Ping Thanks, Sundeep.B.S. On Tue, Jun 10, 2014 at 5:34 PM, <subbaraya.sundeep.bhatta@xxxxxxxxxx> wrote: > From: Subbaraya Sundeep Bhatta <sbhatta@xxxxxxxxxx> > > This patch adds xilinx axi usb2 device driver support > > Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@xxxxxxxxxx> > --- > Changes for v3: > - Added pullup function > - Modified error handling > - Fixed all v2 comments except DMA interrupt handling > since polling seems to be faster. > Please refer to below message thread: > http://www.kernelhub.org/?p=2&msg=481724 > > Changes for v2: > - Added Resume > - Added Remote wakeup > - Fixed v1 comments > > drivers/usb/gadget/Kconfig | 14 + > drivers/usb/gadget/Makefile | 1 + > drivers/usb/gadget/udc-xilinx.c | 2273 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 2288 insertions(+), 0 deletions(-) > create mode 100644 drivers/usb/gadget/udc-xilinx.c > > diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig > index ba18e9c..83560dc 100644 > --- a/drivers/usb/gadget/Kconfig > +++ b/drivers/usb/gadget/Kconfig > @@ -459,6 +459,20 @@ config USB_EG20T > ML7213/ML7831 is companion chip for Intel Atom E6xx series. > ML7213/ML7831 is completely compatible for Intel EG20T PCH. > > +config USB_GADGET_XILINX > + tristate "Xilinx USB Driver" > + depends on COMPILE_TEST > + help > + USB peripheral controller driver for Xilinx AXI USB2 device. > + Xilinx AXI USB2 device is a soft IP which supports both full > + and high speed USB 2.0 data transfers. It has seven configurable > + endpoints(bulk or interrupt or isochronous), as well as > + endpoint zero(for control transfers). > + > + Say "y" to link the driver statically, or "m" to build a > + dynamically linked module called "xilinx_udc" and force all > + gadget drivers to also be dynamically linked. > + > # > # LAST -- dummy/emulated controller > # > diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile > index 49514ea..dc6dd41 100644 > --- a/drivers/usb/gadget/Makefile > +++ b/drivers/usb/gadget/Makefile > @@ -35,6 +35,7 @@ obj-$(CONFIG_USB_FUSB300) += fusb300_udc.o > obj-$(CONFIG_USB_FOTG210_UDC) += fotg210-udc.o > obj-$(CONFIG_USB_MV_U3D) += mv_u3d_core.o > obj-$(CONFIG_USB_GR_UDC) += gr_udc.o > +obj-$(CONFIG_USB_GADGET_XILINX) += udc-xilinx.o > > # USB Functions > usb_f_acm-y := f_acm.o > diff --git a/drivers/usb/gadget/udc-xilinx.c b/drivers/usb/gadget/udc-xilinx.c > new file mode 100644 > index 0000000..f377e8a > --- /dev/null > +++ b/drivers/usb/gadget/udc-xilinx.c > @@ -0,0 +1,2273 @@ > +/* > + * Xilinx USB peripheral controller driver > + * > + * Copyright (C) 2004 by Thomas Rathbone > + * Copyright (C) 2005 by HP Labs > + * Copyright (C) 2005 by David Brownell > + * Copyright (C) 2010 - 2014 Xilinx, Inc. > + * > + * Some parts of this driver code is based on the driver for at91-series > + * USB peripheral controller (at91_udc.c). > + * > + * 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; > + * either version 2 of the License, or (at your option) any > + * later version. > + */ > + > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/dma-mapping.h> > +#include "gadget_chips.h" > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of_address.h> > +#include <linux/of_device.h> > +#include <linux/of_platform.h> > +#include <linux/of_irq.h> > +#include <linux/prefetch.h> > +#include <linux/usb/ch9.h> > +#include <linux/usb/gadget.h> > + > +/* Register offsets for the USB device.*/ > +#define XUSB_EP0_CONFIG_OFFSET 0x0000 /* EP0 Config Reg Offset */ > +#define XUSB_SETUP_PKT_ADDR_OFFSET 0x0080 /* Setup Packet Address */ > +#define XUSB_ADDRESS_OFFSET 0x0100 /* Address Register */ > +#define XUSB_CONTROL_OFFSET 0x0104 /* Control Register */ > +#define XUSB_STATUS_OFFSET 0x0108 /* Status Register */ > +#define XUSB_FRAMENUM_OFFSET 0x010C /* Frame Number Register */ > +#define XUSB_IER_OFFSET 0x0110 /* Interrupt Enable Register */ > +#define XUSB_BUFFREADY_OFFSET 0x0114 /* Buffer Ready Register */ > +#define XUSB_TESTMODE_OFFSET 0x0118 /* Test Mode Register */ > +#define XUSB_DMA_RESET_OFFSET 0x0200 /* DMA Soft Reset Register */ > +#define XUSB_DMA_CONTROL_OFFSET 0x0204 /* DMA Control Register */ > +#define XUSB_DMA_DSAR_ADDR_OFFSET 0x0208 /* DMA source Address Reg */ > +#define XUSB_DMA_DDAR_ADDR_OFFSET 0x020C /* DMA destination Addr Reg */ > +#define XUSB_DMA_LENGTH_OFFSET 0x0210 /* DMA Length Register */ > +#define XUSB_DMA_STATUS_OFFSET 0x0214 /* DMA Status Register */ > + > +/* Endpoint Configuration Space offsets */ > +#define XUSB_EP_CFGSTATUS_OFFSET 0x00 /* Endpoint Config Status */ > +#define XUSB_EP_BUF0COUNT_OFFSET 0x08 /* Buffer 0 Count */ > +#define XUSB_EP_BUF1COUNT_OFFSET 0x0C /* Buffer 1 Count */ > + > +#define XUSB_CONTROL_USB_READY_MASK 0x80000000 /* USB ready Mask */ > +#define XUSB_CONTROL_USB_RMTWAKE_MASK 0x40000000 /* Remote wake up mask */ > + > +/* Interrupt register related masks.*/ > +#define XUSB_STATUS_GLOBAL_INTR_MASK 0x80000000 /* Global Intr Enable */ > +#define XUSB_STATUS_DMADONE_MASK 0x04000000 /* DMA done Mask */ > +#define XUSB_STATUS_DMAERR_MASK 0x02000000 /* DMA Error Mask */ > +#define XUSB_STATUS_DMABUSY_MASK 0x80000000 /* DMA Error Mask */ > +#define XUSB_STATUS_RESUME_MASK 0x01000000 /* USB Resume Mask */ > +#define XUSB_STATUS_RESET_MASK 0x00800000 /* USB Reset Mask */ > +#define XUSB_STATUS_SUSPEND_MASK 0x00400000 /* USB Suspend Mask */ > +#define XUSB_STATUS_DISCONNECT_MASK 0x00200000 /* USB Disconnect Mask */ > +#define XUSB_STATUS_FIFO_BUFF_RDY_MASK 0x00100000 /* FIFO Buff Ready Mask */ > +#define XUSB_STATUS_FIFO_BUFF_FREE_MASK 0x00080000 /* FIFO Buff Free Mask */ > +#define XUSB_STATUS_SETUP_PACKET_MASK 0x00040000 /* Setup packet received */ > +#define XUSB_STATUS_EP1_BUFF2_COMP_MASK 0x00000200 /* EP 1 Buff 2 Processed */ > +#define XUSB_STATUS_EP1_BUFF1_COMP_MASK 0x00000002 /* EP 1 Buff 1 Processed */ > +#define XUSB_STATUS_EP0_BUFF2_COMP_MASK 0x00000100 /* EP 0 Buff 2 Processed */ > +#define XUSB_STATUS_EP0_BUFF1_COMP_MASK 0x00000001 /* EP 0 Buff 1 Processed */ > +#define XUSB_STATUS_HIGH_SPEED_MASK 0x00010000 /* USB Speed Mask */ > +/* Suspend,Reset,Suspend and Disconnect Mask */ > +#define XUSB_STATUS_INTR_EVENT_MASK 0x01E00000 > +/* Buffers completion Mask */ > +#define XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK 0x0000FEFF > +/* Mask for buffer 0 and buffer 1 completion for all Endpoints */ > +#define XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK 0x00000101 > +#define XUSB_STATUS_EP_BUFF2_SHIFT 8 /* EP buffer offset */ > + > +/* Endpoint Configuration Status Register */ > +#define XUSB_EP_CFG_VALID_MASK 0x80000000 /* Endpoint Valid bit */ > +#define XUSB_EP_CFG_STALL_MASK 0x40000000 /* Endpoint Stall bit */ > +#define XUSB_EP_CFG_DATA_TOGGLE_MASK 0x08000000 /* Endpoint Data toggle */ > + > +/* USB device specific global configuration constants.*/ > +#define XUSB_MAX_ENDPOINTS 8 /* Maximum End Points */ > +#define XUSB_EP_NUMBER_ZERO 0 /* End point Zero */ > +/* DPRAM is the source address for DMA transfer */ > +#define XUSB_DMA_READ_FROM_DPRAM 0x80000000 > +#define XUSB_DMA_DMASR_BUSY 0x80000000 /* DMA busy */ > +#define XUSB_DMA_DMASR_ERROR 0x40000000 /* DMA Error */ > +/* > + * When this bit is set, the DMA buffer ready bit is set by hardware upon > + * DMA transfer completion. > + */ > +#define XUSB_DMA_BRR_CTRL 0x40000000 /* DMA bufready ctrl bit */ > +/* Phase States */ > +#define SETUP_PHASE 0x0000 /* Setup Phase */ > +#define DATA_PHASE 0x0001 /* Data Phase */ > +#define STATUS_PHASE 0x0002 /* Status Phase */ > + > +#define EP0_MAX_PACKET 64 /* Endpoint 0 maximum packet length */ > + > +/* container_of helper macros */ > +#define to_udc(g) container_of((g), struct xusb_udc, gadget) > +#define to_xusb_ep(ep) container_of((ep), struct xusb_ep, ep_usb) > +#define to_xusb_req(req) container_of((req), struct xusb_req, usb_req) > + > +/** > + * struct xusb_req - Xilinx USB device request structure > + * @usb_req: Linux usb request structure > + * @queue: usb device request queue > + * @ep: pointer to xusb_endpoint structure > + */ > +struct xusb_req { > + struct usb_request usb_req; > + struct list_head queue; > + struct xusb_ep *ep; > +}; > + > +/** > + * struct xusb_ep - USB end point structure. > + * @ep_usb: usb endpoint instance > + * @queue: endpoint message queue > + * @udc: xilinx usb peripheral driver instance pointer > + * @desc: pointer to the usb endpoint descriptor > + * @rambase: the endpoint buffer address > + * @offset: the endpoint register offset value > + * @name: name of the endpoint > + * @epnumber: endpoint number > + * @maxpacket: maximum packet size the endpoint can store > + * @buffer0count: the size of the packet recieved