[PATCH] omap2+: add drm device

Rob Clark
2012-03-05T16:54:30Z

From: Andy Gross <andy.gross@ti.com>

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/plat-omap/Makefile | 2 +-
arch/arm/plat-omap/common.c | 3 +-
arch/arm/plat-omap/drm.c | 83 +++++++++++++++++++++++++++++++++
arch/arm/plat-omap/include/plat/drm.h | 64 +++++++++++++++++++++++++
4 files changed, 150 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/plat-omap/drm.c
create mode 100644 arch/arm/plat-omap/include/plat/drm.h

diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile
index 9a58461..b86e6cb 100644
--- a/arch/arm/plat-omap/Makefile
+++ b/arch/arm/plat-omap/Makefile
@@ -4,7 +4,7 @@

# Common support
obj-y := common.o sram.o clock.o devices.o dma.o mux.o \
- usb.o fb.o counter_32k.o
+ usb.o fb.o counter_32k.o drm.o
obj-m :=
obj-n :=
obj- :=
diff --git a/arch/arm/plat-omap/common.c b/arch/arm/plat-omap/common.c
index 06383b5..0d87dab 100644
--- a/arch/arm/plat-omap/common.c
+++ b/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();
diff --git a/arch/arm/plat-omap/drm.c b/arch/arm/plat-omap/drm.c
new file mode 100644
index 0000000..28279df
--- /dev/null
+++ b/arch/arm/plat-omap/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_gpu(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_gpu);
+
+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
diff --git a/arch/arm/plat-omap/include/plat/drm.h b/arch/arm/plat-omap/include/plat/drm.h
new file mode 100644
index 0000000..df9bc41
--- /dev/null
+++ b/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__ */
--
1.7.5.4