This commit adds an initial framework that can be used to plug SoC
graphics devices into the DRM/KMS subsystem.
SoCs often don't have a dedicated device to which a DRM driver can bind,
but instead the graphics complex typically consists of several platform-
type devices that work together. The DRM SoC support code therefore adds
a dummy device that is associated with the DRM driver, which typically
provides some kind of API for other drivers to register with.
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/Kconfig | 4 ++
drivers/gpu/drm/Makefile | 2 +
drivers/gpu/drm/drm_soc.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++
include/drm/drmP.h | 5 ++
4 files changed, 162 insertions(+)
create mode 100644 drivers/gpu/drm/drm_soc.c
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 23120c0..529dede 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -24,6 +24,10 @@ config DRM_USB
depends on DRM
select USB
+config DRM_SOC
+ tristate
+ depends on DRM
+
config DRM_KMS_HELPER
tristate
depends on DRM
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index f65f65e..4731cbc 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -17,6 +17,7 @@ drm-y := drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
drm-$(CONFIG_COMPAT) += drm_ioc32.o
drm-usb-y := drm_usb.o
+drm-soc-y := drm_soc.o
drm_kms_helper-y := drm_fb_helper.o drm_crtc_helper.o drm_dp_i2c_helper.o
drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
@@ -27,6 +28,7 @@ CFLAGS_drm_trace_points.o := -I$(src)
obj-$(CONFIG_DRM) += drm.o
obj-$(CONFIG_DRM_USB) += drm_usb.o
+obj-$(CONFIG_DRM_SOC) += drm-soc.o
obj-$(CONFIG_DRM_TTM) += ttm/
obj-$(CONFIG_DRM_TDFX) += tdfx/
obj-$(CONFIG_DRM_R128) += r128/
diff --git a/drivers/gpu/drm/drm_soc.c b/drivers/gpu/drm/drm_soc.c
new file mode 100644
index 0000000..bc120ae
--- /dev/null
+++ b/drivers/gpu/drm/drm_soc.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2012 Avionic Design GmbH
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <drm/drmP.h>
+#include <drm/drm_sysfs.h>
+
+static const char *drm_soc_get_name(struct drm_device *dev)
+{
+ DRM_DEBUG("\n");
+ return dev_name(dev->dev);
+}
+
+static int drm_soc_set_busid(struct drm_device *dev, struct drm_master *master)
+{
+ DRM_DEBUG("\n");
+ return -ENOSYS;
+}
+
+static int drm_soc_set_unique(struct drm_device *dev, struct drm_master *master,
+ struct drm_unique *unique)
+{
+ DRM_DEBUG("\n");
+ return -ENOSYS;
+}
+
+static struct drm_bus drm_soc_bus = {
+ .bus_type = DRIVER_BUS_SOC,
+ .get_name = drm_soc_get_name,
+ .set_busid = drm_soc_set_busid,
+ .set_unique = drm_soc_set_unique,
+};
+
+static struct device_type drm_soc_device_type = {
+ .name = "soc",
+};
+
+static void drm_soc_device_release(struct device *dev)
+{
+ kfree(dev);
+}
+
+static struct device *drm_create_soc_device(const char *name)
+{
+ struct device *dev;
+ int err;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+
+ dev->release = drm_soc_device_release;
+ dev->type = &drm_soc_device_type;
+ dev_set_name(dev, name);
+
+ err = drm_class_device_register(dev);
+ if (err < 0)
+ goto put;
+
+ return dev;
+
+put:
+ put_device(dev);
+ return NULL;
+}
+
+int drm_soc_init(struct drm_driver *driver, const char *name)
+{
+ struct drm_device *dev;
+ int ret;
+
+ INIT_LIST_HEAD(&driver->device_list);
+ driver->bus = &drm_soc_bus;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->dev = drm_create_soc_device(name);
+ if (!dev->dev) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ ret = drm_fill_in_dev(dev, NULL, driver);
+ if (ret < 0)
+ goto unregister;
+
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
+ if (ret < 0)
+ goto unregister;
+ }
+
+ ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
+ if (ret < 0)
+ goto put_control;
+
+ if (dev->driver->load) {
+ ret = dev->driver->load(dev, 0);
+ if (ret < 0)
+ goto put_legacy;
+ }
+
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
+ if (ret < 0)
+ goto put_legacy;
+ }
+
+ list_add_tail(&dev->driver_item, &driver->device_list);
+
+ DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
+ driver->major, driver->minor, driver->patchlevel,
+ driver->date, dev->primary->index);
+
+ return 0;
+
+put_legacy:
+ drm_put_minor(&dev->primary);
+put_control:
+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ drm_put_minor(&dev->control);
+unregister:
+ drm_class_device_unregister(dev->dev);
+free:
+ kfree(dev);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(drm_soc_init);
+
+void drm_soc_exit(struct drm_driver *driver)
+{
+ struct drm_device *drm, *tmp;
+
+ list_for_each_entry_safe(drm, tmp, &driver->device_list, driver_item) {
+ struct device *dev = drm->dev;
+ drm_put_dev(drm);
+ drm_class_device_unregister(dev);
+ }
+}
+EXPORT_SYMBOL_GPL(drm_soc_exit);
+
+MODULE_AUTHOR("Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("SoC DRM support");
+MODULE_LICENSE("GPL");
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 31ad880..bc1edd1 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -156,6 +156,7 @@ int drm_err(const char *func, const char *format, ...);
#define DRIVER_BUS_PCI 0x1
#define DRIVER_BUS_PLATFORM 0x2
#define DRIVER_BUS_USB 0x3
+#define DRIVER_BUS_SOC 0x4
/***********************************************************************/
/** \name Begin the DRM... */
@@ -1769,6 +1770,10 @@ extern void drm_platform_exit(struct drm_driver *driver, struct platform_device
extern int drm_get_platform_dev(struct platform_device *pdev,
struct drm_driver *driver);
+/* SoC section */
+extern int drm_soc_init(struct drm_driver *driver, const char *name);
+extern void drm_soc_exit(struct drm_driver *driver);
+
/* returns true if currently okay to sleep */
static __inline__ bool drm_can_sleep(void)
{
--
1.7.11.1
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