2 * QEMU PowerMac CUDA device support
4 * Copyright (c) 2004-2007 Fabrice Bellard
5 * Copyright (c) 2007 Jocelyn Mayer
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 #include "qemu-timer.h"
30 /* XXX: implement all timer modes */
33 //#define DEBUG_CUDA_PACKET
35 /* Bits in B data register: all active low */
36 #define TREQ 0x08 /* Transfer request (input) */
37 #define TACK 0x10 /* Transfer acknowledge (output) */
38 #define TIP 0x20 /* Transfer in progress (output) */
41 #define SR_CTRL 0x1c /* Shift register control bits */
42 #define SR_EXT 0x0c /* Shift on external clock */
43 #define SR_OUT 0x10 /* Shift out if 1 */
45 /* Bits in IFR and IER */
46 #define IER_SET 0x80 /* set bits in IER */
47 #define IER_CLR 0 /* clear bits in IER */
48 #define SR_INT 0x04 /* Shift register full/empty */
49 #define T1_INT 0x40 /* Timer 1 interrupt */
50 #define T2_INT 0x20 /* Timer 2 interrupt */
53 #define T1MODE 0xc0 /* Timer 1 mode */
54 #define T1MODE_CONT 0x40 /* continuous interrupts */
56 /* commands (1st byte) */
59 #define ERROR_PACKET 2
60 #define TIMER_PACKET 3
61 #define POWER_PACKET 4
62 #define MACIIC_PACKET 5
66 /* CUDA commands (2nd byte) */
67 #define CUDA_WARM_START 0x0
68 #define CUDA_AUTOPOLL 0x1
69 #define CUDA_GET_6805_ADDR 0x2
70 #define CUDA_GET_TIME 0x3
71 #define CUDA_GET_PRAM 0x7
72 #define CUDA_SET_6805_ADDR 0x8
73 #define CUDA_SET_TIME 0x9
74 #define CUDA_POWERDOWN 0xa
75 #define CUDA_POWERUP_TIME 0xb
76 #define CUDA_SET_PRAM 0xc
77 #define CUDA_MS_RESET 0xd
78 #define CUDA_SEND_DFAC 0xe
79 #define CUDA_BATTERY_SWAP_SENSE 0x10
80 #define CUDA_RESET_SYSTEM 0x11
81 #define CUDA_SET_IPL 0x12
82 #define CUDA_FILE_SERVER_FLAG 0x13
83 #define CUDA_SET_AUTO_RATE 0x14
84 #define CUDA_GET_AUTO_RATE 0x16
85 #define CUDA_SET_DEVICE_LIST 0x19
86 #define CUDA_GET_DEVICE_LIST 0x1a
87 #define CUDA_SET_ONE_SECOND_MODE 0x1b
88 #define CUDA_SET_POWER_MESSAGES 0x21
89 #define CUDA_GET_SET_IIC 0x22
90 #define CUDA_WAKEUP 0x23
91 #define CUDA_TIMER_TICKLE 0x24
92 #define CUDA_COMBINED_FORMAT_IIC 0x25
94 #define CUDA_TIMER_FREQ (4700000 / 6)
95 #define CUDA_ADB_POLL_FREQ 50
97 /* CUDA returns time_t's offset from Jan 1, 1904, not 1970 */
98 #define RTC_OFFSET 2082844800
100 typedef struct CUDATimer {
103 uint16_t counter_value; /* counter value at load time */
105 int64_t next_irq_time;
109 typedef struct CUDAState {
111 uint8_t b; /* B-side data */
112 uint8_t a; /* A-side data */
113 uint8_t dirb; /* B-side direction (1=output) */
114 uint8_t dira; /* A-side direction (1=output) */
115 uint8_t sr; /* Shift register */
116 uint8_t acr; /* Auxiliary control register */
117 uint8_t pcr; /* Peripheral control register */
118 uint8_t ifr; /* Interrupt flag register */
119 uint8_t ier; /* Interrupt enable register */
120 uint8_t anh; /* A-side data, no handshake */
124 uint8_t last_b; /* last value of B register */
125 uint8_t last_acr; /* last value of B register */
133 uint8_t data_in[128];
134 uint8_t data_out[16];
135 QEMUTimer *adb_poll_timer;
138 static CUDAState cuda_state;
141 static void cuda_update(CUDAState *s);
142 static void cuda_receive_packet_from_host(CUDAState *s,
143 const uint8_t *data, int len);
144 static void cuda_timer_update(CUDAState *s, CUDATimer *ti,
145 int64_t current_time);
147 static void cuda_update_irq(CUDAState *s)
149 if (s->ifr & s->ier & (SR_INT | T1_INT)) {
150 qemu_irq_raise(s->irq);
152 qemu_irq_lower(s->irq);
156 static unsigned int get_counter(CUDATimer *s)
159 unsigned int counter;
161 d = muldiv64(qemu_get_clock(vm_clock) - s->load_time,
162 CUDA_TIMER_FREQ, ticks_per_sec);
164 /* the timer goes down from latch to -1 (period of latch + 2) */
165 if (d <= (s->counter_value + 1)) {
166 counter = (s->counter_value - d) & 0xffff;
168 counter = (d - (s->counter_value + 1)) % (s->latch + 2);
