xref: /openbmc/qemu/hw/m68k/mcf5206.c (revision e1ecf8c8) 
1 /*
2  * Motorola ColdFire MCF5206 SoC embedded peripheral emulation.
3  *
4  * Copyright (c) 2007 CodeSourcery.
5  *
6  * This code is licensed under the GPL
7  */
8 
9 #include "qemu/osdep.h"
10 #include "qemu/error-report.h"
11 #include "qemu/main-loop.h"
12 #include "cpu.h"
13 #include "hw/hw.h"
14 #include "hw/irq.h"
15 #include "hw/m68k/mcf.h"
16 #include "qemu/timer.h"
17 #include "hw/ptimer.h"
18 #include "sysemu/sysemu.h"
19 
20 /* General purpose timer module.  */
21 typedef struct {
22     uint16_t tmr;
23     uint16_t trr;
24     uint16_t tcr;
25     uint16_t ter;
26     ptimer_state *timer;
27     qemu_irq irq;
28     int irq_state;
29 } m5206_timer_state;
30 
31 #define TMR_RST 0x01
32 #define TMR_CLK 0x06
33 #define TMR_FRR 0x08
34 #define TMR_ORI 0x10
35 #define TMR_OM  0x20
36 #define TMR_CE  0xc0
37 
38 #define TER_CAP 0x01
39 #define TER_REF 0x02
40 
41 static void m5206_timer_update(m5206_timer_state *s)
42 {
43     if ((s->tmr & TMR_ORI) != 0 && (s->ter & TER_REF))
44         qemu_irq_raise(s->irq);
45     else
46         qemu_irq_lower(s->irq);
47 }
48 
49 static void m5206_timer_reset(m5206_timer_state *s)
50 {
51     s->tmr = 0;
52     s->trr = 0;
53 }
54 
55 static void m5206_timer_recalibrate(m5206_timer_state *s)
56 {
57     int prescale;
58     int mode;
59 
60     ptimer_stop(s->timer);
61 
62     if ((s->tmr & TMR_RST) == 0)
63         return;
64 
65     prescale = (s->tmr >> 8) + 1;
66     mode = (s->tmr >> 1) & 3;
67     if (mode == 2)
68         prescale *= 16;
69 
70     if (mode == 3 || mode == 0)
71         hw_error("m5206_timer: mode %d not implemented\n", mode);
72     if ((s->tmr & TMR_FRR) == 0)
73         hw_error("m5206_timer: free running mode not implemented\n");
74 
75     /* Assume 66MHz system clock.  */
76     ptimer_set_freq(s->timer, 66000000 / prescale);
77 
78     ptimer_set_limit(s->timer, s->trr, 0);
79 
80     ptimer_run(s->timer, 0);
81 }
82 
83 static void m5206_timer_trigger(void *opaque)
84 {
85     m5206_timer_state *s = (m5206_timer_state *)opaque;
86     s->ter |= TER_REF;
87     m5206_timer_update(s);
88 }
89 
90 static uint32_t m5206_timer_read(m5206_timer_state *s, uint32_t addr)
91 {
92     switch (addr) {
93     case 0:
94         return s->tmr;
95     case 4:
96         return s->trr;
97     case 8:
98         return s->tcr;
99     case 0xc:
100         return s->trr - ptimer_get_count(s->timer);
101     case 0x11:
102         return s->ter;
103     default:
104         return 0;
105     }
106 }
107 
108 static void m5206_timer_write(m5206_timer_state *s, uint32_t addr, uint32_t val)
109 {
110     switch (addr) {
111     case 0:
112         if ((s->tmr & TMR_RST) != 0 && (val & TMR_RST) == 0) {
113             m5206_timer_reset(s);
114         }
115         s->tmr = val;
116         m5206_timer_recalibrate(s);
117         break;
118     case 4:
119         s->trr = val;
120         m5206_timer_recalibrate(s);
121         break;
122     case 8:
123         s->tcr = val;
124         break;
125     case 0xc:
126         ptimer_set_count(s->timer, val);
127         break;
128     case 0x11:
129         s->ter &= ~val;
130         break;
131     default:
132         break;
133     }
134     m5206_timer_update(s);
135 }
136 
137 static m5206_timer_state *m5206_timer_init(qemu_irq irq)
138 {
139     m5206_timer_state *s;
140     QEMUBH *bh;
141 
142     s = g_new0(m5206_timer_state, 1);
143     bh = qemu_bh_new(m5206_timer_trigger, s);
144     s->timer = ptimer_init_with_bh(bh, PTIMER_POLICY_DEFAULT);
145     s->irq = irq;
146     m5206_timer_reset(s);
147     return s;
148 }
149 
150 /* System Integration Module.  */
151 
152 typedef struct {
153     M68kCPU *cpu;
154     MemoryRegion iomem;
155     m5206_timer_state *timer[2];
156     void *uart[2];
157     uint8_t scr;
158     uint8_t icr[14];
159     uint16_t imr; /* 1 == interrupt is masked.  */
160     uint16_t ipr;
161     uint8_t rsr;
162     uint8_t swivr;
163     uint8_t par;
164     /* Include the UART vector registers here.  */
165     uint8_t uivr[2];
166 } m5206_mbar_state;
167 
168 /* Interrupt controller.  */
169 
170 static int m5206_find_pending_irq(m5206_mbar_state *s)
171 {
172     int level;
173     int vector;
174     uint16_t active;
175     int i;
176 
