Archipelago » qemu

/*

 * Marvell MV88W8618 / Freecom MusicPal emulation.

 *

 * Copyright (c) 2008 Jan Kiszka

 *

 * This code is licenced under the GNU GPL v2.

 */

#include "hw.h"

#include "arm-misc.h"

#include "devices.h"

#include "net.h"

#include "sysemu.h"

#include "boards.h"

#include "pc.h"

#include "qemu-timer.h"

#include "block.h"

#include "flash.h"

#include "console.h"

#include "audio/audio.h"

#include "i2c.h"

#define MP_ETH_BASE             0x80008000

#define MP_ETH_SIZE             0x00001000

#define MP_UART1_BASE           0x8000C840

#define MP_UART2_BASE           0x8000C940

#define MP_FLASHCFG_BASE        0x90006000

#define MP_FLASHCFG_SIZE        0x00001000

#define MP_AUDIO_BASE           0x90007000

#define MP_AUDIO_SIZE           0x00001000

#define MP_PIC_BASE             0x90008000

#define MP_PIC_SIZE             0x00001000

#define MP_PIT_BASE             0x90009000

#define MP_PIT_SIZE             0x00001000

#define MP_LCD_BASE             0x9000c000

#define MP_LCD_SIZE             0x00001000

#define MP_SRAM_BASE            0xC0000000

#define MP_SRAM_SIZE            0x00020000

#define MP_RAM_DEFAULT_SIZE     32*1024*1024

#define MP_FLASH_SIZE_MAX       32*1024*1024

#define MP_TIMER1_IRQ           4

/* ... */

#define MP_TIMER4_IRQ           7

#define MP_EHCI_IRQ             8

#define MP_ETH_IRQ              9

#define MP_UART1_IRQ            11

#define MP_UART2_IRQ            11

#define MP_GPIO_IRQ             12

#define MP_RTC_IRQ              28

#define MP_AUDIO_IRQ            30

static uint32_t gpio_in_state = 0xffffffff;

static uint32_t gpio_isr;

static uint32_t gpio_out_state;

static ram_addr_t sram_off;

/* Address conversion helpers */

static void *target2host_addr(uint32_t addr)

{

    if (addr < MP_SRAM_BASE) {

        if (addr >= MP_RAM_DEFAULT_SIZE)

            return NULL;

        return (void *)(phys_ram_base + addr);

    } else {

        if (addr >= MP_SRAM_BASE + MP_SRAM_SIZE)

            return NULL;

        return (void *)(phys_ram_base + sram_off + addr - MP_SRAM_BASE);

    }

}

static uint32_t host2target_addr(void *addr)

{

    if (addr < ((void *)phys_ram_base) + sram_off)

        return (unsigned long)addr - (unsigned long)phys_ram_base;

    else

        return (unsigned long)addr - (unsigned long)phys_ram_base -

            sram_off + MP_SRAM_BASE;

}

typedef enum i2c_state {

    STOPPED = 0,

    INITIALIZING,

    SENDING_BIT7,

    SENDING_BIT6,

    SENDING_BIT5,

    SENDING_BIT4,

    SENDING_BIT3,

    SENDING_BIT2,

    SENDING_BIT1,

    SENDING_BIT0,

    WAITING_FOR_ACK,

    RECEIVING_BIT7,

    RECEIVING_BIT6,

    RECEIVING_BIT5,

    RECEIVING_BIT4,

    RECEIVING_BIT3,

    RECEIVING_BIT2,

    RECEIVING_BIT1,

    RECEIVING_BIT0,

    SENDING_ACK

} i2c_state;

typedef struct i2c_interface {

    i2c_bus *bus;

    i2c_state state;

    int last_data;

    int last_clock;

    uint8_t buffer;

    int current_addr;

} i2c_interface;

static void i2c_enter_stop(i2c_interface *i2c)

{

    if (i2c->current_addr >= 0)

        i2c_end_transfer(i2c->bus);

    i2c->current_addr = -1;

    i2c->state = STOPPED;

}

static void i2c_state_update(i2c_interface *i2c, int data, int clock)

