forked from Minki/linux
1fd4c45d6c
Pointer udc is assigned but never read, hence it is redundant and can be removed. Cleans up clang warning: drivers/usb/gadget/udc/udc-xilinx.c:974:2: warning: Value stored to 'udc' is never read Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2177 lines
58 KiB
C
2177 lines
58 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Xilinx USB peripheral controller driver
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*
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* Copyright (C) 2004 by Thomas Rathbone
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* Copyright (C) 2005 by HP Labs
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* Copyright (C) 2005 by David Brownell
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* Copyright (C) 2010 - 2014 Xilinx, Inc.
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*
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* Some parts of this driver code is based on the driver for at91-series
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* USB peripheral controller (at91_udc.c).
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_irq.h>
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#include <linux/prefetch.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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/* Register offsets for the USB device.*/
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#define XUSB_EP0_CONFIG_OFFSET 0x0000 /* EP0 Config Reg Offset */
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#define XUSB_SETUP_PKT_ADDR_OFFSET 0x0080 /* Setup Packet Address */
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#define XUSB_ADDRESS_OFFSET 0x0100 /* Address Register */
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#define XUSB_CONTROL_OFFSET 0x0104 /* Control Register */
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#define XUSB_STATUS_OFFSET 0x0108 /* Status Register */
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#define XUSB_FRAMENUM_OFFSET 0x010C /* Frame Number Register */
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#define XUSB_IER_OFFSET 0x0110 /* Interrupt Enable Register */
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#define XUSB_BUFFREADY_OFFSET 0x0114 /* Buffer Ready Register */
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#define XUSB_TESTMODE_OFFSET 0x0118 /* Test Mode Register */
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#define XUSB_DMA_RESET_OFFSET 0x0200 /* DMA Soft Reset Register */
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#define XUSB_DMA_CONTROL_OFFSET 0x0204 /* DMA Control Register */
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#define XUSB_DMA_DSAR_ADDR_OFFSET 0x0208 /* DMA source Address Reg */
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#define XUSB_DMA_DDAR_ADDR_OFFSET 0x020C /* DMA destination Addr Reg */
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#define XUSB_DMA_LENGTH_OFFSET 0x0210 /* DMA Length Register */
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#define XUSB_DMA_STATUS_OFFSET 0x0214 /* DMA Status Register */
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/* Endpoint Configuration Space offsets */
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#define XUSB_EP_CFGSTATUS_OFFSET 0x00 /* Endpoint Config Status */
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#define XUSB_EP_BUF0COUNT_OFFSET 0x08 /* Buffer 0 Count */
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#define XUSB_EP_BUF1COUNT_OFFSET 0x0C /* Buffer 1 Count */
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#define XUSB_CONTROL_USB_READY_MASK 0x80000000 /* USB ready Mask */
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#define XUSB_CONTROL_USB_RMTWAKE_MASK 0x40000000 /* Remote wake up mask */
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/* Interrupt register related masks.*/
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#define XUSB_STATUS_GLOBAL_INTR_MASK 0x80000000 /* Global Intr Enable */
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#define XUSB_STATUS_DMADONE_MASK 0x04000000 /* DMA done Mask */
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#define XUSB_STATUS_DMAERR_MASK 0x02000000 /* DMA Error Mask */
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#define XUSB_STATUS_DMABUSY_MASK 0x80000000 /* DMA Error Mask */
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#define XUSB_STATUS_RESUME_MASK 0x01000000 /* USB Resume Mask */
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#define XUSB_STATUS_RESET_MASK 0x00800000 /* USB Reset Mask */
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#define XUSB_STATUS_SUSPEND_MASK 0x00400000 /* USB Suspend Mask */
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#define XUSB_STATUS_DISCONNECT_MASK 0x00200000 /* USB Disconnect Mask */
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#define XUSB_STATUS_FIFO_BUFF_RDY_MASK 0x00100000 /* FIFO Buff Ready Mask */
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#define XUSB_STATUS_FIFO_BUFF_FREE_MASK 0x00080000 /* FIFO Buff Free Mask */
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#define XUSB_STATUS_SETUP_PACKET_MASK 0x00040000 /* Setup packet received */
