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/*

 * Motorola ColdFire MCF5206 SoC embedded peripheral emulation.

 *

 * Copyright (c) 2007 CodeSourcery.

 *

 * This code is licensed under the GPL

 */

#include "hw.h"

#include "mcf.h"

#include "qemu-timer.h"

#include "ptimer.h"

#include "sysemu.h"

#include "exec-memory.h"

/* General purpose timer module.  */

typedef struct {

    uint16_t tmr;

    uint16_t trr;

    uint16_t tcr;

    uint16_t ter;

    ptimer_state *timer;

    qemu_irq irq;

    int irq_state;

} m5206_timer_state;

#define TMR_RST 0x01

#define TMR_CLK 0x06

#define TMR_FRR 0x08

#define TMR_ORI 0x10

#define TMR_OM  0x20

#define TMR_CE  0xc0

#define TER_CAP 0x01

#define TER_REF 0x02

static void m5206_timer_update(m5206_timer_state *s)

{

    if ((s->tmr & TMR_ORI) != 0 && (s->ter & TER_REF))

        qemu_irq_raise(s->irq);

    else

        qemu_irq_lower(s->irq);

}

static void m5206_timer_reset(m5206_timer_state *s)

{

    s->tmr = 0;

    s->trr = 0;

}

static void m5206_timer_recalibrate(m5206_timer_state *s)

{

    int prescale;

    int mode;

    ptimer_stop(s->timer);

    if ((s->tmr & TMR_RST) == 0)

        return;

    prescale = (s->tmr >> 8) + 1;

    mode = (s->tmr >> 1) & 3;

    if (mode == 2)

        prescale *= 16;

    if (mode == 3 || mode == 0)

        hw_error("m5206_timer: mode %d not implemented\n", mode);

    if ((s->tmr & TMR_FRR) == 0)

        hw_error("m5206_timer: free running mode not implemented\n");

    /* Assume 66MHz system clock.  */

    ptimer_set_freq(s->timer, 66000000 / prescale);

    ptimer_set_limit(s->timer, s->trr, 0);

    ptimer_run(s->timer, 0);

}

static void m5206_timer_trigger(void *opaque)

{

    m5206_timer_state *s = (m5206_timer_state *)opaque;

    s->ter |= TER_REF;

    m5206_timer_update(s);

}

static uint32_t m5206_timer_read(m5206_timer_state *s, uint32_t addr)

{

    switch (addr) {

    case 0:

        return s->tmr;

    case 4:

        return s->trr;

    case 8:

        return s->tcr;

    case 0xc:

        return s->trr - ptimer_get_count(s->timer);

    case 0x11:

        return s->ter;

    default:

        return 0;

    }

}

static void m5206_timer_write(m5206_timer_state *s, uint32_t addr, uint32_t val)

{

    switch (addr) {

    case 0:

        if ((s->tmr & TMR_RST) != 0 && (val & TMR_RST) == 0) {

            m5206_timer_reset(s);

        }

        s->tmr = val;

        m5206_timer_recalibrate(s);

        break;

    case 4:

        s->trr = val;

        m5206_timer_recalibrate(s);

        break;

    case 8:

        s->tcr = val;

        break;

    case 0xc:

        ptimer_set_count(s->timer, val);

        break;

    case 0x11:

        s->ter &= ~val;

        break;

    default:

        break;

    }

    m5206_timer_update(s);

}

static m5206_timer_state *m5206_timer_init(qemu_irq irq)

{

    m5206_timer_state *s;

    QEMUBH *bh;

    s = (m5206_timer_state *)g_malloc0(sizeof(m5206_timer_state));

    bh = qemu_bh_new(m5206_timer_trigger, s);

    s->timer = ptimer_init(bh);

    s->irq = irq;

    m5206_timer_reset(s);

    return s;

}

/* System Integration Module.  */

typedef struct {

    CPUM68KState *env;

    MemoryRegion iomem;

    m5206_timer_state *timer[2];

    void *uart[2];

    uint8_t scr;

    uint8_t icr[14];

    uint16_t imr; /* 1 == interrupt is masked.  */

    uint16_t ipr;

    uint8_t rsr;

    uint8_t swivr;

    uint8_t par;

