[POWERPC] PS3: Vuart rework

PS3 vuart updates to reflect the new PS3 unified device support.
 - Move vuart devices to the PS3 system bus.
 - Replace use of ps3_vuart_port_device with ps3_system_bus_device.
 - Make the PS3 vuart bus driver a loadable module.
 - Add remove() and shutdown() routines.
 - Move ps3_vuart_work into ps3_vuart_port_priv.tx_list.
 - Remove redundant spinlock ps3_vuart_work.lock.
 - No longer free ps3_vuart_port_device.priv on shutdown.
 - Cleanup Kconfig defs.
 - Export symbols needed for modular port drivers.
 - Arrange to use port numbers found in repository.
 - Fix bugs in ps3_vuart_read_async() and polled reading
 - Cleanup handling of shared interrupt with ps3_vuart_bus_interrupt_get()
   and ps3_vuart_bus_interrupt_put()
 - Add more comments to vuart.c.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 510 insertions, 374 deletions

diff --git a/drivers/ps3/vuart.c b/drivers/ps3/vuart.c
index 5333fb2f0d86..bea25a1391ee 100644
--- a/drivers/ps3/vuart.c
+++ b/drivers/ps3/vuart.c
@@ -71,6 +71,34 @@ enum vuart_interrupt_mask {
 };
 
 /**
+ * struct ps3_vuart_port_priv - private vuart device data.
+ */
+
+struct ps3_vuart_port_priv {
+        u64 interrupt_mask;
+
+        struct {
+                spinlock_t lock;
+                struct list_head head;
+        } tx_list;
+        struct {
+                struct ps3_vuart_work work;
+                unsigned long bytes_held;
+                spinlock_t lock;
+                struct list_head head;
+        } rx_list;
+        struct ps3_vuart_stats stats;
+};
+
+static struct ps3_vuart_port_priv *to_port_priv(
+        struct ps3_system_bus_device *dev)
+{
+        BUG_ON(!dev);
+        BUG_ON(!dev->driver_priv);
+        return (struct ps3_vuart_port_priv *)dev->driver_priv;
+}
+
+/**
  * struct ports_bmp - bitmap indicating ports needing service.
  *
  * A 256 bit read only bitmap indicating ports needing service.  Do not write
@@ -89,23 +117,6 @@ static void __maybe_unused _dump_ports_bmp(
         pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
 }
 
-static int ps3_vuart_match_id_to_port(enum ps3_match_id match_id,
-        unsigned int *port_number)
-{
-        switch(match_id) {
-        case PS3_MATCH_ID_AV_SETTINGS:
-                *port_number = 0;
-                return 0;
-        case PS3_MATCH_ID_SYSTEM_MANAGER:
-                *port_number = 2;
-                return 0;
-        default:
-                WARN_ON(1);
-                *port_number = UINT_MAX;
-                return -EINVAL;
-        };
-}
-
 #define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
 static void __maybe_unused _dump_port_params(unsigned int port_number,
         const char* func, int line)
@@ -144,14 +155,14 @@ struct vuart_triggers {
         unsigned long tx;
 };
 
-int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
+int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
         struct vuart_triggers *trig)
 {
         int result;
         unsigned long size;
         unsigned long val;
 
-        result = lv1_get_virtual_uart_param(dev->priv->port_number,
+        result = lv1_get_virtual_uart_param(dev->port_number,
                 PARAM_TX_TRIGGER, &trig->tx);
 
         if (result) {
@@ -160,7 +171,7 @@ int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
                 return result;
         }
 
-        result = lv1_get_virtual_uart_param(dev->priv->port_number,
+        result = lv1_get_virtual_uart_param(dev->port_number,
                 PARAM_RX_BUF_SIZE, &size);
 
         if (result) {
@@ -169,7 +180,7 @@ int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
                 return result;
         }
 
-        result = lv1_get_virtual_uart_param(dev->priv->port_number,
+        result = lv1_get_virtual_uart_param(dev->port_number,
                 PARAM_RX_TRIGGER, &val);
 
         if (result) {
@@ -186,13 +197,13 @@ int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
         return result;
 }
 
-int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
+int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
         unsigned int rx)
 {
         int result;
         unsigned long size;
 
-        result = lv1_set_virtual_uart_param(dev->priv->port_number,
+        result = lv1_set_virtual_uart_param(dev->port_number,
                 PARAM_TX_TRIGGER, tx);
 
         if (result) {
@@ -201,7 +212,7 @@ int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
                 return result;
         }
 
-        result = lv1_get_virtual_uart_param(dev->priv->port_number,
+        result = lv1_get_virtual_uart_param(dev->port_number,
                 PARAM_RX_BUF_SIZE, &size);
 
         if (result) {
@@ -210,7 +221,7 @@ int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
                 return result;
         }
 
-        result = lv1_set_virtual_uart_param(dev->priv->port_number,
+        result = lv1_set_virtual_uart_param(dev->port_number,
                 PARAM_RX_TRIGGER, size - rx);
 
         if (result) {
@@ -225,10 +236,12 @@ int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
         return result;
 }
 
-static int ps3_vuart_get_rx_bytes_waiting(struct ps3_vuart_port_device *dev,
+static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
         u64 *bytes_waiting)
 {
-        int result = lv1_get_virtual_uart_param(dev->priv->port_number,
+        int result;
+
+        result = lv1_get_virtual_uart_param(dev->port_number,
                 PARAM_RX_BYTES, bytes_waiting);
 
         if (result)
@@ -240,17 +253,24 @@ static int ps3_vuart_get_rx_bytes_waiting(struct ps3_vuart_port_device *dev,
         return result;
 }
 
