[qemu.git] / hw / char / exynos4210_uart.c

/*
 *  Exynos4210 UART Emulation
 *
 *  Copyright (C) 2011 Samsung Electronics Co Ltd.
 *    Maksim Kozlov, <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "hw/sysbus.h"
#include "sysemu/sysemu.h"
#include "sysemu/char.h"

#include "hw/arm/exynos4210.h"

#undef DEBUG_UART
#undef DEBUG_UART_EXTEND
#undef DEBUG_IRQ
#undef DEBUG_Rx_DATA
#undef DEBUG_Tx_DATA

#define DEBUG_UART            0
#define DEBUG_UART_EXTEND     0
#define DEBUG_IRQ             0
#define DEBUG_Rx_DATA         0
#define DEBUG_Tx_DATA         0

#if DEBUG_UART
#define  PRINT_DEBUG(fmt, args...)  \
        do { \
            fprintf(stderr, "  [%s:%d]   "fmt, __func__, __LINE__, ##args); \
        } while (0)

#if DEBUG_UART_EXTEND
#define  PRINT_DEBUG_EXTEND(fmt, args...) \
        do { \
            fprintf(stderr, "  [%s:%d]   "fmt, __func__, __LINE__, ##args); \
        } while (0)
#else
#define  PRINT_DEBUG_EXTEND(fmt, args...) \
        do {} while (0)
#endif /* EXTEND */

#else
#define  PRINT_DEBUG(fmt, args...)  \
        do {} while (0)
#define  PRINT_DEBUG_EXTEND(fmt, args...) \
        do {} while (0)
#endif

#define  PRINT_ERROR(fmt, args...) \
        do { \
            fprintf(stderr, "  [%s:%d]   "fmt, __func__, __LINE__, ##args); \
        } while (0)

/*
 *  Offsets for UART registers relative to SFR base address
 *  for UARTn
 *
 */
#define ULCON      0x0000 /* Line Control             */
#define UCON       0x0004 /* Control                  */
#define UFCON      0x0008 /* FIFO Control             */
#define UMCON      0x000C /* Modem Control            */
#define UTRSTAT    0x0010 /* Tx/Rx Status             */
#define UERSTAT    0x0014 /* UART Error Status        */
#define UFSTAT     0x0018 /* FIFO Status              */
#define UMSTAT     0x001C /* Modem Status             */
#define UTXH       0x0020 /* Transmit Buffer          */
#define URXH       0x0024 /* Receive Buffer           */
#define UBRDIV     0x0028 /* Baud Rate Divisor        */
#define UFRACVAL   0x002C /* Divisor Fractional Value */
#define UINTP      0x0030 /* Interrupt Pending        */
#define UINTSP     0x0034 /* Interrupt Source Pending */
#define UINTM      0x0038 /* Interrupt Mask           */

/*
 * for indexing register in the uint32_t array
 *
 * 'reg' - register offset (see offsets definitions above)
 *
 */
#define I_(reg) (reg / sizeof(uint32_t))

typedef struct Exynos4210UartReg {
    const char         *name; /* the only reason is the debug output */
    hwaddr  offset;
    uint32_t            reset_value;
} Exynos4210UartReg;

static Exynos4210UartReg exynos4210_uart_regs[] = {
    {"ULCON",    ULCON,    0x00000000},
    {"UCON",     UCON,     0x00003000},
    {"UFCON",    UFCON,    0x00000000},
    {"UMCON",    UMCON,    0x00000000},
    {"UTRSTAT",  UTRSTAT,  0x00000006}, /* RO */
    {"UERSTAT",  UERSTAT,  0x00000000}, /* RO */
    {"UFSTAT",   UFSTAT,   0x00000000}, /* RO */
    {"UMSTAT",   UMSTAT,   0x00000000}, /* RO */
    {"UTXH",     UTXH,     0x5c5c5c5c}, /* WO, undefined reset value*/
    {"URXH",     URXH,     0x00000000}, /* RO */
    {"UBRDIV",   UBRDIV,   0x00000000},
    {"UFRACVAL", UFRACVAL, 0x00000000},
    {"UINTP",    UINTP,    0x00000000},
    {"UINTSP",   UINTSP,   0x00000000},
    {"UINTM",    UINTM,    0x00000000},
};

#define EXYNOS4210_UART_REGS_MEM_SIZE    0x3C

/* UART FIFO Control */
#define UFCON_FIFO_ENABLE                    0x1
#define UFCON_Rx_FIFO_RESET                  0x2
#define UFCON_Tx_FIFO_RESET                  0x4
#define UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT    8
#define UFCON_Tx_FIFO_TRIGGER_LEVEL (7 << UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT)
#define UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT    4
#define UFCON_Rx_FIFO_TRIGGER_LEVEL (7 << UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT)

/* Uart FIFO Status */
#define UFSTAT_Rx_FIFO_COUNT        0xff
#define UFSTAT_Rx_FIFO_FULL         0x100
#define UFSTAT_Rx_FIFO_ERROR        0x200
#define UFSTAT_Tx_FIFO_COUNT_SHIFT  16
#define UFSTAT_Tx_FIFO_COUNT        (0xff << UFSTAT_Tx_FIFO_COUNT_SHIFT)
#define UFSTAT_Tx_FIFO_FULL_SHIFT   24
#define UFSTAT_Tx_FIFO_FULL         (1 << UFSTAT_Tx_FIFO_FULL_SHIFT)

/* UART Interrupt Source Pending */
#define UINTSP_RXD      0x1 /* Receive interrupt  */
#define UINTSP_ERROR    0x2 /* Error interrupt    */
#define UINTSP_TXD      0x4 /* Transmit interrupt */
#define UINTSP_MODEM    0x8 /* Modem interrupt    */

/* UART Line Control */
#define ULCON_IR_MODE_SHIFT   6
#define ULCON_PARITY_SHIFT    3
#define ULCON_STOP_BIT_SHIFT  1

/* UART Tx/Rx Status */
#define UTRSTAT_TRANSMITTER_EMPTY       0x4
#define UTRSTAT_Tx_BUFFER_EMPTY         0x2
#define UTRSTAT_Rx_BUFFER_DATA_READY    0x1

