/*
 * Renesas USB3.0 Peripheral driver (USB gadget)
 *
 * Copyright (C) 2015  Renesas Electronics Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

/* register definitions */
#define USB3_AXI_INT_STA        0x008
#define USB3_AXI_INT_ENA        0x00c
#define USB3_DMA_INT_STA        0x010
#define USB3_DMA_INT_ENA        0x014
#define USB3_DMA_CH0_CON(n)     (0x030 + ((n) - 1) * 0x10) /* n = 1 to 4 */
#define USB3_DMA_CH0_PRD_ADR(n) (0x034 + ((n) - 1) * 0x10) /* n = 1 to 4 */
#define USB3_USB_COM_CON        0x200
#define USB3_USB20_CON          0x204
#define USB3_USB30_CON          0x208
#define USB3_USB_STA            0x210
#define USB3_DRD_CON            0x218
#define USB3_USB_INT_STA_1      0x220
#define USB3_USB_INT_STA_2      0x224
#define USB3_USB_INT_ENA_1      0x228
#define USB3_USB_INT_ENA_2      0x22c
#define USB3_STUP_DAT_0         0x230
#define USB3_STUP_DAT_1         0x234
#define USB3_USB_OTG_STA        0x268
#define USB3_USB_OTG_INT_STA    0x26c
#define USB3_USB_OTG_INT_ENA    0x270
#define USB3_P0_MOD             0x280
#define USB3_P0_CON             0x288
#define USB3_P0_STA             0x28c
#define USB3_P0_INT_STA         0x290
#define USB3_P0_INT_ENA         0x294
#define USB3_P0_LNG             0x2a0
#define USB3_P0_READ            0x2a4
#define USB3_P0_WRITE           0x2a8
#define USB3_PIPE_COM           0x2b0
#define USB3_PN_MOD             0x2c0
#define USB3_PN_RAMMAP          0x2c4
#define USB3_PN_CON             0x2c8
#define USB3_PN_STA             0x2cc
#define USB3_PN_INT_STA         0x2d0
#define USB3_PN_INT_ENA         0x2d4
#define USB3_PN_LNG             0x2e0
#define USB3_PN_READ            0x2e4
#define USB3_PN_WRITE           0x2e8
#define USB3_SSIFCMD            0x340

/* AXI_INT_ENA and AXI_INT_STA */
#define AXI_INT_DMAINT          BIT(31)
#define AXI_INT_EPCINT          BIT(30)
/* PRD's n = from 1 to 4 */
#define AXI_INT_PRDEN_CLR_STA_SHIFT(n)  (16 + (n) - 1)
#define AXI_INT_PRDERR_STA_SHIFT(n)     (0 + (n) - 1)
#define AXI_INT_PRDEN_CLR_STA(n)        (1 << AXI_INT_PRDEN_CLR_STA_SHIFT(n))
#define AXI_INT_PRDERR_STA(n)           (1 << AXI_INT_PRDERR_STA_SHIFT(n))

/* DMA_INT_ENA and DMA_INT_STA */
#define DMA_INT(n)              BIT(n)

/* DMA_CH0_CONn */
#define DMA_CON_PIPE_DIR        BIT(15)         /* 1: In Transfer */
#define DMA_CON_PIPE_NO_SHIFT   8
#define DMA_CON_PIPE_NO_MASK    GENMASK(12, DMA_CON_PIPE_NO_SHIFT)
#define DMA_COM_PIPE_NO(n)      (((n) << DMA_CON_PIPE_NO_SHIFT) & \
                                         DMA_CON_PIPE_NO_MASK)
#define DMA_CON_PRD_EN          BIT(0)

/* LCLKSEL */
#define LCLKSEL_LSEL            BIT(18)

/* USB_COM_CON */
#define USB_COM_CON_CONF                BIT(24)
#define USB_COM_CON_PN_WDATAIF_NL       BIT(23)
#define USB_COM_CON_PN_RDATAIF_NL       BIT(22)
#define USB_COM_CON_PN_LSTTR_PP         BIT(21)
#define USB_COM_CON_SPD_MODE            BIT(17)
#define USB_COM_CON_EP0_EN              BIT(16)
#define USB_COM_CON_DEV_ADDR_SHIFT      8
#define USB_COM_CON_DEV_ADDR_MASK       GENMASK(14, USB_COM_CON_DEV_ADDR_SHIFT)
#define USB_COM_CON_DEV_ADDR(n)         (((n) << USB_COM_CON_DEV_ADDR_SHIFT) & \
                                         USB_COM_CON_DEV_ADDR_MASK)
#define USB_COM_CON_RX_DETECTION        BIT(1)
#define USB_COM_CON_PIPE_CLR            BIT(0)

/* USB20_CON */
#define USB20_CON_B2_PUE                BIT(31)
#define USB20_CON_B2_SUSPEND            BIT(24)
#define USB20_CON_B2_CONNECT            BIT(17)
#define USB20_CON_B2_TSTMOD_SHIFT       8
#define USB20_CON_B2_TSTMOD_MASK        GENMASK(10, USB20_CON_B2_TSTMOD_SHIFT)
#define USB20_CON_B2_TSTMOD(n)          (((n) << USB20_CON_B2_TSTMOD_SHIFT) & \
                                         USB20_CON_B2_TSTMOD_MASK)
#define USB20_CON_B2_TSTMOD_EN          BIT(0)

/* USB30_CON */
#define USB30_CON_POW_SEL_SHIFT         24
#define USB30_CON_POW_SEL_MASK          GENMASK(26, USB30_CON_POW_SEL_SHIFT)
#define USB30_CON_POW_SEL_IN_U3         BIT(26)
#define USB30_CON_POW_SEL_IN_DISCON     0
#define USB30_CON_POW_SEL_P2_TO_P0      BIT(25)
#define USB30_CON_POW_SEL_P0_TO_P3      BIT(24)
#define USB30_CON_POW_SEL_P0_TO_P2      0
#define USB30_CON_B3_PLLWAKE            BIT(23)
#define USB30_CON_B3_CONNECT            BIT(17)
#define USB30_CON_B3_HOTRST_CMP         BIT(1)

/* USB_STA */
#define USB_STA_SPEED_MASK      (BIT(2) | BIT(1))
#define USB_STA_SPEED_HS        BIT(2)
#define USB_STA_SPEED_FS        BIT(1)
#define USB_STA_SPEED_SS        0
#define USB_STA_VBUS_STA        BIT(0)

/* DRD_CON */
#define DRD_CON_PERI_CON        BIT(24)
#define DRD_CON_VBOUT           BIT(0)

/* USB_INT_ENA_1 and USB_INT_STA_1 */
#define USB_INT_1_B3_PLLWKUP    BIT(31)
#define USB_INT_1_B3_LUPSUCS    BIT(30)
#define USB_INT_1_B3_DISABLE    BIT(27)
#define USB_INT_1_B3_WRMRST     BIT(21)
#define USB_INT_1_B3_HOTRST     BIT(20)
#define USB_INT_1_B2_USBRST     BIT(12)
#define USB_INT_1_B2_L1SPND     BIT(11)
#define USB_INT_1_B2_SPND       BIT(9)
#define USB_INT_1_B2_RSUM       BIT(8)
#define USB_INT_1_SPEED         BIT(1)
#define USB_INT_1_VBUS_CNG      BIT(0)

/* USB_INT_ENA_2 and USB_INT_STA_2 */
#define USB_INT_2_PIPE(n)       BIT(n)

/* USB_OTG_STA, USB_OTG_INT_STA and USB_OTG_INT_ENA */
#define USB_OTG_IDMON           BIT(4)

/* P0_MOD */
#define P0_MOD_DIR              BIT(6)

/* P0_CON and PN_CON */
#define PX_CON_BYTE_EN_MASK             (BIT(10) | BIT(9))
#define PX_CON_BYTE_EN_SHIFT            9
#define PX_CON_BYTE_EN_BYTES(n)         (((n) << PX_CON_BYTE_EN_SHIFT) & \
                                         PX_CON_BYTE_EN_MASK)
#define PX_CON_SEND                     BIT(8)

/* P0_CON */
#define P0_CON_ST_RES_MASK              (BIT(27) | BIT(26))
#define P0_CON_ST_RES_FORCE_STALL       BIT(27)
#define P0_CON_ST_RES_NORMAL            BIT(26)
#define P0_CON_ST_RES_FORCE_NRDY        0
#define P0_CON_OT_RES_MASK              (BIT(25) | BIT(24))
#define P0_CON_OT_RES_FORCE_STALL       BIT(25)
#define P0_CON_OT_RES_NORMAL            BIT(24)
#define P0_CON_OT_RES_FORCE_NRDY        0
#define P0_CON_IN_RES_MASK              (BIT(17) | BIT(16))
#define P0_CON_IN_RES_FORCE_STALL       BIT(17)
#define P0_CON_IN_RES_NORMAL            BIT(16)
#define P0_CON_IN_RES_FORCE_NRDY        0
#define P0_CON_RES_WEN                  BIT(7)
#define P0_CON_BCLR                     BIT(1)

/* P0_STA and PN_STA */
#define PX_STA_BUFSTS           BIT(0)

/* P0_INT_ENA and P0_INT_STA */
#define P0_INT_STSED            BIT(18)
#define P0_INT_STSST            BIT(17)
#define P0_INT_SETUP            BIT(16)
#define P0_INT_RCVNL            BIT(8)
#define P0_INT_ERDY             BIT(7)
#define P0_INT_FLOW             BIT(6)
#define P0_INT_STALL            BIT(2)
#define P0_INT_NRDY             BIT(1)
#define P0_INT_BFRDY            BIT(0)
#define P0_INT_ALL_BITS         (P0_INT_STSED | P0_INT_SETUP | P0_INT_BFRDY)

/* PN_MOD */
#define PN_MOD_DIR              BIT(6)
#define PN_MOD_TYPE_SHIFT       4
#define PN_MOD_TYPE_MASK        GENMASK(5, PN_MOD_TYPE_SHIFT)
#define PN_MOD_TYPE(n)          (((n) << PN_MOD_TYPE_SHIFT) & \
                                 PN_MOD_TYPE_MASK)
#define PN_MOD_EPNUM_MASK       GENMASK(3, 0)
#define PN_MOD_EPNUM(n)         ((n) & PN_MOD_EPNUM_MASK)

/* PN_RAMMAP */
#define PN_RAMMAP_RAMAREA_SHIFT 29
#define PN_RAMMAP_RAMAREA_MASK  GENMASK(31, PN_RAMMAP_RAMAREA_SHIFT)
#define PN_RAMMAP_RAMAREA_16KB  BIT(31)
#define PN_RAMMAP_RAMAREA_8KB   (BIT(30) | BIT(29))
#define PN_RAMMAP_RAMAREA_4KB   BIT(30)
#define PN_RAMMAP_RAMAREA_2KB   BIT(29)
#define PN_RAMMAP_RAMAREA_1KB   0
#define PN_RAMMAP_MPKT_SHIFT    16
#define PN_RAMMAP_MPKT_MASK     GENMASK(26, PN_RAMMAP_MPKT_SHIFT)
#define PN_RAMMAP_MPKT(n)       (((n) << PN_RAMMAP_MPKT_SHIFT) & \
                                 PN_RAMMAP_MPKT_MASK)
#define PN_RAMMAP_RAMIF_SHIFT   14
#define PN_RAMMAP_RAMIF_MASK    GENMASK(15, PN_RAMMAP_RAMIF_SHIFT)
#define PN_RAMMAP_RAMIF(n)      (((n) << PN_RAMMAP_RAMIF_SHIFT) & \
                                 PN_RAMMAP_RAMIF_MASK)
#define PN_RAMMAP_BASEAD_MASK   GENMASK(13, 0)
#define PN_RAMMAP_BASEAD(offs)  (((offs) >> 3) & PN_RAMMAP_BASEAD_MASK)
#define PN_RAMMAP_DATA(area, ramif, basead)     ((PN_RAMMAP_##area) | \
                                                 (PN_RAMMAP_RAMIF(ramif)) | \
                                                 (PN_RAMMAP_BASEAD(basead)))

