@@ -0,0 +1,748 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+
+#define DRIVER_NAME "ofdrm"
+#define DRIVER_DESC "DRM driver for OF platform devices"
+#define DRIVER_DATE "20220501"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+/*
+ * Assume a monitor resolution of 96 dpi to
+ * get a somewhat reasonable screen size.
+ */
+#define RES_MM(d) \
+ (((d) * 254ul) / (96ul * 10ul))
+
+#define OFDRM_MODE(hd, vd) \
+ DRM_SIMPLE_MODE(hd, vd, RES_MM(hd), RES_MM(vd))
+
+/*
+ * Helpers for display nodes
+ */
+
+static int display_get_validated_int(struct drm_device *dev, const char *name, uint32_t value)
+{
+ if (value > INT_MAX) {
+ drm_err(dev, "invalid framebuffer %s of %u\n", name, value);
+ return -EINVAL;
+ }
+ return (int)value;
+}
+
+static int display_get_validated_int0(struct drm_device *dev, const char *name, uint32_t value)
+{
+ if (!value) {
+ drm_err(dev, "invalid framebuffer %s of %u\n", name, value);
+ return -EINVAL;
+ }
+ return display_get_validated_int(dev, name, value);
+}
+
+static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
+ u32 depth)
+{
+ const struct drm_format_info *info;
+ u32 format;
+
+ switch (depth) {
+ case 8:
+ format = drm_mode_legacy_fb_format(8, 8);
+ break;
+ case 15:
+ case 16:
+ format = drm_mode_legacy_fb_format(16, depth);
+ break;
+ case 32:
+ format = drm_mode_legacy_fb_format(32, 24);
+ break;
+ default:
+ drm_err(dev, "unsupported framebuffer depth %u\n", depth);
+ return ERR_PTR(-EINVAL);
+ }
+
+ info = drm_format_info(format);
+ if (!info) {
+ drm_err(dev, "cannot find framebuffer format for depth %u\n", depth);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return info;
+}
+
+static int display_read_u32_of(struct drm_device *dev, struct device_node *of_node,
+ const char *name, u32 *value)
+{
+ int ret = of_property_read_u32(of_node, name, value);
+
+ if (ret)
+ drm_err(dev, "cannot parse framebuffer %s: error %d\n", name, ret);
+ return ret;
+}
+
+static int display_get_width_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 width;
+ int ret = display_read_u32_of(dev, of_node, "width", &width);
+
+ if (ret)
+ return ret;
+ return display_get_validated_int0(dev, "width", width);
+}
+
+static int display_get_height_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 height;
+ int ret = display_read_u32_of(dev, of_node, "height", &height);
+
+ if (ret)
+ return ret;
+ return display_get_validated_int0(dev, "height", height);
+}
+
+static int display_get_linebytes_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 linebytes;
+ int ret = display_read_u32_of(dev, of_node, "linebytes", &linebytes);
+
+ if (ret)
+ return ret;
+ return display_get_validated_int(dev, "linebytes", linebytes);
+}
+
+static const struct drm_format_info *display_get_format_of(struct drm_device *dev,
+ struct device_node *of_node)
+{
+ u32 depth;
+ int ret = display_read_u32_of(dev, of_node, "depth", &depth);
+
+ if (ret)
+ return ERR_PTR(ret);
+ return display_get_validated_format(dev, depth);
+}
+
+static u64 display_get_address_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 address;
+ int ret;
+
+ /*
+ * Not all devices provide an address property, it's not
+ * a bug if this fails. The driver will try to find the
+ * framebuffer base address from the device's memory regions.
