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1.1 root 1:
2: /* @(#)tmscp.c 7.3 (Berkeley) 3/4/88 */
3:
4: /****************************************************************
5: * *
6: * Licensed from Digital Equipment Corporation *
7: * Copyright (c) *
8: * Digital Equipment Corporation *
9: * Maynard, Massachusetts *
10: * 1985, 1986 *
11: * All rights reserved. *
12: * *
13: * The Information in this software is subject to change *
14: * without notice and should not be construed as a commitment *
15: * by Digital Equipment Corporation. Digital makes no *
16: * representations about the suitability of this software for *
17: * any purpose. It is supplied "As Is" without expressed or *
18: * implied warranty. *
19: * *
20: * If the Regents of the University of California or its *
21: * licensees modify the software in a manner creating *
22: * diriviative copyright rights, appropriate copyright *
23: * legends may be placed on the drivative work in addition *
24: * to that set forth above. *
25: ***************************************************************/
26: /*
27: * tmscp.c - TMSCP (TK50/TU81) standalone driver
28: */
29:
30: # ifndef lint
31: static char *sccsid = "@(#)tmscp.c 1.5 (ULTRIX) 4/18/86";
32: # endif not lint
33:
34: /* ------------------------------------------------------------------------
35: * Modification History: /sys/stand/tmscp.c
36: *
37: * 3-15-85 afd
38: * Don't ask for an interrupt when commands are issued and
39: * check ownership bit in the response descriptor to detect when a
40: * command is complete. Necessary due to the TU81's failure to set
41: * the response interrupt field in the communications area.
42: *
43: * ------------------------------------------------------------------------
44: */
45:
46: #include "param.h"
47: #include "inode.h"
48: #include "fs.h"
49:
50: #include "../vax/pte.h"
51:
52: #include "savax.h"
53: #include "saio.h"
54:
55: /*
56: * Parameters for the communications area
57: * (Only 1 cmd & 1 rsp packet)
58: */
59: #define NRSPL2 0
60: #define NCMDL2 0
61: #define NRSP (1<<NRSPL2)
62: #define NCMD (1<<NCMDL2)
63:
64: #include "../vaxuba/tmscpreg.h"
65: #include "../vaxuba/ubareg.h"
66: #include "../vax/tmscp.h"
67:
68: #define MAXCTLR 1 /* all addresses must be specified */
69: u_short tmscpstd[MAXCTLR] = { 0174500 };
70:
71: struct iob ctmscpbuf;
72:
73: struct tmscpdevice *tmscpaddr = 0;
74:
75: struct tmscp {
76: struct tmscpca tmscp_ca;
77: struct mscp tmscp_rsp;
78: struct mscp tmscp_cmd;
79: } tmscp;
80:
81: struct tmscp *tmscp_ubaddr; /* Unibus address of tmscp structure */
82:
83: struct mscp *tmscpcmd();
84:
85: int tmscp_offline = 1; /* Flag to prevent multiple STCON */
86: int tms_offline[4] = {1,1,1,1}; /* Flag to prevent multiple ONLIN */
87:
88: /*
89: * Open a tmscp device. Initialize the controller and set the unit online.
90: */
91: tmscpopen(io)
92: register struct iob *io;
93: {
94: register struct mscp *mp;
95: int i;
96:
97: if ((u_int)io->i_ctlr >= MAXCTLR)
98: return (ECTLR);
99: /*
100: * Have the tmscp controller characteristics already been set up
101: * (STCON)?
102: */
103: if (tmscp_offline) {
104: if (tmscpaddr == 0)
105: tmscpaddr = (struct tmscpdevice *)ubamem(io->i_adapt, tmscpstd[0]);
106: if (tmscp_ubaddr == 0) {
107: ctmscpbuf.i_unit = io->i_unit;
108: ctmscpbuf.i_ma = (caddr_t)&tmscp;
109: ctmscpbuf.i_cc = sizeof(tmscp);
110: tmscp_ubaddr = (struct tmscp *)ubasetup(&ctmscpbuf, 2);
111: }
112: /*
113: * Initialize the tmscp device and wait for the 4 steps
114: * to complete.