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#define XUSB_STATUS_EP1_BUFF2_COMP_MASK 0x00000200 /* EP 1 Buff 2 Processed */
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#define XUSB_STATUS_EP1_BUFF1_COMP_MASK 0x00000002 /* EP 1 Buff 1 Processed */
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#define XUSB_STATUS_EP0_BUFF2_COMP_MASK 0x00000100 /* EP 0 Buff 2 Processed */
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#define XUSB_STATUS_EP0_BUFF1_COMP_MASK 0x00000001 /* EP 0 Buff 1 Processed */
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#define XUSB_STATUS_HIGH_SPEED_MASK 0x00010000 /* USB Speed Mask */
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/* Suspend,Reset,Suspend and Disconnect Mask */
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#define XUSB_STATUS_INTR_EVENT_MASK 0x01E00000
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/* Buffers completion Mask */
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#define XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK 0x0000FEFF
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/* Mask for buffer 0 and buffer 1 completion for all Endpoints */
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#define XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK 0x00000101
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#define XUSB_STATUS_EP_BUFF2_SHIFT 8 /* EP buffer offset */
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/* Endpoint Configuration Status Register */
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#define XUSB_EP_CFG_VALID_MASK 0x80000000 /* Endpoint Valid bit */
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#define XUSB_EP_CFG_STALL_MASK 0x40000000 /* Endpoint Stall bit */
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#define XUSB_EP_CFG_DATA_TOGGLE_MASK 0x08000000 /* Endpoint Data toggle */
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/* USB device specific global configuration constants.*/
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#define XUSB_MAX_ENDPOINTS 8 /* Maximum End Points */
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#define XUSB_EP_NUMBER_ZERO 0 /* End point Zero */
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/* DPRAM is the source address for DMA transfer */
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#define XUSB_DMA_READ_FROM_DPRAM 0x80000000
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#define XUSB_DMA_DMASR_BUSY 0x80000000 /* DMA busy */
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#define XUSB_DMA_DMASR_ERROR 0x40000000 /* DMA Error */
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/*
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* When this bit is set, the DMA buffer ready bit is set by hardware upon
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* DMA transfer completion.
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*/
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#define XUSB_DMA_BRR_CTRL 0x40000000 /* DMA bufready ctrl bit */
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/* Phase States */
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#define SETUP_PHASE 0x0000 /* Setup Phase */
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#define DATA_PHASE 0x0001 /* Data Phase */
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#define STATUS_PHASE 0x0002 /* Status Phase */
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#define EP0_MAX_PACKET 64 /* Endpoint 0 maximum packet length */
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#define STATUSBUFF_SIZE 2 /* Buffer size for GET_STATUS command */
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#define EPNAME_SIZE 4 /* Buffer size for endpoint name */
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/* container_of helper macros */
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#define to_udc(g) container_of((g), struct xusb_udc, gadget)
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#define to_xusb_ep(ep) container_of((ep), struct xusb_ep, ep_usb)
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#define to_xusb_req(req) container_of((req), struct xusb_req, usb_req)
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/**
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* struct xusb_req - Xilinx USB device request structure
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* @usb_req: Linux usb request structure
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* @queue: usb device request queue
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* @ep: pointer to xusb_endpoint structure
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*/
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struct xusb_req {
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struct usb_request usb_req;
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struct list_head queue;
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struct xusb_ep *ep;
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};
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/**
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* struct xusb_ep - USB end point structure.
