LXR 6.1/​bsps/​powerpc/​gen83xx/​dev/​mpc83xx_i2cdrv.c	Source navigation Diff markup Identifier search General search
	Version: 6.1 Revert   Change

File indexing completed on 2025-05-11 08:23:53

 /* SPDX-License-Identifier: BSD-2-Clause */
 
 /*
  * RTEMS support for MPC83xx
  *
  * This file contains the MPC83xx I2C driver.
  */
 
 /*
  * Copyright (c) 2007 embedded brains GmbH & Co. KG
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <stdlib.h>
 #include <bsp.h>
 #include <bsp/irq.h>
 #include <mpc83xx/mpc83xx_i2cdrv.h>
 #include <rtems/error.h>
 #include <rtems/bspIo.h>
 #include <errno.h>
 #include <rtems/libi2c.h>
 
 #undef DEBUG
 
 #if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
   #define I2CCR_MEN  (1 << 7)   /* module enable */
 #elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
   #define I2CCR_MDIS (1 << 7)   /* module disable */
 #endif
 #define I2CCR_MIEN (1 << 6)     /* module interrupt enable */
 #define I2CCR_MSTA (1 << 5)     /* 0->1 generates a start condiiton, 1->0 a stop */
 #define I2CCR_MTX  (1 << 4)     /* 0 = receive mode, 1 = transmit mode           */
 #define I2CCR_TXAK (1 << 3)     /* 0 = send ack 1 = send nak during receive      */
 #define I2CCR_RSTA (1 << 2)     /* 1 = send repeated start condition             */
 #define I2CCR_BCST (1 << 0)     /* 0 = disable 1 = enable broadcast accept       */
 
 #define I2CSR_MCF  (1 << 7)     /* data transfer (0=transfer in progres) */
 #define I2CSR_MAAS (1 << 6)     /* addessed as slave   */
 #define I2CSR_MBB  (1 << 5)     /* bus busy            */
 #define I2CSR_MAL  (1 << 4)     /* arbitration lost    */
 #define I2CSR_BCSTM (1 << 3)    /* broadcast match     */
 #define I2CSR_SRW  (1 << 2)     /* slave read/write    */
 #define I2CSR_MIF  (1 << 1)     /* module interrupt    */
 #define I2CSR_RXAK (1 << 0)     /* receive acknowledge */
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static rtems_status_code mpc83xx_i2c_find_clock_divider
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   determine proper divider value                                          |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  uint8_t *result,                        /* result value                   */
  int divider                             /* requested divider              */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    o = ok or error code                                                   |
 \*=========================================================================*/
 {
   int i;
   int fdr_val;
   rtems_status_code sc = RTEMS_SUCCESSFUL;
   struct {
     int divider;
     int fdr_val;
   } dividers[] ={
 #if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
     {  256,0x20 }, {  288,0x21 }, {  320,0x22 }, {  352,0x23 },
     {  384,0x00 }, {  416,0x01 }, {  448,0x25 }, {  480,0x02 },
     {  512,0x26 }, {  576,0x03 }, {  640,0x04 }, {  704,0x05 },
     {  768,0x29 }, {  832,0x06 }, {  896,0x2a }, { 1024,0x07 },
     { 1152,0x08 }, { 1280,0x09 }, { 1536,0x0A }, { 1792,0x2E },
     { 1920,0x0B }, { 2048,0x2F }, { 2304,0x0C }, { 2560,0x0D },
     { 3072,0x0E }, { 3584,0x32 }, { 3840,0x0F }, { 4096,0x33 },
     { 4608,0x10 }, { 5120,0x11 }, { 6144,0x12 }, { 7168,0x36 },
     { 7680,0x13 }, { 8192,0x37 }, { 9216,0x14 }, {10240,0x15 },
     {12288,0x16 }, {14336,0x3A }, {15360,0x17 }, {16384,0x3B },
     {18432,0x18 }, {20480,0x19 }, {24576,0x1A }, {28672,0x3E },
     {30720,0x1B }, {32768,0x3F }, {36864,0x1C }, {40960,0x1D },
     {49152,0x1E }, {61440,0x1F }
 #elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
     { 768, 0x31 }
 #endif
   };
 
