[Qemu-devel] [PATCH 3/3] Make musicpal.c use the generic bitbang I2C device

[Benoit Canet]

Signed-off-by: Benoit Canet <address@hidden>
---
 hw/musicpal.c |  226 +++++++++++++++++----------------------------------------
 1 files changed, 67 insertions(+), 159 deletions(-)

diff --git a/hw/musicpal.c b/hw/musicpal.c
index 067c228..e36b0dc 100644
--- a/hw/musicpal.c
+++ b/hw/musicpal.c
@@ -70,132 +70,6 @@
 
 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
@@ -219,9 +93,9 @@ static i2c_interface *mixer_i2c;
 /* Wolfson 8750 I2C address */
 #define MP_WM_ADDR              0x34
 
-static const char audio_name[] = "mv88w8618";
-
+#ifdef HAS_AUDIO
 typedef struct musicpal_audio_state {
+    SysBusDevice busdev;
     qemu_irq irq;
     uint32_t playback_mode;
     uint32_t status;
@@ -235,7 +109,7 @@ typedef struct musicpal_audio_state {
     DeviceState *wm;
 } musicpal_audio_state;
 
-static void audio_callback(void *opaque, int free_out, int free_in)
+static void musicpal_audio_callback(void *opaque, int free_out, int free_in)
 {
     musicpal_audio_state *s = opaque;
     int16_t *codec_buffer;
@@ -418,36 +292,36 @@ static CPUWriteMemoryFunc *musicpal_audio_writefn[] = {
     musicpal_audio_write
 };
 
-static i2c_interface *musicpal_audio_init(qemu_irq irq)
+static void musicpal_audio_init(SysBusDevice *dev)
 {
-    musicpal_audio_state *s;
-    i2c_interface *i2c;
+    musicpal_audio_state *s = FROM_SYSBUS(musicpal_audio_state, dev);
     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;
+    sysbus_init_irq(dev, &s->irq);
 
-    s->wm = i2c_create_slave(i2c->bus, "wm8750", MP_WM_ADDR);
-    wm8750_data_req_set(s->wm, audio_callback, s);
+    wm8750_data_req_set(s->wm, musicpal_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);
+                                       musicpal_audio_writefn, s);
+    sysbus_init_mmio(dev, 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 */
+
+static SysBusDeviceInfo musicpal_audio_info = {
+    .init = musicpal_audio_init,
+    .qdev.name  = "musicpal_audio",
+    .qdev.size  = sizeof(musicpal_audio_state),
+    .qdev.props = (Property[]) {
+        {
+            .name   = "wm8750",
+            .info   = &qdev_prop_ptr,
+            .offset = offsetof(musicpal_audio_state, wm),
+        },
+        {/* end of list */}
+    }
+};
+#endif
 
 /* Ethernet register offsets */
 #define MP_ETH_SMIR             0x010
@@ -1327,10 +1201,11 @@ 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 +1275,10 @@ 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 +1315,7 @@ 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 +1347,8 @@ 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 +1369,7 @@ 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 +1388,10 @@ 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 +1528,14 @@ 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 +1604,40 @@ 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, "musicpal_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;
@@ -1771,6 +1676,9 @@ static void musicpal_register_devices(void)
                         musicpal_gpio_init);
     sysbus_register_dev("musicpal_key", sizeof(musicpal_key_state),
                         musicpal_key_init);
+#ifdef HAS_AUDIO
+    sysbus_register_withprop(&musicpal_audio_info);
+#endif
 }
 
 device_init(musicpal_register_devices)
-- 
1.6.0.4