{

    if (!i2c)

        return;

    switch (i2c->state) {

    case STOPPED:

        if (data == 0 && i2c->last_data == 1 && clock == 1)

            i2c->state = INITIALIZING;

        break;

    case INITIALIZING:

        if (clock == 0 && i2c->last_clock == 1 && data == 0)

            i2c->state = SENDING_BIT7;

        else

            i2c_enter_stop(i2c);

        break;

    case SENDING_BIT7 ... SENDING_BIT0:

        if (clock == 0 && i2c->last_clock == 1) {

            i2c->buffer = (i2c->buffer << 1) | data;

            i2c->state++; /* will end up in WAITING_FOR_ACK */

        } else if (data == 1 && i2c->last_data == 0 && clock == 1)

            i2c_enter_stop(i2c);

        break;

    case WAITING_FOR_ACK:

        if (clock == 0 && i2c->last_clock == 1) {

            if (i2c->current_addr < 0) {

                i2c->current_addr = i2c->buffer;

                i2c_start_transfer(i2c->bus, i2c->current_addr & 0xfe,

                                   i2c->buffer & 1);

            } else

                i2c_send(i2c->bus, i2c->buffer);

            if (i2c->current_addr & 1) {

                i2c->state = RECEIVING_BIT7;

                i2c->buffer = i2c_recv(i2c->bus);

            } else

                i2c->state = SENDING_BIT7;

        } else if (data == 1 && i2c->last_data == 0 && clock == 1)

            i2c_enter_stop(i2c);

        break;

    case RECEIVING_BIT7 ... RECEIVING_BIT0:

        if (clock == 0 && i2c->last_clock == 1) {

            i2c->state++; /* will end up in SENDING_ACK */

            i2c->buffer <<= 1;

        } else if (data == 1 && i2c->last_data == 0 && clock == 1)

            i2c_enter_stop(i2c);

        break;

    case SENDING_ACK:

        if (clock == 0 && i2c->last_clock == 1) {

            i2c->state = RECEIVING_BIT7;

            if (data == 0)

                i2c->buffer = i2c_recv(i2c->bus);

            else

                i2c_nack(i2c->bus);

        } else if (data == 1 && i2c->last_data == 0 && clock == 1)

            i2c_enter_stop(i2c);

        break;

    }

    i2c->last_data = data;

    i2c->last_clock = clock;

}

static int i2c_get_data(i2c_interface *i2c)

{

    if (!i2c)

        return 0;

    switch (i2c->state) {

    case RECEIVING_BIT7 ... RECEIVING_BIT0:

        return (i2c->buffer >> 7);

    case WAITING_FOR_ACK:

    default:

        return 0;

    }

}

static i2c_interface *mixer_i2c;

#ifdef HAS_AUDIO

/* Audio register offsets */

#define MP_AUDIO_PLAYBACK_MODE  0x00

#define MP_AUDIO_CLOCK_DIV      0x18

#define MP_AUDIO_IRQ_STATUS     0x20

#define MP_AUDIO_IRQ_ENABLE     0x24

#define MP_AUDIO_TX_START_LO    0x28

#define MP_AUDIO_TX_THRESHOLD   0x2C

#define MP_AUDIO_TX_STATUS      0x38

#define MP_AUDIO_TX_START_HI    0x40

/* Status register and IRQ enable bits */

#define MP_AUDIO_TX_HALF        (1 << 6)

#define MP_AUDIO_TX_FULL        (1 << 7)

/* Playback mode bits */

#define MP_AUDIO_16BIT_SAMPLE   (1 << 0)

#define MP_AUDIO_PLAYBACK_EN    (1 << 7)

#define MP_AUDIO_CLOCK_24MHZ    (1 << 9)

#define MP_AUDIO_MONO           (1 << 14)

/* Wolfson 8750 I2C address */

#define MP_WM_ADDR              0x34

static const char audio_name[] = "mv88w8618";

typedef struct musicpal_audio_state {

    qemu_irq irq;

    uint32_t playback_mode;

    uint32_t status;

    uint32_t irq_enable;

    unsigned long phys_buf;

    int8_t *target_buffer;

    unsigned int threshold;

    unsigned int play_pos;

    unsigned int last_free;

    uint32_t clock_div;

    i2c_slave *wm;

} musicpal_audio_state;

static void audio_callback(void *opaque, int free_out, int free_in)

