2260 lines
51 KiB
C
2260 lines
51 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2020 Xillybus Ltd, http://xillybus.com
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*
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* Driver for the XillyUSB FPGA/host framework.
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*
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* This driver interfaces with a special IP core in an FPGA, setting up
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* a pipe between a hardware FIFO in the programmable logic and a device
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* file in the host. The number of such pipes and their attributes are
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* set up on the logic. This driver detects these automatically and
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* creates the device files accordingly.
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <asm/byteorder.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/crc32.h>
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#include <linux/poll.h>
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#include <linux/delay.h>
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#include <linux/usb.h>
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#include "xillybus_class.h"
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MODULE_DESCRIPTION("Driver for XillyUSB FPGA IP Core");
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MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
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MODULE_ALIAS("xillyusb");
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MODULE_LICENSE("GPL v2");
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#define XILLY_RX_TIMEOUT (10 * HZ / 1000)
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#define XILLY_RESPONSE_TIMEOUT (500 * HZ / 1000)
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#define BUF_SIZE_ORDER 4
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#define BUFNUM 8
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#define LOG2_IDT_FIFO_SIZE 16
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#define LOG2_INITIAL_FIFO_BUF_SIZE 16
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#define MSG_EP_NUM 1
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#define IN_EP_NUM 1
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static const char xillyname[] = "xillyusb";
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static unsigned int fifo_buf_order;
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#define USB_VENDOR_ID_XILINX 0x03fd
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#define USB_VENDOR_ID_ALTERA 0x09fb
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#define USB_PRODUCT_ID_XILLYUSB 0xebbe
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static const struct usb_device_id xillyusb_table[] = {
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{ USB_DEVICE(USB_VENDOR_ID_XILINX, USB_PRODUCT_ID_XILLYUSB) },
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{ USB_DEVICE(USB_VENDOR_ID_ALTERA, USB_PRODUCT_ID_XILLYUSB) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, xillyusb_table);
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struct xillyusb_dev;
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struct xillyfifo {
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unsigned int bufsize; /* In bytes, always a power of 2 */
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unsigned int bufnum;
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unsigned int size; /* Lazy: Equals bufsize * bufnum */
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unsigned int buf_order;
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int fill; /* Number of bytes in the FIFO */
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spinlock_t lock;
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wait_queue_head_t waitq;
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unsigned int readpos;
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unsigned int readbuf;
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unsigned int writepos;
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unsigned int writebuf;
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char **mem;
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};
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struct xillyusb_channel;
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struct xillyusb_endpoint {
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struct xillyusb_dev *xdev;
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struct mutex ep_mutex; /* serialize operations on endpoint */
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struct list_head buffers;
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struct list_head filled_buffers;
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spinlock_t buffers_lock; /* protect these two lists */
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unsigned int order;
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unsigned int buffer_size;
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unsigned int fill_mask;
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int outstanding_urbs;
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struct usb_anchor anchor;
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struct xillyfifo fifo;
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struct work_struct workitem;
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bool shutting_down;
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bool drained;
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bool wake_on_drain;
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u8 ep_num;
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};
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struct xillyusb_channel {
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struct xillyusb_dev *xdev;
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struct xillyfifo *in_fifo;
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struct xillyusb_endpoint *out_ep;
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struct mutex lock; /* protect @out_ep, @in_fifo, bit fields below */
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struct mutex in_mutex; /* serialize fops on FPGA to host stream */
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struct mutex out_mutex; /* serialize fops on host to FPGA stream */
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wait_queue_head_t flushq;
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int chan_idx;
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u32 in_consumed_bytes;
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u32 in_current_checkpoint;
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u32 out_bytes;
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unsigned int in_log2_element_size;
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unsigned int out_log2_element_size;
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unsigned int in_log2_fifo_size;
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unsigned int out_log2_fifo_size;
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unsigned int read_data_ok; /* EOF not arrived (yet) */
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unsigned int poll_used;
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unsigned int flushing;
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unsigned int flushed;
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unsigned int canceled;
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/* Bit fields protected by @lock except for initialization */
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unsigned readable:1;
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unsigned writable:1;
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unsigned open_for_read:1;
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unsigned open_for_write:1;
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unsigned in_synchronous:1;
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unsigned out_synchronous:1;
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unsigned in_seekable:1;
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unsigned out_seekable:1;
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};
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struct xillybuffer {
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struct list_head entry;
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struct xillyusb_endpoint *ep;
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void *buf;
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unsigned int len;
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};
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struct xillyusb_dev {
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struct xillyusb_channel *channels;
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struct usb_device *udev;
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struct device *dev; /* For dev_err() and such */
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struct kref kref;
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struct workqueue_struct *workq;
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int error;
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spinlock_t error_lock; /* protect @error */
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struct work_struct wakeup_workitem;
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int num_channels;
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struct xillyusb_endpoint *msg_ep;
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struct xillyusb_endpoint *in_ep;
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struct mutex msg_mutex; /* serialize opcode transmission */
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int in_bytes_left;
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int leftover_chan_num;
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unsigned int in_counter;
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struct mutex process_in_mutex; /* synchronize wakeup_all() */
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};
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/* FPGA to host opcodes */
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enum {
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OPCODE_DATA = 0,
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OPCODE_QUIESCE_ACK = 1,
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OPCODE_EOF = 2,
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OPCODE_REACHED_CHECKPOINT = 3,
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OPCODE_CANCELED_CHECKPOINT = 4,
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};
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/* Host to FPGA opcodes */
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enum {
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OPCODE_QUIESCE = 0,
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OPCODE_REQ_IDT = 1,
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OPCODE_SET_CHECKPOINT = 2,
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OPCODE_CLOSE = 3,
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OPCODE_SET_PUSH = 4,
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OPCODE_UPDATE_PUSH = 5,
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OPCODE_CANCEL_CHECKPOINT = 6,
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OPCODE_SET_ADDR = 7,
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};
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/*
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* fifo_write() and fifo_read() are NOT reentrant (i.e. concurrent multiple
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* calls to each on the same FIFO is not allowed) however it's OK to have
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* threads calling each of the two functions once on the same FIFO, and
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* at the same time.
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*/
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static int fifo_write(struct xillyfifo *fifo,
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const void *data, unsigned int len,
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int (*copier)(void *, const void *, int))
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{
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unsigned int done = 0;
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unsigned int todo = len;
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unsigned int nmax;
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unsigned int writepos = fifo->writepos;
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unsigned int writebuf = fifo->writebuf;
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unsigned long flags;
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int rc;
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nmax = fifo->size - READ_ONCE(fifo->fill);
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while (1) {
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unsigned int nrail = fifo->bufsize - writepos;
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unsigned int n = min(todo, nmax);
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if (n == 0) {
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spin_lock_irqsave(&fifo->lock, flags);
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fifo->fill += done;
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spin_unlock_irqrestore(&fifo->lock, flags);
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fifo->writepos = writepos;
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fifo->writebuf = writebuf;
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return done;
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}
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if (n > nrail)
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n = nrail;
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rc = (*copier)(fifo->mem[writebuf] + writepos, data + done, n);
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if (rc)
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return rc;
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done += n;
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todo -= n;
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writepos += n;
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nmax -= n;
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if (writepos == fifo->bufsize) {
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writepos = 0;
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writebuf++;
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if (writebuf == fifo->bufnum)
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writebuf = 0;
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}
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}
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}
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static int fifo_read(struct xillyfifo *fifo,
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void *data, unsigned int len,
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int (*copier)(void *, const void *, int))
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{
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unsigned int done = 0;
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unsigned int todo = len;
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unsigned int fill;
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unsigned int readpos = fifo->readpos;
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unsigned int readbuf = fifo->readbuf;
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unsigned long flags;
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int rc;
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/*
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* The spinlock here is necessary, because otherwise fifo->fill
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* could have been increased by fifo_write() after writing data
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* to the buffer, but this data would potentially not have been
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* visible on this thread at the time the updated fifo->fill was.
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* That could lead to reading invalid data.
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*/
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spin_lock_irqsave(&fifo->lock, flags);
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fill = fifo->fill;
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spin_unlock_irqrestore(&fifo->lock, flags);
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while (1) {
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unsigned int nrail = fifo->bufsize - readpos;
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unsigned int n = min(todo, fill);
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if (n == 0) {
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spin_lock_irqsave(&fifo->lock, flags);
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fifo->fill -= done;
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spin_unlock_irqrestore(&fifo->lock, flags);
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fifo->readpos = readpos;
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fifo->readbuf = readbuf;
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return done;
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}
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if (n > nrail)
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n = nrail;
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rc = (*copier)(data + done, fifo->mem[readbuf] + readpos, n);
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if (rc)
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return rc;
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done += n;
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todo -= n;
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readpos += n;
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fill -= n;
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if (readpos == fifo->bufsize) {
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readpos = 0;
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readbuf++;
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if (readbuf == fifo->bufnum)
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readbuf = 0;
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}
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}
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}
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/*
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* These three wrapper functions are used as the @copier argument to
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* fifo_write() and fifo_read(), so that they can work directly with
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* user memory as well.
