spi.c
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上传日期:2022-08-02
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文件大小:16k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- 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 = %dn",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;
- //----- 4. Delay a little bit so the byte finishes clocking out before the chip select line is deasserted -----
- if(SPI_WaitTxRxReady()==FALSE) return FALSE;
- // printk("after the 2nd wait in SPI_SendByte.n");
- *pData = *(unsigned char *)rSPRDAT0;
- //----- 5. Deselect the slave device (active low) -----
- //rGPGDAT |= CHIP_DESELECT_nSS0;
- // StopSPIClock();
- return TRUE;
- }
- BOOL SPI_ReadByte(BYTE *pData)
- {
- BOOL bRet = TRUE;
- //----- 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;
- //----- 3. Put the byte out onto the SPI bus -----
- *pData = *(unsigned char *)rSPRDAT0;
- //----- 4. Delay a little bit so the byte finishes clocking out before the chip select line is deasserted -----
- //if(SPI_WaitTxRxReady()==FALSE) return FALSE;
- //----- 5. Deselect the slave device (active low) -----
- //rGPGDAT |= CHIP_DESELECT_nSS0;
- // StopSPIClock();
- return bRet;
- }
- BOOL SPI_WaitTxRxReady(VOID)
- {
- int waitCount;
- // int reg;
- //----- 1. Wait until the controller is ready to transfer -----
- waitCount = 1000;
- while(!((*(unsigned int *)rSPSTA0) & SPI_TRANSFER_READY))
- {
- if(--waitCount == 0)
- {
- // reg = *(unsigned int *)rSPSTA0;
- // printk("rSPSTA0 = %dn",reg);
- // printk("WaitTxRxReady return FALSE.n");
- // ssleep(1);
- // msleep(1);
- mdelay(10);
- // udelay(1);
- // ndelay(1);
- return FALSE;
- }
- }
- return TRUE;
- }
- /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- Function: SPI_SendWord()
- Description: Sends the specified word out onto the SPI bus.
- Returns: Boolean indicating success.
- -------------------------------------------------------------------*/
- /*BOOL SPI_SendWord(WORD wData)
- {
- BOOL bRet = TRUE;
- DWORD waitCount = 0;
- StartSPIClock();
- //----- 1. Chip select the slave device (active low) -----
- rGPGDAT &= CHIP_SELECT_nSS0;
- //----- 2. Wait until the controller is ready to transfer -----
- waitCount = 1000;
- while(!(rSPSTA0 & SPI_TRANSFER_READY))
- {
- if(--waitCount == 0)
- {
- bRet = FALSE;
- goto SEND_ERROR;
- }
- }
- //----- 3. Send first half of word -----
- rSPTDAT0 = (wData & 0xFF00) >> 8;
- //----- 4. Wait until the controller is ready to transfer -----
- waitCount = 1000;
- while(!(rSPSTA0 & SPI_TRANSFER_READY))
- {
- if(--waitCount == 0)
- {
- //RETAILMSG(1, (TEXT("WAVEDEV.DLL: SPI_SendWord() - timeout occurred while waiting to transfer bytern")));
- bRet = FALSE;
- goto SEND_ERROR;
- }
- }
- //----- 5. Send second half of word -----
- rSPTDAT0 = (wData & 0x00FF);
- //----- 6. Delay a little bit so the byte finishes clocking out before the chip select line is deasserted -----
- WAIT(10000);
- //----- 7. Deselect the slave device (active low) -----
- rGPGDAT |= CHIP_DESELECT_nSS0;
- SEND_ERROR:
- StopSPIClock();
- return bRet;
- }
- */
- //------------------------------------ Helper Routines ------------------------------------
- /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- Function: StartSPIClock()
- Description: Enables the SPI clock.
- Returns: N/A
- -------------------------------------------------------------------*/
- VOID StartSPIClock(VOID)
- {
- *(unsigned int *)rCLKCON = (*(unsigned int *)rCLKCON)|SPI_INTERNAL_CLOCK_ENABLE;// Enable the CPU clock to the SPI controller
- *(unsigned int *)rSPCON0 = (*(unsigned int *)rSPCON0)|SPI_CLOCK_ENABLE|SPI_SELECT_MASTER;// Enable the SPI clock
- return;
- }
- /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- Function: StopSPIClock()
- Description: Disables the SPI clock.
- Returns: N/A
- -------------------------------------------------------------------*/
- VOID StopSPIClock(VOID)
- {
- *(unsigned int *)rCLKCON = (*(unsigned int *)rCLKCON) & ~SPI_INTERNAL_CLOCK_ENABLE; // Disable the CPU clock to the SPI controller
- *(unsigned int *)rSPCON0 = (*(unsigned int *)rCLKCON) & ~SPI_CLOCK_ENABLE; // Disable the SPI clock
- return;
- }
- /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- Function: SetSPIClockRate()
- Description: Sets the SPI clock (a.k.a. baud) rate:
- Params: ClockRate 0x00 = 25Mhz
- 0x01 = 1/2 25Mhz
- 0x02 = 1/4 25Mhz
- 0x03 = 1/8 25Mhz
- 0x04 = 1/16 25Mhz
- 0x05 = 1/32 25Mhz
- 0x06 = 1/64 25Mhz
- 0x07 = 99.121Khz
- Returns: N/A
- -------------------------------------------------------------------*/
- VOID SetSPIClockRate(DWORD ClockRate)
- {
- UINT16 prescale;
- //----- 1. Set the clock rate -----
- // NOTE: Using the prescale value, the clock's baud rate is
- // determined as follows: baud_rate = (PCLK / 2 / (prescale + 1))
- //
- // Hence, the prescale value can be computed as follows:
- // prescale = ((PCLK / 2) / baud_rate) - 1
- switch(ClockRate)
- {
- case CLK_RATE_FULL: // 25 Mhz
- prescale = (PCLK / 40000000) - 1;
- break;
- case CLK_RATE_HALF: // 1/2 25 Mhz
- prescale = (PCLK / 30000000) - 1;
- break;
- case CLK_RATE_FOUR: // 1/4 25 Mhz
- prescale = (PCLK / 10000000) - 1;
- break;
- case CLK_RATE_EIGHT: // 1/8 25 Mhz
- prescale = (PCLK / 500000) - 1;
- break;
- case CLK_RATE_SIXTEEN: // 1/16 25 Mhz
- prescale = (PCLK / 2500000) - 1;
- break;
- case CLK_RATE_THIRTY2: // 1/32 25 Mhz
- prescale = (PCLK / 1250000) - 1;
- break;
- case CLK_RATE_SIXTY4: // 1/64 25 Mhz
- prescale = (PCLK / 625000) - 1;
- break;
- case CLK_RATE_SLOW: // 99.121 kHz (i.e. ~1/256 25Mhz)
- prescale = 255;
- break;
- default:
- return;
- break;
- }
- *(unsigned int *)rSPPRE0 = prescale;
- return;
- }