bsd_fdintr.s revision 1.21
1 /* $NetBSD: bsd_fdintr.s,v 1.21 2002/06/24 09:24:37 pk Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Paul Kranenburg 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Paul Kranenburg. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 * 32 */ 33 34 #ifndef FDC_C_HANDLER 35 #include "assym.h" 36 #include <machine/param.h> 37 #include <machine/asm.h> 38 #include <machine/psl.h> 39 #include <sparc/sparc/intreg.h> 40 #include <sparc/sparc/auxreg.h> 41 #include <sparc/sparc/vaddrs.h> 42 #include <sparc/dev/fdreg.h> 43 #include <sparc/dev/fdvar.h> 44 45 #define FD_SET_SWINTR_4C \ 46 sethi %hi(INTRREG_VA), %l5; \ 47 ldub [%l5 + %lo(INTRREG_VA)], %l6; \ 48 or %l6, IE_L4, %l6; \ 49 stb %l6, [%l5 + %lo(INTRREG_VA)] 50 51 ! raise(0,PIL_FDSOFT) ! NOTE: CPU#0 and PIL_FDSOFT=4 52 #define FD_SET_SWINTR_4M \ 53 sethi %hi(PINTR_SINTRLEV(PIL_FDSOFT)), %l5; \ 54 set ICR_PI_SET, %l6; \ 55 st %l5, [%l6] 56 57 /* set software interrupt */ 58 #if (defined(SUN4) || defined(SUN4C)) && !defined(SUN4M) 59 #define FD_SET_SWINTR FD_SET_SWINTR_4C 60 #elif !(defined(SUN4) || defined(SUN4C)) && defined(SUN4M) 61 #define FD_SET_SWINTR FD_SET_SWINTR_4M 62 #else 63 #define FD_SET_SWINTR \ 64 sethi %hi(_C_LABEL(cputyp)), %l5; \ 65 ld [%l5 + %lo(_C_LABEL(cputyp))], %l5; \ 66 cmp %l5, CPU_SUN4M; \ 67 be 8f; \ 68 FD_SET_SWINTR_4C; \ 69 ba,a 9f; \ 70 8: \ 71 FD_SET_SWINTR_4M; \ 72 9: 73 #endif 74 75 ! flip TC bit in auxreg 76 ! assumes %l6 remains unchanged between ASSERT and DEASSERT 77 #define FD_ASSERT_TC_4C \ 78 sethi %hi(AUXREG_VA), %l6; \ 79 ldub [%l6 + %lo(AUXREG_VA) + 3], %l7; \ 80 or %l7, AUXIO4C_MB1|AUXIO4C_FTC, %l7; \ 81 stb %l7, [%l6 + %lo(AUXREG_VA) + 3]; 82 83 #define FD_DEASSERT_TC_4C \ 84 ldub [%l6 + %lo(AUXREG_VA) + 3], %l7; \ 85 andn %l7, AUXIO4C_FTC, %l7; \ 86 or %l7, AUXIO4C_MB1, %l7; \ 87 stb %l7, [%l6 + %lo(AUXREG_VA) + 3]; 88 89 ! flip TC bit in auxreg 90 #define FD_ASSERT_TC_4M \ 91 sethi %hi(AUXREG_VA), %l6; \ 92 ldub [%l6 + %lo(AUXREG_VA) + 3], %l7; \ 93 or %l7, AUXIO4M_MB1|AUXIO4M_FTC, %l7; \ 94 stb %l7, [%l6 + %lo(AUXREG_VA) + 3]; 95 96 #define FD_DEASSERT_TC_4M 97 98 /* 99 * flip TC bit in auxreg 100 * assumes %l5 remains unchanged between ASSERT and DEASSERT 101 */ 102 #if (defined(SUN4) || defined(SUN4C)) && !defined(SUN4M) 103 #define FD_ASSERT_TC FD_ASSERT_TC_4C 104 #define FD_DEASSERT_TC FD_DEASSERT_TC_4C 105 #elif !