在860里增加TL16C554多串口芯片驱动

1、在860里增加 TL16C554多串口芯片驱动（一）串口通讯控制器）和2个SMCSerial6个串口。但笔者开发的通讯控制器 smCT展显然不能满足要求，需要需MPC860t 有 4 个 SCC（serial communications controller management controller串口管理控制器）,一共可以扩展 项目中，由于考虑到需要扩展8个或更多串口， SCC和求一种新的可扩展的串口芯片。我们采用两个TL16C554芯片来解决这个问题。一个 TL16C554芯片集成了四个 ST16550 ACE （异步通讯元件 ASYNCHRONOUS COMMUNICATIONS E

2、LEMENT ）。二.串口驱动简介注意：此处.ttyDrvxxDrv，yyDrv表示一个特定的驱动程序，下同 虚拟驱动，用以.管理 I/O System.调用实际的驱动程序来管理硬件.Model.xxDrv 支持：标准 I/O System 接口Target Agent 接口 两种模式(中断interrupt,轮巡poll).回调 CallBacks允许高层协议来设定驱动怎样收发数据有两个回调(驱动调用)Put回调：传送一个从设备读到的字符到高层协议 get回调：从高层协议取得一个字符以便写到设备 代码实现一般性代码特定执行代码设备特定代码usrC on fig.c sysSerial.c x

3、xDrv.c(调用和实现部分)usrConfig.C'SysSerial.c注意：由于我们采用了多种设备实际的驱动(SMC和16C554),所以在sysSerial.c里需要整合，整合的函数包括sysSerialHwI ni t(),)，这里调用了 里定义，它把.(注意，如里与串口有关的部分(前面部分是早期版本的，不予理会ttyDevCreate ()，sysSerialChanGet()在 sysSerials.cSIO_CHAN类型的结构关联起来，而这个结构在是至关重要的)sysSerialHwI nit2 (),sysSerialCha nGet(),sysSerialReset

4、() 解读 usrConfig.c 先看 usrConfig.c ttyDrv(),然后用 设备的编号同一个 果系统采用串口调试，则该串口号被保留起来ttyDev()作的工作：调用iosDrvInstall 安装ttyDrv 到设备表(使用 ttyDrv 和tyLib 的入口) ttyDevCreate ()作的工作：申请并初始化设备描述调用 tyDevinit() 初始化 tyLib初始化selectLib 建立输入输出环行缓冲创建信号量调用iosDevAdd()增加设备到设备列表安装tyLib的程序和输入输出回调 使设备开始中断模式#ifdef INCLUDE_TYCODRV_5_2 #i

5、fdef INCLUDE_TTY_DEVif (NUM_TTY > 0) tyCoDrv ();/* in stall con sole driver */for (ix = 0; ix < NUM_TTY; ix+) /* create serial devices */ sprintf (tyName, "%s%d", "/tyCo/", ix);(void) tyCoDevCreate (tyName, ix, 512, 512);if (ix = CONSOLE_TTY)strc py (con soleName, tyName);

6、/* store con sole n ame */con soleFd = open (co nsoleName, O_RDWR, 0);/* set baud rate */(void) ioctl (co nsoleFd, FIOBAUDRA TE, CONSOLE_BAUD_RATE);(void) ioctl (co nsoleFd, FIOSET OP TIONS, OP T_TERMINAL);#endif/* INCLUDE_TTY_DEV */#else/* !INCLUDE TYCODRV 5 2 */#ifdefINCLUDE_TTY_DEVif (NUM_TTY >

7、; 0) ttyDrv();/* i nstall con sole driver */for (ix = 0; ix < NUM_TTY; ix+) /* create serial devices */#if (defi ned(INCLUDE_WDB) && (WDB_COMM_T YPE = WDB_COMM_SERIAL) if (ix = WDB_TTY_CHANNEL)/* don't use WDBs cha nnel */con ti nue;#en difsprintf (tyName, "%s%d", "/tyC

8、o/", ix);(void) ttyDevCreate (tyName, sysSerialCha nGet(ix), 512, 512);if (ix = CONSOLE_TTY)/* i nit the tty con sole */strc py (con soleName, tyName);con soleFd = open (con soleName, O_RDWR, 0);(void) ioctl (co nsoleFd, FIOBAUDRA TE, CONSOLE_BAUD_RATE);(void) ioctl (co nsoleFd, FIOSET OP TIONS

