include/linux/fpga/fpga-mgr.h

   1 /*
   2  * FPGA Framework
   3  *
   4  *  Copyright (C) 2013-2015 Altera Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 #include <linux/mutex.h>
  19 #include <linux/platform_device.h>
  20
  21 #ifndef _LINUX_FPGA_MGR_H
  22 #define _LINUX_FPGA_MGR_H
  23
  24 struct fpga_manager;
  25 struct sg_table;
  26
  27 /**
  28  * enum fpga_mgr_states - fpga framework states
  29  * @FPGA_MGR_STATE_UNKNOWN: can't determine state
  30  * @FPGA_MGR_STATE_POWER_OFF: FPGA power is off
  31  * @FPGA_MGR_STATE_POWER_UP: FPGA reports power is up
  32  * @FPGA_MGR_STATE_RESET: FPGA in reset state
  33  * @FPGA_MGR_STATE_FIRMWARE_REQ: firmware request in progress
  34  * @FPGA_MGR_STATE_FIRMWARE_REQ_ERR: firmware request failed
  35  * @FPGA_MGR_STATE_WRITE_INIT: preparing FPGA for programming
  36  * @FPGA_MGR_STATE_WRITE_INIT_ERR: Error during WRITE_INIT stage
  37  * @FPGA_MGR_STATE_WRITE: writing image to FPGA
  38  * @FPGA_MGR_STATE_WRITE_ERR: Error while writing FPGA
  39  * @FPGA_MGR_STATE_WRITE_COMPLETE: Doing post programming steps
  40  * @FPGA_MGR_STATE_WRITE_COMPLETE_ERR: Error during WRITE_COMPLETE
  41  * @FPGA_MGR_STATE_OPERATING: FPGA is programmed and operating
  42  */
  43 enum fpga_mgr_states {
  44         /* default FPGA states */
  45         FPGA_MGR_STATE_UNKNOWN,
  46         FPGA_MGR_STATE_POWER_OFF,
  47         FPGA_MGR_STATE_POWER_UP,
  48         FPGA_MGR_STATE_RESET,
  49
  50         /* getting an image for loading */
  51         FPGA_MGR_STATE_FIRMWARE_REQ,
  52         FPGA_MGR_STATE_FIRMWARE_REQ_ERR,
  53
  54         /* write sequence: init, write, complete */
  55         FPGA_MGR_STATE_WRITE_INIT,
  56         FPGA_MGR_STATE_WRITE_INIT_ERR,
  57         FPGA_MGR_STATE_WRITE,
  58         FPGA_MGR_STATE_WRITE_ERR,
  59         FPGA_MGR_STATE_WRITE_COMPLETE,
  60         FPGA_MGR_STATE_WRITE_COMPLETE_ERR,
  61
  62         /* fpga is programmed and operating */
  63         FPGA_MGR_STATE_OPERATING,
  64 };
  65
  66 /*
  67  * FPGA Manager flags
  68  * FPGA_MGR_PARTIAL_RECONFIG: do partial reconfiguration if supported
  69  * FPGA_MGR_EXTERNAL_CONFIG: FPGA has been configured prior to Linux booting
  70  */
  71 #define FPGA_MGR_PARTIAL_RECONFIG       BIT(0)
  72 #define FPGA_MGR_EXTERNAL_CONFIG        BIT(1)
  73
  74 /**
  75  * struct fpga_image_info - information specific to a FPGA image
  76  * @flags: boolean flags as defined above
  77  * @enable_timeout_us: maximum time to enable traffic through bridge (uSec)
  78  * @disable_timeout_us: maximum time to disable traffic through bridge (uSec)
  79  */
  80 struct fpga_image_info {
  81         u32 flags;
  82         u32 enable_timeout_us;
  83         u32 disable_timeout_us;
  84 };
  85
  86 /**
  87  * struct fpga_manager_ops - ops for low level fpga manager drivers
  88  * @initial_header_size: Maximum number of bytes that should be passed into write_init
  89  * @state: returns an enum value of the FPGA's state
  90  * @write_init: prepare the FPGA to receive confuration data
  91  * @write: write count bytes of configuration data to the FPGA
  92  * @write_sg: write the scatter list of configuration data to the FPGA
  93  * @write_complete: set FPGA to operating state after writing is done
  94  * @fpga_remove: optional: Set FPGA into a specific state during driver remove
  95  *
  96  * fpga_manager_ops are the low level functions implemented by a specific
  97  * fpga manager driver.  The optional ones are tested for NULL before being
  98  * called, so leaving them out is fine.
  99  */
 100 struct fpga_manager_ops {
 101         size_t initial_header_size;
 102         enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
 103         int (*write_init)(struct fpga_manager *mgr,
 104                           struct fpga_image_info *info,
 105                           const char *buf, size_t count);
 106         int (*write)(struct fpga_manager *mgr, const char *buf, size_t count);
 107         int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
 108         int (*write_complete)(struct fpga_manager *mgr,
 109                               struct fpga_image_info *info);
 110         void (*fpga_remove)(struct fpga_manager *mgr);
 111 };
 112
 113 /**
 114  * struct fpga_manager - fpga manager structure
 115  * @name: name of low level fpga manager
 116  * @dev: fpga manager device
 117  * @ref_mutex: only allows one reference to fpga manager
 118  * @state: state of fpga manager
 119  * @mops: pointer to struct of fpga manager ops
 120  * @priv: low level driver private date
 121  */
 122 struct fpga_manager {
 123         const char *name;
 124         struct device dev;
 125         struct mutex ref_mutex;
 126         enum fpga_mgr_states state;
 127         const struct fpga_manager_ops *mops;
 128         void *priv;
 129 };
 130
 131 #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)
 132
 133 int fpga_mgr_buf_load(struct fpga_manager *mgr, struct fpga_image_info *info,
 134                       const char *buf, size_t count);
 135 int fpga_mgr_buf_load_sg(struct fpga_manager *mgr, struct fpga_image_info *info,
 136                          struct sg_table *sgt);
 137
 138 int fpga_mgr_firmware_load(struct fpga_manager *mgr,
 139                            struct fpga_image_info *info,
 140                            const char *image_name);
 141
 142 struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
 143
 144 struct fpga_manager *fpga_mgr_get(struct device *dev);
 145
 146 void fpga_mgr_put(struct fpga_manager *mgr);
 147
 148 int fpga_mgr_register(struct device *dev, const char *name,
 149                       const struct fpga_manager_ops *mops, void *priv);
 150
 151 void fpga_mgr_unregister(struct device *dev);
 152
 153 #endif /*_LINUX_FPGA_MGR_H */