xref: /netbsd/sys/arch/sun3/dev/si.c (revision 6550d01e)
1 /*	$NetBSD: si.c,v 1.63 2009/11/21 04:16:52 rmind Exp $	*/
2 
3 /*-
4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Adam Glass, David Jones, 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  * This file contains only the machine-dependent parts of the
34  * Sun3 SCSI driver.  (Autoconfig stuff and DMA functions.)
35  * The machine-independent parts are in ncr5380sbc.c
36  *
37  * Supported hardware includes:
38  * Sun SCSI-3 on OBIO (Sun3/50,Sun3/60)
39  * Sun SCSI-3 on VME (Sun3/160,Sun3/260)
40  *
41  * Could be made to support the Sun3/E if someone wanted to.
42  *
43  * Note:  Both supported variants of the Sun SCSI-3 adapter have
44  * some really unusual "features" for this driver to deal with,
45  * generally related to the DMA engine.  The OBIO variant will
46  * ignore any attempt to write the FIFO count register while the
47  * SCSI bus is in DATA_IN or DATA_OUT phase.  This is dealt with
48  * by setting the FIFO count early in COMMAND or MSG_IN phase.
49  *
50  * The VME variant has a bit to enable or disable the DMA engine,
51  * but that bit also gates the interrupt line from the NCR5380!
52  * Therefore, in order to get any interrupt from the 5380, (i.e.
53  * for reselect) one must clear the DMA engine transfer count and
54  * then enable DMA.  This has the further complication that you
55  * CAN NOT touch the NCR5380 while the DMA enable bit is set, so
56  * we have to turn DMA back off before we even look at the 5380.
57  *
58  * What wonderfully whacky hardware this is!
59  *
60  * Credits, history:
61  *
62  * David Jones wrote the initial version of this module, which
63  * included support for the VME adapter only. (no reselection).
64  *
65  * Gordon Ross added support for the OBIO adapter, and re-worked
66  * both the VME and OBIO code to support disconnect/reselect.
67  * (Required figuring out the hardware "features" noted above.)
68  *
69  * The autoconfiguration boilerplate came from Adam Glass.
70  */
71 
72 #include <sys/cdefs.h>
73 __KERNEL_RCSID(0, "$NetBSD: si.c,v 1.63 2009/11/21 04:16:52 rmind Exp $");
74 
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/errno.h>
78 #include <sys/kernel.h>
79 #include <sys/malloc.h>
80 #include <sys/device.h>
81 #include <sys/buf.h>
82 #include <sys/proc.h>
83 
84 #include <dev/scsipi/scsi_all.h>
85 #include <dev/scsipi/scsipi_all.h>
86 #include <dev/scsipi/scsipi_debug.h>
87 #include <dev/scsipi/scsiconf.h>
88 
89 #include <machine/autoconf.h>
90 #include <machine/bus.h>
91 #include <machine/dvma.h>
92 
93 /* #define DEBUG XXX */
94 
95 #include <dev/ic/ncr5380reg.h>
96 #include <dev/ic/ncr5380var.h>
97 
98 #include "sireg.h"
99 #include "sivar.h"
100 
101 /*
102  * Transfers smaller than this are done using PIO
103  * (on assumption they're not worth DMA overhead)
104  */
105 #define	MIN_DMA_LEN 128
106 
107 int si_debug = 0;
108 #ifdef	DEBUG
109 #endif
110 
111 /* How long to wait for DMA before declaring an error. */
112 int si_dma_intr_timo = 500;	/* ticks (sec. X 100) */
113 
114 static void	si_minphys(struct buf *);
115 
116 /*
117  * New-style autoconfig attachment. The cfattach
118  * structures are in si_obio.c and si_vme.c
119  */
120 
121 void
122 si_attach(struct si_softc *sc)
123 {
124 	struct ncr5380_softc *ncr_sc = &sc->ncr_sc;
125 	volatile struct si_regs *regs = sc->sc_regs;
126 	int i;
127 
128 	/*
129 	 * Support the "options" (config file flags).