169 counter = (s->latch - counter) & 0xffff;
172 counter = (s->counter_value - d) & 0xffff;
177 static void set_counter(CUDAState *s, CUDATimer *ti, unsigned int val)
180 printf("cuda: T%d.counter=%d\n",
181 1 + (ti->timer == NULL), val);
183 ti->load_time = qemu_get_clock(vm_clock);
184 ti->counter_value = val;
185 cuda_timer_update(s, ti, ti->load_time);
188 static int64_t get_next_irq_time(CUDATimer *s, int64_t current_time)
190 int64_t d, next_time;
191 unsigned int counter;
193 /* current counter value */
194 d = muldiv64(current_time - s->load_time,
195 CUDA_TIMER_FREQ, ticks_per_sec);
196 /* the timer goes down from latch to -1 (period of latch + 2) */
197 if (d <= (s->counter_value + 1)) {
198 counter = (s->counter_value - d) & 0xffff;
200 counter = (d - (s->counter_value + 1)) % (s->latch + 2);
201 counter = (s->latch - counter) & 0xffff;
204 /* Note: we consider the irq is raised on 0 */
205 if (counter == 0xffff) {
206 next_time = d + s->latch + 1;
207 } else if (counter == 0) {
208 next_time = d + s->latch + 2;
210 next_time = d + counter;
214 printf("latch=%d counter=%" PRId64 " delta_next=%" PRId64 "\n",
215 s->latch, d, next_time - d);
218 next_time = muldiv64(next_time, ticks_per_sec, CUDA_TIMER_FREQ) +
220 if (next_time <= current_time)
221 next_time = current_time + 1;
225 static void cuda_timer_update(CUDAState *s, CUDATimer *ti,
226 int64_t current_time)
230 if ((s->acr & T1MODE) != T1MODE_CONT) {
231 qemu_del_timer(ti->timer);
233 ti->next_irq_time = get_next_irq_time(ti, current_time);
234 qemu_mod_timer(ti->timer, ti->next_irq_time);
238 static void cuda_timer1(void *opaque)
240 CUDAState *s = opaque;
241 CUDATimer *ti = &s->timers[0];
243 cuda_timer_update(s, ti, ti->next_irq_time);
248 static uint32_t cuda_readb(void *opaque, target_phys_addr_t addr)
250 CUDAState *s = opaque;
253 addr = (addr >> 9) & 0xf;
268 val = get_counter(&s->timers[0]) & 0xff;
273 val = get_counter(&s->timers[0]) >> 8;
277 val = s->timers[0].latch & 0xff;
280 /* XXX: check this */
281 val = (s->timers[0].latch >> 8) & 0xff;
284 val = get_counter(&s->timers[1]) & 0xff;
288 val = get_counter(&s->timers[1]) >> 8;
315 if (addr != 13 || val != 0)
316 printf("cuda: read: reg=0x%x val=%02x\n", addr, val);
321 static void cuda_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
323 CUDAState *s = opaque;
325 addr = (addr >> 9) & 0xf;
327 printf("cuda: write: reg=0x%x val=%02x\n", addr, val);
345 s->timers[0].latch = (s->timers[0].latch & 0xff00) | val;
346 cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
349 s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8);
351 set_counter(s, &s->timers[0], s->timers[0].latch);
354 s->timers[0].latch = (s->timers[0].latch & 0xff00) | val;
355 cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
358 s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8);
360 cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
363 s->timers[1].latch = val;
364 set_counter(s, &s->timers[1], val);
367 set_counter(s, &s->timers[1], (val << 8) | s->timers[1].latch);
374 cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
388 s->ier |= val & 0x7f;
402 /* NOTE: TIP and TREQ are negated */
403 static void cuda_update(CUDAState *s)
405 int packet_received, len;
409 /* transfer requested from host */
411 if (s->acr & SR_OUT) {
413 if ((s->b & (TACK | TIP)) != (s->last_b & (TACK | TIP))) {
414 if (s->data_out_index < sizeof(s->data_out)) {
416 printf("cuda: send: %02x\n", s->sr);
418 s->data_out[s->data_out_index++] = s->sr;
424 if (s->data_in_index < s->data_in_size) {
426 if ((s->b & (TACK | TIP)) != (s->last_b & (TACK | TIP))) {
427 s->sr = s->data_in[s->data_in_index++];
429 printf("cuda: recv: %02x\n", s->sr);
431 /* indicate end of transfer */
432 if (s->data_in_index >= s->data_in_size) {
433 s->b = (s->b | TREQ);