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*/
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static int xilly_copy_from_user(void *dst, const void *src, int n)
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{
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if (copy_from_user(dst, (const void __user *)src, n))
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return -EFAULT;
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return 0;
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}
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static int xilly_copy_to_user(void *dst, const void *src, int n)
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{
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if (copy_to_user((void __user *)dst, src, n))
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return -EFAULT;
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return 0;
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}
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static int xilly_memcpy(void *dst, const void *src, int n)
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{
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memcpy(dst, src, n);
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return 0;
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}
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static int fifo_init(struct xillyfifo *fifo,
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unsigned int log2_size)
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{
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unsigned int log2_bufnum;
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unsigned int buf_order;
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int i;
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unsigned int log2_fifo_buf_size;
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retry:
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log2_fifo_buf_size = fifo_buf_order + PAGE_SHIFT;
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if (log2_size > log2_fifo_buf_size) {
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log2_bufnum = log2_size - log2_fifo_buf_size;
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buf_order = fifo_buf_order;
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fifo->bufsize = 1 << log2_fifo_buf_size;
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} else {
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log2_bufnum = 0;
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buf_order = (log2_size > PAGE_SHIFT) ?
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log2_size - PAGE_SHIFT : 0;
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fifo->bufsize = 1 << log2_size;
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}
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fifo->bufnum = 1 << log2_bufnum;
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fifo->size = fifo->bufnum * fifo->bufsize;
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fifo->buf_order = buf_order;
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fifo->mem = kmalloc_array(fifo->bufnum, sizeof(void *), GFP_KERNEL);
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if (!fifo->mem)
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return -ENOMEM;
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for (i = 0; i < fifo->bufnum; i++) {
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fifo->mem[i] = (void *)
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__get_free_pages(GFP_KERNEL, buf_order);
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if (!fifo->mem[i])
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goto memfail;
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}
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fifo->fill = 0;
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fifo->readpos = 0;
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fifo->readbuf = 0;
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fifo->writepos = 0;
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fifo->writebuf = 0;
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spin_lock_init(&fifo->lock);
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init_waitqueue_head(&fifo->waitq);
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return 0;
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memfail:
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for (i--; i >= 0; i--)
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free_pages((unsigned long)fifo->mem[i], buf_order);
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kfree(fifo->mem);
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fifo->mem = NULL;
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if (fifo_buf_order) {
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fifo_buf_order--;
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goto retry;
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} else {
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return -ENOMEM;
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}
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}
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static void fifo_mem_release(struct xillyfifo *fifo)
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{
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int i;
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if (!fifo->mem)
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return;
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for (i = 0; i < fifo->bufnum; i++)
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free_pages((unsigned long)fifo->mem[i], fifo->buf_order);
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kfree(fifo->mem);
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}
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/*
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* When endpoint_quiesce() returns, the endpoint has no URBs submitted,
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* won't accept any new URB submissions, and its related work item doesn't
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* and won't run anymore.
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*/
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static void endpoint_quiesce(struct xillyusb_endpoint *ep)
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{
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mutex_lock(&ep->ep_mutex);
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ep->shutting_down = true;
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mutex_unlock(&ep->ep_mutex);
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usb_kill_anchored_urbs(&ep->anchor);
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cancel_work_sync(&ep->workitem);
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}
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/*
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* Note that endpoint_dealloc() also frees fifo memory (if allocated), even
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* though endpoint_alloc doesn't allocate that memory.
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*/
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static void endpoint_dealloc(struct xillyusb_endpoint *ep)
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{
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struct list_head *this, *next;
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fifo_mem_release(&ep->fifo);
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/* Join @filled_buffers with @buffers to free these entries too */
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list_splice(&ep->filled_buffers, &ep->buffers);
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list_for_each_safe(this, next, &ep->buffers) {
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struct xillybuffer *xb =
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list_entry(this, struct xillybuffer, entry);
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free_pages((unsigned long)xb->buf, ep->order);
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kfree(xb);
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}
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kfree(ep);
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}
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static struct xillyusb_endpoint
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*endpoint_alloc(struct xillyusb_dev *xdev,
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u8 ep_num,
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void (*work)(struct work_struct *),
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unsigned int order,
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int bufnum)
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{
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int i;
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struct xillyusb_endpoint *ep;
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ep = kzalloc(sizeof(*ep), GFP_KERNEL);
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if (!ep)
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return NULL;
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INIT_LIST_HEAD(&ep->buffers);
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INIT_LIST_HEAD(&ep->filled_buffers);
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spin_lock_init(&ep->buffers_lock);
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mutex_init(&ep->ep_mutex);
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init_usb_anchor(&ep->anchor);
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INIT_WORK(&ep->workitem, work);
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ep->order = order;
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ep->buffer_size = 1 << (PAGE_SHIFT + order);
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ep->outstanding_urbs = 0;
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ep->drained = true;
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ep->wake_on_drain = false;
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ep->xdev = xdev;
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ep->ep_num = ep_num;
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ep->shutting_down = false;
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for (i = 0; i < bufnum; i++) {
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struct xillybuffer *xb;
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unsigned long addr;
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xb = kzalloc(sizeof(*xb), GFP_KERNEL);
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if (!xb) {
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endpoint_dealloc(ep);
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return NULL;
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}
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addr = __get_free_pages(GFP_KERNEL, order);
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if (!addr) {
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kfree(xb);
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endpoint_dealloc(ep);
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return NULL;
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}
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xb->buf = (void *)addr;
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xb->ep = ep;
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list_add_tail(&xb->entry, &ep->buffers);
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}
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return ep;
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}
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static void cleanup_dev(struct kref *kref)
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{
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struct xillyusb_dev *xdev =
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container_of(kref, struct xillyusb_dev, kref);
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if (xdev->in_ep)
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endpoint_dealloc(xdev->in_ep);
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if (xdev->msg_ep)
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endpoint_dealloc(xdev->msg_ep);
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if (xdev->workq)
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destroy_workqueue(xdev->workq);
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kfree(xdev->channels); /* Argument may be NULL, and that's fine */
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kfree(xdev);
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}
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/*
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* @process_in_mutex is taken to ensure that bulk_in_work() won't call
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* process_bulk_in() after wakeup_all()'s execution: The latter zeroes all
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* @read_data_ok entries, which will make process_bulk_in() report false
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* errors if executed. The mechanism relies on that xdev->error is assigned
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* a non-zero value by report_io_error() prior to queueing wakeup_all(),
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* which prevents bulk_in_work() from calling process_bulk_in().
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*
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* The fact that wakeup_all() and bulk_in_work() are queued on the same
|
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* workqueue makes their concurrent execution very unlikely, however the
|
|
* kernel's API doesn't seem to ensure this strictly.
|
|
*/
|
|
|
|
static void wakeup_all(struct work_struct *work)
|
|
{
|
|
int i;
|
|
struct xillyusb_dev *xdev = container_of(work, struct xillyusb_dev,
|
|
wakeup_workitem);
|
|
|
|
mutex_lock(&xdev->process_in_mutex);
|
|
|
|
for (i = 0; i < xdev->num_channels; i++) {
|
|
struct xillyusb_channel *chan = &xdev->channels[i];
|
|
|
|
mutex_lock(&chan->lock);
|
|
|
|
if (chan->in_fifo) {
|
|
/*
|
|
* Fake an EOF: Even if such arrives, it won't be
|
|
* processed.
|
|
*/
|
|
chan->read_data_ok = 0;
|
|
wake_up_interruptible(&chan->in_fifo->waitq);
|
|
}
|
|
|
|
if (chan->out_ep)
|
|
wake_up_interruptible(&chan->out_ep->fifo.waitq);
|
|
|
|
mutex_unlock(&chan->lock);
|
|
|
|
wake_up_interruptible(&chan->flushq);
|
|
}
|
|
|
|
mutex_unlock(&xdev->process_in_mutex);
|
|
|
|
wake_up_interruptible(&xdev->msg_ep->fifo.waitq);
|
|
|
|
kref_put(&xdev->kref, cleanup_dev);
|
|
}
|
|
|
|
static void report_io_error(struct xillyusb_dev *xdev,
|
|
int errcode)
|
|
{
|
|
unsigned long flags;
|
|
bool do_once = false;
|
|
|
|
spin_lock_irqsave(&xdev->error_lock, flags);
|
|
if (!xdev->error) {
|
|
xdev->error = errcode;
|
|
do_once = true;
|
|
}
|
|
spin_unlock_irqrestore(&xdev->error_lock, flags);
|
|
|
|
if (do_once) {
|
|
kref_get(&xdev->kref); /* xdev is used by work item */
|
|
queue_work(xdev->workq, &xdev->wakeup_workitem);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* safely_assign_in_fifo() changes the value of chan->in_fifo and ensures
|
|
* the previous pointer is never used after its return.