177     level = 0;
178     vector = 0;
179     active = s->ipr & ~s->imr;
180     if (!active)
181         return 0;
182 
183     for (i = 1; i < 14; i++) {
184         if (active & (1 << i)) {
185             if ((s->icr[i] & 0x1f) > level) {
186                 level = s->icr[i] & 0x1f;
187                 vector = i;
188             }
189         }
190     }
191 
192     if (level < 4)
193         vector = 0;
194 
195     return vector;
196 }
197 
198 static void m5206_mbar_update(m5206_mbar_state *s)
199 {
200     int irq;
201     int vector;
202     int level;
203 
204     irq = m5206_find_pending_irq(s);
205     if (irq) {
206         int tmp;
207         tmp = s->icr[irq];
208         level = (tmp >> 2) & 7;
209         if (tmp & 0x80) {
210             /* Autovector.  */
211             vector = 24 + level;
212         } else {
213             switch (irq) {
214             case 8: /* SWT */
215                 vector = s->swivr;
216                 break;
217             case 12: /* UART1 */
218                 vector = s->uivr[0];
219                 break;
220             case 13: /* UART2 */
221                 vector = s->uivr[1];
222                 break;
223             default:
224                 /* Unknown vector.  */
225                 error_report("Unhandled vector for IRQ %d", irq);
226                 vector = 0xf;
227                 break;
228             }
229         }
230     } else {
231         level = 0;
232         vector = 0;
233     }
234     m68k_set_irq_level(s->cpu, level, vector);
235 }
236 
237 static void m5206_mbar_set_irq(void *opaque, int irq, int level)
238 {
239     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
240     if (level) {
241         s->ipr |= 1 << irq;
242     } else {
243         s->ipr &= ~(1 << irq);
244     }
245     m5206_mbar_update(s);
246 }
247 
248 /* System Integration Module.  */
249 
250 static void m5206_mbar_reset(m5206_mbar_state *s)
251 {
252     s->scr = 0xc0;
253     s->icr[1] = 0x04;
254     s->icr[2] = 0x08;
255     s->icr[3] = 0x0c;
256     s->icr[4] = 0x10;
257     s->icr[5] = 0x14;
258     s->icr[6] = 0x18;
259     s->icr[7] = 0x1c;
260     s->icr[8] = 0x1c;
261     s->icr[9] = 0x80;
262     s->icr[10] = 0x80;
263     s->icr[11] = 0x80;
264     s->icr[12] = 0x00;
265     s->icr[13] = 0x00;
266     s->imr = 0x3ffe;
267     s->rsr = 0x80;
268     s->swivr = 0x0f;
269     s->par = 0;
270 }
271 
272 static uint64_t m5206_mbar_read(m5206_mbar_state *s,
273                                 uint64_t offset, unsigned size)
274 {
275     if (offset >= 0x100 && offset < 0x120) {
276         return m5206_timer_read(s->timer[0], offset - 0x100);
277     } else if (offset >= 0x120 && offset < 0x140) {
278         return m5206_timer_read(s->timer[1], offset - 0x120);
279     } else if (offset >= 0x140 && offset < 0x160) {
280         return mcf_uart_read(s->uart[0], offset - 0x140, size);
281     } else if (offset >= 0x180 && offset < 0x1a0) {
282         return mcf_uart_read(s->uart[1], offset - 0x180, size);
283     }
284     switch (offset) {
285     case 0x03: return s->scr;
286     case 0x14 ... 0x20: return s->icr[offset - 0x13];
287     case 0x36: return s->imr;
288     case 0x3a: return s->ipr;
289     case 0x40: return s->rsr;
290     case 0x41: return 0;
291     case 0x42: return s->swivr;
292     case 0x50:
293         /* DRAM mask register.  */
294         /* FIXME: currently hardcoded to 128Mb.  */
295         {
296             uint32_t mask = ~0;
297             while (mask > ram_size)
298                 mask >>= 1;
299             return mask & 0x0ffe0000;
300         }
301     case 0x5c: return 1; /* DRAM bank 1 empty.  */
302     case 0xcb: return s->par;
303     case 0x170: return s->uivr[0];
304     case 0x1b0: return s->uivr[1];
305     }
306     hw_error("Bad MBAR read offset 0x%x", (int)offset);
307     return 0;
308 }
309 
310 static void m5206_mbar_write(m5206_mbar_state *s, uint32_t offset,
311                              uint64_t value, unsigned size)
312 {
313     if (offset >= 0x100 && offset < 0x120) {
314         m5206_timer_write(s->timer[0], offset - 0x100, value);
315         return;
316     } else if (offset >= 0x120 && offset < 0x140) {
317         m5206_timer_write(s->timer[1], offset - 0x120, value);
318         return;