/* UART Error Status */
#define UERSTAT_OVERRUN  0x1
#define UERSTAT_PARITY   0x2
#define UERSTAT_FRAME    0x4
#define UERSTAT_BREAK    0x8

typedef struct {
    uint8_t    *data;
    uint32_t    sp, rp; /* store and retrieve pointers */
    uint32_t    size;
} Exynos4210UartFIFO;

#define TYPE_EXYNOS4210_UART "exynos4210.uart"
#define EXYNOS4210_UART(obj) \
    OBJECT_CHECK(Exynos4210UartState, (obj), TYPE_EXYNOS4210_UART)

typedef struct Exynos4210UartState {
    SysBusDevice parent_obj;

    MemoryRegion iomem;

    uint32_t             reg[EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)];
    Exynos4210UartFIFO   rx;
    Exynos4210UartFIFO   tx;

    CharDriverState  *chr;
    qemu_irq          irq;

    uint32_t channel;

} Exynos4210UartState;


#if DEBUG_UART
/* Used only for debugging inside PRINT_DEBUG_... macros */
static const char *exynos4210_uart_regname(hwaddr  offset)
{

    int i;

    for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) {
        if (offset == exynos4210_uart_regs[i].offset) {
            return exynos4210_uart_regs[i].name;
        }
    }

    return NULL;
}
#endif


static void fifo_store(Exynos4210UartFIFO *q, uint8_t ch)
{
    q->data[q->sp] = ch;
    q->sp = (q->sp + 1) % q->size;
}

static uint8_t fifo_retrieve(Exynos4210UartFIFO *q)
{
    uint8_t ret = q->data[q->rp];
    q->rp = (q->rp + 1) % q->size;
    return  ret;
}

static int fifo_elements_number(Exynos4210UartFIFO *q)
{
    if (q->sp < q->rp) {
        return q->size - q->rp + q->sp;
    }

    return q->sp - q->rp;
}

static int fifo_empty_elements_number(Exynos4210UartFIFO *q)
{
    return q->size - fifo_elements_number(q);
}

static void fifo_reset(Exynos4210UartFIFO *q)
{
    if (q->data != NULL) {
        g_free(q->data);
        q->data = NULL;
    }

    q->data = (uint8_t *)g_malloc0(q->size);

    q->sp = 0;
    q->rp = 0;
}

static uint32_t exynos4210_uart_Tx_FIFO_trigger_level(Exynos4210UartState *s)
{
    uint32_t level = 0;
    uint32_t reg;

    reg = (s->reg[I_(UFCON)] & UFCON_Tx_FIFO_TRIGGER_LEVEL) >>
            UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT;

    switch (s->channel) {
    case 0:
        level = reg * 32;
        break;
    case 1:
    case 4:
        level = reg * 8;
        break;
    case 2:
    case 3:
        level = reg * 2;
        break;
    default:
        level = 0;
        PRINT_ERROR("Wrong UART channel number: %d\n", s->channel);
    }

    return level;
}

static void exynos4210_uart_update_irq(Exynos4210UartState *s)
{
    /*
     * The Tx interrupt is always requested if the number of data in the
     * transmit FIFO is smaller than the trigger level.
     */
    if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {

        uint32_t count = (s->reg[I_(UFSTAT)] & UFSTAT_Tx_FIFO_COUNT) >>
                UFSTAT_Tx_FIFO_COUNT_SHIFT;

        if (count <= exynos4210_uart_Tx_FIFO_trigger_level(s)) {
            s->reg[I_(UINTSP)] |= UINTSP_TXD;
        }
    }

    s->reg[I_(UINTP)] = s->reg[I_(UINTSP)] & ~s->reg[I_(UINTM)];

    if (s->reg[I_(UINTP)]) {
        qemu_irq_raise(s->irq);

#if DEBUG_IRQ
        fprintf(stderr, "UART%d: IRQ has been raised: %08x\n",
                s->channel, s->reg[I_(UINTP)]);
#endif

    } else {
        qemu_irq_lower(s->irq);
    }
}

static void exynos4210_uart_update_parameters(Exynos4210UartState *s)
{
    int speed, parity, data_bits, stop_bits, frame_size;
    QEMUSerialSetParams ssp;
    uint64_t uclk_rate;

    if (s->reg[I_(UBRDIV)] == 0) {
        return;
    }

    frame_size = 1; /* start bit */
    if (s->reg[I_(ULCON)] & 0x20) {
        frame_size++; /* parity bit */
        if (s->reg[I_(ULCON)] & 0x28) {
            parity = 'E';
        } else {
            parity = 'O';
        }
    } else {
        parity = 'N';
    }

    if (s->reg[I_(ULCON)] & 0x4) {
        stop_bits = 2;
    } else {
        stop_bits = 1;
    }

    data_bits = (s->reg[I_(ULCON)] & 0x3) + 5;

    frame_size += data_bits + stop_bits;

    uclk_rate = 24000000;

    speed = uclk_rate / ((16 * (s->reg[I_(UBRDIV)]) & 0xffff) +
            (s->reg[I_(UFRACVAL)] & 0x7) + 16);

    ssp.speed     = speed;
    ssp.parity    = parity;
    ssp.data_bits = data_bits;
    ssp.stop_bits = stop_bits;

    qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);

    PRINT_DEBUG("UART%d: speed: %d, parity: %c, data: %d, stop: %d\n",
                s->channel, speed, parity, data_bits, stop_bits);
}

static void exynos4210_uart_write(void *opaque, hwaddr offset,
                               uint64_t val, unsigned size)
{
    Exynos4210UartState *s = (Exynos4210UartState *)opaque;
    uint8_t ch;