    /* Include the UART vector registers here.  */

    uint8_t uivr[2];

} m5206_mbar_state;

/* Interrupt controller.  */

static int m5206_find_pending_irq(m5206_mbar_state *s)

{

    int level;

    int vector;

    uint16_t active;

    int i;

    level = 0;

    vector = 0;

    active = s->ipr & ~s->imr;

    if (!active)

        return 0;

    for (i = 1; i < 14; i++) {

        if (active & (1 << i)) {

            if ((s->icr[i] & 0x1f) > level) {

                level = s->icr[i] & 0x1f;

                vector = i;

            }

        }

    }

    if (level < 4)

        vector = 0;

    return vector;

}

static void m5206_mbar_update(m5206_mbar_state *s)

{

    int irq;

    int vector;

    int level;

    irq = m5206_find_pending_irq(s);

    if (irq) {

        int tmp;

        tmp = s->icr[irq];

        level = (tmp >> 2) & 7;

        if (tmp & 0x80) {

            /* Autovector.  */

            vector = 24 + level;

        } else {

            switch (irq) {

            case 8: /* SWT */

                vector = s->swivr;

                break;

            case 12: /* UART1 */

                vector = s->uivr[0];

                break;

            case 13: /* UART2 */

                vector = s->uivr[1];

                break;

            default:

                /* Unknown vector.  */

                fprintf(stderr, "Unhandled vector for IRQ %d\n", irq);

                vector = 0xf;

                break;

            }

        }

    } else {

        level = 0;

        vector = 0;

    }

    m68k_set_irq_level(s->env, level, vector);

}

static void m5206_mbar_set_irq(void *opaque, int irq, int level)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    if (level) {

        s->ipr |= 1 << irq;

    } else {

        s->ipr &= ~(1 << irq);

    }

    m5206_mbar_update(s);

}

/* System Integration Module.  */

static void m5206_mbar_reset(m5206_mbar_state *s)

{

    s->scr = 0xc0;

    s->icr[1] = 0x04;

    s->icr[2] = 0x08;

    s->icr[3] = 0x0c;

    s->icr[4] = 0x10;

    s->icr[5] = 0x14;

    s->icr[6] = 0x18;

    s->icr[7] = 0x1c;

    s->icr[8] = 0x1c;

    s->icr[9] = 0x80;

    s->icr[10] = 0x80;

    s->icr[11] = 0x80;

    s->icr[12] = 0x00;

    s->icr[13] = 0x00;

    s->imr = 0x3ffe;

    s->rsr = 0x80;

    s->swivr = 0x0f;

    s->par = 0;

}

static uint64_t m5206_mbar_read(m5206_mbar_state *s,

                                uint64_t offset, unsigned size)

{

    if (offset >= 0x100 && offset < 0x120) {

        return m5206_timer_read(s->timer[0], offset - 0x100);

    } else if (offset >= 0x120 && offset < 0x140) {

        return m5206_timer_read(s->timer[1], offset - 0x120);

    } else if (offset >= 0x140 && offset < 0x160) {

        return mcf_uart_read(s->uart[0], offset - 0x140, size);

    } else if (offset >= 0x180 && offset < 0x1a0) {

        return mcf_uart_read(s->uart[1], offset - 0x180, size);

    }

    switch (offset) {

    case 0x03: return s->scr;

    case 0x14 ... 0x20: return s->icr[offset - 0x13];

    case 0x36: return s->imr;

    case 0x3a: return s->ipr;

    case 0x40: return s->rsr;

    case 0x41: return 0;

    case 0x42: return s->swivr;

    case 0x50:

        /* DRAM mask register.  */

        /* FIXME: currently hardcoded to 128Mb.  */

        {

            uint32_t mask = ~0;

            while (mask > ram_size)

                mask >>= 1;

            return mask & 0x0ffe0000;

        }

    case 0x5c: return 1; /* DRAM bank 1 empty.  */

    case 0xcb: return s->par;

    case 0x170: return s->uivr[0];

    case 0x1b0: return s->uivr[1];

