xen/pt: allow QEMU to request MSI unmasking at bind time
[qemu.git] / hw / timer / sh_timer.c
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 "hw/hw.h"
13 #include "hw/sh4/sh.h"
14 #include "qemu/timer.h"
15 #include "qemu/main-loop.h"
16 #include "exec/address-spaces.h"
17 #include "hw/ptimer.h"
18
19 //#define DEBUG_TIMER
20
21 #define TIMER_TCR_TPSC (7 << 0)
22 #define TIMER_TCR_CKEG (3 << 3)
23 #define TIMER_TCR_UNIE (1 << 5)
24 #define TIMER_TCR_ICPE (3 << 6)
25 #define TIMER_TCR_UNF (1 << 8)
26 #define TIMER_TCR_ICPF (1 << 9)
27 #define TIMER_TCR_RESERVED (0x3f << 10)
28
29 #define TIMER_FEAT_CAPT (1 << 0)
30 #define TIMER_FEAT_EXTCLK (1 << 1)
31
32 #define OFFSET_TCOR 0
33 #define OFFSET_TCNT 1
34 #define OFFSET_TCR 2
35 #define OFFSET_TCPR 3
36
37 typedef struct {
38 ptimer_state *timer;
39 uint32_t tcnt;
40 uint32_t tcor;
41 uint32_t tcr;
42 uint32_t tcpr;
43 int freq;
44 int int_level;
45 int old_level;
46 int feat;
47 int enabled;
48 qemu_irq irq;
49 } sh_timer_state;
50
51 /* Check all active timers, and schedule the next timer interrupt. */
52
53 static void sh_timer_update(sh_timer_state *s)
54 {
55 int new_level = s->int_level && (s->tcr & TIMER_TCR_UNIE);
56
57 if (new_level != s->old_level)
58 qemu_set_irq (s->irq, new_level);
59
60 s->old_level = s->int_level;
61 s->int_level = new_level;
62 }
63
64 static uint32_t sh_timer_read(void *opaque, hwaddr offset)
65 {
66 sh_timer_state *s = (sh_timer_state *)opaque;
67
68 switch (offset >> 2) {
69 case OFFSET_TCOR:
70 return s->tcor;
71 case OFFSET_TCNT:
72 return ptimer_get_count(s->timer);
73 case OFFSET_TCR:
74 return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0);
75 case OFFSET_TCPR:
76 if (s->feat & TIMER_FEAT_CAPT)
77 return s->tcpr;
78 default:
79 hw_error("sh_timer_read: Bad offset %x\n", (int)offset);
80 return 0;
81 }
82 }
83
84 static void sh_timer_write(void *opaque, hwaddr offset,
85 uint32_t value)
86 {
87 sh_timer_state *s = (sh_timer_state *)opaque;
88 int freq;
89
90 switch (offset >> 2) {
91 case OFFSET_TCOR:
92 s->tcor = value;
93 ptimer_set_limit(s->timer, s->tcor, 0);
94 break;
95 case OFFSET_TCNT:
96 s->tcnt = value;
97 ptimer_set_count(s->timer, s->tcnt);
98 break;
99 case OFFSET_TCR:
100 if (s->enabled) {
101 /* Pause the timer if it is running. This may cause some
102 inaccuracy dure to rounding, but avoids a whole lot of other
103 messyness. */
104 ptimer_stop(s->timer);
105 }
106 freq = s->freq;
107 /* ??? Need to recalculate expiry time after changing divisor. */
108 switch (value & TIMER_TCR_TPSC) {
109 case 0: freq >>= 2; break;
110 case 1: freq >>= 4; break;
111 case 2: freq >>= 6; break;
112 case 3: freq >>= 8; break;
113 case 4: freq >>= 10; break;
114 case 6:
115 case 7: if (s->feat & TIMER_FEAT_EXTCLK) break;
116 default: hw_error("sh_timer_write: Reserved TPSC value\n"); break;
117 }
118 switch ((value & TIMER_TCR_CKEG) >> 3) {
119 case 0: break;
120 case 1:
121 case 2:
122 case 3: if (s->feat & TIMER_FEAT_EXTCLK) break;
123 default: hw_error("sh_timer_write: Reserved CKEG value\n"); break;
124 }
125 switch ((value & TIMER_TCR_ICPE) >> 6) {
126 case 0: break;
127 case 2:
128 case 3: if (s->feat & TIMER_FEAT_CAPT) break;
129 default: hw_error("sh_timer_write: Reserved ICPE value\n"); break;
130 }
131 if ((value & TIMER_TCR_UNF) == 0)
132 s->int_level = 0;
133
134 value &= ~TIMER_TCR_UNF;
135
136 if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT)))
137 hw_error("sh_timer_write: Reserved ICPF value\n");
138
139 value &= ~TIMER_TCR_ICPF; /* capture not supported */
140
141 if (value & TIMER_TCR_RESERVED)
142 hw_error("sh_timer_write: Reserved TCR bits set\n");
143 s->tcr = value;
144 ptimer_set_limit(s->timer, s->tcor, 0);
145 ptimer_set_freq(s->timer, freq);
146 if (s->enabled) {
147 /* Restart the timer if still enabled. */
148 ptimer_run(s->timer, 0);
149 }
150 break;
151 case OFFSET_TCPR:
152 if (s->feat & TIMER_FEAT_CAPT) {
153 s->tcpr = value;
154 break;
155 }
156 default:
157 hw_error("sh_timer_write: Bad offset %x\n", (int)offset);
158 }
159 sh_timer_update(s);
160 }
161
162 static void sh_timer_start_stop(void *opaque, int enable)
163 {
164 sh_timer_state *s = (sh_timer_state *)opaque;
165
166 #ifdef DEBUG_TIMER
167 printf("sh_timer_start_stop %d (%d)\n", enable, s->enabled);
168 #endif
169
170 if (s->enabled && !enable) {
171 ptimer_stop(s->timer);
172 }
173 if (!s->enabled && enable) {
174 ptimer_run(s->timer, 0);
175 }
176 s->enabled = !!enable;
177
178 #ifdef DEBUG_TIMER
179 printf("sh_timer_start_stop done %d\n", s->enabled);
180 #endif
181 }
182
183 static void sh_timer_tick(void *opaque)
184 {
185 sh_timer_state *s = (sh_timer_state *)opaque;
186 s->int_level = s->enabled;
187 sh_timer_update(s);
188 }
189
190 static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq)
191 {
192 sh_timer_state *s;
193 QEMUBH *bh;
194
195 s = (sh_timer_state *)g_malloc0(sizeof(sh_timer_state));
196 s->freq = freq;
197 s->feat = feat;
198 s->tcor = 0xffffffff;
199 s->tcnt = 0xffffffff;
200 s->tcpr = 0xdeadbeef;
201 s->tcr = 0;
202 s->enabled = 0;
203 s->irq = irq;
204
205 bh = qemu_bh_new(sh_timer_tick, s);
206 s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
207
208 sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor);
209 sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt);
210 sh_timer_write(s, OFFSET_TCPR >> 2, s->tcpr);
211 sh_timer_write(s, OFFSET_TCR >> 2, s->tcpr);
212 /* ??? Save/restore. */
213 return s;
214 }
215
216 typedef struct {
217 MemoryRegion iomem;
218 MemoryRegion iomem_p4;
219 MemoryRegion iomem_a7;
220 void *timer[3];
221 int level[3];
222 uint32_t tocr;
223 uint32_t tstr;
224 int feat;
225 } tmu012_state;
226
227 static uint64_t tmu012_read(void *opaque, hwaddr offset,
228 unsigned size)
229 {
230 tmu012_state *s = (tmu012_state *)opaque;
231
232 #ifdef DEBUG_TIMER
233 printf("tmu012_read 0x%lx\n", (unsigned long) offset);