+ */
+ ret = of_property_read_u32(of_node, "address", &address);
+ if (ret)
+ return OF_BAD_ADDR;
+
+ return address;
+}
+
+#if defined(CONFIG_PCI)
+static struct pci_dev *display_get_pci_dev_of(struct drm_device *dev, struct device_node *of_node)
+{
+ const __be32 *vendor_p, *device_p;
+ u32 vendor, device;
+ struct pci_dev *pcidev;
+
+ vendor_p = of_get_property(of_node, "vendor-id", NULL);
+ if (!vendor_p)
+ return ERR_PTR(-ENODEV);
+ vendor = be32_to_cpup(vendor_p);
+
+ device_p = of_get_property(of_node, "device-id", NULL);
+ if (!device_p)
+ return ERR_PTR(-ENODEV);
+ device = be32_to_cpup(device_p);
+
+ pcidev = pci_get_device(vendor, device, NULL);
+ if (!pcidev)
+ return ERR_PTR(-ENODEV);
+
+ return pcidev;
+}
+#else
+static struct pci_dev *display_get_pci_dev_of(struct drm_device *dev, struct device_node *of_node)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
+/*
+ * Open Firmware display device
+ */
+
+struct ofdrm_device {
+ struct drm_device dev;
+ struct platform_device *pdev;
+
+ /* OF display settings */
+ struct drm_display_mode mode;
+ const struct drm_format_info *format;
+ unsigned int pitch;
+ resource_size_t fb_base;
+ resource_size_t fb_size;
+
+ /* memory management */
+ struct resource *mem;
+ void __iomem *screen_base;
+
+ /* modesetting */
+ uint32_t formats[8];
+ size_t nformats;
+ struct drm_connector connector;
+ struct drm_simple_display_pipe pipe;
+};
+
+static struct ofdrm_device *ofdrm_device_of_dev(struct drm_device *dev)
+{
+ return container_of(dev, struct ofdrm_device, dev);
+}
+
+/*
+ * OF display settings
+ */
+
+static void ofdrm_pci_release(void *data)
+{
+ struct pci_dev *pcidev = data;
+
+ pci_disable_device(pcidev);
+}
+
+static struct drm_display_mode ofdrm_mode(unsigned int width, unsigned int height)
+{
+ struct drm_display_mode mode = { OFDRM_MODE(width, height) };
+
+ mode.clock = mode.hdisplay * mode.vdisplay * 60 / 1000 /* kHz */;
+ drm_mode_set_name(&mode);
+
+ return mode;
+}
+
+static struct resource *ofdrm_find_fb_resource(struct ofdrm_device *odev,
+ struct resource *fb_res)
+{
+ struct platform_device *pdev = to_platform_device(odev->dev.dev);
+ struct resource *res, *max_res = NULL;
+ u32 i;
+
+ for (i = 0; pdev->num_resources; ++i) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ break; /* all resources processed */
+ if (resource_size(res) < resource_size(fb_res))
+ continue; /* resource too small */
+ if (fb_res->start && resource_contains(res, fb_res))
+ return res; /* resource contains framebuffer */
+ if (!max_res || resource_size(res) > resource_size(max_res))
+ max_res = res; /* store largest resource as fallback */
+ }
+
+ return max_res;
+}
+
+static int ofdrm_device_init_fb(struct ofdrm_device *odev)
+{
+ struct drm_device *dev = &odev->dev;
+ struct platform_device *pdev = odev->pdev;
+ struct device_node *of_node = pdev->dev.of_node;
+ int width, height, linebytes;
+ u64 address;
+ const struct drm_format_info *format;
+ struct pci_dev *pcidev;
+ struct resource *res;
+ int ret;
+
+ width = display_get_width_of(dev, of_node);
+ if (width < 0)
+ return width;
+ height = display_get_height_of(dev, of_node);
+ if (height < 0)
+ return height;
+ linebytes = display_get_linebytes_of(dev, of_node);
+ if (linebytes < 0)
+ return linebytes;
+ format = display_get_format_of(dev, of_node);
+ if (IS_ERR(format))
+ return PTR_ERR(format);
+ address = display_get_address_of(dev, of_node);
+
+ /*
+ * Never use pcim_ or other managed helpers on the returned PCI
+ * device. Otherwise, probing the native driver will fail for
+ * resource conflicts. PCI-device management has to be tied to
+ * the lifetime of the platform device until the native driver
+ * takes over.
+ */
+ pcidev = display_get_pci_dev_of(dev, of_node);
+ if (!IS_ERR(pcidev)) {
+ ret = pci_enable_device(pcidev);
+ if (drm_WARN(dev, ret, "pci_enable_device(%s) failed: %d\n",
+ dev_name(&pcidev->dev), ret))
+ return ret;
+ ret = devm_add_action_or_reset(&pdev->dev, ofdrm_pci_release, pcidev);
+ if (ret)
+ return ret;
+ }
+
+ odev->mode = ofdrm_mode(width, height);
+ odev->format = format;
+
+ if (linebytes)
+ odev->pitch = linebytes;
+ else
+ odev->pitch = width * format->cpp[0];
+
+ odev->fb_size = odev->pitch * height;
+
+ /*
+ * Try to figure out the address of the framebuffer. Unfortunately, Open
+ * Firmware doesn't provide a standard way to do so. All we can do is a
+ * dodgy heuristic that happens to work in practice.
