/*
 * Copyright (C) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
 * Copyright (C) 2014 Marek Vasut <marex@denx.de>
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <usb.h>
#include <malloc.h>
#include <memalign.h>
#include <phys2bus.h>
#include <usbroothubdes.h>
#include <wait_bit.h>
#include <asm/io.h>
#include <power/regulator.h>

#include "dwc2.h"

DECLARE_GLOBAL_DATA_PTR;

/* Use only HC channel 0. */
#define DWC2_HC_CHANNEL                 0

#define DWC2_STATUS_BUF_SIZE            64
#define DWC2_DATA_BUF_SIZE              (64 * 1024)

#define MAX_DEVICE                      16
#define MAX_ENDPOINT                    16

struct dwc2_priv {
#ifdef CONFIG_DM_USB
        uint8_t aligned_buffer[DWC2_DATA_BUF_SIZE] __aligned(ARCH_DMA_MINALIGN);
        uint8_t status_buffer[DWC2_STATUS_BUF_SIZE] __aligned(ARCH_DMA_MINALIGN);
#else
        uint8_t *aligned_buffer;
        uint8_t *status_buffer;
#endif
        u8 in_data_toggle[MAX_DEVICE][MAX_ENDPOINT];
        u8 out_data_toggle[MAX_DEVICE][MAX_ENDPOINT];
        struct dwc2_core_regs *regs;
        int root_hub_devnum;
        bool ext_vbus;
        /*
         * The hnp/srp capability must be disabled if the platform
         * does't support hnp/srp. Otherwise the force mode can't work.
         */
        bool hnp_srp_disable;
        bool oc_disable;
};

#ifndef CONFIG_DM_USB
/* We need cacheline-aligned buffers for DMA transfers and dcache support */
DEFINE_ALIGN_BUFFER(uint8_t, aligned_buffer_addr, DWC2_DATA_BUF_SIZE,
                ARCH_DMA_MINALIGN);
DEFINE_ALIGN_BUFFER(uint8_t, status_buffer_addr, DWC2_STATUS_BUF_SIZE,
                ARCH_DMA_MINALIGN);

static struct dwc2_priv local;
#endif

/*
 * DWC2 IP interface
 */

/*
 * Initializes the FSLSPClkSel field of the HCFG register
 * depending on the PHY type.
 */
static void init_fslspclksel(struct dwc2_core_regs *regs)
{
        uint32_t phyclk;

#if (CONFIG_DWC2_PHY_TYPE == DWC2_PHY_TYPE_FS)
        phyclk = DWC2_HCFG_FSLSPCLKSEL_48_MHZ;  /* Full speed PHY */
#else
        /* High speed PHY running at full speed or high speed */
        phyclk = DWC2_HCFG_FSLSPCLKSEL_30_60_MHZ;
#endif

#ifdef CONFIG_DWC2_ULPI_FS_LS
        uint32_t hwcfg2 = readl(&regs->ghwcfg2);
        uint32_t hval = (ghwcfg2 & DWC2_HWCFG2_HS_PHY_TYPE_MASK) >>
                        DWC2_HWCFG2_HS_PHY_TYPE_OFFSET;
        uint32_t fval = (ghwcfg2 & DWC2_HWCFG2_FS_PHY_TYPE_MASK) >>
                        DWC2_HWCFG2_FS_PHY_TYPE_OFFSET;

        if (hval == 2 && fval == 1)
                phyclk = DWC2_HCFG_FSLSPCLKSEL_48_MHZ;  /* Full speed PHY */
#endif

        clrsetbits_le32(&regs->host_regs.hcfg,
                        DWC2_HCFG_FSLSPCLKSEL_MASK,
                        phyclk << DWC2_HCFG_FSLSPCLKSEL_OFFSET);
}

/*
 * Flush a Tx FIFO.
 *
 * @param regs Programming view of DWC_otg controller.
 * @param num Tx FIFO to flush.
 */
static void dwc_otg_flush_tx_fifo(struct dwc2_core_regs *regs, const int num)
{
        int ret;

        writel(DWC2_GRSTCTL_TXFFLSH | (num << DWC2_GRSTCTL_TXFNUM_OFFSET),
               &regs->grstctl);
        ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_TXFFLSH,
                           false, 1000, false);
        if (ret)
                printf("%s: Timeout!\n", __func__);

        /* Wait for 3 PHY Clocks */
        udelay(1);
}

/*
 * Flush Rx FIFO.
 *
 * @param regs Programming view of DWC_otg controller.
 */
static void dwc_otg_flush_rx_fifo(struct dwc2_core_regs *regs)
{
        int ret;

        writel(DWC2_GRSTCTL_RXFFLSH, &regs->grstctl);
        ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_RXFFLSH,
                           false, 1000, false);
        if (ret)
                printf("%s: Timeout!\n", __func__);

        /* Wait for 3 PHY Clocks */
        udelay(1);
}

/*
 * Do core a soft reset of the core.  Be careful with this because it
 * resets all the internal state machines of the core.
 */
static void dwc_otg_core_reset(struct dwc2_core_regs *regs)
{
        int ret;

        /* Wait for AHB master IDLE state. */
        ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_AHBIDLE,
                           true, 1000, false);
        if (ret)
                printf("%s: Timeout!\n", __func__);

        /* Core Soft Reset */
        writel(DWC2_GRSTCTL_CSFTRST, &regs->grstctl);
        ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_CSFTRST,
                           false, 1000, false);
        if (ret)
                printf("%s: Timeout!\n", __func__);

        /*
         * Wait for core to come out of reset.
         * NOTE: This long sleep is _very_ important, otherwise the core will
         *       not stay in host mode after a connector ID change!
         */
        mdelay(100);
}

#if defined(CONFIG_DM_USB) && defined(CONFIG_DM_REGULATOR)
static int dwc_vbus_supply_init(struct udevice *dev)
{
        struct udevice *vbus_supply;
        int ret;

        ret = device_get_supply_regulator(dev, "vbus-supply", &vbus_supply);
        if (ret) {
                debug("%s: No vbus supply\n", dev->name);
                return 0;
        }

        ret = regulator_set_enable(vbus_supply, true);
        if (ret) {
                pr_err("Error enabling vbus supply\n");
                return ret;
        }

        return 0;
}
#else
static int dwc_vbus_supply_init(struct udevice *dev)
{
        return 0;
}
#endif

