| 1 | /* if_acc.c 4.1 82/02/01 */ |
| 2 | |
| 3 | #include "acc.h" |
| 4 | #ifdef NACC > 0 |
| 5 | |
| 6 | /* |
| 7 | * ACC LH/DH ARPAnet IMP interface driver. |
| 8 | */ |
| 9 | |
| 10 | #include "../h/param.h" |
| 11 | #include "../h/systm.h" |
| 12 | #include "../h/mbuf.h" |
| 13 | #include "../h/pte.h" |
| 14 | #include "../h/buf.h" |
| 15 | #include "../h/protosw.h" |
| 16 | #include "../h/socket.h" |
| 17 | #include "../h/ubareg.h" |
| 18 | #include "../h/ubavar.h" |
| 19 | #include "../h/accreg.h" |
| 20 | #include "../h/cpu.h" |
| 21 | #include "../h/mtpr.h" |
| 22 | #include "../h/vmmac.h" |
| 23 | #include "../net/in.h" |
| 24 | #include "../net/in_systm.h" |
| 25 | #include "../net/if.h" |
| 26 | #include "../net/if_imp.h" |
| 27 | #include "../net/if_uba.h" |
| 28 | |
| 29 | int accprobe(), accattach(), accrint(), accxint(); |
| 30 | struct uba_device *accinfo[NACC]; |
| 31 | u_short accstd[] = { 0 }; |
| 32 | struct uba_driver accdriver = |
| 33 | { accprobe, 0, accattach, 0, accstd, "acc", accinfo }; |
| 34 | #define ACCUNIT(x) minor(x) |
| 35 | |
| 36 | int accinit(), accstart(), accreset(); |
| 37 | |
| 38 | /* |
| 39 | * "Lower half" of IMP interface driver. |
| 40 | * |
| 41 | * Each IMP interface is handled by a common module which handles |
| 42 | * the IMP-host protocol and a hardware driver which manages the |
| 43 | * hardware specific details of talking with the IMP. |
| 44 | * |
| 45 | * The hardware portion of the IMP driver handles DMA and related |
| 46 | * management of UNIBUS resources. The IMP protocol module interprets |
| 47 | * contents of these messages and "controls" the actions of the |
| 48 | * hardware module during IMP resets, but not, for instance, during |
| 49 | * UNIBUS resets. |
| 50 | * |
| 51 | * The two modules are coupled at "attach time", and ever after, |
| 52 | * through the imp interface structure. Higher level protocols, |
| 53 | * e.g. IP, interact with the IMP driver, rather than the ACC. |
| 54 | */ |
| 55 | struct acc_softc { |
| 56 | struct ifnet *acc_if; /* pointer to IMP's ifnet struct */ |
| 57 | struct impcb *acc_ic; /* data structure shared with IMP */ |
| 58 | struct ifuba acc_ifuba; /* UNIBUS resources */ |
| 59 | struct mbuf *acc_iq; /* input reassembly queue */ |
| 60 | short acc_olen; /* size of last message sent */ |
| 61 | char acc_flush; /* flush remainder of message */ |
| 62 | char acc_previous; /* something on input queue */ |
| 63 | } acc_softc[NACC]; |
| 64 | |
| 65 | /* |
| 66 | * Reset the IMP and cause a transmitter interrupt by |
| 67 | * performing a null DMA. |
| 68 | */ |
| 69 | accprobe(reg) |
| 70 | caddr_t reg; |
| 71 | { |
| 72 | register int br, cvec; /* r11, r10 value-result */ |
| 73 | register struct accdevice *addr = (struct accdevice *)reg; |
| 74 | |
| 75 | COUNT(ACCPROBE); |
| 76 | #ifdef lint |
| 77 | br = 0; cvec = br; br = cvec; |
| 78 | accrint(0); accxint(0); |
| 79 | #endif |
| 80 | addr->acc_icsr = ACC_RESET; |
| 81 | DELAY(500000); |
| 82 | addr->acc_ocsr = ACC_RESET; |
| 83 | DELAY(500000); |
| 84 | |
| 85 | addr->acc_ocsr = OUT_BBACK; |
| 86 | DELAY(500000); |
| 87 | addr->acc_owc = 0; |
| 88 | addr->acc_ocsr = ACC_IE | ACC_GO; |
| 89 | DELAY(500000); |
| 90 | addr->acc_ocsr = 0; |
| 91 | /* interrupt was for transmit, push back to receive vector */ |
| 92 | if (cvec && cvec != 0x200) |
| 93 | cvec -= 4; |
| 94 | return (1); |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Call the IMP module to allow it to set up its internal |
| 99 | * state, then tie the two modules together by setting up |
| 100 | * the back pointers to common data structures. |
| 101 | */ |
| 102 | accattach(ui) |
| 103 | struct uba_device *ui; |
| 104 | { |
| 105 | register struct acc_softc *sc = &acc_softc[ui->ui_unit]; |
