arch/blackfin/include/asm/bfin5xx_spi.h

   1 /*
   2  * Blackfin On-Chip SPI Driver
   3  *
   4  * Copyright 2004-2008 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #ifndef _SPI_CHANNEL_H_
  10 #define _SPI_CHANNEL_H_
  11
  12 #define MIN_SPI_BAUD_VAL        2
  13
  14 #define BIT_CTL_ENABLE      0x4000
  15 #define BIT_CTL_OPENDRAIN   0x2000
  16 #define BIT_CTL_MASTER      0x1000
  17 #define BIT_CTL_CPOL        0x0800
  18 #define BIT_CTL_CPHA        0x0400
  19 #define BIT_CTL_LSBF        0x0200
  20 #define BIT_CTL_WORDSIZE    0x0100
  21 #define BIT_CTL_EMISO       0x0020
  22 #define BIT_CTL_PSSE        0x0010
  23 #define BIT_CTL_GM          0x0008
  24 #define BIT_CTL_SZ          0x0004
  25 #define BIT_CTL_RXMOD       0x0000
  26 #define BIT_CTL_TXMOD       0x0001
  27 #define BIT_CTL_TIMOD_DMA_TX 0x0003
  28 #define BIT_CTL_TIMOD_DMA_RX 0x0002
  29 #define BIT_CTL_SENDOPT     0x0004
  30 #define BIT_CTL_TIMOD       0x0003
  31
  32 #define BIT_STAT_SPIF       0x0001
  33 #define BIT_STAT_MODF       0x0002
  34 #define BIT_STAT_TXE        0x0004
  35 #define BIT_STAT_TXS        0x0008
  36 #define BIT_STAT_RBSY       0x0010
  37 #define BIT_STAT_RXS        0x0020
  38 #define BIT_STAT_TXCOL      0x0040
  39 #define BIT_STAT_CLR        0xFFFF
  40
  41 #define BIT_STU_SENDOVER    0x0001
  42 #define BIT_STU_RECVFULL    0x0020
  43
  44 /*
  45  * All Blackfin system MMRs are padded to 32bits even if the register
  46  * itself is only 16bits.  So use a helper macro to streamline this.
  47  */
  48 #define __BFP(m) u16 m; u16 __pad_##m
  49
  50 /*
  51  * bfin spi registers layout
  52  */
  53 struct bfin_spi_regs {
  54         __BFP(ctl);
  55         __BFP(flg);
  56         __BFP(stat);
  57         __BFP(tdbr);
  58         __BFP(rdbr);
  59         __BFP(baud);
  60         __BFP(shadow);
  61 };
  62
  63 #undef __BFP
  64
  65 #define MAX_CTRL_CS          8  /* cs in spi controller */
  66
  67 /* device.platform_data for SSP controller devices */
  68 struct bfin5xx_spi_master {
  69         u16 num_chipselect;
  70         u8 enable_dma;
  71         u16 pin_req[7];
  72 };
  73
  74 /* spi_board_info.controller_data for SPI slave devices,
  75  * copied to spi_device.platform_data ... mostly for dma tuning
  76  */
  77 struct bfin5xx_spi_chip {
  78         u16 ctl_reg;
  79         u8 enable_dma;
  80         u8 bits_per_word;
  81         u16 cs_chg_udelay; /* Some devices require 16-bit delays */
  82         /* Value to send if no TX value is supplied, usually 0x0 or 0xFFFF */
  83         u16 idle_tx_val;
  84         u8 pio_interrupt; /* Enable spi data irq */
  85 };
  86
  87 #endif /* _SPI_CHANNEL_H_ */