smi.s.svn-base

Spearhead2000 的 USB驱动程序

        AREA SRAMC, CODE, READONLY
	
;  /*****************************************************************************
;   *                                                                           *
;   * Defines for Serial Flash Controller.                                      *
;   *                                                                           *
;   *****************************************************************************/
;

; /* SMEMC Base Address */
; #define       SRAMC   ((UINT32 *) (0x1000F000))
;
SMI_BASE           EQU     0x1000F000


; /* SRAMC Regions offset */
; #define       SMI_CR1   0x00
; #define       SMI_CR2   0x04
; #define       SMI_SR	  0x08
; #define       SMI_TR	  0x0C
; #define       SMI_RR	  0x10
;
SMI_CR1      EQU     0x00
SMI_CR2      EQU     0x04
SMI_SR       EQU     0x08
SMI_TR	     EQU     0x0C
SMI_RR	     EQU     0x10

; /* SMI Registers values */
; define  SMI_CR1 to boot:
;	Reserved     2b00
;	WBM	     1b0
;	SW	     1b0
;	ADD_LENGHT   0x0
;	HOLD	     0x00
;	FAST	     1b0
;	PRESC	     7b000 1000 -- 133MHz/8 = 16.63MHz
;	TCS	     0x5
;	BE	     0x1 
;

CR1_BOOT_NO_FAST EQU 0x00000851	
CR1_BOOT_FAST    EQU 0x00008351	; PRESC 7b000 0011


; /* SMI Registers values */
; define  SMI_CR2 to boot:
;	Reserved     18x00000
;       BS           2b00
;       WEN          1b0
;       RSR          1b0
;       WCIE         1b0
;       TFIE         1b0
;       SEND         1b0
;       REC_LENGTH   3b000
;       Reserved     1b0
;       TRA_LENGTH   3b000 



CR2_BOOT EQU 0x00000000	


	EXPORT SMI_init

;/*************************************************************************/
;/*                                                                       */
;/* FUNCTION                                                              */
;/*                                                                       */
;/*      void SMI_init (void)                                           */
;/*                                                                       */
;/* DESCRIPTION                                                           */
;/*                                                                       */
;/*      This routine initializes the SFLASH Controller.                    */
;/*                                                                       */
;/* AUTHOR                                                                */
;/*                                                                       */
;/*      C. Parrella - ST Microelectronics                                */
;/*                                                                       */
;/* CALLED BY                                                             */
;/*                                                                       */
;/*      INT_Initialize                                                   */
;/*                                                                       */
;/* CALLS                                                                 */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/* INPUTS                                                                */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/*                                                                       */
;/* OUTPUTS                                                               */
;/*                                                                       */
;/*      None                                                             */
;/*************************************************************************/
;VOID  SMI_init(void)
;{

SMI_init ROUT

; The SMI controller is configured to booting from external Flash:	
;    boot	<=  '1' -- External memory boot from bank0
;    bank0_type <=  '0' -- For Flash Address length (3 byte)
; In this way at reset the SMI is in Hardware Mode, both SMI_RR 
; and SMI_TR must not be accessed. Into others registers we write  
; the values at reset for read from external flash at max 20MHz from bank0
; 
    
    ; Load SMI Base Address
    ;
    LDR     a1, =SMI_BASE
 
    ; /*
    ;  * Bank 0
    ;  *  00001111 Rom0_SIZE : 1MB
    ;  *    00 Reserved 
    ;  *     1 BANKENABLE: bank enabled
    ;  *   010 C_LENGTH  : Data phase length 0f 4 CLK
    ;  *    01 B_SIZE    : bus size 16 bit
    ;  */
    ;
    ;
    LDR     a2, =SMI_CR1
    LDR     a3, =CR1_BOOT_FAST
    STR     a3, [a1, a2]
 
    ; /*
    ;  * Disable bank1
    ;  */
    ;
    ;
    LDR     a2, =SMI_CR2       
    LDR     a3, =CR2_BOOT
    STR    a3, [a1, a2]
 

    ;   return();
    ;                          
    MOV     pc, lr
;}

	END