sdram.s

COG-VP12864液晶屏驱动代码及对应RTC实例

#include "include\asm.h"
#include "include\mipsreg.h"
#include "include\cpureg.h"
#include "include\soc.h"
/* #include "cache.h" */

#define SDRAM_START     0xA0000000
#define SDRAM_BIT_9     0xA0000200
#define SDRAM_BIT_10    0xA0000400
#define SDRAM_BIT_11    0xA0000800
#define SDRAM_BIT_12    0xA0001000
#define SDRAM_BIT_20    0xA0100000
#define SDRAM_BIT_21    0xA0200000
#define SDRAM_BIT_22    0xA0400000
#define SDRAM_BIT_23    0xA0800000
#define SDRAM_BIT_24    0xA1000000
#define SDRAM_BIT_25    0xA2000000

#define SDRAM_16MB              0xA1000000 - 1
#define SDRAM_32MB              0xA2000000 - 1
#define SDRAM_64MB              0xA4000000 - 1
#define SDRAM_128MB             0xA8000000 - 1

#define CONFIG_EM_MASK  0x00c00000
#define CONFIG_EP_MASK  0x0f000000

#define SDTYPE_2_13_11				0xf
#define	SDTYPE_2_12_11              0xb
#define	SDTYPE_2_13_10              0xe
#define	SDTYPE_2_12_10              0xa
#define	SDTYPE_1_11_10              0x3
#define	SDTYPE_2_13_9               0xd
#define	SDTYPE_2_12_9               0x9
#define	SDTYPE_1_11_9               0x2
#define	SDTYPE_2_13_8               0xc
#define	SDTYPE_2_12_8               0x8
#define	SDTYPE_2_11_8               0x4
#define	SDTYPE_1_11_8               0x1
#define	SDTYPE_NOT_SUPPORTED        0x0

#define	CC_MC_SDTYPE				0xbff807d0

#define	SCU_SDRTR0	0xBFF807CA
#define	SCU_SDRTR1	0xBFF807CB
#define	SCU_SDRTYPE	0xBFF807D0
#define	SCU_SDRMR0	0xBFF807CC
#define	SCU_SDRMR1	0xBFF807CE
#define	SCU_SDRMR2	0xBFF807CD
#define	SCU_SDRMR3	0xBFF807CF

/*e.g. CHECK_BIT_N(SDRAM_BIT_10)
  if t9 == t8 ,bitn NOT exists
  else bitn exists
*/
#define	CHECK_BIT_N(bitn)		\
		nop;					\
		li	t9, 0x00000055;		\
		sb	t9, SDRAM_START;	\
		li	t9, 0x000000aa;		\
		sb	t9, bitn;			\
		li	t7, SDRAM_START;	\
		lb	t9, 0(t7);			\
		li	t3, bitn;			\
		lb	t8, 0(t7)
		
#define	SET_SDTYPE(sdtype)		\
		li	t9,sdtype;			\
		sw	t9,( CC_MC_SDTYPE )		

LEAF(InitSDRAMType)
	.set noreorder
/**************************Try_2_13_11******************************/	
Try_2_13_11:	
		SET_SDTYPE(SDTYPE_2_13_11)
Check_bit_12:		
		CHECK_BIT_N(SDRAM_BIT_12)
		beq	t8, t9, Try_2_13_10
		nop
Check_bit_25:
		nop
		CHECK_BIT_N(SDRAM_BIT_25)
		beq	t8, t9, Try_2_12_11
		nop
		li	v0,0x41
		b	TestDone
		nop

/**************************Try_2_12_11******************************/		
Try_2_12_11:
		SET_SDTYPE(SDTYPE_2_12_11)
Check_bit_24_1:
		CHECK_BIT_N(SDRAM_BIT_24)
		beq	t8, t9, SDRAM_NOT_FOUND
		nop
		li	v0,0x42
		b	TestDone
		nop

/**************************Try_2_13_10******************************/		
Try_2_13_10:
		SET_SDTYPE(SDTYPE_2_13_10)
Check_bit_11:
		CHECK_BIT_N(SDRAM_BIT_11)
		beq	t8, t9, Try_2_13_9
		nop
Check_bit_24_2:
		CHECK_BIT_N(SDRAM_BIT_24)
		beq	t8, t9, Try_2_12_10
		nop
		li	v0,0x43
		b	TestDone
		nop

