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24#include "sysbus.h"
25#include "sysemu/sysemu.h"
26#include "qemu/timer.h"
27#include "ptimer.h"
28
29#define D(x)
30
31#define RW_TMR0_DIV 0x00
32#define R_TMR0_DATA 0x04
33#define RW_TMR0_CTRL 0x08
34#define RW_TMR1_DIV 0x10
35#define R_TMR1_DATA 0x14
36#define RW_TMR1_CTRL 0x18
37#define R_TIME 0x38
38#define RW_WD_CTRL 0x40
39#define R_WD_STAT 0x44
40#define RW_INTR_MASK 0x48
41#define RW_ACK_INTR 0x4c
42#define R_INTR 0x50
43#define R_MASKED_INTR 0x54
44
45struct etrax_timer {
46 SysBusDevice busdev;
47 MemoryRegion mmio;
48 qemu_irq irq;
49 qemu_irq nmi;
50
51 QEMUBH *bh_t0;
52 QEMUBH *bh_t1;
53 QEMUBH *bh_wd;
54 ptimer_state *ptimer_t0;
55 ptimer_state *ptimer_t1;
56 ptimer_state *ptimer_wd;
57
58 int wd_hits;
59
60
61 uint32_t rw_tmr0_div;
62 uint32_t r_tmr0_data;
63 uint32_t rw_tmr0_ctrl;
64
65 uint32_t rw_tmr1_div;
66 uint32_t r_tmr1_data;
67 uint32_t rw_tmr1_ctrl;
68
69 uint32_t rw_wd_ctrl;
70
71 uint32_t rw_intr_mask;
72 uint32_t rw_ack_intr;
73 uint32_t r_intr;
74 uint32_t r_masked_intr;
75};
76
77static uint64_t
78timer_read(void *opaque, hwaddr addr, unsigned int size)
79{
80 struct etrax_timer *t = opaque;
81 uint32_t r = 0;
82
83 switch (addr) {
84 case R_TMR0_DATA:
85 r = ptimer_get_count(t->ptimer_t0);
86 break;
87 case R_TMR1_DATA:
88 r = ptimer_get_count(t->ptimer_t1);
89 break;
90 case R_TIME:
91 r = qemu_get_clock_ns(vm_clock) / 10;
92 break;
93 case RW_INTR_MASK:
94 r = t->rw_intr_mask;
95 break;
96 case R_MASKED_INTR:
97 r = t->r_intr & t->rw_intr_mask;
98 break;
99 default:
100 D(printf ("%s %x\n", __func__, addr));
101 break;
102 }
103 return r;
104}
105
106static void update_ctrl(struct etrax_timer *t, int tnum)
107{
108 unsigned int op;
109 unsigned int freq;
110 unsigned int freq_hz;
111 unsigned int div;
112 uint32_t ctrl;
113
114 ptimer_state *timer;
115
116 if (tnum == 0) {
117 ctrl = t->rw_tmr0_ctrl;
118 div = t->rw_tmr0_div;
119 timer = t->ptimer_t0;
120 } else {
121 ctrl = t->rw_tmr1_ctrl;
122 div = t->rw_tmr1_div;
123 timer = t->ptimer_t1;
124 }
125
126
127 op = ctrl & 3;
128 freq = ctrl >> 2;
129 freq_hz = 32000000;
130
131 switch (freq)
132 {
133 case 0:
134 case 1:
135 D(printf ("extern or disabled timer clock?\n"));
136 break;
137 case 4: freq_hz = 29493000; break;
138 case 5: freq_hz = 32000000; break;
139 case 6: freq_hz = 32768000; break;
140 case 7: freq_hz = 100000000; break;
141 default:
142 abort();
143 break;
144 }
145
146 D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
147 ptimer_set_freq(timer, freq_hz);
148 ptimer_set_limit(timer, div, 0);
149
150 switch (op)
151 {
152 case 0:
153
154 ptimer_set_limit(timer, div, 1);
155 break;
156 case 1:
157
158 ptimer_stop(timer);
159 break;
160 case 2:
161
162 ptimer_run(timer, 0);
163 break;
164 default:
165 abort();
166 break;
167 }
168}
169
170static void timer_update_irq(struct etrax_timer *t)
171{
172 t->r_intr &= ~(t->rw_ack_intr);
173 t->r_masked_intr = t->r_intr & t->rw_intr_mask;
174
175 D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
176 qemu_set_irq(t->irq, !!t->r_masked_intr);
177}
178
179static void timer0_hit(void *opaque)
180{
181 struct etrax_timer *t = opaque;
182 t->r_intr |= 1;
183 timer_update_irq(t);
184}
185
186static void timer1_hit(void *opaque)
187{
188 struct etrax_timer *t = opaque;
189 t->r_intr |= 2;
190 timer_update_irq(t);
191}
192
193static void watchdog_hit(void *opaque)
194{
195 struct etrax_timer *t = opaque;
196 if (t->wd_hits == 0) {
197
198
199 ptimer_set_count(t->ptimer_wd, 10);
200 ptimer_run(t->ptimer_wd, 1);
201 qemu_irq_raise(t->nmi);
202 }
203 else