   if (divider <= 0) {
     sc = RTEMS_INVALID_NUMBER;
   }
 
   if (sc == RTEMS_SUCCESSFUL) {
     sc = RTEMS_INVALID_NUMBER;
     for (i = 0, fdr_val = -1; i < sizeof(dividers)/sizeof(dividers[0]); i++) {
       fdr_val = dividers[i].fdr_val;
       if (dividers[i].divider >= divider)
     {
       sc = RTEMS_SUCCESSFUL;
       *result = fdr_val;
       break;
     }
     }
   }
   return sc;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static int mpc83xx_i2c_wait
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   wait for i2c to become idle                                             |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  mpc83xx_i2c_softc_t *softc_ptr,          /* handle              */
  uint8_t              desired_status,     /* desired status word */
  uint8_t              status_mask         /* status word mask    */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    o = ok or error code                                                   |
 \*=========================================================================*/
 {
   uint8_t act_status;
   rtems_status_code rc;
   uint32_t tout;
 
 #if defined(DEBUG)
   printk("mpc83xx_i2c_wait called... ");
 #endif
 
   if (softc_ptr->initialized) {
     /*
      * enable interrupt mask
      */
     softc_ptr->reg_ptr->i2ccr |= I2CCR_MIEN;
     rc = rtems_semaphore_obtain(softc_ptr->irq_sema_id,RTEMS_WAIT,100);
     if (rc != RTEMS_SUCCESSFUL) {
       return rc;
     }
   }
   else {
     tout = 0;
     do {
       if (tout++ > 1000000) {
 #if defined(DEBUG)
     printk("... exit with RTEMS_TIMEOUT\r\n");
 #endif
     return RTEMS_TIMEOUT;
       }
     } while (!(softc_ptr->reg_ptr->i2csr & I2CSR_MIF));
   }
   softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MIEN;
 
   act_status = softc_ptr->reg_ptr->i2csr;
   if ((act_status  & status_mask) != desired_status) {
 #if defined(DEBUG)
     printk("... exit with RTEMS_IO_ERROR\r\n");
 #endif
     return RTEMS_IO_ERROR;
   }
 #if defined(DEBUG)
     printk("... exit OK\r\n");
 #endif
   return RTEMS_SUCCESSFUL;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static void mpc83xx_i2c_irq_handler
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   handle interrupts                                                       |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  rtems_irq_hdl_param handle     /* handle, is softc_ptr structure          */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    <none>                                                                 |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = (mpc83xx_i2c_softc_t *)handle;
 
   /*
    * clear IRQ flag
    */
   #if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
     softc_ptr->reg_ptr->i2csr &= ~I2CSR_MIF;
   #elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
     softc_ptr->reg_ptr->i2csr = I2CSR_MIF;
   #endif
 
   /*
    * disable interrupt mask
    */
   softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MIEN;
   if (softc_ptr->initialized) {
     rtems_semaphore_release(softc_ptr->irq_sema_id);
   }
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static void mpc83xx_i2c_irq_on_off
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   enable/disable interrupts (void, handled at different position)         |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  const
  rtems_irq_connect_data *irq_conn_data   /* irq connect data                */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    <none>                                                                 |
 \*=========================================================================*/
 {
 }
 
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static int mpc83xx_i2c_irq_isOn
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   check state of interrupts, void, done differently                       |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  const
  rtems_irq_connect_data *irq_conn_data  /* irq connect data                */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    TRUE, if enabled                                                       |
 \*=========================================================================*/
 {
   return (TRUE);
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static void mpc83xx_i2c_install_irq_handler
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   (un-)install the interrupt handler                                      |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  mpc83xx_i2c_softc_t *softc_ptr,        /* ptr to control structure        */
  int install                            /* TRUE: install, FALSE: remove    */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    <none>                                                                 |
 \*=========================================================================*/
 {
   rtems_status_code rc = RTEMS_SUCCESSFUL;
 
   rtems_irq_connect_data irq_conn_data = {
     softc_ptr->irq_number,
     mpc83xx_i2c_irq_handler,           /* rtems_irq_hdl           */
     (rtems_irq_hdl_param)softc_ptr,    /* (rtems_irq_hdl_param)   */
     mpc83xx_i2c_irq_on_off,            /* (rtems_irq_enable)      */
     mpc83xx_i2c_irq_on_off,            /* (rtems_irq_disable)     */
     mpc83xx_i2c_irq_isOn               /* (rtems_irq_is_enabled)  */
   };
 
