[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) / s->latch);
        base = (base * s->latch) + s->counter_value;
        next_time = base + s->latch;
    }
#ifdef DEBUG_CUDA
    printf("latch=%d counter=%lld delta_next=%lld\n", 
           s->latch, d, next_time - d);
#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:
        /* 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_SET_TIME:
    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);
	181	if (d <= s->counter_value) {
	182	next_time = s->counter_value + 1;
	183	} else {
819e712b	184	base = ((d - s->counter_value) / s->latch);
267002cd FB	185	base = (base * s->latch) + s->counter_value;
	186	next_time = base + s->latch;
	187	}
819e712b FB	188	#ifdef DEBUG_CUDA
	189	printf("latch=%d counter=%lld delta_next=%lld\n",
	190	s->latch, d, next_time - d);
	191	#endif
267002cd FB	192	next_time = muldiv64(next_time, ticks_per_sec, CUDA_TIMER_FREQ) +
	193	s->load_time;
	194	if (next_time <= current_time)
	195	next_time = current_time + 1;
	196	return next_time;
	197	}
	198
819e712b FB	199	static void cuda_timer_update(CUDAState s, CUDATimer ti,
	200	int64_t current_time)
	201	{
	202	if (!ti->timer)
	203	return;
	204	if ((s->acr & T1MODE) != T1MODE_CONT) {
	205	qemu_del_timer(ti->timer);
	206	} else {
	207	ti->next_irq_time = get_next_irq_time(ti, current_time);
	208	qemu_mod_timer(ti->timer, ti->next_irq_time);
	209	}
	210	}
	211
267002cd FB	212	static void cuda_timer1(void *opaque)
	213	{
	214	CUDAState *s = opaque;
	215	CUDATimer *ti = &s->timers[0];
	216
819e712b	217	cuda_timer_update(s, ti, ti->next_irq_time);
267002cd FB	218	s->ifr \|= T1_INT;
	219	cuda_update_irq(s);
	220	}
	221
	222	static uint32_t cuda_readb(void *opaque, target_phys_addr_t addr)
	223	{
	224	CUDAState *s = opaque;
	225	uint32_t val;
	226
	227	addr = (addr >> 9) & 0xf;
	228	switch(addr) {
	229	case 0:
	230	val = s->b;
	231	break;
	232	case 1:
	233	val = s->a;
	234	break;
	235	case 2:
	236	val = s->dirb;
	237	break;
	238	case 3:
	239	val = s->dira;
	240	break;
	241	case 4:
	242	val = get_counter(&s->timers[0]) & 0xff;
	243	s->ifr &= ~T1_INT;
	244	cuda_update_irq(s);
	245	break;
	246	case 5:
	247	val = get_counter(&s->timers[0]) >> 8;
	248	s->ifr &= ~T1_INT;
	249	cuda_update_irq(s);
	250	break;
	251	case 6:
	252	val = s->timers[0].latch & 0xff;
	253	break;
	254	case 7:
	255	val = (s->timers[0].latch >> 8) & 0xff;
	256	break;
	257	case 8:
	258	val = get_counter(&s->timers[1]) & 0xff;
	259	break;
	260	case 9:
	261	val = get_counter(&s->timers[1]) >> 8;
	262	break;
	263	case 10:
819e712b FB	264	val = s->sr;
	265	s->ifr &= ~SR_INT;
	266	cuda_update_irq(s);
267002cd FB	267	break;
	268	case 11:
	269	val = s->acr;
	270	break;
	271	case 12:
	272	val = s->pcr;
	273	break;
	274	case 13:
	275	val = s->ifr;
	276	break;
	277	case 14:
	278	val = s->ier;
	279	break;
	280	default:
	281	case 15:
	282	val = s->anh;
	283	break;
	284	}
	285	#ifdef DEBUG_CUDA
819e712b FB	286	if (addr != 13 \|\| val != 0)
