[POWERPC] PS3: Vuart add async read

Add asynchronous read support to the PS3 vuart driver.  This is needed to
support the PS3 system manager driver.

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

2 files changed, 78 insertions, 4 deletions

diff --git a/drivers/ps3/vuart.c b/drivers/ps3/vuart.c
index 90b3d1ca5172..746298107d6f 100644
--- a/drivers/ps3/vuart.c
+++ b/drivers/ps3/vuart.c
@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
+#include <linux/workqueue.h>
 #include <asm/ps3.h>
 
 #include <asm/firmware.h>
@@ -567,6 +568,44 @@ int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
         return 0;
 }
 
+int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
+        unsigned int bytes)
+{
+        unsigned long flags;
+
+        if(dev->priv->work.trigger) {
+                dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
+                        __func__, __LINE__);
+                return -EAGAIN;
+        }
+
+        BUG_ON(!bytes);
+
+        PREPARE_WORK(&dev->priv->work.work, func);
+
+        spin_lock_irqsave(&dev->priv->work.lock, flags);
+        if(dev->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);
+                return 0;
+        }
+
+        dev->priv->work.trigger = bytes;
+        spin_unlock_irqrestore(&dev->priv->work.lock, flags);
+
+        dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
+                __LINE__, bytes, bytes);
+
+        return 0;
+}
+
+void ps3_vuart_cancel_async(struct ps3_vuart_port_device *dev)
+{
+        dev->priv->work.trigger = 0;
+}
+
 /**
  * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
  *
@@ -674,6 +713,15 @@ static int ps3_vuart_handle_interrupt_rx(struct ps3_vuart_port_device *dev)
         dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
                 __func__, __LINE__, lb->dbg_number, bytes);
 
+        spin_lock_irqsave(&dev->priv->work.lock, flags);
+        if(dev->priv->work.trigger
+                && dev->priv->rx_list.bytes_held >= dev->priv->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);
+        }
+        spin_unlock_irqrestore(&dev->priv->work.lock, flags);
         return 0;
 }
 
@@ -839,6 +887,11 @@ static int ps3_vuart_probe(struct device *_dev)
         INIT_LIST_HEAD(&dev->priv->rx_list.head);
         spin_lock_init(&dev->priv->rx_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;
+
         if (++vuart_bus_priv.use_count == 1) {
 
                 result = ps3_alloc_vuart_irq(PS3_BINDING_CPU_ANY,
diff --git a/drivers/ps3/vuart.h b/drivers/ps3/vuart.h
index 34b360da9ff9..1be992d568c8 100644
--- a/drivers/ps3/vuart.h
+++ b/drivers/ps3/vuart.h
@@ -31,6 +31,13 @@ struct ps3_vuart_stats {
         unsigned long disconnect_interrupts;
 };
 
+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.
  */
@@ -49,6 +56,7 @@ struct ps3_vuart_port_priv {
                 struct list_head head;
         } rx_list;
         struct ps3_vuart_stats stats;
+        struct ps3_vuart_work work;
 };
 
 /**
@@ -71,10 +79,6 @@ struct ps3_vuart_port_driver {
 int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv);
 void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv);
 
-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,
-        unsigned int bytes);
 static inline struct ps3_vuart_port_driver *to_ps3_vuart_port_driver(
         struct device_driver *_drv)
 {
@@ -85,5 +89,22 @@ static inline struct ps3_vuart_port_device *to_ps3_vuart_port_device(
 {
         return container_of(_dev, struct ps3_vuart_port_device, core);
 }
+static inline struct ps3_vuart_port_device *ps3_vuart_work_to_port_device(
+        struct work_struct *_work)
+{
+        struct ps3_vuart_work *vw = container_of(_work, struct ps3_vuart_work,
+                work);
+        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,
+        unsigned int bytes);
+int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
+        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,
+        unsigned int bytes);
 
 #endif