[qemu.git] / hw / cuda.c

/*
 * QEMU CUDA support
 * 
 * Copyright (c) 2004 Fabrice Bellard
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "vl.h"

//#define DEBUG_CUDA
//#define DEBUG_CUDA_PACKET

/* Bits in B data register: all active low */
#define TREQ		0x08		/* Transfer request (input) */
#define TACK		0x10		/* Transfer acknowledge (output) */
#define TIP		0x20		/* Transfer in progress (output) */

/* Bits in ACR */
#define SR_CTRL		0x1c		/* Shift register control bits */
#define SR_EXT		0x0c		/* Shift on external clock */
#define SR_OUT		0x10		/* Shift out if 1 */

/* Bits in IFR and IER */
#define IER_SET		0x80		/* set bits in IER */
#define IER_CLR		0		/* clear bits in IER */
#define SR_INT		0x04		/* Shift register full/empty */
#define T1_INT          0x40            /* Timer 1 interrupt */

/* Bits in ACR */
#define T1MODE          0xc0            /* Timer 1 mode */
#define T1MODE_CONT     0x40            /*  continuous interrupts */

/* commands (1st byte) */
#define ADB_PACKET	0
#define CUDA_PACKET	1
#define ERROR_PACKET	2
#define TIMER_PACKET	3
#define POWER_PACKET	4
#define MACIIC_PACKET	5
#define PMU_PACKET	6


/* CUDA commands (2nd byte) */
#define CUDA_WARM_START			0x0
#define CUDA_AUTOPOLL			0x1
#define CUDA_GET_6805_ADDR		0x2
#define CUDA_GET_TIME			0x3
#define CUDA_GET_PRAM			0x7
#define CUDA_SET_6805_ADDR		0x8
#define CUDA_SET_TIME			0x9
#define CUDA_POWERDOWN			0xa
#define CUDA_POWERUP_TIME		0xb
#define CUDA_SET_PRAM			0xc
#define CUDA_MS_RESET			0xd
#define CUDA_SEND_DFAC			0xe
#define CUDA_BATTERY_SWAP_SENSE		0x10
#define CUDA_RESET_SYSTEM		0x11
#define CUDA_SET_IPL			0x12
#define CUDA_FILE_SERVER_FLAG		0x13
#define CUDA_SET_AUTO_RATE		0x14
#define CUDA_GET_AUTO_RATE		0x16
#define CUDA_SET_DEVICE_LIST		0x19
#define CUDA_GET_DEVICE_LIST		0x1a
#define CUDA_SET_ONE_SECOND_MODE	0x1b
#define CUDA_SET_POWER_MESSAGES		0x21
#define CUDA_GET_SET_IIC		0x22
#define CUDA_WAKEUP			0x23
#define CUDA_TIMER_TICKLE		0x24
#define CUDA_COMBINED_FORMAT_IIC	0x25

#define CUDA_TIMER_FREQ (4700000 / 6)
#define CUDA_ADB_POLL_FREQ 50

/* CUDA returns time_t's offset from Jan 1, 1904, not 1970 */
#define RTC_OFFSET                      2082844800

typedef struct CUDATimer {
    unsigned int latch;
    uint16_t counter_value; /* counter value at load time */
    int64_t load_time;
    int64_t next_irq_time;
    QEMUTimer *timer;
} CUDATimer;

typedef struct CUDAState {
    /* cuda registers */
    uint8_t b;      /* B-side data */
    uint8_t a;      /* A-side data */
    uint8_t dirb;   /* B-side direction (1=output) */
    uint8_t dira;   /* A-side direction (1=output) */
    uint8_t sr;     /* Shift register */
    uint8_t acr;    /* Auxiliary control register */
    uint8_t pcr;    /* Peripheral control register */
    uint8_t ifr;    /* Interrupt flag register */
    uint8_t ier;    /* Interrupt enable register */
    uint8_t anh;    /* A-side data, no handshake */

    CUDATimer timers[2];
    
    uint8_t last_b; /* last value of B register */
    uint8_t last_acr; /* last value of B register */
    
    int data_in_size;
    int data_in_index;
    int data_out_index;

    int irq;
    openpic_t *openpic;
    uint8_t autopoll;
    uint8_t data_in[128];
    uint8_t data_out[16];
    QEMUTimer *adb_poll_timer;
} CUDAState;

static CUDAState cuda_state;
ADBBusState adb_bus;

static void cuda_update(CUDAState *s);
static void cuda_receive_packet_from_host(CUDAState *s, 
                                          const uint8_t *data, int len);
static void cuda_timer_update(CUDAState *s, CUDATimer *ti, 
                              int64_t current_time);

static void cuda_update_irq(CUDAState *s)
{
    if (s->ifr & s->ier & (SR_INT | T1_INT)) {
        openpic_set_irq(s->openpic, s->irq, 1);
    } else {
        openpic_set_irq(s->openpic, s->irq, 0);
    }
}

static unsigned int get_counter(CUDATimer *s)
{
    int64_t d;
    unsigned int counter;

    d = muldiv64(qemu_get_clock(vm_clock) - s->load_time, 
                 CUDA_TIMER_FREQ, ticks_per_sec);
    if (d <= s->counter_value) {
        counter = d;
    } else {
        counter = s->latch - 1 - ((d - s->counter_value) % s->latch);
    }
    return counter;
}

