src/flash/nor/driver.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath <Dominic.Rath@gmx.de>              *
   3  *   Copyright (C) 2007,2008 Øyvind Harboe <oyvind.harboe@zylin.com>       *
   4  *   Copyright (C) 2008 by Spencer Oliver <spen@spen-soft.co.uk>           *
   5  *   Copyright (C) 2009 Zachary T Welch <zw@superlucidity.net>             *
   6  *   Copyright (C) 2010 by Antonio Borneo <borneo.antonio@gmail.com>       *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  20  ***************************************************************************/
  21
  22 #ifndef FLASH_NOR_DRIVER_H
  23 #define FLASH_NOR_DRIVER_H
  24
  25 struct flash_bank;
  26
  27 #define __FLASH_BANK_COMMAND(name) \
  28                 COMMAND_HELPER(name, struct flash_bank *bank)
  29
  30 /**
  31  * @brief Provides the implementation-independent structure that defines
  32  * all of the callbacks required by OpenOCD flash drivers.
  33  *
  34  * Driver authors must implement the routines defined here, providing an
  35  * instance with the fields filled out.  After that, the instance must
  36  * be registered in flash.c, so it can be used by the driver lookup system.
  37  *
  38  * Specifically, the user can issue the command: @par
  39  * @code
  40  * flash bank DRIVERNAME ...parameters...
  41  * @endcode
  42  *
  43  * OpenOCD will search for the driver with a @c flash_driver_s::name
  44  * that matches @c DRIVERNAME.
  45  *
  46  * The flash subsystem calls some of the other drivers routines a using
  47  * corresponding static <code>flash_driver_<i>callback</i>()</code>
  48  * routine in flash.c.
  49  */
  50 struct flash_driver {
  51         /**
  52          * Gives a human-readable name of this flash driver,
  53          * This field is used to select and initialize the driver.
  54          */
  55         const char *name;
  56
  57         /**
  58          * Gives a human-readable description of arguments.
  59          */
  60         const char *usage;
  61
  62         /**
  63          * An array of driver-specific commands to register.  When called
  64          * during the "flash bank" command, the driver can register addition
  65          * commands to support new flash chip functions.
  66          */
  67         const struct command_registration *commands;
  68
  69         /**
  70          * Finish the "flash bank" command for @a bank.  The
  71          * @a bank parameter will have been filled in by the core flash
  72          * layer when this routine is called, and the driver can store
  73          * additional information in its struct flash_bank::driver_priv field.
  74          *
  75          * The CMD_ARGV are: @par
  76          * @code
  77          * CMD_ARGV[0] = bank
  78          * CMD_ARGV[1] = drivername {name above}
  79          * CMD_ARGV[2] = baseaddress
  80          * CMD_ARGV[3] = lengthbytes
  81          * CMD_ARGV[4] = chip_width_in bytes
  82          * CMD_ARGV[5] = bus_width_in_bytes
  83          * CMD_ARGV[6] = driver-specific parameters
  84          * @endcode
  85          *
  86          * For example, CMD_ARGV[4] = 2 (for 16 bit flash),
  87          *      CMD_ARGV[5] = 4 (for 32 bit bus).
  88          *
  89          * If extra arguments are provided (@a CMD_ARGC > 6), they will
  90          * start in @a CMD_ARGV[6].  These can be used to implement
  91          * driver-specific extensions.
  92          *
  93          * @returns ERROR_OK if successful; otherwise, an error code.
  94          */
  95         __FLASH_BANK_COMMAND((*flash_bank_command));
  96
  97         /**
  98          * Bank/sector erase routine (target-specific).  When
  99          * called, the flash driver should erase the specified sectors
 100          * using whatever means are at its disposal.
 101          *
 102          * @param bank The bank of flash to be erased.
 103          * @param first The number of the first sector to erase, typically 0.
 104          * @param last The number of the last sector to erase, typically N-1.
 105          * @returns ERROR_OK if successful; otherwise, an error code.
 106          */
 107         int (*erase)(struct flash_bank *bank, int first, int last);
 108
 109         /**
 110          * Bank/sector protection routine (target-specific).
 111          *
 112          * When called, the driver should enable/disable protection
 113          * for MINIMUM the range covered by first..last sectors
 114          * inclusive. Some chips have alignment requirements will
 115          * cause the actual range to be protected / unprotected to
 116          * be larger than the first..last range.