    }

    hw_error("Bad MBAR read offset 0x%x", (int)offset);

    return 0;

}

static void m5206_mbar_write(m5206_mbar_state *s, uint32_t offset,

                             uint64_t value, unsigned size)

{

    if (offset >= 0x100 && offset < 0x120) {

        m5206_timer_write(s->timer[0], offset - 0x100, value);

        return;

    } else if (offset >= 0x120 && offset < 0x140) {

        m5206_timer_write(s->timer[1], offset - 0x120, value);

        return;

    } else if (offset >= 0x140 && offset < 0x160) {

        mcf_uart_write(s->uart[0], offset - 0x140, value, size);

        return;

    } else if (offset >= 0x180 && offset < 0x1a0) {

        mcf_uart_write(s->uart[1], offset - 0x180, value, size);

        return;

    }

    switch (offset) {

    case 0x03:

        s->scr = value;

        break;

    case 0x14 ... 0x20:

        s->icr[offset - 0x13] = value;

        m5206_mbar_update(s);

        break;

    case 0x36:

        s->imr = value;

        m5206_mbar_update(s);

        break;

    case 0x40:

        s->rsr &= ~value;

        break;

    case 0x41:

        /* TODO: implement watchdog.  */

        break;

    case 0x42:

        s->swivr = value;

        break;

    case 0xcb:

        s->par = value;

        break;

    case 0x170:

        s->uivr[0] = value;

        break;

    case 0x178: case 0x17c: case 0x1c8: case 0x1bc:

        /* Not implemented: UART Output port bits.  */

        break;

    case 0x1b0:

        s->uivr[1] = value;

        break;

    default:

        hw_error("Bad MBAR write offset 0x%x", (int)offset);

        break;

    }

}

/* Internal peripherals use a variety of register widths.

   This lookup table allows a single routine to handle all of them.  */

static const int m5206_mbar_width[] =

{

  /* 000-040 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  2, 2, 2, 2,

  /* 040-080 */ 1, 2, 2, 2,  4, 1, 2, 4,  1, 2, 4, 2,  2, 4, 2, 2,

  /* 080-0c0 */ 4, 2, 2, 4,  2, 2, 4, 2,  2, 4, 2, 2,  4, 2, 2, 4,

  /* 0c0-100 */ 2, 2, 1, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,

  /* 100-140 */ 2, 2, 2, 2,  1, 0, 0, 0,  2, 2, 2, 2,  1, 0, 0, 0,

  /* 140-180 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,

  /* 180-1c0 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,

  /* 1c0-200 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,

};

static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset);

static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset);

static uint32_t m5206_mbar_readb(void *opaque, hwaddr offset)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    offset &= 0x3ff;

    if (offset >= 0x200) {

        hw_error("Bad MBAR read offset 0x%x", (int)offset);

    }

    if (m5206_mbar_width[offset >> 2] > 1) {

        uint16_t val;

        val = m5206_mbar_readw(opaque, offset & ~1);

        if ((offset & 1) == 0) {

            val >>= 8;

        }

        return val & 0xff;

    }

    return m5206_mbar_read(s, offset, 1);

}

static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    int width;

    offset &= 0x3ff;

    if (offset >= 0x200) {

        hw_error("Bad MBAR read offset 0x%x", (int)offset);

    }

    width = m5206_mbar_width[offset >> 2];

    if (width > 2) {

        uint32_t val;

        val = m5206_mbar_readl(opaque, offset & ~3);

        if ((offset & 3) == 0)

            val >>= 16;

        return val & 0xffff;

    } else if (width < 2) {

        uint16_t val;

        val = m5206_mbar_readb(opaque, offset) << 8;

        val |= m5206_mbar_readb(opaque, offset + 1);

        return val;

    }

    return m5206_mbar_read(s, offset, 2);

}

static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    int width;

    offset &= 0x3ff;

    if (offset >= 0x200) {

        hw_error("Bad MBAR read offset 0x%x", (int)offset);