    PRINT_DEBUG_EXTEND("UART%d: <0x%04x> %s <- 0x%08llx\n", s->channel,
        offset, exynos4210_uart_regname(offset), (long long unsigned int)val);

    switch (offset) {
    case ULCON:
    case UBRDIV:
    case UFRACVAL:
        s->reg[I_(offset)] = val;
        exynos4210_uart_update_parameters(s);
        break;
    case UFCON:
        s->reg[I_(UFCON)] = val;
        if (val & UFCON_Rx_FIFO_RESET) {
            fifo_reset(&s->rx);
            s->reg[I_(UFCON)] &= ~UFCON_Rx_FIFO_RESET;
            PRINT_DEBUG("UART%d: Rx FIFO Reset\n", s->channel);
        }
        if (val & UFCON_Tx_FIFO_RESET) {
            fifo_reset(&s->tx);
            s->reg[I_(UFCON)] &= ~UFCON_Tx_FIFO_RESET;
            PRINT_DEBUG("UART%d: Tx FIFO Reset\n", s->channel);
        }
        break;

    case UTXH:
        if (s->chr) {
            s->reg[I_(UTRSTAT)] &= ~(UTRSTAT_TRANSMITTER_EMPTY |
                    UTRSTAT_Tx_BUFFER_EMPTY);
            ch = (uint8_t)val;
            qemu_chr_fe_write(s->chr, &ch, 1);
#if DEBUG_Tx_DATA
            fprintf(stderr, "%c", ch);
#endif
            s->reg[I_(UTRSTAT)] |= UTRSTAT_TRANSMITTER_EMPTY |
                    UTRSTAT_Tx_BUFFER_EMPTY;
            s->reg[I_(UINTSP)]  |= UINTSP_TXD;
            exynos4210_uart_update_irq(s);
        }
        break;

    case UINTP:
        s->reg[I_(UINTP)] &= ~val;
        s->reg[I_(UINTSP)] &= ~val;
        PRINT_DEBUG("UART%d: UINTP [%04x] have been cleared: %08x\n",
                    s->channel, offset, s->reg[I_(UINTP)]);
        exynos4210_uart_update_irq(s);
        break;
    case UTRSTAT:
    case UERSTAT:
    case UFSTAT:
    case UMSTAT:
    case URXH:
        PRINT_DEBUG("UART%d: Trying to write into RO register: %s [%04x]\n",
                    s->channel, exynos4210_uart_regname(offset), offset);
        break;
    case UINTSP:
        s->reg[I_(UINTSP)]  &= ~val;
        break;
    case UINTM:
        s->reg[I_(UINTM)] = val;
        exynos4210_uart_update_irq(s);
        break;
    case UCON:
    case UMCON:
    default:
        s->reg[I_(offset)] = val;
        break;
    }
}
static uint64_t exynos4210_uart_read(void *opaque, hwaddr offset,
                                  unsigned size)
{
    Exynos4210UartState *s = (Exynos4210UartState *)opaque;
    uint32_t res;

    switch (offset) {
    case UERSTAT: /* Read Only */
        res = s->reg[I_(UERSTAT)];
        s->reg[I_(UERSTAT)] = 0;
        return res;
    case UFSTAT: /* Read Only */
        s->reg[I_(UFSTAT)] = fifo_elements_number(&s->rx) & 0xff;
        if (fifo_empty_elements_number(&s->rx) == 0) {
            s->reg[I_(UFSTAT)] |= UFSTAT_Rx_FIFO_FULL;
            s->reg[I_(UFSTAT)] &= ~0xff;
        }
        return s->reg[I_(UFSTAT)];
    case URXH:
        if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
            if (fifo_elements_number(&s->rx)) {
                res = fifo_retrieve(&s->rx);
#if DEBUG_Rx_DATA
                fprintf(stderr, "%c", res);
#endif
                if (!fifo_elements_number(&s->rx)) {
                    s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY;
                } else {
                    s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
                }
            } else {
                s->reg[I_(UINTSP)] |= UINTSP_ERROR;
                exynos4210_uart_update_irq(s);
                res = 0;
            }
        } else {
            s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY;
            res = s->reg[I_(URXH)];
        }
        return res;
    case UTXH:
        PRINT_DEBUG("UART%d: Trying to read from WO register: %s [%04x]\n",
                    s->channel, exynos4210_uart_regname(offset), offset);
        break;
    default:
        return s->reg[I_(offset)];
    }

    return 0;
}

static const MemoryRegionOps exynos4210_uart_ops = {
    .read = exynos4210_uart_read,
    .write = exynos4210_uart_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
    .valid = {
        .max_access_size = 4,
        .unaligned = false
    },
};

static int exynos4210_uart_can_receive(void *opaque)
{
    Exynos4210UartState *s = (Exynos4210UartState *)opaque;

    return fifo_empty_elements_number(&s->rx);
}


static void exynos4210_uart_receive(void *opaque, const uint8_t *buf, int size)
{
    Exynos4210UartState *s = (Exynos4210UartState *)opaque;
    int i;

    if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
        if (fifo_empty_elements_number(&s->rx) < size) {
            for (i = 0; i < fifo_empty_elements_number(&s->rx); i++) {
                fifo_store(&s->rx, buf[i]);
            }
            s->reg[I_(UINTSP)] |= UINTSP_ERROR;
            s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
        } else {
            for (i = 0; i < size; i++) {
                fifo_store(&s->rx, buf[i]);
            }
            s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
        }
        /* XXX: Around here we maybe should check Rx trigger level */
        s->reg[I_(UINTSP)] |= UINTSP_RXD;
    } else {
        s->reg[I_(URXH)] = buf[0];
        s->reg[I_(UINTSP)] |= UINTSP_RXD;
        s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
    }

    exynos4210_uart_update_irq(s);
}


static void exynos4210_uart_event(void *opaque, int event)
{
    Exynos4210UartState *s = (Exynos4210UartState *)opaque;

    if (event == CHR_EVENT_BREAK) {
        /* When the RxDn is held in logic 0, then a null byte is pushed into the
         * fifo */
        fifo_store(&s->rx, '\0');
        s->reg[I_(UERSTAT)] |= UERSTAT_BREAK;
        exynos4210_uart_update_irq(s);
    }
}


static void exynos4210_uart_reset(DeviceState *dev)
{
    Exynos4210UartState *s = EXYNOS4210_UART(dev);
    int i;

    for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) {
        s->reg[I_(exynos4210_uart_regs[i].offset)] =
                exynos4210_uart_regs[i].reset_value;
    }

    fifo_reset(&s->rx);
    fifo_reset(&s->tx);

    PRINT_DEBUG("UART%d: Rx FIFO size: %d\n", s->channel, s->rx.size);
}

static const VMStateDescription vmstate_exynos4210_uart_fifo = {
    .name = "exynos4210.uart.fifo",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(sp, Exynos4210UartFIFO),
        VMSTATE_UINT32(rp, Exynos4210UartFIFO),
        VMSTATE_VBUFFER_UINT32(data, Exynos4210UartFIFO, 1, NULL, 0, size),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_exynos4210_uart = {
    .name = "exynos4210.uart",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_STRUCT(rx, Exynos4210UartState, 1,
                       vmstate_exynos4210_uart_fifo, Exynos4210UartFIFO),
        VMSTATE_UINT32_ARRAY(reg, Exynos4210UartState,
                             EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)),
        VMSTATE_END_OF_LIST()
    }
};

