omap2+: add drm device

Register OMAP DRM/KMS platform device, and reserve a CMA region for
the device to use for buffer allocation.  DMM is split into a
separate device using hwmod.

Signed-off-by: Andy Gross <andy.gross@ti.com>
Signed-off-by: Rob Clark <rob@ti.com>

arch/arm/mach-omap2/Makefile

@@ -189,6 +189,10 @@ ifneq ($(CONFIG_TIDSPBRIDGE),)
 obj-y					+= dsp.o
 endif
 
+ifneq ($(CONFIG_DRM_OMAP),)
+obj-y					+= drm.o
+endif
+
 # Specific board support
 obj-$(CONFIG_MACH_OMAP_GENERIC)		+= board-generic.o
 obj-$(CONFIG_MACH_OMAP_H4)		+= board-h4.o

arch/arm/mach-omap2/drm.c

@@ -0,0 +1,83 @@
+/*
+ * DRM/KMS device registration for TI OMAP platforms
+ *
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <rob.clark@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#ifdef CONFIG_CMA
+#  include <linux/dma-contiguous.h>
+#endif
+
+#include <plat/omap_device.h>
+#include <plat/omap_hwmod.h>
+
+#include <plat/drm.h>
+
+#if defined(CONFIG_DRM_OMAP) || (CONFIG_DRM_OMAP_MODULE)
+
+static struct omap_drm_platform_data omapdrm_platdata;
+
+static struct platform_device omap_drm_device = {
+		.dev = {
+			.coherent_dma_mask = DMA_BIT_MASK(32),
+			.platform_data = &omapdrm_platdata,
+		},
+		.name = "omapdrm",
+		.id = 0,
+};
+
+static int __init omap_init_drm(void)
+{
+	struct omap_hwmod *oh = NULL;
+	struct platform_device *pdev;
+
+	/* lookup and populate the DMM information, if present - OMAP4+ */
+	oh = omap_hwmod_lookup("dmm");
+
+	if (oh) {
+		pdev = omap_device_build(oh->name, -1, oh, NULL, 0, NULL, 0,
+					false);
+		WARN(IS_ERR(pdev), "Could not build omap_device for %s\n",
+			oh->name);
+	}
+
+	return platform_device_register(&omap_drm_device);
+
+}
+
+arch_initcall(omap_init_drm);
+
+void omapdrm_reserve_vram(void)
+{
+#ifdef CONFIG_CMA
+	/*
+	 * Create private 32MiB contiguous memory area for omapdrm.0 device
+	 * TODO revisit size.. if uc/wc buffers are allocated from CMA pages
+	 * then the amount of memory we need goes up..
+	 */
+	dma_declare_contiguous(&omap_drm_device.dev, 32 * SZ_1M, 0, 0);
+#else
+#  warning "CMA is not enabled, there may be limitations about scanout buffer allocations on OMAP3 and earlier"
+#endif
+}
+
+#endif

arch/arm/plat-omap/common.c

@@ -21,10 +21,10 @@
 #include <plat/board.h>
 #include <plat/vram.h>
 #include <plat/dsp.h>
+#include <plat/drm.h>
 
 #include <plat/omap-secure.h>
 
-
 #define NO_LENGTH_CHECK 0xffffffff
 
 struct omap_board_config_kernel *omap_board_config __initdata;
@@ -65,6 +65,7 @@ const void *__init omap_get_var_config(u16 tag, size_t *len)
 
 void __init omap_reserve(void)
 {
+	omapdrm_reserve_vram();
 	omapfb_reserve_sdram_memblock();
 	omap_vram_reserve_sdram_memblock();
 	omap_dsp_reserve_sdram_memblock();

arch/arm/plat-omap/include/plat/drm.h

@@ -0,0 +1,64 @@
+/*
+ * DRM/KMS device registration for TI OMAP platforms
+ *
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <rob.clark@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PLAT_OMAP_DRM_H__
+#define __PLAT_OMAP_DRM_H__
+
+/*
+ * Optional platform data to configure the default configuration of which
+ * pipes/overlays/CRTCs are used.. if this is not provided, then instead the
+ * first CONFIG_DRM_OMAP_NUM_CRTCS are used, and they are each connected to
+ * one manager, with priority given to managers that are connected to
+ * detected devices.  Remaining overlays are used as video planes.  This
+ * should be a good default behavior for most cases, but yet there still
+ * might be times when you wish to do something different.
+ */
+struct omap_kms_platform_data {
+	/* overlays to use as CRTCs: */
+	int ovl_cnt;
+	const int *ovl_ids;
+
+	/* overlays to use as video planes: */
+	int pln_cnt;
+	const int *pln_ids;
+
+	int mgr_cnt;
+	const int *mgr_ids;
+
+	int dev_cnt;
+	const char **dev_names;
+};
+
+struct omap_drm_platform_data {
+	struct omap_kms_platform_data *kms_pdata;
+};
+
+#if defined(CONFIG_DRM_OMAP) || defined(CONFIG_DRM_OMAP_MODULE)
+
+void omapdrm_reserve_vram(void);
+
+#else
+
+static inline void omapdrm_reserve_vram(void)
+{
+}
+
+#endif
+
+#endif /* __PLAT_OMAP_DRM_H__ */