📄 s3c44b0-mcp2510.c
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/*
* s3c44b0-mcp2510.c
*
* spi driver for SAMSUNG S3C44B0
*
* Author: threewater <threewater@up-tech.com>
* Date : $Date: 2003/12/20 22:25:00 $
*
* $Revision: 1.1.0.0 $
*
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* History:
*
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <asm/hardware.h>
#include <asm/arch/exio.h>
#include <asm/arch/spi.h>
#include "s3c44b0-spi.h"
#include "s3c44b0-spidev.h"
#include "up-can.h"
/* debug macros */
#undef DEBUG
//#define DEBUG
#ifdef DEBUG
#define DPRINTK( x... ) printk("s3c44b0-mcp2510: " ##x)
#else
#define DPRINTK( x... )
#endif
/********************** MCP2510 Pin *********************************/
#define MCP2510_CS 0x4 //EXIO2
/********************** MCP2510 Instruction *********************************/
#define MCP2510INSTR_RESET 0xc0
#define MCP2510INSTR_READ 0x03
#define MCP2510INSTR_WRITE 0x02
#define MCP2510INSTR_RTS 0x80 //request to send
#define MCP2510INSTR_RDSTAT 0xa0 //read status
#define MCP2510INSTR_BITMDFY 0x05 //bit modify
/********************** MCP2510 Regrister *********************************/
// Register offsets into the transmit buffers.
#define MCP2510REG_TXBnCTRL 0
#define MCP2510REG_TXBnSIDH 1
#define MCP2510REG_TXBnSIDL 2
#define MCP2510REG_TXBnEID8 3
#define MCP2510REG_TXBnEID0 4
#define MCP2510REG_TXBnDLC 5
#define MCP2510REG_TXBnD0 6
#define MCP2510REG_TXBnD1 7
#define MCP2510REG_TXBnD2 8
#define MCP2510REG_TXBnD3 9
#define MCP2510REG_TXBnD4 10
#define MCP2510REG_TXBnD5 11
#define MCP2510REG_TXBnD6 12
#define MCP2510REG_TXBnD7 13
#define MCP2510REG_CANSTAT 14
#define MCP2510REG_CANCTRL 15
//
#define MCP2510LREG_SIDH 0
#define MCP2510LREG_SIDL 1
#define MCP2510LREG_EID8 2
#define MCP2510LREG_EID0 3
/******************* Bits in the TXBnCTRL registers.***************************/
#define TXB_TXBUFE_M 0x80
#define TXB_ABTF_M 0x40
#define TXB_MLOA_M 0x20
#define TXB_TXERR_M 0x10
#define TXB_TXREQ_M 0x08
#define TXB_TXIE_M 0x04
#define TXB_TXP10_M 0x03
#define DLC_MASK 0x0F
#define RTR_MASK 0x40
#define TXB0CTRL 0x30
#define TXB0SIDH 0x31
#define TXB1CTRL 0x40
#define TXB1SIDH 0x41
#define TXB2CTRL 0x50
#define TXB2SIDH 0x51
#define TXPRIOHIGH 0x03
#define TXPRIOHIGHLOW 0x02
#define TXPRIOLOWHIGH 0x01
#define TXPRIOLOW 0x00
#define TXB_EXIDE_M 0x08 // In TXBnSIDL
#define TXB_RTR_M 0x40 // In TXBnDLC
#define RXB_IDE_M 0x08 // In RXBnSIDL
#define RXB_RTR_M 0x40 // In RXBnDLC
#define BFPCTRL 0x0C
#define B2RTS 0x20
#define B1RTS 0x10
#define B0RTS 0x08
#define B2RTSM 0x04
#define B1RTSM 0x02
#define B0RTSM 0x01
#define TEC 0x1C
#define REC 0x1D
#define CLKCTRL MCP2510REG_CANCTRL
#define RXF0SIDH 0
#define RXF0SIDL 1
#define RXF0EID8 2
#define RXF0EID0 3
#define RXF1SIDH 4
#define RXF1SIDL 5