-static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev,
+/**
+ * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
+ * @dev: The struct ps3_system_bus_device instance.
+ * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
+ */
+
+static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
         unsigned long mask)
 {
         int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
 
         dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
 
-        dev->priv->interrupt_mask = mask;
+        priv->interrupt_mask = mask;
 
-        result = lv1_set_virtual_uart_param(dev->priv->port_number,
-                PARAM_INTERRUPT_MASK, dev->priv->interrupt_mask);
+        result = lv1_set_virtual_uart_param(dev->port_number,
+                PARAM_INTERRUPT_MASK, priv->interrupt_mask);
 
         if (result)
                 dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
@@ -259,79 +279,96 @@ static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev,
         return result;
 }
 
-static int ps3_vuart_get_interrupt_status(struct ps3_vuart_port_device *dev,
+static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
         unsigned long *status)
 {
+        int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         u64 tmp;
-        int result = lv1_get_virtual_uart_param(dev->priv->port_number,
+
+        result = lv1_get_virtual_uart_param(dev->port_number,
                 PARAM_INTERRUPT_STATUS, &tmp);
 
         if (result)
                 dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
                         __func__, __LINE__, ps3_result(result));
 
-        *status = tmp & dev->priv->interrupt_mask;
+        *status = tmp & priv->interrupt_mask;
 
         dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
-                __func__, __LINE__, dev->priv->interrupt_mask, tmp, *status);
+                __func__, __LINE__, priv->interrupt_mask, tmp, *status);
 
         return result;
 }
 
-int ps3_vuart_enable_interrupt_tx(struct ps3_vuart_port_device *dev)
+int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
 {
-        return (dev->priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
-                : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+
+        return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
+                : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
                 | INTERRUPT_MASK_TX);
 }
 
-int ps3_vuart_enable_interrupt_rx(struct ps3_vuart_port_device *dev)
+int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
 {
-        return (dev->priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
-                : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+
+        return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
+                : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
                 | INTERRUPT_MASK_RX);
 }
 
-int ps3_vuart_enable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
+int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
 {
-        return (dev->priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
-                : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+
+        return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
+                : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
                 | INTERRUPT_MASK_DISCONNECT);
 }
 
-int ps3_vuart_disable_interrupt_tx(struct ps3_vuart_port_device *dev)
+int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
 {
-        return (dev->priv->interrupt_mask & INTERRUPT_MASK_TX)
-                ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+
+        return (priv->interrupt_mask & INTERRUPT_MASK_TX)
+                ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
                 & ~INTERRUPT_MASK_TX) : 0;
 }
 
-int ps3_vuart_disable_interrupt_rx(struct ps3_vuart_port_device *dev)
+int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
 {
-        return (dev->priv->interrupt_mask & INTERRUPT_MASK_RX)
-                ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+
+        return (priv->interrupt_mask & INTERRUPT_MASK_RX)
+                ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
                 & ~INTERRUPT_MASK_RX) : 0;
 }
 
-int ps3_vuart_disable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
+int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
 {
-        return (dev->priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
-                ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+
+        return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
+                ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
                 & ~INTERRUPT_MASK_DISCONNECT) : 0;
 }
 
 /**
  * ps3_vuart_raw_write - Low level write helper.
+ * @dev: The struct ps3_system_bus_device instance.
  *
  * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
  */
 
-static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev,
+static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
         const void* buf, unsigned int bytes, unsigned long *bytes_written)
 {
         int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
 
-        result = lv1_write_virtual_uart(dev->priv->port_number,
+        result = lv1_write_virtual_uart(dev->port_number,
                 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
 
         if (result) {
@@ -340,28 +377,30 @@ static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev,
                 return result;
         }
 
-        dev->priv->stats.bytes_written += *bytes_written;
+        priv->stats.bytes_written += *bytes_written;
 
         dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
-                *bytes_written, bytes, dev->priv->stats.bytes_written);
+                *bytes_written, bytes, priv->stats.bytes_written);
 
         return result;
 }
 
 /**
  * ps3_vuart_raw_read - Low level read helper.
+ * @dev: The struct ps3_system_bus_device instance.
  *
  * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
  */
 
-static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf,
+static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
         unsigned int bytes, unsigned long *bytes_read)
 {
         int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
 
         dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
 
-        result = lv1_read_virtual_uart(dev->priv->port_number,
+        result = lv1_read_virtual_uart(dev->port_number,
                 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
 
         if (result) {
@@ -370,25 +409,27 @@ static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf,
                 return result;
         }
 
-        dev->priv->stats.bytes_read += *bytes_read;
+        priv->stats.bytes_read += *bytes_read;
 
         dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
-                *bytes_read, bytes, dev->priv->stats.bytes_read);
+                *bytes_read, bytes, priv->stats.bytes_read);
 
         return result;
 }
 
 /**
  * ps3_vuart_clear_rx_bytes - Discard bytes received.
+ * @dev: The struct ps3_system_bus_device instance.
  * @bytes: Max byte count to discard, zero = all pending.
  *
  * Used to clear pending rx interrupt source.  Will not block.
  */
 
-void ps3_vuart_clear_rx_bytes(struct ps3_vuart_port_device *dev,
+void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
         unsigned int bytes)
 {
         int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         u64 bytes_waiting;
         void* tmp;
 
@@ -418,8 +459,9 @@ void ps3_vuart_clear_rx_bytes(struct ps3_vuart_port_device *dev,
 
         /* Don't include these bytes in the stats. */
 
-        dev->priv->stats.bytes_read -= bytes_waiting;
+        priv->stats.bytes_read -= bytes_waiting;
 }
+EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
 
 /**
  * struct list_buffer - An element for a port device fifo buffer list.
@@ -435,6 +477,7 @@ struct list_buffer {
 
