@@ -57,4 +57,20 @@ config DRM_SIMPLEDRM
On x86 BIOS or UEFI systems, you should also select SYSFB_SIMPLEFB
to use UEFI and VESA framebuffers.
+config DRM_VESADRM
+ tristate "VESA framebuffer driver"
+ depends on DRM && MMU && (!SYSFB_SIMPLEFB || COMPILE_TEST)
+ select APERTURE_HELPERS
+ select DRM_CLIENT_SELECTION
+ select DRM_GEM_SHMEM_HELPER
+ select DRM_KMS_HELPER
+ select DRM_SYSFB_HELPER
+ select SYSFB
+ help
+ DRM driver for VESA framebuffers.
+
+ This driver assumes that the display hardware has been initialized
+ by the firmware or bootloader before the kernel boots. Scanout
+ buffer, size, and display format must be provided via VBE interfaces.
+
endmenu
@@ -5,3 +5,4 @@ obj-$(CONFIG_DRM_SYSFB_HELPER) += drm_sysfb_helper.o
obj-$(CONFIG_DRM_EFIDRM) += efidrm.o
obj-$(CONFIG_DRM_OFDRM) += ofdrm.o
obj-$(CONFIG_DRM_SIMPLEDRM) += simpledrm.o
+obj-$(CONFIG_DRM_VESADRM) += vesadrm.o
new file mode 100644
@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/aperture.h>
+#include <linux/ioport.h>
+#include <linux/limits.h>
+#include <linux/platform_device.h>
+#include <linux/screen_info.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.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_fbdev_shmem.h>
+#include <drm/drm_framebuffer.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 <video/pixel_format.h>
+
+#include "drm_sysfb_helper.h"
+
+#define DRIVER_NAME "vesadrm"
+#define DRIVER_DESC "DRM driver for VESA platform devices"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+static int vesadrm_get_validated_int(struct drm_device *dev, const char *name,
+ u64 value, u32 max)
+{
+ if (max > INT_MAX)
+ max = INT_MAX;
+ if (value > max) {
+ drm_err(dev, "%s of %llu exceeds maximum of %u\n", name, value, max);
+ return -EINVAL;
+ }
+ return value;
+}
+
+static int vesadrm_get_validated_int0(struct drm_device *dev, const char *name,
+ u64 value, u32 max)
+{
+ if (!value) {
+ drm_err(dev, "%s of 0 not allowed\n", name);
+ return -EINVAL;
+ }
+ return vesadrm_get_validated_int(dev, name, value, max);
+}
+
+static s64 vesadrm_get_validated_size0(struct drm_device *dev, const char *name,
+ u64 value, u64 max)
+{
+ if (!value) {
+ drm_err(dev, "vesadrm: %s of 0 not allowed\n", name);
+ return -EINVAL;
+ } else if (value > max) {
+ drm_err(dev, "vesadrm: %s of %llu exceeds maximum of %llu\n", name, value, max);
+ return -EINVAL;
+ }
+ return value;
+}
+
+static int vesadrm_get_width_si(struct drm_device *dev, const struct screen_info *si)
+{
+ return vesadrm_get_validated_int0(dev, "width", si->lfb_width, U16_MAX);
+}
+
+static int vesadrm_get_height_si(struct drm_device *dev, const struct screen_info *si)
+{
+ return vesadrm_get_validated_int0(dev, "height", si->lfb_height, U16_MAX);
+}
+
+static struct resource *vesadrm_get_memory_si(struct drm_device *dev,
+ const struct screen_info *si,
+ struct resource *res)
+{
+ ssize_t num;
+
+ num = screen_info_resources(si, res, 1);
+ if (!num) {
+ drm_err(dev, "vesadrm: memory resource not found\n");
+ return NULL;
+ }
+
+ return res;
+}
+
+static int vesadrm_get_stride_si(struct drm_device *dev, const struct screen_info *si,
+ const struct drm_format_info *format,
+ unsigned int width, unsigned int height, u64 size)
+{
+ u64 lfb_linelength = si->lfb_linelength;
+
+ if (!lfb_linelength)
+ lfb_linelength = drm_format_info_min_pitch(format, 0, width);
+
+ return vesadrm_get_validated_int0(dev, "stride", lfb_linelength, div64_u64(size, height));
+}
+
+static u64 vesadrm_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
+ unsigned int height, unsigned int stride, u64 size)
+{
+ u64 vsize = PAGE_ALIGN(height * stride);
+
+ return vesadrm_get_validated_size0(dev, "visible size", vsize, size);
+}
+
+static const struct drm_format_info *vesadrm_get_format_si(struct drm_device *dev,
+ const struct screen_info *si)
+{
+ static const struct {
+ struct pixel_format pixel;
+ u32 fourcc;
+ } vesa_formats[] = {
+ { PIXEL_FORMAT_XRGB1555, DRM_FORMAT_XRGB1555, },
+ { PIXEL_FORMAT_RGB565, DRM_FORMAT_RGB565, },
+ { PIXEL_FORMAT_RGB888, DRM_FORMAT_RGB888, },
+ { PIXEL_FORMAT_XRGB8888, DRM_FORMAT_XRGB8888, },
+ { PIXEL_FORMAT_XBGR8888, DRM_FORMAT_XBGR8888, },
+ };
+ const struct drm_format_info *format = NULL;
+ u32 bits_per_pixel;
+ size_t i;
+
+ bits_per_pixel = __screen_info_lfb_bits_per_pixel(si);
+
