include/asm-arm/arch-pxa/pxa2xx_spi.h

   1 /*
   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  */
  18
  19 #ifndef PXA2XX_SPI_H_
  20 #define PXA2XX_SPI_H_
  21
  22 #define PXA2XX_CS_ASSERT (0x01)
  23 #define PXA2XX_CS_DEASSERT (0x02)
  24
  25 #if defined(CONFIG_PXA25x)
  26 #define CLOCK_SPEED_HZ 3686400
  27 #define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/2/(x+1))<<8)&0x0000ff00)
  28 #define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  29 #define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  30 #define SSP_TIMEOUT_SCALE (2712)
  31 #elif defined(CONFIG_PXA27x)
  32 #define CLOCK_SPEED_HZ 13000000
  33 #define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  34 #define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  35 #define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
  36 #define SSP_TIMEOUT_SCALE (769)
  37 #endif
  38
  39 #define SSP_TIMEOUT(x) ((x*10000)/SSP_TIMEOUT_SCALE)
  40 #define SSP1_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(1)))))
  41 #define SSP2_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(2)))))
  42 #define SSP3_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(3)))))
  43
  44 enum pxa_ssp_type {
  45         SSP_UNDEFINED = 0,
  46         PXA25x_SSP,  /* pxa 210, 250, 255, 26x */
  47         PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
  48         PXA27x_SSP,
  49 };
  50
  51 /* device.platform_data for SSP controller devices */
  52 struct pxa2xx_spi_master {
  53         enum pxa_ssp_type ssp_type;
  54         u32 clock_enable;
  55         u16 num_chipselect;
  56         u8 enable_dma;
  57 };
  58
  59 /* spi_board_info.controller_data for SPI slave devices,
  60  * copied to spi_device.platform_data ... mostly for dma tuning
  61  */
  62 struct pxa2xx_spi_chip {
  63         u8 tx_threshold;
  64         u8 rx_threshold;
  65         u8 dma_burst_size;
  66         u32 timeout_microsecs;
  67         u8 enable_loopback;
  68         void (*cs_control)(u32 command);
  69 };
  70
  71 #endif /*PXA2XX_SPI_H_*/