/*
 * This function initializes the DWC_otg controller registers for
 * host mode.
 *
 * This function flushes the Tx and Rx FIFOs and it flushes any entries in the
 * request queues. Host channels are reset to ensure that they are ready for
 * performing transfers.
 *
 * @param dev USB Device (NULL if driver model is not being used)
 * @param regs Programming view of DWC_otg controller
 *
 */
static void dwc_otg_core_host_init(struct udevice *dev,
                                   struct dwc2_core_regs *regs)
{
        uint32_t nptxfifosize = 0;
        uint32_t ptxfifosize = 0;
        uint32_t hprt0 = 0;
        int i, ret, num_channels;

        /* Restart the Phy Clock */
        writel(0, &regs->pcgcctl);

        /* Initialize Host Configuration Register */
        init_fslspclksel(regs);
#ifdef CONFIG_DWC2_DFLT_SPEED_FULL
        setbits_le32(&regs->host_regs.hcfg, DWC2_HCFG_FSLSSUPP);
#endif

        /* Configure data FIFO sizes */
#ifdef CONFIG_DWC2_ENABLE_DYNAMIC_FIFO
        if (readl(&regs->ghwcfg2) & DWC2_HWCFG2_DYNAMIC_FIFO) {
                /* Rx FIFO */
                writel(CONFIG_DWC2_HOST_RX_FIFO_SIZE, &regs->grxfsiz);

                /* Non-periodic Tx FIFO */
                nptxfifosize |= CONFIG_DWC2_HOST_NPERIO_TX_FIFO_SIZE <<
                                DWC2_FIFOSIZE_DEPTH_OFFSET;
                nptxfifosize |= CONFIG_DWC2_HOST_RX_FIFO_SIZE <<
                                DWC2_FIFOSIZE_STARTADDR_OFFSET;
                writel(nptxfifosize, &regs->gnptxfsiz);

                /* Periodic Tx FIFO */
                ptxfifosize |= CONFIG_DWC2_HOST_PERIO_TX_FIFO_SIZE <<
                                DWC2_FIFOSIZE_DEPTH_OFFSET;
                ptxfifosize |= (CONFIG_DWC2_HOST_RX_FIFO_SIZE +
                                CONFIG_DWC2_HOST_NPERIO_TX_FIFO_SIZE) <<
                                DWC2_FIFOSIZE_STARTADDR_OFFSET;
                writel(ptxfifosize, &regs->hptxfsiz);
        }
#endif

        /* Clear Host Set HNP Enable in the OTG Control Register */
        clrbits_le32(&regs->gotgctl, DWC2_GOTGCTL_HSTSETHNPEN);

        /* Make sure the FIFOs are flushed. */
        dwc_otg_flush_tx_fifo(regs, 0x10);      /* All Tx FIFOs */
        dwc_otg_flush_rx_fifo(regs);

        /* Flush out any leftover queued requests. */
        num_channels = readl(&regs->ghwcfg2);
        num_channels &= DWC2_HWCFG2_NUM_HOST_CHAN_MASK;
        num_channels >>= DWC2_HWCFG2_NUM_HOST_CHAN_OFFSET;
        num_channels += 1;

        for (i = 0; i < num_channels; i++)
                clrsetbits_le32(&regs->hc_regs[i].hcchar,
                                DWC2_HCCHAR_CHEN | DWC2_HCCHAR_EPDIR,
                                DWC2_HCCHAR_CHDIS);

        /* Halt all channels to put them into a known state. */
        for (i = 0; i < num_channels; i++) {
                clrsetbits_le32(&regs->hc_regs[i].hcchar,
                                DWC2_HCCHAR_EPDIR,
                                DWC2_HCCHAR_CHEN | DWC2_HCCHAR_CHDIS);
                ret = wait_for_bit(__func__, &regs->hc_regs[i].hcchar,
                                   DWC2_HCCHAR_CHEN, false, 1000, false);
                if (ret)
                        printf("%s: Timeout!\n", __func__);
        }

        /* Turn on the vbus power. */
        if (readl(&regs->gintsts) & DWC2_GINTSTS_CURMODE_HOST) {
                hprt0 = readl(&regs->hprt0);
                hprt0 &= ~(DWC2_HPRT0_PRTENA | DWC2_HPRT0_PRTCONNDET);
                hprt0 &= ~(DWC2_HPRT0_PRTENCHNG | DWC2_HPRT0_PRTOVRCURRCHNG);
                if (!(hprt0 & DWC2_HPRT0_PRTPWR)) {
                        hprt0 |= DWC2_HPRT0_PRTPWR;
                        writel(hprt0, &regs->hprt0);
                }
        }

        if (dev)
                dwc_vbus_supply_init(dev);
}

/*
 * This function initializes the DWC_otg controller registers and
 * prepares the core for device mode or host mode operation.
 *
 * @param regs Programming view of the DWC_otg controller
 */
static void dwc_otg_core_init(struct dwc2_priv *priv)
{
        struct dwc2_core_regs *regs = priv->regs;
        uint32_t ahbcfg = 0;
        uint32_t usbcfg = 0;
        uint8_t brst_sz = CONFIG_DWC2_DMA_BURST_SIZE;

        /* Common Initialization */
        usbcfg = readl(&regs->gusbcfg);

        /* Program the ULPI External VBUS bit if needed */
        if (priv->ext_vbus) {
                usbcfg |= DWC2_GUSBCFG_ULPI_EXT_VBUS_DRV;
                if (!priv->oc_disable) {
                        usbcfg |= DWC2_GUSBCFG_ULPI_INT_VBUS_INDICATOR |
                                  DWC2_GUSBCFG_INDICATOR_PASSTHROUGH;
                }
        } else {
                usbcfg &= ~DWC2_GUSBCFG_ULPI_EXT_VBUS_DRV;
        }

