpeed */
        DWC3_LINK_STATE_U0              = 0x00, /* in HS, means ON */
        DWC3_LINK_STATE_U1              = 0x01,
        DWC3_LINK_STATE_U2              = 0x02, /* in HS, means SLEEP */
        DWC3_LINK_STATE_U3              = 0x03, /* in HS, means SUSPEND */
        DWC3_LINK_STATE_SS_DIS          = 0x04,
        DWC3_LINK_STATE_RX_DET          = 0x05, /* in HS, means Early Suspend */
        DWC3_LINK_STATE_SS_INACT        = 0x06,
        DWC3_LINK_STATE_POLL            = 0x07,
        DWC3_LINK_STATE_RECOV           = 0x08,
        DWC3_LINK_STATE_HRESET          = 0x09,
        DWC3_LINK_STATE_CMPLY           = 0x0a,
        DWC3_LINK_STATE_LPBK            = 0x0b,
        DWC3_LINK_STATE_RESET           = 0x0e,
        DWC3_LINK_STATE_RESUME          = 0x0f,
        DWC3_LINK_STATE_MASK            = 0x0f,
};

/* TRB Length, PCM and Status */
#define DWC3_TRB_SIZE_MASK      (0x00ffffff)
#define DWC3_TRB_SIZE_LENGTH(n) ((n) & DWC3_TRB_SIZE_MASK)
#define DWC3_TRB_SIZE_PCM1(n)   (((n) & 0x03) << 24)
#define DWC3_TRB_SIZE_TRBSTS(n) (((n) & (0x0f << 28)) >> 28)

#define DWC3_TRBSTS_OK                  0
#define DWC3_TRBSTS_MISSED_ISOC         1
#define DWC3_TRBSTS_SETUP_PENDING       2
#define DWC3_TRB_STS_XFER_IN_PROG       4

/* TRB Control */
#define DWC3_TRB_CTRL_HWO               BIT(0)
#define DWC3_TRB_CTRL_LST               BIT(1)
#define DWC3_TRB_CTRL_CHN               BIT(2)
#define DWC3_TRB_CTRL_CSP               BIT(3)
#define DWC3_TRB_CTRL_TRBCTL(n)         (((n) & 0x3f) << 4)
#define DWC3_TRB_CTRL_ISP_IMI           BIT(10)
#define DWC3_TRB_CTRL_IOC               BIT(11)
#define DWC3_TRB_CTRL_SID_SOFN(n)       (((n) & 0xffff) << 14)

#define DWC3_TRBCTL_TYPE(n)             ((n) & (0x3f << 4))
#define DWC3_TRBCTL_NORMAL              DWC3_TRB_CTRL_TRBCTL(1)
#define DWC3_TRBCTL_CONTROL_SETUP       DWC3_TRB_CTRL_TRBCTL(2)
#define DWC3_TRBCTL_CONTROL_STATUS2     DWC3_TRB_CTRL_TRBCTL(3)
#define DWC3_TRBCTL_CONTROL_STATUS3     DWC3_TRB_CTRL_TRBCTL(4)
#define DWC3_TRBCTL_CONTROL_DATA        DWC3_TRB_CTRL_TRBCTL(5)
#define DWC3_TRBCTL_ISOCHRONOUS_FIRST   DWC3_TRB_CTRL_TRBCTL(6)
#define DWC3_TRBCTL_ISOCHRONOUS         DWC3_TRB_CTRL_TRBCTL(7)
#define DWC3_TRBCTL_LINK_TRB            DWC3_TRB_CTRL_TRBCTL(8)

/**
 * struct dwc3_trb - transfer request block (hw format)
 * @bpl: DW0-3
 * @bph: DW4-7
 * @size: DW8-B
 * @ctrl: DWC-F
 */
struct dwc3_trb {
        u32             bpl;
        u32             bph;
        u32             size;
        u32             ctrl;
} __packed;

