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qapi: Improve specificity of type/member descriptions
[qemu/armbru.git] / hw / ssi / omap_spi.c
blob8f85c3e3918d0771cea58c22c31060b215602a7b
1 /*
2 * TI OMAP processor's Multichannel SPI emulation.
3 *
4 * Copyright (C) 2007-2009 Nokia Corporation
5 *
6 * Original code for OMAP2 by Andrzej Zaborowski <andrew@openedhand.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 or
11 * (at your option) any later version of the License.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include "qemu/osdep.h"
24 #include "qemu/log.h"
25 #include "hw/hw.h"
26 #include "hw/irq.h"
27 #include "hw/arm/omap.h"
28
29 /* Multichannel SPI */
30 struct omap_mcspi_s {
31 MemoryRegion iomem;
32 qemu_irq irq;
33 int chnum;
34
35 uint32_t sysconfig;
36 uint32_t systest;
37 uint32_t irqst;
38 uint32_t irqen;
39 uint32_t wken;
40 uint32_t control;
41
42 struct omap_mcspi_ch_s {
43 qemu_irq txdrq;
44 qemu_irq rxdrq;
45 uint32_t (*txrx)(void *opaque, uint32_t, int);
46 void *opaque;
47
48 uint32_t tx;
49 uint32_t rx;
50
51 uint32_t config;
52 uint32_t status;
53 uint32_t control;
54 } ch[4];
55 };
56
57 static inline void omap_mcspi_interrupt_update(struct omap_mcspi_s *s)
58 {
59 qemu_set_irq(s->irq, s->irqst & s->irqen);
60 }
61
62 static inline void omap_mcspi_dmarequest_update(struct omap_mcspi_ch_s *ch)
63 {
64 qemu_set_irq(ch->txdrq,
65 (ch->control & 1) && /* EN */
66 (ch->config & (1 << 14)) && /* DMAW */
67 (ch->status & (1 << 1)) && /* TXS */
68 ((ch->config >> 12) & 3) != 1); /* TRM */
69 qemu_set_irq(ch->rxdrq,
70 (ch->control & 1) && /* EN */
71 (ch->config & (1 << 15)) && /* DMAW */
72 (ch->status & (1 << 0)) && /* RXS */
73 ((ch->config >> 12) & 3) != 2); /* TRM */
74 }
75
76 static void omap_mcspi_transfer_run(struct omap_mcspi_s *s, int chnum)
77 {
78 struct omap_mcspi_ch_s *ch = s->ch + chnum;
79
80 if (!(ch->control & 1)) /* EN */
81 return;
82 if ((ch->status & (1 << 0)) && /* RXS */
83 ((ch->config >> 12) & 3) != 2 && /* TRM */
84 !(ch->config & (1 << 19))) /* TURBO */
85 goto intr_update;
86 if ((ch->status & (1 << 1)) && /* TXS */
87 ((ch->config >> 12) & 3) != 1) /* TRM */
88 goto intr_update;
89
90 if (!(s->control & 1) || /* SINGLE */
91 (ch->config & (1 << 20))) { /* FORCE */
92 if (ch->txrx)
93 ch->rx = ch->txrx(ch->opaque, ch->tx, /* WL */
94 1 + (0x1f & (ch->config >> 7)));
95 }
96
97 ch->tx = 0;
98 ch->status |= 1 << 2; /* EOT */
99 ch->status |= 1 << 1; /* TXS */
100 if (((ch->config >> 12) & 3) != 2) /* TRM */
101 ch->status |= 1 << 0; /* RXS */
102
103 intr_update:
104 if ((ch->status & (1 << 0)) && /* RXS */
105 ((ch->config >> 12) & 3) != 2 && /* TRM */
106 !(ch->config & (1 << 19))) /* TURBO */
107 s->irqst |= 1 << (2 + 4 * chnum); /* RX_FULL */
108 if ((ch->status & (1 << 1)) && /* TXS */
109 ((ch->config >> 12) & 3) != 1) /* TRM */
110 s->irqst |= 1 << (0 + 4 * chnum); /* TX_EMPTY */
111 omap_mcspi_interrupt_update(s);
112 omap_mcspi_dmarequest_update(ch);
113 }
114
115 void omap_mcspi_reset(struct omap_mcspi_s *s)
116 {
117 int ch;
118
119 s->sysconfig = 0;
120 s->systest = 0;
121 s->irqst = 0;
122 s->irqen = 0;
