drm/exynos: add rotator ipp driver

This patch adds IPP subsystem-based rotator driver.
And Rotator supports the following features.
- Image crop operation support.
- Rotate operation support to 90, 180 or 270 degree.
- Flip operation support to vertical, horizontal or both.
  . as limitaions, the pixel format to source buffer should be
    same as the one to destination buffer and no scaler.

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

Changelog v6:
- fix build warning.

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

Signed-off-by: Eunchul Kim <chulspro.kim@samsung.com>
Signed-off-by: Youngjun Cho <yj44.cho@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

@@ -57,3 +57,10 @@ config DRM_EXYNOS_FIMC
 	depends on DRM_EXYNOS_IPP
 	help
 	  Choose this option if you want to use Exynos FIMC for DRM.
+
+config DRM_EXYNOS_ROTATOR
+	bool "Exynos DRM Rotator"
+	depends on DRM_EXYNOS_IPP
+	help
+	  Choose this option if you want to use Exynos Rotator for DRM.
+

drivers/gpu/drm/exynos/Makefile

@@ -18,5 +18,6 @@ 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
+exynosdrm-$(CONFIG_DRM_EXYNOS_ROTATOR)	+= exynos_drm_rotator.o
 
 obj-$(CONFIG_DRM_EXYNOS)		+= exynosdrm.o

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -378,6 +378,12 @@ static int __init exynos_drm_init(void)
 		goto out_fimc;
 #endif
 
+#ifdef CONFIG_DRM_EXYNOS_ROTATOR
+	ret = platform_driver_register(&rotator_driver);
+	if (ret < 0)
+		goto out_rotator;
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_IPP
 	ret = platform_driver_register(&ipp_driver);
 	if (ret < 0)
@@ -406,6 +412,11 @@ static int __init exynos_drm_init(void)
 out_ipp:
 #endif
 
+#ifdef CONFIG_DRM_EXYNOS_ROTATOR
+	platform_driver_unregister(&rotator_driver);
+out_rotator:
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_FIMC
 	platform_driver_unregister(&fimc_driver);
 out_fimc:
@@ -451,6 +462,10 @@ static void __exit exynos_drm_exit(void)
 	platform_driver_unregister(&ipp_driver);
 #endif
 
+#ifdef CONFIG_DRM_EXYNOS_ROTATOR
+	platform_driver_unregister(&rotator_driver);
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_FIMC
 	platform_driver_unregister(&fimc_driver);
 #endif

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -350,5 +350,6 @@ 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 rotator_driver;
 extern struct platform_driver ipp_driver;
 #endif