 /**
  * ps3_vuart_write - the entry point for writing data to a port
+ * @dev: The struct ps3_system_bus_device instance.
  *
  * If the port is idle on entry as much of the incoming data is written to
  * the port as the port will accept.  Otherwise a list buffer is created
@@ -442,25 +485,26 @@ struct list_buffer {
  * then enqueued for transmision via the transmit interrupt.
  */
 
-int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
+int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
         unsigned int bytes)
 {
         static unsigned long dbg_number;
         int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         unsigned long flags;
         struct list_buffer *lb;
 
         dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
                 bytes, bytes);
 
-        spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
+        spin_lock_irqsave(&priv->tx_list.lock, flags);
 
-        if (list_empty(&dev->priv->tx_list.head)) {
+        if (list_empty(&priv->tx_list.head)) {
                 unsigned long bytes_written;
 
                 result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
 
-                spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
+                spin_unlock_irqrestore(&priv->tx_list.lock, flags);
 
                 if (result) {
                         dev_dbg(&dev->core,
@@ -478,7 +522,7 @@ int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
                 bytes -= bytes_written;
                 buf += bytes_written;
         } else
-                spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
+                spin_unlock_irqrestore(&priv->tx_list.lock, flags);
 
         lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
 
@@ -491,29 +535,86 @@ int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
         lb->tail = lb->data + bytes;
         lb->dbg_number = ++dbg_number;
 
-        spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
-        list_add_tail(&lb->link, &dev->priv->tx_list.head);
+        spin_lock_irqsave(&priv->tx_list.lock, flags);
+        list_add_tail(&lb->link, &priv->tx_list.head);
         ps3_vuart_enable_interrupt_tx(dev);
-        spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
+        spin_unlock_irqrestore(&priv->tx_list.lock, flags);
 
         dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
                 __func__, __LINE__, lb->dbg_number, bytes);
 
         return 0;
 }
+EXPORT_SYMBOL_GPL(ps3_vuart_write);
+
+/**
+ * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list.
+ * @dev: The struct ps3_system_bus_device instance.
+ * @bytes_queued: Number of bytes queued to the buffer list.
+ *
+ * Must be called with priv->rx_list.lock held.
+ */
+
+static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev,
+        u64 *bytes_queued)
+{
+        static unsigned long dbg_number;
+        int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+        struct list_buffer *lb;
+        u64 bytes;
+
+        *bytes_queued = 0;
+
+        result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
+        BUG_ON(result);
+
+        if (result)
+                return -EIO;
+
+        if (!bytes)
+                return 0;
+
+        /* Add some extra space for recently arrived data. */
+
+        bytes += 128;
+
+        lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
+
+        if (!lb)
+                return -ENOMEM;
+
+        ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
+
+        lb->head = lb->data;
+        lb->tail = lb->data + bytes;
+        lb->dbg_number = ++dbg_number;
+
+        list_add_tail(&lb->link, &priv->rx_list.head);
+        priv->rx_list.bytes_held += bytes;
+
+        dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
+                __func__, __LINE__, lb->dbg_number, bytes);
+
+        *bytes_queued = bytes;
+
+        return 0;
+}
 
 /**
- * ps3_vuart_read - the entry point for reading data from a port
+ * ps3_vuart_read - The entry point for reading data from a port.
  *
- * If enough bytes to satisfy the request are held in the buffer list those
- * bytes are dequeued and copied to the caller's buffer.  Emptied list buffers
- * are retiered.  If the request cannot be statified by bytes held in the list
- * buffers -EAGAIN is returned.
+ * Queue data waiting at the port, and if enough bytes to satisfy the request
+ * are held in the buffer list those bytes are dequeued and copied to the
+ * caller's buffer.  Emptied list buffers are retiered.  If the request cannot
+ * be statified by bytes held in the list buffers -EAGAIN is returned.
  */
 
-int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
+int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
         unsigned int bytes)
 {
+        int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         unsigned long flags;
         struct list_buffer *lb, *n;
         unsigned long bytes_read;
@@ -521,30 +622,37 @@ int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
         dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
                 bytes, bytes);
 
-        spin_lock_irqsave(&dev->priv->rx_list.lock, flags);
+        spin_lock_irqsave(&priv->rx_list.lock, flags);
 
-        if (dev->priv->rx_list.bytes_held < bytes) {
-                spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
-                dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
-                        __func__, __LINE__,
-                        bytes - dev->priv->rx_list.bytes_held);
-                return -EAGAIN;
+        /* Queue rx bytes here for polled reads. */
+
+        while (priv->rx_list.bytes_held < bytes) {
+                u64 tmp;
+
+                result = ps3_vuart_queue_rx_bytes(dev, &tmp);
+                if (result || !tmp) {
+                        dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
+                                __func__, __LINE__,
+                                bytes - priv->rx_list.bytes_held);
+                        spin_unlock_irqrestore(&priv->rx_list.lock, flags);
+                        return -EAGAIN;
+                }
         }
 
-        list_for_each_entry_safe(lb, n, &dev->priv->rx_list.head, link) {
+        list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) {
                 bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
 
                 memcpy(buf, lb->head, bytes_read);
                 buf += bytes_read;
                 bytes -= bytes_read;
-                dev->priv->rx_list.bytes_held -= bytes_read;
+                priv->rx_list.bytes_held -= bytes_read;
 
                 if (bytes_read < lb->tail - lb->head) {
                         lb->head += bytes_read;
                         dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
                                 "bytes\n", __func__, __LINE__, lb->dbg_number,
                                 bytes_read);
-                        spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
+                        spin_unlock_irqrestore(&priv->rx_list.lock, flags);
                         return 0;
                 }
 
@@ -556,16 +664,32 @@ int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
                 kfree(lb);
         }
 
