wdc_mb.c revision 1.31 
1/*	$NetBSD: wdc_mb.c,v 1.31 2008/03/18 20:46:35 cube Exp $	*/
2
3/*-
4 * Copyright (c) 1998, 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum and by Onno van der Linden.
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__KERNEL_RCSID(0, "$NetBSD: wdc_mb.c,v 1.31 2008/03/18 20:46:35 cube Exp $");
41
42#include <sys/types.h>
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/malloc.h>
46#include <sys/device.h>
47
48#include <sys/bswap.h>
49#include <machine/cpu.h>
50#include <machine/bus.h>
51#include <machine/iomap.h>
52#include <machine/mfp.h>
53#include <machine/dma.h>
54
55#include <dev/ata/atavar.h>
56#include <dev/ic/wdcvar.h>
57
58#include <m68k/asm_single.h>
59
60#include <atari/dev/ym2149reg.h>
61#include <atari/atari/device.h>
62
63/* Falcon IDE register locations (base and offsets). */
64#define FALCON_WD_BASE	0xfff00000
65#define FALCON_WD_LEN	0x40
66#define FALCON_WD_AUX	0x38
67
68/*
69 * XXX This code currently doesn't even try to allow 32-bit data port use.
70 */
71static int	claim_hw (struct ata_channel *, int);
72static void	free_hw (struct ata_channel *);
73static void	read_multi_2_swap (bus_space_tag_t, bus_space_handle_t,
74				bus_size_t, u_int16_t *, bus_size_t);
75static void	write_multi_2_swap (bus_space_tag_t, bus_space_handle_t,
76				bus_size_t, const u_int16_t *, bus_size_t);
77
78struct wdc_mb_softc {
79	struct wdc_softc sc_wdcdev;
80	struct	ata_channel *sc_chanlist[1];
81	struct  ata_channel sc_channel;
82	struct	ata_queue sc_chqueue;
83	struct	wdc_regs sc_wdc_regs;
84	void	*sc_ih;
85};
86
87int	wdc_mb_probe	(device_t, struct cfdata *, void *);
88void	wdc_mb_attach	(device_t, device_t, void *);
89
90CFATTACH_DECL_NEW(wdc_mb, sizeof(struct wdc_mb_softc),
91    wdc_mb_probe, wdc_mb_attach, NULL, NULL);
92
93int
94wdc_mb_probe(device_t parent, cfdata_t cfp, void *aux)
95{
96	static int	wdc_matched = 0;
97	struct ata_channel ch;
98	struct wdc_softc wdc;
99	struct wdc_regs wdr;
100	int	result = 0, i;
101	u_char	sv_ierb;
102
103	if ((machineid & ATARI_TT) || strcmp("wdc", aux) || wdc_matched)
104		return 0;
105	if (!atari_realconfig)
106		return 0;
107
108	memset(&wdc, 0, sizeof(wdc));
109	memset(&ch, 0, sizeof(ch));
110	ch.ch_atac = &wdc.sc_atac;
111	wdc.regs = &wdr;
112
113	wdr.cmd_iot = wdr.ctl_iot = mb_alloc_bus_space_tag();
114	if (wdr.cmd_iot == NULL)
115		return 0;
116	wdr.cmd_iot->stride = 0;
117	wdr.cmd_iot->wo_1   = 1;
118
119	if (bus_space_map(wdr.cmd_iot, FALCON_WD_BASE, FALCON_WD_LEN, 0,
120	    &wdr.cmd_baseioh))
121		goto out;
122	for (i = 0; i < WDC_NREG; i++) {
123		if (bus_space_subregion(wdr.cmd_iot, wdr.cmd_baseioh,
124		    i * 4, 4, &wdr.cmd_iohs[i]) != 0)
125			goto outunmap;
126	}
127	wdc_init_shadow_regs(&ch);
128
129	if (bus_space_subregion(wdr.cmd_iot, wdr.cmd_baseioh, FALCON_WD_AUX, 4,
130	    &wdr.ctl_ioh))
131		goto outunmap;
132
133	/*
134	 * Make sure IDE interrupts are disabled during probing.
135	 */
136	sv_ierb = MFP->mf_ierb;
137	MFP->mf_ierb &= ~IB_DINT;
138
139	/*
140	 * Make sure that IDE is turned on on the Falcon.