        /* Set external TS Dline pulsing */
#ifdef CONFIG_DWC2_TS_DLINE
        usbcfg |= DWC2_GUSBCFG_TERM_SEL_DL_PULSE;
#else
        usbcfg &= ~DWC2_GUSBCFG_TERM_SEL_DL_PULSE;
#endif
        writel(usbcfg, &regs->gusbcfg);

        /* Reset the Controller */
        dwc_otg_core_reset(regs);

        /*
         * This programming sequence needs to happen in FS mode before
         * any other programming occurs
         */
#if defined(CONFIG_DWC2_DFLT_SPEED_FULL) && \
        (CONFIG_DWC2_PHY_TYPE == DWC2_PHY_TYPE_FS)
        /* If FS mode with FS PHY */
        setbits_le32(&regs->gusbcfg, DWC2_GUSBCFG_PHYSEL);

        /* Reset after a PHY select */
        dwc_otg_core_reset(regs);

        /*
         * Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS.
         * Also do this on HNP Dev/Host mode switches (done in dev_init
         * and host_init).
         */
        if (readl(&regs->gintsts) & DWC2_GINTSTS_CURMODE_HOST)
                init_fslspclksel(regs);

#ifdef CONFIG_DWC2_I2C_ENABLE
        /* Program GUSBCFG.OtgUtmifsSel to I2C */
        setbits_le32(&regs->gusbcfg, DWC2_GUSBCFG_OTGUTMIFSSEL);

        /* Program GI2CCTL.I2CEn */
        clrsetbits_le32(&regs->gi2cctl, DWC2_GI2CCTL_I2CEN |
                        DWC2_GI2CCTL_I2CDEVADDR_MASK,
                        1 << DWC2_GI2CCTL_I2CDEVADDR_OFFSET);
        setbits_le32(&regs->gi2cctl, DWC2_GI2CCTL_I2CEN);
#endif

#else
        /* High speed PHY. */

        /*
         * HS PHY parameters. These parameters are preserved during
         * soft reset so only program the first time. Do a soft reset
         * immediately after setting phyif.
         */
        usbcfg &= ~(DWC2_GUSBCFG_ULPI_UTMI_SEL | DWC2_GUSBCFG_PHYIF);
        usbcfg |= CONFIG_DWC2_PHY_TYPE << DWC2_GUSBCFG_ULPI_UTMI_SEL_OFFSET;

        if (usbcfg & DWC2_GUSBCFG_ULPI_UTMI_SEL) {      /* ULPI interface */
#ifdef CONFIG_DWC2_PHY_ULPI_DDR
                usbcfg |= DWC2_GUSBCFG_DDRSEL;
#else
                usbcfg &= ~DWC2_GUSBCFG_DDRSEL;
#endif
        } else {        /* UTMI+ interface */
#if (CONFIG_DWC2_UTMI_PHY_WIDTH == 16)
                usbcfg |= DWC2_GUSBCFG_PHYIF;
#endif
        }

        writel(usbcfg, &regs->gusbcfg);

        /* Reset after setting the PHY parameters */
        dwc_otg_core_reset(regs);
#endif

        usbcfg = readl(&regs->gusbcfg);
        usbcfg &= ~(DWC2_GUSBCFG_ULPI_FSLS | DWC2_GUSBCFG_ULPI_CLK_SUS_M);
#ifdef CONFIG_DWC2_ULPI_FS_LS
        uint32_t hwcfg2 = readl(&regs->ghwcfg2);
        uint32_t hval = (ghwcfg2 & DWC2_HWCFG2_HS_PHY_TYPE_MASK) >>
                        DWC2_HWCFG2_HS_PHY_TYPE_OFFSET;
        uint32_t fval = (ghwcfg2 & DWC2_HWCFG2_FS_PHY_TYPE_MASK) >>
                        DWC2_HWCFG2_FS_PHY_TYPE_OFFSET;
        if (hval == 2 && fval == 1) {
                usbcfg |= DWC2_GUSBCFG_ULPI_FSLS;
                usbcfg |= DWC2_GUSBCFG_ULPI_CLK_SUS_M;
        }
#endif
        if (priv->hnp_srp_disable)
                usbcfg |= DWC2_GUSBCFG_FORCEHOSTMODE;

        writel(usbcfg, &regs->gusbcfg);

        /* Program the GAHBCFG Register. */
        switch (readl(&regs->ghwcfg2) & DWC2_HWCFG2_ARCHITECTURE_MASK) {
        case DWC2_HWCFG2_ARCHITECTURE_SLAVE_ONLY:
                break;
        case DWC2_HWCFG2_ARCHITECTURE_EXT_DMA:
                while (brst_sz > 1) {
                        ahbcfg |= ahbcfg + (1 << DWC2_GAHBCFG_HBURSTLEN_OFFSET);
                        ahbcfg &= DWC2_GAHBCFG_HBURSTLEN_MASK;
                        brst_sz >>= 1;
                }

#ifdef CONFIG_DWC2_DMA_ENABLE
                ahbcfg |= DWC2_GAHBCFG_DMAENABLE;
#endif
                break;

        case DWC2_HWCFG2_ARCHITECTURE_INT_DMA:
                ahbcfg |= DWC2_GAHBCFG_HBURSTLEN_INCR4;
#ifdef CONFIG_DWC2_DMA_ENABLE
                ahbcfg |= DWC2_GAHBCFG_DMAENABLE;
#endif
                break;
        }

        writel(ahbcfg, &regs->gahbcfg);

