boot.c

Epson系列芯片开发的例子

/************************************************************************
 *									*
 *	Copyright (C) SEIKO EPSON CORP. 2002				*
 *									*
 *	File name: boot.c						*
 *	  This is boot program for E0C33209.				*
 *									*
 *	Revision history						*
 *		2002.04.28	Andrew Yin	Start.			*
  *									*
 ************************************************************************/

#include "bcu.h"
#include "idma.h"
#include "int.h"

/* Prototype */
void vInitBcu( void );
void vInitInt( void );
void vIntBoot( void );

/*************************************************************************************************
 * vIntBoot
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	Boot program.
 *************************************************************************************************/
void vIntBoot( void )
{
	asm("xld.w	%r8,0x2000");	// Set SP in end of 8KB internal RAM
	asm("ld.w	%sp,%r8");
	asm("ld.w	%r8,0b10000");	// Set PSR to interrupt enable
	asm("ld.w	%psr,%r8");
	asm("xld.w	%r8,0x0");	// Set GPR is 0x0
	
	vInitBcu();			// Initialize BCU on boot time
	vInitInt();			// Initialize interrupt controller
	main();				// Call main
}

/**************************************************************************************************************
 * vInitBcu
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	Initialize BCU.
 **************************************************************************************************************/
void vInitBcu( void )
{
	// [0x4812E] bus control register setting: BCLK output enable; Burst ROM burst length is 8; 
	// external interface method is #BSL system; #WAIT pin enable.
	*(volatile unsigned short *)BCU_SWAITE_ADDR = BCU_RBCLK_ENA | BCU_RBST8_8 | BCU_SBUSST_BSL | BCU_SWAITE_ENA;
	
	// [0x48130] DRAM timing setup register setting: CEFUNC1 = '1' CEFUNC0 = 'x'.
	*(volatile unsigned short *)BCU_RASC_ADDR =  BCU_CEFUNC_COM;
	
	// [48120] Areas 15-18 setup register setting: (15 and 16 )Device size 16 bits, Output disable delay 0.5, Wait control 2.
	*(volatile unsigned short *)BCU_A15_A18_ADDR = BCU_SZH_16 | BCU_DFH_05 | BCU_WTH_2;

	// [0x48122] Areas 13-14 setup register setting: device size 16 bits ，Output disable delay 2.5，Wait control 2.
	*(volatile unsigned short *)BCU_A13_A14_ADDR = BCU_SZL_16 | BCU_DFL_05 | BCU_WTL_2;
	
	// [0x48124] Areas 11-12( 0x1000000~0x17FFFFF; 0x1800000~1FFFFFF ) setup register setting: device size 16 bits ，Output disable delay 2.5，Wait control 2.
	*(volatile unsigned short *)BCU_A11_A12_ADDR = BCU_SZL_16 | BCU_DFL_25 | BCU_WTL_2;
	
	// [0x48126] Area 9-10 setup register setting: device size 16 bits, output disable delay 0.5, wait control 2
	*(volatile unsigned short *)BCU_A9_A10_ADDR = BCU_SZL_16 | BCU_DFL_05 | BCU_WTL_2;
	
	// [0x48126] Area 9-10 setup register setting: device size 16 bits, output disable delay 0.5, wait control 2, area 9,10 use burst mode, burst wait cycle is 1
//	*(volatile unsigned short *)BCU_A9_A10_ADDR = BCU_SZL_16 | BCU_DFL_05 | BCU_WTL_2 | BCU_BROH_USE | BCU_BROL_USE | BCU_BW_1;
	
	// [0x48128] Area 7-8( 0x400000~0x5FFFFF; 0x600000~0x7FFFFF ) setup register setting: Device size 16 bits, output disable delay 3.5, wait control 7, DRAM is not used in area 8
	*(volatile unsigned short *)BCU_A7_A8_ADDR = BCU_DRAH_NOT | BCU_DRAL_NOT | BCU_SZL_16 | BCU_DFL_05 | BCU_WTL_0;

	// [0x4812A] Area 4-6 setup register setting: Device size 16 bits, output disable delay 3.5, wait control 7 in area 4,5,6
	*(volatile unsigned short *)BCU_A4_A5_A6_ADDR = BCU_DFH_35 | BCU_WTH_7 | BCU_SZL_16 | BCU_DFL_35 | BCU_WTL_7;
	
	// [4813A] BCLK select register setting: area1 access speed is 2 cycles when use x2speed mode, BCLK output PLL CLK
	*(volatile unsigned short *)BCU_BCLKSEL_ADDR = BCU_BCLKSEL_PLL | BCU_A1X1MD;
}
	
/*******************************************************************************
 * vInitInt
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	Initialize interrupt controller.
 *******************************************************************************/
void vInitInt( void )
{
        // Disable all interrupt enable register
	*(volatile unsigned char *)INT_EP0_EK_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_EHDM_EIDM_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_E16T0_E16T1_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_E16T2_E16T3_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_E16T4_E16T5_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_E8TU_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_ES_ADDR = INT_ENABLE_DIS;
	*(volatile unsigned char *)INT_EADE_ECTM_EP4_ADDR = INT_ENABLE_DIS;

	// Reset all interrupt cause flag register (interrupt factor flag reset is read only mode)
	*(volatile unsigned char *)INT_FP0_FK_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_FHDM_FIDM_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_F16T0_F16T1_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_F16T2_F16T3_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_F16T4_F16T5_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_F8TU_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_FS_ADDR = INT_FLAG_RST;
	*(volatile unsigned char *)INT_FADE_FCTM_FP4_ADDR = INT_FLAG_RST;

	// Set all interrupt IDMA request register CPU request disable
	*(volatile unsigned char *)INT_RP0_RHDM_R16T0_ADDR = INT_RIDMA_DIS;
	*(volatile unsigned char *)INT_R16T1_R16T4_ADDR = INT_RIDMA_DIS;
	*(volatile unsigned char *)INT_R16T5_R8TU_RS0_ADDR = INT_RIDMA_DIS;
	*(volatile unsigned char *)INT_RS1_RADE_RP4_ADDR = INT_RIDMA_DIS;

	// Set all IDMA disable
	*(volatile unsigned char *)IDMA_DEP0_DEHDM_DE16T0_ADDR = IDMA_DEIDMA_DIS;
	*(volatile unsigned char *)IDMA_DE16T1_DE16T4_ADDR = IDMA_DEIDMA_DIS;
	*(volatile unsigned char *)IDMA_DE16T5_DE8TU_DES0_ADDR = IDMA_DEIDMA_DIS;
	*(volatile unsigned char *)IDMA_DES1_DEADE_DEP4_ADDR = IDMA_DEIDMA_DIS;
}