DeviceState *exynos4210_uart_create(hwaddr addr,
                                    int fifo_size,
                                    int channel,
                                    CharDriverState *chr,
                                    qemu_irq irq)
{
    DeviceState  *dev;
    SysBusDevice *bus;

    const char chr_name[] = "serial";
    char label[ARRAY_SIZE(chr_name) + 1];

    dev = qdev_create(NULL, TYPE_EXYNOS4210_UART);

    if (!chr) {
        if (channel >= MAX_SERIAL_PORTS) {
            hw_error("Only %d serial ports are supported by QEMU.\n",
                     MAX_SERIAL_PORTS);
        }
        chr = serial_hds[channel];
        if (!chr) {
            snprintf(label, ARRAY_SIZE(label), "%s%d", chr_name, channel);
            chr = qemu_chr_new(label, "null", NULL);
            if (!(chr)) {
                hw_error("Can't assign serial port to UART%d.\n", channel);
            }
        }
    }

    qdev_prop_set_chr(dev, "chardev", chr);
    qdev_prop_set_uint32(dev, "channel", channel);
    qdev_prop_set_uint32(dev, "rx-size", fifo_size);
    qdev_prop_set_uint32(dev, "tx-size", fifo_size);

    bus = SYS_BUS_DEVICE(dev);
    qdev_init_nofail(dev);
    if (addr != (hwaddr)-1) {
        sysbus_mmio_map(bus, 0, addr);
    }
    sysbus_connect_irq(bus, 0, irq);

    return dev;
}

static int exynos4210_uart_init(SysBusDevice *dev)
{
    Exynos4210UartState *s = EXYNOS4210_UART(dev);

    /* memory mapping */
    memory_region_init_io(&s->iomem, OBJECT(s), &exynos4210_uart_ops, s,
                          "exynos4210.uart", EXYNOS4210_UART_REGS_MEM_SIZE);
    sysbus_init_mmio(dev, &s->iomem);

    sysbus_init_irq(dev, &s->irq);

    qemu_chr_add_handlers(s->chr, exynos4210_uart_can_receive,
                          exynos4210_uart_receive, exynos4210_uart_event, s);

    return 0;
}

static Property exynos4210_uart_properties[] = {
    DEFINE_PROP_CHR("chardev", Exynos4210UartState, chr),
    DEFINE_PROP_UINT32("channel", Exynos4210UartState, channel, 0),
    DEFINE_PROP_UINT32("rx-size", Exynos4210UartState, rx.size, 16),
    DEFINE_PROP_UINT32("tx-size", Exynos4210UartState, tx.size, 16),
    DEFINE_PROP_END_OF_LIST(),
};

static void exynos4210_uart_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = exynos4210_uart_init;
    dc->reset = exynos4210_uart_reset;
    dc->props = exynos4210_uart_properties;
    dc->vmsd = &vmstate_exynos4210_uart;
}

static const TypeInfo exynos4210_uart_info = {
    .name          = TYPE_EXYNOS4210_UART,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(Exynos4210UartState),
    .class_init    = exynos4210_uart_class_init,
};

static void exynos4210_uart_register(void)
{
    type_register_static(&exynos4210_uart_info);
}

