Linux 4.19-rc7

[linux-2.6/btrfs-unstable.git] / drivers / usb / gadget / udc / net2272.h

// SPDX-License-Identifier: GPL-2.0+
/*
 * PLX NET2272 high/full speed USB device controller
 *
 * Copyright (C) 2005-2006 PLX Technology, Inc.
 * Copyright (C) 2006-2011 Analog Devices, Inc.
 */

#ifndef __NET2272_H__
#define __NET2272_H__

/* Main Registers */
#define REGADDRPTR                      0x00
#define REGDATA                         0x01
#define IRQSTAT0                        0x02
#define         ENDPOINT_0_INTERRUPT                    0
#define         ENDPOINT_A_INTERRUPT                    1
#define         ENDPOINT_B_INTERRUPT                    2
#define         ENDPOINT_C_INTERRUPT                    3
#define         VIRTUALIZED_ENDPOINT_INTERRUPT          4
#define         SETUP_PACKET_INTERRUPT                  5
#define         DMA_DONE_INTERRUPT                      6
#define         SOF_INTERRUPT                           7
#define IRQSTAT1                        0x03
#define         CONTROL_STATUS_INTERRUPT                1
#define         VBUS_INTERRUPT                          2
#define         SUSPEND_REQUEST_INTERRUPT               3
#define         SUSPEND_REQUEST_CHANGE_INTERRUPT        4
#define         RESUME_INTERRUPT                        5
#define         ROOT_PORT_RESET_INTERRUPT               6
#define         RESET_STATUS                            7
#define PAGESEL                         0x04
#define DMAREQ                          0x1c
#define         DMA_ENDPOINT_SELECT                     0
#define         DREQ_POLARITY                           1
#define         DACK_POLARITY                           2
#define         EOT_POLARITY                            3
#define         DMA_CONTROL_DACK                        4
#define         DMA_REQUEST_ENABLE                      5
#define         DMA_REQUEST                             6
#define         DMA_BUFFER_VALID                        7
#define SCRATCH                         0x1d
#define IRQENB0                         0x20
#define         ENDPOINT_0_INTERRUPT_ENABLE             0
#define         ENDPOINT_A_INTERRUPT_ENABLE             1
#define         ENDPOINT_B_INTERRUPT_ENABLE             2
#define         ENDPOINT_C_INTERRUPT_ENABLE             3
#define         VIRTUALIZED_ENDPOINT_INTERRUPT_ENABLE   4
#define         SETUP_PACKET_INTERRUPT_ENABLE           5
#define         DMA_DONE_INTERRUPT_ENABLE               6
#define         SOF_INTERRUPT_ENABLE                    7
#define IRQENB1                         0x21
#define         VBUS_INTERRUPT_ENABLE                   2
#define         SUSPEND_REQUEST_INTERRUPT_ENABLE        3
#define         SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE 4
#define         RESUME_INTERRUPT_ENABLE                 5
#define         ROOT_PORT_RESET_INTERRUPT_ENABLE        6
#define LOCCTL                          0x22
#define         DATA_WIDTH                              0
#define         LOCAL_CLOCK_OUTPUT                      1
#define                 LOCAL_CLOCK_OUTPUT_OFF                  0
#define                 LOCAL_CLOCK_OUTPUT_3_75MHZ              1
#define                 LOCAL_CLOCK_OUTPUT_7_5MHZ               2
#define                 LOCAL_CLOCK_OUTPUT_15MHZ                3
#define                 LOCAL_CLOCK_OUTPUT_30MHZ                4
#define                 LOCAL_CLOCK_OUTPUT_60MHZ                5
#define         DMA_SPLIT_BUS_MODE                      4
#define         BYTE_SWAP                               5
#define         BUFFER_CONFIGURATION                    6
#define                 BUFFER_CONFIGURATION_EPA512_EPB512      0
#define                 BUFFER_CONFIGURATION_EPA1024_EPB512     1
#define                 BUFFER_CONFIGURATION_EPA1024_EPB1024    2
#define                 BUFFER_CONFIGURATION_EPA1024DB          3
#define CHIPREV_LEGACY                  0x23
#define                 NET2270_LEGACY_REV                      0x40
#define LOCCTL1                         0x24
#define         DMA_MODE                                0
#define                 SLOW_DREQ                               0
#define                 FAST_DREQ                               1
#define                 BURST_MODE                              2
#define         DMA_DACK_ENABLE                         2
#define CHIPREV_2272                    0x25
#define                 CHIPREV_NET2272_R1                      0x10
#define                 CHIPREV_NET2272_R1A                     0x11
/* USB Registers */
#define USBCTL0                         0x18
#define         IO_WAKEUP_ENABLE                        1
#define         USB_DETECT_ENABLE                       3
#define         USB_ROOT_PORT_WAKEUP_ENABLE             5
#define USBCTL1                         0x19
#define         VBUS_PIN                                0
#define                 USB_FULL_SPEED                          1
#define                 USB_HIGH_SPEED                          2
#define         GENERATE_RESUME                         3
#define         VIRTUAL_ENDPOINT_ENABLE                 4
#define FRAME0                          0x1a
#define FRAME1                          0x1b
#define OURADDR                         0x30
#define         FORCE_IMMEDIATE                         7
#define USBDIAG                         0x31
#define         FORCE_TRANSMIT_CRC_ERROR                0
#define         PREVENT_TRANSMIT_BIT_STUFF              1
#define         FORCE_RECEIVE_ERROR                     2