123 s->wken = 0;
124 s->control = 4;
125
126 for (ch = 0; ch < 4; ch ++) {
127 s->ch[ch].config = 0x060000;
128 s->ch[ch].status = 2; /* TXS */
129 s->ch[ch].control = 0;
130
131 omap_mcspi_dmarequest_update(s->ch + ch);
132 }
133
134 omap_mcspi_interrupt_update(s);
135 }
136
137 static uint64_t omap_mcspi_read(void *opaque, hwaddr addr, unsigned size)
138 {
139 struct omap_mcspi_s *s = opaque;
140 int ch = 0;
141 uint32_t ret;
142
143 if (size != 4) {
144 return omap_badwidth_read32(opaque, addr);
145 }
146
147 switch (addr) {
148 case 0x00: /* MCSPI_REVISION */
149 return 0x91;
150
151 case 0x10: /* MCSPI_SYSCONFIG */
152 return s->sysconfig;
153
154 case 0x14: /* MCSPI_SYSSTATUS */
155 return 1; /* RESETDONE */
156
157 case 0x18: /* MCSPI_IRQSTATUS */
158 return s->irqst;
159
160 case 0x1c: /* MCSPI_IRQENABLE */
161 return s->irqen;
162
163 case 0x20: /* MCSPI_WAKEUPENABLE */
164 return s->wken;
165
166 case 0x24: /* MCSPI_SYST */
167 return s->systest;
168
169 case 0x28: /* MCSPI_MODULCTRL */
170 return s->control;
171
172 case 0x68: ch ++;
173 /* fall through */
174 case 0x54: ch ++;
175 /* fall through */
176 case 0x40: ch ++;
177 /* fall through */
178 case 0x2c: /* MCSPI_CHCONF */
179 return s->ch[ch].config;
180
181 case 0x6c: ch ++;
182 /* fall through */
183 case 0x58: ch ++;
184 /* fall through */
185 case 0x44: ch ++;
186 /* fall through */
187 case 0x30: /* MCSPI_CHSTAT */
188 return s->ch[ch].status;
189
190 case 0x70: ch ++;
191 /* fall through */
192 case 0x5c: ch ++;
193 /* fall through */
194 case 0x48: ch ++;
195 /* fall through */
196 case 0x34: /* MCSPI_CHCTRL */
197 return s->ch[ch].control;
198
199 case 0x74: ch ++;
200 /* fall through */
201 case 0x60: ch ++;
202 /* fall through */
203 case 0x4c: ch ++;
204 /* fall through */
205 case 0x38: /* MCSPI_TX */
206 return s->ch[ch].tx;
207
208 case 0x78: ch ++;
209 /* fall through */
210 case 0x64: ch ++;
211 /* fall through */
212 case 0x50: ch ++;
213 /* fall through */
214 case 0x3c: /* MCSPI_RX */
215 s->ch[ch].status &= ~(1 << 0); /* RXS */
216 ret = s->ch[ch].rx;
217 omap_mcspi_transfer_run(s, ch);
218 return ret;
219 }
220
221 OMAP_BAD_REG(addr);
222 return 0;
223 }
224
225 static void omap_mcspi_write(void *opaque, hwaddr addr,
226 uint64_t value, unsigned size)
227 {
228 struct omap_mcspi_s *s = opaque;
229 int ch = 0;
230
231 if (size != 4) {
232 omap_badwidth_write32(opaque, addr, value);
233 return;
234 }
235
236 switch (addr) {
237 case 0x00: /* MCSPI_REVISION */
238 case 0x14: /* MCSPI_SYSSTATUS */
239 case 0x30: /* MCSPI_CHSTAT0 */
240 case 0x3c: /* MCSPI_RX0 */
241 case 0x44: /* MCSPI_CHSTAT1 */
242 case 0x50: /* MCSPI_RX1 */
243 case 0x58: /* MCSPI_CHSTAT2 */
244 case 0x64: /* MCSPI_RX2 */
245 case 0x6c: /* MCSPI_CHSTAT3 */
246 case 0x78: /* MCSPI_RX3 */
247 OMAP_RO_REG(addr);
248 return;
249
250 case 0x10: /* MCSPI_SYSCONFIG */
251 if (value & (1 << 1)) /* SOFTRESET */
252 omap_mcspi_reset(s);
253 s->sysconfig = value & 0x31d;
254 break;
255
256 case 0x18: /* MCSPI_IRQSTATUS */
257 if (!((s->control & (1 << 3)) && (s->systest & (1 << 11)))) {
258 s->irqst &= ~value;
259 omap_mcspi_interrupt_update(s);
260 }
