/*===============================================================*\
| 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.org/license/LICENSE. |
| |
+-----------------------------------------------------------------+
| this file contains the low level MPC83xx SPI driver parameters |
| and board-specific functions |
\*===============================================================*/
#include <mpc83xx/mpc83xx_spidrv.h>
#include <bsp/irq.h>
#include <bsp.h>
#if defined( MPC83XX_BOARD_MPC8313ERDB)
#include <libchip/spi-sd-card.h>
#elif defined( MPC83XX_BOARD_MPC8349EAMDS)
#include <libchip/spi-flash-m25p40.h>
#elif defined( MPC83XX_BOARD_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( MPC83XX_BOARD_MPC8313ERDB)
/* Check address */
if (addr > 0) {
return RTEMS_INVALID_NUMBER;
}
/* SCS (active low) */
mpc83xx.gpio [0].gpdat &= ~0x20000000;
#elif defined( MPC83XX_BOARD_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( MPC83XX_BOARD_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( MPC83XX_BOARD_MPC8313ERDB)
/* SCS (inactive high) */
mpc83xx.gpio [0].gpdat |= 0x20000000;
#elif defined( MPC83XX_BOARD_MPC8349EAMDS)
/*
* GPIO1[0] is nSEL_SPI for M25P40
* set it to inactive/high
*/
mpc83xx.gpio[0].gpdat |= (1 << (31- 0));
#elif defined( MPC83XX_BOARD_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( MPC83XX_BOARD_MPC8313ERDB)
/* SCS (inactive high) */
mpc83xx.gpio [0].gpdat |= 0x20000000;
#elif defined( MPC83XX_BOARD_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( MPC83XX_BOARD_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 MPC83XX_BOARD_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 /* MPC83XX_BOARD_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( MPC83XX_BOARD_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( MPC83XX_BOARD_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( MPC83XX_BOARD_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( MPC83XX_BOARD_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( MPC83XX_BOARD_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(MPC83XX_BOARD_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;
}