141	 */
142	if (machineid & ATARI_FALCON)
143		ym2149_ser2(0);
144
145	result = wdcprobe(&ch);
146
147	MFP->mf_ierb = sv_ierb;
148
149 outunmap:
150	bus_space_unmap(wdr.cmd_iot, wdr.cmd_baseioh, FALCON_WD_LEN);
151 out:
152	mb_free_bus_space_tag(wdr.cmd_iot);
153
154	if (result)
155		wdc_matched = 1;
156	return (result);
157}
158
159void
160wdc_mb_attach(device_t parent, device_t self, void *aux)
161{
162	struct wdc_mb_softc *sc = device_private(self);
163	struct wdc_regs *wdr;
164	int i;
165
166	aprint_normal("\n");
167
168	sc->sc_wdcdev.sc_atac.atac_dev = self;
169	sc->sc_wdcdev.regs = wdr = &sc->sc_wdc_regs;
170	wdr->cmd_iot = wdr->ctl_iot =
171	    mb_alloc_bus_space_tag();
172	wdr->cmd_iot->stride = 0;
173	wdr->cmd_iot->wo_1   = 1;
174	wdr->cmd_iot->abs_rms_2 = read_multi_2_swap;
175	wdr->cmd_iot->abs_wms_2 = write_multi_2_swap;
176	if (bus_space_map(wdr->cmd_iot, FALCON_WD_BASE, FALCON_WD_LEN, 0,
177			  &wdr->cmd_baseioh)) {
178		aprint_error_dev(self, "couldn't map registers\n");
179		return;
180	}
181	for (i = 0; i < WDC_NREG; i++) {
182		if (bus_space_subregion(wdr->cmd_iot, wdr->cmd_baseioh,
183		    i * 4, 4, &wdr->cmd_iohs[i]) != 0) {
184			aprint_error_dev(self,
185			    "couldn't subregion cmd reg %i\n", i);
186			bus_space_unmap(wdr->cmd_iot, wdr->cmd_baseioh,
187			    FALCON_WD_LEN);
188			return;
189		}
190	}
191
192	if (bus_space_subregion(wdr->cmd_iot,
193	    wdr->cmd_baseioh, FALCON_WD_AUX, 4, &wdr->ctl_ioh)) {
194		bus_space_unmap(wdr->cmd_iot, wdr->cmd_baseioh, FALCON_WD_LEN);
195		aprint_error_dev(self, "couldn't subregion aux reg\n");
196		return;
197	}
198
199	/*
200	 * Play a nasty trick here. Normally we only manipulate the
201	 * interrupt *mask*. However to defeat wd_get_parms(), we
202	 * disable the interrupts here using the *enable* register.
203	 */
204	MFP->mf_ierb &= ~IB_DINT;
205
206	sc->sc_wdcdev.sc_atac.atac_cap |= ATAC_CAP_DATA16 |
207	    ATAC_CAP_ATA_NOSTREAM;
208	sc->sc_wdcdev.sc_atac.atac_pio_cap = 0;
209	sc->sc_wdcdev.sc_atac.atac_claim_hw = &claim_hw;
210	sc->sc_wdcdev.sc_atac.atac_free_hw  = &free_hw;
211	sc->sc_chanlist[0] = &sc->sc_channel;
212	sc->sc_wdcdev.sc_atac.atac_channels = sc->sc_chanlist;
213	sc->sc_wdcdev.sc_atac.atac_nchannels = 1;
214	sc->sc_channel.ch_channel = 0;
215	sc->sc_channel.ch_atac = &sc->sc_wdcdev.sc_atac;
216	sc->sc_channel.ch_queue = &sc->sc_chqueue;
217	sc->sc_channel.ch_ndrive = 2;
218	wdc_init_shadow_regs(&sc->sc_channel);
219
220	/*
221	 * Setup & enable disk related interrupts.
222	 */
223	MFP->mf_ierb |= IB_DINT;
224	MFP->mf_iprb  = (u_int8_t)~IB_DINT;
225	MFP->mf_imrb |= IB_DINT;
226
227	wdcattach(&sc->sc_channel);
228}
229
230/*
231 * Hardware locking
232 */
233static int	wd_lock;
234
235static int
236claim_hw(chp, maysleep)
237struct ata_channel *chp;
238int  maysleep;
239{
240	if (wd_lock != DMA_LOCK_GRANT) {
241		if (wd_lock == DMA_LOCK_REQ) {
242			/*
243			 * ST_DMA access is being claimed.
244			 */
245			return 0;
246		}
247		if (!st_dmagrab((dma_farg)wdcintr,
248		    (dma_farg)(maysleep ? NULL : wdcrestart), chp,
249		    &wd_lock, 1))
250			return 0;
251	}
252	return 1;
253}
254
255static void
256free_hw(chp)
257struct ata_channel *chp;
258{
259	/*
260	 * Flush pending interrupts before giving-up lock
261	 */
262	MFP->mf_iprb = (u_int8_t)~IB_DINT;
263
264	/*
265	 * Only free the lock on a Falcon. On the Hades, keep it.
266	 */
267/*	if (machineid & ATARI_FALCON) */
268		st_dmafree(chp, &wd_lock);
269}
270
271/*
272 * XXX
273 * This piece of uglyness is caused by the fact that the byte lanes of
274 * the data-register are swapped on the atari. This works OK for an IDE
275 * disk, but turns into a nightmare when used on atapi devices.
276 */
277#define calc_addr(base, off, stride, wm)	\
278	((u_long)(base) + ((off) << (stride)) + (wm))
279
280static void
281read_multi_2_swap(t, h, o, a, c)
282	bus_space_tag_t		t;
283	bus_space_handle_t	h;
284	bus_size_t		o, c;
285	u_int16_t		*a;
286{
287	u_int16_t	*ba;
288
289	ba = (u_int16_t *)calc_addr(h, o, t->stride, t->wo_2);
290	for (; c; a++, c--)
291		*a = bswap16(*ba);
292}
293
294static void
295write_multi_2_swap(t, h, o, a, c)
296	bus_space_tag_t		t;
297	bus_space_handle_t	h;
298	bus_size_t		o, c;
299	const u_int16_t		*a;
300{
301	u_int16_t	*ba;
302
303	ba = (u_int16_t *)calc_addr(h, o, t->stride, t->wo_2);
304	for (; c; a++, c--)
305		*ba = bswap16(*a);
306}
307