V4L/DVB (12906d): V4L : vpif updates for DM6467 vpif capture driver

Following changes done for vpif driver to support vpif capture:-
	1) Current version of display driver defined vpif register
	   space as part for vpif display platform driver resource
	   This is not correct since vpif is common across capture
	   and display drivers. So the resource iomap function is
	   moved to this module
	2) Since there are common registers, a spinlock is added for
	   mutual exclusion.

This has incorporated comments against version v0 of the patch series

Resending to merge to V4L linux-next
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Muralidharan Karicheri <m-karicheri2@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/davinci/vpif.c

@@ -19,7 +19,11 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
 #include <linux/kernel.h>
+#include <linux/io.h>
+#include <mach/hardware.h>
 
 #include "vpif.h"
 
@@ -31,6 +35,12 @@ MODULE_LICENSE("GPL");
 #define VPIF_CH2_MAX_MODES	(15)
 #define VPIF_CH3_MAX_MODES	(02)
 
+static resource_size_t	res_len;
+static struct resource	*res;
+spinlock_t vpif_lock;
+
+void __iomem *vpif_base;
+
 static inline void vpif_wr_bit(u32 reg, u32 bit, u32 val)
 {
 	if (val)
@@ -151,17 +161,17 @@ static void config_vpif_params(struct vpif_params *vpifparams,
 		else if (config->capture_format) {
 			/* Set the polarity of various pins */
 			vpif_wr_bit(reg, VPIF_CH_FID_POLARITY_BIT,
-					vpifparams->params.raw_params.fid_pol);
+					vpifparams->iface.fid_pol);
 			vpif_wr_bit(reg, VPIF_CH_V_VALID_POLARITY_BIT,
-					vpifparams->params.raw_params.vd_pol);
+					vpifparams->iface.vd_pol);
 			vpif_wr_bit(reg, VPIF_CH_H_VALID_POLARITY_BIT,
-					vpifparams->params.raw_params.hd_pol);
+					vpifparams->iface.hd_pol);
 
 			value = regr(reg);
 			/* Set data width */
 			value &= ((~(unsigned int)(0x3)) <<
 					VPIF_CH_DATA_WIDTH_BIT);
-			value |= ((vpifparams->params.raw_params.data_sz) <<
+			value |= ((vpifparams->params.data_sz) <<
 						     VPIF_CH_DATA_WIDTH_BIT);
 			regw(value, reg);
 		}
@@ -227,8 +237,60 @@ int vpif_channel_getfid(u8 channel_id)
 }
 EXPORT_SYMBOL(vpif_channel_getfid);
 
-void vpif_base_addr_init(void __iomem *base)
+static int __init vpif_probe(struct platform_device *pdev)
+{
+	int status = 0;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOENT;
+
+	res_len = res->end - res->start + 1;
+
+	res = request_mem_region(res->start, res_len, res->name);
+	if (!res)
+		return -EBUSY;
+
+	vpif_base = ioremap(res->start, res_len);
+	if (!vpif_base) {
+		status = -EBUSY;
+		goto fail;
+	}
+
+	spin_lock_init(&vpif_lock);
+	dev_info(&pdev->dev, "vpif probe success\n");
+	return 0;
+
+fail:
+	release_mem_region(res->start, res_len);
+	return status;
+}
+
+static int vpif_remove(struct platform_device *pdev)
 {
-	vpif_base = base;
+	iounmap(vpif_base);
+	release_mem_region(res->start, res_len);
+	return 0;
 }
-EXPORT_SYMBOL(vpif_base_addr_init);
+
+static struct platform_driver vpif_driver = {
+	.driver = {
+		.name	= "vpif",
+		.owner = THIS_MODULE,
+	},
+	.remove = __devexit_p(vpif_remove),
+	.probe = vpif_probe,
+};
+
+static void vpif_exit(void)
+{
+	platform_driver_unregister(&vpif_driver);
+}
+
+static int __init vpif_init(void)
+{
+	return platform_driver_register(&vpif_driver);
+}
+subsys_initcall(vpif_init);
+module_exit(vpif_exit);
+

drivers/media/video/davinci/vpif.h

@@ -19,6 +19,7 @@
 #include <linux/io.h>
 #include <linux/videodev2.h>
 #include <mach/hardware.h>
+#include <mach/dm646x.h>
 
 /* Maximum channel allowed */
 #define VPIF_NUM_CHANNELS		(4)
@@ -26,7 +27,9 @@
 #define VPIF_DISPLAY_NUM_CHANNELS	(2)
 
 /* Macros to read/write registers */
-static void __iomem *vpif_base;
+extern void __iomem *vpif_base;
+extern spinlock_t vpif_lock;
+
 #define regr(reg)               readl((reg) + vpif_base)
 #define regw(value, reg)        writel(value, (reg + vpif_base))
 