(defined(SUN4) || defined(SUN4C)) && defined(SUN4M) 106 #define FD_ASSERT_TC FD_ASSERT_TC_4M 107 #define FD_DEASSERT_TC FD_DEASSERT_TC_4M 108 #else 109 #define FD_ASSERT_TC \ 110 sethi %hi(_C_LABEL(cputyp)), %l5; \ 111 ld [%l5 + %lo(_C_LABEL(cputyp))], %l5; \ 112 cmp %l5, CPU_SUN4M; \ 113 be 8f; \ 114 nop; \ 115 FD_ASSERT_TC_4C; \ 116 ba,a 9f; \ 117 8: \ 118 FD_ASSERT_TC_4M; \ 119 9: 120 #define FD_DEASSERT_TC \ 121 cmp %l5, CPU_SUN4M; \ 122 be 8f; \ 123 nop; \ 124 FD_DEASSERT_TC_4C; \ 125 ba,a 9f; \ 126 8: \ 127 FD_DEASSERT_TC_4M; \ 128 9: 129 #endif 130 131 132 /* Timeout waiting for chip ready */ 133 #define POLL_TIMO 100000 134 135 /* 136 * register mnemonics. note overlapping assignments. 137 */ 138 #define R_fdc %l0 139 #define R_msr %l1 140 #define R_fifo %l2 141 #define R_buf %l3 142 #define R_tc %l4 143 #define R_stat %l3 144 #define R_nstat %l4 145 #define R_stcnt %l5 146 /* use %l6 and %l7 as short-term temporaries */ 147 148 149 .seg "data" 150 .align 8 151 /* A save haven for three precious registers */ 152 save_l: 153 .word 0 154 .word 0 155 .word 0 156 /* Pointer to a `struct fdcio', set in fd.c */ 157 .global _C_LABEL(fdciop) 158 _C_LABEL(fdciop): 159 .word 0 160 161 .seg "text" 162 .align 4 163 164 /* XXXSMP: kernel lock perimeter? */ 165 _ENTRY(_C_LABEL(fdchwintr)) 166 set save_l, %l7 167 std %l0, [%l7] 168 st %l2, [%l7 + 8] 169 170 ! tally interrupt (uvmexp.intrs++) 171 sethi %hi(_C_LABEL(uvmexp)+V_INTR), %l7 172 ld [%l7 + %lo(_C_LABEL(uvmexp)+V_INTR)], %l6 173 inc %l6 174 st %l6, [%l7 + %lo(_C_LABEL(uvmexp)+V_INTR)] 175 176 ! load fdc, if it's NULL there's nothing to do: schedule soft interrupt 177 sethi %hi(_C_LABEL(fdciop)), %l7 178 ld [%l7 + %lo(_C_LABEL(fdciop))], R_fdc 179 180 ! tally interrupt (fdcio_intrcnt.ev_count++) 181 ldd [R_fdc + FDC_EVCNT], %l6 182 addcc %l7, 1, %l7 183 addx %l6, 0, %l6 184 std %l6, [R_fdc + FDC_EVCNT] 185 186 /* 187 * load chips register addresses 188 * NOTE: we ignore the bus tag here and assume the bus handle 189 * is the virtual address of the chip's registers. 190 */ 191 ld [R_fdc + FDC_REG_HANDLE], %l7 ! get chip registers bus handle 192 ld [R_fdc + FDC_REG_MSR], R_msr ! get chip MSR reg addr 193 add R_msr, %l7, R_msr 194 ld [R_fdc + FDC_REG_FIFO], R_fifo ! get chip FIFO reg addr 195 add R_fifo, %l7, R_fifo 196 !!ld [R_fdc + FDC_REG_DOR], R_dor ! get chip DOR reg addr 197 !!add R_dor, %l7, R_dor 198 199 ! find out what we are supposed to do 200 ld [R_fdc + FDC_ITASK], %l7 ! get task from fdc 201 cmp %l7, FDC_ITASK_SENSEI 202 be sensei 203 !nop 204 cmp %l7, FDC_ITASK_RESULT 205 be resultphase 206 !nop 207 cmp %l7, FDC_ITASK_DMA 208 bne,a ssi ! a spurious interrupt 209 mov FDC_ISTATUS_SPURIOUS, %l7 ! set status and post sw intr 210 211 ! pseudo DMA 212 ld [R_fdc + FDC_TC], R_tc ! residual count 213 ld [R_fdc + FDC_DATA], R_buf ! IO buffer 214 215 ldub [R_msr], %l7 ! get MSR value 216 nextc: 217 btst NE7_RQM, %l7 ! room in fifo? 218 bnz,a 0f 219 btst NE7_NDM, %l7 ! overrun? 