/**
 * struct dwc3_hwparams - copy of HWPARAMS registers
 * @hwparams0: GHWPARAMS0
 * @hwparams1: GHWPARAMS1
 * @hwparams2: GHWPARAMS2
 * @hwparams3: GHWPARAMS3
 * @hwparams4: GHWPARAMS4
 * @hwparams5: GHWPARAMS5
 * @hwparams6: GHWPARAMS6
 * @hwparams7: GHWPARAMS7
 * @hwparams8: GHWPARAMS8
 */
struct dwc3_hwparams {
        u32     hwparams0;
        u32     hwparams1;
        u32     hwparams2;
        u32     hwparams3;
        u32     hwparams4;
        u32     hwparams5;
        u32     hwparams6;
        u32     hwparams7;
        u32     hwparams8;
};

/* HWPARAMS0 */
#define DWC3_MODE(n)            ((n) & 0x7)

#define DWC3_MDWIDTH(n)         (((n) & 0xff00) >> 8)

/* HWPARAMS1 */
#define DWC3_NUM_INT(n)         (((n) & (0x3f << 15)) >> 15)

/* HWPARAMS3 */
#define DWC3_NUM_IN_EPS_MASK    (0x1f << 18)
#define DWC3_NUM_EPS_MASK       (0x3f << 12)
#define DWC3_NUM_EPS(p)         (((p)->hwparams3 &              \
                        (DWC3_NUM_EPS_MASK)) >> 12)
#define DWC3_NUM_IN_EPS(p)      (((p)->hwparams3 &              \
                        (DWC3_NUM_IN_EPS_MASK)) >> 18)

/* HWPARAMS7 */
#define DWC3_RAM1_DEPTH(n)      ((n) & 0xffff)

/**
 * struct dwc3_request - representation of a transfer request
 * @request: struct usb_request to be transferred
 * @list: a list_head used for request queueing
 * @dep: struct dwc3_ep owning this request
 * @sg: pointer to first incomplete sg
 * @start_sg: pointer to the sg which should be queued next
 * @num_pending_sgs: counter to pending sgs
 * @num_queued_sgs: counter to the number of sgs which already got queued
 * @remaining: amount of data remaining
 * @epnum: endpoint number to which this request refers
 * @trb: pointer to struct dwc3_trb
 * @trb_dma: DMA address of @trb
 * @unaligned: true for OUT endpoints with length not divisible by maxp
 * @direction: IN or OUT direction flag
 * @mapped: true when request has been dma-mapped
 * @started: request is started
 * @zero: wants a ZLP
 */
struct dwc3_request {
        struct usb_request      request;
        struct list_head        list;
        struct dwc3_ep          *dep;
        struct scatterlist      *sg;
        struct scatterlist      *start_sg;

        unsigned                num_pending_sgs;
        unsigned int            num_queued_sgs;
        unsigned                remaining;
        u8                      epnum;
        struct dwc3_trb         *trb;
        dma_addr_t              trb_dma;

        unsigned                unaligned:1;
        unsigned                direction:1;
        unsigned                mapped:1;
        unsigned                started:1;
        unsigned                zero:1;
};

/*
 * struct dwc3_scratchpad_array - hibernation scratchpad array
 * (format defined by hw)
 */
struct dwc3_scratchpad_array {
        __le64  dma_adr[DWC3_MAX_HIBER_SCRATCHBUFS];
};

