spi.c

武汉创维特公司的2410arm9开发办的can linux源代码

/*

Module Name:	SPI.CPP

Abstract:		SPI Interface Routines for Samsung SC2410 CPU
  
Notes:			Presently, only the SPI Channel 0 is supported.

Environment:	Samsung SC2410 CPU

Date: 			2004/01/28

By: 			Li zhongmin
   
*/

#include	<asm-arm/arch-s3c2410/S3C2410.h>
#include	<linux/delay.h>

//#include 	"2410addr.h"
#include 	"def.h"
#include 	"spi.h"
#include	"option.h"

volatile DWORD g_dwWaitCounter = 0;
//----------------------------------------------------------------------------------
//extern str[256];

// Used to wait the specified # of clock cycles
#define WAIT(x)		{ for(g_dwWaitCounter=0; g_dwWaitCounter<x; g_dwWaitCounter++); }				


void Port_Init(void)
{
    //CAUTION:Follow the configuration order for setting the ports. 
    // 1) setting value(GPnDAT) 
    // 2) setting control register  (GPnCON)
    // 3) configure pull-up resistor(GPnUP)  

    //32bit data bus configuration  
    //=== PORT A GROUP
    //Ports  : GPA22 GPA21  GPA20 GPA19 GPA18 GPA17 GPA16 GPA15 GPA14 GPA13 GPA12  
    //Signal : nFCE nRSTOUT nFRE   nFWE  ALE   CLE  nGCS5 nGCS4 nGCS3 nGCS2 nGCS1 
    //Binary :  1     1      1  , 1   1   1    1   ,  1     1     1     1
    //Ports  : GPA11   GPA10  GPA9   GPA8   GPA7   GPA6   GPA5   GPA4   GPA3   GPA2   GPA1  GPA0
    //Signal : ADDR26 ADDR25 ADDR24 ADDR23 ADDR22 ADDR21 ADDR20 ADDR19 ADDR18 ADDR17 ADDR16 ADDR0 
    //Binary :  1       1      1      1   , 1       1      1      1   ,  1       1     1      1         
    *(unsigned int *)rGPACON = 0x7fffff; 

    //===* PORT B GROUP
    //Ports  : GPB10    GPB9    GPB8    GPB7    GPB6     GPB5    GPB4   GPB3   GPB2     GPB1      GPB0
    //Signal : nXDREQ0 nXDACK0 nXDREQ1 nXDACK1 nSS_KBD nDIS_OFF L3CLOCK L3DATA L3MODE nIrDATXDEN Keyboard
    //Setting: INPUT  OUTPUT   INPUT  OUTPUT   INPUT   OUTPUT   OUTPUT OUTPUT OUTPUT   OUTPUT    OUTPUT 
    //Binary :   00  ,  01       00  ,   01      00   ,  01       01  ,   01     01   ,  01        01  
    *(unsigned int *)rGPBCON = 0x044555;
    *(unsigned int *)rGPBUP  = 0x7ff;     // The pull up function is disabled GPB[10:0]

    //=== PORT C GROUP
    //Ports  : GPC15 GPC14 GPC13 GPC12 GPC11 GPC10 GPC9 GPC8  GPC7   GPC6   GPC5 GPC4 GPC3  GPC2  GPC1 GPC0
    //Signal : VD7   VD6   VD5   VD4   VD3   VD2   VD1  VD0 LCDVF2 LCDVF1 LCDVF0 VM VFRAME VLINE VCLK LEND  
    //Binary :  10   10  , 10    10  , 10    10  , 10   10  , 10     10  ,  10   10 , 10     10 , 10   10
    *(unsigned int *)rGPCCON = 0xaaaaaaaa;       
    *(unsigned int *)rGPCUP  = 0xffff;     // The pull up function is disabled GPC[15:0] 

    //=== PORT D GROUP
    //Ports  : GPD15 GPD14 GPD13 GPD12 GPD11 GPD10 GPD9 GPD8 GPD7 GPD6 GPD5 GPD4 GPD3 GPD2 GPD1 GPD0
    //Signal : VD23  VD22  VD21  VD20  VD19  VD18  VD17 VD16 VD15 VD14 VD13 VD12 VD11 VD10 VD9  VD8
    //Binary : 10    10  , 10    10  , 10    10  , 10   10 , 10   10 , 10   10 , 10   10 ,10   10
    *(unsigned int *)rGPDCON = 0xaaaaaaaa;       
    *(unsigned int *)rGPDUP  = 0xffff;     // The pull up function is disabled GPD[15:0]

