drivers/net/ethernet/sfc/spi.h

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005 Fen Systems Ltd.
   4  * Copyright 2006-2010 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #ifndef EFX_SPI_H
  12 #define EFX_SPI_H
  13
  14 #include "net_driver.h"
  15
  16 /**************************************************************************
  17  *
  18  * Basic SPI command set and bit definitions
  19  *
  20  *************************************************************************/
  21
  22 #define SPI_WRSR 0x01           /* Write status register */
  23 #define SPI_WRITE 0x02          /* Write data to memory array */
  24 #define SPI_READ 0x03           /* Read data from memory array */
  25 #define SPI_WRDI 0x04           /* Reset write enable latch */
  26 #define SPI_RDSR 0x05           /* Read status register */
  27 #define SPI_WREN 0x06           /* Set write enable latch */
  28 #define SPI_SST_EWSR 0x50       /* SST: Enable write to status register */
  29
  30 #define SPI_STATUS_WPEN 0x80    /* Write-protect pin enabled */
  31 #define SPI_STATUS_BP2 0x10     /* Block protection bit 2 */
  32 #define SPI_STATUS_BP1 0x08     /* Block protection bit 1 */
  33 #define SPI_STATUS_BP0 0x04     /* Block protection bit 0 */
  34 #define SPI_STATUS_WEN 0x02     /* State of the write enable latch */
  35 #define SPI_STATUS_NRDY 0x01    /* Device busy flag */
  36
  37 /**
  38  * struct efx_spi_device - an Efx SPI (Serial Peripheral Interface) device
  39  * @device_id:          Controller's id for the device
  40  * @size:               Size (in bytes)
  41  * @addr_len:           Number of address bytes in read/write commands
  42  * @munge_address:      Flag whether addresses should be munged.
  43  *      Some devices with 9-bit addresses (e.g. AT25040A EEPROM)
  44  *      use bit 3 of the command byte as address bit A8, rather
  45  *      than having a two-byte address.  If this flag is set, then
  46  *      commands should be munged in this way.
  47  * @erase_command:      Erase command (or 0 if sector erase not needed).
  48  * @erase_size:         Erase sector size (in bytes)
  49  *      Erase commands affect sectors with this size and alignment.
  50  *      This must be a power of two.
  51  * @block_size:         Write block size (in bytes).
  52  *      Write commands are limited to blocks with this size and alignment.
  53  */
  54 struct efx_spi_device {
  55         int device_id;
  56         unsigned int size;
  57         unsigned int addr_len;
  58         unsigned int munge_address:1;
  59         u8 erase_command;
  60         unsigned int erase_size;
  61         unsigned int block_size;
  62 };
  63
  64 static inline bool efx_spi_present(const struct efx_spi_device *spi)
  65 {
  66         return spi->size != 0;
  67 }
  68
  69 int falcon_spi_cmd(struct efx_nic *efx,
  70                    const struct efx_spi_device *spi, unsigned int command,
  71                    int address, const void *in, void *out, size_t len);
  72 int falcon_spi_wait_write(struct efx_nic *efx,
  73                           const struct efx_spi_device *spi);
  74 int falcon_spi_read(struct efx_nic *efx,
  75                     const struct efx_spi_device *spi, loff_t start,
  76                     size_t len, size_t *retlen, u8 *buffer);
  77 int falcon_spi_write(struct efx_nic *efx,
  78                      const struct efx_spi_device *spi, loff_t start,
  79                      size_t len, size_t *retlen, const u8 *buffer);
  80
  81 /*
  82  * SFC4000 flash is partitioned into:
  83  *     0-0x400       chip and board config (see falcon_hwdefs.h)
  84  *     0x400-0x8000  unused (or may contain VPD if EEPROM not present)
  85  *     0x8000-end    boot code (mapped to PCI expansion ROM)
  86  * SFC4000 small EEPROM (size < 0x400) is used for VPD only.
  87  * SFC4000 large EEPROM (size >= 0x400) is partitioned into:
  88  *     0-0x400       chip and board config
  89  *     configurable  VPD
  90  *     0x800-0x1800  boot config
  91  * Aside from the chip and board config, all of these are optional and may
  92  * be absent or truncated depending on the devices used.
  93  */
  94 #define FALCON_NVCONFIG_END 0x400U
  95 #define FALCON_FLASH_BOOTCODE_START 0x8000U
  96 #define EFX_EEPROM_BOOTCONFIG_START 0x800U
  97 #define EFX_EEPROM_BOOTCONFIG_END 0x1800U
  98
  99 #endif /* EFX_SPI_H */