|
|
*/
|
|
|
|
static void safely_assign_in_fifo(struct xillyusb_channel *chan,
|
|
struct xillyfifo *fifo)
|
|
{
|
|
mutex_lock(&chan->lock);
|
|
chan->in_fifo = fifo;
|
|
mutex_unlock(&chan->lock);
|
|
|
|
flush_work(&chan->xdev->in_ep->workitem);
|
|
}
|
|
|
|
static void bulk_in_completer(struct urb *urb)
|
|
{
|
|
struct xillybuffer *xb = urb->context;
|
|
struct xillyusb_endpoint *ep = xb->ep;
|
|
unsigned long flags;
|
|
|
|
if (urb->status) {
|
|
if (!(urb->status == -ENOENT ||
|
|
urb->status == -ECONNRESET ||
|
|
urb->status == -ESHUTDOWN))
|
|
report_io_error(ep->xdev, -EIO);
|
|
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
list_add_tail(&xb->entry, &ep->buffers);
|
|
ep->outstanding_urbs--;
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
return;
|
|
}
|
|
|
|
xb->len = urb->actual_length;
|
|
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
list_add_tail(&xb->entry, &ep->filled_buffers);
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
if (!ep->shutting_down)
|
|
queue_work(ep->xdev->workq, &ep->workitem);
|
|
}
|
|
|
|
static void bulk_out_completer(struct urb *urb)
|
|
{
|
|
struct xillybuffer *xb = urb->context;
|
|
struct xillyusb_endpoint *ep = xb->ep;
|
|
unsigned long flags;
|
|
|
|
if (urb->status &&
|
|
(!(urb->status == -ENOENT ||
|
|
urb->status == -ECONNRESET ||
|
|
urb->status == -ESHUTDOWN)))
|
|
report_io_error(ep->xdev, -EIO);
|
|
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
list_add_tail(&xb->entry, &ep->buffers);
|
|
ep->outstanding_urbs--;
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
if (!ep->shutting_down)
|
|
queue_work(ep->xdev->workq, &ep->workitem);
|
|
}
|
|
|
|
static void try_queue_bulk_in(struct xillyusb_endpoint *ep)
|
|
{
|
|
struct xillyusb_dev *xdev = ep->xdev;
|
|
struct xillybuffer *xb;
|
|
struct urb *urb;
|
|
|
|
int rc;
|
|
unsigned long flags;
|
|
unsigned int bufsize = ep->buffer_size;
|
|
|
|
mutex_lock(&ep->ep_mutex);
|
|
|
|
if (ep->shutting_down || xdev->error)
|
|
goto done;
|
|
|
|
while (1) {
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
|
|
if (list_empty(&ep->buffers)) {
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
goto done;
|
|
}
|
|
|
|
xb = list_first_entry(&ep->buffers, struct xillybuffer, entry);
|
|
list_del(&xb->entry);
|
|
ep->outstanding_urbs++;
|
|
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb) {
|
|
report_io_error(xdev, -ENOMEM);
|
|
goto relist;
|
|
}
|
|
|
|
usb_fill_bulk_urb(urb, xdev->udev,
|
|
usb_rcvbulkpipe(xdev->udev, ep->ep_num),
|
|
xb->buf, bufsize, bulk_in_completer, xb);
|
|
|
|
usb_anchor_urb(urb, &ep->anchor);
|
|
|
|
rc = usb_submit_urb(urb, GFP_KERNEL);
|
|
|
|
if (rc) {
|
|
report_io_error(xdev, (rc == -ENOMEM) ? -ENOMEM :
|
|
-EIO);
|
|
goto unanchor;
|
|
}
|
|
|
|
usb_free_urb(urb); /* This just decrements reference count */
|
|
}
|
|
|
|
unanchor:
|
|
usb_unanchor_urb(urb);
|
|
usb_free_urb(urb);
|
|
|
|
relist:
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
list_add_tail(&xb->entry, &ep->buffers);
|
|
ep->outstanding_urbs--;
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
done:
|
|
mutex_unlock(&ep->ep_mutex);
|
|
}
|
|
|
|
static void try_queue_bulk_out(struct xillyusb_endpoint *ep)
|
|
{
|
|
struct xillyfifo *fifo = &ep->fifo;
|
|
struct xillyusb_dev *xdev = ep->xdev;
|
|
struct xillybuffer *xb;
|
|
struct urb *urb;
|
|
|
|
int rc;
|
|
unsigned int fill;
|
|
unsigned long flags;
|
|
bool do_wake = false;
|
|
|
|
mutex_lock(&ep->ep_mutex);
|
|
|
|
if (ep->shutting_down || xdev->error)
|
|
goto done;
|
|
|
|
fill = READ_ONCE(fifo->fill) & ep->fill_mask;
|
|
|
|
while (1) {
|
|
int count;
|
|
unsigned int max_read;
|
|
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
|
|
/*
|
|
* Race conditions might have the FIFO filled while the
|
|
* endpoint is marked as drained here. That doesn't matter,
|
|
* because the sole purpose of @drained is to ensure that
|
|
* certain data has been sent on the USB channel before
|
|
* shutting it down. Hence knowing that the FIFO appears
|
|
* to be empty with no outstanding URBs at some moment
|
|
* is good enough.
|
|
*/
|
|
|
|
if (!fill) {
|
|
ep->drained = !ep->outstanding_urbs;
|
|
if (ep->drained && ep->wake_on_drain)
|
|
do_wake = true;
|
|
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
goto done;
|
|
}
|
|
|
|
ep->drained = false;
|
|
|
|
if ((fill < ep->buffer_size && ep->outstanding_urbs) ||
|
|
list_empty(&ep->buffers)) {
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
goto done;
|
|
}
|
|
|
|
xb = list_first_entry(&ep->buffers, struct xillybuffer, entry);
|
|
list_del(&xb->entry);
|
|
ep->outstanding_urbs++;
|
|
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
max_read = min(fill, ep->buffer_size);
|
|
|
|
count = fifo_read(&ep->fifo, xb->buf, max_read, xilly_memcpy);
|
|
|
|
/*
|
|
* xilly_memcpy always returns 0 => fifo_read can't fail =>
|
|
* count > 0
|
|
*/
|
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb) {
|
|
report_io_error(xdev, -ENOMEM);
|
|
goto relist;
|
|
}
|
|
|
|
usb_fill_bulk_urb(urb, xdev->udev,
|
|
usb_sndbulkpipe(xdev->udev, ep->ep_num),
|
|
xb->buf, count, bulk_out_completer, xb);
|
|
|
|
usb_anchor_urb(urb, &ep->anchor);
|
|
|
|
rc = usb_submit_urb(urb, GFP_KERNEL);
|
|
|
|
if (rc) {
|
|
report_io_error(xdev, (rc == -ENOMEM) ? -ENOMEM :
|
|
-EIO);
|
|
goto unanchor;
|
|
}
|
|
|
|
usb_free_urb(urb); /* This just decrements reference count */
|
|
|
|
fill -= count;
|
|
do_wake = true;
|
|
}
|
|
|
|
unanchor:
|
|
usb_unanchor_urb(urb);
|
|
usb_free_urb(urb);
|
|
|
|
relist:
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
list_add_tail(&xb->entry, &ep->buffers);
|
|
ep->outstanding_urbs--;
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
done:
|
|
mutex_unlock(&ep->ep_mutex);
|
|
|
|
if (do_wake)
|
|
wake_up_interruptible(&fifo->waitq);
|
|
}
|
|
|
|
static void bulk_out_work(struct work_struct *work)
|
|
{
|
|
struct xillyusb_endpoint *ep = container_of(work,
|
|
struct xillyusb_endpoint,
|
|
workitem);
|
|
try_queue_bulk_out(ep);
|
|
}
|
|
|
|
static int process_in_opcode(struct xillyusb_dev *xdev,
|
|
int opcode,
|
|
int chan_num)
|
|
{
|
|
struct xillyusb_channel *chan;
|
|
struct device *dev = xdev->dev;
|
|
int chan_idx = chan_num >> 1;
|
|
|
|
if (chan_idx >= xdev->num_channels) {
|
|
dev_err(dev, "Received illegal channel ID %d from FPGA\n",
|
|
chan_num);
|
|
return -EIO;
|
|
}
|
|
|
|
chan = &xdev->channels[chan_idx];
|
|
|
|
switch (opcode) {
|
|
case OPCODE_EOF:
|
|
if (!chan->read_data_ok) {
|
|
dev_err(dev, "Received unexpected EOF for channel %d\n",
|
|
chan_num);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* A write memory barrier ensures that the FIFO's fill level
|
|
* is visible before read_data_ok turns zero, so the data in
|
|
* the FIFO isn't missed by the consumer.