static void set_counter(CUDAState *s, CUDATimer *ti, unsigned int val)
{
#ifdef DEBUG_CUDA
    printf("cuda: T%d.counter=%d\n",
           1 + (ti->timer == NULL), val);
#endif
    ti->load_time = qemu_get_clock(vm_clock);
    ti->counter_value = val;
    cuda_timer_update(s, ti, ti->load_time);
}

static int64_t get_next_irq_time(CUDATimer *s, int64_t current_time)
{
    int64_t d, next_time, base;
    /* current counter value */
    d = muldiv64(current_time - s->load_time, 
                 CUDA_TIMER_FREQ, ticks_per_sec);
    if (d < s->counter_value) {
        next_time = s->counter_value + 1;
    } else
    {
        base = ((d - s->counter_value + 1) / s->latch);
        base = (base * s->latch) + s->counter_value;
        next_time = base + s->latch;
    }
#if 0
#ifdef DEBUG_CUDA
    printf("latch=%d counter=%lld delta_next=%lld\n", 
           s->latch, d, next_time - d);
#endif
#endif
    next_time = muldiv64(next_time, ticks_per_sec, CUDA_TIMER_FREQ) + 
        s->load_time;
    if (next_time <= current_time)
        next_time = current_time + 1;
    return next_time;
}

static void cuda_timer_update(CUDAState *s, CUDATimer *ti, 
                              int64_t current_time)
{
    if (!ti->timer)
        return;
    if ((s->acr & T1MODE) != T1MODE_CONT) {
        qemu_del_timer(ti->timer);
    } else {
        ti->next_irq_time = get_next_irq_time(ti, current_time);
        qemu_mod_timer(ti->timer, ti->next_irq_time);
    }
}

static void cuda_timer1(void *opaque)
{
    CUDAState *s = opaque;
    CUDATimer *ti = &s->timers[0];

    cuda_timer_update(s, ti, ti->next_irq_time);
    s->ifr |= T1_INT;
    cuda_update_irq(s);
}

static uint32_t cuda_readb(void *opaque, target_phys_addr_t addr)
{
    CUDAState *s = opaque;
    uint32_t val;

    addr = (addr >> 9) & 0xf;
    switch(addr) {
    case 0:
        val = s->b;
        break;
    case 1:
        val = s->a;
        break;
    case 2:
        val = s->dirb;
        break;
    case 3:
        val = s->dira;
        break;
    case 4:
        val = get_counter(&s->timers[0]) & 0xff;
        s->ifr &= ~T1_INT;
        cuda_update_irq(s);
        break;
    case 5:
        val = get_counter(&s->timers[0]) >> 8;
        s->ifr &= ~T1_INT;
        cuda_update_irq(s);
        break;
    case 6:
        val = s->timers[0].latch & 0xff;
        break;
    case 7:
        val = (s->timers[0].latch >> 8) & 0xff;
        break;
    case 8:
        val = get_counter(&s->timers[1]) & 0xff;
        break;
    case 9:
        val = get_counter(&s->timers[1]) >> 8;
        break;
    case 10:
        val = s->sr;
        s->ifr &= ~SR_INT;
        cuda_update_irq(s);
        break;
    case 11:
        val = s->acr;
        break;
    case 12:
        val = s->pcr;
        break;
    case 13:
        val = s->ifr;
        break;
    case 14:
        val = s->ier;
        break;
    default:
    case 15:
        val = s->anh;
        break;
    }
#ifdef DEBUG_CUDA
    if (addr != 13 || val != 0)
        printf("cuda: read: reg=0x%x val=%02x\n", addr, val);
#endif
    return val;
}

static void cuda_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
{
    CUDAState *s = opaque;
    
    addr = (addr >> 9) & 0xf;
#ifdef DEBUG_CUDA
    printf("cuda: write: reg=0x%x val=%02x\n", addr, val);
#endif

    switch(addr) {
    case 0:
        s->b = val;
        cuda_update(s);
        break;
    case 1:
        s->a = val;
        break;
    case 2:
        s->dirb = val;
        break;
    case 3:
        s->dira = val;
        break;
    case 4:
        val = val | (get_counter(&s->timers[0]) & 0xff00);
        set_counter(s, &s->timers[0], val);
        break;
    case 5:
        val = (val << 8) |  (get_counter(&s->timers[0]) & 0xff);
        set_counter(s, &s->timers[0], val);
        break;
    case 6:
        s->timers[0].latch = (s->timers[0].latch & 0xff00) | val;
        cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
        break;
    case 7:
        s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8);
        cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
        break;
    case 8:
        val = val | (get_counter(&s->timers[1]) & 0xff00);
        set_counter(s, &s->timers[1], val);
        break;
    case 9:
        val = (val << 8) |  (get_counter(&s->timers[1]) & 0xff);
        set_counter(s, &s->timers[1], val);
        break;
    case 10:
        s->sr = val;
        break;
    case 11:
        s->acr = val;
        cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
        cuda_update(s);
        break;
    case 12:
        s->pcr = val;
        break;
    case 13:
        /* reset bits */
        s->ifr &= ~val;
        cuda_update_irq(s);
        break;
    case 14:
        if (val & IER_SET) {
            /* set bits */
            s->ier |= val & 0x7f;
        } else {
            /* reset bits */
            s->ier &= ~val;
        }
        cuda_update_irq(s);
        break;
    default:
    case 15:
        s->anh = val;
        break;
    }
}