+ for (i = 0; i < ARRAY_SIZE(vesa_formats); ++i) {
+ const struct pixel_format *f = &vesa_formats[i].pixel;
+
+ if (bits_per_pixel == f->bits_per_pixel &&
+ si->red_size == f->red.length &&
+ si->red_pos == f->red.offset &&
+ si->green_size == f->green.length &&
+ si->green_pos == f->green.offset &&
+ si->blue_size == f->blue.length &&
+ si->blue_pos == f->blue.offset) {
+ format = drm_format_info(vesa_formats[i].fourcc);
+ break;
+ }
+ }
+
+ if (!format)
+ return ERR_PTR(-EINVAL);
+ if (format->is_color_indexed)
+ return ERR_PTR(-EINVAL);
+
+ return format;
+}
+
+/*
+ * VESA device
+ */
+
+struct vesadrm_device {
+ struct drm_sysfb_device sysfb;
+
+ /* modesetting */
+ u32 formats[DRM_SYSFB_PLANE_NFORMATS(1)];
+ struct drm_plane primary_plane;
+ struct drm_crtc crtc;
+ struct drm_encoder encoder;
+ struct drm_connector connector;
+};
+
+/*
+ * Modesetting
+ */
+
+static const u64 vesadrm_primary_plane_format_modifiers[] = {
+ DRM_SYSFB_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs vesadrm_primary_plane_helper_funcs = {
+ DRM_SYSFB_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs vesadrm_primary_plane_funcs = {
+ DRM_SYSFB_PLANE_FUNCS,
+ .destroy = drm_plane_cleanup,
+};
+
+static const struct drm_crtc_helper_funcs vesadrm_crtc_helper_funcs = {
+ DRM_SYSFB_CRTC_HELPER_FUNCS,
+};
+
+static const struct drm_crtc_funcs vesadrm_crtc_funcs = {
+ DRM_SYSFB_CRTC_FUNCS,
+ .destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs vesadrm_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs vesadrm_connector_helper_funcs = {
+ DRM_SYSFB_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs vesadrm_connector_funcs = {
+ DRM_SYSFB_CONNECTOR_FUNCS,
+ .destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_funcs vesadrm_mode_config_funcs = {
+ DRM_SYSFB_MODE_CONFIG_FUNCS,
+};
+
+/*
+ * Init / Cleanup
+ */
+
+static struct vesadrm_device *vesadrm_device_create(struct drm_driver *drv,
+ struct platform_device *pdev)
+{
+ const struct screen_info *si;
+ const struct drm_format_info *format;
+ int width, height, stride;
+ u64 vsize;
+ struct resource resbuf;
+ struct resource *res;
+ struct vesadrm_device *vesa;
+ struct drm_sysfb_device *sysfb;
+ struct drm_device *dev;
+ struct resource *mem = NULL;
+ void __iomem *screen_base;
+ struct drm_plane *primary_plane;
+ struct drm_crtc *crtc;
+ struct drm_encoder *encoder;
+ struct drm_connector *connector;
+ unsigned long max_width, max_height;
+ size_t nformats;
+ int ret;
+
+ si = dev_get_platdata(&pdev->dev);
+ if (!si)
+ return ERR_PTR(-ENODEV);
+ if (screen_info_video_type(si) != VIDEO_TYPE_VLFB)
+ return ERR_PTR(-ENODEV);
+
+ /*
+ * VESA DRM driver
+ */
+
+ vesa = devm_drm_dev_alloc(&pdev->dev, drv, struct vesadrm_device, sysfb.dev);
+ if (IS_ERR(vesa))
+ return ERR_CAST(vesa);
+ sysfb = &vesa->sysfb;
+ dev = &sysfb->dev;
+ platform_set_drvdata(pdev, dev);
+
+ /*
+ * Hardware settings
+ */
+
+ format = vesadrm_get_format_si(dev, si);
+ if (IS_ERR(format))
+ return ERR_CAST(format);
+ width = vesadrm_get_width_si(dev, si);
+ if (width < 0)
+ return ERR_PTR(width);
+ height = vesadrm_get_height_si(dev, si);
+ if (height < 0)
+ return ERR_PTR(height);
+ res = vesadrm_get_memory_si(dev, si, &resbuf);
+ if (!res)
+ return ERR_PTR(-EINVAL);
+ stride = vesadrm_get_stride_si(dev, si, format, width, height, resource_size(res));
+ if (stride < 0)
+ return ERR_PTR(stride);
+ vsize = vesadrm_get_visible_size_si(dev, si, height, stride, resource_size(res));
+ if (!vsize)
+ return ERR_PTR(-EINVAL);
+
+ drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, stride=%d bytes\n",
+ &format->format, width, height, stride);
+
+ sysfb->fb_mode = drm_sysfb_mode(width, height, 0, 0);
+ sysfb->fb_format = format;
+ sysfb->fb_pitch = stride;
+
+ /*
+ * Memory management
+ */
+
+ ret = devm_aperture_acquire_for_platform_device(pdev, res->start, vsize);
+ if (ret) {
+ drm_err(dev, "could not acquire memory range %pr: %d\n", res, ret);
+ return ERR_PTR(ret);
+ }
+
+ drm_dbg(dev, "using I/O memory framebuffer at %pr\n", res);
+
+ mem = devm_request_mem_region(&pdev->dev, res->start, vsize, drv->name);
+ if (!mem) {
+ /*
+ * We cannot make this fatal. Sometimes this comes from magic
+ * spaces our resource handlers simply don't know about. Use
+ * the I/O-memory resource as-is and try to map that instead.
