forked from Imagelibrary/rtems
153 lines
4.9 KiB
C
153 lines
4.9 KiB
C
/*===============================================================*\
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| Project: RTEMS support for MPC83xx |
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+-----------------------------------------------------------------+
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| Copyright (c) 2007 |
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| Embedded Brains GmbH |
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| Obere Lagerstr. 30 |
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| D-82178 Puchheim |
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| Germany |
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| rtems@embedded-brains.de |
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+-----------------------------------------------------------------+
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| The license and distribution terms for this file may be |
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| found in the file LICENSE in this distribution or at |
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| http://www.rtems.org/license/LICENSE. |
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+-----------------------------------------------------------------+
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| this file contains the low level MPC83xx I2C driver parameters |
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\*===============================================================*/
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#include <mpc83xx/mpc83xx_i2cdrv.h>
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#include <libchip/i2c-2b-eeprom.h>
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#include <libchip/i2c-sc620.h>
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#include <bsp/irq.h>
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#include <bsp.h>
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static void i2c1_probe(mpc83xx_i2c_softc_t *self)
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{
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#if MPC83XX_CHIP_TYPE != 8309
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if (((mpc83xx.clk.sccr >> (31-1)) & 0x03) > 0) {
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self->base_frq =
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(BSP_bus_frequency
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/((mpc83xx.clk.sccr >> (31-1)) & 0x03));
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}
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#else /* MPC83XX_CHIP_TYPE != 8309 */
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self->base_frq = BSP_bus_frequency;
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#endif /* MPC83XX_CHIP_TYPE != 8309 */
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}
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#ifndef MPC83XX_BOARD_BR_UID
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static void i2c2_probe(mpc83xx_i2c_softc_t *self)
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{
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self->base_frq = BSP_bus_frequency;
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}
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#endif /* MPC83XX_BOARD_BR_UID */
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static mpc83xx_i2c_desc_t mpc83xx_i2c_bus_tbl[] = {
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/* first channel */
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{
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{/* public fields */
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.ops = &mpc83xx_i2c_ops,
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.size = sizeof(mpc83xx_i2c_bus_tbl[0]),
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},
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{ /* our private fields */
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.reg_ptr = &mpc83xx.i2c[0],
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.initialized = FALSE,
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.irq_number = BSP_IPIC_IRQ_I2C1,
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.base_frq = 0, /* will be set during probe */
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.probe = i2c1_probe
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}
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}
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#ifndef MPC83XX_BOARD_BR_UID
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/* second channel */
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, {
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{ /* public fields */
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.ops = &mpc83xx_i2c_ops,
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.size = sizeof(mpc83xx_i2c_bus_tbl[0]),
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},
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{ /* our private fields */
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.reg_ptr = &mpc83xx.i2c[1],
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.initialized = FALSE,
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.irq_number = BSP_IPIC_IRQ_I2C2,
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.base_frq = 0, /* will be set during probe */
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.probe = i2c2_probe
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}
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}
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#endif /* MPC83XX_BOARD_BR_UID */
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};
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/*=========================================================================*\
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| Function: |
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\*-------------------------------------------------------------------------*/
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rtems_status_code bsp_register_i2c
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(
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/*-------------------------------------------------------------------------*\
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| Purpose: |
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| register I2C busses and devices |
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+---------------------------------------------------------------------------+
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| Input Parameters: |
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\*-------------------------------------------------------------------------*/
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void /* <none> */
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)
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/*-------------------------------------------------------------------------*\
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| Return Value: |
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| 0 or error code |
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\*=========================================================================*/
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{
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char device_path[] = "/dev/i2c?";
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size_t n = RTEMS_ARRAY_SIZE(mpc83xx_i2c_bus_tbl);
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size_t i;
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int i2c_busno[n];
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/*
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* init I2C library (if not already done)
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*/
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rtems_libi2c_initialize ();
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/*
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* init I2C buses
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*/
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for (i = 0; i < n; ++i) {
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mpc83xx_i2c_desc_t *desc = &mpc83xx_i2c_bus_tbl[i];
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(*desc->softc.probe)(&desc->softc);
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device_path[sizeof(device_path) - 2] = (char) ('1' + i);
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i2c_busno[i] = rtems_libi2c_register_bus(device_path, &desc->bus_desc);
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}
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#if defined(RTEMS_BSP_I2C_EEPROM_DEVICE_NAME)
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if (n > 0) {
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/*
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* register EEPROM to bus 1, Address 0x50
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*/
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rtems_libi2c_register_drv(RTEMS_BSP_I2C_EEPROM_DEVICE_NAME,
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i2c_2b_eeprom_driver_descriptor,
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i2c_busno[0],0x50);
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}
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#elif defined(MPC83XX_BOARD_BR_UID)
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if (n > 0) {
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rtems_libi2c_register_drv(
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"sc620",
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&i2c_sc620_driver,
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i2c_busno[0],
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0x70
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);
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}
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#else
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/*
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* We have no i2c configuration for this variant but need to mark
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* i2c_busno as used.
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*/
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(void) i2c_busno[0]; /* avoid set but not used warning */
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#endif
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/*
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* FIXME: register RTC driver, when available
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*/
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return RTEMS_SUCCESSFUL;
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}
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