   /*
    * (un-)install handler for I2C device
    */
   if (install) {
     /*
      * create semaphore for IRQ synchronization
      */
     rc = rtems_semaphore_create(rtems_build_name('i','2','c','s'),
                 0,
                 RTEMS_FIFO
                 | RTEMS_SIMPLE_BINARY_SEMAPHORE,
                 0,
                 &softc_ptr->irq_sema_id);
     if (rc != RTEMS_SUCCESSFUL) {
       rtems_panic("I2C: cannot create semaphore");
     }
     if (!BSP_install_rtems_irq_handler (&irq_conn_data)) {
       rtems_panic("I2C: cannot install IRQ handler");
     }
   }
   else {
     if (!BSP_remove_rtems_irq_handler (&irq_conn_data)) {
       rtems_panic("I2C: cannot uninstall IRQ handler");
     }
     /*
      * delete sync semaphore
      */
     if (softc_ptr->irq_sema_id != 0) {
       rc = rtems_semaphore_delete(softc_ptr->irq_sema_id);
       if (rc != RTEMS_SUCCESSFUL) {
     rtems_panic("I2C: cannot delete semaphore");
       }
     }
   }
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static rtems_status_code mpc83xx_i2c_init
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   initialize the driver                                                   |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  rtems_libi2c_bus_t *bh                  /* bus specifier structure        */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    o = ok or error code                                                   |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
   uint8_t fdr_val;
   int errval;
 #if defined(DEBUG)
   printk("mpc83xx_i2c_init called... ");
 #endif
   /*
    * init HW registers
    */
   /*
    * init frequency divider to 100kHz
    */
   errval = mpc83xx_i2c_find_clock_divider(&fdr_val,
                       softc_ptr->base_frq/100000);
   if (errval != 0) {
     return errval;
   }
   softc_ptr->reg_ptr->i2cfdr = fdr_val;
   /*
    * init digital filter sampling rate
    */
   softc_ptr->reg_ptr->i2cdfsrr = 0x10 ; /* no special filtering needed */
   /*
    * set own slave address to broadcast (0x00)
    */
   softc_ptr->reg_ptr->i2cadr = 0x00 ;
 
   /*
    * set control register to module enable
    */
   #if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
     softc_ptr->reg_ptr->i2ccr = I2CCR_MEN;
   #elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
     softc_ptr->reg_ptr->i2ccr = 0;
   #endif
 
   /*
    * init interrupt stuff
    */
   mpc83xx_i2c_install_irq_handler(softc_ptr,TRUE);
 
   /*
    * mark, that we have initialized
    */
   softc_ptr->initialized = TRUE;
 #if defined(DEBUG)
   printk("... exit OK\r\n");
 #endif
   return RTEMS_SUCCESSFUL;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static rtems_status_code mpc83xx_i2c_send_start
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   send a start condition to bus                                           |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  rtems_libi2c_bus_t *bh                  /* bus specifier structure        */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    o = ok or error code                                                   |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
 
 #if defined(DEBUG)
   printk("mpc83xx_i2c_send_start called... ");
 #endif
   if (0 != (softc_ptr->reg_ptr->i2ccr & I2CCR_MSTA)) {
     /*
      * already started, so send a "repeated start"
      */
     softc_ptr->reg_ptr->i2ccr |= I2CCR_RSTA;
   }
   else {
     softc_ptr->reg_ptr->i2ccr |= I2CCR_MSTA;
   }
 
 #if defined(DEBUG)
   printk("... exit OK\r\n");
 #endif
   return 0;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static rtems_status_code mpc83xx_i2c_send_stop
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   send a stop condition to bus                                            |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  rtems_libi2c_bus_t *bh                  /* bus specifier structure        */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    o = ok or error code                                                   |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
 
 #if defined(DEBUG)
   printk("mpc83xx_i2c_send_stop called... ");
 #endif
   softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MSTA;
   /*
    * wait, 'til stop has been executed
    */
   while (0 != (softc_ptr->reg_ptr->i2csr & I2CSR_MBB)) {
     rtems_task_wake_after(RTEMS_YIELD_PROCESSOR);
   }
 #if defined(DEBUG)
   printk("... exit OK\r\n");
 #endif
   return 0;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static rtems_status_code mpc83xx_i2c_send_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                                                   |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
   uint8_t addr_byte;
   rtems_status_code rc;
 