/**
 * struct dwc3 - representation of our controller
 * @drd_work: workqueue used for role swapping
 * @ep0_trb: trb which is used for the ctrl_req
 * @bounce: address of bounce buffer
 * @scratchbuf: address of scratch buffer
 * @setup_buf: used while precessing STD USB requests
 * @ep0_trb_addr: dma address of @ep0_trb
 * @bounce_addr: dma address of @bounce
 * @ep0_usb_req: dummy req used while handling STD USB requests
 * @scratch_addr: dma address of scratchbuf
 * @ep0_in_setup: one control transfer is completed and enter setup phase
 * @lock: for synchronizing
 * @dev: pointer to our struct device
 * @sysdev: pointer to the DMA-capable device
 * @xhci: pointer to our xHCI child
 * @xhci_resources: struct resources for our @xhci child
 * @ev_buf: struct dwc3_event_buffer pointer
 * @eps: endpoint array
 * @gadget: device side representation of the peripheral controller
 * @gadget_driver: pointer to the gadget driver
 * @clks: array of clocks
 * @num_clks: number of clocks
 * @reset: reset control
 * @regs: base address for our registers
 * @regs_size: address space size
 * @fladj: frame length adjustment
 * @irq_gadget: peripheral controller's IRQ number
 * @otg_irq: IRQ number for OTG IRQs
 * @current_otg_role: current role of operation while using the OTG block
 * @desired_otg_role: desired role of operation while using the OTG block
 * @otg_restart_host: flag that OTG controller needs to restart host
 * @nr_scratch: number of scratch buffers
 * @u1u2: only used on revisions <1.83a for workaround
 * @maximum_speed: maximum speed requested (mainly for testing purposes)
 * @revision: revision register contents
 * @dr_mode: requested mode of operation
 * @current_dr_role: current role of operation when in dual-role mode
 * @desired_dr_role: desired role of operation when in dual-role mode
 * @edev: extcon handle
 * @edev_nb: extcon notifier
 * @hsphy_mode: UTMI phy mode, one of following:
 *              - USBPHY_INTERFACE_MODE_UTMI
 *              - USBPHY_INTERFACE_MODE_UTMIW
 * @usb2_phy: pointer to USB2 PHY
 * @usb3_phy: pointer to USB3 PHY
 * @usb2_generic_phy: pointer to USB2 PHY
 * @usb3_generic_phy: pointer to USB3 PHY
 * @phys_ready: flag to indicate that PHYs are ready
 * @ulpi: pointer to ulpi interface
 * @ulpi_ready: flag to indicate that ULPI is initialized
 * @u2sel: parameter from Set SEL request.
 * @u2pel: parameter from Set SEL request.
 * @u1sel: parameter from Set SEL request.
 * @u1pel: parameter from Set SEL request.
 * @num_eps: number of endpoints
 * @ep0_next_event: hold the next expected event
 * @ep0state: state of endpoint zero
 * @link_state: link state
 * @speed: device speed (super, high, full, low)
 * @hwparams: copy of hwparams registers
 * @root: debugfs root folder pointer
 * @regset: debugfs pointer to regdump file
 * @test_mode: true when we're entering a USB test mode
 * @test_mode_nr: test feature selector
 * @lpm_nyet_threshold: LPM NYET response threshold
 * @hird_threshold: HIRD threshold
 * @rx_thr_num_pkt_prd: periodic ESS receive packet count
 * @rx_max_burst_prd: max periodic ESS receive burst size
 * @tx_thr_num_pkt_prd: periodic ESS transmit packet count
 * @tx_max_burst_prd: max periodic ESS transmit burst size
 * @hsphy_interface: "utmi" or "ulpi"
 * @connected: true when we're connected to a host, false otherwise
 * @delayed_status: true when gadget driver asks for delayed status
 * @ep0_bounced: true when we used bounce buffer
 * @ep0_expect_in: true when we expect a DATA IN transfer
 * @has_hibernation: true when dwc3 was configured with Hibernation
 * @sysdev_is_parent: true when dwc3 device has a parent driver
 * @has_lpm_erratum: true when core was configured with LPM Erratum. Note that
 *                      there's now way for software to detect this in runtime.
 * @is_utmi_l1_suspend: the core asserts output signal
 *      0       - utmi_sleep_n
 *      1       - utmi_l1_suspend_n
 * @is_fpga: true when we are using the FPGA board
 * @pending_events: true when we have pending IRQs to be handled
 * @pullups_connected: true when Run/Stop bit is set
 * @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
 * @three_stage_setup: set if we perform a three phase setup
 * @usb3_lpm_capable: set if hadrware supports Link Power Management
 * @disable_scramble_quirk: set if we enable the disable scramble quirk
 * @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
 * @u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
 * @req_p1p2p3_quirk: set if we enable request p1p2p3 quirk
 * @del_p1p2p3_quirk: set if we enable delay p1p2p3 quirk
 * @del_phy_power_chg_quirk: set if we enable delay phy power change quirk
 * @lfps_filter_quirk: set if we enable LFPS filter quirk
 * @rx_detect_poll_quirk: set if we enable rx_detect to polling lfps quirk
 * @dis_u3_susphy_quirk: set if we disable usb3 suspend phy
 * @dis_u2_susphy_quirk: set if we disable usb2 suspend phy
 * @dis_enblslpm_quirk: set if we clear enblslpm in GUSB2PHYCFG,
 *                      disabling the suspend signal to the PHY.
 * @dis_rxdet_inp3_quirk: set if we disable Rx.Detect in P3
 * @dis_u2_freeclk_exists_quirk : set if we clear u2_freeclk_exists
 *                      in GUSB2PHYCFG, specify that USB2 PHY doesn't
 *                      provide a free-running PHY clock.
 * @dis_del_phy_power_chg_quirk: set if we disable delay phy power
 *                      change quirk.
 * @dis_tx_ipgap_linecheck_quirk: set if we disable u2mac linestate
 *                      check during HS transmit.
 * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
 * @tx_de_emphasis: Tx de-emphasis value
 *      0       - -6dB de-emphasis
 *      1       - -3.5dB de-emphasis
 *      2       - No de-emphasis
 *      3       - Reserved
 * @dis_metastability_quirk: set to disable metastability quirk.
 * @imod_interval: set the interrupt moderation interval in 250ns
 *                 increments or 0 to disable.
 */
struct dwc3 {
        struct work_struct      drd_work;
        struct dwc3_trb         *ep0_trb;
        void                    *bounce;
        void                    *scratchbuf;
        u8                      *setup_buf;
        dma_addr_t              ep0_trb_addr;
        dma_addr_t              bounce_addr;
        dma_addr_t              scratch_addr;
        struct dwc3_request     ep0_usb_req;
        struct completion       ep0_in_setup;