+ *
+ * On most machines, the "address" property contains what we need, though
+ * not on Matrox cards found in IBM machines. What appears to give good
+ * results is to go through the PCI ranges and pick one that encloses the
+ * "address" property. If none match, we pick the largest.
+ */
+ if (address != OF_BAD_ADDR) {
+ struct resource fb_res = DEFINE_RES_MEM(address, odev->fb_size);
+
+ res = ofdrm_find_fb_resource(odev, &fb_res);
+ if (!res)
+ return -EINVAL;
+ if (resource_contains(res, &fb_res))
+ odev->fb_base = address;
+ else
+ odev->fb_base = res->start;
+ } else {
+ struct resource fb_res = DEFINE_RES_MEM(0u, odev->fb_size);
+
+ res = ofdrm_find_fb_resource(odev, &fb_res);
+ if (!res)
+ return -EINVAL;
+ odev->fb_base = res->start;
+ }
+
+ drm_dbg(dev, "display mode={" DRM_MODE_FMT "}\n", DRM_MODE_ARG(&odev->mode));
+ drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, linebytes=%d byte, address=0x%llx\n",
+ &format->format, width, height, linebytes, address);
+
+ return 0;
+}
+
+/*
+ * Memory management
+ */
+
+static int ofdrm_device_init_mm(struct ofdrm_device *odev)
+{
+ struct drm_device *dev = &odev->dev;
+ struct platform_device *pdev = odev->pdev;
+ struct resource res = DEFINE_RES_MEM(odev->fb_base, round_up(odev->fb_size, PAGE_SIZE));
+ struct resource *mem;
+ void __iomem *screen_base;
+ int ret;
+
+ ret = devm_aperture_acquire_from_firmware(dev, res.start, resource_size(&res));
+ if (ret) {
+ drm_err(dev, "could not acquire memory range %pr: error %d\n", &res, ret);
+ return ret;
+ }
+
+ mem = devm_request_mem_region(&pdev->dev, res.start, resource_size(&res),
+ odev->dev.driver->name);
+ if (!mem) {
+ drm_warn(dev, "could not acquire memory region %pr\n", &res);
+ return -ENOMEM;
+ }
+
+ drm_dbg(dev, "mapping framebuffer: %pr\n", mem);
+
+ screen_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+ if (drm_WARN_ON(dev, !screen_base))
+ return -ENOMEM;
+
+ odev->mem = mem;
+ odev->screen_base = screen_base;
+
+ drm_dbg(dev, "framebuffer at %pr, mapped at 0x%p\n", mem, screen_base);
+
+ return 0;
+}
+
+/*
+ * Modesetting
+ */
+
+/*
+ * Support all formats of OF display and maybe more; in order
+ * of preference. The display's update function will do any
+ * conversion necessary.
+ *
+ * TODO: Add blit helpers for remaining formats and uncomment
+ * constants.
+ */
+static const uint32_t ofdrm_default_formats[] = {
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_RGB565,
+ //DRM_FORMAT_XRGB1555,
+ DRM_FORMAT_C8,
+};
+
+static const uint64_t ofdrm_format_modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID
+};
+
+static int ofdrm_connector_helper_get_modes(struct drm_connector *connector)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(connector->dev);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, &odev->mode);
+ if (!mode)
+ return 0;
+
+ if (mode->name[0] == '\0')
+ drm_mode_set_name(mode);
+
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+
+ if (mode->width_mm)
+ connector->display_info.width_mm = mode->width_mm;
+ if (mode->height_mm)
+ connector->display_info.height_mm = mode->height_mm;
+
+ return 1;
+}
+
+static const struct drm_connector_helper_funcs ofdrm_connector_helper_funcs = {
+ .get_modes = ofdrm_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs ofdrm_connector_funcs = {
+ .reset = drm_atomic_helper_connector_reset,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int ofdrm_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
+ const struct drm_display_mode *mode)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(pipe->crtc.dev);
+
+ if (mode->hdisplay != odev->mode.hdisplay &&
+ mode->vdisplay != odev->mode.vdisplay)
+ return MODE_ONE_SIZE;
+ else if (mode->hdisplay != odev->mode.hdisplay)
