source: rtems/c/src/lib/libbsp/powerpc/gen83xx/spi/spi_init.c @ e570c313

/*===============================================================*\
| Project: RTEMS support for MPC83xx                              |
+-----------------------------------------------------------------+
|                    Copyright (c) 2007                           |
|                    Embedded Brains GmbH                         |
|                    Obere Lagerstr. 30                           |
|                    D-82178 Puchheim                             |
|                    Germany                                      |
|                    rtems@embedded-brains.de                     |
+-----------------------------------------------------------------+
| The license and distribution terms for this file may be         |
| found in the file LICENSE in this distribution or at            |
|                                                                 |
| http://www.rtems.com/license/LICENSE.                           |
|                                                                 |
+-----------------------------------------------------------------+
| this file contains the low level MPC83xx SPI driver parameters  |
| and board-specific functions                                    |
\*===============================================================*/

/*
 *  $Id$
 */

#include <mpc83xx/mpc83xx_spidrv.h>
#include <bsp/irq.h>
#include <bsp.h>

#if defined( MPC8313ERDB)

#include <libchip/spi-sd-card.h>

#elif defined( MPC8349EAMDS)

#include <libchip/spi-flash-m25p40.h>

#elif defined( HSC_CM01)

#include <libchip/spi-fram-fm25l256.h>

#else

#warning No SPI configuration available

#endif

/*=========================================================================*\
| Board-specific adaptation functions                                       |
\*=========================================================================*/

/*=========================================================================*\
| Function:                                                                 |
\*-------------------------------------------------------------------------*/
static rtems_status_code bsp_spi_sel_addr
(
/*-------------------------------------------------------------------------*\
| Purpose:                                                                  |
|   address a slave device on the bus                                       |
+---------------------------------------------------------------------------+
| Input Parameters:                                                         |
\*-------------------------------------------------------------------------*/
 rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
 uint32_t addr,                          /* address to send on bus         */
 int rw                                  /* 0=write,1=read                 */
)
/*-------------------------------------------------------------------------*\
| Return Value:                                                             |
|    o = ok or error code                                                   |
\*=========================================================================*/
{

#if defined( MPC8313ERDB)

  /* Check address */
  if (addr > 0) {
    return RTEMS_INVALID_NUMBER;
  }

  /* SCS (active low) */
  mpc83xx.gpio [0].gpdat &= ~0x20000000;

#elif defined( MPC8349EAMDS)

  /*
   * check device address for valid range
   */
  if (addr > 0) {
    return RTEMS_INVALID_NUMBER;
  }
  /*
   * select given device
   * GPIO1[0] is nSEL_SPI for M25P40
   * set it to be active/low
   */
  mpc83xx.gpio[0].gpdat &= ~(1 << (31- 0));

#elif defined( HSC_CM01)

  /*
   * check device address for valid range
   */
  if (addr > 7) {
    return RTEMS_INVALID_NUMBER;
  }
  /*
   * select given device
   */
  /*
   * GPIO1[24] is SPI_A0
   * GPIO1[25] is SPI_A1
   * GPIO1[26] is SPI_A2
   * set pins to address
   */
  mpc83xx.gpio[0].gpdat =
    (mpc83xx.gpio[0].gpdat & ~(0x7  << (31-26)))
    |                         (addr << (31-26));
  /*
   * GPIO1[27] is high-active strobe
   */
  mpc83xx.gpio[0].gpdat |= (1 << (31- 27));

#endif

  return  RTEMS_SUCCESSFUL;
}

/*=========================================================================*\
| Function:                                                                 |
\*-------------------------------------------------------------------------*/
static rtems_status_code bsp_spi_send_start_dummy
(
/*-------------------------------------------------------------------------*\
| Purpose:                                                                  |
|   dummy function, SPI has no start condition                              |
+---------------------------------------------------------------------------+
| Input Parameters:                                                         |
\*-------------------------------------------------------------------------*/
 rtems_libi2c_bus_t *bh                  /* bus specifier structure        */
)
/*-------------------------------------------------------------------------*\
| Return Value:                                                             |
|    o = ok or error code                                                   |
\*=========================================================================*/
{