#define         FAST_TIMES                              4
#define USBTEST                         0x32
#define         TEST_MODE_SELECT                        0
#define                 NORMAL_OPERATION                        0
#define                 TEST_J                                  1
#define                 TEST_K                                  2
#define                 TEST_SE0_NAK                            3
#define                 TEST_PACKET                             4
#define                 TEST_FORCE_ENABLE                       5
#define XCVRDIAG                        0x33
#define         FORCE_FULL_SPEED                        2
#define         FORCE_HIGH_SPEED                        3
#define         OPMODE                                  4
#define                 NORMAL_OPERATION                        0
#define                 NON_DRIVING                             1
#define                 DISABLE_BITSTUFF_AND_NRZI_ENCODE        2
#define         LINESTATE                               6
#define                 SE0_STATE                               0
#define                 J_STATE                                 1
#define                 K_STATE                                 2
#define                 SE1_STATE                               3
#define VIRTOUT0                        0x34
#define VIRTOUT1                        0x35
#define VIRTIN0                         0x36
#define VIRTIN1                         0x37
#define SETUP0                          0x40
#define SETUP1                          0x41
#define SETUP2                          0x42
#define SETUP3                          0x43
#define SETUP4                          0x44
#define SETUP5                          0x45
#define SETUP6                          0x46
#define SETUP7                          0x47
/* Endpoint Registers (Paged via PAGESEL) */
#define EP_DATA                         0x05
#define EP_STAT0                        0x06
#define         DATA_IN_TOKEN_INTERRUPT                 0
#define         DATA_OUT_TOKEN_INTERRUPT                1
#define         DATA_PACKET_TRANSMITTED_INTERRUPT       2
#define         DATA_PACKET_RECEIVED_INTERRUPT          3
#define         SHORT_PACKET_TRANSFERRED_INTERRUPT      4
#define         NAK_OUT_PACKETS                         5
#define         BUFFER_EMPTY                            6
#define         BUFFER_FULL                             7
#define EP_STAT1                        0x07
#define         TIMEOUT                                 0
#define         USB_OUT_ACK_SENT                        1
#define         USB_OUT_NAK_SENT                        2
#define         USB_IN_ACK_RCVD                         3
#define         USB_IN_NAK_SENT                         4
#define         USB_STALL_SENT                          5
#define         LOCAL_OUT_ZLP                           6
#define         BUFFER_FLUSH                            7
#define EP_TRANSFER0                    0x08
#define EP_TRANSFER1                    0x09
#define EP_TRANSFER2                    0x0a
#define EP_IRQENB                       0x0b
#define         DATA_IN_TOKEN_INTERRUPT_ENABLE          0
#define         DATA_OUT_TOKEN_INTERRUPT_ENABLE         1
#define         DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE        2
#define         DATA_PACKET_RECEIVED_INTERRUPT_ENABLE   3
#define         SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE       4
#define EP_AVAIL0                       0x0c
#define EP_AVAIL1                       0x0d
#define EP_RSPCLR                       0x0e
#define EP_RSPSET                       0x0f
#define         ENDPOINT_HALT                           0
#define         ENDPOINT_TOGGLE                         1
#define         NAK_OUT_PACKETS_MODE                    2
#define         CONTROL_STATUS_PHASE_HANDSHAKE          3
#define         INTERRUPT_MODE                          4
#define         AUTOVALIDATE                            5
#define         HIDE_STATUS_PHASE                       6
#define         ALT_NAK_OUT_PACKETS                     7
#define EP_MAXPKT0                      0x28
#define EP_MAXPKT1                      0x29
#define         ADDITIONAL_TRANSACTION_OPPORTUNITIES    3
#define                 NONE_ADDITIONAL_TRANSACTION             0
#define                 ONE_ADDITIONAL_TRANSACTION              1
#define                 TWO_ADDITIONAL_TRANSACTION              2
#define EP_CFG                          0x2a
#define         ENDPOINT_NUMBER                         0
#define         ENDPOINT_DIRECTION                      4
#define         ENDPOINT_TYPE                           5
#define         ENDPOINT_ENABLE                         7
#define EP_HBW                          0x2b
#define         HIGH_BANDWIDTH_OUT_TRANSACTION_PID      0
#define                 DATA0_PID                               0
#define                 DATA1_PID                               1
#define                 DATA2_PID                               2
#define                 MDATA_PID                               3
#define EP_BUFF_STATES                  0x2c
#define         BUFFER_A_STATE                          0
#define         BUFFER_B_STATE                          2
#define                 BUFF_FREE                               0
#define                 BUFF_VALID                              1
#define                 BUFF_LCL                                2
#define                 BUFF_USB                                3