819e712b FB	287	printf("cuda: read: reg=0x%x val=%02x\n", addr, val);
267002cd FB	288	#endif
	289	return val;
	290	}
	291
	292	static void cuda_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
	293	{
	294	CUDAState *s = opaque;
	295
	296	addr = (addr >> 9) & 0xf;
	297	#ifdef DEBUG_CUDA
	298	printf("cuda: write: reg=0x%x val=%02x\n", addr, val);
	299	#endif
	300
	301	switch(addr) {
	302	case 0:
	303	s->b = val;
	304	cuda_update(s);
	305	break;
	306	case 1:
	307	s->a = val;
	308	break;
	309	case 2:
	310	s->dirb = val;
	311	break;
	312	case 3:
	313	s->dira = val;
	314	break;
	315	case 4:
	316	val = val \| (get_counter(&s->timers[0]) & 0xff00);
819e712b	317	set_counter(s, &s->timers[0], val);
267002cd FB	318	break;
	319	case 5:
	320	val = (val << 8) \| (get_counter(&s->timers[0]) & 0xff);
819e712b	321	set_counter(s, &s->timers[0], val);
267002cd FB	322	break;
	323	case 6:
	324	s->timers[0].latch = (s->timers[0].latch & 0xff00) \| val;
819e712b	325	cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
267002cd FB	326	break;
	327	case 7:
	328	s->timers[0].latch = (s->timers[0].latch & 0xff) \| (val << 8);
819e712b	329	cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
267002cd FB	330	break;
	331	case 8:
	332	val = val \| (get_counter(&s->timers[1]) & 0xff00);
819e712b	333	set_counter(s, &s->timers[1], val);
267002cd FB	334	break;
	335	case 9:
	336	val = (val << 8) \| (get_counter(&s->timers[1]) & 0xff);
819e712b	337	set_counter(s, &s->timers[1], val);
267002cd FB	338	break;
	339	case 10:
	340	s->sr = val;
	341	break;
	342	case 11:
	343	s->acr = val;
819e712b	344	cuda_timer_update(s, &s->timers[0], qemu_get_clock(vm_clock));
267002cd FB	345	cuda_update(s);
	346	break;
	347	case 12:
	348	s->pcr = val;
	349	break;
	350	case 13:
	351	/* reset bits */
	352	s->ifr &= ~val;
	353	cuda_update_irq(s);
	354	break;
	355	case 14:
	356	if (val & IER_SET) {
	357	/* set bits */
	358	s->ier \|= val & 0x7f;
	359	} else {
	360	/* reset bits */
	361	s->ier &= ~val;
	362	}
	363	cuda_update_irq(s);
	364	break;
	365	default:
	366	case 15:
	367	s->anh = val;
	368	break;
	369	}
	370	}
	371
	372	/* NOTE: TIP and TREQ are negated */
	373	static void cuda_update(CUDAState *s)
	374	{
819e712b FB	375	int packet_received, len;
	376
	377	packet_received = 0;
	378	if (!(s->b & TIP)) {
	379	/* transfer requested from host */
267002cd	380
819e712b FB	381	if (s->acr & SR_OUT) {
	382	/* data output */
	383	if ((s->b & (TACK \| TIP)) != (s->last_b & (TACK \| TIP))) {
	384	if (s->data_out_index < sizeof(s->data_out)) {
	385	#ifdef DEBUG_CUDA
	386	printf("cuda: send: %02x\n", s->sr);
	387	#endif
	388	s->data_out[s->data_out_index++] = s->sr;
	389	s->ifr \|= SR_INT;
	390	cuda_update_irq(s);
	391	}
	392	}
	393	} else {
	394	if (s->data_in_index < s->data_in_size) {
	395	/* data input */
	396	if ((s->b & (TACK \| TIP)) != (s->last_b & (TACK \| TIP))) {
	397	s->sr = s->data_in[s->data_in_index++];
	398	#ifdef DEBUG_CUDA
	399	printf("cuda: recv: %02x\n", s->sr);
	400	#endif
	401	/* indicate end of transfer */
