1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/drivers/misc/xillybus.h
5 * Copyright 2011 Xillybus Ltd, http://xillybus.com
7 * Header file for the Xillybus FPGA/host framework.
13 #include <linux/list.h>
14 #include <linux/device.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/interrupt.h>
17 #include <linux/sched.h>
18 #include <linux/cdev.h>
19 #include <linux/spinlock.h>
20 #include <linux/mutex.h>
21 #include <linux/workqueue.h>
23 struct xilly_endpoint_hardware;
28 int end_offset; /* Counting elements, not bytes */
31 struct xilly_idt_handle {
32 unsigned char *chandesc;
39 * Read-write confusion: wr_* and rd_* notation sticks to FPGA view, so
40 * wr_* buffers are those consumed by read(), since the FPGA writes to them
44 struct xilly_channel {
45 struct xilly_endpoint *endpoint;
47 int log2_element_size;
50 struct xilly_buffer **wr_buffers; /* FPGA writes, driver reads! */
52 unsigned int wr_buf_size; /* In bytes */
57 int wr_ready; /* Significant only when wr_empty == 1 */
61 spinlock_t wr_spinlock;
62 struct mutex wr_mutex;
63 wait_queue_head_t wr_wait;
64 wait_queue_head_t wr_ready_wait;
68 int wr_exclusive_open;
69 int wr_supports_nonempty;
71 struct xilly_buffer **rd_buffers; /* FPGA reads, driver writes! */
73 unsigned int rd_buf_size; /* In bytes */
78 spinlock_t rd_spinlock;
79 struct mutex rd_mutex;
80 wait_queue_head_t rd_wait;
84 int rd_exclusive_open;
85 struct delayed_work rd_workitem;
86 unsigned char rd_leftovers[4];
89 struct xilly_endpoint {
93 int dma_using_dac; /* =1 if 64-bit DMA is used, =0 otherwise. */
94 __iomem void *registers;
97 struct mutex register_mutex;
98 wait_queue_head_t ep_wait;
100 int num_channels; /* EXCLUDING message buffer */
101 struct xilly_channel **channels;
107 dma_addr_t msgbuf_dma_addr;
108 unsigned int msg_buf_size;
111 struct xilly_mapping {
112 struct device *device;
118 irqreturn_t xillybus_isr(int irq, void *data);
120 struct xilly_endpoint *xillybus_init_endpoint(struct device *dev);
122 int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint);
124 void xillybus_endpoint_remove(struct xilly_endpoint *endpoint);
126 #endif /* __XILLYBUS_H */