type_init(exynos4210_uart_register)
Commit	Line	Data
e5a4914e MK	1	/*
	2	* Exynos4210 UART Emulation
	3	*
	4	* Copyright (C) 2011 Samsung Electronics Co Ltd.
	5	* Maksim Kozlov, <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	15	* for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; if not, see <http://www.gnu.org/licenses/>.
	19	*
	20	*/
	21
83c9f4ca	22	#include "hw/sysbus.h"
9c17d615	23	#include "sysemu/sysemu.h"
dccfcd0e	24	#include "sysemu/char.h"
e5a4914e	25
0d09e41a	26	#include "hw/arm/exynos4210.h"
e5a4914e MK	27
	28	#undef DEBUG_UART
	29	#undef DEBUG_UART_EXTEND
	30	#undef DEBUG_IRQ
	31	#undef DEBUG_Rx_DATA
	32	#undef DEBUG_Tx_DATA
	33
	34	#define DEBUG_UART 0
	35	#define DEBUG_UART_EXTEND 0
	36	#define DEBUG_IRQ 0
	37	#define DEBUG_Rx_DATA 0
	38	#define DEBUG_Tx_DATA 0
	39
	40	#if DEBUG_UART
	41	#define PRINT_DEBUG(fmt, args...) \
	42	do { \
	43	fprintf(stderr, " [%s:%d] "fmt, __func__, __LINE__, ##args); \
	44	} while (0)
	45
	46	#if DEBUG_UART_EXTEND
	47	#define PRINT_DEBUG_EXTEND(fmt, args...) \
	48	do { \
	49	fprintf(stderr, " [%s:%d] "fmt, __func__, __LINE__, ##args); \
	50	} while (0)
	51	#else
	52	#define PRINT_DEBUG_EXTEND(fmt, args...) \
	53	do {} while (0)
	54	#endif /* EXTEND */
	55
	56	#else
	57	#define PRINT_DEBUG(fmt, args...) \
	58	do {} while (0)
	59	#define PRINT_DEBUG_EXTEND(fmt, args...) \
	60	do {} while (0)
	61	#endif
	62
	63	#define PRINT_ERROR(fmt, args...) \
	64	do { \
	65	fprintf(stderr, " [%s:%d] "fmt, __func__, __LINE__, ##args); \
	66	} while (0)
	67
	68	/*
	69	* Offsets for UART registers relative to SFR base address
	70	* for UARTn
	71	*
	72	*/
	73	#define ULCON 0x0000 /* Line Control */
	74	#define UCON 0x0004 /* Control */
	75	#define UFCON 0x0008 /* FIFO Control */
	76	#define UMCON 0x000C /* Modem Control */
	77	#define UTRSTAT 0x0010 /* Tx/Rx Status */
	78	#define UERSTAT 0x0014 /* UART Error Status */
	79	#define UFSTAT 0x0018 /* FIFO Status */
	80	#define UMSTAT 0x001C /* Modem Status */
	81	#define UTXH 0x0020 /* Transmit Buffer */
	82	#define URXH 0x0024 /* Receive Buffer */
	83	#define UBRDIV 0x0028 /* Baud Rate Divisor */
	84	#define UFRACVAL 0x002C /* Divisor Fractional Value */
	85	#define UINTP 0x0030 /* Interrupt Pending */
	86	#define UINTSP 0x0034 /* Interrupt Source Pending */
	87	#define UINTM 0x0038 /* Interrupt Mask */
	88
	89	/*
	90	* for indexing register in the uint32_t array
91	*
92	* 'reg' - register offset (see offsets definitions above)
93	*
94	*/
95	#define I_(reg) (reg / sizeof(uint32_t))
96
97	typedef struct Exynos4210UartReg {
98	const char name; / the only reason is the debug output */
a8170e5e	99	hwaddr offset;
e5a4914e MK	100	uint32_t reset_value;
	101	} Exynos4210UartReg;
	102
	103	static Exynos4210UartReg exynos4210_uart_regs[] = {
	104	{"ULCON", ULCON, 0x00000000},
	105	{"UCON", UCON, 0x00003000},
	106	{"UFCON", UFCON, 0x00000000},
	107	{"UMCON", UMCON, 0x00000000},
	108	{"UTRSTAT", UTRSTAT, 0x00000006}, /* RO */
	109	{"UERSTAT", UERSTAT, 0x00000000}, /* RO */
	110	{"UFSTAT", UFSTAT, 0x00000000}, /* RO */
	111	{"UMSTAT", UMSTAT, 0x00000000}, /* RO */
	112	{"UTXH", UTXH, 0x5c5c5c5c}, /* WO, undefined reset value*/
	113	{"URXH", URXH, 0x00000000}, /* RO */
	114	{"UBRDIV", UBRDIV, 0x00000000},
	115	{"UFRACVAL", UFRACVAL, 0x00000000},
	116	{"UINTP", UINTP, 0x00000000},
	117	{"UINTSP", UINTSP, 0x00000000},
	118	{"UINTM", UINTM, 0x00000000},
	119	};
	120
	121	#define EXYNOS4210_UART_REGS_MEM_SIZE 0x3C
	122
	123	/* UART FIFO Control */
	124	#define UFCON_FIFO_ENABLE 0x1
	125	#define UFCON_Rx_FIFO_RESET 0x2
	126	#define UFCON_Tx_FIFO_RESET 0x4
	127	#define UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT 8
	128	#define UFCON_Tx_FIFO_TRIGGER_LEVEL (7 << UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT)
	129	#define UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT 4
	130	#define UFCON_Rx_FIFO_TRIGGER_LEVEL (7 << UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT)
	131
	132	/* Uart FIFO Status */
	133	#define UFSTAT_Rx_FIFO_COUNT 0xff
	134	#define UFSTAT_Rx_FIFO_FULL 0x100
	135	#define UFSTAT_Rx_FIFO_ERROR 0x200
	136	#define UFSTAT_Tx_FIFO_COUNT_SHIFT 16
	137	#define UFSTAT_Tx_FIFO_COUNT (0xff << UFSTAT_Tx_FIFO_COUNT_SHIFT)
	138	#define UFSTAT_Tx_FIFO_FULL_SHIFT 24
	139	#define UFSTAT_Tx_FIFO_FULL (1 << UFSTAT_Tx_FIFO_FULL_SHIFT)
	140
	141	/* UART Interrupt Source Pending */
	142	#define UINTSP_RXD 0x1 /* Receive interrupt */
	143	#define UINTSP_ERROR 0x2 /* Error interrupt */
	144	#define UINTSP_TXD 0x4 /* Transmit interrupt */
	145	#define UINTSP_MODEM 0x8 /* Modem interrupt */
	146
	147	/* UART Line Control */
	148	#define ULCON_IR_MODE_SHIFT 6
	149	#define ULCON_PARITY_SHIFT 3
	150	#define ULCON_STOP_BIT_SHIFT 1
	151
	152	/* UART Tx/Rx Status */
	153	#define UTRSTAT_TRANSMITTER_EMPTY 0x4
	154	#define UTRSTAT_Tx_BUFFER_EMPTY 0x2
	155	#define UTRSTAT_Rx_BUFFER_DATA_READY 0x1