9、, OP T_TERMINAL);#endif/* INCLUDE_TTY_DEV */* !INCLUDE TYCODRV 5 2*/#endifsysSerialChanGet():以下是单独采用 860 smc时的情况SIO_CHAN * sysSerialCha nGet ( int cha nnel/* serial cha nnel */)if (cha nnel >= cha nNum)return (SIO_CHAN *) ERROR);return (SIO_CHAN *) &pp c860Cha n chann el); 单独采用16c554时为：SIO_CH

10、AN * sysSerialCha nGet(int cha nnel)if (channel < 0 |channel >= (int) (NELEMENTS(sysSioCha ns) return (SIO_CHAN *) ERROR;/* serial cha nnel */return sysSioCha nscha nn el;我们必须把两种情况整合.SIO_CHAN * sysSerialCha nGet (int cha nnelif (channel < 0 |channel >= (int) (NELEMENTS(sysSioCha ns) retu

11、rn (SIO_CHAN *) ERROR;if cha nn el<=1return (SIO_CHAN *)pp c860Cha n cha nnel elseretur n sysSioCha nscha nn el-2;sysSerialResetO关于sysSerialResset，由于16c554和860的smc采用不同的原理，所以其重启也有不同, 所以在sysSerialResetO里要考虑两中情况void sysSerialReset (void)/* disable serial in terr upts */ in tDisable (devParasO.i ntLe

12、vel);void sysSerialReset (void)sysSerialHwI ni t (); void sysSerialReset (void)sysSerialHwI ni t ();in tDisable (devParas0.i ntLevel);重中之重：关于 sysSerialHwlnit2 ()sysSerialHwInit2()由 usrConfig.c 里的 usrRoot 调用，用于连接中断 smc的如下：void sysSerialHwI nit2 (void)i; /* an in dex */int/* connect serial in terr upt

13、s */for (i = 0; i < cha nNum; i+) switch (i)case 0:(void) in tCo nn ect (IV_SMC1, (VOIDFUNC PTR) pp c860I nt,(int) &PP c860Cha n i);break;case 1:(void) in tCo nn ect (IV_SMC2_ PIP, (VOIDFUNC PTR) pp c860I nt,(int) &PP c860Cha n i);break;default: return;*CIMR(vxlmmrGet() |= (CIMR_SMC1 >

14、> i);CIMR是一个叫CP Int mask reg的宏，这里分别开启 SMC1和SMC2的中断 #defi ne CIMR_SMC10x00000010 /* SMC 1 */#defi ne CIMR_SMC2_ PIP0x00000008 /* SMC 2 */ #defi ne CIMR(base) (CAST(VUINT32 *)(base) + 0x0948)为什么在不在 sysSerialHwinit()里调用连接呢？因为在sysHwInit()执行的时刻内核内存分配算符还没有初始化！16C554 的：void sysSerialHwI nit2 (void)(void

15、) in tCo nn ect (INUM_TO_IVEC(dev Paras0.vector),st16554MuxI nt, (int) & st16554Mux);intEn able (devParas0.i ntLevel);各位必须注意，16c554中断服务程序是一个多重的，意思是：所有使用同一中断的8个通道有一样的中断服务程序，这样在st16554MuxInt ()处理的时候需要做出相应的判断(具体实现见后面)经过整合后的sysSerialHwInit2应该是： void sysSerialHwI nit2 (void)i; /* an in dex */int/* co

16、nnect serial in terr upts */for (i = 0; i < cha nNum; i+) switch (i)case 0:(void) in tCo nn ect (IV_SMC1, (VOIDFUNC PTR) pp c860l nt,(int) &PP c860Cha n i);break;case 1:(void) in tCo nn ect (IV_SMC2_ PIP, (VOIDFUNC PTR) pp c860I nt,(int) &PP c860Cha n i);break;default: return;*CIMR(vxImmr

17、Get() |= (CIMR_SMC1 >> i); void sysSerialHwI nit2 (void)i; /* an in dex */int/* connect serial in terr upts */for (i = 0; i < 2; i+) switch (i)case 0:(void) in tCo nn ect (IV_SMC1, (VOIDFUNC PTR) pp c860I nt,(int) &PP c860Cha n i);break;case 1:(void) in tCo nn ect (IV_SMC2_ PIP, (VOIDFU