in the first buffer > + * @buffer1count: the size of the packet received in the second buffer > + * @buffer0ready: the busy state of first buffer > + * @buffer1ready: the busy state of second buffer > + * @eptype: endpoint transfer type (BULK, INTERRUPT) > + * @curbufnum: current buffer of endpoint that will be processed next > + * @is_in: endpoint direction (IN or OUT) > + * @is_iso: endpoint type(isochronous or non isochronous) > + */ > +struct xusb_ep { > + struct usb_ep ep_usb; > + struct list_head queue; > + struct xusb_udc *udc; > + const struct usb_endpoint_descriptor *desc; > + u32 rambase; > + u32 offset; > + char name[4]; > + u16 epnumber; > + u16 maxpacket; > + u16 buffer0count; > + u16 buffer1count; > + u8 buffer0ready; > + u8 buffer1ready; > + u8 eptype; > + u8 curbufnum; > + u8 is_in; > + u8 is_iso; > +}; > + > +/** > + * struct xusb_udc - USB peripheral driver structure > + * @gadget: USB gadget driver instance > + * @ep: an array of endpoint structures > + * @driver: pointer to the usb gadget driver instance > + * @setup: usb_ctrlrequest structure for control requests > + * @req: pointer to dummy request for get status command > + * @dev: pointer to device structure in gadget > + * @usb_state: device in suspended state or not > + * @remote_wkp: remote wakeup enabled by host > + * @setupseqtx: tx status > + * @setupseqrx: rx status > + * @read_fn: function pointer to read device registers > + * @write_fn: function pointer to write to device registers > + * @base_address: the usb device base address > + * @lock: instance of spinlock > + * @dma_enabled: flag indicating whether the dma is included in the system > + */ > +struct xusb_udc { > + struct usb_gadget gadget; > + struct xusb_ep ep[8]; > + struct usb_gadget_driver *driver; > + struct usb_ctrlrequest setup; > + struct xusb_req *req; > + struct device *dev; > + u32 usb_state; > + u32 remote_wkp; > + u32 setupseqtx; > + u32 setupseqrx; > + unsigned int (*read_fn)(void __iomem *); > + void (*write_fn)(void __iomem *, u32, u32); > + void __iomem *base_address; > + spinlock_t lock; > + bool dma_enabled; > +}; > + > +/* Endpoint buffer start addresses in the core */ > +static u32 rambase[8] = { 0x22, 0x1000, 0x1100, 0x1200, 0x1300, 0x1400, 0x1500, > + 0x1600 }; > + > +static const char driver_name[] = "xilinx-udc"; > +static const char ep0name[] = "ep0"; > + > +/* Control endpoint configuration.*/ > +static const struct usb_endpoint_descriptor config_bulk_out_desc = { > + .bLength = USB_DT_ENDPOINT_SIZE, > + .bDescriptorType = USB_DT_ENDPOINT, > + .bEndpointAddress = USB_DIR_OUT, > + .bmAttributes = USB_ENDPOINT_XFER_BULK, > + .wMaxPacketSize = __constant_cpu_to_le16(64), > +}; > + > +/** > + * xudc_write32 - little endian write to device registers > + * @addr: base addr of device registers > + * @offset: register offset > + * @val: data to be written > + */ > +static void xudc_write32(void __iomem *addr, u32 offset, u32 val) > +{ > + iowrite32(val, addr + offset); > +} > + > +/** > + * xudc_read32 - little endian read from device registers > + * @addr: addr of device register > + * Return: value at addr > + */ > +static unsigned int xudc_read32(void __iomem *addr) > +{ > + return ioread32(addr); > +} > + > +/** > + * xudc_write32_be - big endian write to device registers > + * @addr: base addr of device registers > + * @offset: register offset > + * @val: data to be written > + */ > +static void xudc_write32_be(void __iomem *addr, u32 offset, u32 val) > +{ > + iowrite32be(val, addr + offset); > +} > + > +/** > + * xudc_read32_be - big endian read from device registers > + * @addr: addr of device register > + * Return: value at addr > + */ > +static unsigned int xudc_read32_be(void __iomem *addr) > +{ > + return ioread32be(addr); > +} > + > +/** > + * xudc_wrstatus - Sets up the usb device status stages. > + * @udc: pointer to the usb device controller structure. > + */ > +static void xudc_wrstatus(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO]; > + u32 epcfgreg; > + > + epcfgreg = udc->read_fn(udc->base_address + ep0->offset)| > + XUSB_EP_CFG_DATA_TOGGLE_MASK; > + udc->write_fn(udc->base_address, ep0->offset, epcfgreg); > + udc->write_fn(udc->base_address, ep0->offset + XUSB_EP_BUF0COUNT_OFFSET, > + 0); > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, 1); > +} > + > +/** > + * xudc_epconfig - Configures the given endpoint. > + * @ep: pointer to the usb device endpoint structure. > + * @udc: pointer to the usb peripheral controller structure. > + * > + * This function configures a specific endpoint with the given configuration > + * data. > + */ > +static void xudc_epconfig(struct xusb_ep *ep, struct xusb_udc *udc) > +{ > + u32 epcfgreg; > + > + /* > + * Configure the end point direction, type, Max Packet Size and the > + * EP buffer location. > + */ > + epcfgreg = ((ep->is_in << 29) | (ep->eptype << 28) | > + (ep->ep_usb.maxpacket << 15) | (ep->rambase)); > + udc->write_fn(udc->base_address, ep->offset, epcfgreg); > + > + /* Set the Buffer count and the Buffer ready bits.*/ > + udc->write_fn(udc->base_address, ep->offset + XUSB_EP_BUF0COUNT_OFFSET, > + ep->buffer0count); > + udc->write_fn(udc->base_address, ep->offset + XUSB_EP_BUF1COUNT_OFFSET, > + ep->buffer1count); > + if (ep->buffer0ready) > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, > + 1 << ep->epnumber); > + if (ep->buffer1ready) > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, 1 << > + (ep->epnumber + XUSB_STATUS_EP_BUFF2_SHIFT)); > +} > + > +/** > + * xudc_start_dma - Starts DMA transfer. > + * @ep: pointer to the usb device endpoint structure. > + * @src: DMA source address. > + * @dst: DMA destination address. > + * @length: number of bytes to transfer. > + * > + * Return: 0 on success, error code on failure > + * > + * This function starts DMA transfer by writing to DMA source, > + * destination and lenth registers. > + */ > +static int xudc_start_dma(struct xusb_ep *ep, dma_addr_t src, > + dma_addr_t dst, u32 length) > +{ > + struct xusb_udc *udc = ep->udc; > + int rc = 0; > + u32 timeout = 500; > + u32 reg; > + > + /* > + * Set the addresses in the DMA source and > + * destination registers and then set the length > + * into the DMA length register. > + */ > + udc->write_fn(udc->base_address, XUSB_DMA_DSAR_ADDR_OFFSET, src); > + udc->write_fn(udc->base_address, XUSB_DMA_DDAR_ADDR_OFFSET, dst); > + udc->write_fn(udc->base_address, XUSB_DMA_LENGTH_OFFSET, length); > + > + /* > + * Wait till DMA transaction is complete and > + * check whether the DMA transaction was > + * successful. > + */ > + do { > + reg = udc->read_fn(udc->base_address + XUSB_DMA_STATUS_OFFSET); > + if (!(reg & XUSB_DMA_DMASR_BUSY)) > + break; > + > + /* > + * We can't sleep here, because it's also called from > + * interrupt context. > + */ > + timeout--; > + if (!timeout) { > + dev_err(udc->dev, "DMA timeout\n"); > + return -ETIMEDOUT; > + } > + udelay(1); > + } while (1); > + > + if ((udc->read_fn(udc->base_address + XUSB_DMA_STATUS_OFFSET) & > + XUSB_DMA_DMASR_ERROR) == XUSB_DMA_DMASR_ERROR){ > + dev_err(udc->dev, "DMA Error\n"); > + rc = -EINVAL; > + } > + > + return rc; > +} > + > +/** > + * xudc_dma_send - Sends IN data using DMA. > + * @ep: pointer to the usb device endpoint structure. > + * @req: pointer to the usb request structure. > + * @buffer: pointer to data to be sent. > + * @length: number of bytes to send. > + * > + * Return: 0 on success, -EAGAIN if no buffer is free and error > + * code on failure. > + * > + * This function sends data using DMA. > + */ > +static int xudc_dma_send(struct xusb_ep *ep, struct xusb_req *req, > + u8 *buffer, u32 length) > +{ > + u32 *eprambase; > + dma_addr_t src; > + dma_addr_t dst; > + int ret; > + struct xusb_udc *udc = ep->udc; > + > + src = req->usb_req.dma + req->usb_req.actual; > + if (req->usb_req.length) > + dma_sync_single_for_device(udc->dev, src, > + length, DMA_TO_DEVICE); > + if (!ep->curbufnum && !ep->buffer0ready) { > + /* Get the Buffer address and copy the transmit data.*/ > + eprambase = (u32 __force *)(ep->udc->base_address + > + ep->rambase); > + dst = virt_to_phys(eprambase); > + udc->write_fn(udc->base_address, ep->offset + > + XUSB_EP_BUF0COUNT_OFFSET, length); > + udc->write_fn(udc->base_address, XUSB_DMA_CONTROL_OFFSET, > + XUSB_DMA_BRR_CTRL | (1 << ep->epnumber)); > + ep->buffer0ready = 1; > + ep->curbufnum = 1; > + } else if (ep->curbufnum && !ep->buffer1ready) { > + /* Get the Buffer address and copy the transmit data.