441 /* no transfer requested: handle sync case */
442 if ((s->last_b & TIP) && (s->b & TACK) != (s->last_b & TACK)) {
443 /* update TREQ state each time TACK change state */
445 s->b = (s->b | TREQ);
447 s->b = (s->b & ~TREQ);
451 if (!(s->last_b & TIP)) {
452 /* handle end of host to cuda transfer */
453 packet_received = (s->data_out_index > 0);
454 /* always an IRQ at the end of transfer */
458 /* signal if there is data to read */
459 if (s->data_in_index < s->data_in_size) {
460 s->b = (s->b & ~TREQ);
465 s->last_acr = s->acr;
468 /* NOTE: cuda_receive_packet_from_host() can call cuda_update()
470 if (packet_received) {
471 len = s->data_out_index;
472 s->data_out_index = 0;
473 cuda_receive_packet_from_host(s, s->data_out, len);
477 static void cuda_send_packet_to_host(CUDAState *s,
478 const uint8_t *data, int len)
480 #ifdef DEBUG_CUDA_PACKET
483 printf("cuda_send_packet_to_host:\n");
484 for(i = 0; i < len; i++)
485 printf(" %02x", data[i]);
489 memcpy(s->data_in, data, len);
490 s->data_in_size = len;
491 s->data_in_index = 0;
497 static void cuda_adb_poll(void *opaque)
499 CUDAState *s = opaque;
500 uint8_t obuf[ADB_MAX_OUT_LEN + 2];
503 olen = adb_poll(&adb_bus, obuf + 2);
505 obuf[0] = ADB_PACKET;
506 obuf[1] = 0x40; /* polled data */
507 cuda_send_packet_to_host(s, obuf, olen + 2);
509 qemu_mod_timer(s->adb_poll_timer,
510 qemu_get_clock(vm_clock) +
511 (ticks_per_sec / CUDA_ADB_POLL_FREQ));
514 static void cuda_receive_packet(CUDAState *s,
515 const uint8_t *data, int len)
522 autopoll = (data[1] != 0);
523 if (autopoll != s->autopoll) {
524 s->autopoll = autopoll;
526 qemu_mod_timer(s->adb_poll_timer,
527 qemu_get_clock(vm_clock) +
528 (ticks_per_sec / CUDA_ADB_POLL_FREQ));
530 qemu_del_timer(s->adb_poll_timer);
533 obuf[0] = CUDA_PACKET;
535 cuda_send_packet_to_host(s, obuf, 2);
539 /* XXX: add time support ? */
540 ti = time(NULL) + RTC_OFFSET;
541 obuf[0] = CUDA_PACKET;
548 cuda_send_packet_to_host(s, obuf, 7);
550 case CUDA_FILE_SERVER_FLAG:
551 case CUDA_SET_DEVICE_LIST:
552 case CUDA_SET_AUTO_RATE:
553 case CUDA_SET_POWER_MESSAGES:
554 obuf[0] = CUDA_PACKET;
556 cuda_send_packet_to_host(s, obuf, 2);
559 obuf[0] = CUDA_PACKET;
561 cuda_send_packet_to_host(s, obuf, 2);
562 qemu_system_shutdown_request();
564 case CUDA_RESET_SYSTEM:
565 obuf[0] = CUDA_PACKET;
567 cuda_send_packet_to_host(s, obuf, 2);
568 qemu_system_reset_request();
575 static void cuda_receive_packet_from_host(CUDAState *s,
576 const uint8_t *data, int len)
578 #ifdef DEBUG_CUDA_PACKET
581 printf("cuda_receive_packet_from_host:\n");
582 for(i = 0; i < len; i++)
583 printf(" %02x", data[i]);
590 uint8_t obuf[ADB_MAX_OUT_LEN + 2];
592 olen = adb_request(&adb_bus, obuf + 2, data + 1, len - 1);
594 obuf[0] = ADB_PACKET;
598 obuf[0] = ADB_PACKET;
602 cuda_send_packet_to_host(s, obuf, olen + 2);
606 cuda_receive_packet(s, data + 1, len - 1);
611 static void cuda_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
615 static void cuda_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
619 static uint32_t cuda_readw (void *opaque, target_phys_addr_t addr)
624 static uint32_t cuda_readl (void *opaque, target_phys_addr_t addr)
629 static CPUWriteMemoryFunc *cuda_write[] = {
635 static CPUReadMemoryFunc *cuda_read[] = {
641 void cuda_init (int *cuda_mem_index, qemu_irq irq)
643 CUDAState *s = &cuda_state;
647 s->timers[0].index = 0;
648 s->timers[0].timer = qemu_new_timer(vm_clock, cuda_timer1, s);
649 s->timers[0].latch = 0xffff;
650 set_counter(s, &s->timers[0], 0xffff);
652 s->timers[1].index = 1;
653 s->timers[1].latch = 0;
654 // s->ier = T1_INT | SR_INT;
656 set_counter(s, &s->timers[1], 0xffff);
658 s->adb_poll_timer = qemu_new_timer(vm_clock, cuda_adb_poll, s);
659 *cuda_mem_index = cpu_register_io_memory(0, cuda_read, cuda_write, s);