drm/exynos: add fimc ipp driver

FIMC is stand for Fully Interfactive Mobile Camera and
supports image scaler/rotator/crop/flip/csc and input/output DMA operations
and also supports writeback and display output operations.

This driver is registered to IPP subsystem framework to be used by user side
and user can control the FIMC hardware through some interfaces of IPP subsystem
framework.

Changelog v6:
- fix build warning.

Changelog v1 ~ v5:
- add comments, code fixups and cleanups.

Signed-off-by: Eunchul Kim <chulspro.kim@samsung.com>
Signed-off-by: Jinyoung Jeon <jy0.jeon@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

drivers/gpu/drm/exynos/Kconfig

@@ -51,3 +51,9 @@ config DRM_EXYNOS_IPP
 	depends on DRM_EXYNOS
 	help
 	  Choose this option if you want to use IPP feature for DRM.
+
+config DRM_EXYNOS_FIMC
+	bool "Exynos DRM FIMC"
+	depends on DRM_EXYNOS_IPP
+	help
+	  Choose this option if you want to use Exynos FIMC for DRM.

drivers/gpu/drm/exynos/Makefile

@@ -17,5 +17,6 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_HDMI)	+= exynos_hdmi.o exynos_mixer.o \
 exynosdrm-$(CONFIG_DRM_EXYNOS_VIDI)	+= exynos_drm_vidi.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_G2D)	+= exynos_drm_g2d.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_IPP)	+= exynos_drm_ipp.o
+exynosdrm-$(CONFIG_DRM_EXYNOS_FIMC)	+= exynos_drm_fimc.o
 
 obj-$(CONFIG_DRM_EXYNOS)		+= exynosdrm.o

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -372,6 +372,12 @@ static int __init exynos_drm_init(void)
 		goto out_g2d;
 #endif
 
+#ifdef CONFIG_DRM_EXYNOS_FIMC
+	ret = platform_driver_register(&fimc_driver);
+	if (ret < 0)
+		goto out_fimc;
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_IPP
 	ret = platform_driver_register(&ipp_driver);
 	if (ret < 0)
@@ -400,6 +406,11 @@ static int __init exynos_drm_init(void)
 out_ipp:
 #endif
 
+#ifdef CONFIG_DRM_EXYNOS_FIMC
+	platform_driver_unregister(&fimc_driver);
+out_fimc:
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_G2D
 	platform_driver_unregister(&g2d_driver);
 out_g2d:
@@ -440,6 +451,10 @@ static void __exit exynos_drm_exit(void)
 	platform_driver_unregister(&ipp_driver);
 #endif
 
+#ifdef CONFIG_DRM_EXYNOS_FIMC
+	platform_driver_unregister(&fimc_driver);
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_G2D
 	platform_driver_unregister(&g2d_driver);
 #endif

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -349,5 +349,6 @@ extern struct platform_driver mixer_driver;
 extern struct platform_driver exynos_drm_common_hdmi_driver;
 extern struct platform_driver vidi_driver;
 extern struct platform_driver g2d_driver;
+extern struct platform_driver fimc_driver;
 extern struct platform_driver ipp_driver;
 #endif