        /* device lock */
        spinlock_t              lock;

        struct device           *dev;
        struct device           *sysdev;

        struct platform_device  *xhci;
        struct resource         xhci_resources[DWC3_XHCI_RESOURCES_NUM];

        struct dwc3_event_buffer *ev_buf;
        struct dwc3_ep          *eps[DWC3_ENDPOINTS_NUM];

        struct usb_gadget       gadget;
        struct usb_gadget_driver *gadget_driver;

        struct clk_bulk_data    *clks;
        int                     num_clks;

        struct reset_control    *reset;

        struct usb_phy          *usb2_phy;
        struct usb_phy          *usb3_phy;

        struct phy              *usb2_generic_phy;
        struct phy              *usb3_generic_phy;

        bool                    phys_ready;

        struct ulpi             *ulpi;
        bool                    ulpi_ready;

        void __iomem            *regs;
        size_t                  regs_size;

        enum usb_dr_mode        dr_mode;
        u32                     current_dr_role;
        u32                     desired_dr_role;
        struct extcon_dev       *edev;
        struct notifier_block   edev_nb;
        enum usb_phy_interface  hsphy_mode;

        u32                     fladj;
        u32                     irq_gadget;
        u32                     otg_irq;
        u32                     current_otg_role;
        u32                     desired_otg_role;
        bool                    otg_restart_host;
        u32                     nr_scratch;
        u32                     u1u2;
        u32                     maximum_speed;

        /*
         * All 3.1 IP version constants are greater than the 3.0 IP
         * version constants. This works for most version checks in
         * dwc3. However, in the future, this may not apply as
         * features may be developed on newer versions of the 3.0 IP
         * that are not in the 3.1 IP.
         */
        u32                     revision;

#define DWC3_REVISION_173A      0x5533173a
#define DWC3_REVISION_175A      0x5533175a
#define DWC3_REVISION_180A      0x5533180a
#define DWC3_REVISION_183A      0x5533183a
#define DWC3_REVISION_185A      0x5533185a
#define DWC3_REVISION_187A      0x5533187a
#define DWC3_REVISION_188A      0x5533188a
#define DWC3_REVISION_190A      0x5533190a
#define DWC3_REVISION_194A      0x5533194a
#define DWC3_REVISION_200A      0x5533200a
#define DWC3_REVISION_202A      0x5533202a
#define DWC3_REVISION_210A      0x5533210a
#define DWC3_REVISION_220A      0x5533220a
#define DWC3_REVISION_230A      0x5533230a
#define DWC3_REVISION_240A      0x5533240a
#define DWC3_REVISION_250A      0x5533250a
#define DWC3_REVISION_260A      0x5533260a
#define DWC3_REVISION_270A      0x5533270a
#define DWC3_REVISION_280A      0x5533280a
#define DWC3_REVISION_290A      0x5533290a
#define DWC3_REVISION_300A      0x5533300a
#define DWC3_REVISION_310A      0x5533310a