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* @ep_usb: usb endpoint instance
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* @queue: endpoint message queue
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* @udc: xilinx usb peripheral driver instance pointer
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* @desc: pointer to the usb endpoint descriptor
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* @rambase: the endpoint buffer address
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* @offset: the endpoint register offset value
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* @name: name of the endpoint
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* @epnumber: endpoint number
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* @maxpacket: maximum packet size the endpoint can store
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* @buffer0count: the size of the packet recieved in the first buffer
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* @buffer1count: the size of the packet received in the second buffer
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* @curbufnum: current buffer of endpoint that will be processed next
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* @buffer0ready: the busy state of first buffer
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* @buffer1ready: the busy state of second buffer
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* @is_in: endpoint direction (IN or OUT)
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* @is_iso: endpoint type(isochronous or non isochronous)
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*/
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struct xusb_ep {
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struct usb_ep ep_usb;
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struct list_head queue;
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struct xusb_udc *udc;
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const struct usb_endpoint_descriptor *desc;
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u32 rambase;
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u32 offset;
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char name[4];
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u16 epnumber;
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u16 maxpacket;
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u16 buffer0count;
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u16 buffer1count;
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u8 curbufnum;
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bool buffer0ready;
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bool buffer1ready;
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bool is_in;
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bool is_iso;
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};
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/**
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* struct xusb_udc - USB peripheral driver structure
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* @gadget: USB gadget driver instance
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* @ep: an array of endpoint structures
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* @driver: pointer to the usb gadget driver instance
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* @setup: usb_ctrlrequest structure for control requests
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* @req: pointer to dummy request for get status command
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* @dev: pointer to device structure in gadget
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* @usb_state: device in suspended state or not
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* @remote_wkp: remote wakeup enabled by host
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* @setupseqtx: tx status
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* @setupseqrx: rx status
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* @addr: the usb device base address
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* @lock: instance of spinlock
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* @dma_enabled: flag indicating whether the dma is included in the system
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* @read_fn: function pointer to read device registers
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* @write_fn: function pointer to write to device registers
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*/
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struct xusb_udc {
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struct usb_gadget gadget;
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struct xusb_ep ep[8];
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struct usb_gadget_driver *driver;
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struct usb_ctrlrequest setup;
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struct xusb_req *req;
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struct device *dev;
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u32 usb_state;
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u32 remote_wkp;
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u32 setupseqtx;
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u32 setupseqrx;
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void __iomem *addr;
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spinlock_t lock;
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bool dma_enabled;
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unsigned int (*read_fn)(void __iomem *);
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void (*write_fn)(void __iomem *, u32, u32);
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};
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/* Endpoint buffer start addresses in the core */
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static u32 rambase[8] = { 0x22, 0x1000, 0x1100, 0x1200, 0x1300, 0x1400, 0x1500,
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0x1600 };
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static const char driver_name[] = "xilinx-udc";
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static const char ep0name[] = "ep0";
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/* Control endpoint configuration.*/
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static const struct usb_endpoint_descriptor config_bulk_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(EP0_MAX_PACKET),
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};
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/**
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* xudc_write32 - little endian write to device registers
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* @addr: base addr of device registers
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* @offset: register offset
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* @val: data to be written
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*/
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static void xudc_write32(void __iomem *addr, u32 offset, u32 val)
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{
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iowrite32(val, addr + offset);
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}
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/**
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* xudc_read32 - little endian read from device registers
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* @addr: addr of device register
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* Return: value at addr
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*/
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static unsigned int xudc_read32(void __iomem *addr)
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{
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return ioread32(addr);
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}
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/**
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* xudc_write32_be - big endian write to device registers
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* @addr: base addr of device registers
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* @offset: register offset
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* @val: data to be written
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*/
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static void xudc_write32_be(void __iomem *addr, u32 offset, u32 val)
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{
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iowrite32be(val, addr + offset);
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}
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/**
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* xudc_read32_be - big endian read from device registers
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* @addr: addr of device register
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* Return: value at addr
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*/
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static unsigned int xudc_read32_be(void __iomem *addr)
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{
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return ioread32be(addr);
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}
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/**
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* xudc_wrstatus - Sets up the usb device status stages.
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* @udc: pointer to the usb device controller structure.