/* NOTE: TIP and TREQ are negated */
static void cuda_update(CUDAState *s)
{
    int packet_received, len;

    packet_received = 0;
    if (!(s->b & TIP)) {
        /* transfer requested from host */

        if (s->acr & SR_OUT) {
            /* data output */
            if ((s->b & (TACK | TIP)) != (s->last_b & (TACK | TIP))) {
                if (s->data_out_index < sizeof(s->data_out)) {
#ifdef DEBUG_CUDA
                    printf("cuda: send: %02x\n", s->sr);
#endif
                    s->data_out[s->data_out_index++] = s->sr;
                    s->ifr |= SR_INT;
                    cuda_update_irq(s);
                }
            }
        } else {
            if (s->data_in_index < s->data_in_size) {
                /* data input */
                if ((s->b & (TACK | TIP)) != (s->last_b & (TACK | TIP))) {
                    s->sr = s->data_in[s->data_in_index++];
#ifdef DEBUG_CUDA
                    printf("cuda: recv: %02x\n", s->sr);
#endif
                    /* indicate end of transfer */
                    if (s->data_in_index >= s->data_in_size) {
                        s->b = (s->b | TREQ);
                    }
                    s->ifr |= SR_INT;
                    cuda_update_irq(s);
                }
            }
        }
    } else {
        /* no transfer requested: handle sync case */
        if ((s->last_b & TIP) && (s->b & TACK) != (s->last_b & TACK)) {
            /* update TREQ state each time TACK change state */
            if (s->b & TACK)
                s->b = (s->b | TREQ);
            else
                s->b = (s->b & ~TREQ);
            s->ifr |= SR_INT;
            cuda_update_irq(s);
        } else {
            if (!(s->last_b & TIP)) {
                /* handle end of host to cuda transfert */
                packet_received = (s->data_out_index > 0);
                /* always an IRQ at the end of transfert */
                s->ifr |= SR_INT;
                cuda_update_irq(s);
            }
            /* signal if there is data to read */
            if (s->data_in_index < s->data_in_size) {
                s->b = (s->b & ~TREQ);
            }
        }
    }

    s->last_acr = s->acr;
    s->last_b = s->b;

    /* NOTE: cuda_receive_packet_from_host() can call cuda_update()
       recursively */
    if (packet_received) {
        len = s->data_out_index;
        s->data_out_index = 0;
        cuda_receive_packet_from_host(s, s->data_out, len);
    }
}

static void cuda_send_packet_to_host(CUDAState *s, 
                                     const uint8_t *data, int len)
{
#ifdef DEBUG_CUDA_PACKET
    {
        int i;
        printf("cuda_send_packet_to_host:\n");
        for(i = 0; i < len; i++)
            printf(" %02x", data[i]);
        printf("\n");
    }
#endif
    memcpy(s->data_in, data, len);
    s->data_in_size = len;
    s->data_in_index = 0;
    cuda_update(s);
    s->ifr |= SR_INT;
    cuda_update_irq(s);
}

static void cuda_adb_poll(void *opaque)
{
    CUDAState *s = opaque;
    uint8_t obuf[ADB_MAX_OUT_LEN + 2];
    int olen;

    olen = adb_poll(&adb_bus, obuf + 2);
    if (olen > 0) {
        obuf[0] = ADB_PACKET;
        obuf[1] = 0x40; /* polled data */
        cuda_send_packet_to_host(s, obuf, olen + 2);
    }
    qemu_mod_timer(s->adb_poll_timer, 
                   qemu_get_clock(vm_clock) + 
                   (ticks_per_sec / CUDA_ADB_POLL_FREQ));
}

static void cuda_receive_packet(CUDAState *s, 
                                const uint8_t *data, int len)
{
    uint8_t obuf[16];
    int ti, autopoll;

    switch(data[0]) {
    case CUDA_AUTOPOLL:
        autopoll = (data[1] != 0);
        if (autopoll != s->autopoll) {
            s->autopoll = autopoll;
            if (autopoll) {
                qemu_mod_timer(s->adb_poll_timer, 
                               qemu_get_clock(vm_clock) + 
                               (ticks_per_sec / CUDA_ADB_POLL_FREQ));
            } else {
                qemu_del_timer(s->adb_poll_timer);
            }
        }
        obuf[0] = CUDA_PACKET;
        obuf[1] = data[1];
        cuda_send_packet_to_host(s, obuf, 2);
        break;
    case CUDA_GET_TIME:
    case CUDA_SET_TIME:
        /* XXX: add time support ? */
        ti = time(NULL) + RTC_OFFSET;
        obuf[0] = CUDA_PACKET;
        obuf[1] = 0;
        obuf[2] = 0;
        obuf[3] = ti >> 24;
        obuf[4] = ti >> 16;
        obuf[5] = ti >> 8;
        obuf[6] = ti;
        cuda_send_packet_to_host(s, obuf, 7);
        break;
    case CUDA_FILE_SERVER_FLAG:
    case CUDA_SET_DEVICE_LIST:
    case CUDA_SET_AUTO_RATE:
    case CUDA_SET_POWER_MESSAGES:
        obuf[0] = CUDA_PACKET;
        obuf[1] = 0;
        cuda_send_packet_to_host(s, obuf, 2);
        break;
    case CUDA_POWERDOWN:
        obuf[0] = CUDA_PACKET;
        obuf[1] = 0;
        cuda_send_packet_to_host(s, obuf, 2);
	qemu_system_shutdown_request();
	break;
    default:
        break;
    }
}