        /* Program the capabilities in GUSBCFG Register */
        usbcfg = 0;

        if (!priv->hnp_srp_disable)
                usbcfg |= DWC2_GUSBCFG_HNPCAP | DWC2_GUSBCFG_SRPCAP;
#ifdef CONFIG_DWC2_IC_USB_CAP
        usbcfg |= DWC2_GUSBCFG_IC_USB_CAP;
#endif

        setbits_le32(&regs->gusbcfg, usbcfg);
}

/*
 * Prepares a host channel for transferring packets to/from a specific
 * endpoint. The HCCHARn register is set up with the characteristics specified
 * in _hc. Host channel interrupts that may need to be serviced while this
 * transfer is in progress are enabled.
 *
 * @param regs Programming view of DWC_otg controller
 * @param hc Information needed to initialize the host channel
 */
static void dwc_otg_hc_init(struct dwc2_core_regs *regs, uint8_t hc_num,
                struct usb_device *dev, uint8_t dev_addr, uint8_t ep_num,
                uint8_t ep_is_in, uint8_t ep_type, uint16_t max_packet)
{
        struct dwc2_hc_regs *hc_regs = &regs->hc_regs[hc_num];
        uint32_t hcchar = (dev_addr << DWC2_HCCHAR_DEVADDR_OFFSET) |
                          (ep_num << DWC2_HCCHAR_EPNUM_OFFSET) |
                          (ep_is_in << DWC2_HCCHAR_EPDIR_OFFSET) |
                          (ep_type << DWC2_HCCHAR_EPTYPE_OFFSET) |
                          (max_packet << DWC2_HCCHAR_MPS_OFFSET);

        if (dev->speed == USB_SPEED_LOW)
                hcchar |= DWC2_HCCHAR_LSPDDEV;

        /*
         * Program the HCCHARn register with the endpoint characteristics
         * for the current transfer.
         */
        writel(hcchar, &hc_regs->hcchar);

        /* Program the HCSPLIT register, default to no SPLIT */
        writel(0, &hc_regs->hcsplt);
}

static void dwc_otg_hc_init_split(struct dwc2_hc_regs *hc_regs,
                                  uint8_t hub_devnum, uint8_t hub_port)
{
        uint32_t hcsplt = 0;

        hcsplt = DWC2_HCSPLT_SPLTENA;
        hcsplt |= hub_devnum << DWC2_HCSPLT_HUBADDR_OFFSET;
        hcsplt |= hub_port << DWC2_HCSPLT_PRTADDR_OFFSET;

        /* Program the HCSPLIT register for SPLITs */
        writel(hcsplt, &hc_regs->hcsplt);
}

/*
 * DWC2 to USB API interface
 */
/* Direction: In ; Request: Status */
static int dwc_otg_submit_rh_msg_in_status(struct dwc2_core_regs *regs,
                                           struct usb_device *dev, void *buffer,
                                           int txlen, struct devrequest *cmd)
{
        uint32_t hprt0 = 0;
        uint32_t port_status = 0;
        uint32_t port_change = 0;
        int len = 0;
        int stat = 0;

        switch (cmd->requesttype & ~USB_DIR_IN) {
        case 0:
                *(uint16_t *)buffer = cpu_to_le16(1);
                len = 2;
                break;
        case USB_RECIP_INTERFACE:
        case USB_RECIP_ENDPOINT:
                *(uint16_t *)buffer = cpu_to_le16(0);
                len = 2;
                break;
        case USB_TYPE_CLASS:
                *(uint32_t *)buffer = cpu_to_le32(0);
                len = 4;
                break;
        case USB_RECIP_OTHER | USB_TYPE_CLASS:
                hprt0 = readl(&regs->hprt0);
                if (hprt0 & DWC2_HPRT0_PRTCONNSTS)
                        port_status |= USB_PORT_STAT_CONNECTION;
                if (hprt0 & DWC2_HPRT0_PRTENA)
                        port_status |= USB_PORT_STAT_ENABLE;
                if (hprt0 & DWC2_HPRT0_PRTSUSP)
                        port_status |= USB_PORT_STAT_SUSPEND;
                if (hprt0 & DWC2_HPRT0_PRTOVRCURRACT)
                        port_status |= USB_PORT_STAT_OVERCURRENT;
                if (hprt0 & DWC2_HPRT0_PRTRST)
                        port_status |= USB_PORT_STAT_RESET;
                if (hprt0 & DWC2_HPRT0_PRTPWR)
                        port_status |= USB_PORT_STAT_POWER;

                if ((hprt0 & DWC2_HPRT0_PRTSPD_MASK) == DWC2_HPRT0_PRTSPD_LOW)
                        port_status |= USB_PORT_STAT_LOW_SPEED;
                else if ((hprt0 & DWC2_HPRT0_PRTSPD_MASK) ==
                         DWC2_HPRT0_PRTSPD_HIGH)
                        port_status |= USB_PORT_STAT_HIGH_SPEED;

                if (hprt0 & DWC2_HPRT0_PRTENCHNG)
                        port_change |= USB_PORT_STAT_C_ENABLE;
                if (hprt0 & DWC2_HPRT0_PRTCONNDET)
                        port_change |= USB_PORT_STAT_C_CONNECTION;
                if (hprt0 & DWC2_HPRT0_PRTOVRCURRCHNG)
                        port_change |= USB_PORT_STAT_C_OVERCURRENT;

                *(uint32_t *)buffer = cpu_to_le32(port_status |
                                        (port_change << 16));
                len = 4;
                break;
        default:
                puts("unsupported root hub command\n");
                stat = USB_ST_STALLED;
        }

        dev->act_len = min(len, txlen);
        dev->status = stat;

        return stat;
}

/* Direction: In ; Request: Descriptor */
static int dwc_otg_submit_rh_msg_in_descriptor(struct usb_device *dev,
                                               void *buffer, int txlen,
                                               struct devrequest *cmd)
{
        unsigned char data[32];
        uint32_t dsc;
        int len = 0;
        int stat = 0;
        uint16_t wValue = cpu_to_le16(cmd->value);
        uint16_t wLength = cpu_to_le16(cmd->length);

        switch (cmd->requesttype & ~USB_DIR_IN) {
        case 0:
                switch (wValue & 0xff00) {
                case 0x0100:    /* device descriptor */
                        len = min3(txlen, (int)sizeof(root_hub_dev_des), (int)wLength);
                        memcpy(buffer, root_hub_dev_des, len);
                        break;
                case 0x0200:    /* configuration descriptor */
                        len = min3(txlen, (int)sizeof(root_hub_config_des), (int)wLength);
                        memcpy(buffer, root_hub_config_des, len);
                        break;
                case 0x0300:    /* string descriptors */
                        switch (wValue & 0xff) {
                        case 0x00:
                                len = min3(txlen, (int)sizeof(root_hub_str_index0),
                                           (int)wLength);
                                memcpy(buffer, root_hub_str_index0, len);
                                break;
                        case 0x01:
                                len = min3(txlen, (int)sizeof(root_hub_str_index1),
                                           (int)wLength);
                                memcpy(buffer, root_hub_str_index1, len);
                                break;
                        }
                        break;
                default:
                        stat = USB_ST_STALLED;
                }
                break;

        case USB_TYPE_CLASS:
                /* Root port config, set 1 port and nothing else. */
                dsc = 0x00000001;

                data[0] = 9;            /* min length; */
                data[1] = 0x29;
                data[2] = dsc & RH_A_NDP;
                data[3] = 0;
                if (dsc & RH_A_PSM)
                        data[3] |= 0x1;
                if (dsc & RH_A_NOCP)
                        data[3] |= 0x10;
                else if (dsc & RH_A_OCPM)
                        data[3] |= 0x8;