-        spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
+        spin_unlock_irqrestore(&priv->rx_list.lock, flags);
         return 0;
 }
+EXPORT_SYMBOL_GPL(ps3_vuart_read);
 
-int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
-        unsigned int bytes)
+/**
+ * ps3_vuart_work - Asynchronous read handler.
+ */
+
+static void ps3_vuart_work(struct work_struct *work)
+{
+        struct ps3_system_bus_device *dev =
+                ps3_vuart_work_to_system_bus_dev(work);
+        struct ps3_vuart_port_driver *drv =
+                ps3_system_bus_dev_to_vuart_drv(dev);
+
+        BUG_ON(!drv);
+        drv->work(dev);
+}
+
+int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes)
 {
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         unsigned long flags;
 
-        if(dev->priv->work.trigger) {
+        if (priv->rx_list.work.trigger) {
                 dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
                         __func__, __LINE__);
                 return -EAGAIN;
@@ -573,30 +697,32 @@ int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
 
         BUG_ON(!bytes);
 
-        PREPARE_WORK(&dev->priv->work.work, func);
+        PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work);
 
-        spin_lock_irqsave(&dev->priv->work.lock, flags);
-        if(dev->priv->rx_list.bytes_held >= bytes) {
+        spin_lock_irqsave(&priv->rx_list.lock, flags);
+        if (priv->rx_list.bytes_held >= bytes) {
                 dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
                         __func__, __LINE__, bytes);
-                schedule_work(&dev->priv->work.work);
-                spin_unlock_irqrestore(&dev->priv->work.lock, flags);
+                schedule_work(&priv->rx_list.work.work);
+                spin_unlock_irqrestore(&priv->rx_list.lock, flags);
                 return 0;
         }
 
-        dev->priv->work.trigger = bytes;
-        spin_unlock_irqrestore(&dev->priv->work.lock, flags);
+        priv->rx_list.work.trigger = bytes;
+        spin_unlock_irqrestore(&priv->rx_list.lock, flags);
 
         dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
                 __LINE__, bytes, bytes);
 
         return 0;
 }
+EXPORT_SYMBOL_GPL(ps3_vuart_read_async);
 
-void ps3_vuart_cancel_async(struct ps3_vuart_port_device *dev)
+void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev)
 {
-        dev->priv->work.trigger = 0;
+        to_port_priv(dev)->rx_list.work.trigger = 0;
 }
+EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async);
 
 /**
  * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
@@ -606,18 +732,19 @@ void ps3_vuart_cancel_async(struct ps3_vuart_port_device *dev)
  * adjusts the final list buffer state for a partial write.
  */
 
-static int ps3_vuart_handle_interrupt_tx(struct ps3_vuart_port_device *dev)
+static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev)
 {
         int result = 0;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         unsigned long flags;
         struct list_buffer *lb, *n;
         unsigned long bytes_total = 0;
 
         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 
-        spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
+        spin_lock_irqsave(&priv->tx_list.lock, flags);
 
-        list_for_each_entry_safe(lb, n, &dev->priv->tx_list.head, link) {
+        list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) {
 
                 unsigned long bytes_written;
 
@@ -651,7 +778,7 @@ static int ps3_vuart_handle_interrupt_tx(struct ps3_vuart_port_device *dev)
 
         ps3_vuart_disable_interrupt_tx(dev);
 port_full:
-        spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
+        spin_unlock_irqrestore(&priv->tx_list.lock, flags);
         dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
                 __func__, __LINE__, bytes_total);
         return result;
@@ -665,60 +792,37 @@ port_full:
  * buffer list.  Buffer list data is dequeued via ps3_vuart_read.
  */
 
-static int ps3_vuart_handle_interrupt_rx(struct ps3_vuart_port_device *dev)
+static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev)
 {
-        static unsigned long dbg_number;
-        int result = 0;
+        int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         unsigned long flags;
-        struct list_buffer *lb;
-        unsigned long bytes;
+        u64 bytes;
 
         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 
-        result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
-
-        if (result)
-                return -EIO;
-
-        BUG_ON(!bytes);
-
-        /* Add some extra space for recently arrived data. */
-
-        bytes += 128;
-
-        lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
+        spin_lock_irqsave(&priv->rx_list.lock, flags);
+        result = ps3_vuart_queue_rx_bytes(dev, &bytes);
 
-        if (!lb)
-                return -ENOMEM;
-
-        ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
-
-        lb->head = lb->data;
-        lb->tail = lb->data + bytes;
-        lb->dbg_number = ++dbg_number;
-
-        spin_lock_irqsave(&dev->priv->rx_list.lock, flags);
-        list_add_tail(&lb->link, &dev->priv->rx_list.head);
-        dev->priv->rx_list.bytes_held += bytes;
-        spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
-
-        dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
-                __func__, __LINE__, lb->dbg_number, bytes);
+        if (result) {
+                spin_unlock_irqrestore(&priv->rx_list.lock, flags);
+                return result;
+        }
 
-        spin_lock_irqsave(&dev->priv->work.lock, flags);
-        if(dev->priv->work.trigger
-                && dev->priv->rx_list.bytes_held >= dev->priv->work.trigger) {
+        if (priv->rx_list.work.trigger && priv->rx_list.bytes_held
+                >= priv->rx_list.work.trigger) {
                 dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
-                        __func__, __LINE__, dev->priv->work.trigger);
-                dev->priv->work.trigger = 0;
-                schedule_work(&dev->priv->work.work);
+                        __func__, __LINE__, priv->rx_list.work.trigger);
+                priv->rx_list.work.trigger = 0;
+                schedule_work(&priv->rx_list.work.work);
         }
-        spin_unlock_irqrestore(&dev->priv->work.lock, flags);
-        return 0;
+
+        spin_unlock_irqrestore(&priv->rx_list.lock, flags);
+        return result;
 }
 
 static int ps3_vuart_handle_interrupt_disconnect(
-        struct ps3_vuart_port_device *dev)
+        struct ps3_system_bus_device *dev)
 {
         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
         BUG_ON("no support");
@@ -733,9 +837,10 @@ static int ps3_vuart_handle_interrupt_disconnect(
  * stage handler after one iteration.
  */
 