/* PN_CON */
#define PN_CON_EN               BIT(31)
#define PN_CON_DATAIF_EN        BIT(30)
#define PN_CON_RES_MASK         (BIT(17) | BIT(16))
#define PN_CON_RES_FORCE_STALL  BIT(17)
#define PN_CON_RES_NORMAL       BIT(16)
#define PN_CON_RES_FORCE_NRDY   0
#define PN_CON_LAST             BIT(11)
#define PN_CON_RES_WEN          BIT(7)
#define PN_CON_CLR              BIT(0)

/* PN_INT_STA and PN_INT_ENA */
#define PN_INT_LSTTR    BIT(4)
#define PN_INT_BFRDY    BIT(0)

/* USB3_SSIFCMD */
#define SSIFCMD_URES_U2         BIT(9)
#define SSIFCMD_URES_U1         BIT(8)
#define SSIFCMD_UDIR_U2         BIT(7)
#define SSIFCMD_UDIR_U1         BIT(6)
#define SSIFCMD_UREQ_U2         BIT(5)
#define SSIFCMD_UREQ_U1         BIT(4)

#define USB3_EP0_SS_MAX_PACKET_SIZE     512
#define USB3_EP0_HSFS_MAX_PACKET_SIZE   64
#define USB3_EP0_BUF_SIZE               8
#define USB3_MAX_NUM_PIPES              30
#define USB3_WAIT_US                    3
#define USB3_DMA_NUM_SETTING_AREA       4
/*
 * To avoid double-meaning of "0" (xferred 65536 bytes or received zlp if
 * buffer size is 65536), this driver uses the maximum size per a entry is
 * 32768 bytes.
 */
#define USB3_DMA_MAX_XFER_SIZE          32768
#define USB3_DMA_PRD_SIZE               4096

struct renesas_usb3;

/* Physical Region Descriptor Table */
struct renesas_usb3_prd {
        u32 word1;
#define USB3_PRD1_E             BIT(30)         /* the end of chain */
#define USB3_PRD1_U             BIT(29)         /* completion of transfer */
#define USB3_PRD1_D             BIT(28)         /* Error occurred */
#define USB3_PRD1_INT           BIT(27)         /* Interrupt occurred */
#define USB3_PRD1_LST           BIT(26)         /* Last Packet */
#define USB3_PRD1_B_INC         BIT(24)
#define USB3_PRD1_MPS_8         0
#define USB3_PRD1_MPS_16        BIT(21)
#define USB3_PRD1_MPS_32        BIT(22)
#define USB3_PRD1_MPS_64        (BIT(22) | BIT(21))
#define USB3_PRD1_MPS_512       BIT(23)
#define USB3_PRD1_MPS_1024      (BIT(23) | BIT(21))
#define USB3_PRD1_MPS_RESERVED  (BIT(23) | BIT(22) | BIT(21))
#define USB3_PRD1_SIZE_MASK     GENMASK(15, 0)

        u32 bap;
};
#define USB3_DMA_NUM_PRD_ENTRIES        (USB3_DMA_PRD_SIZE / \
                                          sizeof(struct renesas_usb3_prd))
#define USB3_DMA_MAX_XFER_SIZE_ALL_PRDS (USB3_DMA_PRD_SIZE / \
                                         sizeof(struct renesas_usb3_prd) * \
                                         USB3_DMA_MAX_XFER_SIZE)

struct renesas_usb3_dma {
        struct renesas_usb3_prd *prd;
        dma_addr_t prd_dma;
        int num;        /* Setting area number (from 1 to 4) */
        bool used;
};

struct renesas_usb3_request {
        struct usb_request      req;
        struct list_head        queue;
};

#define USB3_EP_NAME_SIZE       8
struct renesas_usb3_ep {
        struct usb_ep ep;
        struct renesas_usb3 *usb3;
        struct renesas_usb3_dma *dma;
        int num;
        char ep_name[USB3_EP_NAME_SIZE];
        struct list_head queue;
        u32 rammap_val;
        bool dir_in;
        bool halt;
        bool wedge;
        bool started;
};

struct renesas_usb3_priv {
        int ramsize_per_ramif;          /* unit = bytes */
        int num_ramif;
        int ramsize_per_pipe;           /* unit = bytes */
        bool workaround_for_vbus;       /* if true, don't check vbus signal */
};

struct renesas_usb3 {
        void __iomem *reg;

        struct usb_gadget gadget;
        struct usb_gadget_driver *driver;
        struct extcon_dev *extcon;
        struct work_struct extcon_work;

        struct renesas_usb3_ep *usb3_ep;
        int num_usb3_eps;

        struct renesas_usb3_dma dma[USB3_DMA_NUM_SETTING_AREA];

        spinlock_t lock;
        int disabled_count;

        struct usb_request *ep0_req;
        u16 test_mode;
        u8 ep0_buf[USB3_EP0_BUF_SIZE];
        bool softconnect;
        bool workaround_for_vbus;
        bool extcon_host;               /* check id and set EXTCON_USB_HOST */
        bool extcon_usb;                /* check vbus and set EXTCON_USB */
};

#define gadget_to_renesas_usb3(_gadget) \
                container_of(_gadget, struct renesas_usb3, gadget)
#define renesas_usb3_to_gadget(renesas_usb3) (&renesas_usb3->gadget)
#define usb3_to_dev(_usb3)      (_usb3->gadget.dev.parent)

#define usb_ep_to_usb3_ep(_ep) container_of(_ep, struct renesas_usb3_ep, ep)
#define usb3_ep_to_usb3(_usb3_ep) (_usb3_ep->usb3)
#define usb_req_to_usb3_req(_req) container_of(_req, \
                                            struct renesas_usb3_request, req)

#define usb3_get_ep(usb3, n) ((usb3)->usb3_ep + (n))
#define usb3_for_each_ep(usb3_ep, usb3, i)                      \
                for ((i) = 0, usb3_ep = usb3_get_ep(usb3, (i)); \
                     (i) < (usb3)->num_usb3_eps;                \
                     (i)++, usb3_ep = usb3_get_ep(usb3, (i)))

#define usb3_get_dma(usb3, i)   (&(usb3)->dma[i])
#define usb3_for_each_dma(usb3, dma, i)                         \
                for ((i) = 0, dma = usb3_get_dma((usb3), (i));  \
                     (i) < USB3_DMA_NUM_SETTING_AREA;           \
                     (i)++, dma = usb3_get_dma((usb3), (i)))

static const char udc_name[] = "renesas_usb3";

static bool use_dma = 1;
module_param(use_dma, bool, 0644);
MODULE_PARM_DESC(use_dma, "use dedicated DMAC");

static void usb3_write(struct renesas_usb3 *usb3, u32 data, u32 offs)
{
        iowrite32(data, usb3->reg + offs);
}

static u32 usb3_read(struct renesas_usb3 *usb3, u32 offs)
{
        return ioread32(usb3->reg + offs);
}

static void usb3_set_bit(struct renesas_usb3 *usb3, u32 bits, u32 offs)
{
        u32 val = usb3_read(usb3, offs);

        val |= bits;
        usb3_write(usb3, val, offs);
}

static void usb3_clear_bit(struct renesas_usb3 *usb3, u32 bits, u32 offs)
{
        u32 val = usb3_read(usb3, offs);

        val &= ~bits;
        usb3_write(usb3, val, offs);
}

static int usb3_wait(struct renesas_usb3 *usb3, u32 reg, u32 mask,
                     u32 expected)
{
        int i;

        for (i = 0; i < USB3_WAIT_US; i++) {
                if ((usb3_read(usb3, reg) & mask) == expected)
                        return 0;
                udelay(1);
        }

        dev_dbg(usb3_to_dev(usb3), "%s: timed out (%8x, %08x, %08x)\n",
                __func__, reg, mask, expected);

        return -EBUSY;
}

static void renesas_usb3_extcon_work(struct work_struct *work)
{
        struct renesas_usb3 *usb3 = container_of(work, struct renesas_usb3,
                                                 extcon_work);

        extcon_set_state_sync(usb3->extcon, EXTCON_USB_HOST, usb3->extcon_host);
        extcon_set_state_sync(usb3->extcon, EXTCON_USB, usb3->extcon_usb);
}

static void usb3_enable_irq_1(struct renesas_usb3 *usb3, u32 bits)
{
        usb3_set_bit(usb3, bits, USB3_USB_INT_ENA_1);
}

static void usb3_disable_irq_1(struct renesas_usb3 *usb3, u32 bits)
{
        usb3_clear_bit(usb3, bits, USB3_USB_INT_ENA_1);
}

static void usb3_enable_pipe_irq(struct renesas_usb3 *usb3, int num)
{
        usb3_set_bit(usb3, USB_INT_2_PIPE(num), USB3_USB_INT_ENA_2);
}

static void usb3_disable_pipe_irq(struct renesas_usb3 *usb3, int num)
{
        usb3_clear_bit(usb3, USB_INT_2_PIPE(num), USB3_USB_INT_ENA_2);
}

static bool usb3_is_host(struct renesas_usb3 *usb3)
{
        return !(usb3_read(usb3, USB3_DRD_CON) & DRD_CON_PERI_CON);
}

static void usb3_init_axi_bridge(struct renesas_usb3 *usb3)
{
        /* Set AXI_INT */
        usb3_write(usb3, ~0, USB3_DMA_INT_STA);
        usb3_write(usb3, 0, USB3_DMA_INT_ENA);
        usb3_set_bit(usb3, AXI_INT_DMAINT | AXI_INT_EPCINT, USB3_AXI_INT_ENA);
}

static void usb3_init_epc_registers(struct renesas_usb3 *usb3)
{
        usb3_write(usb3, ~0, USB3_USB_INT_STA_1);
        usb3_enable_irq_1(usb3, USB_INT_1_VBUS_CNG);
}

static bool usb3_wakeup_usb2_phy(struct renesas_usb3 *usb3)
{
        if (!(usb3_read(usb3, USB3_USB20_CON) & USB20_CON_B2_SUSPEND))
                return true;    /* already waked it up */

        usb3_clear_bit(usb3, USB20_CON_B2_SUSPEND, USB3_USB20_CON);
        usb3_enable_irq_1(usb3, USB_INT_1_B2_RSUM);

        return false;
}

static void usb3_usb2_pullup(struct renesas_usb3 *usb3, int pullup)
{
        u32 bits = USB20_CON_B2_PUE | USB20_CON_B2_CONNECT;

        if (usb3->softconnect && pullup)
                usb3_set_bit(usb3, bits, USB3_USB20_CON);
        else
                usb3_clear_bit(usb3, bits, USB3_USB20_CON);
}

static void usb3_set_test_mode(struct renesas_usb3 *usb3)
{
        u32 val = usb3_read(usb3, USB3_USB20_CON);

        val &= ~USB20_CON_B2_TSTMOD_MASK;
        val |= USB20_CON_B2_TSTMOD(usb3->test_mode);
        usb3_write(usb3, val | USB20_CON_B2_TSTMOD_EN, USB3_USB20_CON);
        if (!usb3->test_mode)
                usb3_clear_bit(usb3, USB20_CON_B2_TSTMOD_EN, USB3_USB20_CON);
}

static void usb3_start_usb2_connection(struct renesas_usb3 *usb3)
{
        usb3->disabled_count++;
        usb3_set_bit(usb3, USB_COM_CON_EP0_EN, USB3_USB_COM_CON);
        usb3_set_bit(usb3, USB_COM_CON_SPD_MODE, USB3_USB_COM_CON);
        usb3_usb2_pullup(usb3, 1);
}

static int usb3_is_usb3_phy_in_u3(struct renesas_usb3 *usb3)
{
        return usb3_read(usb3, USB3_USB30_CON) & USB30_CON_POW_SEL_IN_U3;
}

static bool usb3_wakeup_usb3_phy(struct renesas_usb3 *usb3)
{
        if (!usb3_is_usb3_phy_in_u3(usb3))
                return true;    /* already waked it up */

        usb3_set_bit(usb3, USB30_CON_B3_PLLWAKE, USB3_USB30_CON);
        usb3_enable_irq_1(usb3, USB_INT_1_B3_PLLWKUP);

        return false;
}

static u16 usb3_feature_get_un_enabled(struct renesas_usb3 *usb3)
{
        u32 mask_u2 = SSIFCMD_UDIR_U2 | SSIFCMD_UREQ_U2;
        u32 mask_u1 = SSIFCMD_UDIR_U1 | SSIFCMD_UREQ_U1;
        u32 val = usb3_read(usb3, USB3_SSIFCMD);
        u16 ret = 0;