                /* corresponds to data[4-7] */
                data[5] = (dsc & RH_A_POTPGT) >> 24;
                data[7] = dsc & RH_B_DR;
                if (data[2] < 7) {
                        data[8] = 0xff;
                } else {
                        data[0] += 2;
                        data[8] = (dsc & RH_B_DR) >> 8;
                        data[9] = 0xff;
                        data[10] = data[9];
                }

                len = min3(txlen, (int)data[0], (int)wLength);
                memcpy(buffer, data, len);
                break;
        default:
                puts("unsupported root hub command\n");
                stat = USB_ST_STALLED;
        }

        dev->act_len = min(len, txlen);
        dev->status = stat;

        return stat;
}

/* Direction: In ; Request: Configuration */
static int dwc_otg_submit_rh_msg_in_configuration(struct usb_device *dev,
                                                  void *buffer, int txlen,
                                                  struct devrequest *cmd)
{
        int len = 0;
        int stat = 0;

        switch (cmd->requesttype & ~USB_DIR_IN) {
        case 0:
                *(uint8_t *)buffer = 0x01;
                len = 1;
                break;
        default:
                puts("unsupported root hub command\n");
                stat = USB_ST_STALLED;
        }

        dev->act_len = min(len, txlen);
        dev->status = stat;

        return stat;
}

/* Direction: In */
static int dwc_otg_submit_rh_msg_in(struct dwc2_priv *priv,
                                    struct usb_device *dev, void *buffer,
                                    int txlen, struct devrequest *cmd)
{
        switch (cmd->request) {
        case USB_REQ_GET_STATUS:
                return dwc_otg_submit_rh_msg_in_status(priv->regs, dev, buffer,
                                                       txlen, cmd);
        case USB_REQ_GET_DESCRIPTOR:
                return dwc_otg_submit_rh_msg_in_descriptor(dev, buffer,
                                                           txlen, cmd);
        case USB_REQ_GET_CONFIGURATION:
                return dwc_otg_submit_rh_msg_in_configuration(dev, buffer,
                                                              txlen, cmd);
        default:
                puts("unsupported root hub command\n");
                return USB_ST_STALLED;
        }
}

/* Direction: Out */
static int dwc_otg_submit_rh_msg_out(struct dwc2_priv *priv,
                                     struct usb_device *dev,
                                     void *buffer, int txlen,
                                     struct devrequest *cmd)
{
        struct dwc2_core_regs *regs = priv->regs;
        int len = 0;
        int stat = 0;
        uint16_t bmrtype_breq = cmd->requesttype | (cmd->request << 8);
        uint16_t wValue = cpu_to_le16(cmd->value);

        switch (bmrtype_breq & ~USB_DIR_IN) {
        case (USB_REQ_CLEAR_FEATURE << 8) | USB_RECIP_ENDPOINT:
        case (USB_REQ_CLEAR_FEATURE << 8) | USB_TYPE_CLASS:
                break;

        case (USB_REQ_CLEAR_FEATURE << 8) | USB_RECIP_OTHER | USB_TYPE_CLASS:
                switch (wValue) {
                case USB_PORT_FEAT_C_CONNECTION:
                        setbits_le32(&regs->hprt0, DWC2_HPRT0_PRTCONNDET);
                        break;
                }
                break;

        case (USB_REQ_SET_FEATURE << 8) | USB_RECIP_OTHER | USB_TYPE_CLASS:
                switch (wValue) {
                case USB_PORT_FEAT_SUSPEND:
                        break;

                case USB_PORT_FEAT_RESET:
                        clrsetbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA |
                                        DWC2_HPRT0_PRTCONNDET |
                                        DWC2_HPRT0_PRTENCHNG |
                                        DWC2_HPRT0_PRTOVRCURRCHNG,
                                        DWC2_HPRT0_PRTRST);
                        mdelay(50);
                        clrbits_le32(&regs->hprt0, DWC2_HPRT0_PRTRST);
                        break;

                case USB_PORT_FEAT_POWER:
                        clrsetbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA |
                                        DWC2_HPRT0_PRTCONNDET |
                                        DWC2_HPRT0_PRTENCHNG |
                                        DWC2_HPRT0_PRTOVRCURRCHNG,
                                        DWC2_HPRT0_PRTRST);
                        break;

                case USB_PORT_FEAT_ENABLE:
                        break;
                }
                break;
        case (USB_REQ_SET_ADDRESS << 8):
                priv->root_hub_devnum = wValue;
                break;
        case (USB_REQ_SET_CONFIGURATION << 8):
                break;
        default:
                puts("unsupported root hub command\n");
                stat = USB_ST_STALLED;
        }

        len = min(len, txlen);

        dev->act_len = len;
        dev->status = stat;

        return stat;
}

static int dwc_otg_submit_rh_msg(struct dwc2_priv *priv, struct usb_device *dev,
                                 unsigned long pipe, void *buffer, int txlen,
                                 struct devrequest *cmd)
{
        int stat = 0;

        if (usb_pipeint(pipe)) {
                puts("Root-Hub submit IRQ: NOT implemented\n");
                return 0;
        }

        if (cmd->requesttype & USB_DIR_IN)
                stat = dwc_otg_submit_rh_msg_in(priv, dev, buffer, txlen, cmd);
        else
                stat = dwc_otg_submit_rh_msg_out(priv, dev, buffer, txlen, cmd);

        mdelay(1);