*/ > + eprambase = (u32 __force *)(ep->udc->base_address + > + ep->rambase + ep->ep_usb.maxpacket); > + dst = virt_to_phys(eprambase); > + udc->write_fn(ep->udc->base_address, ep->offset + > + XUSB_EP_BUF1COUNT_OFFSET, length); > + udc->write_fn(udc->base_address, XUSB_DMA_CONTROL_OFFSET, > + XUSB_DMA_BRR_CTRL | (1 << (ep->epnumber + > + XUSB_STATUS_EP_BUFF2_SHIFT))); > + ep->buffer1ready = 1; > + ep->curbufnum = 0; > + } else { > + /* None of ping pong buffers are ready currently .*/ > + return -EAGAIN; > + } > + > + ret = xudc_start_dma(ep, src, dst, length); > + return ret; > +} > + > +/** > + * xudc_dma_receive - Receives OUT data using DMA. > + * @ep: pointer to the usb device endpoint structure. > + * @req: pointer to the usb request structure. > + * @buffer: pointer to storage buffer of received data. > + * @length: number of bytes to receive. > + * > + * Return: 0 on success, -EAGAIN if no buffer is free and error > + * code on failure. > + * > + * This function receives data using DMA. > + */ > +static int xudc_dma_receive(struct xusb_ep *ep, struct xusb_req *req, > + u8 *buffer, u32 length) > +{ > + u32 *eprambase; > + dma_addr_t src; > + dma_addr_t dst; > + int ret = 0; > + struct xusb_udc *udc = ep->udc; > + > + dst = req->usb_req.dma + req->usb_req.actual; > + > + if (!ep->curbufnum && !ep->buffer0ready) { > + /* Get the Buffer address and copy the transmit data */ > + eprambase = (u32 __force *)(ep->udc->base_address + > + ep->rambase); > + src = virt_to_phys(eprambase); > + udc->write_fn(udc->base_address, XUSB_DMA_CONTROL_OFFSET, > + XUSB_DMA_BRR_CTRL | XUSB_DMA_READ_FROM_DPRAM | > + (1 << ep->epnumber)); > + ep->buffer0ready = 1; > + ep->curbufnum = 1; > + } else if (ep->curbufnum && !ep->buffer1ready) { > + /* Get the Buffer address and copy the transmit data */ > + eprambase = (u32 __force *)(ep->udc->base_address + > + ep->rambase + ep->ep_usb.maxpacket); > + src = virt_to_phys(eprambase); > + udc->write_fn(udc->base_address, XUSB_DMA_CONTROL_OFFSET, > + XUSB_DMA_BRR_CTRL | XUSB_DMA_READ_FROM_DPRAM | > + (1 << (ep->epnumber + > + XUSB_STATUS_EP_BUFF2_SHIFT))); > + ep->buffer1ready = 1; > + ep->curbufnum = 0; > + } else { > + /* None of the ping-pong buffers are ready currently */ > + return -EAGAIN; > + } > + > + xudc_start_dma(ep, src, dst, length); > + return ret; > +} > + > +/** > + * xudc_eptxrx - Transmits or receives data to or from an endpoint. > + * @ep: pointer to the usb endpoint configuration structure. > + * @req: pointer to the usb request structure. > + * @bufferptr: pointer to buffer containing the data to be sent. > + * @bufferlen: The number of data bytes to be sent. > + * > + * Return: 0 on success, -EAGAIN if no buffer is free. > + * > + * This function copies the transmit/receive data to/from the end point buffer > + * and enables the buffer for transmission/reception. > + */ > +static int xudc_eptxrx(struct xusb_ep *ep, struct xusb_req *req, > + u8 *bufferptr, u32 bufferlen) > +{ > + u32 *eprambase; > + u32 bytestosend; > + u8 *temprambase; > + int rc = 0; > + struct xusb_udc *udc = ep->udc; > + > + bytestosend = bufferlen; > + if (udc->dma_enabled) { > + if (ep->is_in) > + rc = xudc_dma_send(ep, req, bufferptr, bufferlen); > + else > + rc = xudc_dma_receive(ep, req, bufferptr, bufferlen); > + return rc; > + } > + /* Put the transmit buffer into the correct ping-pong buffer.*/ > + if (!ep->curbufnum && !ep->buffer0ready) { > + /* Get the Buffer address and copy the transmit data.*/ > + eprambase = (u32 __force *)(udc->base_address + ep->rambase); > + while (bytestosend > 3) { > + if (ep->is_in) > + *eprambase++ = *(u32 *)bufferptr; > + else > + *(u32 *)bufferptr = *eprambase++; > + bufferptr += 4; > + bytestosend -= 4; > + } > + temprambase = (u8 *)eprambase; > + while (bytestosend--) { > + if (ep->is_in) > + *temprambase++ = *bufferptr++; > + else > + *bufferptr++ = *temprambase++; > + } > + /* > + * Set the Buffer count register with transmit length > + * and enable the buffer for transmission. > + */ > + if (ep->is_in) > + udc->write_fn(udc->base_address, ep->offset + > + XUSB_EP_BUF0COUNT_OFFSET, bufferlen); > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, > + 1 << ep->epnumber); > + ep->buffer0ready = 1; > + ep->curbufnum = 1; > + } else if ((ep->curbufnum == 1) && (!ep->buffer1ready)) { > + /* Get the Buffer address and copy the transmit data.*/ > + eprambase = (u32 __force *)(udc->base_address + ep->rambase + > + ep->ep_usb.maxpacket); > + while (bytestosend > 3) { > + if (ep->is_in) > + *eprambase++ = *(u32 *)bufferptr; > + else > + *(u32 *)bufferptr = *eprambase++; > + bufferptr += 4; > + bytestosend -= 4; > + } > + temprambase = (u8 *)eprambase; > + while (bytestosend--) { > + if (ep->is_in) > + *temprambase++ = *bufferptr++; > + else > + *bufferptr++ = *temprambase++; > + } > + /* > + * Set the Buffer count register with transmit > + * length and enable the buffer for > + * transmission. > + */ > + if (ep->is_in) > + udc->write_fn(udc->base_address, ep->offset + > + XUSB_EP_BUF1COUNT_OFFSET, bufferlen); > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, > + 1 << (ep->epnumber + > + XUSB_STATUS_EP_BUFF2_SHIFT)); > + ep->buffer1ready = 1; > + ep->curbufnum = 0; > + } else { > + /* None of the ping-pong buffers are ready currently */ > + return -EAGAIN; > + } > + return rc; > +} > + > +/** > + * xudc_done - Exeutes the endpoint data transfer completion tasks. > + * @ep: pointer to the usb device endpoint structure. > + * @req: pointer to the usb request structure. > + * @status: Status of the data transfer. > + * > + * Deletes the message from the queue and updates data transfer completion > + * status. > + */ > +static void xudc_done(struct xusb_ep *ep, struct xusb_req *req, int status) > +{ > + struct xusb_udc *udc = ep->udc; > + > + list_del_init(&req->queue); > + > + if (req->usb_req.status == -EINPROGRESS) > + req->usb_req.status = status; > + else > + status = req->usb_req.status; > + > + if (status && status != -ESHUTDOWN) > + dev_dbg(udc->dev, "%s done %p, status %d\n", > + ep->ep_usb.name, req, status); > + /* unmap request if DMA is present*/ > + if (udc->dma_enabled && ep->epnumber && req->usb_req.length) > + usb_gadget_unmap_request(&udc->gadget, &req->usb_req, > + ep->is_in); > + > + if (req->usb_req.complete) { > + spin_unlock(&udc->lock); > + req->usb_req.complete(&ep->ep_usb, &req->usb_req); > + spin_lock(&udc->lock); > + } > +} > + > +/** > + * xudc_read_fifo - Reads the data from the given endpoint buffer. > + * @ep: pointer to the usb device endpoint structure. > + * @req: pointer to the usb request structure. > + * > + * Return: 0 if request is completed and -EAGAIN if not completed. > + * > + * Pulls OUT packet data from the endpoint buffer. > + */ > +static int xudc_read_fifo(struct xusb_ep *ep, struct xusb_req *req) > +{ > + u8 *buf; > + u32 is_short, count, bufferspace; > + u8 bufoffset; > + u8 two_pkts = 0; > + int ret; > + int retval = -EAGAIN; > + struct xusb_udc *udc = ep->udc; > + > + if ((ep->buffer0ready == 1) && (ep->buffer1ready == 1)) { > + dev_dbg(udc->dev, "Packet NOT ready!\n"); > + return retval; > + } > +top: > + if (ep->curbufnum) > + bufoffset = XUSB_EP_BUF1COUNT_OFFSET; > + else > + bufoffset = XUSB_EP_BUF0COUNT_OFFSET; > + > + count = udc->read_fn(udc->base_address + ep->offset + bufoffset); > + > + if (!ep->buffer0ready && !ep->buffer1ready) > + two_pkts = 1; > + > + buf = req->usb_req.buf + req->usb_req.actual; > + prefetchw(buf); > + bufferspace = req->usb_req.length - req->usb_req.actual; > + is_short = count < ep->ep_usb.maxpacket; > + > + if (unlikely(!bufferspace)) { > + /* > + * This happens when the driver's buffer > + * is smaller than what the host sent. > + * discard the extra data. > + */ > + if (req->usb_req.status != -EOVERFLOW) > + dev_dbg(udc->dev, > + "%s overflow %d\n", > + ep->ep_usb.name, count); > + req->usb_req.status = -EOVERFLOW; > + xudc_done(ep, req, -EOVERFLOW); > + return 0; > + } > + > + ret = xudc_eptxrx(ep, req, buf, count); > + switch (ret) { > + case 0: > + req->usb_req.actual += min(count, bufferspace); > + dev_dbg(udc->dev, "read %s, %d bytes%s req %p %d/%d\n", > + ep->ep_usb.name, count, is_short ? "/S" : "", req, > + req->usb_req.actual, req->usb_req.length); > + bufferspace -= count; > + /* Completion */ > + if ((req->usb_req.actual == req->usb_req.length) || is_short) { > + if (udc->dma_enabled && req->usb_req.length) > + dma_sync_single_for_cpu(udc->dev, > + req->usb_req.dma, > + req->usb_req.actual, > + DMA_FROM_DEVICE); > + xudc_done(ep, req, 0); > + return 0; > + } > + if (two_pkts) { > + two_pkts = 0; > + goto top; > + } > + break; > + case -EAGAIN: > + dev_dbg(udc->dev, "receive busy\n"); > + break; > + case -EINVAL: > + case -ETIMEDOUT: > + /* DMA error, dequeue the request */ > + xudc_done(ep, req, -ECONNRESET); > + retval = 0; > + break; > + } > + > + return retval; > +} > + > +/** > + * xudc_write_fifo - Writes data into the given endpoint buffer. > + * @ep: pointer to the usb device endpoint structure. > + * @req: pointer to the usb request structure. > + * > + * Return: 0 if request is completed and -EAGAIN if not completed. > + * > + * Loads endpoint buffer for an IN packet. > + */ > +static int xudc_write_fifo(struct xusb_ep *ep, struct xusb_req *req) > +{ > + u32 max; > + u32 length; > + int ret; > + int retval = -EAGAIN; > + struct xusb_udc *udc = ep->udc; > + int is_last, is_short = 0; > + u8 *buf; > + > + max = le16_to_cpu(ep->desc->wMaxPacketSize); > + buf = req->usb_req.buf + req->usb_req.actual; > + prefetch(buf); > + length = req->usb_req.length - req->usb_req.actual; > + length = min(length, max); > + > + ret = xudc_eptxrx(ep, req, buf, length); > + switch (ret) { > + case 0: > + req->usb_req.actual += length; > + if (unlikely(length != max)) { > + is_last = is_short = 1; > + } else { > + if (likely(req->usb_req.length != > + req->usb_req.actual) || req->usb_req.zero) > + is_last = 0; > + else > + is_last = 1; > + } > + dev_dbg(udc->dev, > + "%s: wrote %s %d bytes%s%s %d left %p\n", __func__, > + ep->ep_usb.name, length, is_last ? "/L" : "", > + is_short ? "/S" : "", > + req->usb_req.length - req->usb_req.actual, req); > + /* completion */ > + if (is_last) { > + xudc_done(ep, req, 0); > + retval = 0; > + } > + break; > + case -EAGAIN: > + dev_dbg(udc->dev, "Send busy\n"); > + break; > + case -EINVAL: > + case -ETIMEDOUT: > + /* DMA error, dequeue the request */ > + xudc_done(ep, req, -ECONNRESET); > + retval = 0; > + break; > + } > + > + return retval; > +} > + > +/** > + * xudc_nuke - Cleans up the data transfer message list. > + * @ep: pointer to the usb device endpoint structure. > + * @status: Status of the data transfer. > + */ > +static void xudc_nuke(struct xusb_ep *ep, int status) > +{ > + struct xusb_req *req; > + > + while (!list_empty(&ep->queue)) { > + req = list_first_entry(&ep->queue, struct xusb_req, queue); > + xudc_done(ep, req, status); > + } > +} > + > +/** > + * xudc_ep_set_halt - Stalls/unstalls the given endpoint. > + * @_ep: pointer to the usb device endpoint structure. > + * @value: value to indicate stall/unstall. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_ep_set_halt(struct usb_ep *_ep, int value) > +{ > + struct xusb_ep *ep = to_xusb_ep(_ep); > + struct xusb_udc *udc; > + unsigned long flags; > + u32 epcfgreg; > + > + if (!_ep || (!ep->desc && ep->epnumber)) { > + pr_debug("%s: bad ep or descriptor\n", __func__); > + return -EINVAL; > + } > + udc = ep->udc; > + > + if (ep->is_in && (!list_empty(&ep->queue)) && value) { > + dev_dbg(udc->dev, "requests pending can't halt\n"); > + return -EAGAIN; > + } > + > + if ((ep->buffer0ready == 1) || (ep->buffer1ready == 1)) { > + dev_dbg(udc->dev, "HW buffers busy can't halt\n"); > + return -EAGAIN; > + } > + > + spin_lock_irqsave(&udc->lock, flags); > + > + if (value) { > + /* Stall the device.*/ > + epcfgreg = udc->read_fn(udc->base_address + ep->offset); > + epcfgreg |= XUSB_EP_CFG_STALL_MASK; > + > + udc->write_fn(udc->base_address, ep->offset, epcfgreg); > + } else { > + /* Unstall the device.*/ > + epcfgreg = udc->read_fn(udc->base_address + ep->offset); > + epcfgreg &= ~XUSB_EP_CFG_STALL_MASK; > + udc->write_fn(udc->base_address, ep->offset, epcfgreg); > + if (ep->epnumber) { > + /* Reset the toggle bit.*/ > + epcfgreg = udc->read_fn(ep->udc->base_address + > + ep->offset); > + epcfgreg &= ~XUSB_EP_CFG_DATA_TOGGLE_MASK; > + udc->write_fn(udc->base_address, ep->offset, epcfgreg); > + } > + } > + > + spin_unlock_irqrestore(&udc->lock, flags); > + return 0; > +} > + > +/** > + * xudc_ep_enable - Enables the given endpoint. > + * @ep: pointer to the xusb endpoint structure. > + * @desc: pointer to usb endpoint descriptor. > + * > + * Return: 0 for success and error value on failure > + */ > +static int __xudc_ep_enable(struct xusb_ep *ep, > + const struct usb_endpoint_descriptor *desc) > +{ > + struct xusb_udc *udc = ep->udc; > + u32 tmp; > + u8 eptype = 0; > + u32 epcfg; > + u32 ier; > + > + ep->is_in = ((desc->bEndpointAddress & USB_DIR_IN) != 0); > + /* Bit 3...0:endpoint number */ > + ep->epnumber = (desc->bEndpointAddress & 0x0f); > + ep->desc = desc; > + ep->ep_usb.desc = desc; > + tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; > + ep->ep_usb.maxpacket = le16_to_cpu(desc->wMaxPacketSize); > + > + switch (tmp) { > + case USB_ENDPOINT_XFER_CONTROL: > + dev_dbg(udc->dev, "only one control endpoint\n"); > + /* NON- ISO */ > + eptype = 0; > + return -EINVAL; > + case USB_ENDPOINT_XFER_INT: > + /* NON- ISO */ > + eptype = 0; > + if (ep->ep_usb.maxpacket > 64) > + goto bogus_max; > + break; > + case USB_ENDPOINT_XFER_BULK: > + /* NON- ISO */ > + eptype = 0; > + switch (ep->ep_usb.maxpacket) { > + case 8: > + case 16: > + case 32: > + case 64: > + case 512: > + goto ok; > + } > +bogus_max: > + dev_dbg(udc->dev, "bogus maxpacket %d\n", > + ep->ep_usb.maxpacket); > + return -EINVAL; > + case USB_ENDPOINT_XFER_ISOC: > + /* ISO */ > + eptype = 1; > + ep->is_iso = 1; > + break; > + } > +ok: > + ep->eptype = eptype; > + ep->buffer0ready = 0; > + ep->buffer1ready = 0; > + ep->curbufnum = 0; > + ep->rambase = rambase[ep->epnumber]; > + xudc_epconfig(ep, udc); > + > + dev_dbg(udc->dev, "Enable Endpoint %d max pkt is %d\n", > + ep->epnumber, ep->ep_usb.maxpacket); > + > + /* Enable the End point.*/ > + epcfg = udc->read_fn(udc->base_address + ep->offset); > + epcfg |= XUSB_EP_CFG_VALID_MASK; > + udc->write_fn(udc->base_address, ep->offset, epcfg); > + if (ep->epnumber) > + ep->rambase <<= 2; > + > + /* Enable buffer completion interrupts for endpoint */ > + ier = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + ier |= (XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK << ep->epnumber); > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, ier); > + > + /* for OUT endpoint set buffers ready to receive */ > + if (ep->epnumber && !ep->is_in) { > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, > + 1 << ep->epnumber); > + ep->buffer0ready = 1; > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, > + (1 << (ep->epnumber + > + XUSB_STATUS_EP_BUFF2_SHIFT))); > + ep->buffer1ready = 1; > + } > + > + return 0; > +} > + > +/** > + * xudc_ep_enable - Enables the given endpoint. > + * @_ep: pointer to the usb endpoint structure. > + * @desc: pointer to usb endpoint descriptor. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_ep_enable(struct usb_ep *_ep, > + const struct usb_endpoint_descriptor *desc) > +{ > + struct xusb_ep *ep; > + struct xusb_udc *udc; > + unsigned long flags; > + int ret; > + > + if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { > + pr_debug("%s: bad ep or descriptor\n", __func__); > + return -EINVAL; > + } > + > + ep = to_xusb_ep(_ep); > + udc = ep->udc; > + > + if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { > + dev_dbg(udc->dev, "bogus device state\n"); > + return -ESHUTDOWN; > + } > + > + spin_lock_irqsave(&udc->lock, flags); > + ret = __xudc_ep_enable(ep, desc); > + spin_unlock_irqrestore(&udc->lock, flags); > + > + return ret; > +} > + > +/** > + * xudc_ep_disable - Disables the given endpoint. > + * @_ep: pointer to the usb endpoint structure. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_ep_disable(struct usb_ep *_ep) > +{ > + struct xusb_ep *ep; > + unsigned long flags; > + u32 epcfg; > + struct xusb_udc *udc; > + > + if (!_ep) { > + pr_debug("%s: invalid ep\n", __func__); > + return -EINVAL; > + } > + > + ep = to_xusb_ep(_ep); > + udc = ep->udc; > + > + spin_lock_irqsave(&udc->lock, flags); > + > + xudc_nuke(ep, -ESHUTDOWN); > + > + /* Restore the endpoint's pristine config */ > + ep->desc = NULL; > + ep->ep_usb.desc = NULL; > + > + dev_dbg(udc->dev, "USB Ep %d disable\n ", ep->epnumber); > + /* Disable the endpoint.