kev7a400_enet_if_abs_driver.c

sharp的arm920t 7A400的评估板附带光盘Sharp KEVLH7A400 v0.3b Welcome to the SHARP KEV7A400 Evaluation board

/**********************************************************************
 *  $Workfile:   KEV7A400_enet_if_abs_driver.c  $
 *  $Revision:   1.1  $
 *  $Author:   MaysR  $
 *  $Date:   Aug 29 2002 08:59:52  $
 *
 *  Project: Interface functions for the CS8900 Ethernet controller.
 *
 *	Description:
 *      This file contains functions to directly control hardware 
 *      related to reading and writing data to the ethernet controller 
 *      on the IO board of the KEV7A400 EVB, or controlling functions 
 *      external to the ethernet controller. These functions were 
 *      segregated from the main ethernet packet driver to provide an 
 *      extra level of abstraction between the way the driver accesses 
 *      data in the ethernet controller and the actual accesses 
 *      themselves.
 *
 *      SPECIAL DRIVER REQUIREMENTS FOR SHARP
 *      At present, the Sharp KEV7A400 does not generate the needed 
 *      timing to access the CS8900A ethernet controller without 
 *      external logic.  The CS8900A requires a read strobe for each 
 *      data item read from the controller. Because the KEV7A400 reads 
 *      blocks of data by holding the chip select and read lines active 
 *      while only changing the address, the software driver must 
 *      perform a write function before any read of the controller for 
 *      data to be read correctly. A block of writes does not have this 
 *      restriction. In this driver sublayer, most reads will be 
 *      executed after a dummy write. (The dummy write will be an update
 *      of the PacketPage pointer, which a copy of is maintained and 
 *      used by the driver.
 *
 *  References:  LH7A400 User's Guide
 *
 *	Revision History:
 *  $Log:   //smaicnt2/pvcs/VM/CHIPS/archives/LH7A400/Ethernet/Drivers/KEV7A400_enet_if_abs_driver.c-arc  $
 * 
 *    Rev 1.1   Aug 29 2002 08:59:52   MaysR
 * Added int disable function.  Corrected error in int init.  Cleaned
 * up comments and completed some function banners.
 * 
 *    Rev 1.0   Aug 27 2002 11:41:04   MaysR
 * Initial revision.
 * 
 * 
 * SHARP MICROELECTRONICS OF THE AMERICAS MAKES NO REPRESENTATION
 * OR WARRANTIES WITH RESPECT TO THE PERFORMANCE OF THIS SOFTWARE,
 * AND SPECIFICALLY DISCLAIMS ANY RESPONSIBILITY FOR ANY DAMAGES, 
 * SPECIAL OR CONSEQUENTIAL, CONNECTED WITH THE USE OF THIS SOFTWARE.
 *
 * SHARP MICROELECTRONICS OF THE AMERICAS PROVIDES THIS SOFTWARE SOLELY 
 * FOR THE PURPOSE OF SOFTWARE DEVELOPMENT INCORPORATING THE USE OF A 
 * SHARP MICROCONTROLLER OR SYSTEM-ON-CHIP PRODUCT. USE OF THIS SOURCE
 * FILE IMPLIES ACCEPTANCE OF THESE CONDITIONS.
 *
 *	COPYRIGHT (C) 2001 SHARP MICROELECTRONICS OF THE AMERICAS, INC.
 *		CAMAS, WA
 *
 *********************************************************************/

#include "LH7A400_evb.h"
#include "LH7A400_map.h"
#include "LH7A400_gpio_driver.h"
#include "KEV7A400_enet_if_abs_driver.h"
#include "LH7A400_EVB_CPLD_driver.h"
#include <stdio.h>

/* There is a default ISR handler in the CS8900 driver named "enet_isr".
 * A user could simply call it, or the user must provide an ISR handler 
 * to service interrupts, or disable them.
*/
extern void KEV7A400_enet_isr(void);

