include/linux/platform_data/spi-davinci.h

   1 /*
   2  * Copyright 2009 Texas Instruments.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #ifndef __ARCH_ARM_DAVINCI_SPI_H
  20 #define __ARCH_ARM_DAVINCI_SPI_H
  21
  22 #include <linux/platform_data/edma.h>
  23
  24 #define SPI_INTERN_CS   0xFF
  25
  26 enum {
  27         SPI_VERSION_1, /* For DM355/DM365/DM6467 */
  28         SPI_VERSION_2, /* For DA8xx */
  29 };
  30
  31 /**
  32  * davinci_spi_platform_data - Platform data for SPI master device on DaVinci
  33  *
  34  * @version:    version of the SPI IP. Different DaVinci devices have slightly
  35  *              varying versions of the same IP.
  36  * @num_chipselect: number of chipselects supported by this SPI master
  37  * @intr_line:  interrupt line used to connect the SPI IP to the ARM interrupt
  38  *              controller withn the SoC. Possible values are 0 and 1.
  39  * @chip_sel:   list of GPIOs which can act as chip-selects for the SPI.
  40  *              SPI_INTERN_CS denotes internal SPI chip-select. Not necessary
  41  *              to populate if all chip-selects are internal.
  42  * @cshold_bug: set this to true if the SPI controller on your chip requires
  43  *              a write to CSHOLD bit in between transfers (like in DM355).
  44  * @dma_event_q: DMA event queue to use if SPI_IO_TYPE_DMA is used for any
  45  *              device on the bus.
  46  */
  47 struct davinci_spi_platform_data {
  48         u8                      version;
  49         u8                      num_chipselect;
  50         u8                      intr_line;
  51         u8                      *chip_sel;
  52         u8                      prescaler_limit;
  53         bool                    cshold_bug;
  54         enum dma_event_q        dma_event_q;
  55 };
  56
  57 /**
  58  * davinci_spi_config - Per-chip-select configuration for SPI slave devices
  59  *
  60  * @wdelay:     amount of delay between transmissions. Measured in number of
  61  *              SPI module clocks.
  62  * @odd_parity: polarity of parity flag at the end of transmit data stream.
  63  *              0 - odd parity, 1 - even parity.
  64  * @parity_enable: enable transmission of parity at end of each transmit
  65  *              data stream.
  66  * @io_type:    type of IO transfer. Choose between polled, interrupt and DMA.
  67  * @timer_disable: disable chip-select timers (setup and hold)
  68  * @c2tdelay:   chip-select setup time. Measured in number of SPI module clocks.
  69  * @t2cdelay:   chip-select hold time. Measured in number of SPI module clocks.
  70  * @t2edelay:   transmit data finished to SPI ENAn pin inactive time. Measured
  71  *              in number of SPI clocks.
  72  * @c2edelay:   chip-select active to SPI ENAn signal active time. Measured in
  73  *              number of SPI clocks.
  74  */
  75 struct davinci_spi_config {
  76         u8      wdelay;
  77         u8      odd_parity;
  78         u8      parity_enable;
  79 #define SPI_IO_TYPE_INTR        0
  80 #define SPI_IO_TYPE_POLL        1
  81 #define SPI_IO_TYPE_DMA         2
  82         u8      io_type;
  83         u8      timer_disable;
  84         u8      c2tdelay;
  85         u8      t2cdelay;
  86         u8      t2edelay;
  87         u8      c2edelay;
  88 };
  89
  90 #endif  /* __ARCH_ARM_DAVINCI_SPI_H */