|
|
*/
|
|
smp_wmb();
|
|
WRITE_ONCE(chan->read_data_ok, 0);
|
|
wake_up_interruptible(&chan->in_fifo->waitq);
|
|
break;
|
|
|
|
case OPCODE_REACHED_CHECKPOINT:
|
|
chan->flushing = 0;
|
|
wake_up_interruptible(&chan->flushq);
|
|
break;
|
|
|
|
case OPCODE_CANCELED_CHECKPOINT:
|
|
chan->canceled = 1;
|
|
wake_up_interruptible(&chan->flushq);
|
|
break;
|
|
|
|
default:
|
|
dev_err(dev, "Received illegal opcode %d from FPGA\n",
|
|
opcode);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_bulk_in(struct xillybuffer *xb)
|
|
{
|
|
struct xillyusb_endpoint *ep = xb->ep;
|
|
struct xillyusb_dev *xdev = ep->xdev;
|
|
struct device *dev = xdev->dev;
|
|
int dws = xb->len >> 2;
|
|
__le32 *p = xb->buf;
|
|
u32 ctrlword;
|
|
struct xillyusb_channel *chan;
|
|
struct xillyfifo *fifo;
|
|
int chan_num = 0, opcode;
|
|
int chan_idx;
|
|
int bytes, count, dwconsume;
|
|
int in_bytes_left = 0;
|
|
int rc;
|
|
|
|
if ((dws << 2) != xb->len) {
|
|
dev_err(dev, "Received BULK IN transfer with %d bytes, not a multiple of 4\n",
|
|
xb->len);
|
|
return -EIO;
|
|
}
|
|
|
|
if (xdev->in_bytes_left) {
|
|
bytes = min(xdev->in_bytes_left, dws << 2);
|
|
in_bytes_left = xdev->in_bytes_left - bytes;
|
|
chan_num = xdev->leftover_chan_num;
|
|
goto resume_leftovers;
|
|
}
|
|
|
|
while (dws) {
|
|
ctrlword = le32_to_cpu(*p++);
|
|
dws--;
|
|
|
|
chan_num = ctrlword & 0xfff;
|
|
count = (ctrlword >> 12) & 0x3ff;
|
|
opcode = (ctrlword >> 24) & 0xf;
|
|
|
|
if (opcode != OPCODE_DATA) {
|
|
unsigned int in_counter = xdev->in_counter++ & 0x3ff;
|
|
|
|
if (count != in_counter) {
|
|
dev_err(dev, "Expected opcode counter %d, got %d\n",
|
|
in_counter, count);
|
|
return -EIO;
|
|
}
|
|
|
|
rc = process_in_opcode(xdev, opcode, chan_num);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
continue;
|
|
}
|
|
|
|
bytes = min(count + 1, dws << 2);
|
|
in_bytes_left = count + 1 - bytes;
|
|
|
|
resume_leftovers:
|
|
chan_idx = chan_num >> 1;
|
|
|
|
if (!(chan_num & 1) || chan_idx >= xdev->num_channels ||
|
|
!xdev->channels[chan_idx].read_data_ok) {
|
|
dev_err(dev, "Received illegal channel ID %d from FPGA\n",
|
|
chan_num);
|
|
return -EIO;
|
|
}
|
|
chan = &xdev->channels[chan_idx];
|
|
|
|
fifo = chan->in_fifo;
|
|
|
|
if (unlikely(!fifo))
|
|
return -EIO; /* We got really unexpected data */
|
|
|
|
if (bytes != fifo_write(fifo, p, bytes, xilly_memcpy)) {
|
|
dev_err(dev, "Misbehaving FPGA overflowed an upstream FIFO!\n");
|
|
return -EIO;
|
|
}
|
|
|
|
wake_up_interruptible(&fifo->waitq);
|
|
|
|
dwconsume = (bytes + 3) >> 2;
|
|
dws -= dwconsume;
|
|
p += dwconsume;
|
|
}
|
|
|
|
xdev->in_bytes_left = in_bytes_left;
|
|
xdev->leftover_chan_num = chan_num;
|
|
return 0;
|
|
}
|
|
|
|
static void bulk_in_work(struct work_struct *work)
|
|
{
|
|
struct xillyusb_endpoint *ep =
|
|
container_of(work, struct xillyusb_endpoint, workitem);
|
|
struct xillyusb_dev *xdev = ep->xdev;
|
|
unsigned long flags;
|
|
struct xillybuffer *xb;
|
|
bool consumed = false;
|
|
int rc = 0;
|
|
|
|
mutex_lock(&xdev->process_in_mutex);
|
|
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
|
|
while (1) {
|
|
if (rc || list_empty(&ep->filled_buffers)) {
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
mutex_unlock(&xdev->process_in_mutex);
|
|
|
|
if (rc)
|
|
report_io_error(xdev, rc);
|
|
else if (consumed)
|
|
try_queue_bulk_in(ep);
|
|
|
|
return;
|
|
}
|
|
|
|
xb = list_first_entry(&ep->filled_buffers, struct xillybuffer,
|
|
entry);
|
|
list_del(&xb->entry);
|
|
|
|
spin_unlock_irqrestore(&ep->buffers_lock, flags);
|
|
|
|
consumed = true;
|
|
|
|
if (!xdev->error)
|
|
rc = process_bulk_in(xb);
|
|
|
|
spin_lock_irqsave(&ep->buffers_lock, flags);
|
|
list_add_tail(&xb->entry, &ep->buffers);
|
|
ep->outstanding_urbs--;
|
|
}
|
|
}
|
|
|
|
static int xillyusb_send_opcode(struct xillyusb_dev *xdev,
|
|
int chan_num, char opcode, u32 data)
|
|
{
|
|
struct xillyusb_endpoint *ep = xdev->msg_ep;
|
|
struct xillyfifo *fifo = &ep->fifo;
|
|
__le32 msg[2];
|
|
|
|
int rc = 0;
|
|
|
|
msg[0] = cpu_to_le32((chan_num & 0xfff) |
|
|
((opcode & 0xf) << 24));
|
|
msg[1] = cpu_to_le32(data);
|
|
|
|
mutex_lock(&xdev->msg_mutex);
|
|
|
|
/*
|
|
* The wait queue is woken with the interruptible variant, so the
|
|
* wait function matches, however returning because of an interrupt
|
|
* will mess things up considerably, in particular when the caller is
|
|
* the release method. And the xdev->error part prevents being stuck
|
|
* forever in the event of a bizarre hardware bug: Pull the USB plug.
|
|
*/
|
|
|
|
while (wait_event_interruptible(fifo->waitq,
|
|
fifo->fill <= (fifo->size - 8) ||
|
|
xdev->error))
|
|
; /* Empty loop */
|
|
|
|
if (xdev->error) {
|
|
rc = xdev->error;
|
|
goto unlock_done;
|
|
}
|
|
|
|
fifo_write(fifo, (void *)msg, 8, xilly_memcpy);
|
|
|
|
try_queue_bulk_out(ep);
|
|
|
|
unlock_done:
|
|
mutex_unlock(&xdev->msg_mutex);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Note that flush_downstream() merely waits for the data to arrive to
|
|
* the application logic at the FPGA -- unlike PCIe Xillybus' counterpart,
|
|
* it does nothing to make it happen (and neither is it necessary).
|
|
*
|
|
* This function is not reentrant for the same @chan, but this is covered
|
|
* by the fact that for any given @chan, it's called either by the open,
|
|
* write, llseek and flush fops methods, which can't run in parallel (and the
|
|
* write + flush and llseek method handlers are protected with out_mutex).
|
|
*
|
|
* chan->flushed is there to avoid multiple flushes at the same position,
|
|
* in particular as a result of programs that close the file descriptor
|
|
* e.g. after a dup2() for redirection.
|
|
*/
|
|
|
|
static int flush_downstream(struct xillyusb_channel *chan,
|
|
long timeout,
|
|
bool interruptible)
|
|
{
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
int chan_num = chan->chan_idx << 1;
|
|
long deadline, left_to_sleep;
|
|
int rc;
|
|
|
|
if (chan->flushed)
|
|
return 0;
|
|
|
|
deadline = jiffies + 1 + timeout;
|
|
|
|
if (chan->flushing) {
|
|
long cancel_deadline = jiffies + 1 + XILLY_RESPONSE_TIMEOUT;
|
|
|
|
chan->canceled = 0;
|
|
rc = xillyusb_send_opcode(xdev, chan_num,
|
|
OPCODE_CANCEL_CHECKPOINT, 0);
|
|
|
|
if (rc)
|
|
return rc; /* Only real error, never -EINTR */
|
|
|
|
/* Ignoring interrupts. Cancellation must be handled */
|
|
while (!chan->canceled) {
|
|
left_to_sleep = cancel_deadline - ((long)jiffies);
|
|
|
|
if (left_to_sleep <= 0) {
|
|
report_io_error(xdev, -EIO);
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_event_interruptible_timeout(chan->flushq,
|
|
chan->canceled ||
|
|
xdev->error,
|
|
left_to_sleep);
|
|
|
|
if (xdev->error)
|
|
return xdev->error;
|
|
}
|
|
}
|
|
|
|
chan->flushing = 1;
|
|
|
|
/*
|
|
* The checkpoint is given in terms of data elements, not bytes. As
|
|
* a result, if less than an element's worth of data is stored in the
|
|
* FIFO, it's not flushed, including the flush before closing, which
|
|
* means that such data is lost. This is consistent with PCIe Xillybus.