#define RXF1EID8 6
#define RXF1EID0 7
#define RXF2SIDH 8
#define RXF2SIDL 9
#define RXF2EID8 10
#define RXF2EID0 11
#define RXF3SIDH 16
#define RXF3SIDL 17
#define RXF3EID8 18
#define RXF3EID0 19
#define RXF4SIDH 20
#define RXF4SIDL 21
#define RXF4EID8 22
#define RXF4EID0 23
#define RXF5SIDH 24
#define RXF5SIDL 25
#define RXF5EID8 26
#define RXF5EID0 27
#define RXF_EXIDE_M 0x08
#define RXM0SIDH 0x20
#define RXM1SIDH 0x24
#define CNF3 0x28
#define CNF2 0x29
#define CNF1 0x2A
#define CANINTE 0x2B
#define CANINTF 0x2C
#define EFLG 0x2D
#define TXRTSCTRL 0x0D
#define EFLG_RX1OVR 0x80
#define EFLG_RX0OVR 0x40
#define EFLG_TXBO 0x20
#define EFLG_TXEP 0x10
#define EFLG_RXEP 0x08
#define EFLG_TXWAR 0x04
#define EFLG_RXWAR 0x02
#define EFLG_EWARN 0x01
#define SJW1 0x00
#define SJW2 0x40
#define SJW3 0x80
#define SJW4 0xC0
#define BTLMODE_CNF3 0x80
#define SAMP1 0x00
#define SAMP3 0x40
#define SEG1 0x00
#define SEG2 0x01
#define SEG3 0x02
#define SEG4 0x03
#define SEG5 0x04
#define SEG6 0x05
#define SEG7 0x06
#define SEG8 0x07
#define BRP1 0x00
#define BRP2 0x01
#define BRP3 0x02
#define BRP4 0x03
#define BRP5 0x04
#define BRP6 0x05
#define BRP7 0x06
#define BRP8 0x07
#define IVRIE 0x80
#define WAKIE 0x40
#define ERRIE 0x20
#define TX2IE 0x10
#define TX1IE 0x08
#define TX0IE 0x04
#define RX1IE 0x02
#define RX0IE 0x01
#define NO_IE 0x00
#define IVRINT 0x80
#define WAKINT 0x40
#define ERRINT 0x20
#define TX2INT 0x10
#define TX1INT 0x08
#define TX0INT 0x04
#define RX1INT 0x02
#define RX0INT 0x01
#define NO_INT 0x00
#define RXB0CTRL 0x60
#define RXB1CTRL 0x70
#define RXB_RXRDY 0x80
#define RXB_RXM1 0x40
#define RXB_RXM0 0x20
#define RXB_RX_ANY 0x60
#define RXB_RX_EXT 0x40
#define RXB_RX_STD 0x20
#define RXB_RX_STDEXT 0x00
#define RXB_RXMx_M 0x60
// #define RXB_RXIE_M 0x10
#define RXB_RXRTR 0x08 // In RXBnCTRL
#define RXB_BUKT 0x04
#define RXB_BUKT_RO 0x02
#define RXB_FILHIT 0x01
#define RXB_FILHIT2 0x04
#define RXB_FILHIT1 0x02
#define RXB_FILHIT_M 0x07
#define RXB_RXF5 0x05
#define RXB_RXF4 0x04
#define RXB_RXF3 0x03
#define RXB_RXF2 0x02
#define RXB_RXF1 0x01
#define RXB_RXF0 0x00
#define CLKEN 0x04
#define CLK1 0x00
#define CLK2 0x01
#define CLK4 0x02
#define CLK8 0x03
#define MODE_NORMAL 0x00
#define MODE_SLEEP 0x20
#define MODE_LOOPBACK 0x40
#define MODE_LISTENONLY 0x60
#define MODE_CONFIG 0xE0
#define ABORT 0x10
////////////////////////////////////////////////////////////////////////////
#define MCP2510_OPEN_INT() do{PCONG |= (3<<12);}while(0) //into EXINT mode
#define MCP2510_CLOSE_INT() do{PCONG &= ~(3<<12);}while(0)//into input mode
#define IRQ_MCP2510 INT_EINT6
#define MCP2510_Enable() do{CLREXIOBIT(MCP2510_CS);udelay(10);}while(0)
#define MCP2510_Disable() do{SETEXIOBIT(MCP2510_CS);udelay(10);}while(0)
// Start the transmission from one of the tx buffers.