{

    musicpal_audio_state *s = opaque;

    int16_t *codec_buffer;

    int8_t *mem_buffer;

    int pos, block_size;

    if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN))

        return;

    if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE)

        free_out <<= 1;

    if (!(s->playback_mode & MP_AUDIO_MONO))

        free_out <<= 1;

    block_size = s->threshold/2;

    if (free_out - s->last_free < block_size)

        return;

    mem_buffer = s->target_buffer + s->play_pos;

    if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {

        if (s->playback_mode & MP_AUDIO_MONO) {

            codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);

            for (pos = 0; pos < block_size; pos += 2) {

                *codec_buffer++ = *(int16_t *)mem_buffer;

                *codec_buffer++ = *(int16_t *)mem_buffer;

                mem_buffer += 2;

            }

        } else

            memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),

                   (uint32_t *)mem_buffer, block_size);

    } else {

        if (s->playback_mode & MP_AUDIO_MONO) {

            codec_buffer = wm8750_dac_buffer(s->wm, block_size);

            for (pos = 0; pos < block_size; pos++) {

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer);

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);

            }

        } else {

            codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);

            for (pos = 0; pos < block_size; pos += 2) {

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);

            }

        }

    }

    wm8750_dac_commit(s->wm);

    s->last_free = free_out - block_size;

    if (s->play_pos == 0) {

        s->status |= MP_AUDIO_TX_HALF;

        s->play_pos = block_size;

    } else {

        s->status |= MP_AUDIO_TX_FULL;

        s->play_pos = 0;

    }

    if (s->status & s->irq_enable)

        qemu_irq_raise(s->irq);

}

static void musicpal_audio_clock_update(musicpal_audio_state *s)

{

    int rate;

    if (s->playback_mode & MP_AUDIO_CLOCK_24MHZ)

        rate = 24576000 / 64; /* 24.576MHz */

    else

        rate = 11289600 / 64; /* 11.2896MHz */

    rate /= ((s->clock_div >> 8) & 0xff) + 1;

    wm8750_set_bclk_in(s->wm, rate);

}

static uint32_t musicpal_audio_read(void *opaque, target_phys_addr_t offset)

{

    musicpal_audio_state *s = opaque;

    switch (offset) {

    case MP_AUDIO_PLAYBACK_MODE:

        return s->playback_mode;

    case MP_AUDIO_CLOCK_DIV:

        return s->clock_div;

    case MP_AUDIO_IRQ_STATUS:

        return s->status;

    case MP_AUDIO_IRQ_ENABLE:

        return s->irq_enable;

    case MP_AUDIO_TX_STATUS:

        return s->play_pos >> 2;

    default:

        return 0;

    }

}

static void musicpal_audio_write(void *opaque, target_phys_addr_t offset,

                                 uint32_t value)

{

    musicpal_audio_state *s = opaque;

    switch (offset) {

    case MP_AUDIO_PLAYBACK_MODE:

        if (value & MP_AUDIO_PLAYBACK_EN &&

            !(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {

            s->status = 0;

            s->last_free = 0;

            s->play_pos = 0;

        }

        s->playback_mode = value;

        musicpal_audio_clock_update(s);

        break;

    case MP_AUDIO_CLOCK_DIV:

        s->clock_div = value;

        s->last_free = 0;

        s->play_pos = 0;

        musicpal_audio_clock_update(s);

        break;

    case MP_AUDIO_IRQ_STATUS:

        s->status &= ~value;

        break;

    case MP_AUDIO_IRQ_ENABLE:

        s->irq_enable = value;

        if (s->status & s->irq_enable)

            qemu_irq_raise(s->irq);

        break;

    case MP_AUDIO_TX_START_LO:

        s->phys_buf = (s->phys_buf & 0xFFFF0000) | (value & 0xFFFF);

        s->target_buffer = target2host_addr(s->phys_buf);

        s->play_pos = 0;

        s->last_free = 0;

        break;

    case MP_AUDIO_TX_THRESHOLD:

        s->threshold = (value + 1) * 4;

        break;

    case MP_AUDIO_TX_START_HI:

        s->phys_buf = (s->phys_buf & 0xFFFF) | (value << 16);

        s->target_buffer = target2host_addr(s->phys_buf);

        s->play_pos = 0;

        s->last_free = 0;

        break;

