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, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23
  24 #ifndef FLASH_NOR_DRIVER_H
  25 #define FLASH_NOR_DRIVER_H
  26
  27 struct flash_bank;
  28
  29 #define __FLASH_BANK_COMMAND(name) \
  30                 COMMAND_HELPER(name, struct flash_bank *bank)
  31
  32 /**
  33  * @brief Provides the implementation-independent structure that defines
  34  * all of the callbacks required by OpenOCD flash drivers.
  35  *
  36  * Driver authors must implement the routines defined here, providing an
  37  * instance with the fields filled out.  After that, the instance must
  38  * be registered in flash.c, so it can be used by the driver lookup system.
  39  *
  40  * Specifically, the user can issue the command: @par
  41  * @code
  42  * flash bank DRIVERNAME ...parameters...
  43  * @endcode
  44  *
  45  * OpenOCD will search for the driver with a @c flash_driver_s::name
  46  * that matches @c DRIVERNAME.
  47  *
  48  * The flash subsystem calls some of the other drivers routines a using
  49  * corresponding static <code>flash_driver_<i>callback</i>()</code>
  50  * routine in flash.c.
  51  */
  52 struct flash_driver {
  53         /**
  54          * Gives a human-readable name of this flash driver,
  55          * This field is used to select and initialize the driver.
  56          */
  57         const char *name;
  58
  59         /**
  60          * Gives a human-readable description of arguments.
  61          */
  62         const char *usage;
  63
  64         /**
  65          * An array of driver-specific commands to register.  When called
  66          * during the "flash bank" command, the driver can register addition
  67          * commands to support new flash chip functions.
  68          */
  69         const struct command_registration *commands;
  70
  71         /**
  72          * Finish the "flash bank" command for @a bank.  The
  73          * @a bank parameter will have been filled in by the core flash
  74          * layer when this routine is called, and the driver can store
  75          * additional information in its struct flash_bank::driver_priv field.
  76          *
  77          * The CMD_ARGV are: @par
  78          * @code
  79          * CMD_ARGV[0] = bank
  80          * CMD_ARGV[1] = drivername {name above}
  81          * CMD_ARGV[2] = baseaddress
  82          * CMD_ARGV[3] = lengthbytes
  83          * CMD_ARGV[4] = chip_width_in bytes
  84          * CMD_ARGV[5] = bus_width_in_bytes
  85          * CMD_ARGV[6] = driver-specific parameters
  86          * @endcode
  87          *
  88          * For example, CMD_ARGV[4] = 2 (for 16 bit flash),
  89          *      CMD_ARGV[5] = 4 (for 32 bit bus).
  90          *
  91          * If extra arguments are provided (@a CMD_ARGC > 6), they will
  92          * start in @a CMD_ARGV[6].  These can be used to implement
  93          * driver-specific extensions.
  94          *
  95          * @returns ERROR_OK if successful; otherwise, an error code.
  96          */
  97         __FLASH_BANK_COMMAND((*flash_bank_command));
  98
  99         /**
 100          * Bank/sector erase routine (target-specific).  When
 101          * called, the flash driver should erase the specified sectors
 102          * using whatever means are at its disposal.
 103          *
 104          * @param bank The bank of flash to be erased.
 105          * @param first The number of the first sector to erase, typically 0.
 106          * @param last The number of the last sector to erase, typically N-1.
 107          * @returns ERROR_OK if successful; otherwise, an error code.
 108          */
 109         int (*erase)(struct flash_bank *bank, int first, int last);
 110
 111         /**
 112          * Bank/sector protection routine (target-specific).
 113          *
 114          * When called, the driver should enable/disable protection
 115          * for MINIMUM the range covered by first..last sectors
 116          * inclusive. Some chips have alignment requirements will
 117          * cause the actual range to be protected / unprotected to
 118          * be larger than the first..last range.
 119          *
 120          * @param bank The bank to protect or unprotect.
 121          * @param set If non-zero, enable protection; if 0, disable it.
 122          * @param first The first sector to (un)protect, typicaly 0.
 123          * @param last The last sector to (un)project, typically N-1.