*/ > + epcfg = udc->read_fn(udc->base_address + ep->offset); > + epcfg &= ~XUSB_EP_CFG_VALID_MASK; > + udc->write_fn(udc->base_address, ep->offset, epcfg); > + > + spin_unlock_irqrestore(&udc->lock, flags); > + return 0; > +} > + > +/** > + * xudc_ep_alloc_request - Initializes the request queue. > + * @_ep: pointer to the usb endpoint structure. > + * @gfp_flags: Flags related to the request call. > + * > + * Return: pointer to request structure on success and a NULL on failure. > + */ > +static struct usb_request *xudc_ep_alloc_request(struct usb_ep *_ep, > + gfp_t gfp_flags) > +{ > + struct xusb_ep *ep = to_xusb_ep(_ep); > + struct xusb_udc *udc; > + struct xusb_req *req; > + > + udc = ep->udc; > + req = kzalloc(sizeof(*req), gfp_flags); > + if (!req) { > + dev_err(udc->dev, "not enough memory"); > + return NULL; > + } > + > + req->ep = ep; > + INIT_LIST_HEAD(&req->queue); > + return &req->usb_req; > +} > + > +/** > + * xudc_free_request - Releases the request from queue. > + * @_ep: pointer to the usb device endpoint structure. > + * @_req: pointer to the usb request structure. > + */ > +static void xudc_free_request(struct usb_ep *_ep, struct usb_request *_req) > +{ > + struct xusb_req *req = to_xusb_req(_req); > + > + kfree(req); > +} > + > +/** > + * xudc_ep0_queue - Adds the request to endpoint 0 queue. > + * @ep0: pointer to the xusb endpoint 0 structure. > + * @req: pointer to the xusb request structure. > + * > + * Return: 0 for success and error value on failure > + */ > +static int __xudc_ep0_queue(struct xusb_ep *ep0, struct xusb_req *req) > +{ > + struct xusb_udc *udc = ep0->udc; > + u32 length; > + u8 *corebuf; > + > + if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { > + dev_dbg(udc->dev, "%s, bogus device state\n", > + __func__); > + return -EINVAL; > + } > + if (!list_empty(&ep0->queue)) { > + dev_dbg(udc->dev, "%s:ep0 busy\n", __func__); > + return -EBUSY; > + } > + > + req->usb_req.status = -EINPROGRESS; > + req->usb_req.actual = 0; > + > + list_add_tail(&req->queue, &ep0->queue); > + > + if (udc->setup.bRequestType & USB_DIR_IN) { > + prefetch(req->usb_req.buf); > + length = req->usb_req.length; > + corebuf = (void __force *) ((ep0->rambase << 2) + > + udc->base_address); > + length = req->usb_req.actual = min_t(u32, length, > + EP0_MAX_PACKET); > + memcpy((void *)corebuf, req->usb_req.buf, length); > + udc->write_fn(udc->base_address, XUSB_EP_BUF0COUNT_OFFSET, > + length); > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, 1); > + } else { > + if (udc->setup.wLength) { > + /* Enable EP0 buffer to receive data */ > + udc->write_fn(udc->base_address, > + XUSB_EP_BUF0COUNT_OFFSET, 0); > + udc->write_fn(udc->base_address, > + XUSB_BUFFREADY_OFFSET, 1); > + } else { > + xudc_wrstatus(udc); > + } > + } > + > + return 0; > +} > + > +/** > + * xudc_ep0_queue - Adds the request to endpoint 0 queue. > + * @_ep: pointer to the usb endpoint 0 structure. > + * @_req: pointer to the usb request structure. > + * @gfp_flags: Flags related to the request call. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_ep0_queue(struct usb_ep *_ep, struct usb_request *_req, > + gfp_t gfp_flags) > +{ > + struct xusb_req *req = to_xusb_req(_req); > + struct xusb_ep *ep0 = to_xusb_ep(_ep); > + struct xusb_udc *udc = ep0->udc; > + unsigned long flags; > + int ret; > + > + spin_lock_irqsave(&udc->lock, flags); > + ret = __xudc_ep0_queue(ep0, req); > + spin_unlock_irqrestore(&udc->lock, flags); > + > + return ret; > +} > + > +/** > + * xudc_ep_queue - Adds the request to endpoint queue. > + * @_ep: pointer to the usb endpoint structure. > + * @_req: pointer to the usb request structure. > + * @gfp_flags: Flags related to the request call. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_ep_queue(struct usb_ep *_ep, struct usb_request *_req, > + gfp_t gfp_flags) > +{ > + struct xusb_req *req = to_xusb_req(_req); > + struct xusb_ep *ep = to_xusb_ep(_ep); > + struct xusb_udc *udc = ep->udc; > + int ret; > + unsigned long flags; > + > + if (!ep->desc) { > + dev_dbg(udc->dev, "%s:queing request to disabled %s\n", > + __func__, ep->name); > + return -ESHUTDOWN; > + } > + > + if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { > + dev_dbg(udc->dev, "%s, bogus device state\n", > + __func__); > + return -EINVAL; > + } > + > + spin_lock_irqsave(&udc->lock, flags); > + > + _req->status = -EINPROGRESS; > + _req->actual = 0; > + > + if (udc->dma_enabled) { > + ret = usb_gadget_map_request(&udc->gadget, > + &req->usb_req, ep->is_in); > + if (ret) { > + dev_dbg(udc->dev, "gadget_map failed ep%d\n", > + ep->epnumber); > + spin_unlock_irqrestore(&udc->lock, flags); > + return -EAGAIN; > + } > + } > + > + /* > + * Start processing requests now, if IP buffers are busy with > + * previous transactions or data is more than max packet > + * size then add requests to queue otherwise finish the work > + * and call completion. > + */ > + if (list_empty(&ep->queue)) { > + if (ep->is_in) { > + dev_dbg(udc->dev, "xudc_write_fifo from ep_queue\n"); > + if (!xudc_write_fifo(ep, req)) > + req = NULL; > + } else { > + dev_dbg(udc->dev, "xudc_read_fifo from ep_queue\n"); > + if (!xudc_read_fifo(ep, req)) > + req = NULL; > + } > + } > + > + if (req != NULL) > + list_add_tail(&req->queue, &ep->queue); > + > + spin_unlock_irqrestore(&udc->lock, flags); > + return 0; > +} > + > +/** > + * xudc_ep_dequeue - Removes the request from the queue. > + * @_ep: pointer to the usb device endpoint structure. > + * @_req: pointer to the usb request structure. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) > +{ > + struct xusb_ep *ep = to_xusb_ep(_ep); > + struct xusb_req *req = to_xusb_req(_req); > + struct xusb_udc *udc = ep->udc; > + unsigned long flags; > + > + if (ep->ep_usb.name == ep0name) > + return -EINVAL; > + > + spin_lock_irqsave(&udc->lock, flags); > + /* Make sure it's actually queued on this endpoint */ > + list_for_each_entry(req, &ep->queue, queue) { > + if (&req->usb_req == _req) > + break; > + } > + if (&req->usb_req != _req) { > + spin_unlock_irqrestore(&ep->udc->lock, flags); > + return -EINVAL; > + } > + xudc_done(ep, req, -ECONNRESET); > + spin_unlock_irqrestore(&udc->lock, flags); > + > + return 0; > +} > + > +/** > + * xudc_ep0_enable - Enables the given endpoint. > + * @ep: pointer to the usb endpoint structure. > + * @desc: pointer to usb endpoint descriptor. > + * > + * Return: error always. > + * > + * endpoint 0 enable should not be called by gadget layer. > + */ > +static int xudc_ep0_enable(struct usb_ep *ep, > + const struct usb_endpoint_descriptor *desc) > +{ > + return -EINVAL; > +} > + > +/** > + * xudc_ep0_disable - Disables the given endpoint. > + * @ep: pointer to the usb endpoint structure. > + * > + * Return: error always. > + * > + * endpoint 0 disable should not be called by gadget layer. > + */ > +static int xudc_ep0_disable(struct usb_ep *ep) > +{ > + return -EINVAL; > +} > + > +static const struct usb_ep_ops xusb_ep0_ops = { > + .enable = xudc_ep0_enable, > + .disable = xudc_ep0_disable, > + .alloc_request = xudc_ep_alloc_request, > + .free_request = xudc_free_request, > + .queue = xudc_ep0_queue, > + .dequeue = xudc_ep_dequeue, > + .set_halt = xudc_ep_set_halt, > +}; > + > +static const struct usb_ep_ops xusb_ep_ops = { > + .enable = xudc_ep_enable, > + .disable = xudc_ep_disable, > + .alloc_request = xudc_ep_alloc_request, > + .free_request = xudc_free_request, > + .queue = xudc_ep_queue, > + .dequeue = xudc_ep_dequeue, > + .set_halt = xudc_ep_set_halt, > +}; > + > +/** > + * xudc_get_frame - Reads the current usb frame number. > + * @gadget: pointer to the usb gadget structure. > + * > + * Return: current frame number for success and error value on failure. > + */ > +static int xudc_get_frame(struct usb_gadget *gadget) > +{ > + struct xusb_udc *udc; > + int frame; > + > + if (!gadget) > + return -ENODEV; > + > + udc = to_udc(gadget); > + frame = udc->read_fn(udc->base_address + XUSB_FRAMENUM_OFFSET); > + return frame; > +} > + > +/** > + * xudc_wakeup - Send remote wakeup signal to host > + * @gadget: pointer to the usb gadget structure. > + * > + * Return: 0 on success and error on failure > + */ > +static int xudc_wakeup(struct usb_gadget *gadget) > +{ > + struct xusb_udc *udc = to_udc(gadget); > + u32 crtlreg; > + int status = -EINVAL; > + unsigned long flags; > + > + spin_lock_irqsave(&udc->lock, flags); > + > + /* Remote wake up not enabled by host */ > + if (!udc->remote_wkp) > + goto done; > + > + crtlreg = udc->read_fn(udc->base_address + XUSB_CONTROL_OFFSET); > + crtlreg |= XUSB_CONTROL_USB_RMTWAKE_MASK; > + /* set remote wake up bit */ > + udc->write_fn(udc->base_address, XUSB_CONTROL_OFFSET, crtlreg); > + /* > + * wait for a while and reset remote wake up bit since this bit > + * is not cleared by HW after sending remote wakeup to host. > + */ > + mdelay(2); > + > + crtlreg &= ~XUSB_CONTROL_USB_RMTWAKE_MASK; > + udc->write_fn(udc->base_address, XUSB_CONTROL_OFFSET, crtlreg); > + status = 0; > +done: > + spin_unlock_irqrestore(&udc->lock, flags); > + return status; > +} > + > +/** > + * xudc_pullup - start/stop USB traffic > + * @gadget: pointer to the usb gadget structure. > + * @is_on: flag to start or stop > + * > + * Return: 0 always > + * > + * This function starts/stops SIE engine of IP based on is_on. > + */ > +static int xudc_pullup(struct usb_gadget *gadget, int is_on) > +{ > + struct xusb_udc *udc = to_udc(gadget); > + unsigned long flags; > + u32 crtlreg; > + > + spin_lock_irqsave(&udc->lock, flags); > + > + crtlreg = udc->read_fn(udc->base_address + XUSB_CONTROL_OFFSET); > + if (is_on) > + crtlreg |= XUSB_CONTROL_USB_READY_MASK; > + else > + crtlreg &= ~XUSB_CONTROL_USB_READY_MASK; > + > + udc->write_fn(udc->base_address, XUSB_CONTROL_OFFSET, crtlreg); > + > + spin_unlock_irqrestore(&udc->lock, flags); > + > + return 0; > +} > + > +/** > + * xudc_eps_init - initialize endpoints. > + * @udc: pointer to the usb device controller structure. > + */ > +static void xudc_eps_init(struct xusb_udc *udc) > +{ > + u32 ep_number; > + char name[4]; > + > + INIT_LIST_HEAD(&udc->gadget.ep_list); > + > + for (ep_number = 0; ep_number < XUSB_MAX_ENDPOINTS; ep_number++) { > + struct xusb_ep *ep = &udc->ep[ep_number]; > + > + if (ep_number) { > + list_add_tail(&ep->ep_usb.ep_list, > + &udc->gadget.ep_list); > + usb_ep_set_maxpacket_limit(&ep->ep_usb, > + (unsigned short) ~0); > + sprintf(name, "ep%d", ep_number); > + strcpy(ep->name, name); > + ep->ep_usb.name = ep->name; > + ep->ep_usb.ops = &xusb_ep_ops; > + } else { > + ep->ep_usb.name = ep0name; > + usb_ep_set_maxpacket_limit(&ep->ep_usb, 64); > + ep->ep_usb.ops = &xusb_ep0_ops; > + } > + > + ep->udc = udc; > + ep->epnumber = ep_number; > + ep->desc = NULL; > + /* > + * The configuration register address offset between > + * each endpoint is 0x10. > + */ > + ep->offset = XUSB_EP0_CONFIG_OFFSET + > + (ep_number * 0x10); > + ep->is_in = 0; > + ep->is_iso = 0; > + ep->maxpacket = 0; > + xudc_epconfig(ep, udc); > + > + /* Initialize one queue per endpoint */ > + INIT_LIST_HEAD(&ep->queue); > + } > +} > + > +/** > + * xudc_stop_activity - Stops any further activity on the device. > + * @udc: pointer to the usb device controller structure. > + */ > +static void xudc_stop_activity(struct xusb_udc *udc) > +{ > + int i; > + struct xusb_ep *ep; > + > + for (i = 0; i < XUSB_MAX_ENDPOINTS; i++) { > + ep = &udc->ep[i]; > + xudc_nuke(ep, -ESHUTDOWN); > + } > +} > + > +/** > + * xudc_start - Starts the device. > + * @gadget: pointer to the usb gadget structure > + * @driver: pointer to gadget driver structure > + * > + * Return: zero on success and error on failure > + */ > +static int xudc_start(struct usb_gadget *gadget, > + struct usb_gadget_driver *driver) > +{ > + struct xusb_udc *udc = to_udc(gadget); > + struct xusb_ep *ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO]; > + const struct usb_endpoint_descriptor *desc = &config_bulk_out_desc; > + unsigned long flags; > + int ret = 0; > + > + spin_lock_irqsave(&udc->lock, flags); > + > + if (udc->driver) { > + dev_err(udc->dev, "%s is already bound to %s\n", > + udc->gadget.name, udc->driver->driver.name); > + ret = -EBUSY; > + goto err; > + } > + > + /* hook up the driver */ > + udc->driver = driver; > + udc->gadget.speed = driver->max_speed; > + > + /* Enable the control endpoint. */ > + ret = __xudc_ep_enable(ep0, desc); > + > + /* Set device address and remote wakeup to 0 */ > + udc->write_fn(udc->base_address, XUSB_ADDRESS_OFFSET, 0); > + udc->remote_wkp = 0; > +err: > + spin_unlock_irqrestore(&udc->lock, flags); > + return ret; > +} > + > +/** > + * xudc_stop - stops the device. > + * @gadget: pointer to the usb gadget structure > + * @driver: pointer to usb gadget driver structure > + * > + * Return: zero always > + */ > +static int xudc_stop(struct usb_gadget *gadget, > + struct usb_gadget_driver *driver) > +{ > + struct xusb_udc *udc = to_udc(gadget); > + unsigned long flags; > + > + spin_lock_irqsave(&udc->lock, flags); > + > + udc->gadget.speed = USB_SPEED_UNKNOWN; > + udc->driver = NULL; > + > + /* Set device address and remote wakeup to 0 */ > + udc->write_fn(udc->base_address, XUSB_ADDRESS_OFFSET, 0); > + udc->remote_wkp = 0; > + > + xudc_stop_activity(udc); > + > + spin_unlock_irqrestore(&udc->lock, flags); > + > + return 0; > +} > + > +static const struct usb_gadget_ops xusb_udc_ops = { > + .get_frame = xudc_get_frame, > + .wakeup = xudc_wakeup, > + .pullup = xudc_pullup, > + .udc_start = xudc_start, > + .udc_stop = xudc_stop, > +}; > + > +/** > + * xudc_clear_stall_all_ep - clears stall of every endpoint. > + * @udc: pointer to the udc structure. > + */ > +static void xudc_clear_stall_all_ep(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep; > + u32 epcfgreg; > + int i; > + > + for (i = 0; i < XUSB_MAX_ENDPOINTS; i++) { > + ep = &udc->ep[i]; > + epcfgreg = udc->read_fn(udc->base_address + ep->offset); > + epcfgreg &= ~XUSB_EP_CFG_STALL_MASK; > + udc->write_fn(udc->base_address, ep->offset, epcfgreg); > + if (ep->epnumber) { > + /* Reset the toggle bit.*/ > + epcfgreg = udc->read_fn(ep->udc->base_address + > + ep->offset); > + epcfgreg &= ~XUSB_EP_CFG_DATA_TOGGLE_MASK; > + udc->write_fn(udc->base_address, ep->offset, epcfgreg); > + } > + } > +} > + > +/** > + * xudc_startup_handler - The usb device controller interrupt handler. > + * @udc: pointer to the udc structure. > + * @intrstatus: The mask value containing the interrupt sources. > + * > + * This function handles the RESET,SUSPEND,RESUME and DISCONNECT interrupts. > + */ > +static void xudc_startup_handler(struct xusb_udc *udc, u32 intrstatus) > +{ > + u32 intrreg; > + > + if (intrstatus & XUSB_STATUS_RESET_MASK) { > + > + dev_dbg(udc->dev, "Reset\n"); > + > + if (intrstatus & XUSB_STATUS_HIGH_SPEED_MASK) > + udc->gadget.speed = USB_SPEED_HIGH; > + else > + udc->gadget.speed = USB_SPEED_FULL; > + > + xudc_stop_activity(udc); > + xudc_clear_stall_all_ep(udc); > + udc->write_fn(udc->base_address, XUSB_TESTMODE_OFFSET, 0); > + > + /* Set device address and remote wakeup to 0 */ > + udc->write_fn(udc->base_address, XUSB_ADDRESS_OFFSET, 0); > + udc->remote_wkp = 0; > + > + /* Enable the suspend, resume and disconnect */ > + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + intrreg |= XUSB_STATUS_SUSPEND_MASK | XUSB_STATUS_RESUME_MASK | > + XUSB_STATUS_DISCONNECT_MASK; > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, intrreg); > + } > + if (intrstatus & XUSB_STATUS_SUSPEND_MASK) { > + > + dev_dbg(udc->dev, "Suspend\n"); > + > + /* Enable the reset, resume and disconnect */ > + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_RESUME_MASK | > + XUSB_STATUS_DISCONNECT_MASK; > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, intrreg); > + > + udc->usb_state = USB_STATE_SUSPENDED; > + > + if (udc->driver->suspend) { > + spin_unlock(&udc->lock); > + udc->driver->suspend(&udc->gadget); > + spin_lock(&udc->lock); > + } > + } > + if (intrstatus & XUSB_STATUS_RESUME_MASK) { > + bool condition = (udc->usb_state != USB_STATE_SUSPENDED); > + > + dev_WARN_ONCE(udc->dev, condition, > + "Resume IRQ while not suspended\n"); > + > + dev_dbg(udc->dev, "Resume\n"); > + > + /* Enable the reset, suspend and disconnect */ > + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_SUSPEND_MASK | > + XUSB_STATUS_DISCONNECT_MASK; > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, intrreg); > + > + udc->usb_state = 0; > + > + if (udc->driver->resume) { > + spin_unlock(&udc->lock); > + udc->driver->resume(&udc->gadget); > + spin_lock(&udc->lock); > + } > + } > + if (intrstatus & XUSB_STATUS_DISCONNECT_MASK) { > + > + dev_dbg(udc->dev, "Disconnect\n"); > + > + /* Enable the reset, resume and suspend */ > + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_RESUME_MASK | > + XUSB_STATUS_SUSPEND_MASK; > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, intrreg); > + > + if (udc->driver && udc->driver->disconnect) { > + spin_unlock(&udc->lock); > + udc->driver->disconnect(&udc->gadget); > + spin_lock(&udc->lock); > + } > + } > +} > + > +/** > + * xudc_ep0_stall - Stall endpoint zero. > + * @udc: pointer to the udc structure. > + * > + * This function stalls endpoint zero. > + */ > +static void xudc_ep0_stall(struct xusb_udc *udc) > +{ > + u32 epcfgreg; > + struct xusb_ep *ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO]; > + > + epcfgreg = udc->read_fn(udc->base_address + ep0->offset); > + epcfgreg |= XUSB_EP_CFG_STALL_MASK; > + udc->write_fn(udc->base_address, ep0->offset, epcfgreg); > +} > + > +/** > + * xudc_setaddress - executes SET_ADDRESS command > + * @udc: pointer to the udc structure. > + * > + * This function executes USB SET_ADDRESS command > + */ > +static void xudc_setaddress(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[0]; > + struct xusb_req *req = udc->req; > + int ret; > + > + req->usb_req.length = 0; > + ret = __xudc_ep0_queue(ep0, req); > + if (ret == 0) > + return; > + > + dev_err(udc->dev, "Can't respond to SET ADDRESS request\n"); > + xudc_ep0_stall(udc); > + return; > +} > + > +/** > + * xudc_getstatus - executes GET_STATUS command > + * @udc: pointer to the udc structure. > + * > + * This function executes USB GET_STATUS command > + */ > +static void xudc_getstatus(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[0]; > + struct xusb_req *req = udc->req; > + struct xusb_ep *target_ep; > + u16 status = 0; > + u32 epcfgreg; > + int epnum; > + u32 halt; > + int ret; > + > + switch (udc->setup.bRequestType & USB_RECIP_MASK) { > + case USB_RECIP_DEVICE: > + /* Get device status */ > + status = 1 << USB_DEVICE_SELF_POWERED; > + if (udc->remote_wkp) > + status |= (1 << USB_DEVICE_REMOTE_WAKEUP); > + break; > + case USB_RECIP_INTERFACE: > + break; > + case USB_RECIP_ENDPOINT: > + epnum = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK; > + target_ep = &udc->ep[epnum]; > + epcfgreg = udc->read_fn(udc->base_address + target_ep->offset); > + halt = epcfgreg & XUSB_EP_CFG_STALL_MASK; > + if (udc->setup.wIndex & USB_DIR_IN) { > + if (!target_ep->is_in) > + goto stall; > + } else { > + if (target_ep->is_in) > + goto stall; > + } > + if (halt) > + status = 1 << USB_ENDPOINT_HALT; > + break; > + default: > + goto stall; > + } > + > + req->usb_req.length = 2; > + *(u16 *)req->usb_req.buf = cpu_to_le16(status); > + ret = __xudc_ep0_queue(ep0, req); > + if (ret == 0) > + return; > +stall: > + dev_err(udc->dev, "Can't respond to getstatus request\n"); > + xudc_ep0_stall(udc); > + return; > +} > + > +/** > + * xudc_set_clear_feature - Executes the set feature and clear feature commands. > + * @udc: pointer to the usb device controller structure. > + * > + * Processes the SET_FEATURE and CLEAR_FEATURE commands. > + */ > +static void xudc_set_clear_feature(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[0]; > + struct xusb_req *req = udc->req; > + struct xusb_ep *target_ep; > + u8 endpoint; > + u8 outinbit; > + u32 epcfgreg; > + int flag = (udc->setup.bRequest == USB_REQ_SET_FEATURE ? 1 : 0); > + int ret; > + > + switch (udc->setup.bRequestType) { > + case USB_RECIP_DEVICE: > + switch (udc->setup.wValue) { > + case USB_DEVICE_TEST_MODE: > + /* > + * The Test Mode will be executed > + * after the status phase. > + */ > + break; > + case USB_DEVICE_REMOTE_WAKEUP: > + if (flag) > + udc->remote_wkp = 1; > + else > + udc->remote_wkp = 0; > + break; > + default: > + xudc_ep0_stall(udc); > + break; > + } > + break; > + case USB_RECIP_ENDPOINT: > + if (!udc->setup.wValue) { > + endpoint = udc->setup.wIndex & > + USB_ENDPOINT_NUMBER_MASK; > + target_ep = &udc->ep[endpoint]; > + outinbit = udc->setup.wIndex & > + USB_ENDPOINT_DIR_MASK; > + outinbit = outinbit >> 7; > + > + /* Make sure direction matches.*/ > + if (outinbit != target_ep->is_in) { > + xudc_ep0_stall(udc); > + return; > + } > + epcfgreg = udc->read_fn(udc->base_address + > + target_ep->offset); > + if (!endpoint) { > + /* Clear the stall.*/ > + epcfgreg &= ~XUSB_EP_CFG_STALL_MASK; > + udc->write_fn(udc->base_address, > + target_ep->offset, epcfgreg); > + } else { > + if (flag) { > + epcfgreg |= XUSB_EP_CFG_STALL_MASK; > + udc->write_fn(udc->base_address, > + target_ep->offset, > + epcfgreg); > + } else { > + /* Unstall the endpoint.*/ > + epcfgreg &= ~(XUSB_EP_CFG_STALL_MASK | > + XUSB_EP_CFG_DATA_TOGGLE_MASK); > + udc->write_fn(udc->base_address, > + target_ep->offset, > + epcfgreg); > + } > + } > + } > + break; > + default: > + xudc_ep0_stall(udc); > + return; > + } > + > + req->usb_req.length = 0; > + ret = __xudc_ep0_queue(ep0, req); > + if (ret == 0) > + return; > + > + dev_err(udc->dev, "Can't respond to SET/CLEAR FEATURE\n"); > + xudc_ep0_stall(udc); > + > + return; > +} > + > +/** > + * xudc_handle_setup - Processes the setup packet. > + * @udc: pointer to the usb device controller structure. > + * > + * Process setup packet and delegate to gadget layer. > + */ > +static void xudc_handle_setup(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[0]; > + struct usb_ctrlrequest setup; > + u32 *ep0rambase; > + > + /* Load up the chapter 9 command buffer.*/ > + ep0rambase = (u32 __force *) (udc->base_address + > + XUSB_SETUP_PKT_ADDR_OFFSET); > + memcpy((void *)&setup, (void *)ep0rambase, 8); > + > + udc->setup = setup; > + > + udc->setup.wValue = cpu_to_le16(setup.wValue); > + udc->setup.wIndex = cpu_to_le16(setup.wIndex); > + udc->setup.wLength = cpu_to_le16(setup.wLength); > + > + /* Clear previous requests */ > + xudc_nuke(ep0, -ECONNRESET); > + > + if (udc->setup.bRequestType & USB_DIR_IN) { > + /* Execute the get command.*/ > + udc->setupseqrx = STATUS_PHASE; > + udc->setupseqtx = DATA_PHASE; > + } else { > + /* Execute the put command.*/ > + udc->setupseqrx = DATA_PHASE; > + udc->setupseqtx = STATUS_PHASE; > + } > + > + switch (udc->setup.bRequest) { > + case USB_REQ_GET_STATUS: > + /* Data+Status phase form udc */ > + if ((udc->setup.bRequestType & > + (USB_DIR_IN | USB_TYPE_MASK)) != > + (USB_DIR_IN | USB_TYPE_STANDARD)) > + break; > + xudc_getstatus(udc); > + return; > + case USB_REQ_SET_ADDRESS: > + /* Status phase from udc */ > + if (udc->setup.bRequestType != (USB_DIR_OUT | > + USB_TYPE_STANDARD | USB_RECIP_DEVICE)) > + break; > + xudc_setaddress(udc); > + return; > + case USB_REQ_CLEAR_FEATURE: > + case USB_REQ_SET_FEATURE: > + /* Requests with no data phase, status phase from udc */ > + if ((udc->setup.bRequestType & USB_TYPE_MASK) > + != USB_TYPE_STANDARD) > + break; > + xudc_set_clear_feature(udc); > + return; > + default: > + break; > + } > + > + spin_unlock(&udc->lock); > + if (udc->driver->setup(&udc->gadget, &setup) < 0) > + xudc_ep0_stall(udc); > + spin_lock(&udc->lock); > +} > + > +/** > + * xudc_ep0_out - Processes the endpoint 0 OUT token. > + * @udc: pointer to the usb device controller structure. > + */ > +static void xudc_ep0_out(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[0]; > + struct xusb_req *req; > + u8 *ep0rambase; > + unsigned int bytes_to_rx; > + void *buffer; > + > + req = list_first_entry(&ep0->queue, struct xusb_req, queue); > + > + switch (udc->setupseqrx) { > + case STATUS_PHASE: > + /* > + * This resets both state machines for the next > + * Setup packet. > + */ > + udc->setupseqrx = SETUP_PHASE; > + udc->setupseqtx = SETUP_PHASE; > + req->usb_req.actual = req->usb_req.length; > + xudc_done(ep0, req, 0); > + break; > + case DATA_PHASE: > + bytes_to_rx = udc->read_fn(udc->base_address + > + XUSB_EP_BUF0COUNT_OFFSET); > + /* Copy the data to be received from the DPRAM. */ > + ep0rambase = (u8 __force *) (udc->base_address + > + (ep0->rambase << 2)); > + > + buffer = req->usb_req.buf + req->usb_req.actual; > + req->usb_req.actual = req->usb_req.actual + bytes_to_rx; > + memcpy(buffer, (void *)ep0rambase, bytes_to_rx); > + > + if (req->usb_req.length == req->usb_req.actual) { > + /* Data transfer completed get ready for Status stage */ > + xudc_wrstatus(udc); > + } else { > + /* Enable EP0 buffer to receive data */ > + udc->write_fn(udc->base_address, > + XUSB_EP_BUF0COUNT_OFFSET, 0); > + udc->write_fn(udc->base_address, > + XUSB_BUFFREADY_OFFSET, 1); > + } > + break; > + default: > + break; > + } > +} > + > +/** > + * xudc_ep0_in - Processes the endpoint 0 IN token. > + * @udc: pointer to the usb device controller structure. > + */ > +static void xudc_ep0_in(struct xusb_udc *udc) > +{ > + struct xusb_ep *ep0 = &udc->ep[0]; > + struct xusb_req *req; > + unsigned int bytes_to_tx; > + void *buffer; > + u32 epcfgreg; > + u16 count = 0; > + u16 length; > + u8 *ep0rambase; > + u8 test_mode = udc->setup.wIndex >> 8; > + > + req = list_first_entry(&ep0->queue, struct xusb_req, queue); > + bytes_to_tx = req->usb_req.length - req->usb_req.actual; > + > + switch (udc->setupseqtx) { > + case STATUS_PHASE: > + switch (udc->setup.bRequest) { > + case USB_REQ_SET_ADDRESS: > + /* Set the address of the device.