[media] exynos4-is: Add the FIMC-IS ISP capture DMA driver

Add a video capture node for the FIMC-IS ISP IP block. The Exynos4x12
FIMC-IS ISP IP block has 2 DMA interfaces that allow to capture raw
Bayer and YUV data to memory.  Currently only the DMA2 output is and
raw Bayer data capture is supported.

Signed-off-by: Sylwester Nawrocki <[email protected]>
Acked-by: Kyungmin Park <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

Author: Sylwester Nawrocki

drivers/media/platform/exynos4-is/Kconfig

@@ -64,4 +64,13 @@ config VIDEO_EXYNOS4_FIMC_IS
 	  To compile this driver as a module, choose M here: the
 	  module will be called exynos4-fimc-is.
 
+config VIDEO_EXYNOS4_ISP_DMA_CAPTURE
+	bool "EXYNOS4x12 FIMC-IS ISP Direct DMA capture support"
+	depends on VIDEO_EXYNOS4_FIMC_IS
+	select VIDEO_EXYNOS4_IS_COMMON
+	default y
+	  help
+	  This option enables an additional video device node exposing a V4L2
+	  video capture interface for the FIMC-IS ISP raw (Bayer) capture DMA.
+
 endif # VIDEO_SAMSUNG_EXYNOS4_IS

drivers/media/platform/exynos4-is/Makefile

@@ -6,6 +6,10 @@ exynos4-is-common-objs := common.o
 exynos-fimc-is-objs := fimc-is.o fimc-isp.o fimc-is-sensor.o fimc-is-regs.o
 exynos-fimc-is-objs += fimc-is-param.o fimc-is-errno.o fimc-is-i2c.o
 
+ifeq ($(CONFIG_VIDEO_EXYNOS4_ISP_DMA_CAPTURE),y)
+exynos-fimc-is-objs += fimc-isp-video.o
+endif
+
 obj-$(CONFIG_VIDEO_S5P_MIPI_CSIS)	+= s5p-csis.o
 obj-$(CONFIG_VIDEO_EXYNOS_FIMC_LITE)	+= exynos-fimc-lite.o
 obj-$(CONFIG_VIDEO_EXYNOS4_FIMC_IS)	+= exynos-fimc-is.o

drivers/media/platform/exynos4-is/fimc-is-param.c

@@ -56,7 +56,7 @@ static void __fimc_is_hw_update_param_sensor_framerate(struct fimc_is *is)
 	__hw_param_copy(dst, src);
 }
 
-static int __fimc_is_hw_update_param(struct fimc_is *is, u32 offset)
+int __fimc_is_hw_update_param(struct fimc_is *is, u32 offset)
 {
 	struct is_param_region *par = &is->is_p_region->parameter;
 	struct chain_config *cfg = &is->config[is->config_index];

drivers/media/platform/exynos4-is/fimc-is-param.h

@@ -911,6 +911,10 @@ struct is_region {
 	u32 shared[MAX_SHARED_COUNT];
 } __packed;
 
+/* Offset to the ISP DMA2 output buffer address array. */
+#define DMA2_OUTPUT_ADDR_ARRAY_OFFS \
+	(offsetof(struct is_region, shared) + 32 * sizeof(u32))
+
 struct is_debug_frame_descriptor {
 	u32 sensor_frame_time;
 	u32 sensor_exposure_time;
@@ -988,6 +992,7 @@ struct sensor_open_extended {
 struct fimc_is;
 
 int fimc_is_hw_get_sensor_max_framerate(struct fimc_is *is);
+int __fimc_is_hw_update_param(struct fimc_is *is, u32 offset);
 void fimc_is_set_initial_params(struct fimc_is *is);
 unsigned int __get_pending_param_count(struct fimc_is *is);
 

drivers/media/platform/exynos4-is/fimc-is-regs.c

@@ -105,6 +105,20 @@ int fimc_is_hw_get_params(struct fimc_is *is, unsigned int num_args)
 	return 0;
 }
 
+void fimc_is_hw_set_isp_buf_mask(struct fimc_is *is, unsigned int mask)
+{
+	if (hweight32(mask) == 1) {
+		dev_err(&is->pdev->dev, "%s(): not enough buffers (mask %#x)\n",
+							__func__, mask);
+		return;
+	}
+
+	if (mcuctl_read(is, MCUCTL_REG_ISSR(23)) != 0)
+		dev_dbg(&is->pdev->dev, "non-zero DMA buffer mask\n");
+
+	mcuctl_write(mask, is, MCUCTL_REG_ISSR(23));
+}
+
 void fimc_is_hw_set_sensor_num(struct fimc_is *is)
 {
 	pr_debug("setting sensor index to: %d\n", is->sensor_index);

drivers/media/platform/exynos4-is/fimc-is-regs.h

@@ -147,6 +147,7 @@ int fimc_is_hw_get_params(struct fimc_is *is, unsigned int num);
 void fimc_is_hw_set_intgr0_gd0(struct fimc_is *is);
 int fimc_is_hw_wait_intmsr0_intmsd0(struct fimc_is *is);
 void fimc_is_hw_set_sensor_num(struct fimc_is *is);
+void fimc_is_hw_set_isp_buf_mask(struct fimc_is *is, unsigned int mask);
 void fimc_is_hw_stream_on(struct fimc_is *is);
 void fimc_is_hw_stream_off(struct fimc_is *is);
 int fimc_is_hw_set_param(struct fimc_is *is);

drivers/media/platform/exynos4-is/fimc-is.c

@@ -204,6 +204,9 @@ static int fimc_is_register_subdevs(struct fimc_is *is)
 	if (ret < 0)
 		return ret;
 
+	/* Initialize memory allocator context for the ISP DMA. */
+	is->isp.alloc_ctx = is->alloc_ctx;
+
 	for_each_compatible_node(i2c_bus, NULL, FIMC_IS_I2C_COMPATIBLE) {
 		for_each_available_child_of_node(i2c_bus, child) {
 			ret = fimc_is_parse_sensor_config(is, index, child);

drivers/media/platform/exynos4-is/fimc-is.h

@@ -292,6 +292,11 @@ static inline struct fimc_is *fimc_isp_to_is(struct fimc_isp *isp)
 	return container_of(isp, struct fimc_is, isp);
 }
 
+static inline struct chain_config *__get_curr_is_config(struct fimc_is *is)
+{
+	return &is->config[is->config_index];
+}
+
 static inline void fimc_is_mem_barrier(void)
 {
 	mb();