+ return MODE_ONE_WIDTH;
+ else if (mode->vdisplay != odev->mode.vdisplay)
+ return MODE_ONE_HEIGHT;
+
+ return MODE_OK;
+}
+
+static void ofdrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(pipe->crtc.dev);
+ struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+ struct drm_framebuffer *fb = plane_state->fb;
+ void *vmap = shadow_plane_state->data[0].vaddr; /* TODO: Use mapping abstraction */
+ struct drm_device *dev = &odev->dev;
+ void __iomem *dst = odev->screen_base;
+ struct drm_rect src_clip, dst_clip;
+ int idx;
+
+ if (!fb)
+ return;
+
+ drm_rect_fp_to_int(&src_clip, &plane_state->src);
+
+ dst_clip = plane_state->dst;
+ if (!drm_rect_intersect(&dst_clip, &src_clip))
+ return;
+
+ if (!drm_dev_enter(dev, &idx))
+ return;
+
+ dst += drm_fb_clip_offset(odev->pitch, odev->format, &dst_clip);
+ drm_fb_blit_toio(dst, odev->pitch, odev->format->format, vmap, fb, &src_clip);
+
+ drm_dev_exit(idx);
+}
+
+static void ofdrm_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(pipe->crtc.dev);
+ struct drm_device *dev = &odev->dev;
+ int idx;
+
+ if (!drm_dev_enter(dev, &idx))
+ return;
+
+ /* Clear screen to black if disabled */
+ memset_io(odev->screen_base, 0, odev->pitch * odev->mode.vdisplay);
+
+ drm_dev_exit(idx);
+}
+
+static void ofdrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *old_plane_state)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(pipe->crtc.dev);
+ struct drm_plane_state *plane_state = pipe->plane.state;
+ struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+ void *vmap = shadow_plane_state->data[0].vaddr; /* TODO: Use mapping abstraction */
+ struct drm_framebuffer *fb = plane_state->fb;
+ struct drm_device *dev = &odev->dev;
+ struct drm_atomic_helper_damage_iter damage_iter;
+ struct drm_rect src_clip, dst_clip;
+ void __iomem *dst;
+ int idx;
+
+ if (!fb)
+ return;
+
+ if (!drm_dev_enter(dev, &idx))
+ return;
+
+ drm_atomic_helper_damage_iter_init(&damage_iter, old_plane_state, plane_state);
+ drm_atomic_for_each_plane_damage(&damage_iter, &src_clip) {
+
+ dst_clip = plane_state->dst;
+ if (!drm_rect_intersect(&dst_clip, &src_clip))
+ continue;
+
+ dst = odev->screen_base;
+ dst += drm_fb_clip_offset(odev->pitch, odev->format, &dst_clip);
+ drm_fb_blit_toio(dst, odev->pitch, odev->format->format, vmap, fb, &src_clip);
+ }
+
+ drm_dev_exit(idx);
+}
+
+static const struct drm_simple_display_pipe_funcs ofdrm_simple_display_pipe_funcs = {
+ .mode_valid = ofdrm_simple_display_pipe_mode_valid,
+ .enable = ofdrm_simple_display_pipe_enable,
+ .disable = ofdrm_simple_display_pipe_disable,
+ .update = ofdrm_simple_display_pipe_update,
+ DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
+};
+
+static const struct drm_mode_config_funcs ofdrm_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static const uint32_t *ofdrm_device_formats(struct ofdrm_device *odev, size_t *nformats_out)
+{
+ struct drm_device *dev = &odev->dev;
+ size_t i;
+
+ if (odev->nformats)
+ goto out; /* don't rebuild list on recurring calls */
+
+ /* native format goes first */
+ odev->formats[0] = odev->format->format;
+ odev->nformats = 1;
+
+ /* default formats go second */
+ for (i = 0; i < ARRAY_SIZE(ofdrm_default_formats); ++i) {
+ if (ofdrm_default_formats[i] == odev->format->format)
+ continue; /* native format already went first */
+ odev->formats[odev->nformats] = ofdrm_default_formats[i];
+ odev->nformats++;
+ }
+
+ /*
+ * TODO: The ofdrm driver converts framebuffers to the native
+ * format when copying them to device memory. If there are more
+ * formats listed than supported by the driver, the native format
+ * is not supported by the conversion helpers. Therefore *only*
+ * support the native format and add a conversion helper ASAP.