	402	if (s->data_in_index >= s->data_in_size) {
	403	s->b = (s->b \| TREQ);
	404	}
	405	s->ifr \|= SR_INT;
	406	cuda_update_irq(s);
	407	}
267002cd	408	}
819e712b FB	409	}
	410	} else {
	411	/* no transfer requested: handle sync case */
	412	if ((s->last_b & TIP) && (s->b & TACK) != (s->last_b & TACK)) {
	413	/* update TREQ state each time TACK change state */
	414	if (s->b & TACK)
	415	s->b = (s->b \| TREQ);
	416	else
	417	s->b = (s->b & ~TREQ);
267002cd FB	418	s->ifr \|= SR_INT;
267002cd FB	419	cuda_update_irq(s);
819e712b FB	420	} else {
	421	if (!(s->last_b & TIP)) {
	422	/* handle end of host to cuda transfert */
	423	packet_received = (s->data_out_index > 0);
	424	/* always an IRQ at the end of transfert */
	425	s->ifr \|= SR_INT;
	426	cuda_update_irq(s);
	427	}
	428	/* signal if there is data to read */
	429	if (s->data_in_index < s->data_in_size) {
	430	s->b = (s->b & ~TREQ);
	431	}
267002cd FB	432	}
	433	}
	434
267002cd FB	435	s->last_acr = s->acr;
267002cd FB	436	s->last_b = s->b;
819e712b FB	437
	438	/* NOTE: cuda_receive_packet_from_host() can call cuda_update()
	439	recursively */
	440	if (packet_received) {
	441	len = s->data_out_index;
	442	s->data_out_index = 0;
	443	cuda_receive_packet_from_host(s, s->data_out, len);
	444	}
267002cd FB	445	}
	446
	447	static void cuda_send_packet_to_host(CUDAState *s,
	448	const uint8_t *data, int len)
	449	{
819e712b FB	450	#ifdef DEBUG_CUDA_PACKET
	451	{
	452	int i;
	453	printf("cuda_send_packet_to_host:\n");
	454	for(i = 0; i < len; i++)
	455	printf(" %02x", data[i]);
	456	printf("\n");
	457	}
	458	#endif
267002cd FB	459	memcpy(s->data_in, data, len);
	460	s->data_in_size = len;
	461	s->data_in_index = 0;
	462	cuda_update(s);
	463	s->ifr \|= SR_INT;
	464	cuda_update_irq(s);
	465	}
	466
7db4eea6	467	static void cuda_adb_poll(void *opaque)
e2733d20 FB	468	{
	469	CUDAState *s = opaque;
	470	uint8_t obuf[ADB_MAX_OUT_LEN + 2];
	471	int olen;
	472
	473	olen = adb_poll(&adb_bus, obuf + 2);
	474	if (olen > 0) {
	475	obuf[0] = ADB_PACKET;
	476	obuf[1] = 0x40; /* polled data */
	477	cuda_send_packet_to_host(s, obuf, olen + 2);
	478	}
	479	qemu_mod_timer(s->adb_poll_timer,
	480	qemu_get_clock(vm_clock) +
	481	(ticks_per_sec / CUDA_ADB_POLL_FREQ));
	482	}
	483
267002cd FB	484	static void cuda_receive_packet(CUDAState *s,
	485	const uint8_t *data, int len)
	486	{
	487	uint8_t obuf[16];
e2733d20	488	int ti, autopoll;
267002cd FB	489
	490	switch(data[0]) {
	491	case CUDA_AUTOPOLL:
e2733d20 FB	492	autopoll = (data[1] != 0);
	493	if (autopoll != s->autopoll) {
	494	s->autopoll = autopoll;
	495	if (autopoll) {
	496	qemu_mod_timer(s->adb_poll_timer,
	497	qemu_get_clock(vm_clock) +
	498	(ticks_per_sec / CUDA_ADB_POLL_FREQ));
	499	} else {
	500	qemu_del_timer(s->adb_poll_timer);
	501	}
	502	}
267002cd FB	503	obuf[0] = CUDA_PACKET;
	504	obuf[1] = data[1];
	505	cuda_send_packet_to_host(s, obuf, 2);
	506	break;
	507	case CUDA_GET_TIME:
	508	/* XXX: add time support ? */
d7ce296f	509	ti = time(NULL) + RTC_OFFSET;