    }

}

static void musicpal_audio_reset(void *opaque)

{

    musicpal_audio_state *s = opaque;

    s->playback_mode = 0;

    s->status = 0;

    s->irq_enable = 0;

}

static CPUReadMemoryFunc *musicpal_audio_readfn[] = {

    musicpal_audio_read,

    musicpal_audio_read,

    musicpal_audio_read

};

static CPUWriteMemoryFunc *musicpal_audio_writefn[] = {

    musicpal_audio_write,

    musicpal_audio_write,

    musicpal_audio_write

};

static i2c_interface *musicpal_audio_init(uint32_t base, qemu_irq irq)

{

    AudioState *audio;

    musicpal_audio_state *s;

    i2c_interface *i2c;

    int iomemtype;

    audio = AUD_init();

    if (!audio) {

        AUD_log(audio_name, "No audio state\n");

        return NULL;

    }

    s = qemu_mallocz(sizeof(musicpal_audio_state));

    if (!s)

        return NULL;

    s->irq = irq;

    i2c = qemu_mallocz(sizeof(i2c_interface));

    if (!i2c)

        return NULL;

    i2c->bus = i2c_init_bus();

    i2c->current_addr = -1;

    s->wm = wm8750_init(i2c->bus, audio);

    if (!s->wm)

        return NULL;

    i2c_set_slave_address(s->wm, MP_WM_ADDR);

    wm8750_data_req_set(s->wm, audio_callback, s);

    iomemtype = cpu_register_io_memory(0, musicpal_audio_readfn,

                       musicpal_audio_writefn, s);

    cpu_register_physical_memory(base, MP_AUDIO_SIZE, iomemtype);

    qemu_register_reset(musicpal_audio_reset, s);

    return i2c;

}

#else  /* !HAS_AUDIO */

static i2c_interface *musicpal_audio_init(uint32_t base, qemu_irq irq)

{

    return NULL;

}

#endif /* !HAS_AUDIO */

/* Ethernet register offsets */

#define MP_ETH_SMIR             0x010

#define MP_ETH_PCXR             0x408

#define MP_ETH_SDCMR            0x448

#define MP_ETH_ICR              0x450

#define MP_ETH_IMR              0x458

#define MP_ETH_FRDP0            0x480

#define MP_ETH_FRDP1            0x484

#define MP_ETH_FRDP2            0x488

#define MP_ETH_FRDP3            0x48C

#define MP_ETH_CRDP0            0x4A0

#define MP_ETH_CRDP1            0x4A4

#define MP_ETH_CRDP2            0x4A8

#define MP_ETH_CRDP3            0x4AC

#define MP_ETH_CTDP0            0x4E0

#define MP_ETH_CTDP1            0x4E4

#define MP_ETH_CTDP2            0x4E8

#define MP_ETH_CTDP3            0x4EC

/* MII PHY access */

#define MP_ETH_SMIR_DATA        0x0000FFFF

#define MP_ETH_SMIR_ADDR        0x03FF0000

#define MP_ETH_SMIR_OPCODE      (1 << 26) /* Read value */

#define MP_ETH_SMIR_RDVALID     (1 << 27)

/* PHY registers */

#define MP_ETH_PHY1_BMSR        0x00210000

#define MP_ETH_PHY1_PHYSID1     0x00410000

#define MP_ETH_PHY1_PHYSID2     0x00610000

#define MP_PHY_BMSR_LINK        0x0004

#define MP_PHY_BMSR_AUTONEG     0x0008

#define MP_PHY_88E3015          0x01410E20

/* TX descriptor status */

#define MP_ETH_TX_OWN           (1 << 31)

/* RX descriptor status */

#define MP_ETH_RX_OWN           (1 << 31)

/* Interrupt cause/mask bits */

#define MP_ETH_IRQ_RX_BIT       0

#define MP_ETH_IRQ_RX           (1 << MP_ETH_IRQ_RX_BIT)

#define MP_ETH_IRQ_TXHI_BIT     2

#define MP_ETH_IRQ_TXLO_BIT     3

/* Port config bits */

#define MP_ETH_PCXR_2BSM_BIT    28 /* 2-byte incoming suffix */

/* SDMA command bits */

#define MP_ETH_CMD_TXHI         (1 << 23)

