| 1 | /* va.c 3.1 %H% */ |
| 2 | |
| 3 | #ifdef ERNIE |
| 4 | #include "../h/param.h" |
| 5 | #include "../h/dir.h" |
| 6 | #include "../h/user.h" |
| 7 | #include "../h/buf.h" |
| 8 | #include "../h/systm.h" |
| 9 | #include "../h/map.h" |
| 10 | #include "../h/pte.h" |
| 11 | #include "../h/uba.h" |
| 12 | #include "../h/vcmd.h" |
| 13 | |
| 14 | /* |
| 15 | * Benson-Varian matrix printer/plotter. Device "va", for "varian". |
| 16 | * dma interface driver |
| 17 | */ |
| 18 | int vabdp = 1; /* Used with ubasetup. */ |
| 19 | |
| 20 | unsigned minvaph(); /* Maximum amount transferred by physio. */ |
| 21 | |
| 22 | #define VAPRI (PZERO-1) |
| 23 | |
| 24 | struct varegs { /* Unibus registers provided by va. */ |
| 25 | unsigned short vabufaddr; /* DMA buffer address. */ |
| 26 | short vawcount; /* Negative of number of 16-bit |
| 27 | words to transfer by DMA. */ |
| 28 | union { |
| 29 | short vacsrword; /* csr addressed as a word (for R). */ |
| 30 | struct { |
| 31 | char Vacsrlo; |
| 32 | char Vacsrhi; /* High byte (command bytes go here). */ |
| 33 | } vacsrbytes; /* csr addressed as bytes (for W). */ |
| 34 | } vacsr; /* Control/Status Register (csr). */ |
| 35 | short vadata; |
| 36 | }; |
| 37 | |
| 38 | #define vacsrhi vacsr.vacsrbytes.Vacsrhi |
| 39 | #define vacsrlo vacsr.vacsrbytes.Vacsrlo |
| 40 | #define VAADDR ((struct varegs *)(UBA0_DEV + 0164000)) |
| 41 | |
| 42 | /* vacsr.vacsrword bits: */ |
| 43 | #define ERROR 0100000 /* R Some error has occurred */ |
| 44 | #define NPRTIMO 01000 /* R DMA timeout error */ |
| 45 | #define NOTREADY 0400 /* R Something besides NPRTIMO */ |
| 46 | #define DONE 0200 /* R */ |
| 47 | #define IENABLE 0100 /* R/W Interrupt enable */ |
| 48 | #define SUPPLIESLOW 04 /* R */ |
| 49 | #define BOTOFFORM 02 /* R */ |
| 50 | #define BYTEREVERSE 01 /* R/W Reverse byte order in words */ |
| 51 | |
| 52 | /* Command bytes sent to vacsrhi */ |
| 53 | #define VAPLOT 0340 |
| 54 | #define VAPRINT 0100 |
| 55 | #define VAPRINTPLOT 0160 |
| 56 | #define VAAUTOSTEP 0244 |
| 57 | /* The following commands are not used in this driver: */ |
| 58 | #define VANOAUTOSTEP 0045 |
| 59 | #define VAFORMFEED 0263 |
| 60 | #define VASLEW 0265 |
| 61 | #define VASTEP 0064 |
| 62 | |
| 63 | struct { |
| 64 | char va_is_open; |
| 65 | char va_busy; |
| 66 | int va_state; /* State: bits are commands in vcmd.h. */ |
| 67 | int va_wcount; |
| 68 | int va_bufp; |
| 69 | } vainfo; |
| 70 | int va_ubinfo; |
| 71 | |
| 72 | struct buf rvabuf; /* Used by physio for a buffer. */ |
| 73 | |
| 74 | vaopen() |
| 75 | { |
| 76 | |
| 77 | if (vainfo.va_is_open) { /* Can't open if it's already open. */ |
| 78 | u.u_error = ENXIO; |
| 79 | return; |
| 80 | } |
| 81 | vainfo.va_is_open = 1; /* NOW it's open! */ |
| 82 | VAADDR->vawcount = 0; /* Clear residual errors */ |
| 83 | vainfo.va_wcount = 0; /* No DMA to do now. */ |
| 84 | vainfo.va_state = 0; |
| 85 | VAADDR->vacsrlo = IENABLE; |
| 86 | /* Enable interrupts. */ |
| 87 | vatimo(); |
| 88 | |
| 89 | vacmd(VPRINT); /* Start in print mode. */ |
| 90 | if (u.u_error) |
| 91 | vaclose(); |
| 92 | } |
| 93 | |
| 94 | vastrategy(bp) |
| 95 | register struct buf *bp; |
| 96 | { |
| 97 | register int e; |
| 98 | |
| 99 | VOID spl4(); |
| 100 | while (vainfo.va_busy) /* Wait till not busy. */ |
| 101 | sleep((caddr_t)&vainfo, VAPRI); |
| 102 | vainfo.va_busy = 1; /* Grab it. */ |
| 103 | VOID spl0(); |
| 104 | |
| 105 | va_ubinfo = ubasetup(bp, vabdp); /* Set up uba mapper. */ |
| 106 | vainfo.va_bufp = va_ubinfo & 0x3ffff; |
| 107 | |
| 108 | VOID spl4(); |
| 109 | if (e = vaerror(DONE)) |
| 110 | goto brkout; |
| 111 | vainfo.va_wcount = -(bp->b_bcount/2); |
| 112 | /* va uses a word count, |
| 113 | so user had better supply an even number of bytes. */ |
| 114 | vastart(); |
| 115 | e = vaerror(DONE); /* Wait for DMA to complete. */ |
| 116 | vainfo.va_wcount = 0; /* Reset state info. */ |
| 117 | vainfo.va_bufp = 0; |
| 118 | |