    //=== PORT E GROUP
    //Ports  : GPE15  GPE14 GPE13   GPE12   GPE11   GPE10   GPE9    GPE8     GPE7  GPE6  GPE5   GPE4  
    //Signal : IICSDA IICSCL SPICLK SPIMOSI SPIMISO SDDATA3 SDDATA2 SDDATA1 SDDATA0 SDCMD SDCLK I2SSDO 
    //Binary :  10     10  ,  10      10  ,  10      10   ,  10      10   ,   10    10  , 10     10  ,     
    //-------------------------------------------------------------------------------------------------------
    //Ports  :  GPE3   GPE2  GPE1    GPE0    
    //Signal : I2SSDI CDCLK I2SSCLK I2SLRCK     
    //Binary :  10     10  ,  10      10 
    *(unsigned int *)rGPECON = 0xaaaaaaaa;       
    *(unsigned int *)rGPEUP  = 0xffff;     // The pull up function is disabled GPE[15:0]

    //=== PORT F GROUP
    //Ports  : GPF7   GPF6   GPF5   GPF4      GPF3     GPF2  GPF1   GPF0
    //Signal : nLED_8 nLED_4 nLED_2 nLED_1 nIRQ_PCMCIA EINT2 KBDINT EINT0
    //Setting: Output Output Output Output    EINT3    EINT2 EINT1  EINT0
    //Binary :  01      01 ,  01     01  ,     10       10  , 10     10
//    *(unsigned int *)rGPFCON = 0x55aa;
    *(unsigned int *)rGPFCON = 0xaaaa;
    *(unsigned int *)rGPFUP  = 0xff;     // The pull up function is disabled GPF[7:0]

#if 0       // LIUSJ, Commented for AIJI
    //*** PORT G GROUP
    //Ports  : GPG15 GPG14 GPG13 GPG12 GPG11    GPG10    GPG9     GPG8     GPG7      GPG6    
    //Signal : nYPON  YMON nXPON XMON  EINT19 DMAMODE1 DMAMODE0 DMASTART KBDSPICLK KBDSPIMOSI
    //Setting: nYPON  YMON nXPON XMON  EINT19  Output   Output   Output   SPICLK1    SPIMOSI1
    //Binary :   11    11 , 11    11  , 10      01    ,   01       01   ,    11         11
    //-----------------------------------------------------------------------------------------
    //Ports  :    GPG5       GPG4    GPG3    GPG2    GPG1    GPG0    
    //Signal : KBDSPIMISO LCD_PWREN EINT11 nSS_SPI IRQ_LAN IRQ_PCMCIA
    //Setting:  SPIMISO1  LCD_PWRDN EINT11   nSS0   EINT9    EINT8
    //Binary :     11         11   ,  10      11  ,  10        10
    *(unsigned int *)rGPGCON = 0xff95ffba;
    *(unsigned int *)rGPGUP  = 0xffff;    // The pull up function is disabled GPG[15:0]
#else     
	//config GPG15-12 to Touch Panel signals
	//config GPG11-10 to output pins
	//config GPG9-8   to output pins
	//config GPG7-5   to output pins ----Testpoints:TP6,4,2
	//config GPG4     to LCD Power Enable
	//config GPG3-2   to output pins ----Testpints:TP8,7
	//config GPG1-0   to output pins ----GPRS_boot and GPRS_PWR 
	*(unsigned int *)rGPGCON = 0xff055555;
	*(unsigned int *)rGPGUP  = 0xfffff;
#endif

/*    
    //GPG4 Output Port [9:8] 01      -> LCD_PWREN Enable
    rGPGCON = (rGPGCON & 0xfffffcff) | (1<<8);
    rGPGDAT = (rGPGDAT & 0xffef) | (1<<4);
*/
    //=== PORT H GROUP
    //Ports  :  GPH10    GPH9  GPH8 GPH7  GPH6  GPH5 GPH4 GPH3 GPH2 GPH1  GPH0 
    //Signal : CLKOUT1 CLKOUT0 UCLK nCTS1 nRTS1 RXD1 TXD1 RXD0 TXD0 nRTS0 nCTS0
    //Binary :   10   ,  10     10 , 11    11  , 10   10 , 10   10 , 10    10
    *(unsigned int *)rGPHCON = 0x2afaaa;
    *(unsigned int *)rGPHUP  = 0x7ff;    // The pull up function is disabled GPH[10:0]
    
    //External interrupt will be falling edge triggered. 
    *(unsigned int *)rEXTINT0 = 0x22222222;    // EINT[7:0]
    *(unsigned int *)rEXTINT1 = 0x22222222;    // EINT[15:8]
    *(unsigned int *)rEXTINT2 = 0x22222222;    // EINT[23:16]
}

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Function:		SPI_Init()

Description:	Initializes the Serial Peripheral Interface (SPI)

Notes:			This routine assumes that the control registers (see 
				the globals section above) have already been initialized.

