soc: ti: add knav_dma_get_flow() to retrieve flow of given channel

Some devices using packet DMA (e.g. PA, SRIO) need to configure additional hw registers based on flow Ids. Add a function to retrieve this flow Id from a given channel for a DMA client. While at it, also fix some typos. Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Murali Karicheri <m-karicheri@ti.com>

soc: ti: add knav_dma_get_flow() to retrieve flow of given channel
Some devices using packet DMA (e.g. PA, SRIO) need to configure additional hw registers based on flow Ids. Add a function to retrieve this flow Id from a given channel for a DMA client. While at it, also fix some typos. Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Murali Karicheri <m-karicheri@ti.com>
Aurelien Jacquiot · Hongmei Gou
1 parent e313352352
Showing 2 changed files with 25 additions and 2 deletions Side-by-side Diff
drivers/soc/ti/knav_dma.c
include/linux/soc/ti/knav_dma.h
@@ -401,7 +401,7 @@
  
 	if (of_parse_phandle_with_fixed_args(np, "ti,navigator-dmas",
 					1, index, &args)) {
-		dev_err(kdev->dev, "Missing the pahndle args name %s\n", name);
+		dev_err(kdev->dev, "Missing the phandle args name %s\n", name);
 		return -ENODEV;
 	}
  
@@ -414,6 +414,28 @@
 }
  
 /**
+ * knav_dma_get_flow() - retrieve flow Id from a given channel handle
+ * @channel     dma channel handle
+ *
+ * Returns corresponding flow Id on success or -EINVAL in case of error
+ */
+int knav_dma_get_flow(void *channel)
+{
+	struct knav_dma_chan *chan = channel;
+
+	if (!chan)
+		return -EINVAL;
+
+	if (!kdev) {
+		pr_err("keystone-navigator-dma driver not registered\n");
+		return -EINVAL;
+	}
+
+	return chan->flow;
+}
+EXPORT_SYMBOL_GPL(knav_dma_get_flow);
+
+/**
  * knav_dma_open_channel() - try to setup an exclusive slave channel
  * @dev:	pointer to client device structure
  * @name:	slave channel name
@@ -442,7 +464,7 @@
 	}
  
 	dev_dbg(kdev->dev, "initializing %s channel %d from DMA %s\n",
-		  config->direction == DMA_MEM_TO_DEV   ? "transmit" :
+		  config->direction == DMA_MEM_TO_DEV ? "transmit" :
 		  config->direction == DMA_DEV_TO_MEM ? "receive"  :
 		  "unknown", chan_num, instance);
  
@@ -162,6 +162,7 @@
 				struct knav_dma_cfg *config);
 void knav_dma_close_channel(void *channel);
 bool knav_dma_device_ready(void);
+int knav_dma_get_flow(void *channel);
 #else
 static inline void *knav_dma_open_channel(struct device *dev, const char *name,
 				struct knav_dma_cfg *config)
...	...	@@ -401,7 +401,7 @@
401	401
402	402	if (of_parse_phandle_with_fixed_args(np, "ti,navigator-dmas",
403	403	1, index, &args)) {
404		- dev_err(kdev->dev, "Missing the pahndle args name %s\n", name);
	404	+ dev_err(kdev->dev, "Missing the phandle args name %s\n", name);
405	405	return -ENODEV;
406	406	}
407	407
...	...	@@ -414,6 +414,28 @@
414	414	}
415	415
416	416	/**
	417	+ * knav_dma_get_flow() - retrieve flow Id from a given channel handle
	418	+ * @channel dma channel handle
	419	+ *
	420	+ * Returns corresponding flow Id on success or -EINVAL in case of error
	421	+ */
	422	+int knav_dma_get_flow(void *channel)
	423	+{
	424	+ struct knav_dma_chan *chan = channel;
	425	+
	426	+ if (!chan)
	427	+ return -EINVAL;
	428	+
	429	+ if (!kdev) {
	430	+ pr_err("keystone-navigator-dma driver not registered\n");
	431	+ return -EINVAL;
	432	+ }
	433	+
	434	+ return chan->flow;
	435	+}
	436	+EXPORT_SYMBOL_GPL(knav_dma_get_flow);
	437	+
	438	+/**
417	439	* knav_dma_open_channel() - try to setup an exclusive slave channel
418	440	* @dev: pointer to client device structure
419	441	* @name: slave channel name
...	...	@@ -442,7 +464,7 @@
442	464	}
443	465
444	466	dev_dbg(kdev->dev, "initializing %s channel %d from DMA %s\n",
445		- config->direction == DMA_MEM_TO_DEV ? "transmit" :
	467	+ config->direction == DMA_MEM_TO_DEV ? "transmit" :
446	468	config->direction == DMA_DEV_TO_MEM ? "receive" :
447	469	"unknown", chan_num, instance);
448	470
...	...	@@ -162,6 +162,7 @@
162	162	struct knav_dma_cfg *config);
163	163	void knav_dma_close_channel(void *channel);
164	164	bool knav_dma_device_ready(void);
	165	+int knav_dma_get_flow(void *channel);
165	166	#else
166	167	static inline void knav_dma_open_channel(struct device dev, const char *name,
167	168	struct knav_dma_cfg *config)