spc.c revision 1.7 
1/* $NetBSD: spc.c,v 1.7 2008/05/14 13:29:28 tsutsui Exp $ */
2
3/*-
4 * Copyright (c) 2003 Izumi Tsutsui.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "opt_ddb.h"
28
29#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
30
31__KERNEL_RCSID(0, "$NetBSD: spc.c,v 1.7 2008/05/14 13:29:28 tsutsui Exp $");
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/device.h>
36
37#include <machine/autoconf.h>
38#include <machine/bus.h>
39#include <machine/cpu.h>
40#include <machine/intr.h>
41
42#include <hp300/dev/dioreg.h>
43#include <hp300/dev/diovar.h>
44#include <hp300/dev/diodevs.h>
45
46#include <dev/scsipi/scsi_all.h>
47#include <dev/scsipi/scsipi_all.h>
48#include <dev/scsipi/scsi_message.h>
49#include <dev/scsipi/scsiconf.h>
50
51#include <dev/ic/mb89352reg.h>
52#include <dev/ic/mb89352var.h>
53
54#include <hp300/dev/hp98265reg.h>
55#include <hp300/dev/dmareg.h>
56#include <hp300/dev/dmavar.h>
57
58static int	spc_dio_match(device_t, cfdata_t, void *);
59static void	spc_dio_attach(device_t, device_t, void *);
60static void	spc_dio_dmastart(struct spc_softc *, void *, size_t, int);
61static void	spc_dio_dmadone(struct spc_softc *);
62static void	spc_dio_dmago(void *);
63static void	spc_dio_dmastop(void *);
64
65struct spc_dio_softc {
66	struct spc_softc sc_spc;	/* MI spc softc */
67
68	/* DIO specific goo. */
69	struct bus_space_tag sc_tag;	/* bus space tag with oddbyte func */
70	bus_space_handle_t sc_iohsc;	/* bus space handle for HPSCSI */
71	struct dmaqueue sc_dq;		/* DMA job queue */
72	u_int sc_dflags;		/* DMA flags */
73#define SCSI_DMA32	0x01		/* 32-bit DMA should be used */
74#define SCSI_HAVEDMA	0x02		/* controller has DMA channel */
75#define SCSI_DATAIN	0x04		/* DMA direction */
76};
77
78CFATTACH_DECL_NEW(spc, sizeof(struct spc_dio_softc),
79    spc_dio_match, spc_dio_attach, NULL, NULL);
80
81static int
82spc_dio_match(device_t parent, cfdata_t cf, void *aux)
83{
84	struct dio_attach_args *da = aux;
85
86	switch (da->da_id) {
87	case DIO_DEVICE_ID_SCSI0:
88	case DIO_DEVICE_ID_SCSI1:
89	case DIO_DEVICE_ID_SCSI2:
90	case DIO_DEVICE_ID_SCSI3:
91		return 1;
92	}
93
94	return 0;
95}
96
97static void
98spc_dio_attach(device_t parent, device_t self, void *aux)
99{
100	struct spc_dio_softc *dsc = device_private(self);
101	struct spc_softc *sc = &dsc->sc_spc;
102	struct dio_attach_args *da = aux;
103	bus_space_tag_t iot = &dsc->sc_tag;
104	bus_space_handle_t iohsc, iohspc;
105	uint8_t id;
106
107	sc->sc_dev = self;
108	memcpy(iot, da->da_bst, sizeof(struct bus_space_tag));
109	dio_set_bus_space_oddbyte(iot);
110
111	if (bus_space_map(iot, da->da_addr, da->da_size, 0, &iohsc)) {
112		aprint_error(": can't map SCSI registers\n");
113		return;
114	}
115
116	if (bus_space_subregion(iot, iohsc, SPC_OFFSET, SPC_SIZE, &iohspc)) {
117		aprint_error(": can't map SPC registers\n");
118		return;
119	}
120
121	aprint_normal(": 98265A SCSI");
122
123	bus_space_write_1(iot, iohsc, HPSCSI_ID, 0xff);
124	DELAY(100);
125	id = bus_space_read_1(iot, iohsc, HPSCSI_ID);
126	if ((id & ID_WORD_DMA) == 0) {
127		aprint_normal(", 32-bit DMA");
128		dsc->sc_dflags |= SCSI_DMA32;
129	}
130	id &= ID_MASK;
131	aprint_normal(", SCSI ID %d\n", id);
132
133	sc->sc_iot = iot;
134	sc->sc_ioh = iohspc;
135	sc->sc_initiator = id;
136
137	sc->sc_dma_start = spc_dio_dmastart;
138	sc->sc_dma_done  = spc_dio_dmadone;
139
140	dsc->sc_iohsc = iohsc;
141	dsc->sc_dq.dq_softc = dsc;
142	dsc->sc_dq.dq_start = spc_dio_dmago;
143	dsc->sc_dq.dq_done  = spc_dio_dmastop;
144
145	bus_space_write_1(iot, iohsc, HPSCSI_CSR, 0x00);
146	bus_space_write_1(iot, iohsc, HPSCSI_HCONF, 0x00);
147
148	dio_intr_establish(spc_intr, (void *)sc, da->da_ipl, IPL_BIO);
149
150	spc_attach(sc);
151
152	/* Enable SPC interrupts. */