| 119 | /* After printing a line of characters, VPRINTPLOT mode essentially |
| 120 | reverts to VPLOT mode, plotting things until a new mode is set. |
| 121 | This change is indicated by sending a VAAUTOSTEP command to |
| 122 | the va. We also change va_state to reflect this effective |
| 123 | mode change. |
| 124 | */ |
| 125 | if (vainfo.va_state & VPRINTPLOT) { |
| 126 | vainfo.va_state = (vainfo.va_state & ~VPRINTPLOT) | VPLOT; |
| 127 | VAADDR->vacsrhi = VAAUTOSTEP; |
| 128 | e |= vaerror(DONE); |
| 129 | } |
| 130 | VOID spl0(); |
| 131 | brkout: |
| 132 | ubafree(va_ubinfo), va_ubinfo = 0; |
| 133 | vainfo.va_busy = 0; |
| 134 | iodone(bp); |
| 135 | if (e) |
| 136 | u.u_error = EIO; |
| 137 | wakeup((caddr_t)&vainfo); |
| 138 | } |
| 139 | |
| 140 | int vablock = 16384; |
| 141 | |
| 142 | unsigned |
| 143 | minvaph(bp) |
| 144 | struct buf *bp; |
| 145 | { |
| 146 | if (bp->b_bcount > vablock) |
| 147 | bp->b_bcount = vablock; |
| 148 | } |
| 149 | |
| 150 | /*ARGSUSED*/ |
| 151 | vawrite(dev) |
| 152 | { |
| 153 | physio(vastrategy, &rvabuf, dev, B_WRITE, minvaph); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Vaerror waits until bit or ERROR gets set, then returns non-zero if |
| 158 | * if it was ERROR that was set. |
| 159 | */ |
| 160 | vaerror(bit) |
| 161 | { |
| 162 | register int e; |
| 163 | |
| 164 | while ((e = VAADDR->vacsr.vacsrword & (bit|ERROR)) == 0) |
| 165 | sleep((caddr_t)&vainfo, VAPRI); |
| 166 | return (e & ERROR); |
| 167 | } |
| 168 | |
| 169 | /* vastart starts up the DMA by setting the buffer pointer and the word count. */ |
| 170 | vastart() |
| 171 | { |
| 172 | if (vainfo.va_wcount) { |
| 173 | VAADDR->vabufaddr = vainfo.va_bufp; |
| 174 | VAADDR->vawcount = vainfo.va_wcount; |
| 175 | return; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | /*ARGSUSED*/ |
| 180 | vaioctl(dev, cmd, addr, flag) |
| 181 | register caddr_t addr; |
| 182 | { |
| 183 | register int vcmd; |
| 184 | |
| 185 | switch (cmd) { |
| 186 | |
| 187 | case VGETSTATE: |
| 188 | VOID suword(addr, vainfo.va_state); |
| 189 | return; |
| 190 | |
| 191 | case VSETSTATE: |
| 192 | vcmd = fuword(addr); |
| 193 | if (vcmd == -1) { |
| 194 | u.u_error = EFAULT; |
| 195 | return; |
| 196 | } |
| 197 | vacmd(vcmd); |
| 198 | return; |
| 199 | |
| 200 | default: |
| 201 | u.u_error = ENOTTY; /* Not a legal ioctl cmd. */ |
| 202 | return; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | /* vacmd sends a command code to the va, and waits for it to complete. |
| 207 | If an error occurs, u.u_error is set to EIO. |
| 208 | vacmd also updates vainfo.va_state. |
| 209 | */ |
| 210 | |
| 211 | vacmd(vcmd) |
| 212 | { |
| 213 | VOID spl4(); |
| 214 | VOID vaerror(DONE); /* Wait for va to be ready. */ |
| 215 | switch (vcmd) { |
| 216 | |
| 217 | case VPLOT: |
| 218 | /* Must turn on plot AND autostep modes. */ |
| 219 | VAADDR->vacsrhi = VAPLOT; |
| 220 | if (vaerror(DONE)) |
| 221 | u.u_error = EIO; |
| 222 | VAADDR->vacsrhi = VAAUTOSTEP; |
| 223 | break; |
| 224 | |
| 225 | case VPRINT: |
| 226 | VAADDR->vacsrhi = VAPRINT; |
| 227 | break; |
| 228 | |
| 229 | case VPRINTPLOT: |
| 230 | VAADDR->vacsrhi = VAPRINTPLOT; |
| 231 | break; |
| 232 | } |
| 233 | vainfo.va_state = |
| 234 | (vainfo.va_state & ~(VPLOT | VPRINT | VPRINTPLOT)) | vcmd; |
| 235 | |
| 236 | if (vaerror(DONE)) /* Wait for command to complete. */ |
| 237 | u.u_error = EIO; |
| 238 | VOID spl0(); |
| 239 | } |
| 240 | |
| 241 | vatimo() |
| 242 | { |
| 243 | if (vainfo.va_is_open) |
| 244 | timeout(vatimo, (caddr_t)0, HZ/10); |
| 245 | vaintr(0); |
| 246 | } |
| 247 | |
| 248 | /*ARGSUSED*/ |
| 249 | vaintr(dev) |
| 250 | { |
| 251 | wakeup((caddr_t)&vainfo); |
| 252 | } |
| 253 | |
| 254 | vaclose() |
| 255 | { |
| 256 | |
| 257 | vainfo.va_is_open = 0; |
| 258 | vainfo.va_busy = 0; |
| 259 | vainfo.va_state = 0; |
| 260 | vainfo.va_wcount = 0; |
| 261 | vainfo.va_bufp = 0; |
| 262 | VAADDR->vacsrlo = 0; |
| 263 | } |
| 264 | #endif |