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_PARSE_HEADER: parse FPGA image header
26  * @FPGA_MGR_STATE_PARSE_HEADER_ERR: Error during PARSE_HEADER stage
27  * @FPGA_MGR_STATE_WRITE_INIT: preparing FPGA for programming
28  * @FPGA_MGR_STATE_WRITE_INIT_ERR: Error during WRITE_INIT stage
29  * @FPGA_MGR_STATE_WRITE: writing image to FPGA
30  * @FPGA_MGR_STATE_WRITE_ERR: Error while writing FPGA
31  * @FPGA_MGR_STATE_WRITE_COMPLETE: Doing post programming steps
32  * @FPGA_MGR_STATE_WRITE_COMPLETE_ERR: Error during WRITE_COMPLETE
33  * @FPGA_MGR_STATE_OPERATING: FPGA is programmed and operating
34  */
35 enum fpga_mgr_states {
36 	/* default FPGA states */
37 	FPGA_MGR_STATE_UNKNOWN,
38 	FPGA_MGR_STATE_POWER_OFF,
39 	FPGA_MGR_STATE_POWER_UP,
40 	FPGA_MGR_STATE_RESET,
41 
42 	/* getting an image for loading */
43 	FPGA_MGR_STATE_FIRMWARE_REQ,
44 	FPGA_MGR_STATE_FIRMWARE_REQ_ERR,
45 
46 	/* write sequence: parse header, init, write, complete */
47 	FPGA_MGR_STATE_PARSE_HEADER,
48 	FPGA_MGR_STATE_PARSE_HEADER_ERR,
49 	FPGA_MGR_STATE_WRITE_INIT,
50 	FPGA_MGR_STATE_WRITE_INIT_ERR,
51 	FPGA_MGR_STATE_WRITE,
52 	FPGA_MGR_STATE_WRITE_ERR,
53 	FPGA_MGR_STATE_WRITE_COMPLETE,
54 	FPGA_MGR_STATE_WRITE_COMPLETE_ERR,
55 
56 	/* fpga is programmed and operating */
57 	FPGA_MGR_STATE_OPERATING,
58 };
59 
60 /**
61  * DOC: FPGA Manager flags
62  *
63  * Flags used in the &fpga_image_info->flags field
64  *
65  * %FPGA_MGR_PARTIAL_RECONFIG: do partial reconfiguration if supported
66  *
67  * %FPGA_MGR_EXTERNAL_CONFIG: FPGA has been configured prior to Linux booting
68  *
69  * %FPGA_MGR_ENCRYPTED_BITSTREAM: indicates bitstream is encrypted
70  *
71  * %FPGA_MGR_BITSTREAM_LSB_FIRST: SPI bitstream bit order is LSB first
72  *
73  * %FPGA_MGR_COMPRESSED_BITSTREAM: FPGA bitstream is compressed
74  */
75 #define FPGA_MGR_PARTIAL_RECONFIG	BIT(0)
76 #define FPGA_MGR_EXTERNAL_CONFIG	BIT(1)
77 #define FPGA_MGR_ENCRYPTED_BITSTREAM	BIT(2)
78 #define FPGA_MGR_BITSTREAM_LSB_FIRST	BIT(3)
79 #define FPGA_MGR_COMPRESSED_BITSTREAM	BIT(4)
80 
81 /**
82  * struct fpga_image_info - information specific to an FPGA image
83  * @flags: boolean flags as defined above
84  * @enable_timeout_us: maximum time to enable traffic through bridge (uSec)
85  * @disable_timeout_us: maximum time to disable traffic through bridge (uSec)
86  * @config_complete_timeout_us: maximum time for FPGA to switch to operating
87  *	   status in the write_complete op.
88  * @firmware_name: name of FPGA image firmware file
89  * @sgt: scatter/gather table containing FPGA image
90  * @buf: contiguous buffer containing FPGA image
91  * @count: size of buf
92  * @header_size: size of image header.
93  * @data_size: size of image data to be sent to the device. If not specified,
94  *	whole image will be used. Header may be skipped in either case.
95  * @region_id: id of target region
96  * @dev: device that owns this
97  * @overlay: Device Tree overlay
98  */
99 struct fpga_image_info {
100 	u32 flags;
101 	u32 enable_timeout_us;
102 	u32 disable_timeout_us;
103 	u32 config_complete_timeout_us;
104 	char *firmware_name;
105 	struct sg_table *sgt;
106 	const char *buf;
107 	size_t count;
108 	size_t header_size;
109 	size_t data_size;
110 	int region_id;
111 	struct device *dev;
112 #ifdef CONFIG_OF
113 	struct device_node *overlay;
114 #endif
115 };
116 
117 /**
118  * struct fpga_compat_id - id for compatibility check
119  *
120  * @id_h: high 64bit of the compat_id
121  * @id_l: low 64bit of the compat_id
122  */
123 struct fpga_compat_id {
124 	u64 id_h;
125 	u64 id_l;
126 };
127 
128 /**
129  * struct fpga_manager_info - collection of parameters for an FPGA Manager
130  * @name: fpga manager name
131  * @compat_id: FPGA manager id for compatibility check.
