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1.1 ! root 1: /* (-lgl ! 2: * COHERENT Device Driver Kit version 1.2.0 ! 3: * Copyright (c) 1982, 1991 by Mark Williams Company. ! 4: * All rights reserved. May not be copied without permission. ! 5: * ! 6: * $Log: al.c,v $ ! 7: * Revision 1.8 93/04/14 10:09:40 root ! 8: * r75 ! 9: * ! 10: * Revision 1.7 92/07/27 18:16:05 hal ! 11: * Kernel #59 ! 12: * ! 13: * Revision 1.6 92/04/30 08:59:22 hal ! 14: * Add asy. Remove silos from tty struct. ! 15: * ! 16: * Revision 1.5 92/04/13 10:13:01 hal ! 17: * Add AL_ADDR table. ! 18: * Change chip sensing for weird 16550 chips lacking SCR register. ! 19: * ! 20: * Revision 1.4 92/02/20 17:50:52 hal ! 21: * Do 286->S5 sgtty conversion. ! 22: * ! 23: * Revision 1.11 92/01/13 08:37:52 hal ! 24: * alclose() - decrement open count in alx.c ! 25: * ! 26: * Revision 1.10 91/12/20 14:09:50 hal ! 27: * Don't use loopback during chip sense. ! 28: * ! 29: * Revision 1.9 91/12/10 08:01:11 hal ! 30: * Set ALCNT automatically. ! 31: * Set interrupt vector before calling uart_sense(). ! 32: * ! 33: * Revision 1.8 91/12/05 09:35:25 hal ! 34: * Working 16550A code. Nfg on GeeSee. ! 35: * ! 36: * Revision 1.7 91/12/02 19:22:00 hal ! 37: * Last version before FIFO testing. ! 38: * ! 39: -lgl) */ ! 40: /* ! 41: * Driver for an IBM PC asyncronous ! 42: * line, using interrupts. The interface ! 43: * uses a Natty/WD 8250 chip. ! 44: */ ! 45: ! 46: #include <sys/coherent.h> ! 47: #ifndef _I386 ! 48: #include <sys/i8086.h> ! 49: #endif ! 50: #include <sys/con.h> ! 51: #include <errno.h> ! 52: #include <sys/stat.h> ! 53: #include <sys/tty.h> ! 54: #include <sys/clist.h> ! 55: #include <sys/ins8250.h> ! 56: #include <sys/sched.h> ! 57: #include <sys/al.h> ! 58: #include <sys/devices.h> ! 59: ! 60: #define minor_st(dev) (dev & 0x0f) /* up to 16 ports per driver */ ! 61: #define DEV_TTY (alttab[minor_st(dev)]) ! 62: #define ALPORT (((COM_DDP *)(DEV_TTY.t_ddp))->port) ! 63: ! 64: /* ! 65: * This driver can be compiled to drive any possible ! 66: * async port by appropriate definitions of: ! 67: * ALPORT[ab] the io port address(es) ! 68: * ALNUM[ab] com index number (0..3 for com[1..4]) ! 69: * ALINT the interrupt level ! 70: * ALNAME the xxcon name ! 71: * ALMAJ the major device number ! 72: * ALCNT number of ports sharing the interrupt ! 73: * ! 74: * NOTE: if ALCNT is changed, alttab and alintr will need hacking ! 75: * Common code for the different ports is handled by alx.c ! 76: */ ! 77: ! 78: #ifdef ALCOM1 /* COM1_3 definitions */ ! 79: #define ALPORTa 0x3F8 /* Base of com1 port */ ! 80: #define ALPORTb 0x3E8 /* Base of com3 port */ ! 81: #define ALNUMa 0 /* com1 has com number of 0 */ ! 82: #define ALNUMb 2 /* com3 has com number of 2 */ ! 83: #define ALINT 4 /* Interrupt level of com1_3 ports */ ! 84: #define ALNAME a0con /* CON name of com1_3 ports */ ! 85: #define ALMAJ AL0_MAJOR /* Major number of com1_3 port */ ! 86: #define ALCNT A0CNT /* Number of ports for this IRQ */ ! 87: #define ALSPEEDa C1BAUD /* Name of patchable variable for com1 speed */ ! 88: #define ALSPEEDb C3BAUD /* Name of patchable variable for com3 speed */ ! 89: #endif ! 90: ! 91: #ifdef ALCOM2 /* COM2_4 definitions */ ! 92: #define ALPORTa 0x2F8 /* Base of com2 port */ ! 