|
|
*/
|
|
|
|
rc = xillyusb_send_opcode(xdev, chan_num,
|
|
OPCODE_SET_CHECKPOINT,
|
|
chan->out_bytes >>
|
|
chan->out_log2_element_size);
|
|
|
|
if (rc)
|
|
return rc; /* Only real error, never -EINTR */
|
|
|
|
if (!timeout) {
|
|
while (chan->flushing) {
|
|
rc = wait_event_interruptible(chan->flushq,
|
|
!chan->flushing ||
|
|
xdev->error);
|
|
if (xdev->error)
|
|
return xdev->error;
|
|
|
|
if (interruptible && rc)
|
|
return -EINTR;
|
|
}
|
|
|
|
goto done;
|
|
}
|
|
|
|
while (chan->flushing) {
|
|
left_to_sleep = deadline - ((long)jiffies);
|
|
|
|
if (left_to_sleep <= 0)
|
|
return -ETIMEDOUT;
|
|
|
|
rc = wait_event_interruptible_timeout(chan->flushq,
|
|
!chan->flushing ||
|
|
xdev->error,
|
|
left_to_sleep);
|
|
|
|
if (xdev->error)
|
|
return xdev->error;
|
|
|
|
if (interruptible && rc < 0)
|
|
return -EINTR;
|
|
}
|
|
|
|
done:
|
|
chan->flushed = 1;
|
|
return 0;
|
|
}
|
|
|
|
/* request_read_anything(): Ask the FPGA for any little amount of data */
|
|
static int request_read_anything(struct xillyusb_channel *chan,
|
|
char opcode)
|
|
{
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
unsigned int sh = chan->in_log2_element_size;
|
|
int chan_num = (chan->chan_idx << 1) | 1;
|
|
u32 mercy = chan->in_consumed_bytes + (2 << sh) - 1;
|
|
|
|
return xillyusb_send_opcode(xdev, chan_num, opcode, mercy >> sh);
|
|
}
|
|
|
|
static int xillyusb_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct xillyusb_dev *xdev;
|
|
struct xillyusb_channel *chan;
|
|
struct xillyfifo *in_fifo = NULL;
|
|
struct xillyusb_endpoint *out_ep = NULL;
|
|
int rc;
|
|
int index;
|
|
|
|
rc = xillybus_find_inode(inode, (void **)&xdev, &index);
|
|
if (rc)
|
|
return rc;
|
|
|
|
chan = &xdev->channels[index];
|
|
filp->private_data = chan;
|
|
|
|
mutex_lock(&chan->lock);
|
|
|
|
rc = -ENODEV;
|
|
|
|
if (xdev->error)
|
|
goto unmutex_fail;
|
|
|
|
if (((filp->f_mode & FMODE_READ) && !chan->readable) ||
|
|
((filp->f_mode & FMODE_WRITE) && !chan->writable))
|
|
goto unmutex_fail;
|
|
|
|
if ((filp->f_flags & O_NONBLOCK) && (filp->f_mode & FMODE_READ) &&
|
|
chan->in_synchronous) {
|
|
dev_err(xdev->dev,
|
|
"open() failed: O_NONBLOCK not allowed for read on this device\n");
|
|
goto unmutex_fail;
|
|
}
|
|
|
|
if ((filp->f_flags & O_NONBLOCK) && (filp->f_mode & FMODE_WRITE) &&
|
|
chan->out_synchronous) {
|
|
dev_err(xdev->dev,
|
|
"open() failed: O_NONBLOCK not allowed for write on this device\n");
|
|
goto unmutex_fail;
|
|
}
|
|
|
|
rc = -EBUSY;
|
|
|
|
if (((filp->f_mode & FMODE_READ) && chan->open_for_read) ||
|
|
((filp->f_mode & FMODE_WRITE) && chan->open_for_write))
|
|
goto unmutex_fail;
|
|
|
|
kref_get(&xdev->kref);
|
|
|
|
if (filp->f_mode & FMODE_READ)
|
|
chan->open_for_read = 1;
|
|
|
|
if (filp->f_mode & FMODE_WRITE)
|
|
chan->open_for_write = 1;
|
|
|
|
mutex_unlock(&chan->lock);
|
|
|
|
if (filp->f_mode & FMODE_WRITE) {
|
|
out_ep = endpoint_alloc(xdev,
|
|
(chan->chan_idx + 2) | USB_DIR_OUT,
|
|
bulk_out_work, BUF_SIZE_ORDER, BUFNUM);
|
|
|
|
if (!out_ep) {
|
|
rc = -ENOMEM;
|
|
goto unopen;
|
|
}
|
|
|
|
rc = fifo_init(&out_ep->fifo, chan->out_log2_fifo_size);
|
|
|
|
if (rc)
|
|
goto late_unopen;
|
|
|
|
out_ep->fill_mask = -(1 << chan->out_log2_element_size);
|
|
chan->out_bytes = 0;
|
|
chan->flushed = 0;
|
|
|
|
/*
|
|
* Sending a flush request to a previously closed stream
|
|
* effectively opens it, and also waits until the command is
|
|
* confirmed by the FPGA. The latter is necessary because the
|
|
* data is sent through a separate BULK OUT endpoint, and the
|
|
* xHCI controller is free to reorder transmissions.
|
|
*
|
|
* This can't go wrong unless there's a serious hardware error
|
|
* (or the computer is stuck for 500 ms?)
|
|
*/
|
|
rc = flush_downstream(chan, XILLY_RESPONSE_TIMEOUT, false);
|
|
|
|
if (rc == -ETIMEDOUT) {
|
|
rc = -EIO;
|
|
report_io_error(xdev, rc);
|
|
}
|
|
|
|
if (rc)
|
|
goto late_unopen;
|
|
}
|
|
|
|
if (filp->f_mode & FMODE_READ) {
|
|
in_fifo = kzalloc(sizeof(*in_fifo), GFP_KERNEL);
|
|
|
|
if (!in_fifo) {
|
|
rc = -ENOMEM;
|
|
goto late_unopen;
|
|
}
|
|
|
|
rc = fifo_init(in_fifo, chan->in_log2_fifo_size);
|
|
|
|
if (rc) {
|
|
kfree(in_fifo);
|
|
goto late_unopen;
|
|
}
|
|
}
|
|
|
|
mutex_lock(&chan->lock);
|
|
if (in_fifo) {
|
|
chan->in_fifo = in_fifo;
|
|
chan->read_data_ok = 1;
|
|
}
|
|
if (out_ep)
|
|
chan->out_ep = out_ep;
|
|
mutex_unlock(&chan->lock);
|
|
|
|
if (in_fifo) {
|
|
u32 in_checkpoint = 0;
|
|
|
|
if (!chan->in_synchronous)
|
|
in_checkpoint = in_fifo->size >>
|
|
chan->in_log2_element_size;
|
|
|
|
chan->in_consumed_bytes = 0;
|
|
chan->poll_used = 0;
|
|
chan->in_current_checkpoint = in_checkpoint;
|
|
rc = xillyusb_send_opcode(xdev, (chan->chan_idx << 1) | 1,
|
|
OPCODE_SET_CHECKPOINT,
|
|
in_checkpoint);
|
|
|
|
if (rc) /* Failure guarantees that opcode wasn't sent */
|
|
goto unfifo;
|
|
|
|
/*
|
|
* In non-blocking mode, request the FPGA to send any data it
|
|
* has right away. Otherwise, the first read() will always
|
|
* return -EAGAIN, which is OK strictly speaking, but ugly.
|
|
* Checking and unrolling if this fails isn't worth the
|
|
* effort -- the error is propagated to the first read()
|
|
* anyhow.
|
|
*/
|
|
if (filp->f_flags & O_NONBLOCK)
|
|
request_read_anything(chan, OPCODE_SET_PUSH);
|
|
}
|
|
|
|
return 0;
|
|
|
|
unfifo:
|
|
chan->read_data_ok = 0;
|
|
safely_assign_in_fifo(chan, NULL);
|
|
fifo_mem_release(in_fifo);
|
|
kfree(in_fifo);
|
|
|
|
if (out_ep) {
|
|
mutex_lock(&chan->lock);
|
|
chan->out_ep = NULL;
|
|
mutex_unlock(&chan->lock);
|
|
}
|
|
|
|
late_unopen:
|
|
if (out_ep)
|
|
endpoint_dealloc(out_ep);
|
|
|
|
unopen:
|
|
mutex_lock(&chan->lock);
|
|
|
|
if (filp->f_mode & FMODE_READ)
|
|
chan->open_for_read = 0;
|
|
|
|
if (filp->f_mode & FMODE_WRITE)
|
|
chan->open_for_write = 0;
|
|
|
|
mutex_unlock(&chan->lock);
|
|
|
|
kref_put(&xdev->kref, cleanup_dev);
|
|
|
|
return rc;
|
|
|
|
unmutex_fail:
|
|
mutex_unlock(&chan->lock);
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t xillyusb_read(struct file *filp, char __user *userbuf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
struct xillyusb_channel *chan = filp->private_data;
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
struct xillyfifo *fifo = chan->in_fifo;
|
|
int chan_num = (chan->chan_idx << 1) | 1;
|
|
|
|
long deadline, left_to_sleep;
|
|
int bytes_done = 0;
|
|
bool sent_set_push = false;
|
|
int rc;
|
|
|
|
deadline = jiffies + 1 + XILLY_RX_TIMEOUT;
|
|
|
|
rc = mutex_lock_interruptible(&chan->in_mutex);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
while (1) {
|
|
u32 fifo_checkpoint_bytes, complete_checkpoint_bytes;
|
|
u32 complete_checkpoint, fifo_checkpoint;
|
|
u32 checkpoint;
|
|
s32 diff, leap;
|
|
unsigned int sh = chan->in_log2_element_size;
|
|
bool checkpoint_for_complete;
|
|
|
|
rc = fifo_read(fifo, (__force void *)userbuf + bytes_done,
|
|
count - bytes_done, xilly_copy_to_user);
|
|
|
|
if (rc < 0)
|
|
break;
|
|
|
|
bytes_done += rc;
|
|
chan->in_consumed_bytes += rc;
|
|
|
|
left_to_sleep = deadline - ((long)jiffies);
|
|
|
|
/*
|
|
* Some 32-bit arithmetic that may wrap. Note that
|
|
* complete_checkpoint is rounded up to the closest element
|
|
* boundary, because the read() can't be completed otherwise.
