include/linux/fpga/fpga-mgr.h

   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  * FPGA Manager flags
  58  * FPGA_MGR_PARTIAL_RECONFIG: do partial reconfiguration if supported
  59  * FPGA_MGR_EXTERNAL_CONFIG: FPGA has been configured prior to Linux booting
  60  * FPGA_MGR_BITSTREAM_LSB_FIRST: SPI bitstream bit order is LSB first
  61  * FPGA_MGR_COMPRESSED_BITSTREAM: FPGA bitstream is compressed
  62  */
  63 #define FPGA_MGR_PARTIAL_RECONFIG       BIT(0)
  64 #define FPGA_MGR_EXTERNAL_CONFIG        BIT(1)
  65 #define FPGA_MGR_ENCRYPTED_BITSTREAM    BIT(2)
  66 #define FPGA_MGR_BITSTREAM_LSB_FIRST    BIT(3)
  67 #define FPGA_MGR_COMPRESSED_BITSTREAM   BIT(4)
  68
  69 /**
  70  * struct fpga_image_info - information specific to a FPGA image
  71  * @flags: boolean flags as defined above
  72  * @enable_timeout_us: maximum time to enable traffic through bridge (uSec)
  73  * @disable_timeout_us: maximum time to disable traffic through bridge (uSec)
  74  * @config_complete_timeout_us: maximum time for FPGA to switch to operating
  75  *         status in the write_complete op.
  76  * @firmware_name: name of FPGA image firmware file
  77  * @sgt: scatter/gather table containing FPGA image
  78  * @buf: contiguous buffer containing FPGA image
  79  * @count: size of buf
  80  * @dev: device that owns this
  81  * @overlay: Device Tree overlay
  82  */
  83 struct fpga_image_info {
  84         u32 flags;
  85         u32 enable_timeout_us;
  86         u32 disable_timeout_us;
  87         u32 config_complete_timeout_us;
  88         char *firmware_name;
  89         struct sg_table *sgt;
  90         const char *buf;
  91         size_t count;
  92         struct device *dev;
  93 #ifdef CONFIG_OF
  94         struct device_node *overlay;
  95 #endif
  96 };
  97
  98 /**
  99  * struct fpga_manager_ops - ops for low level fpga manager drivers
 100  * @initial_header_size: Maximum number of bytes that should be passed into write_init
 101  * @state: returns an enum value of the FPGA's state
 102  * @write_init: prepare the FPGA to receive confuration data
 103  * @write: write count bytes of configuration data to the FPGA
 104  * @write_sg: write the scatter list of configuration data to the FPGA
 105  * @write_complete: set FPGA to operating state after writing is done
 106  * @fpga_remove: optional: Set FPGA into a specific state during driver remove
 107  * @groups: optional attribute groups.
 108  *
 109  * fpga_manager_ops are the low level functions implemented by a specific
 110  * fpga manager driver.  The optional ones are tested for NULL before being
 111  * called, so leaving them out is fine.
 112  */
 113 struct fpga_manager_ops {
 114         size_t initial_header_size;
 115         enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
 116         int (*write_init)(struct fpga_manager *mgr,
 117                           struct fpga_image_info *info,
 118                           const char *buf, size_t count);
 119         int (*write)(struct fpga_manager *mgr, const char *buf, size_t count);
 120         int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
 121         int (*write_complete)(struct fpga_manager *mgr,
 122                               struct fpga_image_info *info);
 123         void (*fpga_remove)(struct fpga_manager *mgr);
 124         const struct attribute_group **groups;
 125 };
 126
 127 /**
 128  * struct fpga_manager - fpga manager structure
 129  * @name: name of low level fpga manager
 130  * @dev: fpga manager device
 131  * @ref_mutex: only allows one reference to fpga manager
 132  * @state: state of fpga manager
 133  * @mops: pointer to struct of fpga manager ops
 134  * @priv: low level driver private date
 135  */
 136 struct fpga_manager {
 137         const char *name;
 138         struct device dev;
 139         struct mutex ref_mutex;
 140         enum fpga_mgr_states state;
 141         const struct fpga_manager_ops *mops;
 142         void *priv;
 143 };
 144
 145 #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)
 146
 147 struct fpga_image_info *fpga_image_info_alloc(struct device *dev);
 148
 149 void fpga_image_info_free(struct fpga_image_info *info);
 150
 151 int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info);
 152
 153 int fpga_mgr_lock(struct fpga_manager *mgr);
 154 void fpga_mgr_unlock(struct fpga_manager *mgr);
 155
 156 struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
 157
 158 struct fpga_manager *fpga_mgr_get(struct device *dev);
 159
 160 void fpga_mgr_put(struct fpga_manager *mgr);
 161
 162 struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
 163                                      const struct fpga_manager_ops *mops,
 164                                      void *priv);
 165 void fpga_mgr_free(struct fpga_manager *mgr);
 166 int fpga_mgr_register(struct fpga_manager *mgr);
 167 void fpga_mgr_unregister(struct fpga_manager *mgr);
 168
 169 #endif /*_LINUX_FPGA_MGR_H */