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

#define PCI_DEVICE_ID_RDK1      0x9054

/* PCI-RDK EPLD Registers */
#define RDK_EPLD_IO_REGISTER1           0x00000000
#define         RDK_EPLD_USB_RESET                              0
#define         RDK_EPLD_USB_POWERDOWN                          1
#define         RDK_EPLD_USB_WAKEUP                             2
#define         RDK_EPLD_USB_EOT                                3
#define         RDK_EPLD_DPPULL                                 4
#define RDK_EPLD_IO_REGISTER2           0x00000004
#define         RDK_EPLD_BUSWIDTH                               0
#define         RDK_EPLD_USER                                   2
#define         RDK_EPLD_RESET_INTERRUPT_ENABLE                 3
#define         RDK_EPLD_DMA_TIMEOUT_ENABLE                     4
#define RDK_EPLD_STATUS_REGISTER        0x00000008
#define         RDK_EPLD_USB_LRESET                             0
#define RDK_EPLD_REVISION_REGISTER      0x0000000c

/* PCI-RDK PLX 9054 Registers */
#define INTCSR                          0x68
#define         PCI_INTERRUPT_ENABLE                            8
#define         LOCAL_INTERRUPT_INPUT_ENABLE                    11
#define         LOCAL_INPUT_INTERRUPT_ACTIVE                    15
#define         LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE            18
#define         LOCAL_DMA_CHANNEL_1_INTERRUPT_ENABLE            19
#define         DMA_CHANNEL_0_INTERRUPT_ACTIVE                  21
#define         DMA_CHANNEL_1_INTERRUPT_ACTIVE                  22
#define CNTRL                           0x6C
#define         RELOAD_CONFIGURATION_REGISTERS                  29
#define         PCI_ADAPTER_SOFTWARE_RESET                      30
#define DMAMODE0                        0x80
#define         LOCAL_BUS_WIDTH                                 0
#define         INTERNAL_WAIT_STATES                            2
#define         TA_READY_INPUT_ENABLE                           6
#define         LOCAL_BURST_ENABLE                              8
#define         SCATTER_GATHER_MODE                             9
#define         DONE_INTERRUPT_ENABLE                           10
#define         LOCAL_ADDRESSING_MODE                           11
#define         DEMAND_MODE                                     12
#define         DMA_EOT_ENABLE                                  14
#define         FAST_SLOW_TERMINATE_MODE_SELECT                 15
#define         DMA_CHANNEL_INTERRUPT_SELECT                    17
#define DMAPADR0                        0x84
#define DMALADR0                        0x88
#define DMASIZ0                         0x8c
#define DMADPR0                         0x90
#define         DESCRIPTOR_LOCATION                             0
#define         END_OF_CHAIN                                    1
#define         INTERRUPT_AFTER_TERMINAL_COUNT                  2
#define         DIRECTION_OF_TRANSFER                           3
#define DMACSR0                         0xa8
#define         CHANNEL_ENABLE                                  0
#define         CHANNEL_START                                   1
#define         CHANNEL_ABORT                                   2
#define         CHANNEL_CLEAR_INTERRUPT                         3
#define         CHANNEL_DONE                                    4
#define DMATHR                          0xb0
#define LBRD1                           0xf8
#define         MEMORY_SPACE_LOCAL_BUS_WIDTH                    0
#define         W8_BIT                                          0
#define         W16_BIT                                         1