18、NC PTR) pp c860I nt,(int) &PP c860Cha n i);break;default: return;*CIMR(vxlmmrGet() |= (CIMR_SMC1 >> i);(void) in tCo nn ect (INUM_TO_IVEC(dev Paras0.vector), st16554MuxI nt, (int) & st16554Mux);intEn able (devParas0.i ntLevel);重中之重：关于 sysSerialHwInit ()首先看16554的：void sysSerialHw In it

19、(void) int i;for (i = 0; i < N_ST16554_UART_CHANNELS; i+)st16554Cha ni.regDelta = devParasi.regS pace;st16554Cha ni.regs = dev Parasi.baseAdrs;st16554Cha ni.baudRate = CONSOLE_BAUD_RATE;st16554Cha ni.xtal = UART_XTAL_FREQ;st16554Cha ni.level = dev Parasi.i ntLevel;/* In itialise driver functions,

20、 getTxChar, pu tRcvChar and* cha nn elMode and init UART.*/st16554DevI nit (&st16554Cha ni);devParas结构用存放设备的一些参数typ edef structUINT vector;UINT8 *baseAdrs;UINT regS pace;UINT in tLevel; CMA_ST16554_CHAN _P ARAS;LOCAL CMA_ST16554_CHAN _P ARAS dev Paras= INT_VEC_COM, UART_REG_ADDR_INTERV AL,INT_LV

21、L_COM,INT_VEC_COM,UART_REG_ADDR_INTERV AL,(UINT8(UINT8*)SERIAL_A_BASE_ADR,*)SERIAL_B_BASE_ADR,INT_LVL_COM, INT_VEC_COM,UART_REG_ADDR_INTERV INT_LVL_COM, INT_VEC_COM,UART_REG_ADDR_INTERV INT_LVL_COM, INT_VEC_COM,UART_REG_ADDR_INTERV INT_LVL_COM, INT_VEC_COM,UART_REG_ADDR_INTERV INT_LVL_COM, INT_VEC_C

22、OM,UART_REG_ADDR_INTERV INT_LVL_COM, INT_VEC_COM,UART_REG_ADDR_INTERV INT_LVL_COM；从 SERIAL_A_BASE_ADR 至U SERIAL_H_BASE_ADR 表示两个 16c554 的 8 个通道的 基地址。INT_VEC_COM 和INT_LVL_COM 是通道所用中断的矢量和中断号，各位可以看 到8个通道(4 X 2)所用的通道一样.当然可以在设计电路的时候选择不同的通道，但这对有 限的中断是浪费.UART_REG_ADDR_INTERV AL是寄存器的步长，或者叫间隔，等于8.SysSerialHwl

23、nit先对st16554Chan结构做一些初始化 (st16554Chan(i)对应相应的通道)， 设置寄存器步长regDelta,基地址regs,波特率baudRate,时钟晶振频率xtal，中断号intLevel然后调用xxDrv里的st16554DevInit,关于xxDevInit在xxDrv.c详解里详细介绍. 使用smc的SysSerialHwInit要复杂许多void sysSerialHw In it (void) int(UINT8*)SERIAL_C_BASE_ADR,AL,AL,AL,AL,AL,AL,i；/* an in dex */* en able serial I

24、/O on the board */(UINT8(UINT8(UINT8(UINT8(UINT8*BCSR1 &= (BCSR1_RS232_EN_L);/* If running an 823 or an 850, use only SMC1 */*)SERIAL_D_BASE_ADR,*)SERIAL_E_BASE_ADR,*)SERIAL_F_BASE_ADR,*)SERIAL_G_BASE_ADR,*)SERIAL_H_BASE_ADR,if (*BCSR3 & BCSR3_DBID_MASK) = BCSR3_823DB_MASK) | (*BCSR3 & B

25、CSR3_DBID_MASK) = BCSR3_850DB_MASK) cha nNum = 1;if (cha nNum = 2)*BCSR1 &= (BCSR1_RS232_2_EN_L);/* in tialize the chips device descri ptors */for (i = 0; i < cha nNum; i+) UINT32 regBase;/* BRGCLK freq (Hz) */=BRGCLK_FREQ;pp c860Cha n i.clockRate/* IMMR reg has base adr */pp c860Cha n i.regB