	156
	157	/* UART Error Status */
	158	#define UERSTAT_OVERRUN 0x1
	159	#define UERSTAT_PARITY 0x2
	160	#define UERSTAT_FRAME 0x4
	161	#define UERSTAT_BREAK 0x8
	162
	163	typedef struct {
164	uint8_t *data;
165	uint32_t sp, rp; /* store and retrieve pointers */
166	uint32_t size;
167	} Exynos4210UartFIFO;
168
61149ff6 AF	169	#define TYPE_EXYNOS4210_UART "exynos4210.uart"
	170	#define EXYNOS4210_UART(obj) \
	171	OBJECT_CHECK(Exynos4210UartState, (obj), TYPE_EXYNOS4210_UART)
	172
	173	typedef struct Exynos4210UartState {
	174	SysBusDevice parent_obj;
	175
e5a4914e MK	176	MemoryRegion iomem;
	177
	178	uint32_t reg[EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)];
	179	Exynos4210UartFIFO rx;
	180	Exynos4210UartFIFO tx;
	181
	182	CharDriverState *chr;
	183	qemu_irq irq;
	184
	185	uint32_t channel;
	186
	187	} Exynos4210UartState;
	188
	189
	190	#if DEBUG_UART
	191	/* Used only for debugging inside PRINT_DEBUG_... macros */
a8170e5e	192	static const char *exynos4210_uart_regname(hwaddr offset)
e5a4914e MK	193	{
e5a4914e MK	194
e5a4914e MK	195	int i;
e5a4914e MK	196
c46b07f0	197	for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) {
e5a4914e MK	198	if (offset == exynos4210_uart_regs[i].offset) {
	199	return exynos4210_uart_regs[i].name;
	200	}
	201	}
	202
	203	return NULL;
	204	}
	205	#endif
	206
	207
	208	static void fifo_store(Exynos4210UartFIFO *q, uint8_t ch)
	209	{
	210	q->data[q->sp] = ch;
	211	q->sp = (q->sp + 1) % q->size;
	212	}
	213
	214	static uint8_t fifo_retrieve(Exynos4210UartFIFO *q)
	215	{
	216	uint8_t ret = q->data[q->rp];
	217	q->rp = (q->rp + 1) % q->size;
	218	return ret;
	219	}
	220
	221	static int fifo_elements_number(Exynos4210UartFIFO *q)
	222	{
	223	if (q->sp < q->rp) {
	224	return q->size - q->rp + q->sp;
	225	}
	226
	227	return q->sp - q->rp;
	228	}
	229
	230	static int fifo_empty_elements_number(Exynos4210UartFIFO *q)
	231	{
	232	return q->size - fifo_elements_number(q);
	233	}
	234
	235	static void fifo_reset(Exynos4210UartFIFO *q)
	236	{
	237	if (q->data != NULL) {
	238	g_free(q->data);
	239	q->data = NULL;
	240	}
	241
	242	q->data = (uint8_t *)g_malloc0(q->size);
	243
	244	q->sp = 0;
	245	q->rp = 0;
	246	}
	247
	248	static uint32_t exynos4210_uart_Tx_FIFO_trigger_level(Exynos4210UartState *s)
	249	{
	250	uint32_t level = 0;
	251	uint32_t reg;
	252
b85f62d7	253	reg = (s->reg[I_(UFCON)] & UFCON_Tx_FIFO_TRIGGER_LEVEL) >>
e5a4914e MK	254	UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT;
	255
	256	switch (s->channel) {
	257	case 0:
	258	level = reg * 32;
	259	break;
	260	case 1:
	261	case 4:
	262	level = reg * 8;
	263	break;
	264	case 2:
	265	case 3:
	266	level = reg * 2;
	267	break;
	268	default:
	269	level = 0;
	270	PRINT_ERROR("Wrong UART channel number: %d\n", s->channel);
	271	}
	272
	273	return level;
	274	}
	275
	276	static void exynos4210_uart_update_irq(Exynos4210UartState *s)
	277	{
	278	/*
	279	* The Tx interrupt is always requested if the number of data in the
	280	* transmit FIFO is smaller than the trigger level.
	281	*/
b85f62d7	282	if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
e5a4914e	283
b85f62d7	284	uint32_t count = (s->reg[I_(UFSTAT)] & UFSTAT_Tx_FIFO_COUNT) >>
e5a4914e MK	285	UFSTAT_Tx_FIFO_COUNT_SHIFT;
	286
	287	if (count <= exynos4210_uart_Tx_FIFO_trigger_level(s)) {
	288	s->reg[I_(UINTSP)] \|= UINTSP_TXD;
	289	}
	290	}
	291
	292	s->reg[I_(UINTP)] = s->reg[I_(UINTSP)] & ~s->reg[I_(UINTM)];
	293
	294	if (s->reg[I_(UINTP)]) {
	295	qemu_irq_raise(s->irq);
	296
	297	#if DEBUG_IRQ
	298	fprintf(stderr, "UART%d: IRQ has been raised: %08x\n",
	299	s->channel, s->reg[I_(UINTP)]);
	300	#endif
	301
	302	} else {
	303	qemu_irq_lower(s->irq);
	304	}
	305	}
	306
	307	static void exynos4210_uart_update_parameters(Exynos4210UartState *s)
	308	{
	309	int speed, parity, data_bits, stop_bits, frame_size;
	310	QEMUSerialSetParams ssp;
	311	uint64_t uclk_rate;
	312
	313	if (s->reg[I_(UBRDIV)] == 0) {
	314	return;
	315	}
	316
	317	frame_size = 1; /* start bit */
	318	if (s->reg[I_(ULCON)] & 0x20) {
	319	frame_size++; /* parity bit */
	320	if (s->reg[I_(ULCON)] & 0x28) {
	321	parity = 'E';
	322	} else {
	323	parity = 'O';
	324	}
	325	} else {
	326	parity = 'N';
	327	}
	328
	329	if (s->reg[I_(ULCON)] & 0x4) {
	330	stop_bits = 2;
	331	} else {
	332	stop_bits = 1;
	333	}
	334
	335	data_bits = (s->reg[I_(ULCON)] & 0x3) + 5;
	336
	337	frame_size += data_bits + stop_bits;
	338
	339	uclk_rate = 24000000;
	340
	341	speed = uclk_rate / ((16 * (s->reg[I_(UBRDIV)]) & 0xffff) +
	342	(s->reg[I_(UFRACVAL)] & 0x7) + 16);
	343
	344	ssp.speed = speed;
	345	ssp.parity = parity;
	346	ssp.data_bits = data_bits;
	347	ssp.stop_bits = stop_bits;
	348
349	qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
350
351	PRINT_DEBUG("UART%d: speed: %d, parity: %c, data: %d, stop: %d\n",
352	s->channel, speed, parity, data_bits, stop_bits);
353	}
354