/* Special OR'ing of INTCSR bits */
#define LOCAL_INTERRUPT_TEST \
        ((1 << LOCAL_INPUT_INTERRUPT_ACTIVE) | \
         (1 << LOCAL_INTERRUPT_INPUT_ENABLE))

#define DMA_CHANNEL_0_TEST \
        ((1 << DMA_CHANNEL_0_INTERRUPT_ACTIVE) | \
         (1 << LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE))

#define DMA_CHANNEL_1_TEST \
        ((1 << DMA_CHANNEL_1_INTERRUPT_ACTIVE) | \
         (1 << LOCAL_DMA_CHANNEL_1_INTERRUPT_ENABLE))

/* EPLD Registers */
#define RDK_EPLD_IO_REGISTER1                   0x00000000
#define         RDK_EPLD_USB_RESET                      0
#define         RDK_EPLD_USB_POWERDOWN                  1
#define         RDK_EPLD_USB_WAKEUP                     2
#define         RDK_EPLD_USB_EOT                        3
#define         RDK_EPLD_DPPULL                         4
#define RDK_EPLD_IO_REGISTER2                   0x00000004
#define         RDK_EPLD_BUSWIDTH                       0
#define         RDK_EPLD_USER                           2
#define         RDK_EPLD_RESET_INTERRUPT_ENABLE         3
#define         RDK_EPLD_DMA_TIMEOUT_ENABLE             4
#define RDK_EPLD_STATUS_REGISTER                0x00000008
#define RDK_EPLD_USB_LRESET                             0
#define RDK_EPLD_REVISION_REGISTER              0x0000000c

#define EPLD_IO_CONTROL_REGISTER                0x400
#define         NET2272_RESET                           0
#define         BUSWIDTH                                1
#define         MPX_MODE                                3
#define         USER                                    4
#define         DMA_TIMEOUT_ENABLE                      5
#define         DMA_CTL_DACK                            6
#define         EPLD_DMA_ENABLE                         7
#define EPLD_DMA_CONTROL_REGISTER               0x800
#define         SPLIT_DMA_MODE                          0
#define         SPLIT_DMA_DIRECTION                     1
#define         SPLIT_DMA_ENABLE                        2
#define         SPLIT_DMA_INTERRUPT_ENABLE              3
#define         SPLIT_DMA_INTERRUPT                     4
#define         EPLD_DMA_MODE                           5
#define         EPLD_DMA_CONTROLLER_ENABLE              7
#define SPLIT_DMA_ADDRESS_LOW                   0xc00
#define SPLIT_DMA_ADDRESS_HIGH                  0x1000
#define SPLIT_DMA_BYTE_COUNT_LOW                0x1400
#define SPLIT_DMA_BYTE_COUNT_HIGH               0x1800
#define EPLD_REVISION_REGISTER                  0x1c00
#define SPLIT_DMA_RAM                           0x4000
#define DMA_RAM_SIZE                            0x1000

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

#define PCI_DEVICE_ID_RDK2      0x3272

/* PCI-RDK version 2 registers */

/* Main Control Registers */

#define RDK2_IRQENB                     0x00
#define RDK2_IRQSTAT                    0x04
#define         PB7                             23
#define         PB6                             22
#define         PB5                             21
#define         PB4                             20
#define         PB3                             19
#define         PB2                             18
#define         PB1                             17
#define         PB0                             16
#define         GP3                             23
#define         GP2                             23
#define         GP1                             23
#define         GP0                             23
#define         DMA_RETRY_ABORT                 6
#define         DMA_PAUSE_DONE                  5
#define         DMA_ABORT_DONE                  4
#define         DMA_OUT_FIFO_TRANSFER_DONE      3
#define         DMA_LOCAL_DONE                  2
#define         DMA_PCI_DONE                    1
#define         NET2272_PCI_IRQ                 0