| 106 | register struct impcb *ip; |
| 107 | struct ifimpcb { |
| 108 | struct ifnet ifimp_if; |
| 109 | struct impcb ifimp_impcb; |
| 110 | } *ifimp; |
| 111 | |
| 112 | COUNT(ACCATTACH); |
| 113 | if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0) |
| 114 | panic("accattach"); /* XXX */ |
| 115 | sc->acc_if = &ifimp->ifimp_if; |
| 116 | ip = &ifimp->ifimp_impcb; |
| 117 | sc->acc_ic = ip; |
| 118 | ip->ic_init = accinit; |
| 119 | ip->ic_start = accstart; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Reset interface after UNIBUS reset. |
| 124 | * If interface is on specified uba, reset its state. |
| 125 | */ |
| 126 | accreset(unit, uban) |
| 127 | int unit, uban; |
| 128 | { |
| 129 | register struct uba_device *ui; |
| 130 | struct acc_softc *sc; |
| 131 | |
| 132 | COUNT(ACCRESET); |
| 133 | if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || |
| 134 | ui->ui_ubanum != uban) |
| 135 | return; |
| 136 | printf(" acc%d", unit); |
| 137 | sc = &acc_softc[unit]; |
| 138 | /* must go through IMP to allow it to set state */ |
| 139 | (*sc->acc_if->if_init)(unit); |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Initialize interface: clear recorded pending operations, |
| 144 | * and retrieve, and reinitialize UNIBUS resources. |
| 145 | */ |
| 146 | accinit(unit) |
| 147 | int unit; |
| 148 | { |
| 149 | register struct acc_softc *sc = &acc_softc[unit]; |
| 150 | register struct uba_device *ui = accinfo[unit]; |
| 151 | register struct accdevice *addr; |
| 152 | int x, info; |
| 153 | |
| 154 | COUNT(ACCINIT); |
| 155 | if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, |
| 156 | sizeof(struct imp_leader), (int)btop(IMP_MTU)) == 0) { |
| 157 | printf("acc%d: can't initialize\n", unit); |
| 158 | return; |
| 159 | } |
| 160 | addr = (struct accdevice *)ui->ui_addr; |
| 161 | |
| 162 | /* reset the imp interface. */ |
| 163 | x = spl5(); |
| 164 | addr->acc_icsr = ACC_RESET; |
| 165 | addr->acc_ocsr = ACC_RESET; |
| 166 | addr->acc_ocsr = OUT_BBACK; /* reset host master ready */ |
| 167 | addr->acc_ocsr = 0; |
| 168 | addr->acc_icsr = IN_MRDY; /* close the relay */ |
| 169 | splx(x); |
| 170 | |
| 171 | /* YECH!!! */ |
| 172 | while ((addr->acc_icsr & IN_HRDY) == 0 || |
| 173 | (addr->acc_icsr & (IN_RMR | IN_IMPBSY))) { |
| 174 | /* keep turning IN_RMR off */ |
| 175 | addr->acc_icsr = IN_MRDY; |
| 176 | sleep((caddr_t)&lbolt, PZERO); |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Put up a read. We can't restart any outstanding writes |
| 181 | * until we're back in synch with the IMP (i.e. we've flushed |
| 182 | * the NOOPs it throws at us). |
| 183 | */ |
| 184 | x = spl5(); |
| 185 | info = sc->acc_ifuba.ifu_r.ifrw_info; |
| 186 | addr->acc_iba = (u_short)info; |
| 187 | addr->acc_iwc = -(sizeof(struct imp_leader) + IMP_MTU) >> 1; |
| 188 | addr->acc_icsr = |
| 189 | IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; |
| 190 | splx(x); |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Start output on an interface. |
| 195 | */ |
| 196 | accstart(dev) |
| 197 | dev_t dev; |
| 198 | { |
| 199 | int unit = ACCUNIT(dev), info; |
| 200 | struct uba_device *ui = accinfo[unit]; |
| 201 | register struct acc_softc *sc = &acc_softc[unit]; |
| 202 | register struct accdevice *addr; |
| 203 | struct mbuf *m; |
| 204 | u_short cmd; |
| 205 | |
| 206 | COUNT(ACCSTART); |
| 207 | if (sc->acc_ic->ic_oactive) |
| 208 | goto restart; |
| 209 | |
| 210 | /* |
| 211 | * Not already active, deqeue a request and |
| 212 | * map it onto the UNIBUS. If no more |
| 213 | * requeusts, just return. |
| 214 | */ |
| 215 | IF_DEQUEUE(&sc->acc_if->if_snd, m); |
| 216 | if (m == 0) { |
| 217 | sc->acc_ic->ic_oactive = 0; |
| 218 | return; |
| 219 | } |