/*
 * NOTICE: we're using bit 31 as a "is usb 3.1" flag. This is really
 * just so dwc31 revisions are always larger than dwc3.
 */
#define DWC3_REVISION_IS_DWC31          0x80000000
#define DWC3_USB31_REVISION_110A        (0x3131302a | DWC3_REVISION_IS_DWC31)
#define DWC3_USB31_REVISION_120A        (0x3132302a | DWC3_REVISION_IS_DWC31)

        enum dwc3_ep0_next      ep0_next_event;
        enum dwc3_ep0_state     ep0state;
        enum dwc3_link_state    link_state;

        u16                     u2sel;
        u16                     u2pel;
        u8                      u1sel;
        u8                      u1pel;

        u8                      speed;

        u8                      num_eps;

        struct dwc3_hwparams    hwparams;
        struct dentry           *root;
        struct debugfs_regset32 *regset;

        u8                      test_mode;
        u8                      test_mode_nr;
        u8                      lpm_nyet_threshold;
        u8                      hird_threshold;
        u8                      rx_thr_num_pkt_prd;
        u8                      rx_max_burst_prd;
        u8                      tx_thr_num_pkt_prd;
        u8                      tx_max_burst_prd;

        const char              *hsphy_interface;

        unsigned                connected:1;
        unsigned                delayed_status:1;
        unsigned                ep0_bounced:1;
        unsigned                ep0_expect_in:1;
        unsigned                has_hibernation:1;
        unsigned                sysdev_is_parent:1;
        unsigned                has_lpm_erratum:1;
        unsigned                is_utmi_l1_suspend:1;
        unsigned                is_fpga:1;
        unsigned                pending_events:1;
        unsigned                pullups_connected:1;
        unsigned                setup_packet_pending:1;
        unsigned                three_stage_setup:1;
        unsigned                usb3_lpm_capable:1;

        unsigned                disable_scramble_quirk:1;
        unsigned                u2exit_lfps_quirk:1;
        unsigned                u2ss_inp3_quirk:1;
        unsigned                req_p1p2p3_quirk:1;
        unsigned                del_p1p2p3_quirk:1;
        unsigned                del_phy_power_chg_quirk:1;
        unsigned                lfps_filter_quirk:1;
        unsigned                rx_detect_poll_quirk:1;
        unsigned                dis_u3_susphy_quirk:1;
        unsigned                dis_u2_susphy_quirk:1;
        unsigned                dis_enblslpm_quirk:1;
        unsigned                dis_rxdet_inp3_quirk:1;
        unsigned                dis_u2_freeclk_exists_quirk:1;
        unsigned                dis_del_phy_power_chg_quirk:1;
        unsigned                dis_tx_ipgap_linecheck_quirk:1;

        unsigned                tx_de_emphasis_quirk:1;
        unsigned                tx_de_emphasis:2;

        unsigned                dis_metastability_quirk:1;

        u16                     imod_interval;
};

#define work_to_dwc(w)          (container_of((w), struct dwc3, drd_work))

/* -------------------------------------------------------------------------- */

struct dwc3_event_type {
        u32     is_devspec:1;
        u32     type:7;
        u32     reserved8_31:24;
} __packed;

#define DWC3_DEPEVT_XFERCOMPLETE        0x01
#define DWC3_DEPEVT_XFERINPROGRESS      0x02
#define DWC3_DEPEVT_XFERNOTREADY        0x03
#define DWC3_DEPEVT_RXTXFIFOEVT         0x04
#define DWC3_DEPEVT_STREAMEVT           0x06
#define DWC3_DEPEVT_EPCMDCMPLT          0x07

