iic_saa9730.c

MIPS下的boottloader yamon 的源代码

/************************************************************************
 *
 *      IIC_SAA9730.c
 *
 *      The 'IIC_SAA9730' module implements the IIC device driver
 *      interface to be used via 'IIC' device driver services:
 *
 *        1) init  serial device:  configure and initialize IIC driver
 *        2) open  serial device:  not used
 *        3) close serial device:  not used
 *        4) read  serial device:  read IIC device
 *        5) write serial device:  write IIC device
 *        6) ctrl  serial device:  a) write+read IIC device
 *                                 b) test IIC device
 *
 *
 *
 * ######################################################################
 *
 * Copyright (c) 1999-2000 MIPS Technologies, Inc. All rights reserved. 
 * 
 * Unpublished rights reserved under the Copyright Laws of the United States of 
 * America. 
 * 
 * This document contains information that is proprietary to MIPS Technologies, 
 * Inc. ("MIPS Technologies"). Any copying, modifying or use of this information 
 * (in whole or in part) which is not expressly permitted in writing by MIPS 
 * Technologies or a contractually-authorized third party is strictly 
 * prohibited. At a minimum, this information is protected under unfair 
 * competition laws and the expression of the information contained herein is 
 * protected under federal copyright laws. Violations thereof may result in 
 * criminal penalties and fines. 
 * MIPS Technologies or any contractually-authorized third party reserves the 
 * right to change the information contained in this document to improve 
 * function, design or otherwise. MIPS Technologies does not assume any 
 * liability arising out of the application or use of this information. Any 
 * license under patent rights or any other intellectual property rights owned 
 * by MIPS Technologies or third parties shall be conveyed by MIPS Technologies 
 * or any contractually-authorized third party in a separate license agreement 
 * between the parties. 
 * The information contained in this document constitutes one or more of the 
 * following: commercial computer software, commercial computer software 
 * documentation or other commercial items. If the user of this information, or 
 * any related documentation of any kind, including related technical data or 
 * manuals, is an agency, department, or other entity of the United States 
 * government ("Government"), the use, duplication, reproduction, release, 
 * modification, disclosure, or transfer of this information, or any related 
 * documentation of any kind, is restricted in accordance with Federal 
 * Acquisition Regulation 12.212 for civilian agencies and Defense Federal 
 * Acquisition Regulation Supplement 227.7202 for military agencies. The use of 
 * this information by the Government is further restricted in accordance with 
 * the terms of the license agreement(s) and/or applicable contract terms and 
 * conditions covering this information from MIPS Technologies or any 
 * contractually-authorized third party. 
 *
 ************************************************************************/




/************************************************************************
 *      Include files
 ************************************************************************/

#include <sysdefs.h>
#include <syserror.h>
#include <sysdev.h>
#include <io_api.h>
#include <syscon_api.h>
#include <iic_api.h>
#include <iic_saa9730_api.h>

#include <string.h>

/************************************************************************
 *      Definitions
 ************************************************************************/

#define IIC_TIMEOUT                 1000 /* IIC-bus command timeout ms. */

#define IIC_READCMD                 TRUE
#define IIC_WRITECMD                FALSE

/************************************************************************
 *  IIC port: Relative Register Addresses
*************************************************************************/

#define IIC_TFR_OFS       0x2400 /* IIC port: Transfer register         */
#define IIC_STC_OFS       0x2404 /* IIC port: Status and control reg.   */

/************************************************************************
 *  IIC port: Register field encodings
*************************************************************************/

/******** reg: TFR ********/

/* field: BYTE2 */
#define IIC_TFR_BYTE2_SHF        24
#define IIC_TFR_BYTE2_MSK        (MSK(8) << IIC_TFR_BYTE2_SHF)
#define IIC_TFR_BYTE2_SET        IIC_TFR_BYTE2_MSK

/* field: BYTE1 */
#define IIC_TFR_BYTE1_SHF        16
#define IIC_TFR_BYTE1_MSK        (MSK(8) << IIC_TFR_BYTE1_SHF)
#define IIC_TFR_BYTE1_SET        IIC_TFR_BYTE1_MSK

/* field: BYTE0 */
#define IIC_TFR_BYTE0_SHF        8
#define IIC_TFR_BYTE0_MSK        (MSK(8) << IIC_TFR_BYTE0_SHF)
#define IIC_TFR_BYTE0_SET        IIC_TFR_BYTE0_MSK