319     } else if (offset >= 0x140 && offset < 0x160) {
320         mcf_uart_write(s->uart[0], offset - 0x140, value, size);
321         return;
322     } else if (offset >= 0x180 && offset < 0x1a0) {
323         mcf_uart_write(s->uart[1], offset - 0x180, value, size);
324         return;
325     }
326     switch (offset) {
327     case 0x03:
328         s->scr = value;
329         break;
330     case 0x14 ... 0x20:
331         s->icr[offset - 0x13] = value;
332         m5206_mbar_update(s);
333         break;
334     case 0x36:
335         s->imr = value;
336         m5206_mbar_update(s);
337         break;
338     case 0x40:
339         s->rsr &= ~value;
340         break;
341     case 0x41:
342         /* TODO: implement watchdog.  */
343         break;
344     case 0x42:
345         s->swivr = value;
346         break;
347     case 0xcb:
348         s->par = value;
349         break;
350     case 0x170:
351         s->uivr[0] = value;
352         break;
353     case 0x178: case 0x17c: case 0x1c8: case 0x1bc:
354         /* Not implemented: UART Output port bits.  */
355         break;
356     case 0x1b0:
357         s->uivr[1] = value;
358         break;
359     default:
360         hw_error("Bad MBAR write offset 0x%x", (int)offset);
361         break;
362     }
363 }
364 
365 /* Internal peripherals use a variety of register widths.
366    This lookup table allows a single routine to handle all of them.  */
367 static const uint8_t m5206_mbar_width[] =
368 {
369   /* 000-040 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  2, 2, 2, 2,
370   /* 040-080 */ 1, 2, 2, 2,  4, 1, 2, 4,  1, 2, 4, 2,  2, 4, 2, 2,
371   /* 080-0c0 */ 4, 2, 2, 4,  2, 2, 4, 2,  2, 4, 2, 2,  4, 2, 2, 4,
372   /* 0c0-100 */ 2, 2, 1, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
373   /* 100-140 */ 2, 2, 2, 2,  1, 0, 0, 0,  2, 2, 2, 2,  1, 0, 0, 0,
374   /* 140-180 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
375   /* 180-1c0 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
376   /* 1c0-200 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
377 };
378 
379 static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset);
380 static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset);
381 
382 static uint32_t m5206_mbar_readb(void *opaque, hwaddr offset)
383 {
384     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
385     offset &= 0x3ff;
386     if (offset >= 0x200) {
387         hw_error("Bad MBAR read offset 0x%x", (int)offset);
388     }
389     if (m5206_mbar_width[offset >> 2] > 1) {
390         uint16_t val;
391         val = m5206_mbar_readw(opaque, offset & ~1);
392         if ((offset & 1) == 0) {
393             val >>= 8;
394         }
395         return val & 0xff;
396     }
397     return m5206_mbar_read(s, offset, 1);
398 }
399 
400 static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset)
401 {
402     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
403     int width;
404     offset &= 0x3ff;
405     if (offset >= 0x200) {
406         hw_error("Bad MBAR read offset 0x%x", (int)offset);
407     }
408     width = m5206_mbar_width[offset >> 2];
409     if (width > 2) {
410         uint32_t val;
411         val = m5206_mbar_readl(opaque, offset & ~3);
412         if ((offset & 3) == 0)
413             val >>= 16;
414         return val & 0xffff;
415     } else if (width < 2) {
416         uint16_t val;
417         val = m5206_mbar_readb(opaque, offset) << 8;
418         val |= m5206_mbar_readb(opaque, offset + 1);
419         return val;
420     }
421     return m5206_mbar_read(s, offset, 2);
422 }
423 
424 static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset)
425 {
426     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
427     int width;
428     offset &= 0x3ff;
429     if (offset >= 0x200) {
430         hw_error("Bad MBAR read offset 0x%x", (int)offset);
431     }
432     width = m5206_mbar_width[offset >> 2];
433     if (width < 4) {
434         uint32_t val;
435         val = m5206_mbar_readw(opaque, offset) << 16;
436         val |= m5206_mbar_readw(opaque, offset + 2);
437         return val;
438     }
439     return m5206_mbar_read(s, offset, 4);
440 }
441 
442 static void m5206_mbar_writew(void *opaque, hwaddr offset,
443                               uint32_t value);
444 static void m5206_mbar_writel(void *opaque, hwaddr offset,