/**************************Try_2_12_10******************************/
Try_2_12_10:
		SET_SDTYPE(SDTYPE_2_12_10)
Check_bit_23_1:
		CHECK_BIT_N(SDRAM_BIT_23)
		beq	t8, t9, Try_1_11_10
		nop
		li	v0,0x44
		b	TestDone
		nop

/**************************Try_1_11_10******************************/
Try_1_11_10:
		SET_SDTYPE(SDTYPE_1_11_10)
Check_bit_22_1:
		CHECK_BIT_N(SDRAM_BIT_22)
		beq	t8, t9, SDRAM_NOT_FOUND
		nop
		li	v0,0x45
		b	TestDone
		nop

/**************************Try_2_13_9******************************/
Try_2_13_9:
		SET_SDTYPE(SDTYPE_2_13_9)
Check_bit_10:
		CHECK_BIT_N(SDRAM_BIT_10)
		beq	t8, t9, Try_2_13_8
		nop
Check_bit_23_2:
		CHECK_BIT_N(SDRAM_BIT_23)
		beq	t8, t9, Try_2_12_9
		nop
		li	v0,0x46
		b	TestDone
		nop

/**************************Try_2_12_9******************************/
Try_2_12_9:
		SET_SDTYPE(SDTYPE_2_12_9)
Check_bit_22_2:
		CHECK_BIT_N(SDRAM_BIT_22)
		beq	t8, t9, Try_1_11_9
		nop
		li	v0,0x47
		b	TestDone
		nop

/**************************Try_1_11_9******************************/
Try_1_11_9:
		SET_SDTYPE(SDTYPE_1_11_9)
Check_bit_21_1:
		CHECK_BIT_N(SDRAM_BIT_21)
		beq	t8, t9, SDRAM_NOT_FOUND
		nop
		li	v0,0x48
		b	TestDone
		nop

/**************************Try_2_13_8******************************/
Try_2_13_8:
		SET_SDTYPE(SDTYPE_2_13_8)
Check_bit_9:
		CHECK_BIT_N(SDRAM_BIT_9)
		beq	t8, t9, SDRAM_NOT_FOUND
		nop
Check_bit_22_3:
		CHECK_BIT_N(SDRAM_BIT_22)
		beq	t8, t9, Try_2_12_8
		nop
		li	v0,0x49
		b	TestDone
		nop

/**************************Try_2_12_8******************************/
Try_2_12_8:
		SET_SDTYPE(SDTYPE_2_12_8)
Check_bit_21_2:
		CHECK_BIT_N(SDRAM_BIT_21)
		beq	t8, t9, Try_2_11_8
		nop
		li	v0,0x4a
		b	TestDone
		nop

/**************************Try_2_11_8******************************/
Try_2_11_8:
		SET_SDTYPE(SDTYPE_2_11_8)
Check_bit_20:
		CHECK_BIT_N(SDRAM_BIT_20)
		beq	t8, t9, SDRAM_NOT_FOUND
		nop
Check_bit_22_4:
		CHECK_BIT_N(SDRAM_BIT_22)
		li	v0,0x4b
		beq	t8, t9, TestDone
		nop

/**************************Try_1_11_8******************************/
Try_1_11_8:
		SET_SDTYPE(SDTYPE_1_11_8)
		li	v0,0x4c
		b	TestDone
		nop

SDRAM_NOT_FOUND:
		SET_SDTYPE(SDTYPE_NOT_SUPPORTED)
STOP_LOOP:
		b	STOP_LOOP
		nop
TestDone:
		jr	ra
		nop
	.end


    
/*
 * InitSDRAM : void InitSDRAM(char c)
 */
    LEAF(InitSDRAM)
.set noreorder
	li	a0,SCU_SDRTR0
/*	li	a1,0x1e			# 8M crystal */
	li	a1,0x12			# 5M crystal
	sb	a1,(a0)
	
	li	a0,SCU_SDRTR1
	li	a1,0x0
	sb	a1,(a0)

	
	li	a0,SCU_SDRTYPE
	li	a1,SDTYPE_2_12_9
	sb	a1,(a0)


	li	a0,SCU_SDRMR0
	li	a1,0x3b
	sb	a1,(a0)
	
	li	a0,SCU_SDRMR1
	li	a1,0x3
	sb	a1,(a0)
	
	li	a0,SCU_SDRMR2
	li	a1,0x80
	sb	a1,(a0)
	
    j   ra
    nop
    .end