130 	 * Disconnect/reselect is a per-target mask.
131 	 * Interrupts and DMA are per-controller.
132 	 */
133 	ncr_sc->sc_no_disconnect =
134 	    (sc->sc_options & SI_NO_DISCONNECT);
135 	ncr_sc->sc_parity_disable =
136 	    (sc->sc_options & SI_NO_PARITY_CHK) >> 8;
137 	if (sc->sc_options & SI_FORCE_POLLING)
138 		ncr_sc->sc_flags |= NCR5380_FORCE_POLLING;
139 
140 #if 1	/* XXX - Temporary */
141 	/* XXX - In case we think DMA is completely broken... */
142 	if (sc->sc_options & SI_DISABLE_DMA) {
143 		/* Override this function pointer. */
144 		ncr_sc->sc_dma_alloc = NULL;
145 	}
146 #endif
147 	ncr_sc->sc_min_dma_len = MIN_DMA_LEN;
148 
149 	/*
150 	 * Initialize fields used by the MI code
151 	 */
152 	ncr_sc->sci_r0 = &regs->sci.sci_r0;
153 	ncr_sc->sci_r1 = &regs->sci.sci_r1;
154 	ncr_sc->sci_r2 = &regs->sci.sci_r2;
155 	ncr_sc->sci_r3 = &regs->sci.sci_r3;
156 	ncr_sc->sci_r4 = &regs->sci.sci_r4;
157 	ncr_sc->sci_r5 = &regs->sci.sci_r5;
158 	ncr_sc->sci_r6 = &regs->sci.sci_r6;
159 	ncr_sc->sci_r7 = &regs->sci.sci_r7;
160 
161 	ncr_sc->sc_rev = NCR_VARIANT_NCR5380;
162 
163 	/*
164 	 * Allocate DMA handles.
165 	 */
166 	i = SCI_OPENINGS * sizeof(struct si_dma_handle);
167 	sc->sc_dma = (struct si_dma_handle *)
168 		malloc(i, M_DEVBUF, M_WAITOK);
169 	if (sc->sc_dma == NULL)
170 		panic("si: dvma_malloc failed");
171 	for (i = 0; i < SCI_OPENINGS; i++)
172 		sc->sc_dma[i].dh_flags = 0;
173 
174 	ncr_sc->sc_channel.chan_id = 7;
175 	ncr_sc->sc_adapter.adapt_minphys = si_minphys;
176 
177 	/*
178 	 *  Initialize si board itself.
179 	 */
180 	ncr5380_attach(ncr_sc);
181 }
182 
183 static void
184 si_minphys(struct buf *bp)
185 {
186 
187 	if (bp->b_bcount > MAX_DMA_LEN) {
188 #ifdef	DEBUG
189 		if (si_debug) {
190 			printf("%s len = 0x%x.\n", __func__, bp->b_bcount);
191 			Debugger();
192 		}
193 #endif
194 		bp->b_bcount = MAX_DMA_LEN;
195 	}
196 	minphys(bp);
197 }
198 
199 
200 #define CSR_WANT (SI_CSR_SBC_IP | SI_CSR_DMA_IP | \
201 	SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR )
202 
203 int
204 si_intr(void *arg)
205 {
206 	struct si_softc *sc = arg;
207 	volatile struct si_regs *si = sc->sc_regs;
208 	int dma_error, claimed;
209 	u_short csr;
210 
211 	claimed = 0;
212 	dma_error = 0;
213 
214 	/* SBC interrupt? DMA interrupt? */
215 	csr = si->si_csr;
216 	NCR_TRACE("si_intr: csr=0x%x\n", csr);
217 
218 	if (csr & SI_CSR_DMA_CONFLICT) {
219 		dma_error |= SI_CSR_DMA_CONFLICT;
220 		printf("%s: DMA conflict\n", __func__);
221 	}
222 	if (csr & SI_CSR_DMA_BUS_ERR) {
223 		dma_error |= SI_CSR_DMA_BUS_ERR;
224 		printf("%s: DMA bus error\n", __func__);
225 	}
226 	if (dma_error) {
227 		if (sc->ncr_sc.sc_state & NCR_DOINGDMA)
228 			sc->ncr_sc.sc_state |= NCR_ABORTING;
229 		/* Make sure we will call the main isr. */
230 		csr |= SI_CSR_DMA_IP;
231 	}
232 