#if defined( MPC8313ERDB)

  /* SCS (inactive high) */
  mpc83xx.gpio [0].gpdat |= 0x20000000;

#elif defined( MPC8349EAMDS)

  /*
   * GPIO1[0] is nSEL_SPI for M25P40
   * set it to inactive/high
   */
  mpc83xx.gpio[0].gpdat |=  (1 << (31- 0));

#elif defined( HSC_CM01)

  /*
   * GPIO1[27] is high-active strobe
   * set it to inactive/ low
   */
  mpc83xx.gpio[0].gpdat &= ~(0x1 << (31-27));

#endif

  return 0;
}

/*=========================================================================*\
| Function:                                                                 |
\*-------------------------------------------------------------------------*/
static rtems_status_code bsp_spi_send_stop
(
/*-------------------------------------------------------------------------*\
| Purpose:                                                                  |
|   deselect SPI                                                            |
+---------------------------------------------------------------------------+
| Input Parameters:                                                         |
\*-------------------------------------------------------------------------*/
 rtems_libi2c_bus_t *bh                  /* bus specifier structure        */
)
/*-------------------------------------------------------------------------*\
| Return Value:                                                             |
|    o = ok or error code                                                   |
\*=========================================================================*/
{
#if defined(DEBUG)
  printk("bsp_spi_send_stop called... ");
#endif

#if defined( MPC8313ERDB)

  /* SCS (inactive high) */
  mpc83xx.gpio [0].gpdat |= 0x20000000;

#elif defined( MPC8349EAMDS)

  /*
   * deselect given device
   * GPIO1[0] is nSEL_SPI for M25P40
   * set it to be inactive/high
   */
  mpc83xx.gpio[0].gpdat |=  (1 << (31- 0));

#elif defined( HSC_CM01)

  /*
   * deselect device
   * GPIO1[27] is high-active strobe
   */
  mpc83xx.gpio[0].gpdat &= ~(1 << (31- 27));

#endif

#if defined(DEBUG)
  printk("... exit OK\r\n");
#endif
  return 0;
}

/*=========================================================================*\
| list of handlers                                                          |
\*=========================================================================*/

rtems_libi2c_bus_ops_t bsp_spi_ops = {
  .init = mpc83xx_spi_init,
  .send_start = bsp_spi_send_start_dummy,
  .send_stop = bsp_spi_send_stop,
  .send_addr = bsp_spi_sel_addr,
  .read_bytes = mpc83xx_spi_read_bytes,
  .write_bytes = mpc83xx_spi_write_bytes,
  .ioctl = mpc83xx_spi_ioctl
};

static mpc83xx_spi_desc_t bsp_spi_bus_desc = {
  {/* public fields */
    .ops = &bsp_spi_ops,
    .size = sizeof(bsp_spi_bus_desc)
  },
  { /* our private fields */
    .reg_ptr =&mpc83xx.spi,
    .initialized = FALSE,
    .irq_number = BSP_IPIC_IRQ_SPI,
    .base_frq = 0 /* filled in during init */
  }
};

#ifdef MPC8313ERDB

#include <libchip/spi-sd-card.h>

#define SD_CARD_NUMBER 1

size_t sd_card_driver_table_size = SD_CARD_NUMBER;

sd_card_driver_entry sd_card_driver_table [SD_CARD_NUMBER] = {
  {
    .device_name = "/dev/sd-card-a",
    .bus = 0,
    .transfer_mode = SD_CARD_TRANSFER_MODE_DEFAULT,
    .command = SD_CARD_COMMAND_DEFAULT,
    /* .response = whatever, */
    .response_index = SD_CARD_COMMAND_SIZE,
    .n_ac_max = SD_CARD_N_AC_MAX_DEFAULT,
    .block_number = 0,
    .block_size = 0,
    .block_size_shift = 0,
    .busy = true,
    .verbose = true,
    .schedule_if_busy = false
  }
};

#endif /* MPC8313ERDB */


/*=========================================================================*\
| initialization                                                            |
\*=========================================================================*/