#define MP_ETH_CMD_TXLO         (1 << 22)

typedef struct mv88w8618_tx_desc {

    uint32_t cmdstat;

    uint16_t res;

    uint16_t bytes;

    uint32_t buffer;

    uint32_t next;

} mv88w8618_tx_desc;

typedef struct mv88w8618_rx_desc {

    uint32_t cmdstat;

    uint16_t bytes;

    uint16_t buffer_size;

    uint32_t buffer;

    uint32_t next;

} mv88w8618_rx_desc;

typedef struct mv88w8618_eth_state {

    qemu_irq irq;

    uint32_t smir;

    uint32_t icr;

    uint32_t imr;

    int vlan_header;

    mv88w8618_tx_desc *tx_queue[2];

    mv88w8618_rx_desc *rx_queue[4];

    mv88w8618_rx_desc *frx_queue[4];

    mv88w8618_rx_desc *cur_rx[4];

    VLANClientState *vc;

} mv88w8618_eth_state;

static int eth_can_receive(void *opaque)

{

    return 1;

}

static void eth_receive(void *opaque, const uint8_t *buf, int size)

{

    mv88w8618_eth_state *s = opaque;

    mv88w8618_rx_desc *desc;

    int i;

    for (i = 0; i < 4; i++) {

        desc = s->cur_rx[i];

        if (!desc)

            continue;

        do {

            if (le32_to_cpu(desc->cmdstat) & MP_ETH_RX_OWN &&

                le16_to_cpu(desc->buffer_size) >= size) {

                memcpy(target2host_addr(le32_to_cpu(desc->buffer) +

                                        s->vlan_header),

                       buf, size);

                desc->bytes = cpu_to_le16(size + s->vlan_header);

                desc->cmdstat &= cpu_to_le32(~MP_ETH_RX_OWN);

                s->cur_rx[i] = target2host_addr(le32_to_cpu(desc->next));

                s->icr |= MP_ETH_IRQ_RX;

                if (s->icr & s->imr)

                    qemu_irq_raise(s->irq);

                return;

            }

            desc = target2host_addr(le32_to_cpu(desc->next));

        } while (desc != s->rx_queue[i]);

    }

}

static void eth_send(mv88w8618_eth_state *s, int queue_index)

{

    mv88w8618_tx_desc *desc = s->tx_queue[queue_index];

    do {

        if (le32_to_cpu(desc->cmdstat) & MP_ETH_TX_OWN) {

            qemu_send_packet(s->vc,

                             target2host_addr(le32_to_cpu(desc->buffer)),

                             le16_to_cpu(desc->bytes));

            desc->cmdstat &= cpu_to_le32(~MP_ETH_TX_OWN);

            s->icr |= 1 << (MP_ETH_IRQ_TXLO_BIT - queue_index);

        }

        desc = target2host_addr(le32_to_cpu(desc->next));

    } while (desc != s->tx_queue[queue_index]);

}

static uint32_t mv88w8618_eth_read(void *opaque, target_phys_addr_t offset)

{

    mv88w8618_eth_state *s = opaque;

    switch (offset) {

    case MP_ETH_SMIR:

        if (s->smir & MP_ETH_SMIR_OPCODE) {

            switch (s->smir & MP_ETH_SMIR_ADDR) {

            case MP_ETH_PHY1_BMSR:

                return MP_PHY_BMSR_LINK | MP_PHY_BMSR_AUTONEG |

                       MP_ETH_SMIR_RDVALID;

            case MP_ETH_PHY1_PHYSID1:

                return (MP_PHY_88E3015 >> 16) | MP_ETH_SMIR_RDVALID;

            case MP_ETH_PHY1_PHYSID2:

                return (MP_PHY_88E3015 & 0xFFFF) | MP_ETH_SMIR_RDVALID;

            default:

                return MP_ETH_SMIR_RDVALID;

            }

        }

        return 0;

    case MP_ETH_ICR:

        return s->icr;

    case MP_ETH_IMR:

        return s->imr;

    case MP_ETH_FRDP0 ... MP_ETH_FRDP3:

        return host2target_addr(s->frx_queue[(offset - MP_ETH_FRDP0)/4]);

    case MP_ETH_CRDP0 ... MP_ETH_CRDP3:

        return host2target_addr(s->rx_queue[(offset - MP_ETH_CRDP0)/4]);

    case MP_ETH_CTDP0 ... MP_ETH_CTDP3:

        return host2target_addr(s->tx_queue[(offset - MP_ETH_CTDP0)/4]);

    default:

        return 0;

