arch/arm/mach-imx/include/mach/spi_imx.h

   1 /*
   2  * arch/arm/mach-imx/include/mach/spi_imx.h
   3  *
   4  * Copyright (C) 2006 SWAPP
   5  *      Andrea Paterniani <a.paterniani@swapp-eng.it>
   6  *
   7  * Initial version inspired by:
   8  *      linux-2.6.17-rc3-mm1/arch/arm/mach-pxa/include/mach/pxa2xx_spi.h
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #ifndef SPI_IMX_H_
  26 #define SPI_IMX_H_
  27
  28
  29 /*-------------------------------------------------------------------------*/
  30 /**
  31  * struct spi_imx_master - device.platform_data for SPI controller devices.
  32  * @num_chipselect: chipselects are used to distinguish individual
  33  *      SPI slaves, and are numbered from zero to num_chipselects - 1.
  34  *      each slave has a chipselect signal, but it's common that not
  35  *      every chipselect is connected to a slave.
  36  * @enable_dma: if true enables DMA driven transfers.
  37 */
  38 struct spi_imx_master {
  39         u8 num_chipselect;
  40         u8 enable_dma:1;
  41 };
  42 /*-------------------------------------------------------------------------*/
  43
  44
  45 /*-------------------------------------------------------------------------*/
  46 /**
  47  * struct spi_imx_chip - spi_board_info.controller_data for SPI
  48  * slave devices, copied to spi_device.controller_data.
  49  * @enable_loopback : used for test purpouse to internally connect RX and TX
  50  *      sections.
  51  * @enable_dma : enables dma transfer (provided that controller driver has
  52  *      dma enabled too).
  53  * @ins_ss_pulse : enable /SS pulse insertion between SPI burst.
  54  * @bclk_wait : number of bclk waits between each bits_per_word SPI burst.
  55  * @cs_control : function pointer to board-specific function to assert/deassert
  56  *      I/O port to control HW generation of devices chip-select.
  57 */
  58 struct spi_imx_chip {
  59         u8      enable_loopback:1;
  60         u8      enable_dma:1;
  61         u8      ins_ss_pulse:1;
  62         u16     bclk_wait:15;
  63         void (*cs_control)(u32 control);
  64 };
  65
  66 /* Chip-select state */
  67 #define SPI_CS_ASSERT                   (1 << 0)
  68 #define SPI_CS_DEASSERT                 (1 << 1)
  69 /*-------------------------------------------------------------------------*/
  70
  71
  72 #endif /* SPI_IMX_H_*/