+ */
+ if (drm_WARN_ONCE(dev, i != odev->nformats,
+ "format conversion helpers required for %p4cc",
+ &odev->format->format)) {
+ odev->nformats = 1;
+ }
+
+out:
+ *nformats_out = odev->nformats;
+ return odev->formats;
+}
+
+static int ofdrm_device_init_modeset(struct ofdrm_device *odev)
+{
+ struct drm_device *dev = &odev->dev;
+ struct drm_display_mode *mode = &odev->mode;
+ struct drm_connector *connector = &odev->connector;
+ struct drm_simple_display_pipe *pipe = &odev->pipe;
+ unsigned long max_width, max_height;
+ const uint32_t *formats;
+ size_t nformats;
+ int ret;
+
+ ret = drmm_mode_config_init(dev);
+ if (ret)
+ return ret;
+
+ max_width = max_t(unsigned long, mode->hdisplay, DRM_SHADOW_PLANE_MAX_WIDTH);
+ max_height = max_t(unsigned long, mode->vdisplay, DRM_SHADOW_PLANE_MAX_HEIGHT);
+
+ dev->mode_config.min_width = mode->hdisplay;
+ dev->mode_config.max_width = max_width;
+ dev->mode_config.min_height = mode->vdisplay;
+ dev->mode_config.max_height = max_height;
+ dev->mode_config.preferred_depth = odev->format->cpp[0] * 8;
+ dev->mode_config.funcs = &ofdrm_mode_config_funcs;
+
+ ret = drm_connector_init(dev, connector, &ofdrm_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret)
+ return ret;
+ drm_connector_helper_add(connector, &ofdrm_connector_helper_funcs);
+ drm_connector_set_panel_orientation_with_quirk(connector,
+ DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
+ mode->hdisplay, mode->vdisplay);
+
+ formats = ofdrm_device_formats(odev, &nformats);
+
+ ret = drm_simple_display_pipe_init(dev, pipe, &ofdrm_simple_display_pipe_funcs,
+ formats, nformats, ofdrm_format_modifiers,
+ connector);
+ if (ret)
+ return ret;
+
+ drm_plane_enable_fb_damage_clips(&pipe->plane);
+
+ drm_mode_config_reset(dev);
+
+ return 0;
+}
+
+/*
+ * Init / Cleanup
+ */
+
+static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
+ struct platform_device *pdev)
+{
+ struct ofdrm_device *odev;
+ int ret;
+
+ odev = devm_drm_dev_alloc(&pdev->dev, drv, struct ofdrm_device, dev);
+ if (IS_ERR(odev))
+ return ERR_CAST(odev);
+ odev->pdev = pdev;
+ platform_set_drvdata(pdev, &odev->dev);
+
+ ret = ofdrm_device_init_fb(odev);
+ if (ret)
+ return ERR_PTR(ret);
+ ret = ofdrm_device_init_mm(odev);
+ if (ret)
+ return ERR_PTR(ret);
+ ret = ofdrm_device_init_modeset(odev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return odev;
+}
+
+/*
+ * DRM driver
+ */
+
+DEFINE_DRM_GEM_FOPS(ofdrm_fops);
+
+static struct drm_driver ofdrm_driver = {
+ DRM_GEM_SHMEM_DRIVER_OPS,
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+ .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
+ .fops = &ofdrm_fops,
+};
+
+/*
+ * Platform driver
+ */
+
+static int ofdrm_probe(struct platform_device *pdev)
+{
+ struct ofdrm_device *odev;
+ struct drm_device *dev;
+ int ret;
+
+ odev = ofdrm_device_create(&ofdrm_driver, pdev);
+ if (IS_ERR(odev))
+ return PTR_ERR(odev);
+ dev = &odev->dev;
+
+ ret = drm_dev_register(dev, 0);
+ if (ret)
+ return ret;
+
+ drm_fbdev_generic_setup(dev, 0);
+
+ return 0;
+}
+
+static int ofdrm_remove(struct platform_device *pdev)
+{
+ struct drm_device *dev = platform_get_drvdata(pdev);
+
+ drm_dev_unplug(dev);
+
+ return 0;
+}
+
+static const struct of_device_id ofdrm_of_match_display[] = {
+ { .compatible = "display", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ofdrm_of_match_display);
+
+static struct platform_driver ofdrm_platform_driver = {
+ .driver = {
+ .name = "of-display",
+ .of_match_table = ofdrm_of_match_display,
+ },
+ .probe = ofdrm_probe,
+ .remove = ofdrm_remove,
+};
+
+module_platform_driver(ofdrm_platform_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");