pxa2xx_spi.h

pxa3xx ssp driver for linux

/*
  2  * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
  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  */
  
  #ifndef PXA2XX_SPI_H_
  #define PXA2XX_SPI_H_
  
  #define PXA2XX_CS_ASSERT (0x01)
  #define PXA2XX_CS_DEASSERT (0x02)
  
  #if defined(CONFIG_PXA25x)
  #define CLOCK_SPEED_HZ 3686400
  #define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/2/(x+1))<<8)&0x0000ff00)
  #define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  #define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  #define SSP_TIMEOUT_SCALE (2712)
  #elif defined(CONFIG_PXA27x)
  #define CLOCK_SPEED_HZ 13000000
  #define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  #define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  #define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  #define SSP_TIMEOUT_SCALE (769)
  #endif
  
  #define SSP_TIMEOUT(x) ((x*10000)/SSP_TIMEOUT_SCALE)
  #define SSP1_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(1)))))
  #define SSP2_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(2)))))
  #define SSP3_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(3)))))
  
  enum pxa_ssp_type {
          SSP_UNDEFINED = 0,
          PXA25x_SSP,  /* pxa 210, 250, 255, 26x */
          PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
          PXA27x_SSP,
  };
  
  /* device.platform_data for SSP controller devices */
  struct pxa2xx_spi_master {
          enum pxa_ssp_type ssp_type;
          u32 clock_enable;
          u16 num_chipselect;
          u8 enable_dma;
  };
  
  /* spi_board_info.controller_data for SPI slave devices,
 60  * copied to spi_device.platform_data ... mostly for dma tuning
 61  */
  struct pxa2xx_spi_chip {
          u8 tx_threshold;
          u8 rx_threshold;
          u8 dma_burst_size;
          u32 timeout_microsecs;
          u8 enable_loopback;
          void (*cs_control)(u32 command);
  };
  
  #endif /*PXA2XX_SPI_H_*/