esp.c revision 1.30
1 /* $NetBSD: esp.c,v 1.30 2024/12/20 23:52:00 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jeremy Cooper and Gordon W. Ross 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * "Front end" glue for the ncr53c9x chip, formerly known as the 34 * Emulex SCSI Processor (ESP) which is what we actually have. 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: esp.c,v 1.30 2024/12/20 23:52:00 tsutsui Exp $"); 39 40 #include <sys/types.h> 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/errno.h> 45 #include <sys/device.h> 46 #include <sys/buf.h> 47 48 #include <dev/scsipi/scsi_all.h> 49 #include <dev/scsipi/scsipi_all.h> 50 #include <dev/scsipi/scsiconf.h> 51 #include <dev/scsipi/scsi_message.h> 52 53 #include <machine/autoconf.h> 54 #include <machine/bus.h> 55 56 #include <dev/ic/ncr53c9xreg.h> 57 #include <dev/ic/ncr53c9xvar.h> 58 59 #include <sun3/dev/dmareg.h> 60 #include <sun3/dev/dmavar.h> 61 62 #define ESP_REG_SIZE (12*4) 63 64 struct esp_softc { 65 struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */ 66 bus_space_tag_t sc_bst; /* bus space tag */ 67 bus_space_handle_t sc_bsh; /* bus space handle */ 68 struct dma_softc *sc_dma; /* pointer to my dma */ 69 }; 70 71 static int espmatch(device_t, cfdata_t, void *); 72 static void espattach(device_t, device_t, void *); 73 74 CFATTACH_DECL_NEW(esp, sizeof(struct esp_softc), 75 espmatch, espattach, NULL, NULL); 76 77 /* 78 * Functions and the switch for the MI code. 79 */ 80 static uint8_t esp_read_reg(struct ncr53c9x_softc *, int); 81 static void esp_write_reg(struct ncr53c9x_softc *, int, uint8_t); 82 static int esp_dma_isintr(struct ncr53c9x_softc *); 83 static void esp_dma_reset(struct ncr53c9x_softc *); 84 static int esp_dma_intr(struct ncr53c9x_softc *); 85 static int esp_dma_setup(struct ncr53c9x_softc *, uint8_t **, size_t *, 86 int, size_t *); 87 static void esp_dma_go(struct ncr53c9x_softc *); 88 static void esp_dma_stop(struct ncr53c9x_softc *); 89 static int esp_dma_isactive(struct ncr53c9x_softc *); 90 91 static struct ncr53c9x_glue esp_glue = { 92 esp_read_reg, 93 esp_write_reg, 94 esp_dma_isintr, 95 esp_dma_reset, 96 esp_dma_intr, 97 esp_dma_setup, 98 esp_dma_go, 99 esp_dma_stop, 100 esp_dma_isactive, 101 NULL, /* gl_clear_latched_intr */ 102 }; 103 104 static int 105 espmatch(device_t parent, struct cfdata *cf, void *aux) 106 { 107 struct confargs *ca = aux; 108 109 /* 110 * Check for the esp registers. 111 */ 112 if (bus_peek(ca->ca_bustype, 113 ca->ca_paddr + (NCR_STAT * 4), 1) == -1) 114 return 0; 115 116 /* If default ipl, fill it in. */ 117 if (ca->ca_intpri == -1) 118 ca->ca_intpri = 2; 119 120 return 1; 121 } 122 123 static void 124 espattach(device_t parent, device_t self, void *aux) 125 { 126 struct esp_softc *esc = device_private(self); 127 struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x; 128 struct confargs *ca = aux; 129 130 /* 131 * Set up glue for MI code early; we use some of it here. 132 */ 133 sc->sc_dev = self; 134 sc->sc_glue = &esp_glue; 135 136 /* 137 * Map the ESP registers. 138 */ 139 esc->sc_bst = ca->ca_bustag; 140 if (bus_space_map(esc->sc_bst, ca->ca_paddr, ESP_REG_SIZE, 0, 141 &esc->sc_bsh) != 0) { 142 aprint_error(": can't map register\n"); 143 return; 144 } 145 146 /* Other settings */ 147 sc->sc_id = 7; 148 sc->sc_freq = 20; /* The 3/80 esp runs at 20 MHz */ 149 150 /* 151 * Hook up the DMA driver. 152 */ 153 esc->sc_dma = espdmafind(device_unit(self)); 154 esc->sc_dma->sc_client = sc; /* Point back to us */ 155 156 /* 157 * XXX More of this should be in ncr53c9x_attach(), but 158 * XXX should we really poke around the chip that much in 159 * XXX the MI code? Think about this more... 160 */ 161 162 /* 163 * It is necessary to try to load the 2nd config register here, 164 * to find out what rev the esp chip is, else the ncr53c9x_reset 165 * will not set up the defaults correctly. 