        /* Enables {U2,U1} if the bits of UDIR and UREQ are set to 0 */
        if (!(val & mask_u2))
                ret |= 1 << USB_DEV_STAT_U2_ENABLED;
        if (!(val & mask_u1))
                ret |= 1 << USB_DEV_STAT_U1_ENABLED;

        return ret;
}

static void usb3_feature_u2_enable(struct renesas_usb3 *usb3, bool enable)
{
        u32 bits = SSIFCMD_UDIR_U2 | SSIFCMD_UREQ_U2;

        /* Enables U2 if the bits of UDIR and UREQ are set to 0 */
        if (enable)
                usb3_clear_bit(usb3, bits, USB3_SSIFCMD);
        else
                usb3_set_bit(usb3, bits, USB3_SSIFCMD);
}

static void usb3_feature_u1_enable(struct renesas_usb3 *usb3, bool enable)
{
        u32 bits = SSIFCMD_UDIR_U1 | SSIFCMD_UREQ_U1;

        /* Enables U1 if the bits of UDIR and UREQ are set to 0 */
        if (enable)
                usb3_clear_bit(usb3, bits, USB3_SSIFCMD);
        else
                usb3_set_bit(usb3, bits, USB3_SSIFCMD);
}

static void usb3_start_operation_for_usb3(struct renesas_usb3 *usb3)
{
        usb3_set_bit(usb3, USB_COM_CON_EP0_EN, USB3_USB_COM_CON);
        usb3_clear_bit(usb3, USB_COM_CON_SPD_MODE, USB3_USB_COM_CON);
        usb3_set_bit(usb3, USB30_CON_B3_CONNECT, USB3_USB30_CON);
}

static void usb3_start_usb3_connection(struct renesas_usb3 *usb3)
{
        usb3_start_operation_for_usb3(usb3);
        usb3_set_bit(usb3, USB_COM_CON_RX_DETECTION, USB3_USB_COM_CON);

        usb3_enable_irq_1(usb3, USB_INT_1_B3_LUPSUCS | USB_INT_1_B3_DISABLE |
                          USB_INT_1_SPEED);
}

static void usb3_stop_usb3_connection(struct renesas_usb3 *usb3)
{
        usb3_clear_bit(usb3, USB30_CON_B3_CONNECT, USB3_USB30_CON);
}

static void usb3_transition_to_default_state(struct renesas_usb3 *usb3,
                                             bool is_usb3)
{
        usb3_set_bit(usb3, USB_INT_2_PIPE(0), USB3_USB_INT_ENA_2);
        usb3_write(usb3, P0_INT_ALL_BITS, USB3_P0_INT_STA);
        usb3_set_bit(usb3, P0_INT_ALL_BITS, USB3_P0_INT_ENA);

        if (is_usb3)
                usb3_enable_irq_1(usb3, USB_INT_1_B3_WRMRST |
                                  USB_INT_1_B3_HOTRST);
        else
                usb3_enable_irq_1(usb3, USB_INT_1_B2_SPND |
                                  USB_INT_1_B2_L1SPND | USB_INT_1_B2_USBRST);
}

static void usb3_connect(struct renesas_usb3 *usb3)
{
        if (usb3_wakeup_usb3_phy(usb3))
                usb3_start_usb3_connection(usb3);
}

static void usb3_reset_epc(struct renesas_usb3 *usb3)
{
        usb3_clear_bit(usb3, USB_COM_CON_CONF, USB3_USB_COM_CON);
        usb3_clear_bit(usb3, USB_COM_CON_EP0_EN, USB3_USB_COM_CON);
        usb3_set_bit(usb3, USB_COM_CON_PIPE_CLR, USB3_USB_COM_CON);
        usb3->test_mode = 0;
        usb3_set_test_mode(usb3);
}

static void usb3_disconnect(struct renesas_usb3 *usb3)
{
        usb3->disabled_count = 0;
        usb3_usb2_pullup(usb3, 0);
        usb3_clear_bit(usb3, USB30_CON_B3_CONNECT, USB3_USB30_CON);
        usb3_reset_epc(usb3);

        if (usb3->driver)
                usb3->driver->disconnect(&usb3->gadget);
}

static void usb3_check_vbus(struct renesas_usb3 *usb3)
{
        if (usb3->workaround_for_vbus) {
                usb3_connect(usb3);
        } else {
                usb3->extcon_usb = !!(usb3_read(usb3, USB3_USB_STA) &
                                                        USB_STA_VBUS_STA);
                if (usb3->extcon_usb)
                        usb3_connect(usb3);
                else
                        usb3_disconnect(usb3);

                schedule_work(&usb3->extcon_work);
        }
}

static void usb3_set_mode(struct renesas_usb3 *usb3, bool host)
{
        if (host)
                usb3_clear_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON);
        else
                usb3_set_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON);
}

static void usb3_vbus_out(struct renesas_usb3 *usb3, bool enable)
{
        if (enable)
                usb3_set_bit(usb3, DRD_CON_VBOUT, USB3_DRD_CON);
        else
                usb3_clear_bit(usb3, DRD_CON_VBOUT, USB3_DRD_CON);
}

static void usb3_mode_config(struct renesas_usb3 *usb3, bool host, bool a_dev)
{
        unsigned long flags;

        spin_lock_irqsave(&usb3->lock, flags);
        usb3_set_mode(usb3, host);
        usb3_vbus_out(usb3, a_dev);
        if (!host && a_dev)             /* for A-Peripheral */
                usb3_connect(usb3);
        spin_unlock_irqrestore(&usb3->lock, flags);
}

static bool usb3_is_a_device(struct renesas_usb3 *usb3)
{
        return !(usb3_read(usb3, USB3_USB_OTG_STA) & USB_OTG_IDMON);
}

static void usb3_check_id(struct renesas_usb3 *usb3)
{
        usb3->extcon_host = usb3_is_a_device(usb3);

        if (usb3->extcon_host)
                usb3_mode_config(usb3, true, true);
        else
                usb3_mode_config(usb3, false, false);

        schedule_work(&usb3->extcon_work);
}

static void renesas_usb3_init_controller(struct renesas_usb3 *usb3)
{
        usb3_init_axi_bridge(usb3);
        usb3_init_epc_registers(usb3);
        usb3_set_bit(usb3, USB_COM_CON_PN_WDATAIF_NL |
                     USB_COM_CON_PN_RDATAIF_NL | USB_COM_CON_PN_LSTTR_PP,
                     USB3_USB_COM_CON);
        usb3_write(usb3, USB_OTG_IDMON, USB3_USB_OTG_INT_STA);
        usb3_write(usb3, USB_OTG_IDMON, USB3_USB_OTG_INT_ENA);

        usb3_check_id(usb3);
        usb3_check_vbus(usb3);
}

static void renesas_usb3_stop_controller(struct renesas_usb3 *usb3)
{
        usb3_disconnect(usb3);
        usb3_write(usb3, 0, USB3_P0_INT_ENA);
        usb3_write(usb3, 0, USB3_USB_OTG_INT_ENA);
        usb3_write(usb3, 0, USB3_USB_INT_ENA_1);
        usb3_write(usb3, 0, USB3_USB_INT_ENA_2);
        usb3_write(usb3, 0, USB3_AXI_INT_ENA);
}

static void usb3_irq_epc_int_1_pll_wakeup(struct renesas_usb3 *usb3)
{
        usb3_disable_irq_1(usb3, USB_INT_1_B3_PLLWKUP);
        usb3_clear_bit(usb3, USB30_CON_B3_PLLWAKE, USB3_USB30_CON);
        usb3_start_usb3_connection(usb3);
}

static void usb3_irq_epc_int_1_linkup_success(struct renesas_usb3 *usb3)
{
        usb3_transition_to_default_state(usb3, true);
}

static void usb3_irq_epc_int_1_resume(struct renesas_usb3 *usb3)
{
        usb3_disable_irq_1(usb3, USB_INT_1_B2_RSUM);
        usb3_start_usb2_connection(usb3);
        usb3_transition_to_default_state(usb3, false);
}

static void usb3_irq_epc_int_1_disable(struct renesas_usb3 *usb3)
{
        usb3_stop_usb3_connection(usb3);
        if (usb3_wakeup_usb2_phy(usb3))
                usb3_irq_epc_int_1_resume(usb3);
}

static void usb3_irq_epc_int_1_bus_reset(struct renesas_usb3 *usb3)
{
        usb3_reset_epc(usb3);
        if (usb3->disabled_count < 3)
                usb3_start_usb3_connection(usb3);
        else
                usb3_start_usb2_connection(usb3);
}

static void usb3_irq_epc_int_1_vbus_change(struct renesas_usb3 *usb3)
{
        usb3_check_vbus(usb3);
}

static void usb3_irq_epc_int_1_hot_reset(struct renesas_usb3 *usb3)
{
        usb3_reset_epc(usb3);
        usb3_set_bit(usb3, USB_COM_CON_EP0_EN, USB3_USB_COM_CON);

        /* This bit shall be set within 12ms from the start of HotReset */
        usb3_set_bit(usb3, USB30_CON_B3_HOTRST_CMP, USB3_USB30_CON);
}

static void usb3_irq_epc_int_1_warm_reset(struct renesas_usb3 *usb3)
{
        usb3_reset_epc(usb3);
        usb3_set_bit(usb3, USB_COM_CON_EP0_EN, USB3_USB_COM_CON);

        usb3_start_operation_for_usb3(usb3);
        usb3_enable_irq_1(usb3, USB_INT_1_SPEED);
}

static void usb3_irq_epc_int_1_speed(struct renesas_usb3 *usb3)
{
        u32 speed = usb3_read(usb3, USB3_USB_STA) & USB_STA_SPEED_MASK;

        switch (speed) {
        case USB_STA_SPEED_SS:
                usb3->gadget.speed = USB_SPEED_SUPER;
                break;
        case USB_STA_SPEED_HS:
                usb3->gadget.speed = USB_SPEED_HIGH;
                break;
        case USB_STA_SPEED_FS:
                usb3->gadget.speed = USB_SPEED_FULL;
                break;
        default:
                usb3->gadget.speed = USB_SPEED_UNKNOWN;
                break;
        }
}

static void usb3_irq_epc_int_1(struct renesas_usb3 *usb3, u32 int_sta_1)
{
        if (int_sta_1 & USB_INT_1_B3_PLLWKUP)
                usb3_irq_epc_int_1_pll_wakeup(usb3);

        if (int_sta_1 & USB_INT_1_B3_LUPSUCS)
                usb3_irq_epc_int_1_linkup_success(usb3);

        if (int_sta_1 & USB_INT_1_B3_HOTRST)
                usb3_irq_epc_int_1_hot_reset(usb3);