    }

}

static void mv88w8618_eth_write(void *opaque, target_phys_addr_t offset,

                                uint32_t value)

{

    mv88w8618_eth_state *s = opaque;

    switch (offset) {

    case MP_ETH_SMIR:

        s->smir = value;

        break;

    case MP_ETH_PCXR:

        s->vlan_header = ((value >> MP_ETH_PCXR_2BSM_BIT) & 1) * 2;

        break;

    case MP_ETH_SDCMR:

        if (value & MP_ETH_CMD_TXHI)

            eth_send(s, 1);

        if (value & MP_ETH_CMD_TXLO)

            eth_send(s, 0);

        if (value & (MP_ETH_CMD_TXHI | MP_ETH_CMD_TXLO) && s->icr & s->imr)

            qemu_irq_raise(s->irq);

        break;

    case MP_ETH_ICR:

        s->icr &= value;

        break;

    case MP_ETH_IMR:

        s->imr = value;

        if (s->icr & s->imr)

            qemu_irq_raise(s->irq);

        break;

    case MP_ETH_FRDP0 ... MP_ETH_FRDP3:

        s->frx_queue[(offset - MP_ETH_FRDP0)/4] = target2host_addr(value);

        break;

    case MP_ETH_CRDP0 ... MP_ETH_CRDP3:

        s->rx_queue[(offset - MP_ETH_CRDP0)/4] =

            s->cur_rx[(offset - MP_ETH_CRDP0)/4] = target2host_addr(value);

        break;

    case MP_ETH_CTDP0 ... MP_ETH_CTDP3:

        s->tx_queue[(offset - MP_ETH_CTDP0)/4] = target2host_addr(value);

        break;

    }

}

static CPUReadMemoryFunc *mv88w8618_eth_readfn[] = {

    mv88w8618_eth_read,

    mv88w8618_eth_read,

    mv88w8618_eth_read

};

static CPUWriteMemoryFunc *mv88w8618_eth_writefn[] = {

    mv88w8618_eth_write,

    mv88w8618_eth_write,

    mv88w8618_eth_write

};

static void mv88w8618_eth_init(NICInfo *nd, uint32_t base, qemu_irq irq)

{

    mv88w8618_eth_state *s;

    int iomemtype;

    s = qemu_mallocz(sizeof(mv88w8618_eth_state));

    if (!s)

        return;

    s->irq = irq;

    s->vc = qemu_new_vlan_client(nd->vlan, eth_receive, eth_can_receive, s);

    iomemtype = cpu_register_io_memory(0, mv88w8618_eth_readfn,

                                       mv88w8618_eth_writefn, s);

    cpu_register_physical_memory(base, MP_ETH_SIZE, iomemtype);

}

/* LCD register offsets */

#define MP_LCD_IRQCTRL          0x180

#define MP_LCD_IRQSTAT          0x184

#define MP_LCD_SPICTRL          0x1ac

#define MP_LCD_INST             0x1bc

#define MP_LCD_DATA             0x1c0

/* Mode magics */

#define MP_LCD_SPI_DATA         0x00100011

#define MP_LCD_SPI_CMD          0x00104011

#define MP_LCD_SPI_INVALID      0x00000000

/* Commmands */

#define MP_LCD_INST_SETPAGE0    0xB0

/* ... */

#define MP_LCD_INST_SETPAGE7    0xB7

#define MP_LCD_TEXTCOLOR        0xe0e0ff /* RRGGBB */

typedef struct musicpal_lcd_state {

    uint32_t mode;

    uint32_t irqctrl;

    int page;

    int page_off;

    DisplayState *ds;

    QEMUConsole *console;

    uint8_t video_ram[128*64/8];

} musicpal_lcd_state;

static uint32_t lcd_brightness;

static uint8_t scale_lcd_color(uint8_t col)