220 221 ! we filled/emptied the FIFO; update fdc->sc_buf & fdc->sc_tc 222 st R_tc, [R_fdc + FDC_TC] 223 b x 224 st R_buf, [R_fdc + FDC_DATA] 225 226 0: 227 bz resultphase ! overrun/underrun 228 btst NE7_DIO, %l7 ! IO direction 229 bz 1f 230 deccc R_tc 231 ldub [R_fifo], %l7 ! reading: 232 b 2f 233 stb %l7, [R_buf] ! *fdc->sc_bufp = *reg_fifo 234 235 1: 236 ldub [R_buf], %l7 ! writing: 237 stb %l7, [R_fifo] ! *reg_fifo = *fdc->sc_bufp 238 2: 239 inc R_buf ! fdc->sc_bufp++ 240 bne,a nextc ! if (--fdc->sc_tc) goto ... 241 ldub [R_msr], %l7 ! get MSR value 242 243 ! xfer done: update fdc->sc_buf & fdc->sc_tc, mark istate DONE 244 st R_tc, [R_fdc + FDC_TC] 245 st R_buf, [R_fdc + FDC_DATA] 246 247 ! flip TC bit in auxreg 248 FD_ASSERT_TC 249 250 ! we have some time to kill; anticipate on upcoming 251 ! result phase. 252 add R_fdc, FDC_STATUS, R_stat ! &fdc->sc_status[0] 253 mov -1, %l7 254 st %l7, [R_fdc + FDC_NSTAT] ! fdc->sc_nstat = -1; 255 256 FD_DEASSERT_TC 257 b,a resultphase1 258 259 260 sensei: 261 ldub [R_msr], %l7 262 set POLL_TIMO, %l6 263 1: deccc %l6 ! timeout? 264 be,a ssi ! if so, set status 265 mov FDC_ISTATUS_ERROR, %l7 ! and post sw interrupt 266 and %l7, (NE7_RQM | NE7_DIO | NE7_CB), %l7 267 cmp %l7, NE7_RQM 268 bne,a 1b ! loop till chip ready 269 ldub [R_msr], %l7 270 mov NE7CMD_SENSEI, %l7 271 stb %l7, [R_fifo] 272 273 resultphase: 274 ! prepare for result phase 275 add R_fdc, FDC_STATUS, R_stat ! &fdc->sc_status[0] 276 mov -1, %l7 277 st %l7, [R_fdc + FDC_NSTAT] ! fdc->sc_nstat = -1; 278 279 resultphase1: 280 clr R_stcnt 281 ldub [R_msr], %l7 282 set POLL_TIMO, %l6 283 1: deccc %l6 ! timeout? 284 be,a ssi ! if so, set status 285 mov FDC_ISTATUS_ERROR, %l7 ! and post sw interrupt 286 and %l7, (NE7_RQM | NE7_DIO | NE7_CB), %l7 287 cmp %l7, NE7_RQM 288 be 3f ! done 289 cmp %l7, (NE7_RQM | NE7_DIO | NE7_CB) 290 bne,a 1b ! loop till chip ready 291 ldub [R_msr], %l7 292 293 cmp R_stcnt, FDC_NSTATUS ! status overrun? 294 bge 2f ! if so, load but dont store 295 ldub [R_fifo], %l7 ! load the status byte 296 stb %l7, [R_stat] 297 inc R_stat 298 inc R_stcnt 299 2: b 1b 300 ldub [R_msr], %l7 301 302 3: 303 ! got status, update sc_nstat and mark istate DONE 304 st R_stcnt, [R_fdc + FDC_NSTAT] 305 mov FDC_ISTATUS_DONE, %l7 306 307 ssi: 308 ! set software interrupt 309 ! enter here with status in %l7 310 st %l7, [R_fdc + FDC_ISTATUS] 311 FD_SET_SWINTR 312 313 x: 314 /* 315 * Restore psr -- note: psr delay honored by pc restore loads. 316 */ 317 set save_l, %l7 318 ldd [%l7], %l0 319 mov %l0, %psr 320 nop 321 ld [%l7 + 8], %l2 322 jmp %l1 323 rett %l2 324 #endif 325
Indexes created Fri Sep 26 20:09:58 GMT 2025