static void cuda_receive_packet_from_host(CUDAState *s, 
                                          const uint8_t *data, int len)
{
#ifdef DEBUG_CUDA_PACKET
    {
        int i;
        printf("cuda_receive_packet_to_host:\n");
        for(i = 0; i < len; i++)
            printf(" %02x", data[i]);
        printf("\n");
    }
#endif
    switch(data[0]) {
    case ADB_PACKET:
        {
            uint8_t obuf[ADB_MAX_OUT_LEN + 2];
            int olen;
            olen = adb_request(&adb_bus, obuf + 2, data + 1, len - 1);
            if (olen > 0) {
                obuf[0] = ADB_PACKET;
                obuf[1] = 0x00;
            } else {
                /* error */
                obuf[0] = ADB_PACKET;
                obuf[1] = -olen;
                olen = 0;
            }
            cuda_send_packet_to_host(s, obuf, olen + 2);
        }
        break;
    case CUDA_PACKET:
        cuda_receive_packet(s, data + 1, len - 1);
        break;
    }
}

static void cuda_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
{
}

static void cuda_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
}

static uint32_t cuda_readw (void *opaque, target_phys_addr_t addr)
{
    return 0;
}

static uint32_t cuda_readl (void *opaque, target_phys_addr_t addr)
{
    return 0;
}

static CPUWriteMemoryFunc *cuda_write[] = {
    &cuda_writeb,
    &cuda_writew,
    &cuda_writel,
};

static CPUReadMemoryFunc *cuda_read[] = {
    &cuda_readb,
    &cuda_readw,
    &cuda_readl,
};

int cuda_init(openpic_t *openpic, int irq)
{
    CUDAState *s = &cuda_state;
    int cuda_mem_index;

    s->openpic = openpic;
    s->irq = irq;

    s->timers[0].timer = qemu_new_timer(vm_clock, cuda_timer1, s);
    s->timers[0].latch = 0x10000;
    set_counter(s, &s->timers[0], 0xffff);
    s->timers[1].latch = 0x10000;
    s->ier = T1_INT | SR_INT;
    set_counter(s, &s->timers[1], 0xffff);