#define RDK2_LOCCTLRDK                  0x08
#define         CHIP_RESET                      3
#define         SPLIT_DMA                       2
#define         MULTIPLEX_MODE                  1
#define         BUS_WIDTH                       0

#define RDK2_GPIOCTL                    0x10
#define         GP3_OUT_ENABLE                                  7
#define         GP2_OUT_ENABLE                                  6
#define         GP1_OUT_ENABLE                                  5
#define         GP0_OUT_ENABLE                                  4
#define         GP3_DATA                                        3
#define         GP2_DATA                                        2
#define         GP1_DATA                                        1
#define         GP0_DATA                                        0

#define RDK2_LEDSW                      0x14
#define         LED3                            27
#define         LED2                            26
#define         LED1                            25
#define         LED0                            24
#define         PBUTTON                         16
#define         DIPSW                           0

#define RDK2_DIAG                       0x18
#define         RDK2_FAST_TIMES                         2
#define         FORCE_PCI_SERR                          1
#define         FORCE_PCI_INT                           0
#define RDK2_FPGAREV                    0x1C

/* Dma Control registers */
#define RDK2_DMACTL                     0x80
#define         ADDR_HOLD                               24
#define         RETRY_COUNT                             16      /* 23:16 */
#define         FIFO_THRESHOLD                          11      /* 15:11 */
#define         MEM_WRITE_INVALIDATE                    10
#define         READ_MULTIPLE                           9
#define         READ_LINE                               8
#define         RDK2_DMA_MODE                           6       /* 7:6 */
#define         CONTROL_DACK                            5
#define         EOT_ENABLE                              4
#define         EOT_POLARITY                            3
#define         DACK_POLARITY                           2
#define         DREQ_POLARITY                           1
#define         DMA_ENABLE                              0

#define RDK2_DMASTAT                    0x84
#define         GATHER_COUNT                            12      /* 14:12 */
#define         FIFO_COUNT                              6       /* 11:6 */
#define         FIFO_FLUSH                              5
#define         FIFO_TRANSFER                           4
#define         PAUSE_DONE                              3
#define         ABORT_DONE                              2
#define         DMA_ABORT                               1
#define         DMA_START                               0

#define RDK2_DMAPCICOUNT                0x88
#define         DMA_DIRECTION                           31
#define         DMA_PCI_BYTE_COUNT                      0       /* 0:23 */

#define RDK2_DMALOCCOUNT                0x8C    /* 0:23 dma local byte count */

#define RDK2_DMAADDR                    0x90    /* 2:31 PCI bus starting address */

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

#define REG_INDEXED_THRESHOLD   (1 << 5)

/* DRIVER DATA STRUCTURES and UTILITIES */
struct net2272_ep {
        struct usb_ep ep;
        struct net2272 *dev;
        unsigned long irqs;

        /* analogous to a host-side qh */
        struct list_head queue;
        const struct usb_endpoint_descriptor *desc;
        unsigned num:8,
                 fifo_size:12,
                 stopped:1,
                 wedged:1,
                 is_in:1,
                 is_iso:1,
                 dma:1,
                 not_empty:1;
};

struct net2272 {
        /* each device provides one gadget, several endpoints */
        struct usb_gadget gadget;
        struct device *dev;
        unsigned short dev_id;

        spinlock_t lock;
        struct net2272_ep ep[4];
        struct usb_gadget_driver *driver;
        unsigned protocol_stall:1,
                 softconnect:1,
                 wakeup:1,
                 dma_eot_polarity:1,
                 dma_dack_polarity:1,
                 dma_dreq_polarity:1,
                 dma_busy:1;
        u16 chiprev;
        u8 pagesel;

        unsigned int irq;
        unsigned short fifo_mode;

        unsigned int base_shift;
        u16 __iomem *base_addr;
        union {
#ifdef CONFIG_USB_PCI
                struct {
                        void __iomem *plx9054_base_addr;
                        void __iomem *epld_base_addr;
                } rdk1;
                struct {
                        /* Bar0, Bar1 is base_addr both mem-mapped */
                        void __iomem *fpga_base_addr;
                } rdk2;
#endif
        };
};