166 */ 167 sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB; 168 sc->sc_cfg2 = NCRCFG2_SCSI2 | NCRCFG2_RPE; 169 sc->sc_cfg3 = NCRCFG3_CDB; 170 NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2); 171 172 if ((NCR_READ_REG(sc, NCR_CFG2) & ~NCRCFG2_RSVD) != 173 (NCRCFG2_SCSI2 | NCRCFG2_RPE)) { 174 sc->sc_rev = NCR_VARIANT_ESP100; 175 } else { 176 sc->sc_cfg2 = NCRCFG2_SCSI2; 177 NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2); 178 sc->sc_cfg3 = 0; 179 NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); 180 sc->sc_cfg3 = (NCRCFG3_CDB | NCRCFG3_FCLK); 181 NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); 182 if (NCR_READ_REG(sc, NCR_CFG3) != 183 (NCRCFG3_CDB | NCRCFG3_FCLK)) { 184 sc->sc_rev = NCR_VARIANT_ESP100A; 185 } else { 186 /* NCRCFG2_FE enables > 64K transfers */ 187 sc->sc_cfg2 |= NCRCFG2_FE; 188 sc->sc_cfg3 = 0; 189 NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); 190 sc->sc_rev = NCR_VARIANT_ESP200; 191 } 192 } 193 194 /* 195 * XXX minsync and maxxfer _should_ be set up in MI code, 196 * XXX but it appears to have some dependency on what sort 197 * XXX of DMA we're hooked up to, etc. 198 */ 199 200 /* 201 * This is the value used to start sync negotiations 202 * Note that the NCR register "SYNCTP" is programmed 203 * in "clocks per byte", and has a minimum value of 4. 204 * The SCSI period used in negotiation is one-fourth 205 * of the time (in nanoseconds) needed to transfer one byte. 206 * Since the chip's clock is given in MHz, we have the following 207 * formula: 4 * period = (1000 / freq) * 4 208 */ 209 sc->sc_minsync = 1000 / sc->sc_freq; 210 211 /* 212 * Alas, we must now modify the value a bit, because it's 213 * only valid when can switch on FASTCLK and FASTSCSI bits 214 * in config register 3... 215 */ 216 switch (sc->sc_rev) { 217 case NCR_VARIANT_ESP100: 218 sc->sc_maxxfer = 64 * 1024; 219 sc->sc_minsync = 0; /* No synch on old chip? */ 220 break; 221 222 case NCR_VARIANT_ESP100A: 223 sc->sc_maxxfer = 64 * 1024; 224 /* Min clocks/byte is 5 */ 225 sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5); 226 break; 227 228 case NCR_VARIANT_ESP200: 229 sc->sc_maxxfer = 16 * 1024 * 1024; 230 /* XXX - do actually set FAST* bits */ 231 break; 232 } 233 234 /* and the interrupts */ 235 isr_add_autovect(ncr53c9x_intr, sc, ca->ca_intpri); 236 evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, NULL, 237 device_xname(self), "intr"); 238 239 /* Do the common parts of attachment. */ 240 sc->sc_adapter.adapt_minphys = minphys; 241 sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request; 242 ncr53c9x_attach(sc); 243 244 /* Turn on target selection using the `dma' method */ 245 sc->sc_features |= NCR_F_DMASELECT; 246 } 247 248 249 /* 250 * Glue functions. 251 */ 252 253 uint8_t 254 esp_read_reg(struct ncr53c9x_softc *sc, int reg) 255 { 256 struct esp_softc *esc = (struct esp_softc *)sc; 257 258 return bus_space_read_1(esc->sc_bst, esc->sc_bsh, reg * 4); 259 } 260 261 void 262 esp_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t val) 263 { 264 struct esp_softc *esc = (struct esp_softc *)sc; 265 266 bus_space_write_1(esc->sc_bst, esc->sc_bsh, reg * 4, val); 267 } 268 269 int 270 esp_dma_isintr(struct ncr53c9x_softc *sc) 271 { 272 struct esp_softc *esc = (struct esp_softc *)sc; 273 274 return DMA_ISINTR(esc->sc_dma); 275 } 276 277 void 278 esp_dma_reset(struct ncr53c9x_softc *sc) 279 { 280 struct esp_softc *esc = (struct esp_softc *)sc; 281 282 dma_reset(esc->sc_dma); 283 } 284 285 int 286 esp_dma_intr(struct ncr53c9x_softc *sc) 287 { 288 struct esp_softc *esc = (struct esp_softc *)sc; 289 290 return espdmaintr(esc->sc_dma); 291 } 292 293 int 294 esp_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len, 295 int datain, size_t *dmasize) 296 { 297 struct esp_softc *esc = (struct esp_softc *)sc; 298 299 return dma_setup(esc->sc_dma, addr, len, datain, dmasize); 300 } 301 302 void 303 esp_dma_go(struct ncr53c9x_softc *sc) 304 { 305 struct esp_softc *esc = (struct esp_softc *)sc; 306 307 DMA_GO(esc->sc_dma); 308 } 309 310 void 311 esp_dma_stop(struct ncr53c9x_softc *sc) 312 { 313 struct esp_softc *esc = (struct esp_softc *)sc; 314 315 DMA_STOP(esc->sc_dma); 316 } 317 318 int 319 esp_dma_isactive(struct ncr53c9x_softc *sc) 320 { 321 struct esp_softc *esc = (struct esp_softc *)sc; 322 323 return DMA_ISACTIVE(esc->sc_dma); 324 } 325
Indexes created Tue Sep 30 17:09:57 GMT 2025