/**
 * struct dwc3_event_depvt - Device Endpoint Events
 * @one_bit: indicates this is an endpoint event (not used)
 * @endpoint_number: number of the endpoint
 * @endpoint_event: The event we have:
 *      0x00    - Reserved
 *      0x01    - XferComplete
 *      0x02    - XferInProgress
 *      0x03    - XferNotReady
 *      0x04    - RxTxFifoEvt (IN->Underrun, OUT->Overrun)
 *      0x05    - Reserved
 *      0x06    - StreamEvt
 *      0x07    - EPCmdCmplt
 * @reserved11_10: Reserved, don't use.
 * @status: Indicates the status of the event. Refer to databook for
 *      more information.
 * @parameters: Parameters of the current event. Refer to databook for
 *      more information.
 */
struct dwc3_event_depevt {
        u32     one_bit:1;
        u32     endpoint_number:5;
        u32     endpoint_event:4;
        u32     reserved11_10:2;
        u32     status:4;

/* Within XferNotReady */
#define DEPEVT_STATUS_TRANSFER_ACTIVE   BIT(3)

/* Within XferComplete or XferInProgress */
#define DEPEVT_STATUS_BUSERR    BIT(0)
#define DEPEVT_STATUS_SHORT     BIT(1)
#define DEPEVT_STATUS_IOC       BIT(2)
#define DEPEVT_STATUS_LST       BIT(3) /* XferComplete */
#define DEPEVT_STATUS_MISSED_ISOC BIT(3) /* XferInProgress */

/* Stream event only */
#define DEPEVT_STREAMEVT_FOUND          1
#define DEPEVT_STREAMEVT_NOTFOUND       2

/* Control-only Status */
#define DEPEVT_STATUS_CONTROL_DATA      1
#define DEPEVT_STATUS_CONTROL_STATUS    2
#define DEPEVT_STATUS_CONTROL_PHASE(n)  ((n) & 3)

/* In response to Start Transfer */
#define DEPEVT_TRANSFER_NO_RESOURCE     1
#define DEPEVT_TRANSFER_BUS_EXPIRY      2

        u32     parameters:16;

/* For Command Complete Events */
#define DEPEVT_PARAMETER_CMD(n) (((n) & (0xf << 8)) >> 8)
} __packed;

/**
 * struct dwc3_event_devt - Device Events
 * @one_bit: indicates this is a non-endpoint event (not used)
 * @device_event: indicates it's a device event. Should read as 0x00
 * @type: indicates the type of device event.
 *      0       - DisconnEvt
 *      1       - USBRst
 *      2       - ConnectDone
 *      3       - ULStChng
 *      4       - WkUpEvt
 *      5       - Reserved
 *      6       - EOPF
 *      7       - SOF
 *      8       - Reserved
 *      9       - ErrticErr
 *      10      - CmdCmplt
 *      11      - EvntOverflow
 *      12      - VndrDevTstRcved
 * @reserved15_12: Reserved, not used
 * @event_info: Information about this event
 * @reserved31_25: Reserved, not used
 */
struct dwc3_event_devt {
        u32     one_bit:1;
        u32     device_event:7;
        u32     type:4;
        u32     reserved15_12:4;
        u32     event_info:9;
        u32     reserved31_25:7;
} __packed;

/**
 * struct dwc3_event_gevt - Other Core Events
 * @one_bit: indicates this is a non-endpoint event (not used)
 * @device_event: indicates it's (0x03) Carkit or (0x04) I2C event.
 * @phy_port_number: self-explanatory
 * @reserved31_12: Reserved, not used.
 */
struct dwc3_event_gevt {
        u32     one_bit:1;
        u32     device_event:7;
        u32     phy_port_number:4;
        u32     reserved31_12:20;
} __packed;

/**
 * union dwc3_event - representation of Event Buffer contents
 * @raw: raw 32-bit event
 * @type: the type of the event
 * @depevt: Device Endpoint Event
 * @devt: Device Event
 * @gevt: Global Event
 */
union dwc3_event {
        u32                             raw;
        struct dwc3_event_type          type;
        struct dwc3_event_depevt        depevt;
        struct dwc3_event_devt          devt;
        struct dwc3_event_gevt          gevt;
};

/**
 * struct dwc3_gadget_ep_cmd_params - representation of endpoint command
 * parameters
 * @param2: third parameter
 * @param1: second parameter
 * @param0: first parameter
 */
struct dwc3_gadget_ep_cmd_params {
        u32     param2;
        u32     param1;
        u32     param0;
};