93: #define ALPORTb 0x2E8 /* Base of com4 port */ ! 94: #define ALNUMa 1 /* com2 has com number of 1 */ ! 95: #define ALNUMb 3 /* com4 has com number of 3 */ ! 96: #define ALINT 3 /* Interrupt level of com2_4 ports */ ! 97: #define ALNAME a1con /* CON name of com2_4 ports */ ! 98: #define ALMAJ AL1_MAJOR /* Major number of com2_4 ports */ ! 99: #define ALCNT A1CNT /* Number of ports for this IRQ */ ! 100: #define ALSPEEDa C2BAUD /* Name of patchable variable for com2 speed */ ! 101: #define ALSPEEDb C4BAUD /* Name of patchable variable for com4 speed */ ! 102: #endif ! 103: ! 104: /* ! 105: * Functions. ! 106: */ ! 107: int alxopen(); ! 108: int alxclose(); ! 109: int alxioctl(); ! 110: int alxtimer(); ! 111: int alxparam(); ! 112: int alxcycle(); ! 113: int alxstart(); ! 114: int alxbreak(); ! 115: ! 116: int alintr(); ! 117: int alopen(); ! 118: int alclose(); ! 119: int alread(); ! 120: int alwrite(); ! 121: static int alioctl(); ! 122: int alload(); ! 123: int alunload(); ! 124: int alpoll(); ! 125: int nulldev(); ! 126: int nonedev(); ! 127: static int alioctl(); ! 128: ! 129: /* ! 130: * Configuration table. ! 131: */ ! 132: CON ALNAME ={ ! 133: DFCHR|DFPOL, /* Flags */ ! 134: ALMAJ, /* Major index */ ! 135: alopen, /* Open */ ! 136: alclose, /* Close */ ! 137: nulldev, /* Block */ ! 138: alread, /* Read */ ! 139: alwrite, /* Write */ ! 140: alioctl, /* Ioctl */ ! 141: nulldev, /* Powerfail */ ! 142: alxtimer, /* Timeout */ ! 143: alload, /* Load */ ! 144: alunload, /* Unload */ ! 145: alpoll /* Poll */ ! 146: }; ! 147: ! 148: /* ! 149: * Terminal structures. ! 150: */ ! 151: static COM_DDP * ddp; ! 152: static TTY * alttab; ! 153: static TTY * irqtty; /* point to alttab entry which is IRQ-enabled */ ! 154: ! 155: /* ! 156: * to change default speeds - patch kernel variables C1BAUD..C4BAUD ! 157: * new value should be one of B0..B9600 in /usr/include/sgtty.h ! 158: */ ! 159: int ALSPEEDa = B9600; ! 160: int ALSPEEDb = B9600; ! 161: ! 162: /* ! 163: * to enable com[34], patch here ! 164: * A0CNT should be 2 if you want com3, 1 otherwise ! 165: * A1CNT should be 2 if you want com4, 1 otherwise ! 166: */ ! 167: int ALCNT = 2; ! 168: ! 169: static ! 170: alload() ! 171: { ! 172: register int s; ! 173: static int init; ! 174: extern int albaud[]; ! 175: int port, i; ! 176: int usa, usb; ! 177: extern int AL_ADDR[]; ! 178: ! 179: /* ! 180: * Set interrupt vector early in case uart_sense() causes bogus irpts. ! 181: */ ! 182: setivec(ALINT, alintr); /* set interrupt vector */ ! 183: usa = uart_sense(AL_ADDR[ALNUMa]); ! 184: usb = uart_sense(AL_ADDR[ALNUMb]); ! 185: putchar('\n'); ! 186: if (usa == US_NONE && usb == US_NONE) { ! 187: ALCNT = 0; ! 188: } else { ! 189: if (usb == US_NONE) ! 190: ALCNT = 1; ! 191: else ! 192: ALCNT = 2; ! 193: } ! 194: if (init == 0 && ALCNT ! 195: && (alttab = (TTY *)kalloc(ALCNT * sizeof(TTY))) ! 196: && (ddp = (COM_DDP *)kalloc(ALCNT * sizeof(COM_DDP)))) { ! 197: kclear(alttab, ALCNT*sizeof(TTY)); ! 198: kclear(ddp, ALCNT*sizeof(COM_DDP)); ! 199: ++init; ! 200: ! 201: s = sphi(); ! 202: alttab[0].t_dispeed = alttab[0].t_dospeed = ALSPEEDa; ! 203: alttab[0].t_ddp = (char *)&ddp[0]; ! 204: tp_table[ALNUMa] = alttab; /* set TTY pointers for polling */ ! 205: ddp[0].port = AL_ADDR[ALNUMa]; ! 206: ddp[0].com_num = ALNUMa; ! 