| 220 | sc->acc_olen = if_wubaput(&sc->acc_ifuba, m); |
| 221 | |
| 222 | restart: |
| 223 | /* |
| 224 | * Have request mapped to UNIBUS for transmission. |
| 225 | * Purge any stale data from the BDP, and start the output. |
| 226 | */ |
| 227 | UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp); |
| 228 | addr = (struct accdevice *)ui->ui_addr; |
| 229 | info = sc->acc_ifuba.ifu_w.ifrw_info; |
| 230 | addr->acc_oba = (u_short)info; |
| 231 | addr->acc_owc = -((sc->acc_olen + 1) >> 1); |
| 232 | cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO; |
| 233 | addr->acc_ocsr = cmd; |
| 234 | sc->acc_ic->ic_oactive = 1; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * Output interrupt handler. |
| 239 | */ |
| 240 | accxint(unit) |
| 241 | { |
| 242 | register struct uba_device *ui = accinfo[unit]; |
| 243 | register struct acc_softc *sc = &acc_softc[unit]; |
| 244 | register struct accdevice *addr; |
| 245 | |
| 246 | COUNT(ACCXINT); |
| 247 | if (sc->acc_ic->ic_oactive == 0) { |
| 248 | printf("acc%d: stray output interrupt\n", unit); |
| 249 | return; |
| 250 | } |
| 251 | addr = (struct accdevice *)ui->ui_addr; |
| 252 | sc->acc_if->if_opackets++; |
| 253 | sc->acc_ic->ic_oactive = 0; |
| 254 | if (addr->acc_ocsr & ACC_ERR) |
| 255 | printf("acc%d: output error, csr=%b\n", unit, |
| 256 | addr->acc_ocsr, ACC_OUTBITS); |
| 257 | if (sc->acc_if->if_snd.ifq_head == 0) { |
| 258 | sc->acc_if->if_oerrors++; |
| 259 | if (sc->acc_ifuba.ifu_xtofree) { |
| 260 | m_freem(sc->acc_ifuba.ifu_xtofree); |
| 261 | sc->acc_ifuba.ifu_xtofree = 0; |
| 262 | } |
| 263 | return; |
| 264 | } |
| 265 | accstart(unit); |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Input interrupt handler |
| 270 | */ |
| 271 | accrint(unit) |
| 272 | { |
| 273 | register struct acc_softc *sc = &acc_softc[unit]; |
| 274 | register struct accdevice *addr; |
| 275 | register struct ifqueue *inq; |
| 276 | struct mbuf *m; |
| 277 | int len, info; |
| 278 | |
| 279 | COUNT(ACCRINT); |
| 280 | sc->acc_if->if_ipackets++; |
| 281 | |
| 282 | /* |
| 283 | * Purge BDP; flush message if error indicated. |
| 284 | */ |
| 285 | UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); |
| 286 | addr = (struct accdevice *)accinfo[unit]->ui_addr; |
| 287 | if (addr->acc_icsr & ACC_ERR) { |
| 288 | printf("acc%d: recv error, csr=%b\n", unit, |
| 289 | addr->acc_icsr, ACC_INBITS); |
| 290 | sc->acc_if->if_ierrors++; |
| 291 | sc->acc_flush = 1; |
| 292 | } |
| 293 | |
| 294 | if (sc->acc_flush) { |
| 295 | if (addr->acc_icsr & IN_EOM) |
| 296 | sc->acc_flush = 0; |
| 297 | goto setup; |
| 298 | } |
| 299 | len = sizeof(struct imp_leader) + (addr->acc_iwc << 1); |
| 300 | |
| 301 | /* |
| 302 | * The last parameter is always 0 since using |
| 303 | * trailers on the ARPAnet is insane. |
| 304 | */ |
| 305 | m = if_rubaget(&sc->acc_ifuba, len, 0); |
| 306 | if (m == 0) |
| 307 | goto setup; |
| 308 | if ((addr->acc_icsr & IN_EOM) == 0) { |
| 309 | if (sc->acc_previous) |
| 310 | m_cat(sc->acc_iq, m); |
| 311 | else { |
| 312 | sc->acc_iq = m; |
| 313 | sc->acc_previous = 1; |
| 314 | } |
| 315 | goto setup; |
| 316 | } |
| 317 | /* adjust message length for padding. */ |
| 318 | m->m_len -= 2; |
| 319 | if (sc->acc_previous) { |
| 320 | m_cat(sc->acc_iq, m); |
| 321 | m = sc->acc_iq; |
| 322 | sc->acc_iq = 0; |
| 323 | sc->acc_previous = 0; |
| 324 | } |
| 325 | impinput(unit, m); |
| 326 | |
| 327 | setup: |
| 328 | /* |
| 329 | * Setup for next message. |
| 330 | */ |
| 331 | info = sc->acc_ifuba.ifu_r.ifrw_info; |
| 332 | addr->acc_iba = (u_short)info; |
| 333 | addr->acc_iwc = - (sizeof(struct imp_leader) + IMP_MTU) >> 1; |
| 334 | addr->acc_icsr = |
| 335 | IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; |
| 336 | } |
| 337 | #endif |