        return stat;
}

int wait_for_chhltd(struct dwc2_hc_regs *hc_regs, uint32_t *sub, u8 *toggle)
{
        int ret;
        uint32_t hcint, hctsiz;

        ret = wait_for_bit(__func__, &hc_regs->hcint, DWC2_HCINT_CHHLTD, true,
                           1000, false);
        if (ret)
                return ret;

        hcint = readl(&hc_regs->hcint);
        hctsiz = readl(&hc_regs->hctsiz);
        *sub = (hctsiz & DWC2_HCTSIZ_XFERSIZE_MASK) >>
                DWC2_HCTSIZ_XFERSIZE_OFFSET;
        *toggle = (hctsiz & DWC2_HCTSIZ_PID_MASK) >> DWC2_HCTSIZ_PID_OFFSET;

        debug("%s: HCINT=%08x sub=%u toggle=%d\n", __func__, hcint, *sub,
              *toggle);

        if (hcint & DWC2_HCINT_XFERCOMP)
                return 0;

        if (hcint & (DWC2_HCINT_NAK | DWC2_HCINT_FRMOVRUN))
                return -EAGAIN;

        debug("%s: Error (HCINT=%08x)\n", __func__, hcint);
        return -EINVAL;
}

static int dwc2_eptype[] = {
        DWC2_HCCHAR_EPTYPE_ISOC,
        DWC2_HCCHAR_EPTYPE_INTR,
        DWC2_HCCHAR_EPTYPE_CONTROL,
        DWC2_HCCHAR_EPTYPE_BULK,
};

static int transfer_chunk(struct dwc2_hc_regs *hc_regs, void *aligned_buffer,
                          u8 *pid, int in, void *buffer, int num_packets,
                          int xfer_len, int *actual_len, int odd_frame)
{
        int ret = 0;
        uint32_t sub;

        debug("%s: chunk: pid %d xfer_len %u pkts %u\n", __func__,
              *pid, xfer_len, num_packets);

        writel((xfer_len << DWC2_HCTSIZ_XFERSIZE_OFFSET) |
               (num_packets << DWC2_HCTSIZ_PKTCNT_OFFSET) |
               (*pid << DWC2_HCTSIZ_PID_OFFSET),
               &hc_regs->hctsiz);

        if (xfer_len) {
                if (in) {
                        invalidate_dcache_range(
                                        (uintptr_t)aligned_buffer,
                                        (uintptr_t)aligned_buffer +
                                        roundup(xfer_len, ARCH_DMA_MINALIGN));
                } else {
                        memcpy(aligned_buffer, buffer, xfer_len);
                        flush_dcache_range(
                                        (uintptr_t)aligned_buffer,
                                        (uintptr_t)aligned_buffer +
                                        roundup(xfer_len, ARCH_DMA_MINALIGN));
                }
        }

        writel(phys_to_bus((unsigned long)aligned_buffer), &hc_regs->hcdma);

        /* Clear old interrupt conditions for this host channel. */
        writel(0x3fff, &hc_regs->hcint);

        /* Set host channel enable after all other setup is complete. */
        clrsetbits_le32(&hc_regs->hcchar, DWC2_HCCHAR_MULTICNT_MASK |
                        DWC2_HCCHAR_CHEN | DWC2_HCCHAR_CHDIS |
                        DWC2_HCCHAR_ODDFRM,
                        (1 << DWC2_HCCHAR_MULTICNT_OFFSET) |
                        (odd_frame << DWC2_HCCHAR_ODDFRM_OFFSET) |
                        DWC2_HCCHAR_CHEN);

        ret = wait_for_chhltd(hc_regs, &sub, pid);
        if (ret < 0)
                return ret;

        if (in) {
                xfer_len -= sub;

                invalidate_dcache_range((unsigned long)aligned_buffer,
                                        (unsigned long)aligned_buffer +
                                        roundup(xfer_len, ARCH_DMA_MINALIGN));

                memcpy(buffer, aligned_buffer, xfer_len);
        }
        *actual_len = xfer_len;

        return ret;
}

int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
              unsigned long pipe, u8 *pid, int in, void *buffer, int len)
{
        struct dwc2_core_regs *regs = priv->regs;
        struct dwc2_hc_regs *hc_regs = &regs->hc_regs[DWC2_HC_CHANNEL];
        struct dwc2_host_regs *host_regs = &regs->host_regs;
        int devnum = usb_pipedevice(pipe);
        int ep = usb_pipeendpoint(pipe);
        int max = usb_maxpacket(dev, pipe);
        int eptype = dwc2_eptype[usb_pipetype(pipe)];
        int done = 0;
        int ret = 0;
        int do_split = 0;
        int complete_split = 0;
        uint32_t xfer_len;
        uint32_t num_packets;
        int stop_transfer = 0;
        uint32_t max_xfer_len;
        int ssplit_frame_num = 0;

        debug("%s: msg: pipe %lx pid %d in %d len %d\n", __func__, pipe, *pid,
              in, len);

        max_xfer_len = CONFIG_DWC2_MAX_PACKET_COUNT * max;
        if (max_xfer_len > CONFIG_DWC2_MAX_TRANSFER_SIZE)
                max_xfer_len = CONFIG_DWC2_MAX_TRANSFER_SIZE;
        if (max_xfer_len > DWC2_DATA_BUF_SIZE)
                max_xfer_len = DWC2_DATA_BUF_SIZE;

        /* Make sure that max_xfer_len is a multiple of max packet size. */
        num_packets = max_xfer_len / max;
        max_xfer_len = num_packets * max;

        /* Initialize channel */
        dwc_otg_hc_init(regs, DWC2_HC_CHANNEL, dev, devnum, ep, in,
                        eptype, max);

        /* Check if the target is a FS/LS device behind a HS hub */
        if (dev->speed != USB_SPEED_HIGH) {
                uint8_t hub_addr;
                uint8_t hub_port;
                uint32_t hprt0 = readl(&regs->hprt0);
                if ((hprt0 & DWC2_HPRT0_PRTSPD_MASK) ==
                     DWC2_HPRT0_PRTSPD_HIGH) {
                        usb_find_usb2_hub_address_port(dev, &hub_addr,
                                                       &hub_port);
                        dwc_otg_hc_init_split(hc_regs, hub_addr, hub_port);