 117          *
 118          * @param bank The bank to protect or unprotect.
 119          * @param set If non-zero, enable protection; if 0, disable it.
 120          * @param first The first sector to (un)protect, typicaly 0.
 121          * @param last The last sector to (un)project, typically N-1.
 122          * @returns ERROR_OK if successful; otherwise, an error code.
 123          */
 124         int (*protect)(struct flash_bank *bank, int set, int first, int last);
 125
 126         /**
 127          * Program data into the flash.  Note CPU address will be
 128          * "bank->base + offset", while the physical address is
 129          * dependent upon current target MMU mappings.
 130          *
 131          * @param bank The bank to program
 132          * @param buffer The data bytes to write.
 133          * @param offset The offset into the chip to program.
 134          * @param count The number of bytes to write.
 135          * @returns ERROR_OK if successful; otherwise, an error code.
 136          */
 137         int (*write)(struct flash_bank *bank,
 138                         const uint8_t *buffer, uint32_t offset, uint32_t count);
 139
 140         /**
 141          * Read data from the flash. Note CPU address will be
 142          * "bank->base + offset", while the physical address is
 143          * dependent upon current target MMU mappings.
 144          *
 145          * @param bank The bank to read.
 146          * @param buffer The data bytes read.
 147          * @param offset The offset into the chip to read.
 148          * @param count The number of bytes to read.
 149          * @returns ERROR_OK if successful; otherwise, an error code.
 150          */
 151          int (*read)(struct flash_bank *bank,
 152                         uint8_t *buffer, uint32_t offset, uint32_t count);
 153
 154         /**
 155          * Probe to determine what kind of flash is present.
 156          * This is invoked by the "probe" script command.
 157          *
 158          * @param bank The bank to probe
 159          * @returns ERROR_OK if successful; otherwise, an error code.
 160          */
 161         int (*probe)(struct flash_bank *bank);
 162
 163         /**
 164          * Check the erasure status of a flash bank.
 165          * When called, the driver routine must perform the required
 166          * checks and then set the @c flash_sector_s::is_erased field
 167          * for each of the flash banks's sectors.
 168          *
 169          * @param bank The bank to check
 170          * @returns ERROR_OK if successful; otherwise, an error code.
 171          */
 172         int (*erase_check)(struct flash_bank *bank);
 173
 174         /**
 175          * Determine if the specific bank is "protected" or not.
 176          * When called, the driver routine must must perform the
 177          * required protection check(s) and then set the @c
 178          * flash_sector_s::is_protected field for each of the flash
 179          * bank's sectors.
 180          *
 181          * @param bank - the bank to check
 182          * @returns ERROR_OK if successful; otherwise, an error code.
 183          */
 184         int (*protect_check)(struct flash_bank *bank);
 185
 186         /**
 187          * Display human-readable information about the flash
 188          * bank into the given buffer.  Drivers must be careful to avoid
 189          * overflowing the buffer.
 190          *
 191          * @param bank - the bank to get info about
 192          * @param char - where to put the text for the human to read
 193          * @param buf_size - the size of the human buffer.
 194          * @returns ERROR_OK if successful; otherwise, an error code.
 195          */
 196         int (*info)(struct flash_bank *bank, char *buf, int buf_size);
 197
 198         /**
 199          * A more gentle flavor of filash_driver_s::probe, performing
 200          * setup with less noise.  Generally, driver routines should test
 201          * to see if the bank has already been probed; if it has, the
 202          * driver probably should not perform its probe a second time.
 203          *
 204          * This callback is often called from the inside of other
 205          * routines (e.g. GDB flash downloads) to autoprobe the flash as
 206          * it is programing the flash.
 207          *
 208          * @param bank - the bank to probe
 209          * @returns ERROR_OK if successful; otherwise, an error code.
 210          */
 211         int (*auto_probe)(struct flash_bank *bank);
 212 };
 213
 214 #define FLASH_BANK_COMMAND_HANDLER(name) \
 215         static __FLASH_BANK_COMMAND(name)
 216
 217 /**
 218  * Find a NOR flash driver by its name.
 219  * @param name The name of the requested driver.
 220  * @returns The flash_driver called @c name, or NULL if not found.
 221  */
 222 struct flash_driver *flash_driver_find_by_name(const char *name);
 223
 224 #endif /* FLASH_NOR_DRIVER_H */