234 #endif
235
236 if (offset >= 0x20) {
237 if (!(s->feat & TMU012_FEAT_3CHAN))
238 hw_error("tmu012_write: Bad channel offset %x\n", (int)offset);
239 return sh_timer_read(s->timer[2], offset - 0x20);
240 }
241
242 if (offset >= 0x14)
243 return sh_timer_read(s->timer[1], offset - 0x14);
244
245 if (offset >= 0x08)
246 return sh_timer_read(s->timer[0], offset - 0x08);
247
248 if (offset == 4)
249 return s->tstr;
250
251 if ((s->feat & TMU012_FEAT_TOCR) && offset == 0)
252 return s->tocr;
253
254 hw_error("tmu012_write: Bad offset %x\n", (int)offset);
255 return 0;
256 }
257
258 static void tmu012_write(void *opaque, hwaddr offset,
259 uint64_t value, unsigned size)
260 {
261 tmu012_state *s = (tmu012_state *)opaque;
262
263 #ifdef DEBUG_TIMER
264 printf("tmu012_write 0x%lx 0x%08x\n", (unsigned long) offset, value);
265 #endif
266
267 if (offset >= 0x20) {
268 if (!(s->feat & TMU012_FEAT_3CHAN))
269 hw_error("tmu012_write: Bad channel offset %x\n", (int)offset);
270 sh_timer_write(s->timer[2], offset - 0x20, value);
271 return;
272 }
273
274 if (offset >= 0x14) {
275 sh_timer_write(s->timer[1], offset - 0x14, value);
276 return;
277 }
278
279 if (offset >= 0x08) {
280 sh_timer_write(s->timer[0], offset - 0x08, value);
281 return;
282 }
283
284 if (offset == 4) {
285 sh_timer_start_stop(s->timer[0], value & (1 << 0));
286 sh_timer_start_stop(s->timer[1], value & (1 << 1));
287 if (s->feat & TMU012_FEAT_3CHAN)
288 sh_timer_start_stop(s->timer[2], value & (1 << 2));
289 else
290 if (value & (1 << 2))
291 hw_error("tmu012_write: Bad channel\n");
292
293 s->tstr = value;
294 return;
295 }
296
297 if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
298 s->tocr = value & (1 << 0);
299 }
300 }
301
302 static const MemoryRegionOps tmu012_ops = {
303 .read = tmu012_read,
304 .write = tmu012_write,
305 .endianness = DEVICE_NATIVE_ENDIAN,
306 };
307
308 void tmu012_init(MemoryRegion *sysmem, hwaddr base,
309 int feat, uint32_t freq,
310 qemu_irq ch0_irq, qemu_irq ch1_irq,
311 qemu_irq ch2_irq0, qemu_irq ch2_irq1)
312 {
313 tmu012_state *s;
314 int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0;
315
316 s = (tmu012_state *)g_malloc0(sizeof(tmu012_state));
317 s->feat = feat;
318 s->timer[0] = sh_timer_init(freq, timer_feat, ch0_irq);
319 s->timer[1] = sh_timer_init(freq, timer_feat, ch1_irq);
320 if (feat & TMU012_FEAT_3CHAN)
321 s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT,
322 ch2_irq0); /* ch2_irq1 not supported */
323
324 memory_region_init_io(&s->iomem, NULL, &tmu012_ops, s,
325 "timer", 0x100000000ULL);
326
327 memory_region_init_alias(&s->iomem_p4, NULL, "timer-p4",
328 &s->iomem, 0, 0x1000);
329 memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4);
330
331 memory_region_init_alias(&s->iomem_a7, NULL, "timer-a7",
332 &s->iomem, 0, 0x1000);
333 memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);
334 /* ??? Save/restore. */
335 }