204 qemu_system_reset_request();
205
206 t->wd_hits++;
207}
208
209static inline void timer_watchdog_update(struct etrax_timer *t, uint32_t value)
210{
211 unsigned int wd_en = t->rw_wd_ctrl & (1 << 8);
212 unsigned int wd_key = t->rw_wd_ctrl >> 9;
213 unsigned int wd_cnt = t->rw_wd_ctrl & 511;
214 unsigned int new_key = value >> 9 & ((1 << 7) - 1);
215 unsigned int new_cmd = (value >> 8) & 1;
216
217
218
219 wd_key = ~wd_key & ((1 << 7) - 1);
220
221 if (wd_en && wd_key != new_key)
222 return;
223
224 D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
225 wd_en, new_key, wd_key, new_cmd, wd_cnt));
226
227 if (t->wd_hits)
228 qemu_irq_lower(t->nmi);
229
230 t->wd_hits = 0;
231
232 ptimer_set_freq(t->ptimer_wd, 760);
233 if (wd_cnt == 0)
234 wd_cnt = 256;
235 ptimer_set_count(t->ptimer_wd, wd_cnt);
236 if (new_cmd)
237 ptimer_run(t->ptimer_wd, 1);
238 else
239 ptimer_stop(t->ptimer_wd);
240
241 t->rw_wd_ctrl = value;
242}
243
244static void
245timer_write(void *opaque, hwaddr addr,
246 uint64_t val64, unsigned int size)
247{
248 struct etrax_timer *t = opaque;
249 uint32_t value = val64;
250
251 switch (addr)
252 {
253 case RW_TMR0_DIV:
254 t->rw_tmr0_div = value;
255 break;
256 case RW_TMR0_CTRL:
257 D(printf ("RW_TMR0_CTRL=%x\n", value));
258 t->rw_tmr0_ctrl = value;
259 update_ctrl(t, 0);
260 break;
261 case RW_TMR1_DIV:
262 t->rw_tmr1_div = value;
263 break;
264 case RW_TMR1_CTRL:
265 D(printf ("RW_TMR1_CTRL=%x\n", value));
266 t->rw_tmr1_ctrl = value;
267 update_ctrl(t, 1);
268 break;
269 case RW_INTR_MASK:
270 D(printf ("RW_INTR_MASK=%x\n", value));
271 t->rw_intr_mask = value;
272 timer_update_irq(t);
273 break;
274 case RW_WD_CTRL:
275 timer_watchdog_update(t, value);
276 break;
277 case RW_ACK_INTR:
278 t->rw_ack_intr = value;
279 timer_update_irq(t);
280 t->rw_ack_intr = 0;
281 break;
282 default:
283 printf ("%s " TARGET_FMT_plx " %x\n",
284 __func__, addr, value);
285 break;
286 }
287}
288
289static const MemoryRegionOps timer_ops = {
290 .read = timer_read,
291 .write = timer_write,
292 .endianness = DEVICE_LITTLE_ENDIAN,
293 .valid = {
294 .min_access_size = 4,
295 .max_access_size = 4
296 }
297};
298
299static void etraxfs_timer_reset(void *opaque)
300{
301 struct etrax_timer *t = opaque;
302
303 ptimer_stop(t->ptimer_t0);
304 ptimer_stop(t->ptimer_t1);
305 ptimer_stop(t->ptimer_wd);
306 t->rw_wd_ctrl = 0;
307 t->r_intr = 0;
308 t->rw_intr_mask = 0;
309 qemu_irq_lower(t->irq);
310}
311
312static int etraxfs_timer_init(SysBusDevice *dev)
313{
314 struct etrax_timer *t = FROM_SYSBUS(typeof (*t), dev);
315
316 t->bh_t0 = qemu_bh_new(timer0_hit, t);
317 t->bh_t1 = qemu_bh_new(timer1_hit, t);
318 t->bh_wd = qemu_bh_new(watchdog_hit, t);
319 t->ptimer_t0 = ptimer_init(t->bh_t0);
320 t->ptimer_t1 = ptimer_init(t->bh_t1);
321 t->ptimer_wd = ptimer_init(t->bh_wd);
322
323 sysbus_init_irq(dev, &t->irq);
324 sysbus_init_irq(dev, &t->nmi);
325
326 memory_region_init_io(&t->mmio, &timer_ops, t, "etraxfs-timer", 0x5c);
327 sysbus_init_mmio(dev, &t->mmio);
328 qemu_register_reset(etraxfs_timer_reset, t);
329 return 0;
330}
331
332static void etraxfs_timer_class_init(ObjectClass *klass, void *data)
333{
334 SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
335
336 sdc->init = etraxfs_timer_init;
337}
338
339static const TypeInfo etraxfs_timer_info = {
340 .name = "etraxfs,timer",
341 .parent = TYPE_SYS_BUS_DEVICE,
342 .instance_size = sizeof (struct etrax_timer),
343 .class_init = etraxfs_timer_class_init,
344};
345
346static void etraxfs_timer_register_types(void)
347{
348 type_register_static(&etraxfs_timer_info);
349}
350
351type_init(etraxfs_timer_register_types)
352