153	bus_space_write_1(iot, iohsc, HPSCSI_CSR, CSR_IE);
154}
155
156static void
157spc_dio_dmastart(struct spc_softc *sc, void *addr, size_t size, int datain)
158{
159	struct spc_dio_softc *dsc = (struct spc_dio_softc *)sc;
160
161	dsc->sc_dq.dq_chan = DMA0 | DMA1;
162	dsc->sc_dflags |= SCSI_HAVEDMA;
163	if (datain)
164		dsc->sc_dflags |= SCSI_DATAIN;
165	else
166		dsc->sc_dflags &= ~SCSI_DATAIN;
167
168	if (dmareq(&dsc->sc_dq) != 0)
169		/* DMA channel is available, so start DMA immediately */
170		spc_dio_dmago(dsc);
171	/* else dma start function will be called later from dmafree(). */
172}
173
174static void
175spc_dio_dmago(void *arg)
176{
177	struct spc_dio_softc *dsc = arg;
178	struct spc_softc *sc = &dsc->sc_spc;
179	bus_space_tag_t iot;
180	bus_space_handle_t iohsc, iohspc;
181	int len, chan;
182	uint32_t dmaflags;
183	uint8_t cmd;
184
185	iot = sc->sc_iot;
186	iohspc = sc->sc_ioh;
187	iohsc = dsc->sc_iohsc;
188
189	bus_space_write_1(iot, iohsc, HPSCSI_HCONF, 0);
190
191	cmd = CSR_IE;
192	dmaflags = DMAGO_NOINT;
193	chan = dsc->sc_dq.dq_chan;
194	if ((dsc->sc_dflags & SCSI_DATAIN) != 0) {
195		cmd |= CSR_DMAIN;
196		dmaflags |= DMAGO_READ;
197	}
198	if ((dsc->sc_dflags & SCSI_DMA32) != 0 &&
199	    ((u_int)sc->sc_dp & 3) == 0 &&
200	    (sc->sc_dleft & 3) == 0) {
201		cmd |= CSR_DMA32;
202		dmaflags |= DMAGO_LWORD;
203	} else
204		dmaflags |= DMAGO_WORD;
205
206	dmago(chan, sc->sc_dp, sc->sc_dleft, dmaflags);
207
208	bus_space_write_1(iot, iohsc, HPSCSI_CSR, cmd);
209	cmd |= (chan == 0) ? CSR_DE0 : CSR_DE1;
210	bus_space_write_1(iot, iohsc, HPSCSI_CSR, cmd);
211
212	cmd = SCMD_XFR;
213	len = sc->sc_dleft;
214
215	if ((len & (DEV_BSIZE - 1)) != 0) /* XXX ??? */ {
216		cmd |= SCMD_PAD;
217#if 0
218		if ((dsc->sc_dflags & SCSI_DATAIN) != 0)
219			len += 2; /* XXX ??? */
220#endif
221	}
222
223	bus_space_write_1(iot, iohspc, TCH, len >> 16);
224	bus_space_write_1(iot, iohspc, TCM, len >>  8);
225	bus_space_write_1(iot, iohspc, TCL, len);
226	bus_space_write_1(iot, iohspc, PCTL, sc->sc_phase | PCTL_BFINT_ENAB);
227	bus_space_write_1(iot, iohspc, SCMD, cmd);
228
229	sc->sc_flags |= SPC_DOINGDMA;
230}
231
232static void
233spc_dio_dmadone(struct spc_softc *sc)
234{
235	struct spc_dio_softc *dsc = (struct spc_dio_softc *)sc;
236	bus_space_tag_t iot;
237	bus_space_handle_t ioh, iohsc;
238	int resid, trans;
239	uint8_t cmd;
240
241	iot = sc->sc_iot;
242	ioh = sc->sc_ioh;
243	iohsc = dsc->sc_iohsc;
244
245	/* wait DMA complete */
246	if ((bus_space_read_1(iot, ioh, SSTS) & SSTS_BUSY) != 0) {
247		int timeout = 1000; /* XXX how long? */
248		while ((bus_space_read_1(iot, ioh, SSTS) & SSTS_BUSY) != 0) {
249			if (--timeout < 0)
250				printf("%s: DMA complete timeout\n",
251				    device_xname(sc->sc_dev));
252			DELAY(1);
253		}
254	}
255
256	if ((dsc->sc_dflags & SCSI_HAVEDMA) != 0) {
257		dmafree(&dsc->sc_dq);
258		dsc->sc_dflags &= ~SCSI_HAVEDMA;
259	}
260
261	cmd = bus_space_read_1(iot, iohsc, HPSCSI_CSR);
262	cmd &= ~(CSR_DE1|CSR_DE0);
263	bus_space_write_1(iot, iohsc, HPSCSI_CSR, cmd);
264
265	resid = bus_space_read_1(iot, ioh, TCH) << 16 |
266	    bus_space_read_1(iot, ioh, TCM) << 8 |
267	    bus_space_read_1(iot, ioh, TCL);
268	trans = sc->sc_dleft - resid;
269	sc->sc_dp += trans;
270	sc->sc_dleft -= trans;
271
272	sc->sc_flags &= ~SPC_DOINGDMA;
273}
274
275static void
276spc_dio_dmastop(void *arg)
277{
278	struct spc_dio_softc *dsc = arg;
279	struct spc_softc *sc = &dsc->sc_spc;
280	uint8_t cmd;
281
282	/* XXX When is this function called? */
283	cmd = bus_space_read_1(sc->sc_iot, dsc->sc_iohsc, HPSCSI_CSR);
284	cmd &= ~(CSR_DE1|CSR_DE0);
285	bus_space_write_1(sc->sc_iot, dsc->sc_iohsc, HPSCSI_CSR, cmd);
286
287	dsc->sc_dflags &= ~SCSI_HAVEDMA;
288	sc->sc_flags &= ~SPC_DOINGDMA;
289}
290