@@ -280,6 +283,10 @@ static inline void enable_channel1(int enable)
 /* inline function to enable interrupt for channel0 */
 static inline void channel0_intr_enable(int enable)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&vpif_lock, flags);
+
 	if (enable) {
 		regw((regr(VPIF_INTEN) | 0x10), VPIF_INTEN);
 		regw((regr(VPIF_INTEN_SET) | 0x10), VPIF_INTEN_SET);
@@ -292,11 +299,16 @@ static inline void channel0_intr_enable(int enable)
 		regw((regr(VPIF_INTEN_SET) | VPIF_INTEN_FRAME_CH0),
 							VPIF_INTEN_SET);
 	}
+	spin_unlock_irqrestore(&vpif_lock, flags);
 }
 
 /* inline function to enable interrupt for channel1 */
 static inline void channel1_intr_enable(int enable)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&vpif_lock, flags);
+
 	if (enable) {
 		regw((regr(VPIF_INTEN) | 0x10), VPIF_INTEN);
 		regw((regr(VPIF_INTEN_SET) | 0x10), VPIF_INTEN_SET);
@@ -309,6 +321,7 @@ static inline void channel1_intr_enable(int enable)
 		regw((regr(VPIF_INTEN_SET) | VPIF_INTEN_FRAME_CH1),
 							VPIF_INTEN_SET);
 	}
+	spin_unlock_irqrestore(&vpif_lock, flags);
 }
 
 /* inline function to set buffer addresses in case of Y/C non mux mode */
@@ -431,6 +444,10 @@ static inline void enable_channel3(int enable)
 /* inline function to enable interrupt for channel2 */
 static inline void channel2_intr_enable(int enable)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&vpif_lock, flags);
+
 	if (enable) {
 		regw((regr(VPIF_INTEN) | 0x10), VPIF_INTEN);
 		regw((regr(VPIF_INTEN_SET) | 0x10), VPIF_INTEN_SET);
@@ -442,11 +459,16 @@ static inline void channel2_intr_enable(int enable)
 		regw((regr(VPIF_INTEN_SET) | VPIF_INTEN_FRAME_CH2),
 							VPIF_INTEN_SET);
 	}
+	spin_unlock_irqrestore(&vpif_lock, flags);
 }
 
 /* inline function to enable interrupt for channel3 */
 static inline void channel3_intr_enable(int enable)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&vpif_lock, flags);
+
 	if (enable) {
 		regw((regr(VPIF_INTEN) | 0x10), VPIF_INTEN);
 		regw((regr(VPIF_INTEN_SET) | 0x10), VPIF_INTEN_SET);
@@ -459,6 +481,7 @@ static inline void channel3_intr_enable(int enable)
 		regw((regr(VPIF_INTEN_SET) | VPIF_INTEN_FRAME_CH3),
 							VPIF_INTEN_SET);
 	}
+	spin_unlock_irqrestore(&vpif_lock, flags);
 }
 
 /* inline function to enable raw vbi data for channel2 */
@@ -571,7 +594,7 @@ struct vpif_channel_config_params {
 	v4l2_std_id stdid;
 };
 
-struct vpif_interface;
+struct vpif_video_params;
 struct vpif_params;
 struct vpif_vbi_params;
 
@@ -579,13 +602,6 @@ int vpif_set_video_params(struct vpif_params *vpifparams, u8 channel_id);
 void vpif_set_vbi_display_params(struct vpif_vbi_params *vbiparams,
 							u8 channel_id);
 int vpif_channel_getfid(u8 channel_id);
-void vpif_base_addr_init(void __iomem *base);
-
-/* Enumerated data types */
-enum vpif_capture_pinpol {
-	VPIF_CAPTURE_PINPOL_SAME	= 0,
-	VPIF_CAPTURE_PINPOL_INVERT	= 1
-};
 
 enum data_size {
 	_8BITS = 0,
@@ -593,13 +609,6 @@ enum data_size {
 	_12BITS,
 };
 
-struct vpif_capture_params_raw {
-	enum data_size data_sz;
-	enum vpif_capture_pinpol fid_pol;
-	enum vpif_capture_pinpol vd_pol;
-	enum vpif_capture_pinpol hd_pol;
-};
-
 /* Structure for vpif parameters for raw vbi data */
 struct vpif_vbi_params {
 	__u32 hstart0;  /* Horizontal start of raw vbi data for first field */
@@ -613,18 +622,19 @@ struct vpif_vbi_params {
 };
 
 /* structure for vpif parameters */
-struct vpif_interface {
+struct vpif_video_params {
 	__u8 storage_mode;	/* Indicates field or frame mode */
 	unsigned long hpitch;
 	v4l2_std_id stdid;
 };
 
 struct vpif_params {
-	struct vpif_interface video_params;
+	struct vpif_interface iface;
+	struct vpif_video_params video_params;
 	struct vpif_channel_config_params std_info;
 	union param {
 		struct vpif_vbi_params	vbi_params;
-		struct vpif_capture_params_raw	raw_params;
+		enum data_size data_sz;
 	} params;
 };