261 break;
262
263 case 0x1c: /* MCSPI_IRQENABLE */
264 s->irqen = value & 0x1777f;
265 omap_mcspi_interrupt_update(s);
266 break;
267
268 case 0x20: /* MCSPI_WAKEUPENABLE */
269 s->wken = value & 1;
270 break;
271
272 case 0x24: /* MCSPI_SYST */
273 if (s->control & (1 << 3)) /* SYSTEM_TEST */
274 if (value & (1 << 11)) { /* SSB */
275 s->irqst |= 0x1777f;
276 omap_mcspi_interrupt_update(s);
277 }
278 s->systest = value & 0xfff;
279 break;
280
281 case 0x28: /* MCSPI_MODULCTRL */
282 if (value & (1 << 3)) /* SYSTEM_TEST */
283 if (s->systest & (1 << 11)) { /* SSB */
284 s->irqst |= 0x1777f;
285 omap_mcspi_interrupt_update(s);
286 }
287 s->control = value & 0xf;
288 break;
289
290 case 0x68: ch ++;
291 /* fall through */
292 case 0x54: ch ++;
293 /* fall through */
294 case 0x40: ch ++;
295 /* fall through */
296 case 0x2c: /* MCSPI_CHCONF */
297 if ((value ^ s->ch[ch].config) & (3 << 14)) /* DMAR | DMAW */
298 omap_mcspi_dmarequest_update(s->ch + ch);
299 if (((value >> 12) & 3) == 3) { /* TRM */
300 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid TRM value (3)\n",
301 __func__);
302 }
303 if (((value >> 7) & 0x1f) < 3) { /* WL */
304 qemu_log_mask(LOG_GUEST_ERROR,
305 "%s: invalid WL value (%" PRIx64 ")\n",
306 __func__, (value >> 7) & 0x1f);
307 }
308 s->ch[ch].config = value & 0x7fffff;
309 break;
310
311 case 0x70: ch ++;
312 /* fall through */
313 case 0x5c: ch ++;
314 /* fall through */
315 case 0x48: ch ++;
316 /* fall through */
317 case 0x34: /* MCSPI_CHCTRL */
318 if (value & ~s->ch[ch].control & 1) { /* EN */
319 s->ch[ch].control |= 1;
320 omap_mcspi_transfer_run(s, ch);
321 } else
322 s->ch[ch].control = value & 1;
323 break;
324
325 case 0x74: ch ++;
326 /* fall through */
327 case 0x60: ch ++;
328 /* fall through */
329 case 0x4c: ch ++;
330 /* fall through */
331 case 0x38: /* MCSPI_TX */
332 s->ch[ch].tx = value;
333 s->ch[ch].status &= ~(1 << 1); /* TXS */
334 omap_mcspi_transfer_run(s, ch);
335 break;
336
337 default:
338 OMAP_BAD_REG(addr);
339 return;
340 }
341 }
342
343 static const MemoryRegionOps omap_mcspi_ops = {
344 .read = omap_mcspi_read,
345 .write = omap_mcspi_write,
346 .endianness = DEVICE_NATIVE_ENDIAN,
347 };
348
349 struct omap_mcspi_s *omap_mcspi_init(struct omap_target_agent_s *ta, int chnum,
350 qemu_irq irq, qemu_irq *drq, omap_clk fclk, omap_clk iclk)
351 {
352 struct omap_mcspi_s *s = g_new0(struct omap_mcspi_s, 1);
353 struct omap_mcspi_ch_s *ch = s->ch;
354
355 s->irq = irq;
356 s->chnum = chnum;
357 while (chnum --) {
358 ch->txdrq = *drq ++;
359 ch->rxdrq = *drq ++;
360 ch ++;
361 }
362 omap_mcspi_reset(s);
363
364 memory_region_init_io(&s->iomem, NULL, &omap_mcspi_ops, s, "omap.mcspi",
365 omap_l4_region_size(ta, 0));
366 omap_l4_attach(ta, 0, &s->iomem);
367
368 return s;
369 }
370
371 void omap_mcspi_attach(struct omap_mcspi_s *s,
372 uint32_t (*txrx)(void *opaque, uint32_t, int), void *opaque,
373 int chipselect)
374 {
375 if (chipselect < 0 || chipselect >= s->chnum)
376 hw_error("%s: Bad chipselect %i\n", __func__, chipselect);
377
378 s->ch[chipselect].txrx = txrx;
379 s->ch[chipselect].opaque = opaque;
380 }
armbru's QEMU hackery