132  * @mops: pointer to structure of fpga manager ops
133  * @priv: fpga manager private data
134  *
135  * fpga_manager_info contains parameters for the register_full function.
136  * These are separated into an info structure because they some are optional
137  * others could be added to in the future. The info structure facilitates
138  * maintaining a stable API.
139  */
140 struct fpga_manager_info {
141 	const char *name;
142 	struct fpga_compat_id *compat_id;
143 	const struct fpga_manager_ops *mops;
144 	void *priv;
145 };
146 
147 /**
148  * struct fpga_manager_ops - ops for low level fpga manager drivers
149  * @initial_header_size: minimum number of bytes that should be passed into
150  *	parse_header and write_init.
151  * @skip_header: bool flag to tell fpga-mgr core whether it should skip
152  *	info->header_size part at the beginning of the image when invoking
153  *	write callback.
154  * @state: returns an enum value of the FPGA's state
155  * @status: returns status of the FPGA, including reconfiguration error code
156  * @parse_header: parse FPGA image header to set info->header_size and
157  *	info->data_size. In case the input buffer is not large enough, set
158  *	required size to info->header_size and return -EAGAIN.
159  * @write_init: prepare the FPGA to receive configuration data
160  * @write: write count bytes of configuration data to the FPGA
161  * @write_sg: write the scatter list of configuration data to the FPGA
162  * @write_complete: set FPGA to operating state after writing is done
163  * @fpga_remove: optional: Set FPGA into a specific state during driver remove
164  * @groups: optional attribute groups.
165  *
166  * fpga_manager_ops are the low level functions implemented by a specific
167  * fpga manager driver.  The optional ones are tested for NULL before being
168  * called, so leaving them out is fine.
169  */
170 struct fpga_manager_ops {
171 	size_t initial_header_size;
172 	bool skip_header;
173 	enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
174 	u64 (*status)(struct fpga_manager *mgr);
175 	int (*parse_header)(struct fpga_manager *mgr,
176 			    struct fpga_image_info *info,
177 			    const char *buf, size_t count);
178 	int (*write_init)(struct fpga_manager *mgr,
179 			  struct fpga_image_info *info,
180 			  const char *buf, size_t count);
181 	int (*write)(struct fpga_manager *mgr, const char *buf, size_t count);
182 	int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
183 	int (*write_complete)(struct fpga_manager *mgr,
184 			      struct fpga_image_info *info);
185 	void (*fpga_remove)(struct fpga_manager *mgr);
186 	const struct attribute_group **groups;
187 };
188 
189 /* FPGA manager status: Partial/Full Reconfiguration errors */
190 #define FPGA_MGR_STATUS_OPERATION_ERR		BIT(0)
191 #define FPGA_MGR_STATUS_CRC_ERR			BIT(1)
192 #define FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR	BIT(2)
193 #define FPGA_MGR_STATUS_IP_PROTOCOL_ERR		BIT(3)
194 #define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR	BIT(4)
195 
196 /**
197  * struct fpga_manager - fpga manager structure
198  * @name: name of low level fpga manager
199  * @dev: fpga manager device
200  * @ref_mutex: only allows one reference to fpga manager
201  * @state: state of fpga manager
202  * @compat_id: FPGA manager id for compatibility check.
203  * @mops: pointer to struct of fpga manager ops
204  * @priv: low level driver private date
205  */
206 struct fpga_manager {
207 	const char *name;
208 	struct device dev;
209 	struct mutex ref_mutex;
210 	enum fpga_mgr_states state;
211 	struct fpga_compat_id *compat_id;
212 	const struct fpga_manager_ops *mops;
213 	void *priv;
214 };
215 
216 #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)
217 
218 struct fpga_image_info *fpga_image_info_alloc(struct device *dev);
219 
220 void fpga_image_info_free(struct fpga_image_info *info);
221 
222 int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info);
223 
224 int fpga_mgr_lock(struct fpga_manager *mgr);
225 void fpga_mgr_unlock(struct fpga_manager *mgr);
226 
227 struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
228 
229 struct fpga_manager *fpga_mgr_get(struct device *dev);
230 
231 void fpga_mgr_put(struct fpga_manager *mgr);
232 
233 struct fpga_manager *
234 fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *info);
235 
236 struct fpga_manager *
237 fpga_mgr_register(struct device *parent, const char *name,
238 		  const struct fpga_manager_ops *mops, void *priv);
239 void fpga_mgr_unregister(struct fpga_manager *mgr);
240 
241 struct fpga_manager *
242 devm_fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *info);
243 struct fpga_manager *
244 devm_fpga_mgr_register(struct device *parent, const char *name,
245 		       const struct fpga_manager_ops *mops, void *priv);
246 
247 #endif /*_LINUX_FPGA_MGR_H */
248