115: */
116: tmscpaddr->tmscpip = 0;
117: while ((tmscpaddr->tmscpsa & TMSCP_STEP1) == 0);
118: tmscpaddr->tmscpsa =TMSCP_ERR|(NCMDL2<<11)|(NRSPL2<<8);
119:
120: while ((tmscpaddr->tmscpsa & TMSCP_STEP2) == 0);
121: # define STEP1MASK 0174377
122: # define STEP1GOOD (TMSCP_STEP2|TMSCP_IE|(NCMDL2<<3)|NRSPL2)
123: if ((tmscpaddr->tmscpsa&STEP1MASK) != STEP1GOOD)
124: printf("tmscpopen: step 1 not successful sa=%o\n",tmscpaddr->tmscpsa&0xffff);
125: tmscpaddr->tmscpsa = (short)&tmscp_ubaddr->tmscp_ca.ca_ringbase;
126:
127: while ((tmscpaddr->tmscpsa & TMSCP_STEP3) == 0);
128: # define STEP2MASK 0174377
129: # define STEP2GOOD (TMSCP_STEP3)
130: if ((tmscpaddr->tmscpsa&STEP2MASK) != STEP2GOOD)
131: printf("tmscpopen: step 2 not successful sa=%o\n",tmscpaddr->tmscpsa&0xffff);
132: tmscpaddr->tmscpsa = (short)(((int)&tmscp_ubaddr->tmscp_ca.ca_ringbase) >> 16);
133:
134: while ((tmscpaddr->tmscpsa & TMSCP_STEP4) == 0);
135: # define STEP3MASK 0174000
136: # define STEP3GOOD TMSCP_STEP4
137: if ((tmscpaddr->tmscpsa&STEP3MASK) != STEP3GOOD)
138: printf("tmscpopen: step 3 not successful sa=%o\n",tmscpaddr->tmscpsa&0xffff);
139: tmscpaddr->tmscpsa = TMSCP_GO;
140:
141: /*
142: * Init cmd & rsp area
143: */
144: tmscp.tmscp_ca.ca_cmddsc[0] = (long)&tmscp_ubaddr->tmscp_cmd.mscp_cmdref;
145: tmscp.tmscp_cmd.mscp_dscptr = tmscp.tmscp_ca.ca_cmddsc;
146: tmscp.tmscp_cmd.mscp_header.tmscp_vcid = 1; /* for tape */
147:
148: tmscp.tmscp_ca.ca_rspdsc[0] = (long)&tmscp_ubaddr->tmscp_rsp.mscp_cmdref;
149: tmscp.tmscp_rsp.mscp_dscptr = tmscp.tmscp_ca.ca_rspdsc;
150: tmscp.tmscp_cmd.mscp_cntflgs = 0;
151: if (tmscpcmd(M_OP_STCON, 0) == 0) {
152: printf("tms: open error, STCON\n");
153: return (EIO);
154: }
155: tmscp_offline = 0;
156: }
157: tmscp.tmscp_cmd.mscp_unit = io->i_unit&03;
158: /*
159: * Has this unit been issued an ONLIN?
160: */
161: if (tms_offline[tmscp.tmscp_cmd.mscp_unit]) {
162: if ((mp = tmscpcmd(M_OP_ONLIN, 0)) == 0) {
163: _stop("tms: open error, ONLIN\n");
164: return (EIO);
165: }
166: tms_offline[tmscp.tmscp_cmd.mscp_unit] = 0;
167: }
168: /*
169: * This makes no sense, but I could be wrong... KB
170: *
171: * if ((u_int)io->i_part > 3)
172: * return (EPART);
173: */
174: if (io->i_part) {
175: /*
176: * Skip forward the appropriate number of files on the tape.