207: com_usage[ALNUMa].uart_type = usa; ! 208: ! 209: if (ALCNT > 1) { ! 210: alttab[1].t_dispeed = alttab[1].t_dospeed = ALSPEEDb; ! 211: alttab[1].t_ddp = (char *)&ddp[1]; ! 212: tp_table[ALNUMb] = alttab+1; ! 213: ddp[1].port = AL_ADDR[ALNUMb]; ! 214: ddp[1].com_num = ALNUMb; ! 215: com_usage[ALNUMb].uart_type = usb; ! 216: } ! 217: ! 218: for (i = 0; i < ALCNT; i++) { ! 219: int speed = alttab[i].t_dospeed; ! 220: ! 221: /* port = base I/O address */ ! 222: port = ((COM_DDP *)(alttab[i].t_ddp))->port; ! 223: outb(port+IER, 0); /* disable port interrupts */ ! 224: outb(port+MCR, 0); /* hangup port */ ! 225: outb(port+LCR, LC_DLAB); ! 226: outb(port+DLL, albaud[speed]); ! 227: outb(port+DLH, albaud[speed] >> 8); ! 228: outb(port+LCR, LC_CS8); ! 229: alttab[i].t_start = alxstart; ! 230: alttab[i].t_param = alxparam; ! 231: alttab[i].t_cs_sel= cs_sel(); ! 232: } ! 233: ! 234: spl(s); ! 235: } else { /* Load failed - no ports or no RAM available! */ ! 236: clrivec(ALINT); ! 237: } ! 238: return; ! 239: } ! 240: ! 241: static ! 242: alunload() ! 243: { ! 244: int port, i; ! 245: ! 246: for (i = 0; i < ALCNT; i++) { ! 247: port = ((COM_DDP *)(alttab[i].t_ddp))->port; ! 248: outb(port+IER, 0); /* disable port interrupts */ ! 249: outb(port+MCR, 0); /* hangup port */ ! 250: timeout(alttab[i].t_rawtim, 0, NULL, 0);/* cancel timer */ ! 251: } ! 252: if (ALCNT) { ! 253: clrivec(ALINT); /* release interrupt vector */ ! 254: kfree(alttab); ! 255: kfree(ddp); ! 256: } ! 257: } ! 258: ! 259: static ! 260: alopen(dev, mode) ! 261: dev_t dev; ! 262: int mode; ! 263: { ! 264: if (minor_st(dev) < ALCNT) { ! 265: alxopen(dev, mode, &DEV_TTY, &irqtty); ! 266: } else ! 267: u.u_error = ENXIO; ! 268: } ! 269: ! 270: static ! 271: alclose(dev, mode) ! 272: dev_t dev; ! 273: int mode; ! 274: { ! 275: /* ! 276: * The real work is in alx.c. ! 277: */ ! 278: alxclose(dev, mode, &DEV_TTY); ! 279: } ! 280: ! 281: static ! 282: alread(dev, iop) ! 283: dev_t dev; ! 284: IO *iop; ! 285: { ! 286: ttread(&DEV_TTY, iop, 0); ! 287: } ! 288: ! 289: static ! 290: alwrite(dev, iop) ! 291: dev_t dev; ! 292: register IO *iop; ! 293: { ! 294: register int c; ! 295: ! 296: /* ! 297: * Treat user writes through tty driver. ! 298: */ ! 299: if (iop->io_seg != IOSYS) { ! 300: ttwrite(&DEV_TTY, iop, 0); ! 301: return; ! 302: } ! 303: ! 304: /* ! 305: * Treat kernel writes by blocking on transmit buffer. ! 306: */ ! 307: while ((c = iogetc(iop)) >= 0) { ! 308: /* ! 309: * Wait until transmit buffer is empty. ! 310: * Check twice to prevent critical race with interrupt handler. ! 311: */ ! 312: for (;;) { ! 313: if (inb(ALPORT+LSR) & LS_TxRDY) ! 314: if (inb(ALPORT+LSR) & LS_TxRDY) ! 315: break; ! 316: } ! 317: ! 318: /* ! 319: * Output the next character. ! 320: */ ! 321: outb(ALPORT+DREG, c); ! 322: } ! 323: } ! 324: ! 325: static int ! 326: alioctl(dev, com, vec) ! 327: dev_t dev; ! 328: struct sgttyb *vec; ! 329: { ! 330: alxioctl(dev, com, vec, &DEV_TTY); ! 331: } ! 332: ! 333: static ! 334: alpoll(dev, ev, msec) ! 335: dev_t dev; ! 336: int ev; ! 337: int msec; ! 338: { ! 339: return ttpoll(&DEV_TTY, ev, msec); ! 340: } ! 341: ! 342: static ! 343: alintr() ! 344: { ! 345: alxintr(irqtty); ! 346: }
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