1 /* $NetBSD: wdc_mb.c,v 1.43 2023/12/20 00:40:42 thorpej 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 *
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 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: wdc_mb.c,v 1.43 2023/12/20 00:40:42 thorpej Exp $");
34
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/device.h>
39
40 #include <sys/bswap.h>
41 #include <machine/cpu.h>
42 #include <sys/bus.h>
43 #include <machine/iomap.h>
44 #include <machine/mfp.h>
45 #include <machine/dma.h>
46
47 #include <dev/ata/atavar.h>
48 #include <dev/ic/wdcvar.h>
49
50 #include <m68k/asm_single.h>
51
52 #include <atari/dev/ym2149reg.h>
53 #include <atari/atari/device.h>
54
55 /* Falcon IDE register locations (base and offsets). */
56 #define FALCON_WD_BASE 0xfff00000
57 #define FALCON_WD_LEN 0x40
58 #define FALCON_WD_AUX 0x38
59
60 /*
61 * XXX This code currently doesn't even try to allow 32-bit data port use.
62 */
63 static int claim_hw(struct ata_channel *, int);
64 static void free_hw(struct ata_channel *);
65 static void read_multi_2_swap(bus_space_tag_t, bus_space_handle_t,
66 bus_size_t, uint16_t *, bus_size_t);
67 static void write_multi_2_swap(bus_space_tag_t, bus_space_handle_t,
68 bus_size_t, const uint16_t *, bus_size_t);
69
70 struct wdc_mb_softc {
71 struct wdc_softc sc_wdcdev;
72 struct ata_channel *sc_chanlist[1];
73 struct ata_channel sc_channel;
74 struct wdc_regs sc_wdc_regs;
75 void *sc_ih;
76 };
77
78 static int wdc_mb_probe(device_t, struct cfdata *, void *);
79 static void wdc_mb_attach(device_t, device_t, void *);
80
81 CFATTACH_DECL_NEW(wdc_mb, sizeof(struct wdc_mb_softc),
82 wdc_mb_probe, wdc_mb_attach, NULL, NULL);
83
84 static int
wdc_mb_probe(device_t parent,cfdata_t cfp,void * aux)85 wdc_mb_probe(device_t parent, cfdata_t cfp, void *aux)
86 {
87 static int wdc_matched = 0;
88 struct wdc_regs wdr;
89 int result = 0, i;
90 uint8_t sv_ierb;
91
92 if ((machineid & ATARI_TT) || strcmp("wdc", aux) || wdc_matched)
93 return 0;
94 if (!atari_realconfig)
95 return 0;
96
97 wdr.cmd_iot = wdr.ctl_iot = mb_alloc_bus_space_tag();
98 if (wdr.cmd_iot == NULL)
99 return 0;
100 wdr.cmd_iot->stride = 0;
101 wdr.cmd_iot->wo_1 = 1;
102
103 if (bus_space_map(wdr.cmd_iot, FALCON_WD_BASE, FALCON_WD_LEN, 0,
104 &wdr.cmd_baseioh))
105 goto out;
106 for (i = 0; i < WDC_NREG; i++) {
107 if (bus_space_subregion(wdr.cmd_iot, wdr.cmd_baseioh,
108 i * 4, 4, &wdr.cmd_iohs[i]) != 0)
109 goto outunmap;
110 }
111 wdc_init_shadow_regs(&wdr);
112
113 if (bus_space_subregion(wdr.cmd_iot, wdr.cmd_baseioh, FALCON_WD_AUX, 4,
114 &wdr.ctl_ioh))
115 goto outunmap;
116
117 /*
118 * Make sure IDE interrupts are disabled during probing.
119 */
120 sv_ierb = MFP->mf_ierb;
121 MFP->mf_ierb &= ~IB_DINT;
122
123 /*
124 * Make sure that IDE is turned on on the Falcon.
125 */
126 if (machineid & ATARI_FALCON)
127 ym2149_ser2(0);
128
129 result = wdcprobe(&wdr);
130
131 MFP->mf_ierb = sv_ierb;
132
133 outunmap:
134 bus_space_unmap(wdr.cmd_iot, wdr.cmd_baseioh, FALCON_WD_LEN);
135 out:
136 mb_free_bus_space_tag(wdr.cmd_iot);
137
138 if (result)
139 wdc_matched = 1;
140 return result;
141 }
142
143 static void
wdc_mb_attach(device_t parent,device_t self,void * aux)144 wdc_mb_attach(device_t parent, device_t self, void *aux)
145 {
146 struct wdc_mb_softc *sc = device_private(self);
147 struct wdc_regs *wdr;
148 int i;
149
150 aprint_normal("\n");
151
152 sc->sc_wdcdev.sc_atac.atac_dev = self;
153 sc->sc_wdcdev.regs = wdr = &sc->sc_wdc_regs;
154 wdr->cmd_iot = wdr->ctl_iot =
155 mb_alloc_bus_space_tag();
156 wdr->cmd_iot->stride = 0;
157 wdr->cmd_iot->wo_1 = 1;
158 wdr->cmd_iot->abs_rms_2 = read_multi_2_swap;
159 wdr->cmd_iot->abs_wms_2 = write_multi_2_swap;
160 if (bus_space_map(wdr->cmd_iot, FALCON_WD_BASE, FALCON_WD_LEN, 0,
161 &wdr->cmd_baseioh)) {
162 aprint_error_dev(self, "couldn't map registers\n");
163 return;
164 }
165 for (i = 0; i < WDC_NREG; i++) {
166 if (bus_space_subregion(wdr->cmd_iot, wdr->cmd_baseioh,
167 i * 4, 4, &wdr->cmd_iohs[i]) != 0) {
168 aprint_error_dev(self,
169 "couldn't subregion cmd reg %i\n", i);
170 bus_space_unmap(wdr->cmd_iot, wdr->cmd_baseioh,
171 FALCON_WD_LEN);
172 return;
173 }
174 }
175
176 if (bus_space_subregion(wdr->cmd_iot,
177 wdr->cmd_baseioh, FALCON_WD_AUX, 4, &wdr->ctl_ioh)) {
178 bus_space_unmap(wdr->cmd_iot, wdr->cmd_baseioh, FALCON_WD_LEN);
179 aprint_error_dev(self, "couldn't subregion aux reg\n");
180 return;
181 }
182
183 /*
184 * Play a nasty trick here. Normally we only manipulate the
185 * interrupt *mask*. However to defeat wd_get_parms(), we
186 * disable the interrupts here using the *enable* register.