        if (int_sta_1 & USB_INT_1_B3_WRMRST)
                usb3_irq_epc_int_1_warm_reset(usb3);

        if (int_sta_1 & USB_INT_1_B3_DISABLE)
                usb3_irq_epc_int_1_disable(usb3);

        if (int_sta_1 & USB_INT_1_B2_USBRST)
                usb3_irq_epc_int_1_bus_reset(usb3);

        if (int_sta_1 & USB_INT_1_B2_RSUM)
                usb3_irq_epc_int_1_resume(usb3);

        if (int_sta_1 & USB_INT_1_SPEED)
                usb3_irq_epc_int_1_speed(usb3);

        if (int_sta_1 & USB_INT_1_VBUS_CNG)
                usb3_irq_epc_int_1_vbus_change(usb3);
}

static struct renesas_usb3_request *__usb3_get_request(struct renesas_usb3_ep
                                                       *usb3_ep)
{
        return list_first_entry_or_null(&usb3_ep->queue,
                                        struct renesas_usb3_request, queue);
}

static struct renesas_usb3_request *usb3_get_request(struct renesas_usb3_ep
                                                     *usb3_ep)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        struct renesas_usb3_request *usb3_req;
        unsigned long flags;

        spin_lock_irqsave(&usb3->lock, flags);
        usb3_req = __usb3_get_request(usb3_ep);
        spin_unlock_irqrestore(&usb3->lock, flags);

        return usb3_req;
}

static void __usb3_request_done(struct renesas_usb3_ep *usb3_ep,
                                struct renesas_usb3_request *usb3_req,
                                int status)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);

        dev_dbg(usb3_to_dev(usb3), "giveback: ep%2d, %u, %u, %d\n",
                usb3_ep->num, usb3_req->req.length, usb3_req->req.actual,
                status);
        usb3_req->req.status = status;
        usb3_ep->started = false;
        list_del_init(&usb3_req->queue);
        spin_unlock(&usb3->lock);
        usb_gadget_giveback_request(&usb3_ep->ep, &usb3_req->req);
        spin_lock(&usb3->lock);
}

static void usb3_request_done(struct renesas_usb3_ep *usb3_ep,
                              struct renesas_usb3_request *usb3_req, int status)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;

        spin_lock_irqsave(&usb3->lock, flags);
        __usb3_request_done(usb3_ep, usb3_req, status);
        spin_unlock_irqrestore(&usb3->lock, flags);
}

static void usb3_irq_epc_pipe0_status_end(struct renesas_usb3 *usb3)
{
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, 0);
        struct renesas_usb3_request *usb3_req = usb3_get_request(usb3_ep);

        if (usb3_req)
                usb3_request_done(usb3_ep, usb3_req, 0);
        if (usb3->test_mode)
                usb3_set_test_mode(usb3);
}

static void usb3_get_setup_data(struct renesas_usb3 *usb3,
                                struct usb_ctrlrequest *ctrl)
{
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, 0);
        u32 *data = (u32 *)ctrl;

        *data++ = usb3_read(usb3, USB3_STUP_DAT_0);
        *data = usb3_read(usb3, USB3_STUP_DAT_1);

        /* update this driver's flag */
        usb3_ep->dir_in = !!(ctrl->bRequestType & USB_DIR_IN);
}

static void usb3_set_p0_con_update_res(struct renesas_usb3 *usb3, u32 res)
{
        u32 val = usb3_read(usb3, USB3_P0_CON);

        val &= ~(P0_CON_ST_RES_MASK | P0_CON_OT_RES_MASK | P0_CON_IN_RES_MASK);
        val |= res | P0_CON_RES_WEN;
        usb3_write(usb3, val, USB3_P0_CON);
}

static void usb3_set_p0_con_for_ctrl_read_data(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_FORCE_NRDY |
                                   P0_CON_OT_RES_FORCE_STALL |
                                   P0_CON_IN_RES_NORMAL);
}

static void usb3_set_p0_con_for_ctrl_read_status(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_NORMAL |
                                   P0_CON_OT_RES_FORCE_STALL |
                                   P0_CON_IN_RES_NORMAL);
}

static void usb3_set_p0_con_for_ctrl_write_data(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_FORCE_NRDY |
                                   P0_CON_OT_RES_NORMAL |
                                   P0_CON_IN_RES_FORCE_STALL);
}

static void usb3_set_p0_con_for_ctrl_write_status(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_NORMAL |
                                   P0_CON_OT_RES_NORMAL |
                                   P0_CON_IN_RES_FORCE_STALL);
}

static void usb3_set_p0_con_for_no_data(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_NORMAL |
                                   P0_CON_OT_RES_FORCE_STALL |
                                   P0_CON_IN_RES_FORCE_STALL);
}

static void usb3_set_p0_con_stall(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_FORCE_STALL |
                                   P0_CON_OT_RES_FORCE_STALL |
                                   P0_CON_IN_RES_FORCE_STALL);
}

static void usb3_set_p0_con_stop(struct renesas_usb3 *usb3)
{
        usb3_set_p0_con_update_res(usb3, P0_CON_ST_RES_FORCE_NRDY |
                                   P0_CON_OT_RES_FORCE_NRDY |
                                   P0_CON_IN_RES_FORCE_NRDY);
}

static int usb3_pn_change(struct renesas_usb3 *usb3, int num)
{
        if (num == 0 || num > usb3->num_usb3_eps)
                return -ENXIO;

        usb3_write(usb3, num, USB3_PIPE_COM);

        return 0;
}

static void usb3_set_pn_con_update_res(struct renesas_usb3 *usb3, u32 res)
{
        u32 val = usb3_read(usb3, USB3_PN_CON);

        val &= ~PN_CON_RES_MASK;
        val |= res & PN_CON_RES_MASK;
        val |= PN_CON_RES_WEN;
        usb3_write(usb3, val, USB3_PN_CON);
}

static void usb3_pn_start(struct renesas_usb3 *usb3)
{
        usb3_set_pn_con_update_res(usb3, PN_CON_RES_NORMAL);
}

static void usb3_pn_stop(struct renesas_usb3 *usb3)
{
        usb3_set_pn_con_update_res(usb3, PN_CON_RES_FORCE_NRDY);
}

static void usb3_pn_stall(struct renesas_usb3 *usb3)
{
        usb3_set_pn_con_update_res(usb3, PN_CON_RES_FORCE_STALL);
}

static int usb3_pn_con_clear(struct renesas_usb3 *usb3)
{
        usb3_set_bit(usb3, PN_CON_CLR, USB3_PN_CON);

        return usb3_wait(usb3, USB3_PN_CON, PN_CON_CLR, 0);
}

static bool usb3_is_transfer_complete(struct renesas_usb3_ep *usb3_ep,
                                      struct renesas_usb3_request *usb3_req)
{
        struct usb_request *req = &usb3_req->req;

        if ((!req->zero && req->actual == req->length) ||
            (req->actual % usb3_ep->ep.maxpacket) || (req->length == 0))
                return true;

        else
                return false;
}

static int usb3_wait_pipe_status(struct renesas_usb3_ep *usb3_ep, u32 mask)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        u32 sta_reg = usb3_ep->num ? USB3_PN_STA : USB3_P0_STA;

        return usb3_wait(usb3, sta_reg, mask, mask);
}

static void usb3_set_px_con_send(struct renesas_usb3_ep *usb3_ep, int bytes,
                                 bool last)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        u32 con_reg = usb3_ep->num ? USB3_PN_CON : USB3_P0_CON;
        u32 val = usb3_read(usb3, con_reg);

        val |= PX_CON_SEND | PX_CON_BYTE_EN_BYTES(bytes);
        val |= (usb3_ep->num && last) ? PN_CON_LAST : 0;
        usb3_write(usb3, val, con_reg);
}

static int usb3_write_pipe(struct renesas_usb3_ep *usb3_ep,
                           struct renesas_usb3_request *usb3_req,
                           u32 fifo_reg)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        int i;
        int len = min_t(unsigned, usb3_req->req.length - usb3_req->req.actual,
                        usb3_ep->ep.maxpacket);
        u8 *buf = usb3_req->req.buf + usb3_req->req.actual;
        u32 tmp = 0;
        bool is_last;

        if (usb3_wait_pipe_status(usb3_ep, PX_STA_BUFSTS) < 0)
                return -EBUSY;

        /* Update gadget driver parameter */
        usb3_req->req.actual += len;

        /* Write data to the register */
        if (len >= 4) {
                iowrite32_rep(usb3->reg + fifo_reg, buf, len / 4);
                buf += (len / 4) * 4;
                len %= 4;       /* update len to use usb3_set_pX_con_send() */
        }

        if (len) {
                for (i = 0; i < len; i++)
                        tmp |= buf[i] << (8 * i);
                usb3_write(usb3, tmp, fifo_reg);
        }

        is_last = usb3_is_transfer_complete(usb3_ep, usb3_req);
        /* Send the data */
        usb3_set_px_con_send(usb3_ep, len, is_last);

        return is_last ? 0 : -EAGAIN;
}

static u32 usb3_get_received_length(struct renesas_usb3_ep *usb3_ep)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        u32 lng_reg = usb3_ep->num ? USB3_PN_LNG : USB3_P0_LNG;

        return usb3_read(usb3, lng_reg);
}

static int usb3_read_pipe(struct renesas_usb3_ep *usb3_ep,
                          struct renesas_usb3_request *usb3_req, u32 fifo_reg)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        int i;
        int len = min_t(unsigned, usb3_req->req.length - usb3_req->req.actual,
                        usb3_get_received_length(usb3_ep));
        u8 *buf = usb3_req->req.buf + usb3_req->req.actual;
        u32 tmp = 0;

        if (!len)
                return 0;

        /* Update gadget driver parameter */
        usb3_req->req.actual += len;

        /* Read data from the register */
        if (len >= 4) {
                ioread32_rep(usb3->reg + fifo_reg, buf, len / 4);
                buf += (len / 4) * 4;
                len %= 4;
        }

        if (len) {
                tmp = usb3_read(usb3, fifo_reg);
                for (i = 0; i < len; i++)
                        buf[i] = (tmp >> (8 * i)) & 0xff;
        }

        return usb3_is_transfer_complete(usb3_ep, usb3_req) ? 0 : -EAGAIN;
}

static void usb3_set_status_stage(struct renesas_usb3_ep *usb3_ep,
                                  struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);

        if (usb3_ep->dir_in) {
                usb3_set_p0_con_for_ctrl_read_status(usb3);
        } else {
                if (!usb3_req->req.length)
                        usb3_set_p0_con_for_no_data(usb3);
                else
                        usb3_set_p0_con_for_ctrl_write_status(usb3);
        }
}

static void usb3_p0_xfer(struct renesas_usb3_ep *usb3_ep,
                         struct renesas_usb3_request *usb3_req)
{
        int ret = -EAGAIN;

        if (usb3_ep->dir_in)
                ret = usb3_write_pipe(usb3_ep, usb3_req, USB3_P0_WRITE);
        else
                ret = usb3_read_pipe(usb3_ep, usb3_req, USB3_P0_READ);

        if (!ret)
                usb3_set_status_stage(usb3_ep, usb3_req);
}

static void usb3_start_pipe0(struct renesas_usb3_ep *usb3_ep,
                             struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);

        if (usb3_ep->started)
                return;

        usb3_ep->started = true;

        if (usb3_ep->dir_in) {
                usb3_set_bit(usb3, P0_MOD_DIR, USB3_P0_MOD);
                usb3_set_p0_con_for_ctrl_read_data(usb3);
        } else {
                usb3_clear_bit(usb3, P0_MOD_DIR, USB3_P0_MOD);
                usb3_set_p0_con_for_ctrl_write_data(usb3);
        }

