1 /*
2 * SuperH Timer modules.
3 *
4 * Copyright (c) 2007 Magnus Damm
5 * Based on arm_timer.c by Paul Brook
6 * Copyright (c) 2005-2006 CodeSourcery.
7 *
8 * This code is licensed under the GPL.
9 */
10
11 #include "qemu/osdep.h"
12 #include "exec/memory.h"
13 #include "qemu/log.h"
14 #include "hw/irq.h"
15 #include "hw/sh4/sh.h"
16 #include "hw/timer/tmu012.h"
17 #include "hw/ptimer.h"
18 #include "trace.h"
19
20 #define TIMER_TCR_TPSC (7 << 0)
21 #define TIMER_TCR_CKEG (3 << 3)
22 #define TIMER_TCR_UNIE (1 << 5)
23 #define TIMER_TCR_ICPE (3 << 6)
24 #define TIMER_TCR_UNF (1 << 8)
25 #define TIMER_TCR_ICPF (1 << 9)
26 #define TIMER_TCR_RESERVED (0x3f << 10)
27
28 #define TIMER_FEAT_CAPT (1 << 0)
29 #define TIMER_FEAT_EXTCLK (1 << 1)
30
31 #define OFFSET_TCOR 0
32 #define OFFSET_TCNT 1
33 #define OFFSET_TCR 2
34 #define OFFSET_TCPR 3
35
36 typedef struct {
37 ptimer_state *timer;
38 uint32_t tcnt;
39 uint32_t tcor;
40 uint32_t tcr;
41 uint32_t tcpr;
42 int freq;
43 int int_level;
44 int old_level;
45 int feat;
46 int enabled;
47 qemu_irq irq;
48 } SHTimerState;
49
50 /* Check all active timers, and schedule the next timer interrupt. */
51
sh_timer_update(SHTimerState * s)52 static void sh_timer_update(SHTimerState *s)
53 {
54 int new_level = s->int_level && (s->tcr & TIMER_TCR_UNIE);
55
56 if (new_level != s->old_level) {
57 qemu_set_irq(s->irq, new_level);
58 }
59 s->old_level = s->int_level;
60 s->int_level = new_level;
61 }
62
sh_timer_read(void * opaque,hwaddr offset)63 static uint32_t sh_timer_read(void *opaque, hwaddr offset)
64 {
65 SHTimerState *s = opaque;
66
67 switch (offset >> 2) {
68 case OFFSET_TCOR:
69 return s->tcor;
70 case OFFSET_TCNT:
71 return ptimer_get_count(s->timer);
72 case OFFSET_TCR:
73 return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0);
74 case OFFSET_TCPR:
75 if (s->feat & TIMER_FEAT_CAPT) {
76 return s->tcpr;
77 }
78 }
79 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
80 __func__, offset);
81 return 0;
82 }
83
sh_timer_write(void * opaque,hwaddr offset,uint32_t value)84 static void sh_timer_write(void *opaque, hwaddr offset, uint32_t value)
85 {
86 SHTimerState *s = opaque;
87 int freq;
88
89 switch (offset >> 2) {
90 case OFFSET_TCOR:
91 s->tcor = value;
92 ptimer_transaction_begin(s->timer);
93 ptimer_set_limit(s->timer, s->tcor, 0);
94 ptimer_transaction_commit(s->timer);
95 break;
96 case OFFSET_TCNT:
97 s->tcnt = value;
98 ptimer_transaction_begin(s->timer);
99 ptimer_set_count(s->timer, s->tcnt);
100 ptimer_transaction_commit(s->timer);
101 break;
102 case OFFSET_TCR:
103 ptimer_transaction_begin(s->timer);
104 if (s->enabled) {
105 /*
106 * Pause the timer if it is running. This may cause some inaccuracy
107 * due to rounding, but avoids a whole lot of other messiness
108 */
109 ptimer_stop(s->timer);
110 }
111 freq = s->freq;
112 /* ??? Need to recalculate expiry time after changing divisor. */
113 switch (value & TIMER_TCR_TPSC) {
114 case 0:
115 freq >>= 2;
116 break;
117 case 1:
118 freq >>= 4;
119 break;
120 case 2:
121 freq >>= 6;
122 break;
123 case 3:
124 freq >>= 8;
125 break;
126 case 4:
127 freq >>= 10;
128 break;
129 case 6:
130 case 7:
131 if (s->feat & TIMER_FEAT_EXTCLK) {
132 break;
133 }
134 /* fallthrough */
135 default:
136 qemu_log_mask(LOG_GUEST_ERROR,