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*/
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static void xudc_wrstatus(struct xusb_udc *udc)
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{
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struct xusb_ep *ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO];
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u32 epcfgreg;
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epcfgreg = udc->read_fn(udc->addr + ep0->offset)|
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XUSB_EP_CFG_DATA_TOGGLE_MASK;
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udc->write_fn(udc->addr, ep0->offset, epcfgreg);
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udc->write_fn(udc->addr, ep0->offset + XUSB_EP_BUF0COUNT_OFFSET, 0);
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udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
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}
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/**
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* xudc_epconfig - Configures the given endpoint.
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* @ep: pointer to the usb device endpoint structure.
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* @udc: pointer to the usb peripheral controller structure.
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*
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* This function configures a specific endpoint with the given configuration
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* data.
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*/
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static void xudc_epconfig(struct xusb_ep *ep, struct xusb_udc *udc)
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{
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u32 epcfgreg;
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/*
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* Configure the end point direction, type, Max Packet Size and the
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* EP buffer location.
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*/
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epcfgreg = ((ep->is_in << 29) | (ep->is_iso << 28) |
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(ep->ep_usb.maxpacket << 15) | (ep->rambase));
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udc->write_fn(udc->addr, ep->offset, epcfgreg);
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/* Set the Buffer count and the Buffer ready bits.*/
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udc->write_fn(udc->addr, ep->offset + XUSB_EP_BUF0COUNT_OFFSET,
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ep->buffer0count);
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udc->write_fn(udc->addr, ep->offset + XUSB_EP_BUF1COUNT_OFFSET,
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ep->buffer1count);
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if (ep->buffer0ready)
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udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
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1 << ep->epnumber);
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if (ep->buffer1ready)
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udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
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1 << (ep->epnumber + XUSB_STATUS_EP_BUFF2_SHIFT));
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}
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/**
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* xudc_start_dma - Starts DMA transfer.
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* @ep: pointer to the usb device endpoint structure.
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* @src: DMA source address.
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* @dst: DMA destination address.
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* @length: number of bytes to transfer.
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*
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* Return: 0 on success, error code on failure
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*
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* This function starts DMA transfer by writing to DMA source,
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* destination and lenth registers.
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*/
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static int xudc_start_dma(struct xusb_ep *ep, dma_addr_t src,
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dma_addr_t dst, u32 length)
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{
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struct xusb_udc *udc = ep->udc;
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int rc = 0;
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u32 timeout = 500;
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u32 reg;
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/*
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* Set the addresses in the DMA source and
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* destination registers and then set the length
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* into the DMA length register.
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*/
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udc->write_fn(udc->addr, XUSB_DMA_DSAR_ADDR_OFFSET, src);
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udc->write_fn(udc->addr, XUSB_DMA_DDAR_ADDR_OFFSET, dst);
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udc->write_fn(udc->addr, XUSB_DMA_LENGTH_OFFSET, length);
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/*
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* Wait till DMA transaction is complete and
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* check whether the DMA transaction was
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* successful.
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*/
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do {
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reg = udc->read_fn(udc->addr + XUSB_DMA_STATUS_OFFSET);
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if (!(reg & XUSB_DMA_DMASR_BUSY))
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break;
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/*
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* We can't sleep here, because it's also called from
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* interrupt context.
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*/
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timeout--;
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if (!timeout) {
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dev_err(udc->dev, "DMA timeout\n");
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return -ETIMEDOUT;
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}
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udelay(1);
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} while (1);
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if ((udc->read_fn(udc->addr + XUSB_DMA_STATUS_OFFSET) &
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XUSB_DMA_DMASR_ERROR) == XUSB_DMA_DMASR_ERROR){
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dev_err(udc->dev, "DMA Error\n");
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rc = -EINVAL;
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}
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return rc;
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}
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/**
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* xudc_dma_send - Sends IN data using DMA.
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* @ep: pointer to the usb device endpoint structure.
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* @req: pointer to the usb request structure.
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* @buffer: pointer to data to be sent.
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* @length: number of bytes to send.
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*
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* Return: 0 on success, -EAGAIN if no buffer is free and error
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* code on failure.
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*
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* This function sends data using DMA.