        usb3_p0_xfer(usb3_ep, usb3_req);
}

static void usb3_enable_dma_pipen(struct renesas_usb3 *usb3)
{
        usb3_set_bit(usb3, PN_CON_DATAIF_EN, USB3_PN_CON);
}

static void usb3_disable_dma_pipen(struct renesas_usb3 *usb3)
{
        usb3_clear_bit(usb3, PN_CON_DATAIF_EN, USB3_PN_CON);
}

static void usb3_enable_dma_irq(struct renesas_usb3 *usb3, int num)
{
        usb3_set_bit(usb3, DMA_INT(num), USB3_DMA_INT_ENA);
}

static void usb3_disable_dma_irq(struct renesas_usb3 *usb3, int num)
{
        usb3_clear_bit(usb3, DMA_INT(num), USB3_DMA_INT_ENA);
}

static u32 usb3_dma_mps_to_prd_word1(struct renesas_usb3_ep *usb3_ep)
{
        switch (usb3_ep->ep.maxpacket) {
        case 8:
                return USB3_PRD1_MPS_8;
        case 16:
                return USB3_PRD1_MPS_16;
        case 32:
                return USB3_PRD1_MPS_32;
        case 64:
                return USB3_PRD1_MPS_64;
        case 512:
                return USB3_PRD1_MPS_512;
        case 1024:
                return USB3_PRD1_MPS_1024;
        default:
                return USB3_PRD1_MPS_RESERVED;
        }
}

static bool usb3_dma_get_setting_area(struct renesas_usb3_ep *usb3_ep,
                                      struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        struct renesas_usb3_dma *dma;
        int i;
        bool ret = false;

        if (usb3_req->req.length > USB3_DMA_MAX_XFER_SIZE_ALL_PRDS) {
                dev_dbg(usb3_to_dev(usb3), "%s: the length is too big (%d)\n",
                        __func__, usb3_req->req.length);
                return false;
        }

        /* The driver doesn't handle zero-length packet via dmac */
        if (!usb3_req->req.length)
                return false;

        if (usb3_dma_mps_to_prd_word1(usb3_ep) == USB3_PRD1_MPS_RESERVED)
                return false;

        usb3_for_each_dma(usb3, dma, i) {
                if (dma->used)
                        continue;

                if (usb_gadget_map_request(&usb3->gadget, &usb3_req->req,
                                           usb3_ep->dir_in) < 0)
                        break;

                dma->used = true;
                usb3_ep->dma = dma;
                ret = true;
                break;
        }

        return ret;
}

static void usb3_dma_put_setting_area(struct renesas_usb3_ep *usb3_ep,
                                      struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        int i;
        struct renesas_usb3_dma *dma;

        usb3_for_each_dma(usb3, dma, i) {
                if (usb3_ep->dma == dma) {
                        usb_gadget_unmap_request(&usb3->gadget, &usb3_req->req,
                                                 usb3_ep->dir_in);
                        dma->used = false;
                        usb3_ep->dma = NULL;
                        break;
                }
        }
}

static void usb3_dma_fill_prd(struct renesas_usb3_ep *usb3_ep,
                              struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3_prd *cur_prd = usb3_ep->dma->prd;
        u32 remain = usb3_req->req.length;
        u32 dma = usb3_req->req.dma;
        u32 len;
        int i = 0;

        do {
                len = min_t(u32, remain, USB3_DMA_MAX_XFER_SIZE) &
                            USB3_PRD1_SIZE_MASK;
                cur_prd->word1 = usb3_dma_mps_to_prd_word1(usb3_ep) |
                                 USB3_PRD1_B_INC | len;
                cur_prd->bap = dma;
                remain -= len;
                dma += len;
                if (!remain || (i + 1) < USB3_DMA_NUM_PRD_ENTRIES)
                        break;

                cur_prd++;
                i++;
        } while (1);

        cur_prd->word1 |= USB3_PRD1_E | USB3_PRD1_INT;
        if (usb3_ep->dir_in)
                cur_prd->word1 |= USB3_PRD1_LST;
}

static void usb3_dma_kick_prd(struct renesas_usb3_ep *usb3_ep)
{
        struct renesas_usb3_dma *dma = usb3_ep->dma;
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        u32 dma_con = DMA_COM_PIPE_NO(usb3_ep->num) | DMA_CON_PRD_EN;

        if (usb3_ep->dir_in)
                dma_con |= DMA_CON_PIPE_DIR;

        wmb();  /* prd entries should be in system memory here */

        usb3_write(usb3, 1 << usb3_ep->num, USB3_DMA_INT_STA);
        usb3_write(usb3, AXI_INT_PRDEN_CLR_STA(dma->num) |
                   AXI_INT_PRDERR_STA(dma->num), USB3_AXI_INT_STA);

        usb3_write(usb3, dma->prd_dma, USB3_DMA_CH0_PRD_ADR(dma->num));
        usb3_write(usb3, dma_con, USB3_DMA_CH0_CON(dma->num));
        usb3_enable_dma_irq(usb3, usb3_ep->num);
}

static void usb3_dma_stop_prd(struct renesas_usb3_ep *usb3_ep)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        struct renesas_usb3_dma *dma = usb3_ep->dma;

        usb3_disable_dma_irq(usb3, usb3_ep->num);
        usb3_write(usb3, 0, USB3_DMA_CH0_CON(dma->num));
}

static int usb3_dma_update_status(struct renesas_usb3_ep *usb3_ep,
                                  struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3_prd *cur_prd = usb3_ep->dma->prd;
        struct usb_request *req = &usb3_req->req;
        u32 remain, len;
        int i = 0;
        int status = 0;

        rmb();  /* The controller updated prd entries */

        do {
                if (cur_prd->word1 & USB3_PRD1_D)
                        status = -EIO;
                if (cur_prd->word1 & USB3_PRD1_E)
                        len = req->length % USB3_DMA_MAX_XFER_SIZE;
                else
                        len = USB3_DMA_MAX_XFER_SIZE;
                remain = cur_prd->word1 & USB3_PRD1_SIZE_MASK;
                req->actual += len - remain;

                if (cur_prd->word1 & USB3_PRD1_E ||
                    (i + 1) < USB3_DMA_NUM_PRD_ENTRIES)
                        break;

                cur_prd++;
                i++;
        } while (1);

        return status;
}

static bool usb3_dma_try_start(struct renesas_usb3_ep *usb3_ep,
                               struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);

        if (!use_dma)
                return false;

        if (usb3_dma_get_setting_area(usb3_ep, usb3_req)) {
                usb3_pn_stop(usb3);
                usb3_enable_dma_pipen(usb3);
                usb3_dma_fill_prd(usb3_ep, usb3_req);
                usb3_dma_kick_prd(usb3_ep);
                usb3_pn_start(usb3);
                return true;
        }

        return false;
}

static int usb3_dma_try_stop(struct renesas_usb3_ep *usb3_ep,
                             struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;
        int status = 0;

        spin_lock_irqsave(&usb3->lock, flags);
        if (!usb3_ep->dma)
                goto out;

        if (!usb3_pn_change(usb3, usb3_ep->num))
                usb3_disable_dma_pipen(usb3);
        usb3_dma_stop_prd(usb3_ep);
        status = usb3_dma_update_status(usb3_ep, usb3_req);
        usb3_dma_put_setting_area(usb3_ep, usb3_req);

out:
        spin_unlock_irqrestore(&usb3->lock, flags);
        return status;
}

static int renesas_usb3_dma_free_prd(struct renesas_usb3 *usb3,
                                     struct device *dev)
{
        int i;
        struct renesas_usb3_dma *dma;

        usb3_for_each_dma(usb3, dma, i) {
                if (dma->prd) {
                        dma_free_coherent(dev, USB3_DMA_PRD_SIZE,
                                          dma->prd, dma->prd_dma);
                        dma->prd = NULL;
                }
        }

        return 0;
}

static int renesas_usb3_dma_alloc_prd(struct renesas_usb3 *usb3,
                                      struct device *dev)
{
        int i;
        struct renesas_usb3_dma *dma;

        if (!use_dma)
                return 0;

        usb3_for_each_dma(usb3, dma, i) {
                dma->prd = dma_alloc_coherent(dev, USB3_DMA_PRD_SIZE,
                                              &dma->prd_dma, GFP_KERNEL);
                if (!dma->prd) {
                        renesas_usb3_dma_free_prd(usb3, dev);
                        return -ENOMEM;
                }
                dma->num = i + 1;
        }

        return 0;
}

static void usb3_start_pipen(struct renesas_usb3_ep *usb3_ep,
                             struct renesas_usb3_request *usb3_req)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        struct renesas_usb3_request *usb3_req_first = usb3_get_request(usb3_ep);
        unsigned long flags;
        int ret = -EAGAIN;
        u32 enable_bits = 0;

        spin_lock_irqsave(&usb3->lock, flags);
        if (usb3_ep->halt || usb3_ep->started)
                goto out;
        if (usb3_req != usb3_req_first)
                goto out;

        if (usb3_pn_change(usb3, usb3_ep->num) < 0)
                goto out;

        usb3_ep->started = true;

        if (usb3_dma_try_start(usb3_ep, usb3_req))
                goto out;

        usb3_pn_start(usb3);

        if (usb3_ep->dir_in) {
                ret = usb3_write_pipe(usb3_ep, usb3_req, USB3_PN_WRITE);
                enable_bits |= PN_INT_LSTTR;
        }

        if (ret < 0)
                enable_bits |= PN_INT_BFRDY;

        if (enable_bits) {
                usb3_set_bit(usb3, enable_bits, USB3_PN_INT_ENA);
                usb3_enable_pipe_irq(usb3, usb3_ep->num);
        }
out:
        spin_unlock_irqrestore(&usb3->lock, flags);
}

static int renesas_usb3_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
                                 gfp_t gfp_flags)
{
        struct renesas_usb3_ep *usb3_ep = usb_ep_to_usb3_ep(_ep);
        struct renesas_usb3_request *usb3_req = usb_req_to_usb3_req(_req);
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;

        dev_dbg(usb3_to_dev(usb3), "ep_queue: ep%2d, %u\n", usb3_ep->num,
                _req->length);

