include/linux/eeprom_93cx6.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3         Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
   4         <http://rt2x00.serialmonkey.com>
   5
   6  */
   7
   8 /*
   9         Module: eeprom_93cx6
  10         Abstract: EEPROM reader datastructures for 93cx6 chipsets.
  11         Supported chipsets: 93c46, 93c56 and 93c66.
  12  */
  13
  14 #include <linux/bits.h>
  15
  16 /*
  17  * EEPROM operation defines.
  18  */
  19 #define PCI_EEPROM_WIDTH_93C46  6
  20 #define PCI_EEPROM_WIDTH_93C56  8
  21 #define PCI_EEPROM_WIDTH_93C66  8
  22 #define PCI_EEPROM_WIDTH_93C86  8
  23 #define PCI_EEPROM_WIDTH_OPCODE 3
  24 #define PCI_EEPROM_WRITE_OPCODE 0x05
  25 #define PCI_EEPROM_ERASE_OPCODE 0x07
  26 #define PCI_EEPROM_READ_OPCODE  0x06
  27 #define PCI_EEPROM_EWDS_OPCODE  0x10
  28 #define PCI_EEPROM_EWEN_OPCODE  0x13
  29
  30 /**
  31  * struct eeprom_93cx6 - control structure for setting the commands
  32  * for reading the eeprom data.
  33  * @data: private pointer for the driver.
  34  * @register_read(struct eeprom_93cx6 *eeprom): handler to
  35  * read the eeprom register, this function should set all reg_* fields.
  36  * @register_write(struct eeprom_93cx6 *eeprom): handler to
  37  * write to the eeprom register by using all reg_* fields.
  38  * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
  39  * @quirks: eeprom or controller quirks
  40  * @drive_data: Set if we're driving the data line.
  41  * @reg_data_in: register field to indicate data input
  42  * @reg_data_out: register field to indicate data output
  43  * @reg_data_clock: register field to set the data clock
  44  * @reg_chip_select: register field to set the chip select
  45  *
  46  * This structure is used for the communication between the driver
  47  * and the eeprom_93cx6 handlers for reading the eeprom.
  48  */
  49 struct eeprom_93cx6 {
  50         void *data;
  51
  52         void (*register_read)(struct eeprom_93cx6 *eeprom);
  53         void (*register_write)(struct eeprom_93cx6 *eeprom);
  54
  55         int width;
  56         unsigned int quirks;
  57 /* Some EEPROMs require an extra clock cycle before reading */
  58 #define PCI_EEPROM_QUIRK_EXTRA_READ_CYCLE       BIT(0)
  59
  60         char drive_data;
  61         char reg_data_in;
  62         char reg_data_out;
  63         char reg_data_clock;
  64         char reg_chip_select;
  65 };
  66
  67 extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
  68         const u8 word, u16 *data);
  69 extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
  70         const u8 word, __le16 *data, const u16 words);
  71 extern void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom,
  72         const u8 byte, u8 *data);
  73 extern void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom,
  74         const u8 byte, u8 *data, const u16 bytes);
  75
  76 extern void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable);
  77
  78 extern void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom,
  79                                u8 addr, u16 data);
  80
  81 static inline bool has_quirk_extra_read_cycle(struct eeprom_93cx6 *eeprom)
  82 {
  83         return eeprom->quirks & PCI_EEPROM_QUIRK_EXTRA_READ_CYCLE;
  84 }