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*/
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static int xudc_dma_send(struct xusb_ep *ep, struct xusb_req *req,
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u8 *buffer, u32 length)
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{
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u32 *eprambase;
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dma_addr_t src;
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dma_addr_t dst;
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struct xusb_udc *udc = ep->udc;
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src = req->usb_req.dma + req->usb_req.actual;
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if (req->usb_req.length)
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dma_sync_single_for_device(udc->dev, src,
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length, DMA_TO_DEVICE);
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if (!ep->curbufnum && !ep->buffer0ready) {
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/* Get the Buffer address and copy the transmit data.*/
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eprambase = (u32 __force *)(udc->addr + ep->rambase);
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dst = virt_to_phys(eprambase);
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udc->write_fn(udc->addr, ep->offset +
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XUSB_EP_BUF0COUNT_OFFSET, length);
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udc->write_fn(udc->addr, XUSB_DMA_CONTROL_OFFSET,
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XUSB_DMA_BRR_CTRL | (1 << ep->epnumber));
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ep->buffer0ready = 1;
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ep->curbufnum = 1;
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} else if (ep->curbufnum && !ep->buffer1ready) {
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/* Get the Buffer address and copy the transmit data.*/
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eprambase = (u32 __force *)(udc->addr + ep->rambase +
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ep->ep_usb.maxpacket);
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dst = virt_to_phys(eprambase);
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udc->write_fn(udc->addr, ep->offset +
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XUSB_EP_BUF1COUNT_OFFSET, length);
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udc->write_fn(udc->addr, XUSB_DMA_CONTROL_OFFSET,
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XUSB_DMA_BRR_CTRL | (1 << (ep->epnumber +
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XUSB_STATUS_EP_BUFF2_SHIFT)));
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ep->buffer1ready = 1;
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ep->curbufnum = 0;
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} else {
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/* None of ping pong buffers are ready currently .*/
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return -EAGAIN;
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}
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return xudc_start_dma(ep, src, dst, length);
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}
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/**
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* xudc_dma_receive - Receives OUT data using DMA.
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* @ep: pointer to the usb device endpoint structure.
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* @req: pointer to the usb request structure.
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* @buffer: pointer to storage buffer of received data.
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* @length: number of bytes to receive.
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*
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* Return: 0 on success, -EAGAIN if no buffer is free and error
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* code on failure.
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*
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* This function receives data using DMA.
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*/
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static int xudc_dma_receive(struct xusb_ep *ep, struct xusb_req *req,
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u8 *buffer, u32 length)
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{
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u32 *eprambase;
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dma_addr_t src;
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dma_addr_t dst;
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struct xusb_udc *udc = ep->udc;
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dst = req->usb_req.dma + req->usb_req.actual;
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if (!ep->curbufnum && !ep->buffer0ready) {
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/* Get the Buffer address and copy the transmit data */
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eprambase = (u32 __force *)(udc->addr + ep->rambase);
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src = virt_to_phys(eprambase);
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udc->write_fn(udc->addr, 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 *)(udc->addr +
|
|
ep->rambase + ep->ep_usb.maxpacket);
|
|
src = virt_to_phys(eprambase);
|
|
udc->write_fn(udc->addr, 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;
|
|
}
|
|
|
|
return xudc_start_dma(ep, src, dst, length);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
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->addr + ep->rambase);
|
|
if (ep->is_in) {
|
|
memcpy(eprambase, bufferptr, bytestosend);
|
|
udc->write_fn(udc->addr, ep->offset +
|
|
XUSB_EP_BUF0COUNT_OFFSET, bufferlen);
|
|
} else {
|
|
memcpy(bufferptr, eprambase, bytestosend);
|
|
}
|
|
/*
|
|
* Enable the buffer for transmission.
