1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * FPGA Framework
4 *
5 * Copyright (C) 2013-2016 Altera Corporation
6 * Copyright (C) 2017 Intel Corporation
7 */
8 #ifndef _LINUX_FPGA_MGR_H
9 #define _LINUX_FPGA_MGR_H
10
11 #include <linux/mutex.h>
12 #include <linux/platform_device.h>
13
14 struct fpga_manager;
15 struct sg_table;
16
17 /**
18 * enum fpga_mgr_states - fpga framework states
19 * @FPGA_MGR_STATE_UNKNOWN: can't determine state
20 * @FPGA_MGR_STATE_POWER_OFF: FPGA power is off
21 * @FPGA_MGR_STATE_POWER_UP: FPGA reports power is up
22 * @FPGA_MGR_STATE_RESET: FPGA in reset state
23 * @FPGA_MGR_STATE_FIRMWARE_REQ: firmware request in progress
24 * @FPGA_MGR_STATE_FIRMWARE_REQ_ERR: firmware request failed
25 * @FPGA_MGR_STATE_WRITE_INIT: preparing FPGA for programming
26 * @FPGA_MGR_STATE_WRITE_INIT_ERR: Error during WRITE_INIT stage
27 * @FPGA_MGR_STATE_WRITE: writing image to FPGA
28 * @FPGA_MGR_STATE_WRITE_ERR: Error while writing FPGA
29 * @FPGA_MGR_STATE_WRITE_COMPLETE: Doing post programming steps
30 * @FPGA_MGR_STATE_WRITE_COMPLETE_ERR: Error during WRITE_COMPLETE
31 * @FPGA_MGR_STATE_OPERATING: FPGA is programmed and operating
32 */
33 enum fpga_mgr_states {
34 /* default FPGA states */
35 FPGA_MGR_STATE_UNKNOWN,
36 FPGA_MGR_STATE_POWER_OFF,
37 FPGA_MGR_STATE_POWER_UP,
38 FPGA_MGR_STATE_RESET,
39
40 /* getting an image for loading */
41 FPGA_MGR_STATE_FIRMWARE_REQ,
42 FPGA_MGR_STATE_FIRMWARE_REQ_ERR,
43
44 /* write sequence: init, write, complete */
45 FPGA_MGR_STATE_WRITE_INIT,
46 FPGA_MGR_STATE_WRITE_INIT_ERR,
47 FPGA_MGR_STATE_WRITE,
48 FPGA_MGR_STATE_WRITE_ERR,
49 FPGA_MGR_STATE_WRITE_COMPLETE,
50 FPGA_MGR_STATE_WRITE_COMPLETE_ERR,
51
52 /* fpga is programmed and operating */
53 FPGA_MGR_STATE_OPERATING,
54 };
55
56 /**
57 * DOC: FPGA Manager flags
58 *
59 * Flags used in the &fpga_image_info->flags field
60 *
61 * %FPGA_MGR_PARTIAL_RECONFIG: do partial reconfiguration if supported
62 *
63 * %FPGA_MGR_EXTERNAL_CONFIG: FPGA has been configured prior to Linux booting
64 *
65 * %FPGA_MGR_ENCRYPTED_BITSTREAM: indicates bitstream is encrypted
66 *
67 * %FPGA_MGR_BITSTREAM_LSB_FIRST: SPI bitstream bit order is LSB first
68 *
69 * %FPGA_MGR_COMPRESSED_BITSTREAM: FPGA bitstream is compressed
70 */
71 #define FPGA_MGR_PARTIAL_RECONFIG BIT(0)
72 #define FPGA_MGR_EXTERNAL_CONFIG BIT(1)
73 #define FPGA_MGR_ENCRYPTED_BITSTREAM BIT(2)
74 #define FPGA_MGR_BITSTREAM_LSB_FIRST BIT(3)
75 #define FPGA_MGR_COMPRESSED_BITSTREAM BIT(4)
76
77 /**
78 * struct fpga_image_info - information specific to a FPGA image
79 * @flags: boolean flags as defined above
80 * @enable_timeout_us: maximum time to enable traffic through bridge (uSec)
81 * @disable_timeout_us: maximum time to disable traffic through bridge (uSec)
82 * @config_complete_timeout_us: maximum time for FPGA to switch to operating
83 * status in the write_complete op.