a8170e5e	355	static void exynos4210_uart_write(void *opaque, hwaddr offset,
e5a4914e MK	356	uint64_t val, unsigned size)
	357	{
	358	Exynos4210UartState s = (Exynos4210UartState )opaque;
	359	uint8_t ch;
	360
	361	PRINT_DEBUG_EXTEND("UART%d: <0x%04x> %s <- 0x%08llx\n", s->channel,
	362	offset, exynos4210_uart_regname(offset), (long long unsigned int)val);
	363
	364	switch (offset) {
	365	case ULCON:
	366	case UBRDIV:
	367	case UFRACVAL:
	368	s->reg[I_(offset)] = val;
	369	exynos4210_uart_update_parameters(s);
	370	break;
	371	case UFCON:
	372	s->reg[I_(UFCON)] = val;
	373	if (val & UFCON_Rx_FIFO_RESET) {
	374	fifo_reset(&s->rx);
	375	s->reg[I_(UFCON)] &= ~UFCON_Rx_FIFO_RESET;
	376	PRINT_DEBUG("UART%d: Rx FIFO Reset\n", s->channel);
	377	}
	378	if (val & UFCON_Tx_FIFO_RESET) {
	379	fifo_reset(&s->tx);
	380	s->reg[I_(UFCON)] &= ~UFCON_Tx_FIFO_RESET;
	381	PRINT_DEBUG("UART%d: Tx FIFO Reset\n", s->channel);
	382	}
	383	break;
	384
	385	case UTXH:
	386	if (s->chr) {
	387	s->reg[I_(UTRSTAT)] &= ~(UTRSTAT_TRANSMITTER_EMPTY \|
	388	UTRSTAT_Tx_BUFFER_EMPTY);
	389	ch = (uint8_t)val;
	390	qemu_chr_fe_write(s->chr, &ch, 1);
	391	#if DEBUG_Tx_DATA
	392	fprintf(stderr, "%c", ch);
	393	#endif
	394	s->reg[I_(UTRSTAT)] \|= UTRSTAT_TRANSMITTER_EMPTY \|
	395	UTRSTAT_Tx_BUFFER_EMPTY;
	396	s->reg[I_(UINTSP)] \|= UINTSP_TXD;
	397	exynos4210_uart_update_irq(s);
	398	}
	399	break;
	400
	401	case UINTP:
	402	s->reg[I_(UINTP)] &= ~val;
	403	s->reg[I_(UINTSP)] &= ~val;
	404	PRINT_DEBUG("UART%d: UINTP [%04x] have been cleared: %08x\n",
	405	s->channel, offset, s->reg[I_(UINTP)]);
	406	exynos4210_uart_update_irq(s);
	407	break;
	408	case UTRSTAT:
	409	case UERSTAT:
	410	case UFSTAT:
	411	case UMSTAT:
	412	case URXH:
	413	PRINT_DEBUG("UART%d: Trying to write into RO register: %s [%04x]\n",
	414	s->channel, exynos4210_uart_regname(offset), offset);
	415	break;
	416	case UINTSP:
	417	s->reg[I_(UINTSP)] &= ~val;
	418	break;
	419	case UINTM:
420	s->reg[I_(UINTM)] = val;
421	exynos4210_uart_update_irq(s);
422	break;
423	case UCON:
424	case UMCON:
425	default:
426	s->reg[I_(offset)] = val;
427	break;
428	}
429	}
a8170e5e	430	static uint64_t exynos4210_uart_read(void *opaque, hwaddr offset,
e5a4914e MK	431	unsigned size)
	432	{
	433	Exynos4210UartState s = (Exynos4210UartState )opaque;
	434	uint32_t res;
	435
	436	switch (offset) {
	437	case UERSTAT: /* Read Only */
	438	res = s->reg[I_(UERSTAT)];
	439	s->reg[I_(UERSTAT)] = 0;
	440	return res;
	441	case UFSTAT: /* Read Only */
	442	s->reg[I_(UFSTAT)] = fifo_elements_number(&s->rx) & 0xff;
	443	if (fifo_empty_elements_number(&s->rx) == 0) {
	444	s->reg[I_(UFSTAT)] \|= UFSTAT_Rx_FIFO_FULL;
	445	s->reg[I_(UFSTAT)] &= ~0xff;
	446	}
	447	return s->reg[I_(UFSTAT)];
	448	case URXH:
	449	if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
	450	if (fifo_elements_number(&s->rx)) {
	451	res = fifo_retrieve(&s->rx);
	452	#if DEBUG_Rx_DATA
	453	fprintf(stderr, "%c", res);
	454	#endif
	455	if (!fifo_elements_number(&s->rx)) {
	456	s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY;
	457	} else {
	458	s->reg[I_(UTRSTAT)] \|= UTRSTAT_Rx_BUFFER_DATA_READY;
	459	}
	460	} else {
	461	s->reg[I_(UINTSP)] \|= UINTSP_ERROR;
	462	exynos4210_uart_update_irq(s);
	463	res = 0;
	464	}
	465	} else {
	466	s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY;
	467	res = s->reg[I_(URXH)];
	468	}
	469	return res;
	470	case UTXH:
	471	PRINT_DEBUG("UART%d: Trying to read from WO register: %s [%04x]\n",
	472	s->channel, exynos4210_uart_regname(offset), offset);
	473	break;
	474	default:
	475	return s->reg[I_(offset)];
	476	}
	477
	478	return 0;
	479	}
	480
	481	static const MemoryRegionOps exynos4210_uart_ops = {
	482	.read = exynos4210_uart_read,
	483	.write = exynos4210_uart_write,
	484	.endianness = DEVICE_NATIVE_ENDIAN,
	485	.valid = {
	486	.max_access_size = 4,
	487	.unaligned = false
	488	},
	489	};
	490
	491	static int exynos4210_uart_can_receive(void *opaque)
	492	{
	493	Exynos4210UartState s = (Exynos4210UartState )opaque;
	494
495	return fifo_empty_elements_number(&s->rx);
496	}
497
498
499	static void exynos4210_uart_receive(void opaque, const uint8_t buf, int size)
500	{
501	Exynos4210UartState s = (Exynos4210UartState )opaque;
502	int i;
503
504	if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
505	if (fifo_empty_elements_number(&s->rx) < size) {
506	for (i = 0; i < fifo_empty_elements_number(&s->rx); i++) {
507	fifo_store(&s->rx, buf[i]);
508	}
509	s->reg[I_(UINTSP)] \|= UINTSP_ERROR;
510	s->reg[I_(UTRSTAT)] \|= UTRSTAT_Rx_BUFFER_DATA_READY;
511	} else {
512	for (i = 0; i < size; i++) {
513	fifo_store(&s->rx, buf[i]);
514	}
515	s->reg[I_(UTRSTAT)] \|= UTRSTAT_Rx_BUFFER_DATA_READY;
516	}
517	/* XXX: Around here we maybe should check Rx trigger level */
518	s->reg[I_(UINTSP)] \|= UINTSP_RXD;
519	} else {
520	s->reg[I_(URXH)] = buf[0];
521	s->reg[I_(UINTSP)] \|= UINTSP_RXD;