|
|
* fifo_checkpoint_bytes is rounded down, because it protects
|
|
* in_fifo from overflowing.
|
|
*/
|
|
|
|
fifo_checkpoint_bytes = chan->in_consumed_bytes + fifo->size;
|
|
complete_checkpoint_bytes =
|
|
chan->in_consumed_bytes + count - bytes_done;
|
|
|
|
fifo_checkpoint = fifo_checkpoint_bytes >> sh;
|
|
complete_checkpoint =
|
|
(complete_checkpoint_bytes + (1 << sh) - 1) >> sh;
|
|
|
|
diff = (fifo_checkpoint - complete_checkpoint) << sh;
|
|
|
|
if (chan->in_synchronous && diff >= 0) {
|
|
checkpoint = complete_checkpoint;
|
|
checkpoint_for_complete = true;
|
|
} else {
|
|
checkpoint = fifo_checkpoint;
|
|
checkpoint_for_complete = false;
|
|
}
|
|
|
|
leap = (checkpoint - chan->in_current_checkpoint) << sh;
|
|
|
|
/*
|
|
* To prevent flooding of OPCODE_SET_CHECKPOINT commands as
|
|
* data is consumed, it's issued only if it moves the
|
|
* checkpoint by at least an 8th of the FIFO's size, or if
|
|
* it's necessary to complete the number of bytes requested by
|
|
* the read() call.
|
|
*
|
|
* chan->read_data_ok is checked to spare an unnecessary
|
|
* submission after receiving EOF, however it's harmless if
|
|
* such slips away.
|
|
*/
|
|
|
|
if (chan->read_data_ok &&
|
|
(leap > (fifo->size >> 3) ||
|
|
(checkpoint_for_complete && leap > 0))) {
|
|
chan->in_current_checkpoint = checkpoint;
|
|
rc = xillyusb_send_opcode(xdev, chan_num,
|
|
OPCODE_SET_CHECKPOINT,
|
|
checkpoint);
|
|
|
|
if (rc)
|
|
break;
|
|
}
|
|
|
|
if (bytes_done == count ||
|
|
(left_to_sleep <= 0 && bytes_done))
|
|
break;
|
|
|
|
/*
|
|
* Reaching here means that the FIFO was empty when
|
|
* fifo_read() returned, but not necessarily right now. Error
|
|
* and EOF are checked and reported only now, so that no data
|
|
* that managed its way to the FIFO is lost.
|
|
*/
|
|
|
|
if (!READ_ONCE(chan->read_data_ok)) { /* FPGA has sent EOF */
|
|
/* Has data slipped into the FIFO since fifo_read()? */
|
|
smp_rmb();
|
|
if (READ_ONCE(fifo->fill))
|
|
continue;
|
|
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
if (xdev->error) {
|
|
rc = xdev->error;
|
|
break;
|
|
}
|
|
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
rc = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
if (!sent_set_push) {
|
|
rc = xillyusb_send_opcode(xdev, chan_num,
|
|
OPCODE_SET_PUSH,
|
|
complete_checkpoint);
|
|
|
|
if (rc)
|
|
break;
|
|
|
|
sent_set_push = true;
|
|
}
|
|
|
|
if (left_to_sleep > 0) {
|
|
/*
|
|
* Note that when xdev->error is set (e.g. when the
|
|
* device is unplugged), read_data_ok turns zero and
|
|
* fifo->waitq is awaken.
|
|
* Therefore no special attention to xdev->error.
|
|
*/
|
|
|
|
rc = wait_event_interruptible_timeout
|
|
(fifo->waitq,
|
|
fifo->fill || !chan->read_data_ok,
|
|
left_to_sleep);
|
|
} else { /* bytes_done == 0 */
|
|
/* Tell FPGA to send anything it has */
|
|
rc = request_read_anything(chan, OPCODE_UPDATE_PUSH);
|
|
|
|
if (rc)
|
|
break;
|
|
|
|
rc = wait_event_interruptible
|
|
(fifo->waitq,
|
|
fifo->fill || !chan->read_data_ok);
|
|
}
|
|
|
|
if (rc < 0) {
|
|
rc = -EINTR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (((filp->f_flags & O_NONBLOCK) || chan->poll_used) &&
|
|
!READ_ONCE(fifo->fill))
|
|
request_read_anything(chan, OPCODE_SET_PUSH);
|
|
|
|
mutex_unlock(&chan->in_mutex);
|
|
|
|
if (bytes_done)
|
|
return bytes_done;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int xillyusb_flush(struct file *filp, fl_owner_t id)
|
|
{
|
|
struct xillyusb_channel *chan = filp->private_data;
|
|
int rc;
|
|
|
|
if (!(filp->f_mode & FMODE_WRITE))
|
|
return 0;
|
|
|
|
rc = mutex_lock_interruptible(&chan->out_mutex);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* One second's timeout on flushing. Interrupts are ignored, because if
|
|
* the user pressed CTRL-C, that interrupt will still be in flight by
|
|
* the time we reach here, and the opportunity to flush is lost.
|
|
*/
|
|
rc = flush_downstream(chan, HZ, false);
|
|
|
|
mutex_unlock(&chan->out_mutex);
|
|
|
|
if (rc == -ETIMEDOUT) {
|
|
/* The things you do to use dev_warn() and not pr_warn() */
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
|
|
mutex_lock(&chan->lock);
|
|
if (!xdev->error)
|
|
dev_warn(xdev->dev,
|
|
"Timed out while flushing. Output data may be lost.\n");
|
|
mutex_unlock(&chan->lock);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t xillyusb_write(struct file *filp, const char __user *userbuf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
struct xillyusb_channel *chan = filp->private_data;
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
struct xillyfifo *fifo = &chan->out_ep->fifo;
|
|
int rc;
|
|
|
|
rc = mutex_lock_interruptible(&chan->out_mutex);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
while (1) {
|
|
if (xdev->error) {
|
|
rc = xdev->error;
|
|
break;
|
|
}
|
|
|
|
if (count == 0)
|
|
break;
|
|
|
|
rc = fifo_write(fifo, (__force void *)userbuf, count,
|
|
xilly_copy_from_user);
|
|
|
|
if (rc != 0)
|
|
break;
|
|
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
rc = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
if (wait_event_interruptible
|
|
(fifo->waitq,
|
|
fifo->fill != fifo->size || xdev->error)) {
|
|
rc = -EINTR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (rc < 0)
|
|
goto done;
|
|
|
|
chan->out_bytes += rc;
|
|
|
|
if (rc) {
|
|
try_queue_bulk_out(chan->out_ep);
|
|
chan->flushed = 0;
|
|
}
|
|
|
|
if (chan->out_synchronous) {
|
|
int flush_rc = flush_downstream(chan, 0, true);
|
|
|
|
if (flush_rc && !rc)
|
|
rc = flush_rc;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&chan->out_mutex);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int xillyusb_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct xillyusb_channel *chan = filp->private_data;
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
int rc_read = 0, rc_write = 0;
|
|
|
|
if (filp->f_mode & FMODE_READ) {
|
|
struct xillyfifo *in_fifo = chan->in_fifo;
|
|
|
|
rc_read = xillyusb_send_opcode(xdev, (chan->chan_idx << 1) | 1,
|
|
OPCODE_CLOSE, 0);
|
|
/*
|
|
* If rc_read is nonzero, xdev->error indicates a global
|
|
* device error. The error is reported later, so that
|
|
* resources are freed.
|
|
*
|
|
* Looping on wait_event_interruptible() kinda breaks the idea
|
|
* of being interruptible, and this should have been
|
|
* wait_event(). Only it's being waken with
|
|
* wake_up_interruptible() for the sake of other uses. If
|
|
* there's a global device error, chan->read_data_ok is
|
|
* deasserted and the wait queue is awaken, so this is covered.
|
|
*/
|
|
|
|
while (wait_event_interruptible(in_fifo->waitq,
|
|
!chan->read_data_ok))
|
|
; /* Empty loop */
|
|
|
|
safely_assign_in_fifo(chan, NULL);
|
|
fifo_mem_release(in_fifo);
|
|
kfree(in_fifo);
|
|
|
|
mutex_lock(&chan->lock);
|
|
chan->open_for_read = 0;
|
|
mutex_unlock(&chan->lock);
|
|
}
|
|
|
|
if (filp->f_mode & FMODE_WRITE) {
|
|
struct xillyusb_endpoint *ep = chan->out_ep;
|
|
/*
|
|
* chan->flushing isn't zeroed. If the pre-release flush timed
|
|
* out, a cancel request will be sent before the next
|
|
* OPCODE_SET_CHECKPOINT (i.e. when the file is opened again).
|
|
* This is despite that the FPGA forgets about the checkpoint
|
|
* request as the file closes. Still, in an exceptional race
|
|
* condition, the FPGA could send an OPCODE_REACHED_CHECKPOINT
|
|
* just before closing that would reach the host after the
|
|
* file has re-opened.