*/ > + udc->write_fn(udc->base_address, > + XUSB_ADDRESS_OFFSET, > + udc->setup.wValue); > + break; > + case USB_REQ_SET_FEATURE: > + if (udc->setup.bRequestType == > + USB_RECIP_DEVICE) { > + if (udc->setup.wValue == > + USB_DEVICE_TEST_MODE) > + udc->write_fn(udc->base_address, > + XUSB_TESTMODE_OFFSET, > + test_mode); > + } > + break; > + } > + req->usb_req.actual = req->usb_req.length; > + xudc_done(ep0, req, 0); > + break; > + case DATA_PHASE: > + if (!bytes_to_tx) { > + /* > + * We're done with data transfer, next > + * will be zero length OUT with data toggle of > + * 1. Setup data_toggle. > + */ > + epcfgreg = udc->read_fn(udc->base_address + > + ep0->offset); > + epcfgreg |= XUSB_EP_CFG_DATA_TOGGLE_MASK; > + udc->write_fn(udc->base_address, ep0->offset, epcfgreg); > + udc->setupseqtx = STATUS_PHASE; > + } else { > + length = count = min_t(u32, bytes_to_tx, > + EP0_MAX_PACKET); > + /* Copy the data to be transmitted into the DPRAM. */ > + ep0rambase = (u8 __force *) (udc->base_address + > + (ep0->rambase << 2)); > + > + buffer = req->usb_req.buf + req->usb_req.actual; > + req->usb_req.actual = req->usb_req.actual + length; > + memcpy((void *)ep0rambase, buffer, length); > + } > + udc->write_fn(udc->base_address, XUSB_EP_BUF0COUNT_OFFSET, > + count); > + udc->write_fn(udc->base_address, XUSB_BUFFREADY_OFFSET, 1); > + break; > + default: > + break; > + } > +} > + > +/** > + * xudc_ctrl_ep_handler - Endpoint 0 interrupt handler. > + * @udc: pointer to the udc structure. > + * @intrstatus: It's the mask value for the interrupt sources on endpoint 0. > + * > + * Processes the commands received during enumeration phase. > + */ > +static void xudc_ctrl_ep_handler(struct xusb_udc *udc, u32 intrstatus) > +{ > + > + if (intrstatus & XUSB_STATUS_SETUP_PACKET_MASK) { > + xudc_handle_setup(udc); > + } else { > + if (intrstatus & XUSB_STATUS_FIFO_BUFF_RDY_MASK) > + xudc_ep0_out(udc); > + else if (intrstatus & XUSB_STATUS_FIFO_BUFF_FREE_MASK) > + xudc_ep0_in(udc); > + } > +} > + > +/** > + * xudc_nonctrl_ep_handler - Non control endpoint interrupt handler. > + * @udc: pointer to the udc structure. > + * @epnum: End point number for which the interrupt is to be processed > + * @intrstatus: mask value for interrupt sources of endpoints other > + * than endpoint 0. > + * > + * Processes the buffer completion interrupts. > + */ > +static void xudc_nonctrl_ep_handler(struct xusb_udc *udc, u8 epnum, > + u32 intrstatus) > +{ > + > + struct xusb_req *req; > + struct xusb_ep *ep; > + > + ep = &udc->ep[epnum]; > + /* Process the End point interrupts.*/ > + if (intrstatus & (XUSB_STATUS_EP0_BUFF1_COMP_MASK << epnum)) > + ep->buffer0ready = 0; > + if (intrstatus & (XUSB_STATUS_EP0_BUFF2_COMP_MASK << epnum)) > + ep->buffer1ready = 0; > + > + if (list_empty(&ep->queue)) > + return; > + > + req = list_first_entry(&ep->queue, struct xusb_req, queue); > + > + if (ep->is_in) > + xudc_write_fifo(ep, req); > + else > + xudc_read_fifo(ep, req); > +} > + > +/** > + * xudc_irq - The main interrupt handler. > + * @irq: The interrupt number. > + * @_udc: pointer to the usb device controller structure. > + * > + * Return: IRQ_HANDLED after the interrupt is handled. > + */ > +static irqreturn_t xudc_irq(int irq, void *_udc) > +{ > + struct xusb_udc *udc = _udc; > + u32 intrstatus; > + u32 ier; > + u8 index; > + u32 bufintr; > + unsigned long flags; > + > + spin_lock_irqsave(&udc->lock, flags); > + > + /* > + * Event interrupts are level sensitive hence first disable > + * IER, read ISR and figure out active interrupts. > + */ > + ier = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + ier &= ~XUSB_STATUS_INTR_EVENT_MASK; > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, ier); > + > + /* Read the Interrupt Status Register.*/ > + intrstatus = udc->read_fn(udc->base_address + XUSB_STATUS_OFFSET); > + > + /* Call the handler for the event interrupt.*/ > + if (intrstatus & XUSB_STATUS_INTR_EVENT_MASK) { > + /* > + * Check if there is any action to be done for : > + * - USB Reset received {XUSB_STATUS_RESET_MASK} > + * - USB Suspend received {XUSB_STATUS_SUSPEND_MASK} > + * - USB Resume received {XUSB_STATUS_RESUME_MASK} > + * - USB Disconnect received {XUSB_STATUS_DISCONNECT_MASK} > + */ > + xudc_startup_handler(udc, intrstatus); > + } > + > + /* Check the buffer completion interrupts */ > + if (intrstatus & XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK) { > + /* Enable Reset, Suspend, Resume and Disconnect */ > + ier = udc->read_fn(udc->base_address + XUSB_IER_OFFSET); > + ier |= XUSB_STATUS_INTR_EVENT_MASK; > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, ier); > + > + if (intrstatus & XUSB_STATUS_EP0_BUFF1_COMP_MASK) > + xudc_ctrl_ep_handler(udc, intrstatus); > + > + for (index = 1; index < 8; index++) { > + bufintr = ((intrstatus & > + (XUSB_STATUS_EP1_BUFF1_COMP_MASK << > + (index - 1))) || > + (intrstatus & > + (XUSB_STATUS_EP1_BUFF2_COMP_MASK << > + (index - 1)))); > + if (bufintr) { > + xudc_nonctrl_ep_handler(udc, index, > + intrstatus); > + } > + } > + } > + > + spin_unlock_irqrestore(&udc->lock, flags); > + return IRQ_HANDLED; > +} > + > +/** > + * xudc_probe - The device probe function for driver initialization. > + * @pdev: pointer to the platform device structure. > + * > + * Return: 0 for success and error value on failure > + */ > +static int xudc_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct resource *res; > + struct xusb_udc *udc; > + struct xusb_ep *ep0; > + int irq; > + int ret; > + u32 ier; > + u8 *buff; > + > + udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL); > + if (!udc) > + return -ENOMEM; > + > + /* Map the registers */ > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + udc->base_address = devm_ioremap_resource(&pdev->dev, res); > + if (!udc->base_address) > + return -ENOMEM; > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) { > + dev_err(&pdev->dev, "unable to get irq\n"); > + return irq; > + } > + ret = devm_request_irq(&pdev->dev, irq, xudc_irq, 0, > + dev_name(&pdev->dev), udc); > + if (ret < 0) { > + dev_dbg(&pdev->dev, "unable to request irq %d", irq); > + goto fail; > + } > + > + udc->dma_enabled = of_property_read_bool(np, "xlnx,has-builtin-dma"); > + > + /* Setup gadget structure */ > + udc->gadget.ops = &xusb_udc_ops; > + udc->gadget.max_speed = USB_SPEED_HIGH; > + udc->gadget.speed = USB_SPEED_UNKNOWN; > + udc->gadget.ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO].ep_usb; > + udc->gadget.name = driver_name; > + > + spin_lock_init(&udc->lock); > + > + /* Check for IP endianness */ > + udc->write_fn = xudc_write32_be; > + udc->read_fn = xudc_read32_be; > + udc->write_fn(udc->base_address, XUSB_TESTMODE_OFFSET, TEST_J); > + if ((udc->read_fn(udc->base_address + XUSB_TESTMODE_OFFSET)) > + != TEST_J) { > + udc->write_fn = xudc_write32; > + udc->read_fn = xudc_read32; > + } > + udc->write_fn(udc->base_address, XUSB_TESTMODE_OFFSET, 0); > + > + xudc_eps_init(udc); > + > + ep0 = &udc->ep[0]; > + /* Create a dummy request for GET_STATUS, SET_ADDRESS */ > + udc->req = container_of(xudc_ep_alloc_request(&ep0->ep_usb, GFP_KERNEL), > + struct xusb_req, usb_req); > + if (!udc->req) { > + ret = -ENOMEM; > + goto fail; > + } > + > + /* buffer for data of get_status request */ > + buff = kzalloc(2, GFP_KERNEL); > + if (buff == NULL) { > + ret = -ENOMEM; > + goto fail; > + } > + /* Dummy request ready, free this in remove */ > + udc->req->usb_req.buf = buff; > + > + /* Set device address to 0.*/ > + udc->write_fn(udc->base_address, XUSB_ADDRESS_OFFSET, 0); > + > + ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget); > + if (ret) > + goto fail; > + > + udc->dev = &udc->gadget.dev; > + > + /* Enable the interrupts.*/ > + ier = XUSB_STATUS_GLOBAL_INTR_MASK | XUSB_STATUS_INTR_EVENT_MASK | > + XUSB_STATUS_FIFO_BUFF_RDY_MASK | > + XUSB_STATUS_FIFO_BUFF_FREE_MASK | > + XUSB_STATUS_SETUP_PACKET_MASK | > + XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK; > + > + udc->write_fn(udc->base_address, XUSB_IER_OFFSET, ier); > + > + platform_set_drvdata(pdev, udc); > + > + dev_dbg(&pdev->dev, "%s at 0x%08X mapped to 0x%08X %s\n", > + driver_name, (u32)res->start, > + (u32 __force)udc->base_address, > + udc->dma_enabled ? "with DMA" : "without DMA"); > + > + return 0; > +fail: > + dev_err(&pdev->dev, "probe failed, %d\n", ret); > + return ret; > +} > + > +/** > + * xudc_remove - Releases the resources allocated during the initialization. > + * @pdev: pointer to the platform device structure. > + * > + * Return: 0 always > + */ > +static int xudc_remove(struct platform_device *pdev) > +{ > + struct xusb_udc *udc = platform_get_drvdata(pdev); > + void *buf = udc->req->usb_req.buf; > + > + usb_del_gadget_udc(&udc->gadget); > + > + /* free memory allocated for dummy request buffer */ > + kfree(buf); > + /* free memory allocated for dummy request */ > + kfree(udc->req); > + > + return 0; > +} > + > +/* Match table for of_platform binding */ > +static const struct of_device_id usb_of_match[] = { > + { .compatible = "xlnx,xps-usb2-device-4.00.a", }, > + { /* end of list */ }, > +}; > +MODULE_DEVICE_TABLE(of, usb_of_match); > + > +static struct platform_driver xudc_driver = { > + .driver = { > + .name = driver_name, > + .owner = THIS_MODULE, > + .of_match_table = usb_of_match, > + }, > + .probe = xudc_probe, > + .remove = xudc_remove, > +}; > + > +module_platform_driver(xudc_driver); > + > +MODULE_DESCRIPTION("Xilinx udc driver"); > +MODULE_AUTHOR("Xilinx, Inc"); > +MODULE_LICENSE("GPL"); > -- > 1.7.4 > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