        _req->status = -EINPROGRESS;
        _req->actual = 0;
        spin_lock_irqsave(&usb3->lock, flags);
        list_add_tail(&usb3_req->queue, &usb3_ep->queue);
        spin_unlock_irqrestore(&usb3->lock, flags);

        if (!usb3_ep->num)
                usb3_start_pipe0(usb3_ep, usb3_req);
        else
                usb3_start_pipen(usb3_ep, usb3_req);

        return 0;
}

static void usb3_set_device_address(struct renesas_usb3 *usb3, u16 addr)
{
        /* DEV_ADDR bit field is cleared by WarmReset, HotReset and BusReset */
        usb3_set_bit(usb3, USB_COM_CON_DEV_ADDR(addr), USB3_USB_COM_CON);
}

static bool usb3_std_req_set_address(struct renesas_usb3 *usb3,
                                     struct usb_ctrlrequest *ctrl)
{
        if (ctrl->wValue >= 128)
                return true;    /* stall */

        usb3_set_device_address(usb3, ctrl->wValue);
        usb3_set_p0_con_for_no_data(usb3);

        return false;
}

static void usb3_pipe0_internal_xfer(struct renesas_usb3 *usb3,
                                     void *tx_data, size_t len,
                                     void (*complete)(struct usb_ep *ep,
                                                      struct usb_request *req))
{
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, 0);

        if (tx_data)
                memcpy(usb3->ep0_buf, tx_data,
                       min_t(size_t, len, USB3_EP0_BUF_SIZE));

        usb3->ep0_req->buf = &usb3->ep0_buf;
        usb3->ep0_req->length = len;
        usb3->ep0_req->complete = complete;
        renesas_usb3_ep_queue(&usb3_ep->ep, usb3->ep0_req, GFP_ATOMIC);
}

static void usb3_pipe0_get_status_completion(struct usb_ep *ep,
                                             struct usb_request *req)
{
}

static bool usb3_std_req_get_status(struct renesas_usb3 *usb3,
                                    struct usb_ctrlrequest *ctrl)
{
        bool stall = false;
        struct renesas_usb3_ep *usb3_ep;
        int num;
        u16 status = 0;

        switch (ctrl->bRequestType & USB_RECIP_MASK) {
        case USB_RECIP_DEVICE:
                if (usb3->gadget.is_selfpowered)
                        status |= 1 << USB_DEVICE_SELF_POWERED;
                if (usb3->gadget.speed == USB_SPEED_SUPER)
                        status |= usb3_feature_get_un_enabled(usb3);
                break;
        case USB_RECIP_INTERFACE:
                break;
        case USB_RECIP_ENDPOINT:
                num = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
                usb3_ep = usb3_get_ep(usb3, num);
                if (usb3_ep->halt)
                        status |= 1 << USB_ENDPOINT_HALT;
                break;
        default:
                stall = true;
                break;
        }

        if (!stall) {
                status = cpu_to_le16(status);
                dev_dbg(usb3_to_dev(usb3), "get_status: req = %p\n",
                        usb_req_to_usb3_req(usb3->ep0_req));
                usb3_pipe0_internal_xfer(usb3, &status, sizeof(status),
                                         usb3_pipe0_get_status_completion);
        }

        return stall;
}

static bool usb3_std_req_feature_device(struct renesas_usb3 *usb3,
                                        struct usb_ctrlrequest *ctrl, bool set)
{
        bool stall = true;
        u16 w_value = le16_to_cpu(ctrl->wValue);

        switch (w_value) {
        case USB_DEVICE_TEST_MODE:
                if (!set)
                        break;
                usb3->test_mode = le16_to_cpu(ctrl->wIndex) >> 8;
                stall = false;
                break;
        case USB_DEVICE_U1_ENABLE:
        case USB_DEVICE_U2_ENABLE:
                if (usb3->gadget.speed != USB_SPEED_SUPER)
                        break;
                if (w_value == USB_DEVICE_U1_ENABLE)
                        usb3_feature_u1_enable(usb3, set);
                if (w_value == USB_DEVICE_U2_ENABLE)
                        usb3_feature_u2_enable(usb3, set);
                stall = false;
                break;
        default:
                break;
        }

        return stall;
}

static int usb3_set_halt_p0(struct renesas_usb3_ep *usb3_ep, bool halt)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);

        if (unlikely(usb3_ep->num))
                return -EINVAL;

        usb3_ep->halt = halt;
        if (halt)
                usb3_set_p0_con_stall(usb3);
        else
                usb3_set_p0_con_stop(usb3);

        return 0;
}

static int usb3_set_halt_pn(struct renesas_usb3_ep *usb3_ep, bool halt,
                            bool is_clear_feature)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;

        spin_lock_irqsave(&usb3->lock, flags);
        if (!usb3_pn_change(usb3, usb3_ep->num)) {
                usb3_ep->halt = halt;
                if (halt) {
                        usb3_pn_stall(usb3);
                } else if (!is_clear_feature || !usb3_ep->wedge) {
                        usb3_pn_con_clear(usb3);
                        usb3_set_bit(usb3, PN_CON_EN, USB3_PN_CON);
                        usb3_pn_stop(usb3);
                }
        }
        spin_unlock_irqrestore(&usb3->lock, flags);

        return 0;
}

static int usb3_set_halt(struct renesas_usb3_ep *usb3_ep, bool halt,
                         bool is_clear_feature)
{
        int ret = 0;

        if (halt && usb3_ep->started)
                return -EAGAIN;

        if (usb3_ep->num)
                ret = usb3_set_halt_pn(usb3_ep, halt, is_clear_feature);
        else
                ret = usb3_set_halt_p0(usb3_ep, halt);

        return ret;
}

static bool usb3_std_req_feature_endpoint(struct renesas_usb3 *usb3,
                                          struct usb_ctrlrequest *ctrl,
                                          bool set)
{
        int num = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
        struct renesas_usb3_ep *usb3_ep;
        struct renesas_usb3_request *usb3_req;

        if (le16_to_cpu(ctrl->wValue) != USB_ENDPOINT_HALT)
                return true;    /* stall */

        usb3_ep = usb3_get_ep(usb3, num);
        usb3_set_halt(usb3_ep, set, true);

        /* Restarts a queue if clear feature */
        if (!set) {
                usb3_ep->started = false;
                usb3_req = usb3_get_request(usb3_ep);
                if (usb3_req)
                        usb3_start_pipen(usb3_ep, usb3_req);
        }

        return false;
}

static bool usb3_std_req_feature(struct renesas_usb3 *usb3,
                                 struct usb_ctrlrequest *ctrl, bool set)
{
        bool stall = false;

        switch (ctrl->bRequestType & USB_RECIP_MASK) {
        case USB_RECIP_DEVICE:
                stall = usb3_std_req_feature_device(usb3, ctrl, set);
                break;
        case USB_RECIP_INTERFACE:
                break;
        case USB_RECIP_ENDPOINT:
                stall = usb3_std_req_feature_endpoint(usb3, ctrl, set);
                break;
        default:
                stall = true;
                break;
        }

        if (!stall)
                usb3_set_p0_con_for_no_data(usb3);

        return stall;
}

static void usb3_pipe0_set_sel_completion(struct usb_ep *ep,
                                          struct usb_request *req)
{
        /* TODO */
}

static bool usb3_std_req_set_sel(struct renesas_usb3 *usb3,
                                 struct usb_ctrlrequest *ctrl)
{
        u16 w_length = le16_to_cpu(ctrl->wLength);

        if (w_length != 6)
                return true;    /* stall */

        dev_dbg(usb3_to_dev(usb3), "set_sel: req = %p\n",
                usb_req_to_usb3_req(usb3->ep0_req));
        usb3_pipe0_internal_xfer(usb3, NULL, 6, usb3_pipe0_set_sel_completion);

        return false;
}

static bool usb3_std_req_set_configuration(struct renesas_usb3 *usb3,
                                           struct usb_ctrlrequest *ctrl)
{
        if (ctrl->wValue > 0)
                usb3_set_bit(usb3, USB_COM_CON_CONF, USB3_USB_COM_CON);
        else
                usb3_clear_bit(usb3, USB_COM_CON_CONF, USB3_USB_COM_CON);

        return false;
}

/**
 * usb3_handle_standard_request - handle some standard requests
 * @usb3: the renesas_usb3 pointer
 * @ctrl: a pointer of setup data
 *
 * Returns true if this function handled a standard request
 */
static bool usb3_handle_standard_request(struct renesas_usb3 *usb3,
                                         struct usb_ctrlrequest *ctrl)
{
        bool ret = false;
        bool stall = false;

        if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
                switch (ctrl->bRequest) {
                case USB_REQ_SET_ADDRESS:
                        stall = usb3_std_req_set_address(usb3, ctrl);
                        ret = true;
                        break;
                case USB_REQ_GET_STATUS:
                        stall = usb3_std_req_get_status(usb3, ctrl);
                        ret = true;
                        break;
                case USB_REQ_CLEAR_FEATURE:
                        stall = usb3_std_req_feature(usb3, ctrl, false);
                        ret = true;
                        break;
                case USB_REQ_SET_FEATURE:
                        stall = usb3_std_req_feature(usb3, ctrl, true);
                        ret = true;
                        break;
                case USB_REQ_SET_SEL:
                        stall = usb3_std_req_set_sel(usb3, ctrl);
                        ret = true;
                        break;
                case USB_REQ_SET_ISOCH_DELAY:
                        /* This hardware doesn't support Isochronous xfer */
                        stall = true;
                        ret = true;
                        break;
                case USB_REQ_SET_CONFIGURATION:
                        usb3_std_req_set_configuration(usb3, ctrl);
                        break;
                default:
                        break;
                }
        }

        if (stall)
                usb3_set_p0_con_stall(usb3);

        return ret;
}

static int usb3_p0_con_clear_buffer(struct renesas_usb3 *usb3)
{
        usb3_set_bit(usb3, P0_CON_BCLR, USB3_P0_CON);

        return usb3_wait(usb3, USB3_P0_CON, P0_CON_BCLR, 0);
}

static void usb3_irq_epc_pipe0_setup(struct renesas_usb3 *usb3)
{
        struct usb_ctrlrequest ctrl;
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, 0);

        /* Call giveback function if previous transfer is not completed */
        if (usb3_ep->started)
                usb3_request_done(usb3_ep, usb3_get_request(usb3_ep),
                                  -ECONNRESET);

        usb3_p0_con_clear_buffer(usb3);
        usb3_get_setup_data(usb3, &ctrl);
        if (!usb3_handle_standard_request(usb3, &ctrl))
                if (usb3->driver->setup(&usb3->gadget, &ctrl) < 0)
                        usb3_set_p0_con_stall(usb3);
}

static void usb3_irq_epc_pipe0_bfrdy(struct renesas_usb3 *usb3)
{
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, 0);
        struct renesas_usb3_request *usb3_req = usb3_get_request(usb3_ep);

        if (!usb3_req)
                return;

        usb3_p0_xfer(usb3_ep, usb3_req);
}

static void usb3_irq_epc_pipe0(struct renesas_usb3 *usb3)
{
        u32 p0_int_sta = usb3_read(usb3, USB3_P0_INT_STA);

        p0_int_sta &= usb3_read(usb3, USB3_P0_INT_ENA);
        usb3_write(usb3, p0_int_sta, USB3_P0_INT_STA);
        if (p0_int_sta & P0_INT_STSED)
                usb3_irq_epc_pipe0_status_end(usb3);
        if (p0_int_sta & P0_INT_SETUP)
                usb3_irq_epc_pipe0_setup(usb3);
        if (p0_int_sta & P0_INT_BFRDY)
                usb3_irq_epc_pipe0_bfrdy(usb3);
}

static void usb3_request_done_pipen(struct renesas_usb3 *usb3,
                                    struct renesas_usb3_ep *usb3_ep,
                                    struct renesas_usb3_request *usb3_req,
                                    int status)
{
        unsigned long flags;

        spin_lock_irqsave(&usb3->lock, flags);
        if (usb3_pn_change(usb3, usb3_ep->num))
                usb3_pn_stop(usb3);
        spin_unlock_irqrestore(&usb3->lock, flags);

        usb3_disable_pipe_irq(usb3, usb3_ep->num);
        usb3_request_done(usb3_ep, usb3_req, status);

