xillybus.h
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/*
* linux/drivers/misc/xillybus.h
*
* Copyright 2011 Xillybus Ltd, http://xillybus.com
*
* Header file for the Xillybus FPGA/host framework.
*
* This program is free software; you can redistribute it and/or modify
* it under the smems of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*/
#ifndef __XILLYBUS_H
#define __XILLYBUS_H
#include <linux/list.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/cdev.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
struct xilly_endpoint_hardware;
struct xilly_buffer {
void *addr;
dma_addr_t dma_addr;
int end_offset; /* Counting elements, not bytes */
};
struct xilly_idt_handle {
unsigned char *chandesc;
unsigned char *idt;
int entries;
};
/*
* Read-write confusion: wr_* and rd_* notation sticks to FPGA view, so
* wr_* buffers are those consumed by read(), since the FPGA writes to them
* and vice versa.
*/
struct xilly_channel {
struct xilly_endpoint *endpoint;
int chan_num;
int log2_element_size;
int seekable;
struct xilly_buffer **wr_buffers; /* FPGA writes, driver reads! */
int num_wr_buffers;
unsigned int wr_buf_size; /* In bytes */
int wr_fpga_buf_idx;
int wr_host_buf_idx;
int wr_host_buf_pos;
int wr_empty;
int wr_ready; /* Significant only when wr_empty == 1 */
int wr_sleepy;
int wr_eof;
int wr_hangup;
spinlock_t wr_spinlock;
struct mutex wr_mutex;
wait_queue_head_t wr_wait;
wait_queue_head_t wr_ready_wait;
int wr_ref_count;
int wr_synchronous;
int wr_allow_partial;
int wr_exclusive_open;
int wr_supports_nonempty;
struct xilly_buffer **rd_buffers; /* FPGA reads, driver writes! */
int num_rd_buffers;
unsigned int rd_buf_size; /* In bytes */
int rd_fpga_buf_idx;
int rd_host_buf_pos;
int rd_host_buf_idx;
int rd_full;
spinlock_t rd_spinlock;
struct mutex rd_mutex;
wait_queue_head_t rd_wait;
int rd_ref_count;
int rd_allow_partial;
int rd_synchronous;
int rd_exclusive_open;
struct delayed_work rd_workitem;
unsigned char rd_leftovers[4];
};
struct xilly_endpoint {
/*
* One of pdev and dev is always NULL, and the other is a valid
* pointer, depending on the type of device
*/
struct pci_dev *pdev;
struct device *dev;
struct xilly_endpoint_hardware *ephw;
struct list_head ep_list;
int dma_using_dac; /* =1 if 64-bit DMA is used, =0 otherwise. */
__iomem void *registers;
int fatal_error;
struct mutex register_mutex;
wait_queue_head_t ep_wait;
/* Channels and message handling */
struct cdev cdev;
int major;
int lowest_minor; /* Highest minor = lowest_minor + num_channels - 1 */
int num_channels; /* EXCLUDING message buffer */
struct xilly_channel **channels;
int msg_counter;
int failed_messages;
int idtlen;
u32 *msgbuf_addr;
dma_addr_t msgbuf_dma_addr;
unsigned int msg_buf_size;
};
struct xilly_endpoint_hardware {
struct module *owner;
void (*hw_sync_sgl_for_cpu)(struct xilly_endpoint *,
dma_addr_t,
size_t,
int);
void (*hw_sync_sgl_for_device)(struct xilly_endpoint *,
dma_addr_t,
size_t,
int);
int (*map_single)(struct xilly_endpoint *,
void *,
size_t,
int,
dma_addr_t *);
};
struct xilly_mapping {
void *device;
dma_addr_t dma_addr;
size_t size;
int direction;
};
irqreturn_t xillybus_isr(int irq, void *data);
struct xilly_endpoint *xillybus_init_endpoint(struct pci_dev *pdev,
struct device *dev,
struct xilly_endpoint_hardware
*ephw);
int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint);
void xillybus_endpoint_remove(struct xilly_endpoint *endpoint);
#endif /* __XILLYBUS_H */