Returns:		Boolean indicating success.
-------------------------------------------------------------------*/
BOOL SPI_Init(VOID)
{
	int index;

//	index = *(unsigned int *)rCLKCON;
//	*(unsigned int *)rCLKCON = index;
//	index = 0;
//	index = *(unsigned int *)rCLKCON;
//	printk("rCLKCON = %d\n",index);

	
	*(unsigned int *)rGPGDAT = (*(unsigned int *)rGPGDAT)|CHIP_DESELECT_nSS0;
	//chip select SPI1 ???
	
	//----- 1. IMPORTANT: By default, the internal clock is disabled.  To configure the controller ------
	//					  we must first enable it.
	StartSPIClock();
    
	SetSPIClockRate(CLK_RATE_SLOW);

	//----- 2. Configure the GPIO pins for SPI mode -----
	//
	//		   nSPICS0  (chip select)		= GPG2
	//		   SPICLK0  (SPI clock)			= GPE13
	//		   SPIMOSIO (SPI output data)	= GPE12
/*   
	*(unsigned int *)rGPGCON = (*(unsigned int *)rGPGCON) & CLEAR_GPG2_MASK;
	*(unsigned int *)rGPGCON = (*(unsigned int *)rGPGCON) | ENABLE_GPG2_OUTPUT;
	*(unsigned int *)rGPGUP  = (*(unsigned int *)rGPGUP)  & ENABLE_GPG2_PULLUP;
//	port_outl(rGPGUP , (port_inl(rGPGUP) & 0x0));
	*(unsigned int *)rGPGCON = (*(unsigned int *)rGPECON) & 0xf03fffff;
	*(unsigned int *)rGPECON = (*(unsigned int *)rGPECON) | ENABLE_SPICLK0 | ENABLE_SPIMSIO;
//	*(unsigned int *)rGPEUP  = (*(unsigned int *)rGPEUP） | DISABLE_SPICLK_SPIMSIO_PULLUP;	// Disable pullup-resistor for SPICLK0 and SPIMOSIO   the name is too long 
//	*(unsigned int *)rGPEUP  = (*(unsigned int *)rGPEUP)  | TEST;    //#define TEST 0x00003800 in spi.h
	*(unsigned int *)rGPEUP  = (*(unsigned int *)rGPEUP)  | 0x00003800;
//	port_outl(rGPEUP , (port_inl(rGPEUP)  | 0xffffffff));
*/
	Port_Init();

	//----- 3. Configure the SPI controller with reasonable default values -----
	*(unsigned int *)rSPCON0 = SPI_MODE_POLLING | SPI_SELECT_MASTER | SPI_CLOCK_ENABLE;
	*(unsigned int *)rSPCON1 = SPI_MODE_POLLING | SPI_SELECT_MASTER | SPI_CLOCK_ENABLE;

	for( index = 0; index < 20; index++)
		*(unsigned char *)rSPTDAT0 =  0xFF;

	for( index = 0; index < 20; index++)
		*(unsigned char *)rSPTDAT1 =  0xFF;

    //StopSPIClock();

	return TRUE;
}


/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Function:		SPI_Deinit()

Description:	Deinitializes the Serial Peripheral Interface (SPI)

Notes:			This routine DOES NOT unmap the control registers;
				the caller is responsible for freeing this memory.

Returns:		Boolean indicating success.
-------------------------------------------------------------------*/
BOOL SPI_Deinit(VOID)
{
	//----- 1. Stop the SPI clocks -----
    StopSPIClock();

	return TRUE;
}


/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Function:		SPI_SendByte()

Description:	Sends the specified byte out onto the SPI bus.

Returns:		Boolean indicating success.
-------------------------------------------------------------------*/
BOOL SPI_SendByte(BYTE bData, BYTE* pData)
{
    //----- 0. Start clock
    //StartSPIClock();

	//----- 1. Chip select the slave device (active low) -----
	//rGPGDAT &= CHIP_SELECT_nSS0;

	//----- 2. Wait until the controller is ready to transfer -----
	if(SPI_WaitTxRxReady()==FALSE) return FALSE;
	

//	printk("after the 1st wait in SPI_SendByte.\n");

	//----- 3. Put the byte out onto the SPI bus -----
	*(unsigned char *)rSPTDAT0 =  bData;