        /* get next usb3_req */
        usb3_req = usb3_get_request(usb3_ep);
        if (usb3_req)
                usb3_start_pipen(usb3_ep, usb3_req);
}

static void usb3_irq_epc_pipen_lsttr(struct renesas_usb3 *usb3, int num)
{
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, num);
        struct renesas_usb3_request *usb3_req = usb3_get_request(usb3_ep);

        if (!usb3_req)
                return;

        if (usb3_ep->dir_in) {
                dev_dbg(usb3_to_dev(usb3), "%s: len = %u, actual = %u\n",
                        __func__, usb3_req->req.length, usb3_req->req.actual);
                usb3_request_done_pipen(usb3, usb3_ep, usb3_req, 0);
        }
}

static void usb3_irq_epc_pipen_bfrdy(struct renesas_usb3 *usb3, int num)
{
        struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, num);
        struct renesas_usb3_request *usb3_req = usb3_get_request(usb3_ep);
        bool done = false;

        if (!usb3_req)
                return;

        spin_lock(&usb3->lock);
        if (usb3_pn_change(usb3, num))
                goto out;

        if (usb3_ep->dir_in) {
                /* Do not stop the IN pipe here to detect LSTTR interrupt */
                if (!usb3_write_pipe(usb3_ep, usb3_req, USB3_PN_WRITE))
                        usb3_clear_bit(usb3, PN_INT_BFRDY, USB3_PN_INT_ENA);
        } else {
                if (!usb3_read_pipe(usb3_ep, usb3_req, USB3_PN_READ))
                        done = true;
        }

out:
        /* need to unlock because usb3_request_done_pipen() locks it */
        spin_unlock(&usb3->lock);

        if (done)
                usb3_request_done_pipen(usb3, usb3_ep, usb3_req, 0);
}

static void usb3_irq_epc_pipen(struct renesas_usb3 *usb3, int num)
{
        u32 pn_int_sta;

        spin_lock(&usb3->lock);
        if (usb3_pn_change(usb3, num) < 0) {
                spin_unlock(&usb3->lock);
                return;
        }

        pn_int_sta = usb3_read(usb3, USB3_PN_INT_STA);
        pn_int_sta &= usb3_read(usb3, USB3_PN_INT_ENA);
        usb3_write(usb3, pn_int_sta, USB3_PN_INT_STA);
        spin_unlock(&usb3->lock);
        if (pn_int_sta & PN_INT_LSTTR)
                usb3_irq_epc_pipen_lsttr(usb3, num);
        if (pn_int_sta & PN_INT_BFRDY)
                usb3_irq_epc_pipen_bfrdy(usb3, num);
}

static void usb3_irq_epc_int_2(struct renesas_usb3 *usb3, u32 int_sta_2)
{
        int i;

        for (i = 0; i < usb3->num_usb3_eps; i++) {
                if (int_sta_2 & USB_INT_2_PIPE(i)) {
                        if (!i)
                                usb3_irq_epc_pipe0(usb3);
                        else
                                usb3_irq_epc_pipen(usb3, i);
                }
        }
}

static void usb3_irq_idmon_change(struct renesas_usb3 *usb3)
{
        usb3_check_id(usb3);
}

static void usb3_irq_otg_int(struct renesas_usb3 *usb3, u32 otg_int_sta)
{
        if (otg_int_sta & USB_OTG_IDMON)
                usb3_irq_idmon_change(usb3);
}

static void usb3_irq_epc(struct renesas_usb3 *usb3)
{
        u32 int_sta_1 = usb3_read(usb3, USB3_USB_INT_STA_1);
        u32 int_sta_2 = usb3_read(usb3, USB3_USB_INT_STA_2);
        u32 otg_int_sta = usb3_read(usb3, USB3_USB_OTG_INT_STA);

        int_sta_1 &= usb3_read(usb3, USB3_USB_INT_ENA_1);
        if (int_sta_1) {
                usb3_write(usb3, int_sta_1, USB3_USB_INT_STA_1);
                usb3_irq_epc_int_1(usb3, int_sta_1);
        }

        int_sta_2 &= usb3_read(usb3, USB3_USB_INT_ENA_2);
        if (int_sta_2)
                usb3_irq_epc_int_2(usb3, int_sta_2);

        otg_int_sta &= usb3_read(usb3, USB3_USB_OTG_INT_ENA);
        if (otg_int_sta) {
                usb3_write(usb3, otg_int_sta, USB3_USB_OTG_INT_STA);
                usb3_irq_otg_int(usb3, otg_int_sta);
        }
}

static void usb3_irq_dma_int(struct renesas_usb3 *usb3, u32 dma_sta)
{
        struct renesas_usb3_ep *usb3_ep;
        struct renesas_usb3_request *usb3_req;
        int i, status;

        for (i = 0; i < usb3->num_usb3_eps; i++) {
                if (!(dma_sta & DMA_INT(i)))
                        continue;

                usb3_ep = usb3_get_ep(usb3, i);
                if (!(usb3_read(usb3, USB3_AXI_INT_STA) &
                    AXI_INT_PRDEN_CLR_STA(usb3_ep->dma->num)))
                        continue;

                usb3_req = usb3_get_request(usb3_ep);
                status = usb3_dma_try_stop(usb3_ep, usb3_req);
                usb3_request_done_pipen(usb3, usb3_ep, usb3_req, status);
        }
}

static void usb3_irq_dma(struct renesas_usb3 *usb3)
{
        u32 dma_sta = usb3_read(usb3, USB3_DMA_INT_STA);

        dma_sta &= usb3_read(usb3, USB3_DMA_INT_ENA);
        if (dma_sta) {
                usb3_write(usb3, dma_sta, USB3_DMA_INT_STA);
                usb3_irq_dma_int(usb3, dma_sta);
        }
}

static irqreturn_t renesas_usb3_irq(int irq, void *_usb3)

{
        struct renesas_usb3 *usb3 = _usb3;
        irqreturn_t ret = IRQ_NONE;
        u32 axi_int_sta = usb3_read(usb3, USB3_AXI_INT_STA);

        if (axi_int_sta & AXI_INT_DMAINT) {
                usb3_irq_dma(usb3);
                ret = IRQ_HANDLED;
        }

        if (axi_int_sta & AXI_INT_EPCINT) {
                usb3_irq_epc(usb3);
                ret = IRQ_HANDLED;
        }

        return ret;
}

static void usb3_write_pn_mod(struct renesas_usb3_ep *usb3_ep,
                              const struct usb_endpoint_descriptor *desc)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        u32 val = 0;

        val |= usb3_ep->dir_in ? PN_MOD_DIR : 0;
        val |= PN_MOD_TYPE(usb_endpoint_type(desc));
        val |= PN_MOD_EPNUM(usb_endpoint_num(desc));
        usb3_write(usb3, val, USB3_PN_MOD);
}

static u32 usb3_calc_ramarea(int ram_size)
{
        WARN_ON(ram_size > SZ_16K);

        if (ram_size <= SZ_1K)
                return PN_RAMMAP_RAMAREA_1KB;
        else if (ram_size <= SZ_2K)
                return PN_RAMMAP_RAMAREA_2KB;
        else if (ram_size <= SZ_4K)
                return PN_RAMMAP_RAMAREA_4KB;
        else if (ram_size <= SZ_8K)
                return PN_RAMMAP_RAMAREA_8KB;
        else
                return PN_RAMMAP_RAMAREA_16KB;
}

static u32 usb3_calc_rammap_val(struct renesas_usb3_ep *usb3_ep,
                                const struct usb_endpoint_descriptor *desc)
{
        return usb3_ep->rammap_val | PN_RAMMAP_MPKT(usb_endpoint_maxp(desc));
}

static int usb3_enable_pipe_n(struct renesas_usb3_ep *usb3_ep,
                              const struct usb_endpoint_descriptor *desc)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;

        usb3_ep->dir_in = usb_endpoint_dir_in(desc);

        spin_lock_irqsave(&usb3->lock, flags);
        if (!usb3_pn_change(usb3, usb3_ep->num)) {
                usb3_write_pn_mod(usb3_ep, desc);
                usb3_write(usb3, usb3_calc_rammap_val(usb3_ep, desc),
                           USB3_PN_RAMMAP);
                usb3_pn_con_clear(usb3);
                usb3_set_bit(usb3, PN_CON_EN, USB3_PN_CON);
        }
        spin_unlock_irqrestore(&usb3->lock, flags);

        return 0;
}

static int usb3_disable_pipe_n(struct renesas_usb3_ep *usb3_ep)
{
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;

        usb3_ep->halt = false;

        spin_lock_irqsave(&usb3->lock, flags);
        if (!usb3_pn_change(usb3, usb3_ep->num)) {
                usb3_write(usb3, 0, USB3_PN_INT_ENA);
                usb3_write(usb3, 0, USB3_PN_RAMMAP);
                usb3_clear_bit(usb3, PN_CON_EN, USB3_PN_CON);
        }
        spin_unlock_irqrestore(&usb3->lock, flags);

        return 0;
}

/*------- usb_ep_ops -----------------------------------------------------*/
static int renesas_usb3_ep_enable(struct usb_ep *_ep,
                                  const struct usb_endpoint_descriptor *desc)
{
        struct renesas_usb3_ep *usb3_ep = usb_ep_to_usb3_ep(_ep);

        return usb3_enable_pipe_n(usb3_ep, desc);
}

static int renesas_usb3_ep_disable(struct usb_ep *_ep)
{
        struct renesas_usb3_ep *usb3_ep = usb_ep_to_usb3_ep(_ep);
        struct renesas_usb3_request *usb3_req;

        do {
                usb3_req = usb3_get_request(usb3_ep);
                if (!usb3_req)
                        break;
                usb3_dma_try_stop(usb3_ep, usb3_req);
                usb3_request_done(usb3_ep, usb3_req, -ESHUTDOWN);
        } while (1);

        return usb3_disable_pipe_n(usb3_ep);
}

static struct usb_request *__renesas_usb3_ep_alloc_request(gfp_t gfp_flags)
{
        struct renesas_usb3_request *usb3_req;

        usb3_req = kzalloc(sizeof(struct renesas_usb3_request), gfp_flags);
        if (!usb3_req)
                return NULL;

        INIT_LIST_HEAD(&usb3_req->queue);

        return &usb3_req->req;
}

static void __renesas_usb3_ep_free_request(struct usb_request *_req)
{
        struct renesas_usb3_request *usb3_req = usb_req_to_usb3_req(_req);

        kfree(usb3_req);
}

static struct usb_request *renesas_usb3_ep_alloc_request(struct usb_ep *_ep,
                                                         gfp_t gfp_flags)
{
        return __renesas_usb3_ep_alloc_request(gfp_flags);
}

static void renesas_usb3_ep_free_request(struct usb_ep *_ep,
                                         struct usb_request *_req)
{
        __renesas_usb3_ep_free_request(_req);
}

static int renesas_usb3_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
        struct renesas_usb3_ep *usb3_ep = usb_ep_to_usb3_ep(_ep);
        struct renesas_usb3_request *usb3_req = usb_req_to_usb3_req(_req);
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);

        dev_dbg(usb3_to_dev(usb3), "ep_dequeue: ep%2d, %u\n", usb3_ep->num,
                _req->length);

        usb3_dma_try_stop(usb3_ep, usb3_req);
        usb3_request_done_pipen(usb3, usb3_ep, usb3_req, -ECONNRESET);

        return 0;
}

static int renesas_usb3_ep_set_halt(struct usb_ep *_ep, int value)
{
        return usb3_set_halt(usb_ep_to_usb3_ep(_ep), !!value, false);
}

static int renesas_usb3_ep_set_wedge(struct usb_ep *_ep)
{
        struct renesas_usb3_ep *usb3_ep = usb_ep_to_usb3_ep(_ep);

        usb3_ep->wedge = true;
        return usb3_set_halt(usb3_ep, true, false);
}

static void renesas_usb3_ep_fifo_flush(struct usb_ep *_ep)
{
        struct renesas_usb3_ep *usb3_ep = usb_ep_to_usb3_ep(_ep);
        struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
        unsigned long flags;

        if (usb3_ep->num) {
                spin_lock_irqsave(&usb3->lock, flags);
                if (!usb3_pn_change(usb3, usb3_ep->num)) {
                        usb3_pn_con_clear(usb3);
                        usb3_set_bit(usb3, PN_CON_EN, USB3_PN_CON);
                }
                spin_unlock_irqrestore(&usb3->lock, flags);
        } else {
                usb3_p0_con_clear_buffer(usb3);
        }
}

static struct usb_ep_ops renesas_usb3_ep_ops = {
        .enable         = renesas_usb3_ep_enable,
        .disable        = renesas_usb3_ep_disable,

        .alloc_request  = renesas_usb3_ep_alloc_request,
        .free_request   = renesas_usb3_ep_free_request,

        .queue          = renesas_usb3_ep_queue,
        .dequeue        = renesas_usb3_ep_dequeue,