/*=========================================================================*\
| Function:                                                                 |
\*-------------------------------------------------------------------------*/
rtems_status_code bsp_register_spi
(
/*-------------------------------------------------------------------------*\
| Purpose:                                                                  |
|   register SPI bus and devices                                            |
+---------------------------------------------------------------------------+
| Input Parameters:                                                         |
\*-------------------------------------------------------------------------*/
 void                                    /* <none>                         */
)
/*-------------------------------------------------------------------------*\
| Return Value:                                                             |
|    0 or error code                                                        |
\*=========================================================================*/
{
  rtems_status_code sc = RTEMS_SUCCESSFUL;
  int ret_code;
  unsigned spi_busno;

  /*
   * init I2C library (if not already done)
   */
  rtems_libi2c_initialize ();

  /*
   * init port pins used to address/select SPI devices
   */

#if defined( MPC8313ERDB)

  /*
   * Configured as master (direct connection to SD card)
   *
   * GPIO[28] : SOUT
   * GPIO[29] : SIN
   * GPIO[30] : SCLK
   * GPIO[02] : SCS (inactive high), GPIO[02] is normally connected to U43 at
   * pin 15 of MC74LCX244DT.
   */

  /* Function */
  mpc83xx.syscon.sicrl = (mpc83xx.syscon.sicrl & ~0x03fc0000) | 0x30000000;

  /* Direction */
  mpc83xx.gpio [0].gpdir = (mpc83xx.gpio [0].gpdir & ~0x0000000f) | 0x2000000b;

  /* Data */
  mpc83xx.gpio [0].gpdat |= 0x20000000;

  /* Open Drain */
  /* mpc83xx.gpio [0].gpdr  |= 0x0000000f; */

#elif defined( MPC8349EAMDS)

  /*
   * GPIO1[0] is nSEL_SPI for M25P40
   * set it to be output, high
   */
  mpc83xx.gpio[0].gpdat |=  (1 << (31- 0));
  mpc83xx.gpio[0].gpdir |=  (1 << (31- 0));
  mpc83xx.gpio[0].gpdr  &= ~(1 << (31- 0));

#elif defined( HSC_CM01)

  /*
   * GPIO1[24] is SPI_A0
   * GPIO1[25] is SPI_A1
   * GPIO1[26] is SPI_A2
   * GPIO1[27] is high-active strobe
   * set pins to be output, low
   */
  mpc83xx.gpio[0].gpdat &= ~(0xf << (31-27));
  mpc83xx.gpio[0].gpdir |=  (0xf << (31-27));
  mpc83xx.gpio[0].gpdr  &= ~(0xf << (31-27));

#endif

  /*
   * update base frequency in spi descriptor
   */
  bsp_spi_bus_desc.softc.base_frq = BSP_bus_frequency;

  /*
   * register SPI bus
   */
  ret_code = rtems_libi2c_register_bus("/dev/spi",
                                       &(bsp_spi_bus_desc.bus_desc));
  if (ret_code < 0) {
    return -ret_code;
  }
  spi_busno = (unsigned) ret_code;

#if defined( MPC8313ERDB)

  /* Register SD Card driver */
  sd_card_driver_table [0].bus = spi_busno;
  sc = sd_card_register();
  if (sc != RTEMS_SUCCESSFUL) {
    return sc;
  }

#elif defined( MPC8349EAMDS)

  /*
   * register M25P40 Flash
   */
  ret_code = rtems_libi2c_register_drv(RTEMS_BSP_SPI_FLASH_DEVICE_NAME,
                                       spi_flash_m25p40_rw_driver_descriptor,
                                       spi_busno,0x00);
#elif defined(HSC_CM01)

  /*
   * register FM25L256 FRAM
   */
  ret_code = rtems_libi2c_register_drv(RTEMS_BSP_SPI_FRAM_DEVICE_NAME,
                                       spi_fram_fm25l256_rw_driver_descriptor,
                                       spi_busno,0x02);

#endif

  if (ret_code < 0) {
    return -ret_code;
  }

  /*
   * FIXME: further drivers, when available
   */
  return 0;
}