233 	if (csr & (SI_CSR_SBC_IP | SI_CSR_DMA_IP)) {
234 		claimed = ncr5380_intr(&sc->ncr_sc);
235 #ifdef	DEBUG
236 		if (!claimed) {
237 			printf("%s: spurious from SBC\n", __func__);
238 			if (si_debug & 4)
239 				Debugger();	/* XXX */
240 		}
241 #endif
242 		/* Yes, we DID cause this interrupt. */
243 		claimed = 1;
244 	}
245 
246 	return claimed;
247 }
248 
249 
250 /*****************************************************************
251  * Common functions for DMA
252  ****************************************************************/
253 
254 /*
255  * Allocate a DMA handle and put it in sc->sc_dma.  Prepare
256  * for DMA transfer.  On the Sun3, this means mapping the buffer
257  * into DVMA space.  dvma_mapin() flushes the cache for us.
258  */
259 void
260 si_dma_alloc(struct ncr5380_softc *ncr_sc)
261 {
262 	struct si_softc *sc = (struct si_softc *)ncr_sc;
263 	struct sci_req *sr = ncr_sc->sc_current;
264 	struct scsipi_xfer *xs = sr->sr_xs;
265 	struct si_dma_handle *dh;
266 	int i, xlen;
267 	void *addr;
268 
269 #ifdef	DIAGNOSTIC
270 	if (sr->sr_dma_hand != NULL)
271 		panic("%s: already have DMA handle", __func__);
272 #endif
273 
274 	addr = ncr_sc->sc_dataptr;
275 	xlen = ncr_sc->sc_datalen;
276 
277 	/* If the DMA start addr is misaligned then do PIO */
278 	if (((vaddr_t)addr & 1) || (xlen & 1)) {
279 		printf("%s: misaligned.\n", __func__);
280 		return;
281 	}
282 
283 	/* Make sure our caller checked sc_min_dma_len. */
284 	if (xlen < MIN_DMA_LEN)
285 		panic("%s: xlen=0x%x", __func__, xlen);
286 
287 	/*
288 	 * Never attempt single transfers of more than 63k, because
289 	 * our count register may be only 16 bits (an OBIO adapter).
290 	 * This should never happen since already bounded by minphys().
291 	 * XXX - Should just segment these...
292 	 */
293 	if (xlen > MAX_DMA_LEN) {
294 		printf("%s: excessive xlen=0x%x\n", __func__, xlen);
295 		Debugger();
296 		ncr_sc->sc_datalen = xlen = MAX_DMA_LEN;
297 	}
298 
299 	/* Find free DMA handle.  Guaranteed to find one since we have
300 	   as many DMA handles as the driver has processes. */
301 	for (i = 0; i < SCI_OPENINGS; i++) {
302 		if ((sc->sc_dma[i].dh_flags & SIDH_BUSY) == 0)
303 			goto found;
304 	}
305 	panic("si: no free DMA handles.");
306 found:
307 
308 	dh = &sc->sc_dma[i];
309 	dh->dh_flags = SIDH_BUSY;
310 
311 	if (bus_dmamap_load(sc->sc_dmat, sc->sc_dmap, addr, xlen, NULL,
312 	    BUS_DMA_NOWAIT) != 0)
313 		panic("%s: can't load dmamap", device_xname(ncr_sc->sc_dev));
314 	dh->dh_dmaaddr = sc->sc_dmap->dm_segs[0].ds_addr;
315 	dh->dh_dmalen  = xlen;
316 
317 	/* Copy the "write" flag for convenience. */
318 	if (xs->xs_control & XS_CTL_DATA_OUT)
319 		dh->dh_flags |= SIDH_OUT;
320 
321 	bus_dmamap_sync(sc->sc_dmat, sc->sc_dmap, 0, dh->dh_dmalen,
322 	    (dh->dh_flags & SIDH_OUT) == 0 ?