|
|
*/
|
|
|
|
mutex_lock(&chan->lock);
|
|
chan->out_ep = NULL;
|
|
mutex_unlock(&chan->lock);
|
|
|
|
endpoint_quiesce(ep);
|
|
endpoint_dealloc(ep);
|
|
|
|
/* See comments on rc_read above */
|
|
rc_write = xillyusb_send_opcode(xdev, chan->chan_idx << 1,
|
|
OPCODE_CLOSE, 0);
|
|
|
|
mutex_lock(&chan->lock);
|
|
chan->open_for_write = 0;
|
|
mutex_unlock(&chan->lock);
|
|
}
|
|
|
|
kref_put(&xdev->kref, cleanup_dev);
|
|
|
|
return rc_read ? rc_read : rc_write;
|
|
}
|
|
|
|
/*
|
|
* Xillybus' API allows device nodes to be seekable, giving the user
|
|
* application access to a RAM array on the FPGA (or logic emulating it).
|
|
*/
|
|
|
|
static loff_t xillyusb_llseek(struct file *filp, loff_t offset, int whence)
|
|
{
|
|
struct xillyusb_channel *chan = filp->private_data;
|
|
struct xillyusb_dev *xdev = chan->xdev;
|
|
loff_t pos = filp->f_pos;
|
|
int rc = 0;
|
|
unsigned int log2_element_size = chan->readable ?
|
|
chan->in_log2_element_size : chan->out_log2_element_size;
|
|
|
|
/*
|
|
* Take both mutexes not allowing interrupts, since it seems like
|
|
* common applications don't expect an -EINTR here. Besides, multiple
|
|
* access to a single file descriptor on seekable devices is a mess
|
|
* anyhow.
|
|
*/
|
|
|
|
mutex_lock(&chan->out_mutex);
|
|
mutex_lock(&chan->in_mutex);
|
|
|
|
switch (whence) {
|
|
case SEEK_SET:
|
|
pos = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
pos += offset;
|
|
break;
|
|
case SEEK_END:
|
|
pos = offset; /* Going to the end => to the beginning */
|
|
break;
|
|
default:
|
|
rc = -EINVAL;
|
|
goto end;
|
|
}
|
|
|
|
/* In any case, we must finish on an element boundary */
|
|
if (pos & ((1 << log2_element_size) - 1)) {
|
|
rc = -EINVAL;
|
|
goto end;
|
|
}
|
|
|
|
rc = xillyusb_send_opcode(xdev, chan->chan_idx << 1,
|
|
OPCODE_SET_ADDR,
|
|
pos >> log2_element_size);
|
|
|
|
if (rc)
|
|
goto end;
|
|
|
|
if (chan->writable) {
|
|
chan->flushed = 0;
|
|
rc = flush_downstream(chan, HZ, false);
|
|
}
|
|
|
|
end:
|
|
mutex_unlock(&chan->out_mutex);
|
|
mutex_unlock(&chan->in_mutex);
|
|
|
|
if (rc) /* Return error after releasing mutexes */
|
|
return rc;
|
|
|
|
filp->f_pos = pos;
|
|
|
|
return pos;
|
|
}
|
|
|
|
static __poll_t xillyusb_poll(struct file *filp, poll_table *wait)
|
|
{
|
|
struct xillyusb_channel *chan = filp->private_data;
|
|
__poll_t mask = 0;
|
|
|
|
if (chan->in_fifo)
|
|
poll_wait(filp, &chan->in_fifo->waitq, wait);
|
|
|
|
if (chan->out_ep)
|
|
poll_wait(filp, &chan->out_ep->fifo.waitq, wait);
|
|
|
|
/*
|
|
* If this is the first time poll() is called, and the file is
|
|
* readable, set the relevant flag. Also tell the FPGA to send all it
|
|
* has, to kickstart the mechanism that ensures there's always some
|
|
* data in in_fifo unless the stream is dry end-to-end. Note that the
|
|
* first poll() may not return a EPOLLIN, even if there's data on the
|
|
* FPGA. Rather, the data will arrive soon, and trigger the relevant
|
|
* wait queue.
|
|
*/
|
|
|
|
if (!chan->poll_used && chan->in_fifo) {
|
|
chan->poll_used = 1;
|
|
request_read_anything(chan, OPCODE_SET_PUSH);
|
|
}
|
|
|
|
/*
|
|
* poll() won't play ball regarding read() channels which
|
|
* are synchronous. Allowing that will create situations where data has
|
|
* been delivered at the FPGA, and users expecting select() to wake up,
|
|
* which it may not. So make it never work.
|
|
*/
|
|
|
|
if (chan->in_fifo && !chan->in_synchronous &&
|
|
(READ_ONCE(chan->in_fifo->fill) || !chan->read_data_ok))
|
|
mask |= EPOLLIN | EPOLLRDNORM;
|
|
|
|
if (chan->out_ep &&
|
|
(READ_ONCE(chan->out_ep->fifo.fill) != chan->out_ep->fifo.size))
|
|
mask |= EPOLLOUT | EPOLLWRNORM;
|
|
|
|
if (chan->xdev->error)
|
|
mask |= EPOLLERR;
|
|
|
|
return mask;
|
|
}
|
|
|
|
static const struct file_operations xillyusb_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = xillyusb_read,
|
|
.write = xillyusb_write,
|
|
.open = xillyusb_open,
|
|
.flush = xillyusb_flush,
|
|
.release = xillyusb_release,
|
|
.llseek = xillyusb_llseek,
|
|
.poll = xillyusb_poll,
|
|
};
|
|
|
|
static int xillyusb_setup_base_eps(struct xillyusb_dev *xdev)
|
|
{
|
|
xdev->msg_ep = endpoint_alloc(xdev, MSG_EP_NUM | USB_DIR_OUT,
|
|
bulk_out_work, 1, 2);
|
|
if (!xdev->msg_ep)
|
|
return -ENOMEM;
|
|
|
|
if (fifo_init(&xdev->msg_ep->fifo, 13)) /* 8 kiB */
|
|
goto dealloc;
|
|
|
|
xdev->msg_ep->fill_mask = -8; /* 8 bytes granularity */
|
|
|
|
xdev->in_ep = endpoint_alloc(xdev, IN_EP_NUM | USB_DIR_IN,
|
|
bulk_in_work, BUF_SIZE_ORDER, BUFNUM);
|
|
if (!xdev->in_ep)
|
|
goto dealloc;
|
|
|
|
try_queue_bulk_in(xdev->in_ep);
|
|
|
|
return 0;
|
|
|
|
dealloc:
|
|
endpoint_dealloc(xdev->msg_ep); /* Also frees FIFO mem if allocated */
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int setup_channels(struct xillyusb_dev *xdev,
|
|
__le16 *chandesc,
|
|
int num_channels)
|
|
{
|
|
struct xillyusb_channel *chan;
|
|
int i;
|
|
|
|
chan = kcalloc(num_channels, sizeof(*chan), GFP_KERNEL);
|
|
if (!chan)
|
|
return -ENOMEM;
|
|
|
|
xdev->channels = chan;
|
|
|
|
for (i = 0; i < num_channels; i++, chan++) {
|
|
unsigned int in_desc = le16_to_cpu(*chandesc++);
|
|
unsigned int out_desc = le16_to_cpu(*chandesc++);
|
|
|
|
chan->xdev = xdev;
|
|
mutex_init(&chan->in_mutex);
|
|
mutex_init(&chan->out_mutex);
|
|
mutex_init(&chan->lock);
|
|
init_waitqueue_head(&chan->flushq);
|
|
|
|
chan->chan_idx = i;
|
|
|
|
if (in_desc & 0x80) { /* Entry is valid */
|
|
chan->readable = 1;
|
|
chan->in_synchronous = !!(in_desc & 0x40);
|
|
chan->in_seekable = !!(in_desc & 0x20);
|
|
chan->in_log2_element_size = in_desc & 0x0f;
|
|
chan->in_log2_fifo_size = ((in_desc >> 8) & 0x1f) + 16;
|
|
}
|
|
|
|
/*
|
|
* A downstream channel should never exist above index 13,
|
|
* as it would request a nonexistent BULK endpoint > 15.
|
|
* In the peculiar case that it does, it's ignored silently.
