spc.c revision 1.6 
1/* $NetBSD: spc.c,v 1.6 2008/03/31 15:20:47 tsutsui Exp $ */
2
3/*
4 * Copyright (c) 2003 Izumi Tsutsui.
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. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "opt_ddb.h"
31
32#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
33
34__KERNEL_RCSID(0, "$NetBSD: spc.c,v 1.6 2008/03/31 15:20:47 tsutsui Exp $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/device.h>
39
40#include <machine/autoconf.h>
41#include <machine/bus.h>
42#include <machine/cpu.h>
43#include <machine/intr.h>
44
45#include <hp300/dev/dioreg.h>
46#include <hp300/dev/diovar.h>
47#include <hp300/dev/diodevs.h>
48
49#include <dev/scsipi/scsi_all.h>
50#include <dev/scsipi/scsipi_all.h>
51#include <dev/scsipi/scsi_message.h>
52#include <dev/scsipi/scsiconf.h>
53
54#include <dev/ic/mb89352reg.h>
55#include <dev/ic/mb89352var.h>
56
57#include <hp300/dev/hp98265reg.h>
58#include <hp300/dev/dmareg.h>
59#include <hp300/dev/dmavar.h>
60
61static int	spc_dio_match(device_t, cfdata_t, void *);
62static void	spc_dio_attach(device_t, device_t, void *);
63static void	spc_dio_dmastart(struct spc_softc *, void *, size_t, int);
64static void	spc_dio_dmadone(struct spc_softc *);
65static void	spc_dio_dmago(void *);
66static void	spc_dio_dmastop(void *);
67
68struct spc_dio_softc {
69	struct spc_softc sc_spc;	/* MI spc softc */
70
71	/* DIO specific goo. */
72	struct bus_space_tag sc_tag;	/* bus space tag with oddbyte func */
73	bus_space_handle_t sc_iohsc;	/* bus space handle for HPSCSI */
74	struct dmaqueue sc_dq;		/* DMA job queue */
75	u_int sc_dflags;		/* DMA flags */
76#define SCSI_DMA32	0x01		/* 32-bit DMA should be used */
77#define SCSI_HAVEDMA	0x02		/* controller has DMA channel */
78#define SCSI_DATAIN	0x04		/* DMA direction */
79};
80
81CFATTACH_DECL_NEW(spc, sizeof(struct spc_dio_softc),
82    spc_dio_match, spc_dio_attach, NULL, NULL);
83
84static int
85spc_dio_match(device_t parent, cfdata_t cf, void *aux)
86{
87	struct dio_attach_args *da = aux;
88
89	switch (da->da_id) {
90	case DIO_DEVICE_ID_SCSI0:
91	case DIO_DEVICE_ID_SCSI1:
92	case DIO_DEVICE_ID_SCSI2:
93	case DIO_DEVICE_ID_SCSI3:
94		return 1;
95	}
96
97	return 0;
98}
99
100static void
101spc_dio_attach(device_t parent, device_t self, void *aux)
102{
103	struct spc_dio_softc *dsc = device_private(self);
104	struct spc_softc *sc = &dsc->sc_spc;
105	struct dio_attach_args *da = aux;
106	bus_space_tag_t iot = &dsc->sc_tag;
107	bus_space_handle_t iohsc, iohspc;
108	uint8_t id;
109
110	sc->sc_dev = self;
111	memcpy(iot, da->da_bst, sizeof(struct bus_space_tag));
112	dio_set_bus_space_oddbyte(iot);
113
114	if (bus_space_map(iot, da->da_addr, da->da_size, 0, &iohsc)) {
115		aprint_error(": can't map SCSI registers\n");
116		return;
117	}
118
119	if (bus_space_subregion(iot, iohsc, SPC_OFFSET, SPC_SIZE, &iohspc)) {
120		aprint_error(": can't map SPC registers\n");
121		return;
122	}
123
124	aprint_normal(": 98265A SCSI");
125
126	bus_space_write_1(iot, iohsc, HPSCSI_ID, 0xff);
127	DELAY(100);
128	id = bus_space_read_1(iot, iohsc, HPSCSI_ID);
129	if ((id & ID_WORD_DMA) == 0) {
130		aprint_normal(", 32-bit DMA");
131		dsc->sc_dflags |= SCSI_DMA32;
132	}
133	id &= ID_MASK;
134	aprint_normal(", SCSI ID %d\n", id);
135
136	sc->sc_iot = iot;
137	sc->sc_ioh = iohspc;
138	sc->sc_initiator = id;
139
140	sc->sc_dma_start = spc_dio_dmastart;
141	sc->sc_dma_done  = spc_dio_dmadone;
142
143	dsc->sc_iohsc = iohsc;
144	dsc->sc_dq.dq_softc = dsc;
145	dsc->sc_dq.dq_start = spc_dio_dmago;
146	dsc->sc_dq.dq_done  = spc_dio_dmastop;
147
148	bus_space_write_1(iot, iohsc, HPSCSI_CSR, 0x00);
149	bus_space_write_1(iot, iohsc, HPSCSI_HCONF, 0x00);
150
151	dio_intr_establish(spc_intr, (void *)sc, da->da_ipl, IPL_BIO);
152
153	spc_attach(sc);
154