                        do_split = 1;
                        num_packets = 1;
                        max_xfer_len = max;
                }
        }

        do {
                int actual_len = 0;
                uint32_t hcint;
                int odd_frame = 0;
                xfer_len = len - done;

                if (xfer_len > max_xfer_len)
                        xfer_len = max_xfer_len;
                else if (xfer_len > max)
                        num_packets = (xfer_len + max - 1) / max;
                else
                        num_packets = 1;

                if (complete_split)
                        setbits_le32(&hc_regs->hcsplt, DWC2_HCSPLT_COMPSPLT);
                else if (do_split)
                        clrbits_le32(&hc_regs->hcsplt, DWC2_HCSPLT_COMPSPLT);

                if (eptype == DWC2_HCCHAR_EPTYPE_INTR) {
                        int uframe_num = readl(&host_regs->hfnum);
                        if (!(uframe_num & 0x1))
                                odd_frame = 1;
                }

                ret = transfer_chunk(hc_regs, priv->aligned_buffer, pid,
                                     in, (char *)buffer + done, num_packets,
                                     xfer_len, &actual_len, odd_frame);

                hcint = readl(&hc_regs->hcint);
                if (complete_split) {
                        stop_transfer = 0;
                        if (hcint & DWC2_HCINT_NYET) {
                                ret = 0;
                                int frame_num = DWC2_HFNUM_MAX_FRNUM &
                                                readl(&host_regs->hfnum);
                                if (((frame_num - ssplit_frame_num) &
                                    DWC2_HFNUM_MAX_FRNUM) > 4)
                                        ret = -EAGAIN;
                        } else
                                complete_split = 0;
                } else if (do_split) {
                        if (hcint & DWC2_HCINT_ACK) {
                                ssplit_frame_num = DWC2_HFNUM_MAX_FRNUM &
                                                   readl(&host_regs->hfnum);
                                ret = 0;
                                complete_split = 1;
                        }
                }

                if (ret)
                        break;

                if (actual_len < xfer_len)
                        stop_transfer = 1;

                done += actual_len;

        /* Transactions are done when when either all data is transferred or
         * there is a short transfer. In case of a SPLIT make sure the CSPLIT
         * is executed.
         */
        } while (((done < len) && !stop_transfer) || complete_split);

        writel(0, &hc_regs->hcintmsk);
        writel(0xFFFFFFFF, &hc_regs->hcint);

        dev->status = 0;
        dev->act_len = done;

        return ret;
}

/* U-Boot USB transmission interface */
int _submit_bulk_msg(struct dwc2_priv *priv, struct usb_device *dev,
                     unsigned long pipe, void *buffer, int len)
{
        int devnum = usb_pipedevice(pipe);
        int ep = usb_pipeendpoint(pipe);
        u8* pid;

        if ((devnum >= MAX_DEVICE) || (devnum == priv->root_hub_devnum)) {
                dev->status = 0;
                return -EINVAL;
        }

        if (usb_pipein(pipe))
                pid = &priv->in_data_toggle[devnum][ep];
        else
                pid = &priv->out_data_toggle[devnum][ep];

        return chunk_msg(priv, dev, pipe, pid, usb_pipein(pipe), buffer, len);
}

static int _submit_control_msg(struct dwc2_priv *priv, struct usb_device *dev,
                               unsigned long pipe, void *buffer, int len,
                               struct devrequest *setup)
{
        int devnum = usb_pipedevice(pipe);
        int ret, act_len;
        u8 pid;
        /* For CONTROL endpoint pid should start with DATA1 */
        int status_direction;

        if (devnum == priv->root_hub_devnum) {
                dev->status = 0;
                dev->speed = USB_SPEED_HIGH;
                return dwc_otg_submit_rh_msg(priv, dev, pipe, buffer, len,
                                             setup);
        }

        /* SETUP stage */
        pid = DWC2_HC_PID_SETUP;
        do {
                ret = chunk_msg(priv, dev, pipe, &pid, 0, setup, 8);
        } while (ret == -EAGAIN);
        if (ret)
                return ret;

        /* DATA stage */
        act_len = 0;
        if (buffer) {
                pid = DWC2_HC_PID_DATA1;
                do {
                        ret = chunk_msg(priv, dev, pipe, &pid, usb_pipein(pipe),
                                        buffer, len);
                        act_len += dev->act_len;
                        buffer += dev->act_len;
                        len -= dev->act_len;
                } while (ret == -EAGAIN);
                if (ret)
                        return ret;
                status_direction = usb_pipeout(pipe);
        } else {
                /* No-data CONTROL always ends with an IN transaction */
                status_direction = 1;
        }

        /* STATUS stage */
        pid = DWC2_HC_PID_DATA1;
        do {
                ret = chunk_msg(priv, dev, pipe, &pid, status_direction,
                                priv->status_buffer, 0);
        } while (ret == -EAGAIN);
        if (ret)
                return ret;

        dev->act_len = act_len;

        return 0;
}

int _submit_int_msg(struct dwc2_priv *priv, struct usb_device *dev,
                    unsigned long pipe, void *buffer, int len, int interval)
{
        unsigned long timeout;
        int ret;

        /* FIXME: what is interval? */

        timeout = get_timer(0) + USB_TIMEOUT_MS(pipe);
        for (;;) {
                if (get_timer(0) > timeout) {
                        printf("Timeout poll on interrupt endpoint\n");
                        return -ETIMEDOUT;
                }
                ret = _submit_bulk_msg(priv, dev, pipe, buffer, len);
                if (ret != -EAGAIN)
                        return ret;
        }
}

static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv)
{
        struct dwc2_core_regs *regs = priv->regs;
        uint32_t snpsid;
        int i, j;

        snpsid = readl(&regs->gsnpsid);
        printf("Core Release: %x.%03x\n", snpsid >> 12 & 0xf, snpsid & 0xfff);

        if ((snpsid & DWC2_SNPSID_DEVID_MASK) != DWC2_SNPSID_DEVID_VER_2xx &&
            (snpsid & DWC2_SNPSID_DEVID_MASK) != DWC2_SNPSID_DEVID_VER_3xx) {
                printf("SNPSID invalid (not DWC2 OTG device): %08x\n", snpsid);
                return -ENODEV;
        }

