1 files changed, 76 insertions, 15 deletions

diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index 19e5f32a8a64..c3f35f11a8fd 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -86,7 +86,7 @@ struct cpdma_desc_pool {
 	void __iomem		*iomap;		/* ioremap map */
 	void			*cpumap;	/* dma_alloc map */
 	int			desc_size, mem_size;
-	int			num_desc, used_desc;
+	int			num_desc;
 	struct device		*dev;
 	struct gen_pool		*gen_pool;
 };
@@ -104,6 +104,7 @@ struct cpdma_ctlr {
 	struct cpdma_desc_pool	*pool;
 	spinlock_t		lock;
 	struct cpdma_chan	*channels[2 * CPDMA_MAX_CHANNELS];
+	int chan_num;
 };
 
 struct cpdma_chan {
@@ -123,6 +124,13 @@ struct cpdma_chan {
 	int	int_set, int_clear, td;
 };
 
+#define tx_chan_num(chan)	(chan)
+#define rx_chan_num(chan)	((chan) + CPDMA_MAX_CHANNELS)
+#define is_rx_chan(chan)	((chan)->chan_num >= CPDMA_MAX_CHANNELS)
+#define is_tx_chan(chan)	(!is_rx_chan(chan))
+#define __chan_linear(chan_num)	((chan_num) & (CPDMA_MAX_CHANNELS - 1))
+#define chan_linear(chan)	__chan_linear((chan)->chan_num)
+
 /* The following make access to common cpdma_ctlr params more readable */
 #define dmaregs		params.dmaregs
 #define num_chan	params.num_chan
@@ -148,7 +156,10 @@ static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
 	if (!pool)
 		return;
 
-	WARN_ON(pool->used_desc);
+	WARN(gen_pool_size(pool->gen_pool) != gen_pool_avail(pool->gen_pool),
+	     "cpdma_desc_pool size %d != avail %d",
+	     gen_pool_size(pool->gen_pool),
+	     gen_pool_avail(pool->gen_pool));
 	if (pool->cpumap)
 		dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
 				  pool->phys);
@@ -232,21 +243,14 @@ desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
 static struct cpdma_desc __iomem *
 cpdma_desc_alloc(struct cpdma_desc_pool *pool)
 {
-	struct cpdma_desc __iomem *desc = NULL;
-
-	desc = (struct cpdma_desc __iomem *)gen_pool_alloc(pool->gen_pool,
-							   pool->desc_size);
-	if (desc)
-		pool->used_desc++;
-
-	return desc;
+	return (struct cpdma_desc __iomem *)
+		gen_pool_alloc(pool->gen_pool, pool->desc_size);
 }
 
 static void cpdma_desc_free(struct cpdma_desc_pool *pool,
 			    struct cpdma_desc __iomem *desc, int num_desc)
 {
 	gen_pool_free(pool->gen_pool, (unsigned long)desc, pool->desc_size);
-	pool->used_desc--;
 }
 
 struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
@@ -260,6 +264,7 @@ struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
 	ctlr->state = CPDMA_STATE_IDLE;
 	ctlr->params = *params;
 	ctlr->dev = params->dev;
+	ctlr->chan_num = 0;
 	spin_lock_init(&ctlr->lock);
 
 	ctlr->pool = cpdma_desc_pool_create(ctlr->dev,
@@ -336,12 +341,14 @@ int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr)
 	}
 
 	ctlr->state = CPDMA_STATE_TEARDOWN;
+	spin_unlock_irqrestore(&ctlr->lock, flags);
 
 	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
 		if (ctlr->channels[i])
 			cpdma_chan_stop(ctlr->channels[i]);
 	}
 
+	spin_lock_irqsave(&ctlr->lock, flags);
 	dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
 	dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
 
@@ -403,13 +410,52 @@ void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value)
 }
 EXPORT_SYMBOL_GPL(cpdma_ctlr_eoi);
 
+u32 cpdma_ctrl_rxchs_state(struct cpdma_ctlr *ctlr)
+{
+	return dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED);
+}
+EXPORT_SYMBOL_GPL(cpdma_ctrl_rxchs_state);
+
+u32 cpdma_ctrl_txchs_state(struct cpdma_ctlr *ctlr)
+{
+	return dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED);
+}
+EXPORT_SYMBOL_GPL(cpdma_ctrl_txchs_state);
+
+/**
+ * cpdma_chan_split_pool - Splits ctrl pool between all channels.
+ * Has to be called under ctlr lock
+ */
+static void cpdma_chan_split_pool(struct cpdma_ctlr *ctlr)
+{
+	struct cpdma_desc_pool *pool = ctlr->pool;
+	struct cpdma_chan *chan;
+	int ch_desc_num;
+	int i;
+
+	if (!ctlr->chan_num)
+		return;
+
+	/* calculate average size of pool slice */
+	ch_desc_num = pool->num_desc / ctlr->chan_num;
+
+	/* split ctlr pool */
+	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
+		chan = ctlr->channels[i];
+		if (chan)
+			chan->desc_num = ch_desc_num;
+	}
+}
+
 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
-				     cpdma_handler_fn handler)
+				     cpdma_handler_fn handler, int rx_type)
 {
+	int offset = chan_num * 4;
 	struct cpdma_chan *chan;
-	int offset = (chan_num % CPDMA_MAX_CHANNELS) * 4;
 	unsigned long flags;
 
+	chan_num = rx_type ? rx_chan_num(chan_num) : tx_chan_num(chan_num);
+
 	if (__chan_linear(chan_num) >= ctlr->num_chan)
 		return NULL;
 
@@ -451,14 +497,25 @@ struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
 	spin_lock_init(&chan->lock);
 
 	ctlr->channels[chan_num] = chan;
+	ctlr->chan_num++;
+
+	cpdma_chan_split_pool(ctlr);
+
 	spin_unlock_irqrestore(&ctlr->lock, flags);
 	return chan;
 }
 EXPORT_SYMBOL_GPL(cpdma_chan_create);
 
-int cpdma_chan_get_rx_buf_num(struct cpdma_ctlr *ctlr)
+int cpdma_chan_get_rx_buf_num(struct cpdma_chan *chan)
 {
-	return ctlr->pool->num_desc / 2;
+	unsigned long flags;
+	int desc_num;
+
+	spin_lock_irqsave(&chan->lock, flags);
+	desc_num = chan->desc_num;
+	spin_unlock_irqrestore(&chan->lock, flags);
+
+	return desc_num;
 }
 EXPORT_SYMBOL_GPL(cpdma_chan_get_rx_buf_num);
 
@@ -475,6 +532,10 @@ int cpdma_chan_destroy(struct cpdma_chan *chan)
 	if (chan->state != CPDMA_STATE_IDLE)
 		cpdma_chan_stop(chan);
 	ctlr->channels[chan->chan_num] = NULL;
+	ctlr->chan_num--;
+
+	cpdma_chan_split_pool(ctlr);
+
 	spin_unlock_irqrestore(&ctlr->lock, flags);
 	return 0;
 }