-static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev)
+static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
 {
         int result;
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
         unsigned long status;
 
         result = ps3_vuart_get_interrupt_status(dev, &status);
@@ -747,21 +852,21 @@ static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev)
                 status);
 
         if (status & INTERRUPT_MASK_DISCONNECT) {
-                dev->priv->stats.disconnect_interrupts++;
+                priv->stats.disconnect_interrupts++;
                 result = ps3_vuart_handle_interrupt_disconnect(dev);
                 if (result)
                         ps3_vuart_disable_interrupt_disconnect(dev);
         }
 
         if (status & INTERRUPT_MASK_TX) {
-                dev->priv->stats.tx_interrupts++;
+                priv->stats.tx_interrupts++;
                 result = ps3_vuart_handle_interrupt_tx(dev);
                 if (result)
                         ps3_vuart_disable_interrupt_tx(dev);
         }
 
         if (status & INTERRUPT_MASK_RX) {
-                dev->priv->stats.rx_interrupts++;
+                priv->stats.rx_interrupts++;
                 result = ps3_vuart_handle_interrupt_rx(dev);
                 if (result)
                         ps3_vuart_disable_interrupt_rx(dev);
@@ -771,11 +876,11 @@ static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev)
 }
 
 struct vuart_bus_priv {
-        const struct ports_bmp bmp;
+        struct ports_bmp *bmp;
         unsigned int virq;
         struct semaphore probe_mutex;
         int use_count;
-        struct ps3_vuart_port_device *devices[PORT_COUNT];
+        struct ps3_system_bus_device *devices[PORT_COUNT];
 } static vuart_bus_priv;
 
 /**
@@ -788,17 +893,16 @@ struct vuart_bus_priv {
 
 static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
 {
-        struct vuart_bus_priv *bus_priv;
+        struct vuart_bus_priv *bus_priv = _private;
 
-        BUG_ON(!_private);
-        bus_priv = (struct vuart_bus_priv *)_private;
+        BUG_ON(!bus_priv);
 
         while (1) {
                 unsigned int port;
 
-                dump_ports_bmp(&bus_priv->bmp);
+                dump_ports_bmp(bus_priv->bmp);
 
-                port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp.status);
+                port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status);
 
                 if (port == BITS_PER_LONG)
                         break;
@@ -812,100 +916,144 @@ static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
         return IRQ_HANDLED;
 }
 
-static int ps3_vuart_match(struct device *_dev, struct device_driver *_drv)
+static int ps3_vuart_bus_interrupt_get(void)
 {
         int result;
-        struct ps3_vuart_port_driver *drv = to_ps3_vuart_port_driver(_drv);
-        struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 
-        result = dev->match_id == drv->match_id;
+        pr_debug(" -> %s:%d\n", __func__, __LINE__);
+
+        vuart_bus_priv.use_count++;
+
+        BUG_ON(vuart_bus_priv.use_count > 2);
+
+        if (vuart_bus_priv.use_count != 1) {
+                return 0;
+        }
+
+        BUG_ON(vuart_bus_priv.bmp);
+
+        vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL);
+
+        if (!vuart_bus_priv.bmp) {
+                pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__);
+                result = -ENOMEM;
+                goto fail_bmp_malloc;
+        }
+
+        result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp,
+                &vuart_bus_priv.virq);
+
+        if (result) {
+                pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n",
+                        __func__, __LINE__, result);
+                result = -EPERM;
+                goto fail_alloc_irq;
+        }
+
+        result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
+                IRQF_DISABLED, "vuart", &vuart_bus_priv);
 
-        dev_info(&dev->core, "%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__,
-                __LINE__, dev->match_id, dev->core.bus_id, drv->match_id,
-                drv->core.name, (result ? "match" : "miss"));
+        if (result) {
+                pr_debug("%s:%d: request_irq failed (%d)\n",
+                        __func__, __LINE__, result);
+                goto fail_request_irq;
+        }
 
+        pr_debug(" <- %s:%d: ok\n", __func__, __LINE__);
         return result;
+
+fail_request_irq:
+        ps3_vuart_irq_destroy(vuart_bus_priv.virq);
+        vuart_bus_priv.virq = NO_IRQ;
+fail_alloc_irq:
+        kfree(vuart_bus_priv.bmp);
+        vuart_bus_priv.bmp = NULL;
+fail_bmp_malloc:
+        vuart_bus_priv.use_count--;
+        pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
+        return result;
+}
+
+static int ps3_vuart_bus_interrupt_put(void)
+{
+        pr_debug(" -> %s:%d\n", __func__, __LINE__);
+
+        vuart_bus_priv.use_count--;
+
+        BUG_ON(vuart_bus_priv.use_count < 0);
+
+        if (vuart_bus_priv.use_count != 0)
+                return 0;
+
+        free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
+
+        ps3_vuart_irq_destroy(vuart_bus_priv.virq);
+        vuart_bus_priv.virq = NO_IRQ;
+
+        kfree(vuart_bus_priv.bmp);
+        vuart_bus_priv.bmp = NULL;
+
+        pr_debug(" <- %s:%d\n", __func__, __LINE__);
+        return 0;
 }
 
-static int ps3_vuart_probe(struct device *_dev)
+static int ps3_vuart_probe(struct ps3_system_bus_device *dev)
 {
         int result;
-        unsigned int port_number;
-        struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
-        struct ps3_vuart_port_driver *drv =
-                to_ps3_vuart_port_driver(_dev->driver);
+        struct ps3_vuart_port_driver *drv;
+        struct ps3_vuart_port_priv *priv = NULL;
 