    s->adb_poll_timer = qemu_new_timer(vm_clock, cuda_adb_poll, s);
    cuda_mem_index = cpu_register_io_memory(0, cuda_read, cuda_write, s);
    return cuda_mem_index;
}
Commit	Line	Data
267002cd FB	1	/*
	2	* QEMU CUDA support
	3	*
	4	* Copyright (c) 2004 Fabrice Bellard
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24	#include "vl.h"
	25
819e712b FB	26	//#define DEBUG_CUDA
	27	//#define DEBUG_CUDA_PACKET
	28
267002cd FB	29	/* Bits in B data register: all active low */
	30	#define TREQ 0x08 /* Transfer request (input) */
	31	#define TACK 0x10 /* Transfer acknowledge (output) */
	32	#define TIP 0x20 /* Transfer in progress (output) */
	33
	34	/* Bits in ACR */
	35	#define SR_CTRL 0x1c /* Shift register control bits */
	36	#define SR_EXT 0x0c /* Shift on external clock */
	37	#define SR_OUT 0x10 /* Shift out if 1 */
	38
	39	/* Bits in IFR and IER */
	40	#define IER_SET 0x80 /* set bits in IER */
	41	#define IER_CLR 0 /* clear bits in IER */
	42	#define SR_INT 0x04 /* Shift register full/empty */
	43	#define T1_INT 0x40 /* Timer 1 interrupt */
	44
	45	/* Bits in ACR */
	46	#define T1MODE 0xc0 /* Timer 1 mode */
	47	#define T1MODE_CONT 0x40 /* continuous interrupts */
	48
	49	/* commands (1st byte) */
	50	#define ADB_PACKET 0
	51	#define CUDA_PACKET 1
	52	#define ERROR_PACKET 2
	53	#define TIMER_PACKET 3
	54	#define POWER_PACKET 4
	55	#define MACIIC_PACKET 5
	56	#define PMU_PACKET 6
	57
	58
	59	/* CUDA commands (2nd byte) */
	60	#define CUDA_WARM_START 0x0
	61	#define CUDA_AUTOPOLL 0x1
	62	#define CUDA_GET_6805_ADDR 0x2
	63	#define CUDA_GET_TIME 0x3
	64	#define CUDA_GET_PRAM 0x7
	65	#define CUDA_SET_6805_ADDR 0x8
	66	#define CUDA_SET_TIME 0x9
	67	#define CUDA_POWERDOWN 0xa
	68	#define CUDA_POWERUP_TIME 0xb
	69	#define CUDA_SET_PRAM 0xc
	70	#define CUDA_MS_RESET 0xd
	71	#define CUDA_SEND_DFAC 0xe
	72	#define CUDA_BATTERY_SWAP_SENSE 0x10
	73	#define CUDA_RESET_SYSTEM 0x11
	74	#define CUDA_SET_IPL 0x12
	75	#define CUDA_FILE_SERVER_FLAG 0x13
	76	#define CUDA_SET_AUTO_RATE 0x14
	77	#define CUDA_GET_AUTO_RATE 0x16
	78	#define CUDA_SET_DEVICE_LIST 0x19
	79	#define CUDA_GET_DEVICE_LIST 0x1a
	80	#define CUDA_SET_ONE_SECOND_MODE 0x1b
	81	#define CUDA_SET_POWER_MESSAGES 0x21
	82	#define CUDA_GET_SET_IIC 0x22
	83	#define CUDA_WAKEUP 0x23
	84	#define CUDA_TIMER_TICKLE 0x24
	85	#define CUDA_COMBINED_FORMAT_IIC 0x25
	86
	87	#define CUDA_TIMER_FREQ (4700000 / 6)
e2733d20	88	#define CUDA_ADB_POLL_FREQ 50
267002cd	89
d7ce296f FB	90	/* CUDA returns time_t's offset from Jan 1, 1904, not 1970 */
	91	#define RTC_OFFSET 2082844800
	92
267002cd FB	93	typedef struct CUDATimer {
	94	unsigned int latch;
	95	uint16_t counter_value; /* counter value at load time */
	96	int64_t load_time;
	97	int64_t next_irq_time;
	98	QEMUTimer *timer;
	99	} CUDATimer;
	100
	101	typedef struct CUDAState {
	102	/* cuda registers */
	103	uint8_t b; /* B-side data */
	104	uint8_t a; /* A-side data */
	105	uint8_t dirb; /* B-side direction (1=output) */
	106	uint8_t dira; /* A-side direction (1=output) */
	107	uint8_t sr; /* Shift register */
	108	uint8_t acr; /* Auxiliary control register */
	109	uint8_t pcr; /* Peripheral control register */
	110	uint8_t ifr; /* Interrupt flag register */
	111	uint8_t ier; /* Interrupt enable register */
	112	uint8_t anh; /* A-side data, no handshake */
	113
	114	CUDATimer timers[2];
	115
	116	uint8_t last_b; /* last value of B register */
	117	uint8_t last_acr; /* last value of B register */
	118
	119	int data_in_size;
	120	int data_in_index;
	121	int data_out_index;
	122
	123	int irq;
819e712b	124	openpic_t *openpic;
267002cd FB	125	uint8_t autopoll;
	126	uint8_t data_in[128];
	127	uint8_t data_out[16];
e2733d20	128	QEMUTimer *adb_poll_timer;
267002cd FB	129	} CUDAState;
	130
	131	static CUDAState cuda_state;
	132	ADBBusState adb_bus;
	133
	134	static void cuda_update(CUDAState *s);
	135	static void cuda_receive_packet_from_host(CUDAState *s,
	136	const uint8_t *data, int len);
819e712b FB	137	static void cuda_timer_update(CUDAState s, CUDATimer ti,
819e712b FB	138	int64_t current_time);
267002cd FB	139
	140	static void cuda_update_irq(CUDAState *s)
	141	{
819e712b FB	142	if (s->ifr & s->ier & (SR_INT \| T1_INT)) {
819e712b FB	143	openpic_set_irq(s->openpic, s->irq, 1);