// List of addresses for each read and write port
UNS_16 * const enet_port_addr[8] = {(UNS_16 *) 0x30000000,
                                    (UNS_16 *) 0x30000004, 
                                    (UNS_16 *) 0x30000008, 
                                    (UNS_16 *) 0x3000000C,   
                                    (UNS_16 *) 0x30000010, 
                                    (UNS_16 *) 0x30000014, 
                                    (UNS_16 *) 0x30000018,   
                                    (UNS_16 *) 0x3000001C};

/* If DUMMY_WRITE is set, a dummy write will occur prior to every read
 * See the function "dummy_write" for additional information.
*/
UNS_32 const dummy_write_en = 1;

/**********************************************************************
*
* Function: enet_if_mem_init
*
* Purpose:  Initialize the memory interface to the ethernet controller.
*  
* Processing:  The memory interface to the ethernet controller is 
*              initialized by setting up chip select 3 to the SRAM 
*              interface.
*  
* Parameters:  None
*
* Outputs:  None
*
* Returns:  Nothing
*
* Notes:  Set CS3 to 16 bit data size, no retry, 2 ws bus turn around 
*         time, 18 read/write wait states, and nWE enabled
*
**********************************************************************/
void enet_if_mem_init (void)
{
    SMC->bcr3 = SMC_BCR3_INIT;
}

/**********************************************************************
 *
 * Function:  enet_int_init
 *
 * Purpose:  
 *  
 * Processing:
 * 
 * Parameters:  None
 *
 * Outputs:  None
 *
 * Returns:  Nothing
 *
 * Notes:  None
 *
 *********************************************************************/
void enet_int_init (void)
{
    LH7A400_pld_init(WEAK);
    LH7A400_pld_irq_setup(INTC_GPIO1INTR_BIT, WEAK);
    LH7A400_pld_install_int_handler(CPLD_ETH_INT_BIT,
                                    CPLD_ETH_INT_PRIO,
                                    KEV7A400_enet_isr);
    LH7A400_pld_enable_ext_int(ETH_INT);
}    
                
/**********************************************************************
 *
 * Function:  enet_int_clear
 *
 * Purpose:  Clear an Ethernet Interrupt.
 *  
 * Processing: Clear the SoC interrupt and the CPLD interrupt.
 * 
 * Parameters:  None
 *
 * Outputs:  None
 *
 * Returns:  Nothing
 *
 * Notes:  None
 *
 *********************************************************************/
void enet_int_clear(void)
{
    gpio_interrupt_clear(INTC_GPIO1INTR_BIT);
    LH7A400_pld_clear_ext_int(ETH_INT);
}    
                
/**********************************************************************
 *
 * Function:  enet_int_disable
 *
 * Purpose:  Disable the Ethernet Interrupt.
 *  
 * Processing:  Disable the Ethernet Interrupt.
 * 
 * Parameters:  None
 *
 * Outputs:  None
 *
 * Returns:  Nothing
 *
 * Notes:  None
 *
 *********************************************************************/
void enet_int_disable(void)
{
    LH7A400_pld_disable_ext_int(ETH_INT);
}    
                
/**********************************************************************
*
* Function: enet_if_wakeup
*
* Purpose:  Disables the sleep signal going to the ethernet controller.
*
* Processing:
*	This function simply sets the ethernet sleep signal high by
*   setting the ethernet sleep bit high in the IO board power control
*   register.
*
* Parameters:  None
*
* Outputs:  None
*
* Returns:  Nothing
*
* Notes:  None
*
**********************************************************************/
void enet_if_wakeup (void)
{
    CPLD->control.wr_io_brd_ctl |= CPLD_ETH_SLEEP;
}

/**********************************************************************
*
* Function: enet_if_sleep
*
* Purpose:  Enables the sleep signal going to the ethernet controller.
*
* Processing:
*	This function simply sets the ethernet sleep signal low by
*   setting the ethernet sleep bit low in the IO board power control
*   register.
*
* Parameters:  None
*
* Outputs:  None
*
* Returns:  Nothing
*
* Notes:  None
*
**********************************************************************/
void enet_if_sleep (void)
{
    CPLD->control.wr_io_brd_ctl &= (~CPLD_ETH_SLEEP);
}