445                               uint32_t value);
446 
447 static void m5206_mbar_writeb(void *opaque, hwaddr offset,
448                               uint32_t value)
449 {
450     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
451     int width;
452     offset &= 0x3ff;
453     if (offset >= 0x200) {
454         hw_error("Bad MBAR write offset 0x%x", (int)offset);
455     }
456     width = m5206_mbar_width[offset >> 2];
457     if (width > 1) {
458         uint32_t tmp;
459         tmp = m5206_mbar_readw(opaque, offset & ~1);
460         if (offset & 1) {
461             tmp = (tmp & 0xff00) | value;
462         } else {
463             tmp = (tmp & 0x00ff) | (value << 8);
464         }
465         m5206_mbar_writew(opaque, offset & ~1, tmp);
466         return;
467     }
468     m5206_mbar_write(s, offset, value, 1);
469 }
470 
471 static void m5206_mbar_writew(void *opaque, hwaddr offset,
472                               uint32_t value)
473 {
474     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
475     int width;
476     offset &= 0x3ff;
477     if (offset >= 0x200) {
478         hw_error("Bad MBAR write offset 0x%x", (int)offset);
479     }
480     width = m5206_mbar_width[offset >> 2];
481     if (width > 2) {
482         uint32_t tmp;
483         tmp = m5206_mbar_readl(opaque, offset & ~3);
484         if (offset & 3) {
485             tmp = (tmp & 0xffff0000) | value;
486         } else {
487             tmp = (tmp & 0x0000ffff) | (value << 16);
488         }
489         m5206_mbar_writel(opaque, offset & ~3, tmp);
490         return;
491     } else if (width < 2) {
492         m5206_mbar_writeb(opaque, offset, value >> 8);
493         m5206_mbar_writeb(opaque, offset + 1, value & 0xff);
494         return;
495     }
496     m5206_mbar_write(s, offset, value, 2);
497 }
498 
499 static void m5206_mbar_writel(void *opaque, hwaddr offset,
500                               uint32_t value)
501 {
502     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
503     int width;
504     offset &= 0x3ff;
505     if (offset >= 0x200) {
506         hw_error("Bad MBAR write offset 0x%x", (int)offset);
507     }
508     width = m5206_mbar_width[offset >> 2];
509     if (width < 4) {
510         m5206_mbar_writew(opaque, offset, value >> 16);
511         m5206_mbar_writew(opaque, offset + 2, value & 0xffff);
512         return;
513     }
514     m5206_mbar_write(s, offset, value, 4);
515 }
516 
517 static uint64_t m5206_mbar_readfn(void *opaque, hwaddr addr, unsigned size)
518 {
519     switch (size) {
520     case 1:
521         return m5206_mbar_readb(opaque, addr);
522     case 2:
523         return m5206_mbar_readw(opaque, addr);
524     case 4:
525         return m5206_mbar_readl(opaque, addr);
526     default:
527         g_assert_not_reached();
528     }
529 }
530 
531 static void m5206_mbar_writefn(void *opaque, hwaddr addr,
532                                uint64_t value, unsigned size)
533 {
534     switch (size) {
535     case 1:
536         m5206_mbar_writeb(opaque, addr, value);
537         break;
538     case 2:
539         m5206_mbar_writew(opaque, addr, value);
540         break;
541     case 4:
542         m5206_mbar_writel(opaque, addr, value);
543         break;
544     default:
545         g_assert_not_reached();
546     }
547 }
548 
549 static const MemoryRegionOps m5206_mbar_ops = {
550     .read = m5206_mbar_readfn,
551     .write = m5206_mbar_writefn,
552     .valid.min_access_size = 1,
553     .valid.max_access_size = 4,
554     .endianness = DEVICE_NATIVE_ENDIAN,
555 };
556 
557 qemu_irq *mcf5206_init(MemoryRegion *sysmem, uint32_t base, M68kCPU *cpu)
558 {
559     m5206_mbar_state *s;
560     qemu_irq *pic;
561 
562     s = g_new0(m5206_mbar_state, 1);
563 
564     memory_region_init_io(&s->iomem, NULL, &m5206_mbar_ops, s,
565                           "mbar", 0x00001000);
566     memory_region_add_subregion(sysmem, base, &s->iomem);
567 
568     pic = qemu_allocate_irqs(m5206_mbar_set_irq, s, 14);
569     s->timer[0] = m5206_timer_init(pic[9]);
570     s->timer[1] = m5206_timer_init(pic[10]);
571     s->uart[0] = mcf_uart_init(pic[12], serial_hd(0));
572     s->uart[1] = mcf_uart_init(pic[13], serial_hd(1));
573     s->cpu = cpu;
574 
575     m5206_mbar_reset(s);
576     return pic;
577 }
578