staging: drm/imx: Add i.MX drm core support

This patch adds the i.MX glue stuff between i.MX and drm.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/Kconfig

@@ -140,4 +140,6 @@ source "drivers/staging/silicom/Kconfig"
 
 source "drivers/staging/ced1401/Kconfig"
 
+source "drivers/staging/imx-drm/Kconfig"
+
 endif # STAGING

drivers/staging/Makefile

@@ -62,3 +62,4 @@ obj-$(CONFIG_OMAP_BANDGAP)	+= omap-thermal/
 obj-$(CONFIG_ZCACHE2)		+= ramster/
 obj-$(CONFIG_NET_VENDOR_SILICOM)	+= silicom/
 obj-$(CONFIG_CED1401)		+= ced1401/
+obj-$(CONFIG_DRM_IMX)		+= imx-drm/

drivers/staging/imx-drm/Kconfig

+config DRM_IMX
+	tristate "DRM Support for Freescale i.MX"
+	select DRM_KMS_HELPER
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_CMA_HELPER
+	depends on DRM && ARCH_MXC
+	help
+	  enable i.MX graphics support
+
+config DRM_IMX_FB_HELPER
+	tristate "provide legacy framebuffer /dev/fb0"
+	select DRM_KMS_CMA_HELPER
+	depends on DRM_IMX
+	help
+	  The DRM framework can provide a legacy /dev/fb0 framebuffer
+	  for your device. This is necessary to get a framebuffer console
+	  and also for appplications using the legacy framebuffer API

drivers/staging/imx-drm/Makefile

+
+imxdrm-objs := imx-drm-core.o imx-fb.o
+
+obj-$(CONFIG_DRM_IMX) += imxdrm.o
+
+obj-$(CONFIG_DRM_IMX_FB_HELPER) += imx-fbdev.o

drivers/staging/imx-drm/imx-drm.h

+#ifndef _IMX_DRM_H_
+#define _IMX_DRM_H_
+
+struct imx_drm_crtc;
+struct drm_fbdev_cma;
+
+struct imx_drm_crtc_helper_funcs {
+	int (*enable_vblank)(struct drm_crtc *crtc);
+	void (*disable_vblank)(struct drm_crtc *crtc);
+	int (*set_interface_pix_fmt)(struct drm_crtc *crtc, u32 encoder_type,
+			u32 pix_fmt);
+	const struct drm_crtc_helper_funcs *crtc_helper_funcs;
+	const struct drm_crtc_funcs *crtc_funcs;
+};
+
+int imx_drm_add_crtc(struct drm_crtc *crtc,
+		struct imx_drm_crtc **new_crtc,
+		const struct imx_drm_crtc_helper_funcs *imx_helper_funcs,
+		struct module *owner, void *cookie, int id);
+int imx_drm_remove_crtc(struct imx_drm_crtc *);
+int imx_drm_init_drm(struct platform_device *pdev,
+		int preferred_bpp);
+int imx_drm_exit_drm(void);
+
+int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc);
+void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc);
+void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc);
+
+struct imx_drm_encoder;
+int imx_drm_add_encoder(struct drm_encoder *encoder,
+		struct imx_drm_encoder **new_enc,
+		struct module *owner);
+int imx_drm_remove_encoder(struct imx_drm_encoder *);
+
+struct imx_drm_connector;
+int imx_drm_add_connector(struct drm_connector *connector,
+		struct imx_drm_connector **new_con,
+		struct module *owner);
+int imx_drm_remove_connector(struct imx_drm_connector *);
+
+void imx_drm_mode_config_init(struct drm_device *drm);
+
+struct drm_gem_cma_object *imx_drm_fb_get_obj(struct drm_framebuffer *fb);
+
+struct drm_device *imx_drm_device_get(void);
+void imx_drm_device_put(void);
+int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
+		u32 interface_pix_fmt);
+void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper);
+
+struct device_node;
+
+int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
+		struct drm_crtc *crtc);
+int imx_drm_encoder_add_possible_crtcs(struct imx_drm_encoder *imx_drm_encoder,
+		struct device_node *np);
+
+#endif /* _IMX_DRM_H_ */

drivers/staging/imx-drm/imx-fb.c

+/*
+ * i.MX drm driver
+ *
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ *
+ * Based on Samsung Exynos code
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/module.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+
+#include "imx-drm.h"
+
+static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
+	.fb_create = drm_fb_cma_create,
+};
+
+void imx_drm_mode_config_init(struct drm_device *dev)
+{
+	dev->mode_config.min_width = 64;
+	dev->mode_config.min_height = 64;
+
+	/*
+	 * set max width and height as default value(4096x4096).
+	 * this value would be used to check framebuffer size limitation
+	 * at drm_mode_addfb().
+	 */
+	dev->mode_config.max_width = 4096;
+	dev->mode_config.max_height = 4096;
+
+	dev->mode_config.funcs = &imx_drm_mode_config_funcs;
+}

drivers/staging/imx-drm/imx-fbdev.c

+/*
+ * i.MX drm driver
+ *
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ *
+ * Based on Samsung Exynos code
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/module.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+
+#include "imx-drm.h"
+
+#define MAX_CONNECTOR		4
+#define PREFERRED_BPP		16
+
+static struct drm_fbdev_cma *fbdev_cma;
+
+static int legacyfb_depth = 16;
+
+module_param(legacyfb_depth, int, 0444);
+
+static int __init imx_fb_helper_init(void)
+{
+	struct drm_device *drm = imx_drm_device_get();
+
+	if (!drm)
+		return -EINVAL;
+
+	if (legacyfb_depth != 16 && legacyfb_depth != 32) {
+		pr_warn("i.MX legacyfb: invalid legacyfb_depth setting. defaulting to 16bpp\n");
+		legacyfb_depth = 16;
+	}
+
+	fbdev_cma = drm_fbdev_cma_init(drm, legacyfb_depth,
+			drm->mode_config.num_crtc, MAX_CONNECTOR);
+
+	if (IS_ERR(fbdev_cma)) {
+		imx_drm_device_put();
+		return PTR_ERR(fbdev_cma);
+	}
+
+	imx_drm_fb_helper_set(fbdev_cma);
+
+	return 0;
+}
+
+static void __exit imx_fb_helper_exit(void)
+{
+	imx_drm_fb_helper_set(NULL);
+	drm_fbdev_cma_fini(fbdev_cma);
+	imx_drm_device_put();
+}
+
+late_initcall(imx_fb_helper_init);
+module_exit(imx_fb_helper_exit);
+
+MODULE_DESCRIPTION("Freescale i.MX legacy fb driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");