 #if defined(DEBUG)
   printk("mpc83xx_i2c_send_addr called... ");
 #endif
   softc_ptr->reg_ptr->i2ccr |= I2CCR_MTX;
   /*
    * determine, whether short or long address is needed, determine rd/wr
    */
   if (addr > 0x7f) {
     addr_byte = (0xf0
          | ((addr >> 7) & 0x06)
          | ((rw) ? 1 : 0));
     /*
      * send first byte
      */
     softc_ptr->reg_ptr->i2cdr = addr_byte;
     /*
      * wait for successful transfer
      */
     rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | I2CSR_RXAK);
     if (rc != RTEMS_SUCCESSFUL) {
 #if defined(DEBUG)
       printk("... exit rc=%d\r\n",rc);
 #endif
       return rc;
     }
   }
   /*
    * send (final) byte
    */
   addr_byte = ((addr << 1)
            | ((rw) ? 1 : 0));
 
   softc_ptr->reg_ptr->i2cdr = addr_byte;
   /*
    * wait for successful transfer
    */
   rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | I2CSR_RXAK);
 
 #if defined(DEBUG)
   printk("... exit rc=%d\r\n",rc);
 #endif
   return rc;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static int mpc83xx_i2c_read_bytes
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   receive some bytes from I2C device                                      |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
  unsigned char *buf,                     /* buffer to store bytes          */
  int len                                 /* number of bytes to receive     */
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    number of bytes received or (negative) error code                      |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
   rtems_status_code rc;
   unsigned char *p = buf;
 
 #if defined(DEBUG)
   printk("mpc83xx_i2c_read_bytes called... ");
 #endif
   softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MTX;
   softc_ptr->reg_ptr->i2ccr &= ~I2CCR_TXAK;
   /*
    * FIXME: do we need to deactivate TXAK from the start,
    * when only one byte is to be received?
    */
   /*
    * we need a dummy transfer here to start the first read
    */
   softc_ptr->reg_ptr->i2cdr;
 
   while (len-- > 0) {
     if (len == 0) {
       /*
        * last byte is not acknowledged
        */
       softc_ptr->reg_ptr->i2ccr |= I2CCR_TXAK;
     }
     /*
      * wait 'til end of transfer
      */
     rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF);
     if (rc != RTEMS_SUCCESSFUL) {
 #if defined(DEBUG)
       printk("... exit rc=%d\r\n",-rc);
 #endif
       return -rc;
     }
     *p++ = softc_ptr->reg_ptr->i2cdr;
 
   }
 
  /*
   * wait 'til end of last transfer
   */
   rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF);
 
 #if defined(DEBUG)
   printk("... exit OK, rc=%d\r\n",p-buf);
 #endif
   return p - buf;
 }
 
 /*=========================================================================*\
 | Function:                                                                 |
 \*-------------------------------------------------------------------------*/
 static int mpc83xx_i2c_write_bytes
 (
 /*-------------------------------------------------------------------------*\
 | Purpose:                                                                  |
 |   send some bytes to I2C device                                           |
 +---------------------------------------------------------------------------+
 | Input Parameters:                                                         |
 \*-------------------------------------------------------------------------*/
  rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
  unsigned char *buf,                     /* buffer to send                 */
  int len                                 /* number of bytes to send        */
 
 )
 /*-------------------------------------------------------------------------*\
 | Return Value:                                                             |
 |    number of bytes sent or (negative) error code                          |
 \*=========================================================================*/
 {
   mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
   rtems_status_code rc;
   unsigned char *p = buf;
 
 #if defined(DEBUG)
   printk("mpc83xx_i2c_write_bytes called... ");
 #endif
   softc_ptr->reg_ptr->i2ccr =
     (softc_ptr->reg_ptr->i2ccr & ~I2CCR_TXAK) | I2CCR_MTX;
   while (len-- > 0) {
     int rxack = len != 0 ? I2CSR_RXAK : 0;
 
     softc_ptr->reg_ptr->i2cdr = *p++;
     /*
      * wait 'til end of transfer
      */
     rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | rxack);
     if (rc != RTEMS_SUCCESSFUL) {
 #if defined(DEBUG)
       printk("... exit rc=%d\r\n",-rc);
 #endif
       return -rc;
     }
   }
 #if defined(DEBUG)
   printk("... exit OK, rc=%d\r\n",p-buf);
 #endif
   return p - buf;
 }
 
 rtems_libi2c_bus_ops_t mpc83xx_i2c_ops = {
   .init = mpc83xx_i2c_init,
   .send_start = mpc83xx_i2c_send_start,
   .send_stop = mpc83xx_i2c_send_stop,
   .send_addr = mpc83xx_i2c_send_addr,
   .read_bytes = mpc83xx_i2c_read_bytes,
   .write_bytes = mpc83xx_i2c_write_bytes,
 };
 

This page was automatically generated by the 2.3.7 LXR engine. The LXR team