    }

    width = m5206_mbar_width[offset >> 2];

    if (width < 4) {

        uint32_t val;

        val = m5206_mbar_readw(opaque, offset) << 16;

        val |= m5206_mbar_readw(opaque, offset + 2);

        return val;

    }

    return m5206_mbar_read(s, offset, 4);

}

static void m5206_mbar_writew(void *opaque, hwaddr offset,

                              uint32_t value);

static void m5206_mbar_writel(void *opaque, hwaddr offset,

                              uint32_t value);

static void m5206_mbar_writeb(void *opaque, hwaddr offset,

                              uint32_t value)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    int width;

    offset &= 0x3ff;

    if (offset >= 0x200) {

        hw_error("Bad MBAR write offset 0x%x", (int)offset);

    }

    width = m5206_mbar_width[offset >> 2];

    if (width > 1) {

        uint32_t tmp;

        tmp = m5206_mbar_readw(opaque, offset & ~1);

        if (offset & 1) {

            tmp = (tmp & 0xff00) | value;

        } else {

            tmp = (tmp & 0x00ff) | (value << 8);

        }

        m5206_mbar_writew(opaque, offset & ~1, tmp);

        return;

    }

    m5206_mbar_write(s, offset, value, 1);

}

static void m5206_mbar_writew(void *opaque, hwaddr offset,

                              uint32_t value)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    int width;

    offset &= 0x3ff;

    if (offset >= 0x200) {

        hw_error("Bad MBAR write offset 0x%x", (int)offset);

    }

    width = m5206_mbar_width[offset >> 2];

    if (width > 2) {

        uint32_t tmp;

        tmp = m5206_mbar_readl(opaque, offset & ~3);

        if (offset & 3) {

            tmp = (tmp & 0xffff0000) | value;

        } else {

            tmp = (tmp & 0x0000ffff) | (value << 16);

        }

        m5206_mbar_writel(opaque, offset & ~3, tmp);

        return;

    } else if (width < 2) {

        m5206_mbar_writeb(opaque, offset, value >> 8);

        m5206_mbar_writeb(opaque, offset + 1, value & 0xff);

        return;

    }

    m5206_mbar_write(s, offset, value, 2);

}

static void m5206_mbar_writel(void *opaque, hwaddr offset,

                              uint32_t value)

{

    m5206_mbar_state *s = (m5206_mbar_state *)opaque;

    int width;

    offset &= 0x3ff;

    if (offset >= 0x200) {

        hw_error("Bad MBAR write offset 0x%x", (int)offset);

    }

    width = m5206_mbar_width[offset >> 2];

    if (width < 4) {

        m5206_mbar_writew(opaque, offset, value >> 16);

        m5206_mbar_writew(opaque, offset + 2, value & 0xffff);

        return;

    }

    m5206_mbar_write(s, offset, value, 4);

}

static const MemoryRegionOps m5206_mbar_ops = {

    .old_mmio = {

        .read = {

            m5206_mbar_readb,

            m5206_mbar_readw,

            m5206_mbar_readl,

        },

        .write = {

            m5206_mbar_writeb,

            m5206_mbar_writew,

            m5206_mbar_writel,

        },

    },

    .endianness = DEVICE_NATIVE_ENDIAN,

};

qemu_irq *mcf5206_init(MemoryRegion *sysmem, uint32_t base, CPUM68KState *env)

{

    m5206_mbar_state *s;

    qemu_irq *pic;

    s = (m5206_mbar_state *)g_malloc0(sizeof(m5206_mbar_state));

    memory_region_init_io(&s->iomem, &m5206_mbar_ops, s,

                          "mbar", 0x00001000);

    memory_region_add_subregion(sysmem, base, &s->iomem);

    pic = qemu_allocate_irqs(m5206_mbar_set_irq, s, 14);

    s->timer[0] = m5206_timer_init(pic[9]);

    s->timer[1] = m5206_timer_init(pic[10]);

    s->uart[0] = mcf_uart_init(pic[12], serial_hds[0]);

    s->uart[1] = mcf_uart_init(pic[13], serial_hds[1]);

    s->env = env;

    m5206_mbar_reset(s);

    return pic;

}