|
|
*/
|
|
udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
|
|
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 *)(udc->addr + ep->rambase +
|
|
ep->ep_usb.maxpacket);
|
|
if (ep->is_in) {
|
|
memcpy(eprambase, bufferptr, bytestosend);
|
|
udc->write_fn(udc->addr, ep->offset +
|
|
XUSB_EP_BUF1COUNT_OFFSET, bufferlen);
|
|
} else {
|
|
memcpy(bufferptr, eprambase, bytestosend);
|
|
}
|
|
/*
|
|
* Enable the buffer for transmission.
|
|
*/
|
|
udc->write_fn(udc->addr, 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 && ep->buffer1ready) {
|
|
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->addr + 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 || ep->buffer1ready) {
|
|
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->addr + ep->offset);
|
|
epcfgreg |= XUSB_EP_CFG_STALL_MASK;
|
|
udc->write_fn(udc->addr, ep->offset, epcfgreg);
|
|
} else {
|
|
/* Unstall the device.*/
|
|
epcfgreg = udc->read_fn(udc->addr + ep->offset);
|
|
epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
|
|
udc->write_fn(udc->addr, ep->offset, epcfgreg);
|
|
if (ep->epnumber) {
|
|
/* Reset the toggle bit.*/
|
|
epcfgreg = udc->read_fn(ep->udc->addr + ep->offset);
|
|
epcfgreg &= ~XUSB_EP_CFG_DATA_TOGGLE_MASK;
|
|
udc->write_fn(udc->addr, 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;
|
|
u32 epcfg;
|
|
u32 ier;
|
|
u16 maxpacket;
|
|
|
|
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 = maxpacket = le16_to_cpu(desc->wMaxPacketSize);
|
|
|
|
switch (tmp) {
|
|
case USB_ENDPOINT_XFER_CONTROL:
|
|
dev_dbg(udc->dev, "only one control endpoint\n");
|
|
/* NON- ISO */
|
|
ep->is_iso = 0;
|
|
return -EINVAL;
|
|
case USB_ENDPOINT_XFER_INT:
|
|
/* NON- ISO */
|
|
ep->is_iso = 0;
|
|
if (maxpacket > 64) {
|
|
dev_dbg(udc->dev, "bogus maxpacket %d\n", maxpacket);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
/* NON- ISO */
|
|
ep->is_iso = 0;
|
|
if (!(is_power_of_2(maxpacket) && maxpacket >= 8 &&
|
|
maxpacket <= 512)) {
|
|
dev_dbg(udc->dev, "bogus maxpacket %d\n", maxpacket);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case USB_ENDPOINT_XFER_ISOC:
|
|
/* ISO */
|
|
ep->is_iso = 1;
|
|
break;
|
|
}
|
|
|
|
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, maxpacket);
|
|
|
|
/* Enable the End point.*/
|
|
epcfg = udc->read_fn(udc->addr + ep->offset);
|
|
epcfg |= XUSB_EP_CFG_VALID_MASK;
|
|
udc->write_fn(udc->addr, ep->offset, epcfg);
|
|
if (ep->epnumber)
|
|
ep->rambase <<= 2;
|
|
|
|
/* Enable buffer completion interrupts for endpoint */
|
|
ier = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
|
|
ier |= (XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK << ep->epnumber);
|
|
udc->write_fn(udc->addr, XUSB_IER_OFFSET, ier);
|
|
|
|
/* for OUT endpoint set buffers ready to receive */
|
|
if (ep->epnumber && !ep->is_in) {
|
|
udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
|
|
1 << ep->epnumber);
|
|
ep->buffer0ready = 1;
|
|
udc->write_fn(udc->addr, 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->addr + ep->offset);
|
|
epcfg &= ~XUSB_EP_CFG_VALID_MASK;
|
|
udc->write_fn(udc->addr, 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_req *req;
|
|
|
|
req = kzalloc(sizeof(*req), gfp_flags);
|
|
if (!req)
|
|
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->addr);
|
|
length = req->usb_req.actual = min_t(u32, length,
|
|
EP0_MAX_PACKET);
|
|
memcpy(corebuf, req->usb_req.buf, length);
|
|
udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, length);
|
|
udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
|
|
} else {
|
|
if (udc->setup.wLength) {
|
|
/* Enable EP0 buffer to receive data */
|
|
udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, 0);
|
|
udc->write_fn(udc->addr, 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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
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(&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->addr + 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->addr + XUSB_CONTROL_OFFSET);
|
|
crtlreg |= XUSB_CONTROL_USB_RMTWAKE_MASK;
|
|
/* set remote wake up bit */
|
|
udc->write_fn(udc->addr, 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->addr, 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->addr + XUSB_CONTROL_OFFSET);
|
|
if (is_on)
|
|
crtlreg |= XUSB_CONTROL_USB_READY_MASK;
|
|
else
|
|
crtlreg &= ~XUSB_CONTROL_USB_READY_MASK;
|
|
|
|
udc->write_fn(udc->addr, 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;
|
|
|
|
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);
|
|
snprintf(ep->name, EPNAME_SIZE, "ep%d", ep_number);
|
|
ep->ep_usb.name = ep->name;
|
|
ep->ep_usb.ops = &xusb_ep_ops;
|
|
|
|
ep->ep_usb.caps.type_iso = true;
|
|
ep->ep_usb.caps.type_bulk = true;
|
|
ep->ep_usb.caps.type_int = true;
|
|
} else {
|
|
ep->ep_usb.name = ep0name;
|
|
usb_ep_set_maxpacket_limit(&ep->ep_usb, EP0_MAX_PACKET);
|
|
ep->ep_usb.ops = &xusb_ep0_ops;
|
|
|
|
ep->ep_usb.caps.type_control = true;
|
|
}
|
|
|
|
ep->ep_usb.caps.dir_in = true;
|
|
ep->ep_usb.caps.dir_out = true;
|
|
|
|
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->addr, 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 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->addr, 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->addr + ep->offset);
|
|
epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
|
|
udc->write_fn(udc->addr, ep->offset, epcfgreg);
|
|
if (ep->epnumber) {
|
|
/* Reset the toggle bit.*/
|
|
epcfgreg = udc->read_fn(udc->addr + ep->offset);
|
|
epcfgreg &= ~XUSB_EP_CFG_DATA_TOGGLE_MASK;
|
|
udc->write_fn(udc->addr, 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->addr, XUSB_TESTMODE_OFFSET, 0);
|
|
|
|
/* Set device address and remote wakeup to 0 */
|
|
udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
|
|
udc->remote_wkp = 0;
|
|
|
|
/* Enable the suspend, resume and disconnect */
|
|
intrreg = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
|
|
intrreg |= XUSB_STATUS_SUSPEND_MASK | XUSB_STATUS_RESUME_MASK |
|
|
XUSB_STATUS_DISCONNECT_MASK;
|
|
udc->write_fn(udc->addr, 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->addr + XUSB_IER_OFFSET);
|
|
intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_RESUME_MASK |
|
|
XUSB_STATUS_DISCONNECT_MASK;
|
|
udc->write_fn(udc->addr, 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->addr + XUSB_IER_OFFSET);
|
|
intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_SUSPEND_MASK |
|
|
XUSB_STATUS_DISCONNECT_MASK;
|
|
udc->write_fn(udc->addr, 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->addr + XUSB_IER_OFFSET);
|
|
intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_RESUME_MASK |
|
|
XUSB_STATUS_SUSPEND_MASK;
|
|
udc->write_fn(udc->addr, 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->addr + ep0->offset);
|
|
epcfgreg |= XUSB_EP_CFG_STALL_MASK;
|
|
udc->write_fn(udc->addr, 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);
|
|
}
|
|
|
|
/**
|
|
* 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->addr + 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);
|
|
}
|
|
|
|
/**
|
|
* 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->addr + target_ep->offset);
|
|
if (!endpoint) {
|
|
/* Clear the stall.*/
|
|
epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
|
|
udc->write_fn(udc->addr,