        .set_halt       = renesas_usb3_ep_set_halt,
        .set_wedge      = renesas_usb3_ep_set_wedge,
        .fifo_flush     = renesas_usb3_ep_fifo_flush,
};

/*------- usb_gadget_ops -------------------------------------------------*/
static int renesas_usb3_start(struct usb_gadget *gadget,
                              struct usb_gadget_driver *driver)
{
        struct renesas_usb3 *usb3;

        if (!driver || driver->max_speed < USB_SPEED_FULL ||
            !driver->setup)
                return -EINVAL;

        usb3 = gadget_to_renesas_usb3(gadget);

        /* hook up the driver */
        usb3->driver = driver;

        pm_runtime_enable(usb3_to_dev(usb3));
        pm_runtime_get_sync(usb3_to_dev(usb3));

        renesas_usb3_init_controller(usb3);

        return 0;
}

static int renesas_usb3_stop(struct usb_gadget *gadget)
{
        struct renesas_usb3 *usb3 = gadget_to_renesas_usb3(gadget);

        usb3->softconnect = false;
        usb3->gadget.speed = USB_SPEED_UNKNOWN;
        usb3->driver = NULL;
        renesas_usb3_stop_controller(usb3);

        pm_runtime_put(usb3_to_dev(usb3));
        pm_runtime_disable(usb3_to_dev(usb3));

        return 0;
}

static int renesas_usb3_get_frame(struct usb_gadget *_gadget)
{
        return -EOPNOTSUPP;
}

static int renesas_usb3_pullup(struct usb_gadget *gadget, int is_on)
{
        struct renesas_usb3 *usb3 = gadget_to_renesas_usb3(gadget);

        usb3->softconnect = !!is_on;

        return 0;
}

static int renesas_usb3_set_selfpowered(struct usb_gadget *gadget, int is_self)
{
        gadget->is_selfpowered = !!is_self;

        return 0;
}

static const struct usb_gadget_ops renesas_usb3_gadget_ops = {
        .get_frame              = renesas_usb3_get_frame,
        .udc_start              = renesas_usb3_start,
        .udc_stop               = renesas_usb3_stop,
        .pullup                 = renesas_usb3_pullup,
        .set_selfpowered        = renesas_usb3_set_selfpowered,
};

static ssize_t role_store(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
{
        struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
        bool new_mode_is_host;

        if (!usb3->driver)
                return -ENODEV;

        if (!strncmp(buf, "host", strlen("host")))
                new_mode_is_host = true;
        else if (!strncmp(buf, "peripheral", strlen("peripheral")))
                new_mode_is_host = false;
        else
                return -EINVAL;

        if (new_mode_is_host == usb3_is_host(usb3))
                return -EINVAL;

        usb3_mode_config(usb3, new_mode_is_host, usb3_is_a_device(usb3));

        return count;
}

static ssize_t role_show(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct renesas_usb3 *usb3 = dev_get_drvdata(dev);

        if (!usb3->driver)
                return -ENODEV;

        return sprintf(buf, "%s\n", usb3_is_host(usb3) ? "host" : "peripheral");
}
static DEVICE_ATTR_RW(role);

/*------- platform_driver ------------------------------------------------*/
static int renesas_usb3_remove(struct platform_device *pdev)
{
        struct renesas_usb3 *usb3 = platform_get_drvdata(pdev);

        device_remove_file(&pdev->dev, &dev_attr_role);

        usb_del_gadget_udc(&usb3->gadget);
        renesas_usb3_dma_free_prd(usb3, &pdev->dev);

        __renesas_usb3_ep_free_request(usb3->ep0_req);

        return 0;
}

static int renesas_usb3_init_ep(struct renesas_usb3 *usb3, struct device *dev,
                                const struct renesas_usb3_priv *priv)
{
        struct renesas_usb3_ep *usb3_ep;
        int i;

        /* calculate num_usb3_eps from renesas_usb3_priv */
        usb3->num_usb3_eps = priv->ramsize_per_ramif * priv->num_ramif * 2 /
                             priv->ramsize_per_pipe + 1;

        if (usb3->num_usb3_eps > USB3_MAX_NUM_PIPES)
                usb3->num_usb3_eps = USB3_MAX_NUM_PIPES;

        usb3->usb3_ep = devm_kzalloc(dev, sizeof(*usb3_ep) * usb3->num_usb3_eps,
                                     GFP_KERNEL);
        if (!usb3->usb3_ep)
                return -ENOMEM;

        dev_dbg(dev, "%s: num_usb3_eps = %d\n", __func__, usb3->num_usb3_eps);
        /*
         * This driver prepares pipes as follows:
         *  - odd pipes = IN pipe
         *  - even pipes = OUT pipe (except pipe 0)
         */
        usb3_for_each_ep(usb3_ep, usb3, i) {
                snprintf(usb3_ep->ep_name, sizeof(usb3_ep->ep_name), "ep%d", i);
                usb3_ep->usb3 = usb3;
                usb3_ep->num = i;
                usb3_ep->ep.name = usb3_ep->ep_name;
                usb3_ep->ep.ops = &renesas_usb3_ep_ops;
                INIT_LIST_HEAD(&usb3_ep->queue);
                INIT_LIST_HEAD(&usb3_ep->ep.ep_list);
                if (!i) {
                        /* for control pipe */
                        usb3->gadget.ep0 = &usb3_ep->ep;
                        usb_ep_set_maxpacket_limit(&usb3_ep->ep,
                                                USB3_EP0_HSFS_MAX_PACKET_SIZE);
                        usb3_ep->ep.caps.type_control = true;
                        usb3_ep->ep.caps.dir_in = true;
                        usb3_ep->ep.caps.dir_out = true;
                        continue;
                }

                /* for bulk or interrupt pipe */
                usb_ep_set_maxpacket_limit(&usb3_ep->ep, ~0);
                list_add_tail(&usb3_ep->ep.ep_list, &usb3->gadget.ep_list);
                usb3_ep->ep.caps.type_bulk = true;
                usb3_ep->ep.caps.type_int = true;
                if (i & 1)
                        usb3_ep->ep.caps.dir_in = true;
                else
                        usb3_ep->ep.caps.dir_out = true;
        }

        return 0;
}

static void renesas_usb3_init_ram(struct renesas_usb3 *usb3, struct device *dev,
                                  const struct renesas_usb3_priv *priv)
{
        struct renesas_usb3_ep *usb3_ep;
        int i;
        u32 ramif[2], basead[2];        /* index 0 = for IN pipes */
        u32 *cur_ramif, *cur_basead;
        u32 val;

        memset(ramif, 0, sizeof(ramif));
        memset(basead, 0, sizeof(basead));

        /*
         * This driver prepares pipes as follows:
         *  - all pipes = the same size as "ramsize_per_pipe"
         * Please refer to the "Method of Specifying RAM Mapping"
         */
        usb3_for_each_ep(usb3_ep, usb3, i) {
                if (!i)
                        continue;       /* out of scope if ep num = 0 */
                if (usb3_ep->ep.caps.dir_in) {
                        cur_ramif = &ramif[0];
                        cur_basead = &basead[0];
                } else {
                        cur_ramif = &ramif[1];
                        cur_basead = &basead[1];
                }

                if (*cur_basead > priv->ramsize_per_ramif)
                        continue;       /* out of memory for IN or OUT pipe */

                /* calculate rammap_val */
                val = PN_RAMMAP_RAMIF(*cur_ramif);
                val |= usb3_calc_ramarea(priv->ramsize_per_pipe);
                val |= PN_RAMMAP_BASEAD(*cur_basead);
                usb3_ep->rammap_val = val;

                dev_dbg(dev, "ep%2d: val = %08x, ramif = %d, base = %x\n",
                        i, val, *cur_ramif, *cur_basead);

                /* update current ramif */
                if (*cur_ramif + 1 == priv->num_ramif) {
                        *cur_ramif = 0;
                        *cur_basead += priv->ramsize_per_pipe;
                } else {
                        (*cur_ramif)++;
                }
        }
}

static const struct renesas_usb3_priv renesas_usb3_priv_r8a7795 = {
        .ramsize_per_ramif = SZ_16K,
        .num_ramif = 2,
        .ramsize_per_pipe = SZ_4K,
        .workaround_for_vbus = true,
};

static const struct of_device_id usb3_of_match[] = {
        {
                .compatible = "renesas,r8a7795-usb3-peri",
                .data = &renesas_usb3_priv_r8a7795,
        },
        { },
};
MODULE_DEVICE_TABLE(of, usb3_of_match);

static const unsigned int renesas_usb3_cable[] = {
        EXTCON_USB,
        EXTCON_USB_HOST,
        EXTCON_NONE,
};

static int renesas_usb3_probe(struct platform_device *pdev)
{
        struct renesas_usb3 *usb3;
        struct resource *res;
        const struct of_device_id *match;
        int irq, ret;
        const struct renesas_usb3_priv *priv;

        match = of_match_node(usb3_of_match, pdev->dev.of_node);
        if (!match)
                return -ENODEV;
        priv = match->data;

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return -ENODEV;

        usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
        if (!usb3)
                return -ENOMEM;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        usb3->reg = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(usb3->reg))
                return PTR_ERR(usb3->reg);

        platform_set_drvdata(pdev, usb3);
        spin_lock_init(&usb3->lock);

        usb3->gadget.ops = &renesas_usb3_gadget_ops;
        usb3->gadget.name = udc_name;
        usb3->gadget.max_speed = USB_SPEED_SUPER;
        INIT_LIST_HEAD(&usb3->gadget.ep_list);
        ret = renesas_usb3_init_ep(usb3, &pdev->dev, priv);
        if (ret < 0)
                return ret;
        renesas_usb3_init_ram(usb3, &pdev->dev, priv);

        ret = devm_request_irq(&pdev->dev, irq, renesas_usb3_irq, 0,
                               dev_name(&pdev->dev), usb3);
        if (ret < 0)
                return ret;

        INIT_WORK(&usb3->extcon_work, renesas_usb3_extcon_work);
        usb3->extcon = devm_extcon_dev_allocate(&pdev->dev, renesas_usb3_cable);
        if (IS_ERR(usb3->extcon))
                return PTR_ERR(usb3->extcon);

        ret = devm_extcon_dev_register(&pdev->dev, usb3->extcon);
        if (ret < 0) {
                dev_err(&pdev->dev, "Failed to register extcon\n");
                return ret;
        }

        /* for ep0 handling */
        usb3->ep0_req = __renesas_usb3_ep_alloc_request(GFP_KERNEL);
        if (!usb3->ep0_req)
                return -ENOMEM;

        ret = renesas_usb3_dma_alloc_prd(usb3, &pdev->dev);
        if (ret < 0)
                goto err_alloc_prd;

        ret = usb_add_gadget_udc(&pdev->dev, &usb3->gadget);
        if (ret < 0)
                goto err_add_udc;

        ret = device_create_file(&pdev->dev, &dev_attr_role);
        if (ret < 0)
                goto err_dev_create;

        usb3->workaround_for_vbus = priv->workaround_for_vbus;

        dev_info(&pdev->dev, "probed\n");

        return 0;

err_dev_create:
        usb_del_gadget_udc(&usb3->gadget);

err_add_udc:
        renesas_usb3_dma_free_prd(usb3, &pdev->dev);

err_alloc_prd:
        __renesas_usb3_ep_free_request(usb3->ep0_req);

        return ret;
}

static struct platform_driver renesas_usb3_driver = {
        .probe          = renesas_usb3_probe,
        .remove         = renesas_usb3_remove,
        .driver         = {
                .name = (char *)udc_name,
                .of_match_table = of_match_ptr(usb3_of_match),
        },
};
module_platform_driver(renesas_usb3_driver);

MODULE_DESCRIPTION("Renesas USB3.0 Peripheral driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
MODULE_ALIAS("platform:renesas_usb3");