323 	    BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
324 
325 #if 0
326 	/*
327 	 * Some machines might not need to remap B_PHYS buffers.
328 	 * The sun3 does not map B_PHYS buffers into DVMA space,
329 	 * (they are mapped into normal KV space) so on the sun3
330 	 * we must always remap to a DVMA address here. Re-map is
331 	 * cheap anyway, because it's done by segments, not pages.
332 	 */
333 	if (xs->bp && (xs->bp->b_flags & B_PHYS))
334 		dh->dh_flags |= SIDH_PHYS;
335 #endif
336 
337 	/* success */
338 	sr->sr_dma_hand = dh;
339 
340 	return;
341 }
342 
343 
344 void
345 si_dma_free(struct ncr5380_softc *ncr_sc)
346 {
347 	struct si_softc *sc = (struct si_softc *)ncr_sc;
348 	struct sci_req *sr = ncr_sc->sc_current;
349 	struct si_dma_handle *dh = sr->sr_dma_hand;
350 
351 #ifdef	DIAGNOSTIC
352 	if (dh == NULL)
353 		panic("%s: no DMA handle", __func__);
354 #endif
355 
356 	if (ncr_sc->sc_state & NCR_DOINGDMA)
357 		panic("%s: free while in progress", __func__);
358 
359 	if (dh->dh_flags & SIDH_BUSY) {
360 		bus_dmamap_sync(sc->sc_dmat, sc->sc_dmap, 0, dh->dh_dmalen,
361 		    (dh->dh_flags & SIDH_OUT) == 0 ?
362 		    BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
363 		bus_dmamap_unload(sc->sc_dmat, sc->sc_dmap);
364 		dh->dh_dmaaddr = 0;
365 		dh->dh_flags = 0;
366 	}
367 	sr->sr_dma_hand = NULL;
368 }
369 
370 
371 #define	CSR_MASK (SI_CSR_SBC_IP | SI_CSR_DMA_IP | \
372 		SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR)
373 #define	POLL_TIMO	50000	/* X100 = 5 sec. */
374 
375 /*
376  * Poll (spin-wait) for DMA completion.
377  * Called right after xx_dma_start(), and
378  * xx_dma_stop() will be called next.
379  * Same for either VME or OBIO.
380  */
381 void
382 si_dma_poll(struct ncr5380_softc *ncr_sc)
383 {
384 	struct si_softc *sc = (struct si_softc *)ncr_sc;
385 	struct sci_req *sr = ncr_sc->sc_current;
386 	volatile struct si_regs *si = sc->sc_regs;
387 	int tmo;
388 
389 	/* Make sure DMA started successfully. */
390 	if (ncr_sc->sc_state & NCR_ABORTING)
391 		return;
392 
393 	/*
394 	 * XXX: The Sun driver waits for ~SI_CSR_DMA_ACTIVE here
395 	 * XXX: (on obio) or even worse (on vme) a 10mS. delay!
396 	 * XXX: I really doubt that is necessary...
397 	 */
398 
399 	/* Wait for any "DMA complete" or error bits. */
400 	tmo = POLL_TIMO;
401 	for (;;) {
402 		if (si->si_csr & CSR_MASK)
403 			break;
404 		if (--tmo <= 0) {
405 			printf("si: DMA timeout (while polling)\n");
406 			/* Indicate timeout as MI code would. */
407 			sr->sr_flags |= SR_OVERDUE;
408 			break;
409 		}
410 		delay(100);
411 	}
412 	NCR_TRACE("si_dma_poll: waited %d\n",
413 			  POLL_TIMO - tmo);
414 
415 #ifdef	DEBUG
416 	if (si_debug & 2) {
417 		printf("%s: done, csr=0x%x\n", __func__, si->si_csr);
418 	}
419 #endif
420 }
421