#ifdef CONFIG_DWC2_PHY_ULPI_EXT_VBUS
        priv->ext_vbus = 1;
#else
        priv->ext_vbus = 0;
#endif

        dwc_otg_core_init(priv);
        dwc_otg_core_host_init(dev, regs);

        clrsetbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA |
                        DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |
                        DWC2_HPRT0_PRTOVRCURRCHNG,
                        DWC2_HPRT0_PRTRST);
        mdelay(50);
        clrbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA | DWC2_HPRT0_PRTCONNDET |
                     DWC2_HPRT0_PRTENCHNG | DWC2_HPRT0_PRTOVRCURRCHNG |
                     DWC2_HPRT0_PRTRST);

        for (i = 0; i < MAX_DEVICE; i++) {
                for (j = 0; j < MAX_ENDPOINT; j++) {
                        priv->in_data_toggle[i][j] = DWC2_HC_PID_DATA0;
                        priv->out_data_toggle[i][j] = DWC2_HC_PID_DATA0;
                }
        }

        /*
         * Add a 1 second delay here. This gives the host controller
         * a bit time before the comminucation with the USB devices
         * is started (the bus is scanned) and  fixes the USB detection
         * problems with some problematic USB keys.
         */
        if (readl(&regs->gintsts) & DWC2_GINTSTS_CURMODE_HOST)
                mdelay(1000);

        return 0;
}

static void dwc2_uninit_common(struct dwc2_core_regs *regs)
{
        /* Put everything in reset. */
        clrsetbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA |
                        DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |
                        DWC2_HPRT0_PRTOVRCURRCHNG,
                        DWC2_HPRT0_PRTRST);
}

#ifndef CONFIG_DM_USB
int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                       int len, struct devrequest *setup)
{
        return _submit_control_msg(&local, dev, pipe, buffer, len, setup);
}

int submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                    int len)
{
        return _submit_bulk_msg(&local, dev, pipe, buffer, len);
}

int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                   int len, int interval)
{
        return _submit_int_msg(&local, dev, pipe, buffer, len, interval);
}

/* U-Boot USB control interface */
int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
{
        struct dwc2_priv *priv = &local;

        memset(priv, '\0', sizeof(*priv));
        priv->root_hub_devnum = 0;
        priv->regs = (struct dwc2_core_regs *)CONFIG_USB_DWC2_REG_ADDR;
        priv->aligned_buffer = aligned_buffer_addr;
        priv->status_buffer = status_buffer_addr;

        /* board-dependant init */
        if (board_usb_init(index, USB_INIT_HOST))
                return -1;

        return dwc2_init_common(NULL, priv);
}

int usb_lowlevel_stop(int index)
{
        dwc2_uninit_common(local.regs);

        return 0;
}
#endif

#ifdef CONFIG_DM_USB
static int dwc2_submit_control_msg(struct udevice *dev, struct usb_device *udev,
                                   unsigned long pipe, void *buffer, int length,
                                   struct devrequest *setup)
{
        struct dwc2_priv *priv = dev_get_priv(dev);

        debug("%s: dev='%s', udev=%p, udev->dev='%s', portnr=%d\n", __func__,
              dev->name, udev, udev->dev->name, udev->portnr);

        return _submit_control_msg(priv, udev, pipe, buffer, length, setup);
}

static int dwc2_submit_bulk_msg(struct udevice *dev, struct usb_device *udev,
                                unsigned long pipe, void *buffer, int length)
{
        struct dwc2_priv *priv = dev_get_priv(dev);

        debug("%s: dev='%s', udev=%p\n", __func__, dev->name, udev);

        return _submit_bulk_msg(priv, udev, pipe, buffer, length);
}

static int dwc2_submit_int_msg(struct udevice *dev, struct usb_device *udev,
                               unsigned long pipe, void *buffer, int length,
                               int interval)
{
        struct dwc2_priv *priv = dev_get_priv(dev);

        debug("%s: dev='%s', udev=%p\n", __func__, dev->name, udev);

        return _submit_int_msg(priv, udev, pipe, buffer, length, interval);
}

static int dwc2_usb_ofdata_to_platdata(struct udevice *dev)
{
        struct dwc2_priv *priv = dev_get_priv(dev);
        fdt_addr_t addr;

        addr = dev_read_addr(dev);
        if (addr == FDT_ADDR_T_NONE)
                return -EINVAL;
        priv->regs = (struct dwc2_core_regs *)addr;

        priv->oc_disable = dev_read_bool(dev, "disable-over-current");
        priv->hnp_srp_disable = dev_read_bool(dev, "hnp-srp-disable");

        return 0;
}

static int dwc2_usb_probe(struct udevice *dev)
{
        struct dwc2_priv *priv = dev_get_priv(dev);
        struct usb_bus_priv *bus_priv = dev_get_uclass_priv(dev);

        bus_priv->desc_before_addr = true;

        return dwc2_init_common(dev, priv);
}

static int dwc2_usb_remove(struct udevice *dev)
{
        struct dwc2_priv *priv = dev_get_priv(dev);

        dwc2_uninit_common(priv->regs);

        return 0;
}

struct dm_usb_ops dwc2_usb_ops = {
        .control = dwc2_submit_control_msg,
        .bulk = dwc2_submit_bulk_msg,
        .interrupt = dwc2_submit_int_msg,
};

static const struct udevice_id dwc2_usb_ids[] = {
        { .compatible = "brcm,bcm2835-usb" },
        { .compatible = "snps,dwc2" },
        { }
};

U_BOOT_DRIVER(usb_dwc2) = {
        .name   = "dwc2_usb",
        .id     = UCLASS_USB,
        .of_match = dwc2_usb_ids,
        .ofdata_to_platdata = dwc2_usb_ofdata_to_platdata,
        .probe  = dwc2_usb_probe,
        .remove = dwc2_usb_remove,
        .ops    = &dwc2_usb_ops,
        .priv_auto_alloc_size = sizeof(struct dwc2_priv),
        .flags  = DM_FLAG_ALLOC_PRIV_DMA,
};
#endif