         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 
+        drv = ps3_system_bus_dev_to_vuart_drv(dev);
+
+        dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__,
+                drv->core.core.name);
+
         BUG_ON(!drv);
 
-        down(&vuart_bus_priv.probe_mutex);
+        if (dev->port_number >= PORT_COUNT) {
+                BUG();
+                return -EINVAL;
+        }
 
-        /* Setup vuart_bus_priv.devices[]. */
+        down(&vuart_bus_priv.probe_mutex);
 
-        result = ps3_vuart_match_id_to_port(dev->match_id,
-                &port_number);
+        result = ps3_vuart_bus_interrupt_get();
 
-        if (result) {
-                dev_dbg(&dev->core, "%s:%d: unknown match_id (%d)\n",
-                        __func__, __LINE__, dev->match_id);
-                result = -EINVAL;
-                goto fail_match;
-        }
+        if (result)
+                goto fail_setup_interrupt;
 
-        if (vuart_bus_priv.devices[port_number]) {
+        if (vuart_bus_priv.devices[dev->port_number]) {
                 dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
-                        __LINE__, port_number);
+                        __LINE__, dev->port_number);
                 result = -EBUSY;
-                goto fail_match;
+                goto fail_busy;
         }
 
-        vuart_bus_priv.devices[port_number] = dev;
+        vuart_bus_priv.devices[dev->port_number] = dev;
 
-        /* Setup dev->priv. */
+        /* Setup dev->driver_priv. */
 
-        dev->priv = kzalloc(sizeof(struct ps3_vuart_port_priv), GFP_KERNEL);
+        dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv),
+                GFP_KERNEL);
 
-        if (!dev->priv) {
+        if (!dev->driver_priv) {
                 result = -ENOMEM;
-                goto fail_alloc;
+                goto fail_dev_malloc;
         }
 
-        dev->priv->port_number = port_number;
-
-        INIT_LIST_HEAD(&dev->priv->tx_list.head);
-        spin_lock_init(&dev->priv->tx_list.lock);
+        priv = to_port_priv(dev);
 
-        INIT_LIST_HEAD(&dev->priv->rx_list.head);
-        spin_lock_init(&dev->priv->rx_list.lock);
+        INIT_LIST_HEAD(&priv->tx_list.head);
+        spin_lock_init(&priv->tx_list.lock);
 
-        INIT_WORK(&dev->priv->work.work, NULL);
-        spin_lock_init(&dev->priv->work.lock);
-        dev->priv->work.trigger = 0;
-        dev->priv->work.dev = dev;
+        INIT_LIST_HEAD(&priv->rx_list.head);
+        spin_lock_init(&priv->rx_list.lock);
 
-        if (++vuart_bus_priv.use_count == 1) {
-
-                result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY,
-                        (void*)&vuart_bus_priv.bmp.status, &vuart_bus_priv.virq);
-
-                if (result) {
-                        dev_dbg(&dev->core,
-                                "%s:%d: ps3_vuart_irq_setup failed (%d)\n",
-                                __func__, __LINE__, result);
-                        result = -EPERM;
-                        goto fail_alloc_irq;
-                }
-
-                result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
-                        IRQF_DISABLED, "vuart", &vuart_bus_priv);
-
-                if (result) {
-                        dev_info(&dev->core, "%s:%d: request_irq failed (%d)\n",
-                                __func__, __LINE__, result);
-                        goto fail_request_irq;
-                }
-        }
+        INIT_WORK(&priv->rx_list.work.work, NULL);
+        priv->rx_list.work.trigger = 0;
+        priv->rx_list.work.dev = dev;
 
         /* clear stale pending interrupts */
 
@@ -936,150 +1084,158 @@ static int ps3_vuart_probe(struct device *_dev)
 
 fail_probe:
         ps3_vuart_set_interrupt_mask(dev, 0);
-fail_request_irq:
-        ps3_vuart_irq_destroy(vuart_bus_priv.virq);
-        vuart_bus_priv.virq = NO_IRQ;
-fail_alloc_irq:
-        --vuart_bus_priv.use_count;
-        kfree(dev->priv);
-        dev->priv = NULL;
-fail_alloc:
-        vuart_bus_priv.devices[port_number] = NULL;
-fail_match:
+        kfree(dev->driver_priv);
+        dev->driver_priv = NULL;
+fail_dev_malloc:
+        vuart_bus_priv.devices[dev->port_number] = NULL;
+fail_busy:
+        ps3_vuart_bus_interrupt_put();
+fail_setup_interrupt:
         up(&vuart_bus_priv.probe_mutex);
-        dev_dbg(&dev->core, "%s:%d failed\n", __func__, __LINE__);
+        dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__);
         return result;
 }
 
-static int ps3_vuart_remove(struct device *_dev)
+/**
+ * ps3_vuart_cleanup - common cleanup helper.
+ * @dev: The struct ps3_system_bus_device instance.
+ *
+ * Cleans interrupts and HV resources.  Must be called with
+ * vuart_bus_priv.probe_mutex held.  Used by ps3_vuart_remove and
+ * ps3_vuart_shutdown.  After this call, polled reading will still work.
+ */
+
+static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
 {
-        struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
-        struct ps3_vuart_port_driver *drv =
-                to_ps3_vuart_port_driver(_dev->driver);
+        dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
+
+        ps3_vuart_cancel_async(dev);
+        ps3_vuart_set_interrupt_mask(dev, 0);
+        ps3_vuart_bus_interrupt_put();
+        return 0;
+}
+
+/**
+ * ps3_vuart_remove - Completely clean the device instance.
+ * @dev: The struct ps3_system_bus_device instance.
+ *
+ * Cleans all memory, interrupts and HV resources.  After this call the
+ * device can no longer be used.
+ */
+
+static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
+{
+        struct ps3_vuart_port_priv *priv = to_port_priv(dev);
+        struct ps3_vuart_port_driver *drv;
+
+        BUG_ON(!dev);
 
         down(&vuart_bus_priv.probe_mutex);
 