267002cd	144	} else {
819e712b	145	openpic_set_irq(s->openpic, s->irq, 0);
267002cd FB	146	}
	147	}
	148
	149	static unsigned int get_counter(CUDATimer *s)
	150	{
	151	int64_t d;
	152	unsigned int counter;
	153
	154	d = muldiv64(qemu_get_clock(vm_clock) - s->load_time,
	155	CUDA_TIMER_FREQ, ticks_per_sec);
	156	if (d <= s->counter_value) {
	157	counter = d;
	158	} else {
	159	counter = s->latch - 1 - ((d - s->counter_value) % s->latch);
	160	}
	161	return counter;
	162	}
	163
819e712b	164	static void set_counter(CUDAState s, CUDATimer ti, unsigned int val)
267002cd	165	{
819e712b FB	166	#ifdef DEBUG_CUDA
	167	printf("cuda: T%d.counter=%d\n",
	168	1 + (ti->timer == NULL), val);
	169	#endif
	170	ti->load_time = qemu_get_clock(vm_clock);
	171	ti->counter_value = val;
	172	cuda_timer_update(s, ti, ti->load_time);
267002cd FB	173	}
	174
	175	static int64_t get_next_irq_time(CUDATimer *s, int64_t current_time)
	176	{
	177	int64_t d, next_time, base;
	178	/* current counter value */
	179	d = muldiv64(current_time - s->load_time,
	180	CUDA_TIMER_FREQ, ticks_per_sec);
dccfafc4	181	if (d < s->counter_value) {
267002cd	182	next_time = s->counter_value + 1;
dccfafc4 FB	183	} else
	184	{
	185	base = ((d - s->counter_value + 1) / s->latch);
267002cd FB	186	base = (base * s->latch) + s->counter_value;
	187	next_time = base + s->latch;
	188	}
dccfafc4	189	#if 0
819e712b FB	190	#ifdef DEBUG_CUDA
	191	printf("latch=%d counter=%lld delta_next=%lld\n",
	192	s->latch, d, next_time - d);
dccfafc4	193	#endif
819e712b	194	#endif
267002cd FB	195	next_time = muldiv64(next_time, ticks_per_sec, CUDA_TIMER_FREQ) +
	196	s->load_time;
	197	if (next_time <= current_time)
	198	next_time = current_time + 1;
	199	return next_time;
	200	}
	201
819e712b FB	202	static void cuda_timer_update(CUDAState s, CUDATimer ti,
	203	int64_t current_time)
	204	{
	205	if (!ti->timer)
	206	return;
	207	if ((s->acr & T1MODE) != T1MODE_CONT) {
	208	qemu_del_timer(ti->timer);
	209	} else {
	210	ti->next_irq_time = get_next_irq_time(ti, current_time);
	211	qemu_mod_timer(ti->timer, ti->next_irq_time);
	212	}
	213	}
	214
267002cd FB	215	static void cuda_timer1(void *opaque)
	216	{
	217	CUDAState *s = opaque;
	218	CUDATimer *ti = &s->timers[0];
	219
819e712b	220	cuda_timer_update(s, ti, ti->next_irq_time);
267002cd FB	221	s->ifr \|= T1_INT;
	222	cuda_update_irq(s);
	223	}
	224
	225	static uint32_t cuda_readb(void *opaque, target_phys_addr_t addr)
	226	{
	227	CUDAState *s = opaque;
	228	uint32_t val;
	229
	230	addr = (addr >> 9) & 0xf;
	231	switch(addr) {
	232	case 0:
	233	val = s->b;
	234	break;
	235	case 1:
	236	val = s->a;
	237	break;
	238	case 2:
	239	val = s->dirb;
	240	break;
	241	case 3:
	242	val = s->dira;
	243	break;
	244	case 4:
	245	val = get_counter(&s->timers[0]) & 0xff;
	246	s->ifr &= ~T1_INT;
	247	cuda_update_irq(s);
	248	break;
	249	case 5:
	250	val = get_counter(&s->timers[0]) >> 8;
	251	s->ifr &= ~T1_INT;
	252	cuda_update_irq(s);
	253	break;
	254	case 6:
	255	val = s->timers[0].latch & 0xff;
	256	break;
	257	case 7:
	258	val = (s->timers[0].latch >> 8) & 0xff;
	259	break;
	260	case 8:
	261	val = get_counter(&s->timers[1]) & 0xff;
	262	break;
	263	case 9:
	264	val = get_counter(&s->timers[1]) >> 8;
	265	break;
	266	case 10:
819e712b FB	267	val = s->sr;
	268	s->ifr &= ~SR_INT;
	269	cuda_update_irq(s);
267002cd FB	270	break;
	271	case 11:
	272	val = s->acr;
	273	break;
	274	case 12:
	275	val = s->pcr;
	276	break;
	277	case 13:
	278	val = s->ifr;
	279	break;
	280	case 14:
	281	val = s->ier;
	282	break;
	283	default:
	284	case 15:
	285	val = s->anh;
	286	break;
	287	}
	288	#ifdef DEBUG_CUDA
819e712b FB	289	if (addr != 13 \|\| val != 0)
819e712b FB	290	printf("cuda: read: reg=0x%x val=%02x\n", addr, val);
267002cd FB	291	#endif
	292	return val;
	293	}
	294
	295	static void cuda_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
	296	{
	297	CUDAState *s = opaque;
	298
	299	addr = (addr >> 9) & 0xf;
	300	#ifdef DEBUG_CUDA
	301	printf("cuda: write: reg=0x%x val=%02x\n", addr, val);
	302	#endif
	303
	304	switch(addr) {
	305	case 0:
	306	s->b = val;
	307	cuda_update(s);
	308	break;
	309	case 1:
	310	s->a = val;
	311	break;
	312	case 2:
	313	s->dirb = val;
	314	break;
	315	case 3:
	316	s->dira = val;