177: */
178: tmscp.tmscp_cmd.mscp_tmkcnt = io->i_part;
179: (void)tmscpcmd(M_OP_REPOS, 0);
180: tmscp.tmscp_cmd.mscp_tmkcnt = 0;
181: }
182: return (0);
183: }
184:
185: /*
186: * Close the device (rewind it to BOT)
187: */
188: tmscpclose(io)
189: register struct iob *io;
190: {
191: (void)tmscpcmd(M_OP_REPOS, M_MD_REWND);
192: }
193:
194: /*
195: * Set up tmscp command packet. Cause the controller to poll to pick up
196: * the command.
197: */
198: struct mscp *
199: tmscpcmd(op,mod)
200: int op, mod; /* opcode and modifier (usu 0) */
201: {
202: struct mscp *mp; /* ptr to cmd packet */
203: int i; /* read into to init polling */
204:
205: tmscp.tmscp_cmd.mscp_opcode = op;
206: tmscp.tmscp_cmd.mscp_modifier = mod;
207: tmscp.tmscp_cmd.mscp_header.tmscp_msglen = mscp_msglen;
208: tmscp.tmscp_ca.ca_cmddsc[0] |= TMSCP_OWN; /* | TMSCP_INT */
209: tmscp.tmscp_rsp.mscp_header.tmscp_msglen = mscp_msglen;
210: tmscp.tmscp_ca.ca_rspdsc[0] |= TMSCP_OWN; /* | TMSCP_INT */
211:
212: i = tmscpaddr->tmscpip;
213: for (;;) {
214: if (tmscpaddr->tmscpsa & TMSCP_ERR) {
215: printf("tmscpcmd: Fatal error sa=%o\n", tmscpaddr->tmscpsa & 0xffff);
216: return(0);
217: }
218:
219: if (tmscp.tmscp_ca.ca_cmdint)
220: tmscp.tmscp_ca.ca_cmdint = 0;
221: /*
222: * This is to handle the case of devices not setting the
223: * interrupt field in the communications area. Some
224: * devices (early TU81's) only clear the ownership field
225: * in the Response Descriptor.
226: *
227: *
228: * if (tmscp.tmscp_ca.ca_rspint)
229: * break;
230: */
231: if (!(tmscp.tmscp_ca.ca_rspdsc[0] & (TMSCP_OWN)))
232: break;
233: }
234: tmscp.tmscp_ca.ca_rspint = 0;
235: mp = &tmscp.tmscp_rsp;
236: if (mp->mscp_opcode != (op|M_OP_END) ||
237: (mp->mscp_status&M_ST_MASK) != M_ST_SUCC) {
238: /*
239: * Detect hitting tape mark. This signifies the end of the
240: * tape mini-root file. We don't want to return an error
241: * condition to the strategy routine.
242: */
243: if ((mp->mscp_status & M_ST_MASK) != M_ST_TAPEM)
244: return(0);
245: }
246: return(mp);
247: }
248:
249: /*
250: * Set up to do reads and writes; call tmscpcmd to issue the cmd.
251: */
252: tmscpstrategy(io, func)
253: register struct iob *io;
254: int func;
255: {
256: register struct mscp *mp;
257: int ubinfo;
258:
259: ubinfo = ubasetup(io, 1);
260: mp = &tmscp.tmscp_cmd;
261: mp->mscp_lbn = io->i_bn;
262: mp->mscp_unit = io->i_unit&03;
263: mp->mscp_bytecnt = io->i_cc;
264: mp->mscp_buffer = (ubinfo & 0x3fffff) | (((ubinfo>>28)&0xf)<<24);
265: if ((mp = tmscpcmd(func == READ ? M_OP_READ : M_OP_WRITE, 0)) == 0) {
266: ubafree(io, ubinfo);
267: printf("tms: I/O error\n");
268: return(-1);
269: }
270: ubafree(io, ubinfo);
271: /*
272: * Detect hitting tape mark so we do it gracefully and return a
273: * character count of 0 to signify end of copy. Rewind the tape
274: * before returning.
275: */
276: if ((mp->mscp_status & M_ST_MASK) == M_ST_TAPEM)
277: return(0);
278: return(io->i_cc);
279: }
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