#define MCP2510_transmit(address) do{MCP2510_WriteBits(address, TXB_TXREQ_M, TXB_TXREQ_M);}while(0)
#define MCP2510_CanRevBuffer 128 //CAN接收缓冲区大小
/********************** MCP2510 Candata *********************************/
typedef struct {
CanData MCP2510_Candata[MCP2510_CanRevBuffer]; //recieve data buffer
int nCanRevpos; //recieve buffer pos for queued events
int nCanReadpos; //read buffer pos for queued events
int loopbackmode;
wait_queue_head_t wq;
spinlock_t lock;
}Mcp2510_DEV;
static Mcp2510_DEV mcp2510dev;
#define NextCanDataPos(pos) do{(pos)=((pos)+1>=MCP2510_CanRevBuffer? 0: (pos)+1);}while(0)
#define DEVICE_NAME "s3c44b0-mcp2510"
#define SPIRAW_MINOR 1
static int tsMajor = 0;
static int opencount=0;
#define TRUE 1
#define FALSE 0
static inline void MCP2510_Reset(void)
{
MCP2510_Enable();
SendSIOData(MCP2510INSTR_RESET);
MCP2510_Disable();
}
static void MCP2510_Write(int address, int value)
{
int flags;
local_irq_save(flags);
MCP2510_Enable();
SendSIOData(MCP2510INSTR_WRITE);
SendSIOData((unsigned char)address);
SendSIOData((unsigned char)value);
MCP2510_Disable();
local_irq_restore(flags);
}
static unsigned char MCP2510_Read(int address)
{
unsigned char result;
int flags;
local_irq_save(flags);
MCP2510_Enable();
SendSIOData(MCP2510INSTR_READ);
SendSIOData((unsigned char)address);
SendSIOData(0);
result=ReadSIOData();
MCP2510_Disable();
local_irq_restore(flags);
return result;
}
static unsigned char MCP2510_ReadStatus(void)
{
unsigned char result;
int flags;
local_irq_save(flags);
MCP2510_Enable();
SendSIOData(MCP2510INSTR_RDSTAT);
SendSIOData(0);
result=ReadSIOData();
MCP2510_Disable();
local_irq_restore(flags);
return result;
}
static void MCP2510_WriteBits( int address, int data, int mask )
{
int flags;
local_irq_save(flags);
MCP2510_Enable();
SendSIOData(MCP2510INSTR_BITMDFY);
SendSIOData((unsigned char)address);
SendSIOData((unsigned char)mask);
SendSIOData((unsigned char)data);
MCP2510_Disable();
local_irq_restore(flags);
}
/*******************************************\
* 序列读取MCP2510数据 *
\*******************************************/
static void MCP2510_SRead( int address, unsigned char* pdata, int nlength )
{
int i;
int flags;
local_irq_save(flags);
MCP2510_Enable();
SendSIOData(MCP2510INSTR_READ);
SendSIOData((unsigned char)address);
for (i=0; i<nlength; i++) {
SendSIOData(0);
*pdata=ReadSIOData();
pdata++;
}
MCP2510_Disable();
local_irq_restore(flags);
}
/*******************************************\
* 序列写入MCP2510数据 *
\*******************************************/
static void MCP2510_Swrite(int address, unsigned char* pdata, int nlength)
{
int i;
int flags;
local_irq_save(flags);
MCP2510_Enable();
SendSIOData(MCP2510INSTR_WRITE);
SendSIOData((unsigned char)address);
for (i=0; i < nlength; i++) {
SendSIOData((unsigned char)*pdata);
pdata++;
}
MCP2510_Disable();
local_irq_restore(flags);
}
/************************************************************\
* 设置MCP2510 CAN总线波特率 *
* 参数: bandrate为所设置的波特率 *
* IsBackNormal为是否要返回Normal模式 *
\************************************************************/
static void MCP2510_SetBandRate(CanBandRate bandrate, int IsBackNormal)
{
//
// Bit rate calculations.