26、ase=vxImmrGet();regBase = pp c860Cha n i.regBase;/* use BRG1 for channel 1 and BRG2 for cha nnel 2 */pp c860Cha n i.bgrNum=(i + 1);/* SMC wired for rs232 */pp c860Cha n i.uart.smcNum=(i + 1);/* i nit the number of TBDs */pp c860Cha n i.uart.txBdNum0/* in it the number of RBDs */=pp c860SmcParmsi.smc

27、TbdNum;pp c860Cha n i.uart.rxBdNum=pp c860SmcParmsi.smcRbdNum;/* tran smit BD base adrs */pp c860Cha n i.uart.txBdBase=(SMC_BUF *)(MP C860_REGB_OFFSET +pp c860Smc Parmsi.smcTbdOff);/* receive BD base adrs */pp c860Cha n i.uart.rxBdBase = (SMC_BUF *)(MP C860_REGB_OFFSET +pp c860Smc Parmsi.smcRbdOff);

28、/* tx buf base */ pp c860Cha n i.uart.txBufBase = (u_char *)(MP C860_D PRAM_BASE (regBase)+ pp c860Smc Parmsi.smcTxBufOff)；/* rx buf base */ pp c860Cha n i.uart.rxBufBase = (u_char *)(MP C860_D PRAM_BASE (regBase)+ pp c860Smc Parmsi.smcRxBufOff);/* tran smit buffer size */ pp c860Cha n i.uart.txBufS

29、ize = pp c860SmcParmsi.smcTxBufS z;/* DP RAM addr of SMC1 p arams */ pp c860Cha n i.uart .pSmc = (SMC *) (UINT32) PP C860_D PR_SMC1(MP C860_D PRAM_BASE (regBase)+ (i * 0x100);/* SMCMR1 for SMC1 */ pp c860Cha n i.uart .p SmcReg = (SMC_REG *)(UINT32) MP C860_SMCMR1 (regBase)+ (i * 0x10);/* Mask in ter

30、ru pts */ pp c860Cha n i.uart .p SmcReg->smcm = 0;pp c860Cha n i. pBaud = (UINT32 *) (UINT32) MP C860_BRGC1 (regBase)+ (i * 4);pp c860Cha n i.cha nn elMode = 0;/* select RS232 pins */ *MP C860_ PBP AR(regBase) |= 0xC0 << (i * 4);/* set it to no rmal op eratio ns */*MP C860_SDCR(regBase) = S

31、DCR_RAID_BR5;/* reset the chi p */pp c860DevI nit(&(pp c860Cha n i);经过整合，应该是这样：void sysSerialHw In it (void)inti；/* an in dex */* en able serial I/O on the board */*BCSR1 &= (BCSR1_RS232_EN_L);/* If running an 823 or an 850, use only SMC1 */if (*BCSR3 & BCSR3_DBID_MASK) = BCSR3_823DB_MAS

32、K) | (*BCSR3 & BCSR3_DBID_MASK) = BCSR3_850DB_MASK) cha nNum = 1;if (cha nNum = 2)*BCSR1 &= (BCSR1_RS232_2_EN_L);/* in tialize the chips device descri ptors */for (i = 0; i < 2; i+) UINT32 regBase;/* BRGCLK freq (Hz) */pp c860Cha n i.clockRate=BRGCLK_FREQ;/* IMMR reg has base adr */pp c86

33、0Cha n i.regBase=vxImmrGet();regBase = pp c860Cha n i.regBase;/* use BRG1 for channel 1 and BRG2 for cha nnel 2 */pp c860Cha n i.bgrNum=(i + 1)；/* SMC wired for rs232 */pp c860Cha n i.uart.smcNum=(i + 1)；/* i nit the number of TBDs */pp c860Cha n i.uart.txBdNum0/* in it the number of RBDs */=pp c860

34、SmcParmsi.smcTbdNum;pp c860Cha n i.uart.rxBdNum=pp c860SmcParmsi.smcRbdNum;/* tran smit BD base adrs */pp c860Cha n i.uart.txBdBase=(SMC_BUF *)(MP C860_REGB_OFFSET +pp c860Smc Parmsi.smcTbdOff);/* receive BD base adrs */pp c860Cha n i.uart.rxBdBase = (SMC_BUF *)(MP C860_REGB_OFFSET +pp c860Smc Parms