	317	break;
	318	case 4:
	319	val = val \| (get_counter(&s->timers[0]) & 0xff00);
819e712b	320	set_counter(s, &s->timers[0], val);
267002cd FB	321	break;
	322	case 5:
	323	val = (val << 8) \| (get_counter(&s->timers[0]) & 0xff);
819e712b	324	set_counter(s, &s->timers[0], val);
267002cd FB	325	break;
	326	case 6:
	327	s->timers[0].latch = (s->timers[0].latch & 0xff00) \| val;
819e712b	328	cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
267002cd FB	329	break;
	330	case 7:
	331	s->timers[0].latch = (s->timers[0].latch & 0xff) \| (val << 8);
819e712b	332	cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
267002cd FB	333	break;
	334	case 8:
	335	val = val \| (get_counter(&s->timers[1]) & 0xff00);
819e712b	336	set_counter(s, &s->timers[1], val);
267002cd FB	337	break;
	338	case 9:
	339	val = (val << 8) \| (get_counter(&s->timers[1]) & 0xff);
819e712b	340	set_counter(s, &s->timers[1], val);
267002cd FB	341	break;
	342	case 10:
	343	s->sr = val;
	344	break;
	345	case 11:
	346	s->acr = val;
819e712b	347	cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
267002cd FB	348	cuda_update(s);
	349	break;
	350	case 12:
	351	s->pcr = val;
	352	break;
	353	case 13:
	354	/* reset bits */
	355	s->ifr &= ~val;
	356	cuda_update_irq(s);
	357	break;
	358	case 14:
	359	if (val & IER_SET) {
	360	/* set bits */
	361	s->ier \|= val & 0x7f;
	362	} else {
	363	/* reset bits */
	364	s->ier &= ~val;
	365	}
	366	cuda_update_irq(s);
	367	break;
	368	default:
	369	case 15:
	370	s->anh = val;
	371	break;
	372	}
	373	}
	374
	375	/* NOTE: TIP and TREQ are negated */
	376	static void cuda_update(CUDAState *s)
	377	{
819e712b FB	378	int packet_received, len;
	379
	380	packet_received = 0;
	381	if (!(s->b & TIP)) {
	382	/* transfer requested from host */
267002cd	383
819e712b FB	384	if (s->acr & SR_OUT) {
	385	/* data output */
	386	if ((s->b & (TACK \| TIP)) != (s->last_b & (TACK \| TIP))) {
	387	if (s->data_out_index < sizeof(s->data_out)) {
	388	#ifdef DEBUG_CUDA
	389	printf("cuda: send: %02x\n", s->sr);
	390	#endif
	391	s->data_out[s->data_out_index++] = s->sr;
	392	s->ifr \|= SR_INT;
	393	cuda_update_irq(s);
	394	}
	395	}
	396	} else {
	397	if (s->data_in_index < s->data_in_size) {
	398	/* data input */
	399	if ((s->b & (TACK \| TIP)) != (s->last_b & (TACK \| TIP))) {
	400	s->sr = s->data_in[s->data_in_index++];
	401	#ifdef DEBUG_CUDA
	402	printf("cuda: recv: %02x\n", s->sr);
	403	#endif
	404	/* indicate end of transfer */
	405	if (s->data_in_index >= s->data_in_size) {
	406	s->b = (s->b \| TREQ);
	407	}
	408	s->ifr \|= SR_INT;
	409	cuda_update_irq(s);
	410	}
267002cd	411	}
819e712b FB	412	}
	413	} else {
	414	/* no transfer requested: handle sync case */
	415	if ((s->last_b & TIP) && (s->b & TACK) != (s->last_b & TACK)) {
	416	/* update TREQ state each time TACK change state */
	417	if (s->b & TACK)
	418	s->b = (s->b \| TREQ);
	419	else
	420	s->b = (s->b & ~TREQ);
267002cd FB	421	s->ifr \|= SR_INT;
267002cd FB	422	cuda_update_irq(s);
819e712b FB	423	} else {
	424	if (!(s->last_b & TIP)) {
	425	/* handle end of host to cuda transfert */
	426	packet_received = (s->data_out_index > 0);
	427	/* always an IRQ at the end of transfert */
	428	s->ifr \|= SR_INT;
	429	cuda_update_irq(s);
	430	}
	431	/* signal if there is data to read */
	432	if (s->data_in_index < s->data_in_size) {
	433	s->b = (s->b & ~TREQ);
	434	}
267002cd FB	435	}
	436	}
	437
267002cd FB	438	s->last_acr = s->acr;
267002cd FB	439	s->last_b = s->b;
819e712b FB	440
	441	/* NOTE: cuda_receive_packet_from_host() can call cuda_update()
	442	recursively */
	443	if (packet_received) {
	444	len = s->data_out_index;
	445	s->data_out_index = 0;
	446	cuda_receive_packet_from_host(s, s->data_out, len);
	447	}
267002cd FB	448	}
	449
	450	static void cuda_send_packet_to_host(CUDAState *s,
	451	const uint8_t *data, int len)
	452	{
819e712b FB	453	#ifdef DEBUG_CUDA_PACKET
	454	{
	455	int i;
	456	printf("cuda_send_packet_to_host:\n");
	457	for(i = 0; i < len; i++)
	458	printf(" %02x", data[i]);
	459	printf("\n");
	460	}
	461	#endif
267002cd FB	462	memcpy(s->data_in, data, len);
	463	s->data_in_size = len;
	464	s->data_in_index = 0;
	465	cuda_update(s);
	466	s->ifr \|= SR_INT;
	467	cuda_update_irq(s);
	468	}
	469
7db4eea6	470	static void cuda_adb_poll(void *opaque)
