Patchwork [4/9] Make musicpal.c use the I2C device and the Marvell 88w8618 audio device

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Submitter Benoit Canet
Date Aug. 14, 2009, 8:23 p.m.
Message ID <1250281397-7660-5-git-send-email-benoit.canet@gmail.com>
Download mbox | patch
Permalink /patch/31436/
State Superseded
Headers show

Comments

Benoit Canet - Aug. 14, 2009, 8:23 p.m.
Signed-off-by: Benoit Canet <benoit.canet@gmail.com>
---
 hw/musicpal.c |  427 ++++++---------------------------------------------------
 1 files changed, 40 insertions(+), 387 deletions(-)

Patch

diff --git a/hw/musicpal.c b/hw/musicpal.c
index 067c228..0b00ffc 100644
--- a/hw/musicpal.c
+++ b/hw/musicpal.c
@@ -17,7 +17,6 @@ 
 #include "block.h"
 #include "flash.h"
 #include "console.h"
-#include "audio/audio.h"
 #include "i2c.h"
 
 #define MP_MISC_BASE            0x80002000
@@ -39,7 +38,6 @@ 
 #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
@@ -70,385 +68,9 @@ 
 
 static ram_addr_t sram_off;
 
-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;
-    uint32_t target_buffer;
-    unsigned int threshold;
-    unsigned int play_pos;
-    unsigned int last_free;
-    uint32_t clock_div;
-    DeviceState *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 buf[4096];
-    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;
-
-    if (block_size > 4096)
-        return;
-
-    cpu_physical_memory_read(s->target_buffer + s->play_pos, (void *)buf,
-                             block_size);
-    mem_buffer = buf;
-    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 = 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 = 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(qemu_irq irq)
-{
-    musicpal_audio_state *s;
-    i2c_interface *i2c;
-    int iomemtype;
-
-    s = qemu_mallocz(sizeof(musicpal_audio_state));
-    s->irq = irq;
-
-    i2c = qemu_mallocz(sizeof(i2c_interface));
-    i2c->bus = i2c_init_bus(NULL, "i2c");
-    i2c->current_addr = -1;
-
-    s->wm = i2c_create_slave(i2c->bus, "wm8750", MP_WM_ADDR);
-    wm8750_data_req_set(s->wm, audio_callback, s);
-
-    iomemtype = cpu_register_io_memory(musicpal_audio_readfn,
-                       musicpal_audio_writefn, s);
-    cpu_register_physical_memory(MP_AUDIO_BASE, MP_AUDIO_SIZE, iomemtype);
-
-    qemu_register_reset(musicpal_audio_reset, s);
-
-    return i2c;
-}
-#else  /* !HAS_AUDIO */
-static i2c_interface *musicpal_audio_init(qemu_irq irq)
-{
-    return NULL;
-}
-#endif /* !HAS_AUDIO */
-
 /* Ethernet register offsets */
 #define MP_ETH_SMIR             0x010
 #define MP_ETH_PCXR             0x408
@@ -1327,10 +949,11 @@  typedef struct musicpal_gpio_state {
     uint32_t out_state;
     uint32_t in_state;
     uint32_t isr;
+    uint32_t i2c_read_data;
     uint32_t key_released;
     uint32_t keys_event;    /* store the received key event */
     qemu_irq irq;
-    qemu_irq out[3];
+    qemu_irq out[5];
 } musicpal_gpio_state;
 
 static void musicpal_gpio_brightness_update(musicpal_gpio_state *s) {
@@ -1400,6 +1023,10 @@  static void musicpal_gpio_irq(void *opaque, int irq, int level)
 {
     musicpal_gpio_state *s = (musicpal_gpio_state *) opaque;
 
+    if (irq == 10) {
+        s->i2c_read_data = level;
+    }
+
     /* receives keys bits */
     if (irq <= 7) {
         s->keys_event &= ~(1 << irq);
@@ -1436,7 +1063,7 @@  static uint32_t musicpal_gpio_read(void *opaque, target_phys_addr_t offset)
     case MP_GPIO_IN_HI:
         /* Update received I2C data */
         s->in_state = (s->in_state & ~MP_GPIO_I2C_DATA) |
-                        (i2c_get_data(mixer_i2c) << MP_GPIO_I2C_DATA_BIT);
+                        (s->i2c_read_data << MP_GPIO_I2C_DATA_BIT);
         return s->in_state >> 16;
 
     case MP_GPIO_ISR_LO:
@@ -1468,9 +1095,8 @@  static void musicpal_gpio_write(void *opaque, target_phys_addr_t offset,
         s->lcd_brightness = (s->lcd_brightness & 0xFFFF) |
                             (s->out_state & MP_GPIO_LCD_BRIGHTNESS);
         musicpal_gpio_brightness_update(s);
-        i2c_state_update(mixer_i2c,
-                         (s->out_state >> MP_GPIO_I2C_DATA_BIT) & 1,
-                         (s->out_state >> MP_GPIO_I2C_CLOCK_BIT) & 1);
+        qemu_set_irq(s->out[3], (s->out_state >> MP_GPIO_I2C_DATA_BIT) & 1);
+        qemu_set_irq(s->out[4], (s->out_state >> MP_GPIO_I2C_CLOCK_BIT) & 1);
         break;
 