static void __iomem *
net2272_reg_addr(struct net2272 *dev, unsigned int reg)
{
        return dev->base_addr + (reg << dev->base_shift);
}

static void
net2272_write(struct net2272 *dev, unsigned int reg, u8 value)
{
        if (reg >= REG_INDEXED_THRESHOLD) {
                /*
                 * Indexed register; use REGADDRPTR/REGDATA
                 *  - Save and restore REGADDRPTR. This prevents REGADDRPTR from
                 *    changes between other code sections, but it is time consuming.
                 *  - Performance tips: either do not save and restore REGADDRPTR (if it
                 *    is safe) or do save/restore operations only in critical sections.
                u8 tmp = readb(dev->base_addr + REGADDRPTR);
                 */
                writeb((u8)reg, net2272_reg_addr(dev, REGADDRPTR));
                writeb(value, net2272_reg_addr(dev, REGDATA));
                /* writeb(tmp, net2272_reg_addr(dev, REGADDRPTR)); */
        } else
                writeb(value, net2272_reg_addr(dev, reg));
}

static u8
net2272_read(struct net2272 *dev, unsigned int reg)
{
        u8 ret;

        if (reg >= REG_INDEXED_THRESHOLD) {
                /*
                 * Indexed register; use REGADDRPTR/REGDATA
                 *  - Save and restore REGADDRPTR. This prevents REGADDRPTR from
                 *    changes between other code sections, but it is time consuming.
                 *  - Performance tips: either do not save and restore REGADDRPTR (if it
                 *    is safe) or do save/restore operations only in critical sections.
                u8 tmp = readb(dev->base_addr + REGADDRPTR);
                 */
                writeb((u8)reg, net2272_reg_addr(dev, REGADDRPTR));
                ret = readb(net2272_reg_addr(dev, REGDATA));
                /* writeb(tmp, net2272_reg_addr(dev, REGADDRPTR)); */
        } else
                ret = readb(net2272_reg_addr(dev, reg));

        return ret;
}

static void
net2272_ep_write(struct net2272_ep *ep, unsigned int reg, u8 value)
{
        struct net2272 *dev = ep->dev;

        if (dev->pagesel != ep->num) {
                net2272_write(dev, PAGESEL, ep->num);
                dev->pagesel = ep->num;
        }
        net2272_write(dev, reg, value);
}

static u8
net2272_ep_read(struct net2272_ep *ep, unsigned int reg)
{
        struct net2272 *dev = ep->dev;

        if (dev->pagesel != ep->num) {
                net2272_write(dev, PAGESEL, ep->num);
                dev->pagesel = ep->num;
        }
        return net2272_read(dev, reg);
}

static void allow_status(struct net2272_ep *ep)
{
        /* ep0 only */
        net2272_ep_write(ep, EP_RSPCLR,
                (1 << CONTROL_STATUS_PHASE_HANDSHAKE) |
                (1 << ALT_NAK_OUT_PACKETS) |
                (1 << NAK_OUT_PACKETS_MODE));
        ep->stopped = 1;
}

static void set_halt(struct net2272_ep *ep)
{
        /* ep0 and bulk/intr endpoints */
        net2272_ep_write(ep, EP_RSPCLR, 1 << CONTROL_STATUS_PHASE_HANDSHAKE);
        net2272_ep_write(ep, EP_RSPSET, 1 << ENDPOINT_HALT);
}

static void clear_halt(struct net2272_ep *ep)
{
        /* ep0 and bulk/intr endpoints */
        net2272_ep_write(ep, EP_RSPCLR,
                (1 << ENDPOINT_HALT) | (1 << ENDPOINT_TOGGLE));
}

/* count (<= 4) bytes in the next fifo write will be valid */
static void set_fifo_bytecount(struct net2272_ep *ep, unsigned count)
{
        /* net2272_ep_write will truncate to u8 for us */
        net2272_ep_write(ep, EP_TRANSFER2, count >> 16);
        net2272_ep_write(ep, EP_TRANSFER1, count >> 8);
        net2272_ep_write(ep, EP_TRANSFER0, count);
}

struct net2272_request {
        struct usb_request req;
        struct list_head queue;
        unsigned mapped:1,
                 valid:1;
};

#endif