/* field: BYTE2ATTR */
#define IIC_TFR_BYTE2ATTR_SHF    6
#define IIC_TFR_BYTE2ATTR_MSK    (MSK(2) << IIC_TFR_BYTE2ATTR_SHF)
#define IIC_TFR_BYTE2ATTR_SET    IIC_TFR_BYTE2ATTR_MSK

/* field: BYTE1ATTR */
#define IIC_TFR_BYTE1ATTR_SHF    4
#define IIC_TFR_BYTE1ATTR_MSK    (MSK(2) << IIC_TFR_BYTE1ATTR_SHF)
#define IIC_TFR_BYTE1ATTR_SET    IIC_TFR_BYTE1ATTR_MSK

/* field: BYTE0ATTR */
#define IIC_TFR_BYTE0ATTR_SHF    2
#define IIC_TFR_BYTE0ATTR_MSK    (MSK(2) << IIC_TFR_BYTE0ATTR_SHF)
#define IIC_TFR_BYTE0ATTR_SET    IIC_TFR_BYTE0ATTR_MSK

/* field: ERR */
#define IIC_TFR_ERR_SHF          1
#define IIC_TFR_ERR_MSK          (MSK(1) << IIC_TFR_ERR_SHF)
#define IIC_TFR_ERR_SET          IIC_TFR_ERR_MSK

/* field: BUSY */
#define IIC_TFR_BUSY_SHF         0
#define IIC_TFR_BUSY_MSK         (MSK(1) << IIC_TFR_BUSY_SHF)
#define IIC_TFR_BUSY_SET         IIC_TFR_BUSY_MSK

/* Values for BYTExATTR fields: */
#define IIC_TFR_BYTEATTR_NOP     0x0
#define IIC_TFR_BYTEATTR_STOP    0x1
#define IIC_TFR_BYTEATTR_CONT    0x2
#define IIC_TFR_BYTEATTR_START   0x3

/******** reg: STC ********/

/* field: CLK */
#define IIC_STC_CLK_SHF          8
#define IIC_STC_CLK_MSK          (MSK(3) << IIC_STC_CLK_SHF)
#define IIC_STC_CLK_SET          IIC_STC_CLK_MSK

/* field: IRQ */
#define IIC_STC_IRQ_SHF          7
#define IIC_STC_IRQ_MSK          (MSK(1) << IIC_STC_IRQ_SHF)
#define IIC_STC_IRQ_SET          IIC_STC_IRQ_MSK

/* field: APERR */
#define IIC_STC_APERR_SHF        5
#define IIC_STC_APERR_MSK        (MSK(1) << IIC_STC_APERR_SHF)
#define IIC_STC_APERR_SET        IIC_STC_APERR_MSK

/* field: DTERR */
#define IIC_STC_DTERR_SHF        4
#define IIC_STC_DTERR_MSK        (MSK(1) << IIC_STC_DTERR_SHF)
#define IIC_STC_DTERR_SET        IIC_STC_DTERR_MSK

/* field: ERR */
#define IIC_STC_ERR_SHF          1
#define IIC_STC_ERR_MSK          (MSK(1) << IIC_STC_ERR_SHF)
#define IIC_STC_ERR_SET          IIC_STC_ERR_MSK

/* field: BUSY */
#define IIC_STC_BUSY_SHF         0
#define IIC_STC_BUSY_MSK         (MSK(1) << IIC_STC_BUSY_SHF)
#define IIC_STC_BUSY_SET         IIC_STC_BUSY_MSK

/* Values for CLK field: */
#define IIC_STC_CLK_5156HZ       0x05
#define IIC_STC_CLK_10312HZ      0x01
#define IIC_STC_CLK_68750HZ      0x04
#define IIC_STC_CLK_103125HZ     0x06
#define IIC_STC_CLK_275000HZ     0x00
#define IIC_STC_CLK_412500HZ     0x02



/*
    IIC Command Buffer 
                                                                        */
typedef struct IIC_SAA9730_cmd_buffer
{
    UINT8 data[3];              /* Byte2, Byte1, Byte0 */
    UINT8 attrib;               /* Attributes for Byte2, Byte1, Byte0  */
    UINT8 index;                /* Current index, 0 = Byte2,..         */
    UINT8 *pread[3];            /* Pointers for storing read data      */
} t_IIC_SAA9730_cmd_buffer ;


/************************************************************************
 *  Macro Definitions
*************************************************************************/


/************************************************************************
 *      Public variables
 ************************************************************************/



/************************************************************************
 *      Static variables
 ************************************************************************/

/*
    IIC Command Buffer 
*/
static t_IIC_SAA9730_cmd_buffer buf ;