522	s->reg[I_(UTRSTAT)] \|= UTRSTAT_Rx_BUFFER_DATA_READY;
523	}
524
525	exynos4210_uart_update_irq(s);
526	}
527
528
529	static void exynos4210_uart_event(void *opaque, int event)
530	{
531	Exynos4210UartState s = (Exynos4210UartState )opaque;
532
533	if (event == CHR_EVENT_BREAK) {
534	/* When the RxDn is held in logic 0, then a null byte is pushed into the
535	* fifo */
536	fifo_store(&s->rx, '\0');
537	s->reg[I_(UERSTAT)] \|= UERSTAT_BREAK;
538	exynos4210_uart_update_irq(s);
539	}
540	}
541
542
543	static void exynos4210_uart_reset(DeviceState *dev)
544	{
61149ff6	545	Exynos4210UartState *s = EXYNOS4210_UART(dev);
e5a4914e MK	546	int i;
e5a4914e MK	547
c46b07f0	548	for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) {
e5a4914e MK	549	s->reg[I_(exynos4210_uart_regs[i].offset)] =
	550	exynos4210_uart_regs[i].reset_value;
	551	}
	552
	553	fifo_reset(&s->rx);
	554	fifo_reset(&s->tx);
	555
	556	PRINT_DEBUG("UART%d: Rx FIFO size: %d\n", s->channel, s->rx.size);
	557	}
	558
	559	static const VMStateDescription vmstate_exynos4210_uart_fifo = {
	560	.name = "exynos4210.uart.fifo",
	561	.version_id = 1,
	562	.minimum_version_id = 1,
e5a4914e MK	563	.fields = (VMStateField[]) {
	564	VMSTATE_UINT32(sp, Exynos4210UartFIFO),
	565	VMSTATE_UINT32(rp, Exynos4210UartFIFO),
	566	VMSTATE_VBUFFER_UINT32(data, Exynos4210UartFIFO, 1, NULL, 0, size),
	567	VMSTATE_END_OF_LIST()
	568	}
	569	};
	570
	571	static const VMStateDescription vmstate_exynos4210_uart = {
	572	.name = "exynos4210.uart",
	573	.version_id = 1,
	574	.minimum_version_id = 1,
e5a4914e MK	575	.fields = (VMStateField[]) {
	576	VMSTATE_STRUCT(rx, Exynos4210UartState, 1,
	577	vmstate_exynos4210_uart_fifo, Exynos4210UartFIFO),
	578	VMSTATE_UINT32_ARRAY(reg, Exynos4210UartState,
	579	EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)),
	580	VMSTATE_END_OF_LIST()
	581	}
	582	};
	583
a8170e5e	584	DeviceState *exynos4210_uart_create(hwaddr addr,
61149ff6 AF	585	int fifo_size,
	586	int channel,
	587	CharDriverState *chr,
	588	qemu_irq irq)
e5a4914e MK	589	{
	590	DeviceState *dev;
	591	SysBusDevice *bus;
	592
	593	const char chr_name[] = "serial";
	594	char label[ARRAY_SIZE(chr_name) + 1];
	595
61149ff6	596	dev = qdev_create(NULL, TYPE_EXYNOS4210_UART);
e5a4914e MK	597
	598	if (!chr) {
	599	if (channel >= MAX_SERIAL_PORTS) {
	600	hw_error("Only %d serial ports are supported by QEMU.\n",
	601	MAX_SERIAL_PORTS);
	602	}
	603	chr = serial_hds[channel];
	604	if (!chr) {
	605	snprintf(label, ARRAY_SIZE(label), "%s%d", chr_name, channel);
	606	chr = qemu_chr_new(label, "null", NULL);
	607	if (!(chr)) {
	608	hw_error("Can't assign serial port to UART%d.\n", channel);
	609	}
	610	}
	611	}
	612
	613	qdev_prop_set_chr(dev, "chardev", chr);
	614	qdev_prop_set_uint32(dev, "channel", channel);
	615	qdev_prop_set_uint32(dev, "rx-size", fifo_size);
	616	qdev_prop_set_uint32(dev, "tx-size", fifo_size);
	617
1356b98d	618	bus = SYS_BUS_DEVICE(dev);
e5a4914e	619	qdev_init_nofail(dev);
a8170e5e	620	if (addr != (hwaddr)-1) {
e5a4914e MK	621	sysbus_mmio_map(bus, 0, addr);
	622	}
	623	sysbus_connect_irq(bus, 0, irq);
	624
	625	return dev;
	626	}
	627
	628	static int exynos4210_uart_init(SysBusDevice *dev)
	629	{
61149ff6	630	Exynos4210UartState *s = EXYNOS4210_UART(dev);
e5a4914e MK	631
e5a4914e MK	632	/* memory mapping */
300b1fc6 PB	633	memory_region_init_io(&s->iomem, OBJECT(s), &exynos4210_uart_ops, s,
300b1fc6 PB	634	"exynos4210.uart", EXYNOS4210_UART_REGS_MEM_SIZE);
e5a4914e MK	635	sysbus_init_mmio(dev, &s->iomem);
	636
	637	sysbus_init_irq(dev, &s->irq);
	638
	639	qemu_chr_add_handlers(s->chr, exynos4210_uart_can_receive,
	640	exynos4210_uart_receive, exynos4210_uart_event, s);
	641
	642	return 0;
	643	}
	644
	645	static Property exynos4210_uart_properties[] = {
	646	DEFINE_PROP_CHR("chardev", Exynos4210UartState, chr),
	647	DEFINE_PROP_UINT32("channel", Exynos4210UartState, channel, 0),
	648	DEFINE_PROP_UINT32("rx-size", Exynos4210UartState, rx.size, 16),
	649	DEFINE_PROP_UINT32("tx-size", Exynos4210UartState, tx.size, 16),
	650	DEFINE_PROP_END_OF_LIST(),
	651	};
	652
	653	static void exynos4210_uart_class_init(ObjectClass klass, void data)
	654	{
	655	DeviceClass *dc = DEVICE_CLASS(klass);
	656	SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
	657
	658	k->init = exynos4210_uart_init;
	659	dc->reset = exynos4210_uart_reset;
	660	dc->props = exynos4210_uart_properties;
	661	dc->vmsd = &vmstate_exynos4210_uart;
	662	}
	663
8c43a6f0	664	static const TypeInfo exynos4210_uart_info = {
61149ff6	665	.name = TYPE_EXYNOS4210_UART,
e5a4914e MK	666	.parent = TYPE_SYS_BUS_DEVICE,
	667	.instance_size = sizeof(Exynos4210UartState),
	668	.class_init = exynos4210_uart_class_init,
	669	};
	670
	671	static void exynos4210_uart_register(void)
	672	{
	673	type_register_static(&exynos4210_uart_info);
	674	}
	675
	676	type_init(exynos4210_uart_register)