155	/* Enable SPC interrupts. */
156	bus_space_write_1(iot, iohsc, HPSCSI_CSR, CSR_IE);
157}
158
159static void
160spc_dio_dmastart(struct spc_softc *sc, void *addr, size_t size, int datain)
161{
162	struct spc_dio_softc *dsc = (struct spc_dio_softc *)sc;
163
164	dsc->sc_dq.dq_chan = DMA0 | DMA1;
165	dsc->sc_dflags |= SCSI_HAVEDMA;
166	if (datain)
167		dsc->sc_dflags |= SCSI_DATAIN;
168	else
169		dsc->sc_dflags &= ~SCSI_DATAIN;
170
171	if (dmareq(&dsc->sc_dq) != 0)
172		/* DMA channel is available, so start DMA immediately */
173		spc_dio_dmago(dsc);
174	/* else dma start function will be called later from dmafree(). */
175}
176
177static void
178spc_dio_dmago(void *arg)
179{
180	struct spc_dio_softc *dsc = arg;
181	struct spc_softc *sc = &dsc->sc_spc;
182	bus_space_tag_t iot;
183	bus_space_handle_t iohsc, iohspc;
184	int len, chan;
185	uint32_t dmaflags;
186	uint8_t cmd;
187
188	iot = sc->sc_iot;
189	iohspc = sc->sc_ioh;
190	iohsc = dsc->sc_iohsc;
191
192	bus_space_write_1(iot, iohsc, HPSCSI_HCONF, 0);
193
194	cmd = CSR_IE;
195	dmaflags = DMAGO_NOINT;
196	chan = dsc->sc_dq.dq_chan;
197	if ((dsc->sc_dflags & SCSI_DATAIN) != 0) {
198		cmd |= CSR_DMAIN;
199		dmaflags |= DMAGO_READ;
200	}
201	if ((dsc->sc_dflags & SCSI_DMA32) != 0 &&
202	    ((u_int)sc->sc_dp & 3) == 0 &&
203	    (sc->sc_dleft & 3) == 0) {
204		cmd |= CSR_DMA32;
205		dmaflags |= DMAGO_LWORD;
206	} else
207		dmaflags |= DMAGO_WORD;
208
209	dmago(chan, sc->sc_dp, sc->sc_dleft, dmaflags);
210
211	bus_space_write_1(iot, iohsc, HPSCSI_CSR, cmd);
212	cmd |= (chan == 0) ? CSR_DE0 : CSR_DE1;
213	bus_space_write_1(iot, iohsc, HPSCSI_CSR, cmd);
214
215	cmd = SCMD_XFR;
216	len = sc->sc_dleft;
217
218	if ((len & (DEV_BSIZE - 1)) != 0) /* XXX ??? */ {
219		cmd |= SCMD_PAD;
220#if 0
221		if ((dsc->sc_dflags & SCSI_DATAIN) != 0)
222			len += 2; /* XXX ??? */
223#endif
224	}
225
226	bus_space_write_1(iot, iohspc, TCH, len >> 16);
227	bus_space_write_1(iot, iohspc, TCM, len >>  8);
228	bus_space_write_1(iot, iohspc, TCL, len);
229	bus_space_write_1(iot, iohspc, PCTL, sc->sc_phase | PCTL_BFINT_ENAB);
230	bus_space_write_1(iot, iohspc, SCMD, cmd);
231
232	sc->sc_flags |= SPC_DOINGDMA;
233}
234
235static void
236spc_dio_dmadone(struct spc_softc *sc)
237{
238	struct spc_dio_softc *dsc = (struct spc_dio_softc *)sc;
239	bus_space_tag_t iot;
240	bus_space_handle_t ioh, iohsc;
241	int resid, trans;
242	uint8_t cmd;
243
244	iot = sc->sc_iot;
245	ioh = sc->sc_ioh;
246	iohsc = dsc->sc_iohsc;
247
248	/* wait DMA complete */
249	if ((bus_space_read_1(iot, ioh, SSTS) & SSTS_BUSY) != 0) {
250		int timeout = 1000; /* XXX how long? */
251		while ((bus_space_read_1(iot, ioh, SSTS) & SSTS_BUSY) != 0) {
252			if (--timeout < 0)
253				printf("%s: DMA complete timeout\n",
254				    device_xname(sc->sc_dev));
255			DELAY(1);
256		}
257	}
258
259	if ((dsc->sc_dflags & SCSI_HAVEDMA) != 0) {
260		dmafree(&dsc->sc_dq);
261		dsc->sc_dflags &= ~SCSI_HAVEDMA;
262	}
263
264	cmd = bus_space_read_1(iot, iohsc, HPSCSI_CSR);
265	cmd &= ~(CSR_DE1|CSR_DE0);
266	bus_space_write_1(iot, iohsc, HPSCSI_CSR, cmd);
267
268	resid = bus_space_read_1(iot, ioh, TCH) << 16 |
269	    bus_space_read_1(iot, ioh, TCM) << 8 |
270	    bus_space_read_1(iot, ioh, TCL);
271	trans = sc->sc_dleft - resid;
272	sc->sc_dp += trans;
273	sc->sc_dleft -= trans;
274
275	sc->sc_flags &= ~SPC_DOINGDMA;
276}
277
278static void
279spc_dio_dmastop(void *arg)
280{
281	struct spc_dio_softc *dsc = arg;
282	struct spc_softc *sc = &dsc->sc_spc;
283	uint8_t cmd;
284
285	/* XXX When is this function called? */
286	cmd = bus_space_read_1(sc->sc_iot, dsc->sc_iohsc, HPSCSI_CSR);
287	cmd &= ~(CSR_DE1|CSR_DE0);
288	bus_space_write_1(sc->sc_iot, dsc->sc_iohsc, HPSCSI_CSR, cmd);
289
290	dsc->sc_dflags &= ~SCSI_HAVEDMA;
291	sc->sc_flags &= ~SPC_DOINGDMA;
292}
293