/*
    9730 base register address 
*/
static void *saa9730base ;

/************************************************************************
 *      Static function prototypes
 ************************************************************************/

/************************************************************************
 *      Driver services:
 ************************************************************************/


/************************************************************************
 *
 *                          IIC_SAA9730_init
 *  Description :
 *  -------------
 *  This service initializes the IIC driver and configures
 *  the IIC-bus speed via the 'syscon' parameter:
 *
 *  'SYSCON_COM_IIC_BAUDRATE_ID'
 *  
 *
 *  Parameters :
 *  ------------
 *
 *  'major',     IN,    major device number
 *  'minor',     IN,    not used
 *  'p_param',   INOUT, not used
 *
 *
 *  Return values :
 *  ---------------
 *
 *  'OK'(=0)
 *
 *
 *
 ************************************************************************/
static
INT32 IIC_SAA9730_init(
          UINT32 major,          /* IN: major device number             */
          UINT32 minor,          /* IN: minor device number             */
          void   *p_param ) ;    /* INOUT: device parameter block       */


/************************************************************************
 *
 *                          IIC_SAA9730_read
 *  Description :
 *  -------------
 *  This service reads data from the specified IIC device into the
 *  user allocated variable, *p_param.
 *
 *  Parameters :
 *  ------------
 *
 *  'major',     IN,    major device number
 *  'minor',     IN,    minor device number for multi device drivers
 *  'p_param',   INOUT, variable of type, t_IIC_read_descriptor.
 *
 *
 *  Return values :
 *  ---------------
 *
 *  'OK' = 0x00:              IIC device data read into user variable
 *  'ERROR_IIC_COMM_ERROR':   communication error detected
 *
 *
 ************************************************************************/
static
INT32 IIC_SAA9730_read(
          UINT32 major,          /* IN: major device number             */
          UINT32 minor,          /* IN: minor device number             */
          t_IIC_read_descriptor *p_param ) ; /* INOUT: read buffer      */


/************************************************************************
 *
 *                          IIC_SAA9730_write
 *  Description :
 *  -------------
 *  This service writes user data to the specified IIC device.
 *
 *  
 *
 *  Parameters :
 *  ------------
 *
 *  'major',     IN,    major device number
 *  'minor',     IN,    minor device number for multi device drivers
 *  'p_param',   INOUT, variable of type, t_IIC_write_descriptor.
 *
 *
 *  Return values :
 *  ---------------
 *
 *  'OK' = 0x00:              IIC service completed successfully
 *  'ERROR_IIC_COMM_ERROR':   communication error detected
 *
 *
 ************************************************************************/
static
INT32 IIC_SAA9730_write(
          UINT32 major,          /* IN: major device number             */
          UINT32 minor,          /* IN: minor device number             */
          t_IIC_write_descriptor *p_param ) ; /* IN: write buffer       */


/************************************************************************
 *
 *                          IIC_SAA9730_ctrl
 *  Description :
 *  -------------
 *  This service comprise following aggregated IIC services:
 *   1) 'write_read' IIC device.
 *   2) 'test'       IIC device.
 *
 *  
 *
 *  Parameters :
 *  ------------
 *
 *  'major',     IN,    major device number
 *  'minor',     IN,    minor device number for multi device drivers
 *  'p_param',   INOUT, variable of type, t_IIC_ctrl_descriptor.
 *
 *
 *  Return values :
 *  ---------------
 *
 *  'OK' = 0x00:              IIC service completed successfully
 *  'ERROR_IIC_COMM_ERROR':   communication error detected
 *
 *
 ************************************************************************/
static
INT32 IIC_SAA9730_ctrl(
          UINT32 major,          /* IN: major device number             */
          UINT32 minor,          /* IN: minor device number             */
          t_IIC_ctrl_descriptor *p_param ) ; /* INOUT: IIC device data  */

/************************************************************************
 *      Local helper functions:
 ************************************************************************/

/************************************************************************
 *
 *                          IIC_SAA9730_reset
 *  Description :
 *  -------------
 *
 *  Reset command buffer
 *
 *
 *  Parameters :
 *  ------------
 *
 *  -
 *
 *  Return values :
 *  ---------------
 *
 *  -
 *
 *
 ************************************************************************/
static 
void IIC_SAA9730_reset( void ) ;


/************************************************************************
 *
 *                          IIC_SAA9730_check
 *  Description :
 *  -------------
 *
 *  Check status and control register for any detected errors.
 *
 *
 *  Parameters :
 *  ------------
 *
 *  -
 *
 *  Return values :
 *  ---------------
 *