/*
 * DWC3 Features to be used as Driver Data
 */

#define DWC3_HAS_PERIPHERAL             BIT(0)
#define DWC3_HAS_XHCI                   BIT(1)
#define DWC3_HAS_OTG                    BIT(3)

/* prototypes */
void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode);
void dwc3_set_mode(struct dwc3 *dwc, u32 mode);
u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type);

/* check whether we are on the DWC_usb3 core */
static inline bool dwc3_is_usb3(struct dwc3 *dwc)
{
        return !(dwc->revision & DWC3_REVISION_IS_DWC31);
}

/* check whether we are on the DWC_usb31 core */
static inline bool dwc3_is_usb31(struct dwc3 *dwc)
{
        return !!(dwc->revision & DWC3_REVISION_IS_DWC31);
}

bool dwc3_has_imod(struct dwc3 *dwc);

int dwc3_event_buffers_setup(struct dwc3 *dwc);
void dwc3_event_buffers_cleanup(struct dwc3 *dwc);

#if IS_ENABLED(CONFIG_USB_DWC3_HOST) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
int dwc3_host_init(struct dwc3 *dwc);
void dwc3_host_exit(struct dwc3 *dwc);
#else
static inline int dwc3_host_init(struct dwc3 *dwc)
{ return 0; }
static inline void dwc3_host_exit(struct dwc3 *dwc)
{ }
#endif

#if IS_ENABLED(CONFIG_USB_DWC3_GADGET) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
int dwc3_gadget_init(struct dwc3 *dwc);
void dwc3_gadget_exit(struct dwc3 *dwc);
int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode);
int dwc3_gadget_get_link_state(struct dwc3 *dwc);
int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state);
int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
                struct dwc3_gadget_ep_cmd_params *params);
int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param);
#else
static inline int dwc3_gadget_init(struct dwc3 *dwc)
{ return 0; }
static inline void dwc3_gadget_exit(struct dwc3 *dwc)
{ }
static inline int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
{ return 0; }
static inline int dwc3_gadget_get_link_state(struct dwc3 *dwc)
{ return 0; }
static inline int dwc3_gadget_set_link_state(struct dwc3 *dwc,
                enum dwc3_link_state state)
{ return 0; }

static inline int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
                struct dwc3_gadget_ep_cmd_params *params)
{ return 0; }
static inline int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
                int cmd, u32 param)
{ return 0; }
#endif

#if IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
int dwc3_drd_init(struct dwc3 *dwc);
void dwc3_drd_exit(struct dwc3 *dwc);
void dwc3_otg_init(struct dwc3 *dwc);
void dwc3_otg_exit(struct dwc3 *dwc);
void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus);
void dwc3_otg_host_init(struct dwc3 *dwc);
#else
static inline int dwc3_drd_init(struct dwc3 *dwc)
{ return 0; }
static inline void dwc3_drd_exit(struct dwc3 *dwc)
{ }
static inline void dwc3_otg_init(struct dwc3 *dwc)
{ }
static inline void dwc3_otg_exit(struct dwc3 *dwc)
{ }
static inline void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
{ }
static inline void dwc3_otg_host_init(struct dwc3 *dwc)
{ }
#endif

/* power management interface */
#if !IS_ENABLED(CONFIG_USB_DWC3_HOST)
int dwc3_gadget_suspend(struct dwc3 *dwc);
int dwc3_gadget_resume(struct dwc3 *dwc);
void dwc3_gadget_process_pending_events(struct dwc3 *dwc);
#else
static inline int dwc3_gadget_suspend(struct dwc3 *dwc)
{
        return 0;
}

static inline int dwc3_gadget_resume(struct dwc3 *dwc)
{
        return 0;
}

static inline void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
{
}
#endif /* !IS_ENABLED(CONFIG_USB_DWC3_HOST) */

#if IS_ENABLED(CONFIG_USB_DWC3_ULPI)
int dwc3_ulpi_init(struct dwc3 *dwc);
void dwc3_ulpi_exit(struct dwc3 *dwc);
#else
static inline int dwc3_ulpi_init(struct dwc3 *dwc)
{ return 0; }
static inline void dwc3_ulpi_exit(struct dwc3 *dwc)
{ }
#endif

#endif /* __DRIVERS_USB_DWC3_CORE_H */