//
//Input clock fre=16MHz
// In this case, we'll use a speed of 125 kbit/s, 250 kbit/s, 500 kbit/s.
// If we set the length of the propagation segment to 7 bit time quanta,
// and we set both the phase segments to 4 quanta each,
// one bit will be 1+7+4+4 = 16 quanta in length.
//
// setting the prescaler (BRP) to 0 => 500 kbit/s.
// setting the prescaler (BRP) to 1 => 250 kbit/s.
// setting the prescaler (BRP) to 3 => 125 kbit/s.
//
// If we set the length of the propagation segment to 3 bit time quanta,
// and we set both the phase segments to 1 quanta each,
// one bit will be 1+3+2+2 = 8 quanta in length.
// setting the prescaler (BRP) to 0 => 1 Mbit/s.
// Go into configuration mode
MCP2510_Write(MCP2510REG_CANCTRL, MODE_CONFIG);
switch(bandrate){
case BandRate_125kbps:
MCP2510_Write(CNF1, SJW1|BRP4); //Synchronization Jump Width Length =1 TQ
MCP2510_Write(CNF2, BTLMODE_CNF3|(SEG4<<3)|SEG7); // Phase Seg 1 = 4, Prop Seg = 7
MCP2510_Write(CNF3, SEG4);// Phase Seg 2 = 4
break;
case BandRate_250kbps:
MCP2510_Write(CNF1, SJW1|BRP2); //Synchronization Jump Width Length =1 TQ
MCP2510_Write(CNF2, BTLMODE_CNF3|(SEG4<<3)|SEG7); // Phase Seg 1 = 4, Prop Seg = 7
MCP2510_Write(CNF3, SEG4);// Phase Seg 2 = 4
break;
case BandRate_500kbps:
MCP2510_Write(CNF1, SJW1|BRP1); //Synchronization Jump Width Length =1 TQ
MCP2510_Write(CNF2, BTLMODE_CNF3|(SEG4<<3)|SEG7); // Phase Seg 1 = 4, Prop Seg = 7
MCP2510_Write(CNF3, SEG4);// Phase Seg 2 = 4
break;
case BandRate_1Mbps:
MCP2510_Write(CNF1, SJW1|BRP1); //Synchronization Jump Width Length =1 TQ
MCP2510_Write(CNF2, BTLMODE_CNF3|(SEG3<<3)|SEG2); // Phase Seg 1 = 2, Prop Seg = 3
MCP2510_Write(CNF3, SEG2);// Phase Seg 2 = 1
break;
}
if(IsBackNormal){
//Enable clock output
MCP2510_Write(CLKCTRL, MODE_NORMAL | CLKEN | CLK1);
}
}
/*******************************************\
* 读取MCP2510 CAN总线ID *
* 参数: address为MCP2510寄存器地址*
* can_id为返回的ID值 *
* 返回值 *
* TRUE，表示是扩展ID(29位) *
* FALSE，表示非扩展ID(11位) *
\*******************************************/
static int MCP2510_Read_Can_ID( int address, __u32* can_id)
{
__u32 tbufdata;
unsigned char* p=(unsigned char*)&tbufdata;
MCP2510_SRead(address, p, 4);
*can_id = (tbufdata<<3)|((tbufdata>>13)&0x7);
*can_id &= 0x7ff;
if ( (p[MCP2510LREG_SIDL] & TXB_EXIDE_M) == TXB_EXIDE_M ) {
*can_id = (*can_id<<2) | (p[MCP2510LREG_SIDL] & 0x03);
*can_id <<= 16;
*can_id |= tbufdata>>16;
return TRUE;
}
return FALSE;
}
/***********************************************************\
* 读取MCP2510 接收的数据 *
* 参数: *
* nbuffer为第几个缓冲区可以为3或者4 *
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