|
|
target_ep->offset, epcfgreg);
|
|
} else {
|
|
if (flag) {
|
|
epcfgreg |= XUSB_EP_CFG_STALL_MASK;
|
|
udc->write_fn(udc->addr,
|
|
target_ep->offset,
|
|
epcfgreg);
|
|
} else {
|
|
/* Unstall the endpoint.*/
|
|
epcfgreg &= ~(XUSB_EP_CFG_STALL_MASK |
|
|
XUSB_EP_CFG_DATA_TOGGLE_MASK);
|
|
udc->write_fn(udc->addr,
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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->addr + XUSB_SETUP_PKT_ADDR_OFFSET);
|
|
memcpy(&setup, 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->addr +
|
|
XUSB_EP_BUF0COUNT_OFFSET);
|
|
/* Copy the data to be received from the DPRAM. */
|
|
ep0rambase = (u8 __force *) (udc->addr +
|
|
(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, 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->addr, XUSB_EP_BUF0COUNT_OFFSET, 0);
|
|
udc->write_fn(udc->addr, 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->addr, 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->addr,
|
|
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->addr + ep0->offset);
|
|
epcfgreg |= XUSB_EP_CFG_DATA_TOGGLE_MASK;
|
|
udc->write_fn(udc->addr, 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->addr +
|
|
(ep0->rambase << 2));
|
|
buffer = req->usb_req.buf + req->usb_req.actual;
|
|
req->usb_req.actual = req->usb_req.actual + length;
|
|
memcpy(ep0rambase, buffer, length);
|
|
}
|
|
udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, count);
|
|
udc->write_fn(udc->addr, 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->addr + XUSB_IER_OFFSET);
|
|
ier &= ~XUSB_STATUS_INTR_EVENT_MASK;
|
|
udc->write_fn(udc->addr, XUSB_IER_OFFSET, ier);
|
|
|
|
/* Read the Interrupt Status Register.*/
|
|
intrstatus = udc->read_fn(udc->addr + 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->addr + XUSB_IER_OFFSET);
|
|
ier |= XUSB_STATUS_INTR_EVENT_MASK;
|
|
udc->write_fn(udc->addr, 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;
|
|
int irq;
|
|
int ret;
|
|
u32 ier;
|
|
u8 *buff;
|
|
|
|
udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
|
|
if (!udc)
|
|
return -ENOMEM;
|
|
|
|
/* Create a dummy request for GET_STATUS, SET_ADDRESS */
|
|
udc->req = devm_kzalloc(&pdev->dev, sizeof(struct xusb_req),
|
|
GFP_KERNEL);
|
|
if (!udc->req)
|
|
return -ENOMEM;
|
|
|
|
buff = devm_kzalloc(&pdev->dev, STATUSBUFF_SIZE, GFP_KERNEL);
|
|
if (!buff)
|
|
return -ENOMEM;
|
|
|
|
udc->req->usb_req.buf = buff;
|
|
|
|
/* Map the registers */
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
udc->addr = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(udc->addr))
|
|
return PTR_ERR(udc->addr);
|
|
|
|
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->addr, XUSB_TESTMODE_OFFSET, TEST_J);
|
|
if ((udc->read_fn(udc->addr + XUSB_TESTMODE_OFFSET))
|
|
!= TEST_J) {
|
|
udc->write_fn = xudc_write32;
|
|
udc->read_fn = xudc_read32;
|
|
}
|
|
udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, 0);
|
|
|
|
xudc_eps_init(udc);
|
|
|
|
/* Set device address to 0.*/
|
|
udc->write_fn(udc->addr, 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->addr, XUSB_IER_OFFSET, ier);
|
|
|
|
platform_set_drvdata(pdev, udc);
|
|
|
|
dev_vdbg(&pdev->dev, "%s at 0x%08X mapped to %p %s\n",
|
|
driver_name, (u32)res->start, udc->addr,
|
|
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);
|
|
|
|
usb_del_gadget_udc(&udc->gadget);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Match table for of_platform binding */
|
|
static const struct of_device_id usb_of_match[] = {
|
|
{ .compatible = "xlnx,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,
|
|
.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");
|