187 */
188 MFP->mf_ierb &= ~IB_DINT;
189
190 sc->sc_wdcdev.sc_atac.atac_cap |= ATAC_CAP_DATA16 |
191 ATAC_CAP_ATA_NOSTREAM;
192 sc->sc_wdcdev.sc_atac.atac_pio_cap = 0;
193 sc->sc_wdcdev.sc_atac.atac_claim_hw = &claim_hw;
194 sc->sc_wdcdev.sc_atac.atac_free_hw = &free_hw;
195 sc->sc_chanlist[0] = &sc->sc_channel;
196 sc->sc_wdcdev.sc_atac.atac_channels = sc->sc_chanlist;
197 sc->sc_wdcdev.sc_atac.atac_nchannels = 1;
198 sc->sc_wdcdev.wdc_maxdrives = 2;
199 sc->sc_channel.ch_channel = 0;
200 sc->sc_channel.ch_atac = &sc->sc_wdcdev.sc_atac;
201
202 wdc_init_shadow_regs(wdr);
203
204 /*
205 * Setup & enable disk related interrupts.
206 */
207 MFP->mf_ierb |= IB_DINT;
208 MFP->mf_iprb = (uint8_t)~IB_DINT;
209 MFP->mf_imrb |= IB_DINT;
210
211 wdcattach(&sc->sc_channel);
212 }
213
214 /*
215 * Hardware locking
216 */
217 static int wd_lock;
218
219 static int
claim_hw(struct ata_channel * chp,int maysleep)220 claim_hw(struct ata_channel *chp, int maysleep)
221 {
222 ata_channel_lock_owned(chp);
223
224 if (wd_lock != DMA_LOCK_GRANT) {
225 if (wd_lock == DMA_LOCK_REQ) {
226 /*
227 * ST_DMA access is being claimed.
228 */
229 return 0;
230 }
231 if (!st_dmagrab((dma_farg)wdcintr,
232 (dma_farg)(maysleep ? NULL : wdcrestart), chp,
233 &wd_lock, 1, &chp->ch_lock))
234 return 0;
235 }
236 return 1;
237 }
238
239 static void
free_hw(struct ata_channel * chp)240 free_hw(struct ata_channel *chp)
241 {
242 ata_channel_lock_owned(chp);
243
244 /*
245 * Flush pending interrupts before giving-up lock
246 */
247 MFP->mf_iprb = (uint8_t)~IB_DINT;
248
249 /*
250 * Only free the lock on a Falcon. On the Hades, keep it.
251 */
252 /* if (machineid & ATARI_FALCON) */
253 st_dmafree(chp, &wd_lock);
254 }
255
256 /*
257 * XXX
258 * This piece of uglyness is caused by the fact that the byte lanes of
259 * the data-register are swapped on the atari. This works OK for an IDE
260 * disk, but turns into a nightmare when used on atapi devices.
261 */
262 #define calc_addr(base, off, stride, wm) \
263 ((u_long)(base) + ((off) << (stride)) + (wm))
264
265 static void
read_multi_2_swap(bus_space_tag_t t,bus_space_handle_t h,bus_size_t o,uint16_t * a,bus_size_t c)266 read_multi_2_swap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
267 uint16_t *a, bus_size_t c)
268 {
269 volatile uint16_t *ba;
270
271 ba = (volatile uint16_t *)calc_addr(h, o, t->stride, t->wo_2);
272 for (; c; a++, c--)
273 *a = bswap16(*ba);
274 }
275
276 static void
write_multi_2_swap(bus_space_tag_t t,bus_space_handle_t h,bus_size_t o,const uint16_t * a,bus_size_t c)277 write_multi_2_swap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
278 const uint16_t *a, bus_size_t c)
279 {
280 volatile uint16_t *ba;
281
282 ba = (volatile uint16_t *)calc_addr(h, o, t->stride, t->wo_2);
283 for (; c; a++, c--)
284 *ba = bswap16(*a);
285 }
286