Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / char / xillybus / xillybus.h
1 /*
2  * linux/drivers/misc/xillybus.h
3  *
4  * Copyright 2011 Xillybus Ltd, http://xillybus.com
5  *
6  * Header file for the Xillybus FPGA/host framework.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the smems of the GNU General Public License as published by
10  * the Free Software Foundation; version 2 of the License.
11  */
12
13 #ifndef __XILLYBUS_H
14 #define __XILLYBUS_H
15
16 #include <linux/list.h>
17 #include <linux/device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/interrupt.h>
20 #include <linux/sched.h>
21 #include <linux/cdev.h>
22 #include <linux/spinlock.h>
23 #include <linux/mutex.h>
24 #include <linux/workqueue.h>
25
26 struct xilly_endpoint_hardware;
27
28 struct xilly_buffer {
29         void *addr;
30         dma_addr_t dma_addr;
31         int end_offset; /* Counting elements, not bytes */
32 };
33
34 struct xilly_idt_handle {
35         unsigned char *chandesc;
36         unsigned char *idt;
37         int entries;
38 };
39
40 /*
41  * Read-write confusion: wr_* and rd_* notation sticks to FPGA view, so
42  * wr_* buffers are those consumed by read(), since the FPGA writes to them
43  * and vice versa.
44  */
45
46 struct xilly_channel {
47         struct xilly_endpoint *endpoint;
48         int chan_num;
49         int log2_element_size;
50         int seekable;
51
52         struct xilly_buffer **wr_buffers; /* FPGA writes, driver reads! */
53         int num_wr_buffers;
54         unsigned int wr_buf_size; /* In bytes */
55         int wr_fpga_buf_idx;
56         int wr_host_buf_idx;
57         int wr_host_buf_pos;
58         int wr_empty;
59         int wr_ready; /* Significant only when wr_empty == 1 */
60         int wr_sleepy;
61         int wr_eof;
62         int wr_hangup;
63         spinlock_t wr_spinlock;
64         struct mutex wr_mutex;
65         wait_queue_head_t wr_wait;
66         wait_queue_head_t wr_ready_wait;
67         int wr_ref_count;
68         int wr_synchronous;
69         int wr_allow_partial;
70         int wr_exclusive_open;
71         int wr_supports_nonempty;
72
73         struct xilly_buffer **rd_buffers; /* FPGA reads, driver writes! */
74         int num_rd_buffers;
75         unsigned int rd_buf_size; /* In bytes */
76         int rd_fpga_buf_idx;
77         int rd_host_buf_pos;
78         int rd_host_buf_idx;
79         int rd_full;
80         spinlock_t rd_spinlock;
81         struct mutex rd_mutex;
82         wait_queue_head_t rd_wait;
83         int rd_ref_count;
84         int rd_allow_partial;
85         int rd_synchronous;
86         int rd_exclusive_open;
87         struct delayed_work rd_workitem;
88         unsigned char rd_leftovers[4];
89 };
90
91 struct xilly_endpoint {
92         /*
93          * One of pdev and dev is always NULL, and the other is a valid
94          * pointer, depending on the type of device
95          */
96         struct pci_dev *pdev;
97         struct device *dev;
98         struct xilly_endpoint_hardware *ephw;
99
100         struct list_head ep_list;
101         int dma_using_dac; /* =1 if 64-bit DMA is used, =0 otherwise. */
102         __iomem void *registers;
103         int fatal_error;
104
105         struct mutex register_mutex;
106         wait_queue_head_t ep_wait;
107
108         /* Channels and message handling */
109         struct cdev cdev;
110
111         int major;
112         int lowest_minor; /* Highest minor = lowest_minor + num_channels - 1 */
113
114         int num_channels; /* EXCLUDING message buffer */
115         struct xilly_channel **channels;
116         int msg_counter;
117         int failed_messages;
118         int idtlen;
119
120         u32 *msgbuf_addr;
121         dma_addr_t msgbuf_dma_addr;
122         unsigned int msg_buf_size;
123 };
124
125 struct xilly_endpoint_hardware {
126         struct module *owner;
127         void (*hw_sync_sgl_for_cpu)(struct xilly_endpoint *,
128                                     dma_addr_t,
129                                     size_t,
130                                     int);
131         void (*hw_sync_sgl_for_device)(struct xilly_endpoint *,
132                                        dma_addr_t,
133                                        size_t,
134                                        int);
135         int (*map_single)(struct xilly_endpoint *,
136                           void *,
137                           size_t,
138                           int,
139                           dma_addr_t *);
140 };
141
142 struct xilly_mapping {
143         void *device;
144         dma_addr_t dma_addr;
145         size_t size;
146         int direction;
147 };
148
149 irqreturn_t xillybus_isr(int irq, void *data);
150
151 struct xilly_endpoint *xillybus_init_endpoint(struct pci_dev *pdev,
152                                               struct device *dev,
153                                               struct xilly_endpoint_hardware
154                                               *ephw);
155
156 int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint);
157
158 void xillybus_endpoint_remove(struct xilly_endpoint *endpoint);
159
160 #endif /* __XILLYBUS_H */