84 * @firmware_name: name of FPGA image firmware file
85 * @sgt: scatter/gather table containing FPGA image
86 * @buf: contiguous buffer containing FPGA image
87 * @count: size of buf
88 * @region_id: id of target region
89 * @dev: device that owns this
90 * @overlay: Device Tree overlay
91 */
92 struct fpga_image_info {
93 u32 flags;
94 u32 enable_timeout_us;
95 u32 disable_timeout_us;
96 u32 config_complete_timeout_us;
97 char *firmware_name;
98 struct sg_table *sgt;
99 const char *buf;
100 size_t count;
101 int region_id;
102 struct device *dev;
103 #ifdef CONFIG_OF
104 struct device_node *overlay;
105 #endif
106 };
107
108 /**
109 * struct fpga_manager_ops - ops for low level fpga manager drivers
110 * @initial_header_size: Maximum number of bytes that should be passed into write_init
111 * @state: returns an enum value of the FPGA's state
112 * @status: returns status of the FPGA, including reconfiguration error code
113 * @write_init: prepare the FPGA to receive confuration data
114 * @write: write count bytes of configuration data to the FPGA
115 * @write_sg: write the scatter list of configuration data to the FPGA
116 * @write_complete: set FPGA to operating state after writing is done
117 * @fpga_remove: optional: Set FPGA into a specific state during driver remove
118 * @groups: optional attribute groups.
119 *
120 * fpga_manager_ops are the low level functions implemented by a specific
121 * fpga manager driver. The optional ones are tested for NULL before being
122 * called, so leaving them out is fine.
123 */
124 struct fpga_manager_ops {
125 size_t initial_header_size;
126 enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
127 u64 (*status)(struct fpga_manager *mgr);
128 int (*write_init)(struct fpga_manager *mgr,
129 struct fpga_image_info *info,
130 const char *buf, size_t count);
131 int (*write)(struct fpga_manager *mgr, const char *buf, size_t count);
132 int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
133 int (*write_complete)(struct fpga_manager *mgr,
134 struct fpga_image_info *info);
135 void (*fpga_remove)(struct fpga_manager *mgr);
136 const struct attribute_group **groups;
137 };
138
139 /* FPGA manager status: Partial/Full Reconfiguration errors */
140 #define FPGA_MGR_STATUS_OPERATION_ERR BIT(0)
141 #define FPGA_MGR_STATUS_CRC_ERR BIT(1)
142 #define FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR BIT(2)
143 #define FPGA_MGR_STATUS_IP_PROTOCOL_ERR BIT(3)
144 #define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR BIT(4)
145
146 /**
147 * struct fpga_compat_id - id for compatibility check
148 *
149 * @id_h: high 64bit of the compat_id
150 * @id_l: low 64bit of the compat_id
151 */
152 struct fpga_compat_id {
153 u64 id_h;
154 u64 id_l;
155 };
156
157 /**
158 * struct fpga_manager - fpga manager structure
159 * @name: name of low level fpga manager
160 * @dev: fpga manager device
161 * @ref_mutex: only allows one reference to fpga manager
162 * @state: state of fpga manager
163 * @compat_id: FPGA manager id for compatibility check.
164 * @mops: pointer to struct of fpga manager ops
165 * @priv: low level driver private date
166 */
167 struct fpga_manager {
168 const char *name;
169 struct device dev;
170 struct mutex ref_mutex;
171 enum fpga_mgr_states state;
172 struct fpga_compat_id *compat_id;
173 const struct fpga_manager_ops *mops;
174 void *priv;
175 };
176
177 #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)
178
179 struct fpga_image_info *fpga_image_info_alloc(struct device *dev);
180
181 void fpga_image_info_free(struct fpga_image_info *info);
182
183 int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info);
184
185 int fpga_mgr_lock(struct fpga_manager *mgr);
186 void fpga_mgr_unlock(struct fpga_manager *mgr);
187
188 struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
189
190 struct fpga_manager *fpga_mgr_get(struct device *dev);
191
192 void fpga_mgr_put(struct fpga_manager *mgr);
193
194 struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
195 const struct fpga_manager_ops *mops,
196 void *priv);
197 void fpga_mgr_free(struct fpga_manager *mgr);
198 int fpga_mgr_register(struct fpga_manager *mgr);
199 void fpga_mgr_unregister(struct fpga_manager *mgr);
200
201 struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
202 const struct fpga_manager_ops *mops,
203 void *priv);
204
205 #endif /*_LINUX_FPGA_MGR_H */