137 "%s: Reserved TPSC value\n", __func__);
138 }
139 switch ((value & TIMER_TCR_CKEG) >> 3) {
140 case 0:
141 break;
142 case 1:
143 case 2:
144 case 3:
145 if (s->feat & TIMER_FEAT_EXTCLK) {
146 break;
147 }
148 /* fallthrough */
149 default:
150 qemu_log_mask(LOG_GUEST_ERROR,
151 "%s: Reserved CKEG value\n", __func__);
152 }
153 switch ((value & TIMER_TCR_ICPE) >> 6) {
154 case 0:
155 break;
156 case 2:
157 case 3:
158 if (s->feat & TIMER_FEAT_CAPT) {
159 break;
160 }
161 /* fallthrough */
162 default:
163 qemu_log_mask(LOG_GUEST_ERROR,
164 "%s: Reserved ICPE value\n", __func__);
165 }
166 if ((value & TIMER_TCR_UNF) == 0) {
167 s->int_level = 0;
168 }
169
170 value &= ~TIMER_TCR_UNF;
171
172 if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT))) {
173 qemu_log_mask(LOG_GUEST_ERROR,
174 "%s: Reserved ICPF value\n", __func__);
175 }
176
177 value &= ~TIMER_TCR_ICPF; /* capture not supported */
178
179 if (value & TIMER_TCR_RESERVED) {
180 qemu_log_mask(LOG_GUEST_ERROR,
181 "%s: Reserved TCR bits set\n", __func__);
182 }
183 s->tcr = value;
184 ptimer_set_limit(s->timer, s->tcor, 0);
185 ptimer_set_freq(s->timer, freq);
186 if (s->enabled) {
187 /* Restart the timer if still enabled. */
188 ptimer_run(s->timer, 0);
189 }
190 ptimer_transaction_commit(s->timer);
191 break;
192 case OFFSET_TCPR:
193 if (s->feat & TIMER_FEAT_CAPT) {
194 s->tcpr = value;
195 break;
196 }
197 /* fallthrough */
198 default:
199 qemu_log_mask(LOG_GUEST_ERROR,
200 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
201 }
202 sh_timer_update(s);
203 }
204
sh_timer_start_stop(void * opaque,int enable)205 static void sh_timer_start_stop(void *opaque, int enable)
206 {
207 SHTimerState *s = opaque;
208
209 trace_sh_timer_start_stop(enable, s->enabled);
210 ptimer_transaction_begin(s->timer);
211 if (s->enabled && !enable) {
212 ptimer_stop(s->timer);
213 }
214 if (!s->enabled && enable) {
215 ptimer_run(s->timer, 0);
216 }
217 ptimer_transaction_commit(s->timer);
218 s->enabled = !!enable;
219 }
220
sh_timer_tick(void * opaque)221 static void sh_timer_tick(void *opaque)
222 {
223 SHTimerState *s = opaque;
224 s->int_level = s->enabled;
225 sh_timer_update(s);
226 }
227
sh_timer_init(uint32_t freq,int feat,qemu_irq irq)228 static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq)
229 {
230 SHTimerState *s;
231
232 s = g_malloc0(sizeof(*s));
233 s->freq = freq;
234 s->feat = feat;
235 s->tcor = 0xffffffff;
236 s->tcnt = 0xffffffff;
237 s->tcpr = 0xdeadbeef;
238 s->tcr = 0;
239 s->enabled = 0;
240 s->irq = irq;
241
242 s->timer = ptimer_init(sh_timer_tick, s, PTIMER_POLICY_LEGACY);
243
244 sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor);
245 sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt);
246 sh_timer_write(s, OFFSET_TCPR >> 2, s->tcpr);
247 sh_timer_write(s, OFFSET_TCR >> 2, s->tcpr);
248 /* ??? Save/restore. */
249 return s;
250 }
251
252 typedef struct {
253 MemoryRegion iomem;
254 MemoryRegion iomem_p4;
255 MemoryRegion iomem_a7;
256 void *timer[3];
257 int level[3];
258 uint32_t tocr;
259 uint32_t tstr;
260 int feat;
261 } tmu012_state;
262
tmu012_read(void * opaque,hwaddr offset,unsigned size)263 static uint64_t tmu012_read(void *opaque, hwaddr offset, unsigned size)
264 {
265 tmu012_state *s = opaque;
266