 124          * @returns ERROR_OK if successful; otherwise, an error code.
 125          */
 126         int (*protect)(struct flash_bank *bank, int set, int first, int last);
 127
 128         /**
 129          * Program data into the flash.  Note CPU address will be
 130          * "bank->base + offset", while the physical address is
 131          * dependent upon current target MMU mappings.
 132          *
 133          * @param bank The bank to program
 134          * @param buffer The data bytes to write.
 135          * @param offset The offset into the chip to program.
 136          * @param count The number of bytes to write.
 137          * @returns ERROR_OK if successful; otherwise, an error code.
 138          */
 139         int (*write)(struct flash_bank *bank,
 140                         uint8_t *buffer, uint32_t offset, uint32_t count);
 141
 142         /**
 143          * Read data from the flash. Note CPU address will be
 144          * "bank->base + offset", while the physical address is
 145          * dependent upon current target MMU mappings.
 146          *
 147          * @param bank The bank to read.
 148          * @param buffer The data bytes read.
 149          * @param offset The offset into the chip to read.
 150          * @param count The number of bytes to read.
 151          * @returns ERROR_OK if successful; otherwise, an error code.
 152          */
 153          int (*read)(struct flash_bank *bank,
 154                         uint8_t *buffer, uint32_t offset, uint32_t count);
 155
 156         /**
 157          * Probe to determine what kind of flash is present.
 158          * This is invoked by the "probe" script command.
 159          *
 160          * @param bank The bank to probe
 161          * @returns ERROR_OK if successful; otherwise, an error code.
 162          */
 163         int (*probe)(struct flash_bank *bank);
 164
 165         /**
 166          * Check the erasure status of a flash bank.
 167          * When called, the driver routine must perform the required
 168          * checks and then set the @c flash_sector_s::is_erased field
 169          * for each of the flash banks's sectors.
 170          *
 171          * @param bank The bank to check
 172          * @returns ERROR_OK if successful; otherwise, an error code.
 173          */
 174         int (*erase_check)(struct flash_bank *bank);
 175
 176         /**
 177          * Determine if the specific bank is "protected" or not.
 178          * When called, the driver routine must must perform the
 179          * required protection check(s) and then set the @c
 180          * flash_sector_s::is_protected field for each of the flash
 181          * bank's sectors.
 182          *
 183          * @param bank - the bank to check
 184          * @returns ERROR_OK if successful; otherwise, an error code.
 185          */
 186         int (*protect_check)(struct flash_bank *bank);
 187
 188         /**
 189          * Display human-readable information about the flash
 190          * bank into the given buffer.  Drivers must be careful to avoid
 191          * overflowing the buffer.
 192          *
 193          * @param bank - the bank to get info about
 194          * @param char - where to put the text for the human to read
 195          * @param buf_size - the size of the human buffer.
 196          * @returns ERROR_OK if successful; otherwise, an error code.
 197          */
 198         int (*info)(struct flash_bank *bank, char *buf, int buf_size);
 199
 200         /**
 201          * A more gentle flavor of filash_driver_s::probe, performing
 202          * setup with less noise.  Generally, driver routines should test
 203          * to see if the bank has already been probed; if it has, the
 204          * driver probably should not perform its probe a second time.
 205          *
 206          * This callback is often called from the inside of other
 207          * routines (e.g. GDB flash downloads) to autoprobe the flash as
 208          * it is programing the flash.
 209          *
 210          * @param bank - the bank to probe
 211          * @returns ERROR_OK if successful; otherwise, an error code.
 212          */
 213         int (*auto_probe)(struct flash_bank *bank);
 214 };
 215
 216 #define FLASH_BANK_COMMAND_HANDLER(name) \
 217         static __FLASH_BANK_COMMAND(name)
 218
 219 /**
 220  * Find a NOR flash driver by its name.
 221  * @param name The name of the requested driver.
 222  * @returns The flash_driver called @c name, or NULL if not found.
 223  */
 224 struct flash_driver *flash_driver_find_by_name(const char *name);
 225
 226 #endif /* FLASH_NOR_DRIVER_H */