35、i.smcRbdOff);/* tx buf base */pp c860Cha n i.uart.txBufBase = (u_char *)(MP C860_D PRAM_BASE (regBase)+ pp c860Smc Parmsi.smcTxBufOff)；/* rx buf base */pp c860Cha n i.uart.rxBufBase = (u_char *)(MP C860_D PRAM_BASE (regBase)+ pp c860Smc Parmsi.smcRxBufOff);/* tran smit buffer size */pp c860Cha n i.u

36、art.txBufSize = pp c860SmcParmsi.smcTxBufS z;/* DP RAM addr of SMC1 p arams */pp c860Cha n i.uart .pSmc = (SMC *) (UINT32) PP C860_D PR_SMC1(MP C860_D PRAM_BASE (regBase)+ (i * 0x100);/* SMCMR1 for SMC1 */ pp c860Cha n i.uart .p SmcReg = (SMC_REG *)(UINT32) MP C860_SMCMR1 (regBase)+ (i * 0x10);/* Ma

37、sk in terru pts */ pp c860Cha n i.uart .p SmcReg->smcm = 0;pp c860Cha n i. pBaud = (UINT32 *) (UINT32) MP C860_BRGC1 (regBase)+ (i * 4);pp c860Cha n i.cha nn elMode = 0;/* select RS232 pins */ *MP C860_ PBP AR(regBase) |= 0xC0 << (i * 4);/* set it to no rmal op eratio ns */ *MP C860_SDCR(re

38、gBase) = SDCR_RAID_BR5;/* reset the chip */ pp c860DevI nit(&(pp c860Cha n i);for (i = 0; i < N_ST16554_UART_CHANNELS; i+)st16554Cha ni.regDelta = devParasi.regS pace;st16554Cha ni.regs = devParasi.baseAdrs;st16554Chani.baudRate = CONSOLE_BAUD_RA TE;st16554Cha ni.xtal = UART_XTAL_FREQ;st16554

39、Cha ni.level = dev Parasi.i ntLevel;详细解说：xxDrv for 16c554st16c554.cst16c554.hst15c554.h里除定义一些16c554寄存器的地址偏移量，和一些常数以外，最重要的 就是两个结构.st16554_chan 和 st16554_mux st16554_chan对应于16554串口设备的一个通道/* ST16554_CHAN */typ edef struct st16554_chan/* must be first */sio_chansio;/* sta ndard SIO_CHAN eleme nt */* cal

40、lbacks */STATUS(*getTxChar)();/* in stalled Tx callback routi ne */STATUS(*p utRcvChar)();/* i nstalled Rx callback rout ine */void *getTxArg;/* argume nt to Tx callback routi ne */void *p utRcvArg;/* argume nt to Rx callback rout ine */*/UINT8 *regs;/* ST16554 registers */UINT8level;/* In terr upt

41、level for this device */UINT8ier;/* copy of IER */UINT8lcr;/* copy of LCR */UINT32cha nn elMode;/* such as int, POLL modes */UINT32regDelta;/* register address spacing */intbaudRate;/* the curre nt baud rate */UINT32xtal;/* UART clock freque ncy */ ST16554_CHAN;/* structure used as p arameter to mul

42、t ipl exed in terr upt han dier */typ edef struct st16554_mux int/* ST16554_MUX */* next cha nnel to exam ine on int */n extCha n;ST16554_CHAN *p Cha n; ST16554_MUX;st116554_cha n第一项：标准SIO_CHAN吉构，用于xxDrv与ttyDrv 的通讯接下来是：两个回调函数及参数，用于：当回调需要发生时，把回调函数和参数存放在这里/* array of ST16554_CHAN structs */regs:通道寄存器地

43、址 level:中断级别（号） ier:ier寄存器的软件拷贝icr:icr寄存器的软件拷贝channelmode:通道工作方式（中断模式，轮巡模式） regDelta:寄存器步长baudrate:波特率 xtal:时钟频率st16554_mux:这个结构极其简单，用来存放多重中断服务程序的参数 nextchan:下个需要检查的通道pCha n:指向当前通道的描述结构所有的xxDrv都有类似的框架结构xxCallbaackI nstallxxDevI nitxxTxStart upxxI ntTxxxIn tRcvxxIoCtlxxModeSetxxP olll np utxxP ollOut putxxI ntxxIn tMux驱动回调安装程序int xxCallback In stall( pSsioCha n, callbackT yp e,callback,callbbackArg)pSioChan 指向 SIO_CHAN的指针callbackType SIO CALLBACK GET TX CHAR 或 SIO CALLBACK PUT RCV CHARcallback指向回调