|
|
*/
|
|
|
|
if ((out_desc & 0x80) && i < 14) { /* Entry is valid */
|
|
chan->writable = 1;
|
|
chan->out_synchronous = !!(out_desc & 0x40);
|
|
chan->out_seekable = !!(out_desc & 0x20);
|
|
chan->out_log2_element_size = out_desc & 0x0f;
|
|
chan->out_log2_fifo_size =
|
|
((out_desc >> 8) & 0x1f) + 16;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xillyusb_discovery(struct usb_interface *interface)
|
|
{
|
|
int rc;
|
|
struct xillyusb_dev *xdev = usb_get_intfdata(interface);
|
|
__le16 bogus_chandesc[2];
|
|
struct xillyfifo idt_fifo;
|
|
struct xillyusb_channel *chan;
|
|
unsigned int idt_len, names_offset;
|
|
unsigned char *idt;
|
|
int num_channels;
|
|
|
|
rc = xillyusb_send_opcode(xdev, ~0, OPCODE_QUIESCE, 0);
|
|
|
|
if (rc) {
|
|
dev_err(&interface->dev, "Failed to send quiesce request. Aborting.\n");
|
|
return rc;
|
|
}
|
|
|
|
/* Phase I: Set up one fake upstream channel and obtain IDT */
|
|
|
|
/* Set up a fake IDT with one async IN stream */
|
|
bogus_chandesc[0] = cpu_to_le16(0x80);
|
|
bogus_chandesc[1] = cpu_to_le16(0);
|
|
|
|
rc = setup_channels(xdev, bogus_chandesc, 1);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = fifo_init(&idt_fifo, LOG2_IDT_FIFO_SIZE);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
chan = xdev->channels;
|
|
|
|
chan->in_fifo = &idt_fifo;
|
|
chan->read_data_ok = 1;
|
|
|
|
xdev->num_channels = 1;
|
|
|
|
rc = xillyusb_send_opcode(xdev, ~0, OPCODE_REQ_IDT, 0);
|
|
|
|
if (rc) {
|
|
dev_err(&interface->dev, "Failed to send IDT request. Aborting.\n");
|
|
goto unfifo;
|
|
}
|
|
|
|
rc = wait_event_interruptible_timeout(idt_fifo.waitq,
|
|
!chan->read_data_ok,
|
|
XILLY_RESPONSE_TIMEOUT);
|
|
|
|
if (xdev->error) {
|
|
rc = xdev->error;
|
|
goto unfifo;
|
|
}
|
|
|
|
if (rc < 0) {
|
|
rc = -EINTR; /* Interrupt on probe method? Interesting. */
|
|
goto unfifo;
|
|
}
|
|
|
|
if (chan->read_data_ok) {
|
|
rc = -ETIMEDOUT;
|
|
dev_err(&interface->dev, "No response from FPGA. Aborting.\n");
|
|
goto unfifo;
|
|
}
|
|
|
|
idt_len = READ_ONCE(idt_fifo.fill);
|
|
idt = kmalloc(idt_len, GFP_KERNEL);
|
|
|
|
if (!idt) {
|
|
rc = -ENOMEM;
|
|
goto unfifo;
|
|
}
|
|
|
|
fifo_read(&idt_fifo, idt, idt_len, xilly_memcpy);
|
|
|
|
if (crc32_le(~0, idt, idt_len) != 0) {
|
|
dev_err(&interface->dev, "IDT failed CRC check. Aborting.\n");
|
|
rc = -ENODEV;
|
|
goto unidt;
|
|
}
|
|
|
|
if (*idt > 0x90) {
|
|
dev_err(&interface->dev, "No support for IDT version 0x%02x. Maybe the xillyusb driver needs an upgrade. Aborting.\n",
|
|
(int)*idt);
|
|
rc = -ENODEV;
|
|
goto unidt;
|
|
}
|
|
|
|
/* Phase II: Set up the streams as defined in IDT */
|
|
|
|
num_channels = le16_to_cpu(*((__le16 *)(idt + 1)));
|
|
names_offset = 3 + num_channels * 4;
|
|
idt_len -= 4; /* Exclude CRC */
|
|
|
|
if (idt_len < names_offset) {
|
|
dev_err(&interface->dev, "IDT too short. This is exceptionally weird, because its CRC is OK\n");
|
|
rc = -ENODEV;
|
|
goto unidt;
|
|
}
|
|
|
|
rc = setup_channels(xdev, (void *)idt + 3, num_channels);
|
|
|
|
if (rc)
|
|
goto unidt;
|
|
|
|
/*
|
|
* Except for wildly misbehaving hardware, or if it was disconnected
|
|
* just after responding with the IDT, there is no reason for any
|
|
* work item to be running now. To be sure that xdev->channels
|
|
* is updated on anything that might run in parallel, flush the
|
|
* workqueue, which rarely does anything.
|
|
*/
|
|
flush_workqueue(xdev->workq);
|
|
|
|
xdev->num_channels = num_channels;
|
|
|
|
fifo_mem_release(&idt_fifo);
|
|
kfree(chan);
|
|
|
|
rc = xillybus_init_chrdev(&interface->dev, &xillyusb_fops,
|
|
THIS_MODULE, xdev,
|
|
idt + names_offset,
|
|
idt_len - names_offset,
|
|
num_channels,
|
|
xillyname, true);
|
|
|
|
kfree(idt);
|
|
|
|
return rc;
|
|
|
|
unidt:
|
|
kfree(idt);
|
|
|
|
unfifo:
|
|
safely_assign_in_fifo(chan, NULL);
|
|
fifo_mem_release(&idt_fifo);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int xillyusb_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct xillyusb_dev *xdev;
|
|
int rc;
|
|
|
|
xdev = kzalloc(sizeof(*xdev), GFP_KERNEL);
|
|
if (!xdev)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&xdev->kref);
|
|
mutex_init(&xdev->process_in_mutex);
|
|
mutex_init(&xdev->msg_mutex);
|
|
|
|
xdev->udev = usb_get_dev(interface_to_usbdev(interface));
|
|
xdev->dev = &interface->dev;
|
|
xdev->error = 0;
|
|
spin_lock_init(&xdev->error_lock);
|
|
xdev->in_counter = 0;
|
|
xdev->in_bytes_left = 0;
|
|
xdev->workq = alloc_workqueue(xillyname, WQ_HIGHPRI, 0);
|
|
|
|
if (!xdev->workq) {
|
|
dev_err(&interface->dev, "Failed to allocate work queue\n");
|
|
rc = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
INIT_WORK(&xdev->wakeup_workitem, wakeup_all);
|
|
|
|
usb_set_intfdata(interface, xdev);
|
|
|
|
rc = xillyusb_setup_base_eps(xdev);
|
|
if (rc)
|
|
goto fail;
|
|
|
|
rc = xillyusb_discovery(interface);
|
|
if (rc)
|
|
goto latefail;
|
|
|
|
return 0;
|
|
|
|
latefail:
|
|
endpoint_quiesce(xdev->in_ep);
|
|
endpoint_quiesce(xdev->msg_ep);
|
|
|
|
fail:
|
|
usb_set_intfdata(interface, NULL);
|
|
kref_put(&xdev->kref, cleanup_dev);
|
|
return rc;
|
|
}
|
|
|
|
static void xillyusb_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct xillyusb_dev *xdev = usb_get_intfdata(interface);
|
|
struct xillyusb_endpoint *msg_ep = xdev->msg_ep;
|
|
struct xillyfifo *fifo = &msg_ep->fifo;
|
|
int rc;
|
|
int i;
|
|
|
|
xillybus_cleanup_chrdev(xdev, &interface->dev);
|
|
|
|
/*
|
|
* Try to send OPCODE_QUIESCE, which will fail silently if the device
|
|
* was disconnected, but makes sense on module unload.
|
|
*/
|
|
|
|
msg_ep->wake_on_drain = true;
|
|
xillyusb_send_opcode(xdev, ~0, OPCODE_QUIESCE, 0);
|
|
|
|
/*
|
|
* If the device has been disconnected, sending the opcode causes
|
|
* a global device error with xdev->error, if such error didn't
|
|
* occur earlier. Hence timing out means that the USB link is fine,
|
|
* but somehow the message wasn't sent. Should never happen.
|
|
*/
|
|
|
|
rc = wait_event_interruptible_timeout(fifo->waitq,
|
|
msg_ep->drained || xdev->error,
|
|
XILLY_RESPONSE_TIMEOUT);
|
|
|
|
if (!rc)
|
|
dev_err(&interface->dev,
|
|
"Weird timeout condition on sending quiesce request.\n");
|
|
|
|
report_io_error(xdev, -ENODEV); /* Discourage further activity */
|
|
|
|
/*
|
|
* This device driver is declared with soft_unbind set, or else
|
|
* sending OPCODE_QUIESCE above would always fail. The price is
|
|
* that the USB framework didn't kill outstanding URBs, so it has
|
|
* to be done explicitly before returning from this call.
|
|
*/
|
|
|
|
for (i = 0; i < xdev->num_channels; i++) {
|
|
struct xillyusb_channel *chan = &xdev->channels[i];
|
|
|
|
/*
|
|
* Lock taken to prevent chan->out_ep from changing. It also
|
|
* ensures xillyusb_open() and xillyusb_flush() don't access
|
|
* xdev->dev after being nullified below.
|
|
*/
|
|
mutex_lock(&chan->lock);
|
|
if (chan->out_ep)
|
|
endpoint_quiesce(chan->out_ep);
|
|
mutex_unlock(&chan->lock);
|
|
}
|
|
|
|
endpoint_quiesce(xdev->in_ep);
|
|
endpoint_quiesce(xdev->msg_ep);
|
|
|
|
usb_set_intfdata(interface, NULL);
|
|
|
|
xdev->dev = NULL;
|
|
|
|
kref_put(&xdev->kref, cleanup_dev);
|
|
}
|
|
|
|
static struct usb_driver xillyusb_driver = {
|
|
.name = xillyname,
|
|
.id_table = xillyusb_table,
|
|
.probe = xillyusb_probe,
|
|
.disconnect = xillyusb_disconnect,
|
|
.soft_unbind = 1,
|
|
};
|
|
|
|
static int __init xillyusb_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (LOG2_INITIAL_FIFO_BUF_SIZE > PAGE_SHIFT)
|
|
fifo_buf_order = LOG2_INITIAL_FIFO_BUF_SIZE - PAGE_SHIFT;
|
|
else
|
|
fifo_buf_order = 0;
|
|
|
|
rc = usb_register(&xillyusb_driver);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit xillyusb_exit(void)
|
|
{
|
|
usb_deregister(&xillyusb_driver);
|
|
}
|
|
|
|
module_init(xillyusb_init);
|
|
module_exit(xillyusb_exit);
|