267 trace_sh_timer_read(offset);
268 if (offset >= 0x20) {
269 if (!(s->feat & TMU012_FEAT_3CHAN)) {
270 qemu_log_mask(LOG_GUEST_ERROR,
271 "%s: Bad channel offset 0x%" HWADDR_PRIx "\n",
272 __func__, offset);
273 }
274 return sh_timer_read(s->timer[2], offset - 0x20);
275 }
276
277 if (offset >= 0x14) {
278 return sh_timer_read(s->timer[1], offset - 0x14);
279 }
280 if (offset >= 0x08) {
281 return sh_timer_read(s->timer[0], offset - 0x08);
282 }
283 if (offset == 4) {
284 return s->tstr;
285 }
286 if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
287 return s->tocr;
288 }
289
290 qemu_log_mask(LOG_GUEST_ERROR,
291 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
292 return 0;
293 }
294
tmu012_write(void * opaque,hwaddr offset,uint64_t value,unsigned size)295 static void tmu012_write(void *opaque, hwaddr offset,
296 uint64_t value, unsigned size)
297 {
298 tmu012_state *s = opaque;
299
300 trace_sh_timer_write(offset, value);
301 if (offset >= 0x20) {
302 if (!(s->feat & TMU012_FEAT_3CHAN)) {
303 qemu_log_mask(LOG_GUEST_ERROR,
304 "%s: Bad channel offset 0x%" HWADDR_PRIx "\n",
305 __func__, offset);
306 }
307 sh_timer_write(s->timer[2], offset - 0x20, value);
308 return;
309 }
310
311 if (offset >= 0x14) {
312 sh_timer_write(s->timer[1], offset - 0x14, value);
313 return;
314 }
315
316 if (offset >= 0x08) {
317 sh_timer_write(s->timer[0], offset - 0x08, value);
318 return;
319 }
320
321 if (offset == 4) {
322 sh_timer_start_stop(s->timer[0], value & (1 << 0));
323 sh_timer_start_stop(s->timer[1], value & (1 << 1));
324 if (s->feat & TMU012_FEAT_3CHAN) {
325 sh_timer_start_stop(s->timer[2], value & (1 << 2));
326 } else {
327 if (value & (1 << 2)) {
328 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad channel\n", __func__);
329 }
330 }
331
332 s->tstr = value;
333 return;
334 }
335
336 if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
337 s->tocr = value & (1 << 0);
338 }
339 }
340
341 static const MemoryRegionOps tmu012_ops = {
342 .read = tmu012_read,
343 .write = tmu012_write,
344 .endianness = DEVICE_NATIVE_ENDIAN,
345 };
346
tmu012_init(MemoryRegion * sysmem,hwaddr base,int feat,uint32_t freq,qemu_irq ch0_irq,qemu_irq ch1_irq,qemu_irq ch2_irq0,qemu_irq ch2_irq1)347 void tmu012_init(MemoryRegion *sysmem, hwaddr base, int feat, uint32_t freq,
348 qemu_irq ch0_irq, qemu_irq ch1_irq,
349 qemu_irq ch2_irq0, qemu_irq ch2_irq1)
350 {
351 tmu012_state *s;
352 int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0;
353
354 s = g_malloc0(sizeof(*s));
355 s->feat = feat;
356 s->timer[0] = sh_timer_init(freq, timer_feat, ch0_irq);
357 s->timer[1] = sh_timer_init(freq, timer_feat, ch1_irq);
358 if (feat & TMU012_FEAT_3CHAN) {
359 s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT,
360 ch2_irq0); /* ch2_irq1 not supported */
361 }
362
363 memory_region_init_io(&s->iomem, NULL, &tmu012_ops, s, "timer", 0x30);
364
365 memory_region_init_alias(&s->iomem_p4, NULL, "timer-p4",
366 &s->iomem, 0, memory_region_size(&s->iomem));
367 memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4);
368
369 memory_region_init_alias(&s->iomem_a7, NULL, "timer-a7",
370 &s->iomem, 0, memory_region_size(&s->iomem));
371 memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);
372 /* ??? Save/restore. */
373 }
374