e2733d20 FB	471	{
	472	CUDAState *s = opaque;
	473	uint8_t obuf[ADB_MAX_OUT_LEN + 2];
	474	int olen;
	475
	476	olen = adb_poll(&adb_bus, obuf + 2);
	477	if (olen > 0) {
	478	obuf[0] = ADB_PACKET;
	479	obuf[1] = 0x40; /* polled data */
	480	cuda_send_packet_to_host(s, obuf, olen + 2);
	481	}
	482	qemu_mod_timer(s->adb_poll_timer,
	483	qemu_get_clock(vm_clock) +
	484	(ticks_per_sec / CUDA_ADB_POLL_FREQ));
	485	}
	486
267002cd FB	487	static void cuda_receive_packet(CUDAState *s,
	488	const uint8_t *data, int len)
	489	{
	490	uint8_t obuf[16];
e2733d20	491	int ti, autopoll;
267002cd FB	492
	493	switch(data[0]) {
	494	case CUDA_AUTOPOLL:
e2733d20 FB	495	autopoll = (data[1] != 0);
	496	if (autopoll != s->autopoll) {
	497	s->autopoll = autopoll;
	498	if (autopoll) {
	499	qemu_mod_timer(s->adb_poll_timer,
	500	qemu_get_clock(vm_clock) +
	501	(ticks_per_sec / CUDA_ADB_POLL_FREQ));
	502	} else {
	503	qemu_del_timer(s->adb_poll_timer);
	504	}
	505	}
267002cd FB	506	obuf[0] = CUDA_PACKET;
	507	obuf[1] = data[1];
	508	cuda_send_packet_to_host(s, obuf, 2);
	509	break;
	510	case CUDA_GET_TIME:
dccfafc4	511	case CUDA_SET_TIME:
267002cd	512	/* XXX: add time support ? */
d7ce296f	513	ti = time(NULL) + RTC_OFFSET;
267002cd FB	514	obuf[0] = CUDA_PACKET;
	515	obuf[1] = 0;
	516	obuf[2] = 0;
	517	obuf[3] = ti >> 24;
	518	obuf[4] = ti >> 16;
	519	obuf[5] = ti >> 8;
	520	obuf[6] = ti;
	521	cuda_send_packet_to_host(s, obuf, 7);
	522	break;
267002cd FB	523	case CUDA_FILE_SERVER_FLAG:
	524	case CUDA_SET_DEVICE_LIST:
	525	case CUDA_SET_AUTO_RATE:
	526	case CUDA_SET_POWER_MESSAGES:
	527	obuf[0] = CUDA_PACKET;
	528	obuf[1] = 0;
	529	cuda_send_packet_to_host(s, obuf, 2);
	530	break;
d7ce296f FB	531	case CUDA_POWERDOWN:
	532	obuf[0] = CUDA_PACKET;
	533	obuf[1] = 0;
	534	cuda_send_packet_to_host(s, obuf, 2);
	535	qemu_system_shutdown_request();
	536	break;
267002cd FB	537	default:
	538	break;
	539	}
	540	}
	541
	542	static void cuda_receive_packet_from_host(CUDAState *s,
	543	const uint8_t *data, int len)
	544	{
819e712b FB	545	#ifdef DEBUG_CUDA_PACKET
	546	{
	547	int i;
	548	printf("cuda_receive_packet_to_host:\n");
	549	for(i = 0; i < len; i++)
	550	printf(" %02x", data[i]);
	551	printf("\n");
	552	}
	553	#endif
267002cd FB	554	switch(data[0]) {
267002cd FB	555	case ADB_PACKET:
e2733d20 FB	556	{
	557	uint8_t obuf[ADB_MAX_OUT_LEN + 2];
	558	int olen;
	559	olen = adb_request(&adb_bus, obuf + 2, data + 1, len - 1);
38f0b147	560	if (olen > 0) {
e2733d20 FB	561	obuf[0] = ADB_PACKET;
	562	obuf[1] = 0x00;
	563	} else {
38f0b147	564	/* error */
e2733d20	565	obuf[0] = ADB_PACKET;
38f0b147 FB	566	obuf[1] = -olen;
38f0b147 FB	567	olen = 0;
e2733d20 FB	568	}
	569	cuda_send_packet_to_host(s, obuf, olen + 2);
	570	}
267002cd FB	571	break;
	572	case CUDA_PACKET:
	573	cuda_receive_packet(s, data + 1, len - 1);
	574	break;
	575	}
	576	}
	577
	578	static void cuda_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
	579	{
	580	}
	581
	582	static void cuda_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
	583	{
	584	}
	585
	586	static uint32_t cuda_readw (void *opaque, target_phys_addr_t addr)
	587	{
	588	return 0;
	589	}
	590
	591	static uint32_t cuda_readl (void *opaque, target_phys_addr_t addr)
	592	{
	593	return 0;
	594	}
	595
	596	static CPUWriteMemoryFunc *cuda_write[] = {
	597	&cuda_writeb,
	598	&cuda_writew,
	599	&cuda_writel,
	600	};
	601
	602	static CPUReadMemoryFunc *cuda_read[] = {
	603	&cuda_readb,
	604	&cuda_readw,
	605	&cuda_readl,
	606	};
	607
819e712b	608	int cuda_init(openpic_t *openpic, int irq)
267002cd FB	609	{
	610	CUDAState *s = &cuda_state;
	611	int cuda_mem_index;
	612
819e712b FB	613	s->openpic = openpic;
	614	s->irq = irq;
	615
267002cd	616	s->timers[0].timer = qemu_new_timer(vm_clock, cuda_timer1, s);
819e712b FB	617	s->timers[0].latch = 0x10000;
819e712b FB	618	set_counter(s, &s->timers[0], 0xffff);
267002cd	619	s->timers[1].latch = 0x10000;
819e712b FB	620	s->ier = T1_INT \| SR_INT;
819e712b FB	621	set_counter(s, &s->timers[1], 0xffff);
e2733d20 FB	622
e2733d20 FB	623	s->adb_poll_timer = qemu_new_timer(vm_clock, cuda_adb_poll, s);
267002cd FB	624	cuda_mem_index = cpu_register_io_memory(0, cuda_read, cuda_write, s);
	625	return cuda_mem_index;
	626	}