     }
@@ -1491,6 +1117,7 @@  static CPUWriteMemoryFunc *musicpal_gpio_writefn[] = {
 static void musicpal_gpio_reset(musicpal_gpio_state *s)
 {
     s->in_state = 0xffffffff;
+    s->i2c_read_data = 1;
     s->key_released = 0;
     s->keys_event = 0;
     s->isr = 0;
@@ -1509,8 +1136,10 @@  static void musicpal_gpio_init(SysBusDevice *dev)
 
     musicpal_gpio_reset(s);
 
-    qdev_init_gpio_out(&dev->qdev, s->out, 3);
-    qdev_init_gpio_in(&dev->qdev, musicpal_gpio_irq, 10);
+    /* 3 brightness out + 2 lcd (data and clock ) */
+    qdev_init_gpio_out(&dev->qdev, s->out, 5);
+    /* 10 gpio button input + 1 I2C data input */
+    qdev_init_gpio_in(&dev->qdev, musicpal_gpio_irq, 11);
 }
 
 /* Keyboard codes & masks */
@@ -1647,8 +1276,14 @@  static void musicpal_init(ram_addr_t ram_size,
     qemu_irq *cpu_pic;
     qemu_irq pic[32];
     DeviceState *dev;
+    DeviceState *i2c_dev;
     DeviceState *lcd_dev;
     DeviceState *key_dev;
+#ifdef HAS_AUDIO
+    DeviceState *wm8750_dev;
+    SysBusDevice *s;
+#endif
+    i2c_bus *i2c;
     int i;
     int index;
     unsigned long flash_size;
@@ -1717,22 +1352,40 @@  static void musicpal_init(ram_addr_t ram_size,
     sysbus_mmio_map(sysbus_from_qdev(dev), 0, MP_ETH_BASE);
     sysbus_connect_irq(sysbus_from_qdev(dev), 0, pic[MP_ETH_IRQ]);
 
-    mixer_i2c = musicpal_audio_init(pic[MP_AUDIO_IRQ]);
-
     sysbus_create_simple("mv88w8618_wlan", MP_WLAN_BASE, NULL);
 
     musicpal_misc_init();
 
     dev = sysbus_create_simple("musicpal_gpio", MP_GPIO_BASE, pic[MP_GPIO_IRQ]);
+    i2c_dev = sysbus_create_simple("bitbang_i2c", 0, NULL);
+    i2c = (i2c_bus *)qdev_get_child_bus(i2c_dev, "i2c");
+
     lcd_dev = sysbus_create_simple("musicpal_lcd", MP_LCD_BASE, NULL);
     key_dev = sysbus_create_simple("musicpal_key", 0, NULL);
 
+    /* I2C read data */
+    qdev_connect_gpio_out(i2c_dev, 0, qdev_get_gpio_in(dev, 10));
+    /* I2C data */
+    qdev_connect_gpio_out(dev, 3, qdev_get_gpio_in(i2c_dev, 0));
+    /* I2C clock */
+    qdev_connect_gpio_out(dev, 4, qdev_get_gpio_in(i2c_dev, 1));
+
     for (i = 0; i < 3; i++)
         qdev_connect_gpio_out(dev, i, qdev_get_gpio_in(lcd_dev, i));
 
     for (i = 0; i < 10; i++)
         qdev_connect_gpio_out(key_dev, i, qdev_get_gpio_in(dev, i));
 
+#ifdef HAS_AUDIO
+    wm8750_dev = i2c_create_slave(i2c, "wm8750", MP_WM_ADDR);
+    dev = qdev_create(NULL, "mv88w8618_audio");
+    s = sysbus_from_qdev(dev);
+    qdev_prop_set_ptr(dev, "wm8750", wm8750_dev);
+    qdev_init(dev);
+    sysbus_mmio_map(s, 0, MP_AUDIO_BASE);
+    sysbus_connect_irq(s, 0, pic[MP_AUDIO_IRQ]);
+#endif
+
     musicpal_binfo.ram_size = MP_RAM_DEFAULT_SIZE;
     musicpal_binfo.kernel_filename = kernel_filename;
     musicpal_binfo.kernel_cmdline = kernel_cmdline;