267002cd FB	510	obuf[0] = CUDA_PACKET;
	511	obuf[1] = 0;
	512	obuf[2] = 0;
	513	obuf[3] = ti >> 24;
	514	obuf[4] = ti >> 16;
	515	obuf[5] = ti >> 8;
	516	obuf[6] = ti;
	517	cuda_send_packet_to_host(s, obuf, 7);
	518	break;
	519	case CUDA_SET_TIME:
	520	case CUDA_FILE_SERVER_FLAG:
	521	case CUDA_SET_DEVICE_LIST:
	522	case CUDA_SET_AUTO_RATE:
	523	case CUDA_SET_POWER_MESSAGES:
	524	obuf[0] = CUDA_PACKET;
	525	obuf[1] = 0;
	526	cuda_send_packet_to_host(s, obuf, 2);
	527	break;
d7ce296f FB	528	case CUDA_POWERDOWN:
	529	obuf[0] = CUDA_PACKET;
	530	obuf[1] = 0;
	531	cuda_send_packet_to_host(s, obuf, 2);
	532	qemu_system_shutdown_request();
	533	break;
267002cd FB	534	default:
	535	break;
	536	}
	537	}
	538
	539	static void cuda_receive_packet_from_host(CUDAState *s,
	540	const uint8_t *data, int len)
	541	{
819e712b FB	542	#ifdef DEBUG_CUDA_PACKET
	543	{
	544	int i;
	545	printf("cuda_receive_packet_to_host:\n");
	546	for(i = 0; i < len; i++)
	547	printf(" %02x", data[i]);
	548	printf("\n");
	549	}
	550	#endif
267002cd FB	551	switch(data[0]) {
267002cd FB	552	case ADB_PACKET:
e2733d20 FB	553	{
	554	uint8_t obuf[ADB_MAX_OUT_LEN + 2];
	555	int olen;
	556	olen = adb_request(&adb_bus, obuf + 2, data + 1, len - 1);
38f0b147	557	if (olen > 0) {
e2733d20 FB	558	obuf[0] = ADB_PACKET;
	559	obuf[1] = 0x00;
	560	} else {
38f0b147	561	/* error */
e2733d20	562	obuf[0] = ADB_PACKET;
38f0b147 FB	563	obuf[1] = -olen;
38f0b147 FB	564	olen = 0;
e2733d20 FB	565	}
	566	cuda_send_packet_to_host(s, obuf, olen + 2);
	567	}
267002cd FB	568	break;
	569	case CUDA_PACKET:
	570	cuda_receive_packet(s, data + 1, len - 1);
	571	break;
	572	}
	573	}
	574
	575	static void cuda_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
	576	{
	577	}
	578
	579	static void cuda_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
	580	{
	581	}
	582
	583	static uint32_t cuda_readw (void *opaque, target_phys_addr_t addr)
	584	{
	585	return 0;
	586	}
	587
	588	static uint32_t cuda_readl (void *opaque, target_phys_addr_t addr)
	589	{
	590	return 0;
	591	}
	592
	593	static CPUWriteMemoryFunc *cuda_write[] = {
	594	&cuda_writeb,
	595	&cuda_writew,
	596	&cuda_writel,
	597	};
	598
	599	static CPUReadMemoryFunc *cuda_read[] = {
	600	&cuda_readb,
	601	&cuda_readw,
	602	&cuda_readl,
	603	};
	604
819e712b	605	int cuda_init(openpic_t *openpic, int irq)
267002cd FB	606	{
	607	CUDAState *s = &cuda_state;
	608	int cuda_mem_index;
	609
819e712b FB	610	s->openpic = openpic;
	611	s->irq = irq;
	612
267002cd	613	s->timers[0].timer = qemu_new_timer(vm_clock, cuda_timer1, s);
819e712b FB	614	s->timers[0].latch = 0x10000;
819e712b FB	615	set_counter(s, &s->timers[0], 0xffff);
267002cd	616	s->timers[1].latch = 0x10000;
819e712b FB	617	s->ier = T1_INT \| SR_INT;
819e712b FB	618	set_counter(s, &s->timers[1], 0xffff);
e2733d20 FB	619
e2733d20 FB	620	s->adb_poll_timer = qemu_new_timer(vm_clock, cuda_adb_poll, s);
267002cd FB	621	cuda_mem_index = cpu_register_io_memory(0, cuda_read, cuda_write, s);
	622	return cuda_mem_index;
	623	}