-        dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
-                dev->core.bus_id);
+        dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
+                dev->match_id);
 
-        BUG_ON(vuart_bus_priv.use_count < 1);
+        if (!dev->core.driver) {
+                dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
+                        __LINE__);
+                up(&vuart_bus_priv.probe_mutex);
+                return 0;
+        }
 
-        if (drv->remove)
-                drv->remove(dev);
-        else
-                dev_dbg(&dev->core, "%s:%d: %s no remove method\n", __func__,
-                        __LINE__, dev->core.bus_id);
+        drv = ps3_system_bus_dev_to_vuart_drv(dev);
 
-        vuart_bus_priv.devices[dev->priv->port_number] = NULL;
+        BUG_ON(!drv);
 
-        if (--vuart_bus_priv.use_count == 0) {
+        if (drv->remove) {
+                drv->remove(dev);
+        } else {
+                dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__,
+                __LINE__);
                 BUG();
-                free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
-                ps3_vuart_irq_destroy(vuart_bus_priv.virq);
-                vuart_bus_priv.virq = NO_IRQ;
         }
 
-        kfree(dev->priv);
-        dev->priv = NULL;
+        ps3_vuart_cleanup(dev);
+
+        vuart_bus_priv.devices[dev->port_number] = NULL;
+        kfree(priv);
+        priv = NULL;
 
+        dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
         up(&vuart_bus_priv.probe_mutex);
         return 0;
 }
 
-static void ps3_vuart_shutdown(struct device *_dev)
-{
-        struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
-        struct ps3_vuart_port_driver *drv =
-                to_ps3_vuart_port_driver(_dev->driver);
-
-        dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
-                dev->core.bus_id);
-
-        if (drv->shutdown)
-                drv->shutdown(dev);
-        else
-                dev_dbg(&dev->core, "%s:%d: %s no shutdown method\n", __func__,
-                        __LINE__, dev->core.bus_id);
-}
-
 /**
- * ps3_vuart_bus - The vuart bus instance.
+ * ps3_vuart_shutdown - Cleans interrupts and HV resources.
+ * @dev: The struct ps3_system_bus_device instance.
  *
- * The vuart is managed as a bus that port devices connect to.
+ * Cleans interrupts and HV resources.  After this call the
+ * device can still be used in polling mode.  This behavior required
+ * by sys-manager to be able to complete the device power operation
+ * sequence.
  */
 
-struct bus_type ps3_vuart_bus = {
-        .name = "ps3_vuart",
-        .match = ps3_vuart_match,
-        .probe = ps3_vuart_probe,
-        .remove = ps3_vuart_remove,
-        .shutdown = ps3_vuart_shutdown,
-};
-
-int __init ps3_vuart_bus_init(void)
+static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
 {
-        int result;
+        struct ps3_vuart_port_driver *drv;
 
-        pr_debug("%s:%d:\n", __func__, __LINE__);
+        BUG_ON(!dev);
 
-        if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
-                return -ENODEV;
+        down(&vuart_bus_priv.probe_mutex);
 
-        init_MUTEX(&vuart_bus_priv.probe_mutex);
-        result = bus_register(&ps3_vuart_bus);
-        BUG_ON(result);
+        dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
+                dev->match_id);
 
-        return result;
-}
+        if (!dev->core.driver) {
+                dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
+                        __LINE__);
+                up(&vuart_bus_priv.probe_mutex);
+                return 0;
+        }
 
-void __exit ps3_vuart_bus_exit(void)
-{
-        pr_debug("%s:%d:\n", __func__, __LINE__);
-        bus_unregister(&ps3_vuart_bus);
-}
+        drv = ps3_system_bus_dev_to_vuart_drv(dev);
 
-core_initcall(ps3_vuart_bus_init);
-module_exit(ps3_vuart_bus_exit);
+        BUG_ON(!drv);
 
-/**
- * ps3_vuart_port_release_device - Remove a vuart port device.
- */
+        if (drv->shutdown)
+                drv->shutdown(dev);
+        else if (drv->remove) {
+                dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n",
+                        __func__, __LINE__);
+                drv->remove(dev);
+        } else {
+                dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__,
+                        __LINE__);
+                BUG();
+        }
 
-static void ps3_vuart_port_release_device(struct device *_dev)
-{
-#if defined(DEBUG)
-        struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
+        ps3_vuart_cleanup(dev);
 
-        dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
+        dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
 
-        BUG_ON(dev->priv && "forgot to free");
-        memset(&dev->core, 0, sizeof(dev->core));
-#endif
+        up(&vuart_bus_priv.probe_mutex);
+        return 0;
 }
 
-/**
- * ps3_vuart_port_device_register - Add a vuart port device.
- */
-
-int ps3_vuart_port_device_register(struct ps3_vuart_port_device *dev)
+static int __init ps3_vuart_bus_init(void)
 {
-        static unsigned int dev_count = 1;
-
-        BUG_ON(dev->priv && "forgot to free");
+        pr_debug("%s:%d:\n", __func__, __LINE__);
 
-        dev->core.parent = NULL;
-        dev->core.bus = &ps3_vuart_bus;
-        dev->core.release = ps3_vuart_port_release_device;
+        if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
+                return -ENODEV;
 
-        snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "vuart_%02x",
-                dev_count++);
+        init_MUTEX(&vuart_bus_priv.probe_mutex);
 