{

    int tmp = col;

    switch (lcd_brightness) {

    case 0x00000007: /* 0 */

        return 0;

    case 0x00020000: /* 1 */

        return (tmp * 1) / 7;

    case 0x00020001: /* 2 */

        return (tmp * 2) / 7;

    case 0x00040000: /* 3 */

        return (tmp * 3) / 7;

    case 0x00010006: /* 4 */

        return (tmp * 4) / 7;

    case 0x00020005: /* 5 */

        return (tmp * 5) / 7;

    case 0x00040003: /* 6 */

        return (tmp * 6) / 7;

    case 0x00030004: /* 7 */

    default:

        return col;

    }

}

#define SET_LCD_PIXEL(depth, type) \

static inline void glue(set_lcd_pixel, depth) \

        (musicpal_lcd_state *s, int x, int y, type col) \

{ \

    int dx, dy; \

    type *pixel = &((type *) ds_get_data(s->ds))[(y * 128 * 3 + x) * 3]; \

\

    for (dy = 0; dy < 3; dy++, pixel += 127 * 3) \

        for (dx = 0; dx < 3; dx++, pixel++) \

            *pixel = col; \

}

SET_LCD_PIXEL(8, uint8_t)

SET_LCD_PIXEL(16, uint16_t)

SET_LCD_PIXEL(32, uint32_t)

#include "pixel_ops.h"

static void lcd_refresh(void *opaque)

{

    musicpal_lcd_state *s = opaque;

    int x, y, col;

    switch (ds_get_bits_per_pixel(s->ds)) {

    case 0:

        return;

#define LCD_REFRESH(depth, func) \

    case depth: \

        col = func(scale_lcd_color((MP_LCD_TEXTCOLOR >> 16) & 0xff), \

                   scale_lcd_color((MP_LCD_TEXTCOLOR >> 8) & 0xff), \

                   scale_lcd_color(MP_LCD_TEXTCOLOR & 0xff)); \

        for (x = 0; x < 128; x++) \

            for (y = 0; y < 64; y++) \

                if (s->video_ram[x + (y/8)*128] & (1 << (y % 8))) \

                    glue(set_lcd_pixel, depth)(s, x, y, col); \

                else \

                    glue(set_lcd_pixel, depth)(s, x, y, 0); \

        break;

    LCD_REFRESH(8, rgb_to_pixel8)

    LCD_REFRESH(16, rgb_to_pixel16)

    LCD_REFRESH(32, (s->ds->bgr ? rgb_to_pixel32bgr : rgb_to_pixel32))

    default:

        cpu_abort(cpu_single_env, "unsupported colour depth %i\n",

                  ds_get_bits_per_pixel(s->ds));

    }

    dpy_update(s->ds, 0, 0, 128*3, 64*3);

}

static void lcd_invalidate(void *opaque)

{

}

static uint32_t musicpal_lcd_read(void *opaque, target_phys_addr_t offset)

{

    musicpal_lcd_state *s = opaque;

    switch (offset) {

    case MP_LCD_IRQCTRL:

        return s->irqctrl;

    default:

        return 0;

    }

}

static void musicpal_lcd_write(void *opaque, target_phys_addr_t offset,

                               uint32_t value)

{

    musicpal_lcd_state *s = opaque;

    switch (offset) {

    case MP_LCD_IRQCTRL:

        s->irqctrl = value;

        break;

    case MP_LCD_SPICTRL:

        if (value == MP_LCD_SPI_DATA || value == MP_LCD_SPI_CMD)

            s->mode = value;

        else

            s->mode = MP_LCD_SPI_INVALID;

        break;

    case MP_LCD_INST:

        if (value >= MP_LCD_INST_SETPAGE0 && value <= MP_LCD_INST_SETPAGE7) {

            s->page = value - MP_LCD_INST_SETPAGE0;

            s->page_off = 0;

        }

        break;

    case MP_LCD_DATA:

        if (s->mode == MP_LCD_SPI_CMD) {

            if (value >= MP_LCD_INST_SETPAGE0 &&

                value <= MP_LCD_INST_SETPAGE7) {

                s->page = value - MP_LCD_INST_SETPAGE0;

                s->page_off = 0;

            }

        } else if (s->mode == MP_LCD_SPI_DATA) {

            s->video_ram[s->page*128 + s->page_off] = value;

            s->page_off = (s->page_off + 1) & 127;