-        dev_dbg(&dev->core, "%s:%d register\n", __func__, __LINE__);
+        return 0;
+}
 
-        return device_register(&dev->core);
+static void __exit ps3_vuart_bus_exit(void)
+{
+        pr_debug("%s:%d:\n", __func__, __LINE__);
 }
 
-EXPORT_SYMBOL_GPL(ps3_vuart_port_device_register);
+core_initcall(ps3_vuart_bus_init);
+module_exit(ps3_vuart_bus_exit);
 
 /**
  * ps3_vuart_port_driver_register - Add a vuart port device driver.
@@ -1089,12 +1245,18 @@ int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
 {
         int result;
 
-        pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
-        drv->core.bus = &ps3_vuart_bus;
-        result = driver_register(&drv->core);
+        pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
+
+        BUG_ON(!drv->core.match_id);
+        BUG_ON(!drv->core.core.name);
+
+        drv->core.probe = ps3_vuart_probe;
+        drv->core.remove = ps3_vuart_remove;
+        drv->core.shutdown = ps3_vuart_shutdown;
+
+        result = ps3_system_bus_driver_register(&drv->core);
         return result;
 }
-
 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
 
 /**
@@ -1103,8 +1265,7 @@ EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
 
 void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
 {
-        pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
-        driver_unregister(&drv->core);
+        pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
+        ps3_system_bus_driver_unregister(&drv->core);
 }
-
 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);
diff --git a/drivers/ps3/vuart.h b/drivers/ps3/vuart.h
index 1be992d568c8..eb7f6d94a890 100644
--- a/drivers/ps3/vuart.h
+++ b/drivers/ps3/vuart.h
@@ -34,29 +34,7 @@ struct ps3_vuart_stats {
 struct ps3_vuart_work {
         struct work_struct work;
         unsigned long trigger;
-        spinlock_t lock;
-        struct ps3_vuart_port_device* dev; /* to convert work to device */
-};
-
-/**
- * struct ps3_vuart_port_priv - private vuart device data.
- */
-
-struct ps3_vuart_port_priv {
-        unsigned int port_number;
-        u64 interrupt_mask;
-
-        struct {
-                spinlock_t lock;
-                struct list_head head;
-        } tx_list;
-        struct {
-                unsigned long bytes_held;
-                spinlock_t lock;
-                struct list_head head;
-        } rx_list;
-        struct ps3_vuart_stats stats;
-        struct ps3_vuart_work work;
+        struct ps3_system_bus_device *dev; /* to convert work to device */
 };
 
 /**
@@ -64,32 +42,30 @@ struct ps3_vuart_port_priv {
  */
 
 struct ps3_vuart_port_driver {
-        enum ps3_match_id match_id;
-        struct device_driver core;
-        int (*probe)(struct ps3_vuart_port_device *);
-        int (*remove)(struct ps3_vuart_port_device *);
-        void (*shutdown)(struct ps3_vuart_port_device *);
-        int (*tx_event)(struct ps3_vuart_port_device *dev);
-        int (*rx_event)(struct ps3_vuart_port_device *dev);
-        int (*disconnect_event)(struct ps3_vuart_port_device *dev);
-        /* int (*suspend)(struct ps3_vuart_port_device *, pm_message_t); */
-        /* int (*resume)(struct ps3_vuart_port_device *); */
+        struct ps3_system_bus_driver core;
+        int (*probe)(struct ps3_system_bus_device *);
+        int (*remove)(struct ps3_system_bus_device *);
+        void (*shutdown)(struct ps3_system_bus_device *);
+        void (*work)(struct ps3_system_bus_device *);
+        /* int (*tx_event)(struct ps3_system_bus_device *dev); */
+        /* int (*rx_event)(struct ps3_system_bus_device *dev); */
+        /* int (*disconnect_event)(struct ps3_system_bus_device *dev); */
+        /* int (*suspend)(struct ps3_system_bus_device *, pm_message_t); */
+        /* int (*resume)(struct ps3_system_bus_device *); */
 };
 
 int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv);
 void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv);
 
-static inline struct ps3_vuart_port_driver *to_ps3_vuart_port_driver(
-        struct device_driver *_drv)
-{
-        return container_of(_drv, struct ps3_vuart_port_driver, core);
-}
-static inline struct ps3_vuart_port_device *to_ps3_vuart_port_device(
-        struct device *_dev)
+static inline struct ps3_vuart_port_driver *
+        ps3_system_bus_dev_to_vuart_drv(struct ps3_system_bus_device *_dev)
 {
-        return container_of(_dev, struct ps3_vuart_port_device, core);
+        struct ps3_system_bus_driver *sbd =
+                ps3_system_bus_dev_to_system_bus_drv(_dev);
+        BUG_ON(!sbd);
+        return container_of(sbd, struct ps3_vuart_port_driver, core);
 }
-static inline struct ps3_vuart_port_device *ps3_vuart_work_to_port_device(
+static inline struct ps3_system_bus_device *ps3_vuart_work_to_system_bus_dev(
         struct work_struct *_work)
 {
         struct ps3_vuart_work *vw = container_of(_work, struct ps3_vuart_work,
@@ -97,14 +73,13 @@ static inline struct ps3_vuart_port_device *ps3_vuart_work_to_port_device(
         return vw->dev;
 }
 
-int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
-        unsigned int bytes);
-int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
+int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
         unsigned int bytes);
-int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
+int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
         unsigned int bytes);
-void ps3_vuart_cancel_async(struct ps3_vuart_port_device *dev);
-void ps3_vuart_clear_rx_bytes(struct ps3_vuart_port_device *dev,
+int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes);
+void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev);
+void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
         unsigned int bytes);
 
 #endif