+ */
+ drm_warn(dev, "could not acquire memory region %pr\n", res);
+ mem = res;
+ }
+
+ screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem));
+ if (!screen_base)
+ return ERR_PTR(-ENOMEM);
+ iosys_map_set_vaddr_iomem(&sysfb->fb_addr, screen_base);
+
+ /*
+ * Modesetting
+ */
+
+ ret = drmm_mode_config_init(dev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH);
+ max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT);
+
+ dev->mode_config.min_width = width;
+ dev->mode_config.max_width = max_width;
+ dev->mode_config.min_height = height;
+ dev->mode_config.max_height = max_height;
+ dev->mode_config.preferred_depth = format->depth;
+ dev->mode_config.funcs = &vesadrm_mode_config_funcs;
+
+ /* Primary plane */
+
+ nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
+ vesa->formats, ARRAY_SIZE(vesa->formats));
+
+ primary_plane = &vesa->primary_plane;
+ ret = drm_universal_plane_init(dev, primary_plane, 0, &vesadrm_primary_plane_funcs,
+ vesa->formats, nformats,
+ vesadrm_primary_plane_format_modifiers,
+ DRM_PLANE_TYPE_PRIMARY, NULL);
+ if (ret)
+ return ERR_PTR(ret);
+ drm_plane_helper_add(primary_plane, &vesadrm_primary_plane_helper_funcs);
+ drm_plane_enable_fb_damage_clips(primary_plane);
+
+ /* CRTC */
+
+ crtc = &vesa->crtc;
+ ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+ &vesadrm_crtc_funcs, NULL);
+ if (ret)
+ return ERR_PTR(ret);
+ drm_crtc_helper_add(crtc, &vesadrm_crtc_helper_funcs);
+
+ /* Encoder */
+
+ encoder = &vesa->encoder;
+ ret = drm_encoder_init(dev, encoder, &vesadrm_encoder_funcs,
+ DRM_MODE_ENCODER_NONE, NULL);
+ if (ret)
+ return ERR_PTR(ret);
+ encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+ /* Connector */
+
+ connector = &vesa->connector;
+ ret = drm_connector_init(dev, connector, &vesadrm_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret)
+ return ERR_PTR(ret);
+ drm_connector_helper_add(connector, &vesadrm_connector_helper_funcs);
+ drm_connector_set_panel_orientation_with_quirk(connector,
+ DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
+ width, height);
+
+ ret = drm_connector_attach_encoder(connector, encoder);
+ if (ret)
+ return ERR_PTR(ret);
+
+ drm_mode_config_reset(dev);
+
+ return vesa;
+}
+
+/*
+ * DRM driver
+ */
+
+DEFINE_DRM_GEM_FOPS(vesadrm_fops);
+
+static struct drm_driver vesadrm_driver = {
+ DRM_GEM_SHMEM_DRIVER_OPS,
+ DRM_FBDEV_SHMEM_DRIVER_OPS,
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+ .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
+ .fops = &vesadrm_fops,
+};
+
+/*
+ * Platform driver
+ */
+
+static int vesadrm_probe(struct platform_device *pdev)
+{
+ struct vesadrm_device *vesa;
+ struct drm_sysfb_device *sysfb;
+ struct drm_device *dev;
+ int ret;
+
+ vesa = vesadrm_device_create(&vesadrm_driver, pdev);
+ if (IS_ERR(vesa))
+ return PTR_ERR(vesa);
+ sysfb = &vesa->sysfb;
+ dev = &sysfb->dev;
+
+ ret = drm_dev_register(dev, 0);
+ if (ret)
+ return ret;
+
+ drm_client_setup(dev, sysfb->fb_format);
+
+ return 0;
+}
+
+static void vesadrm_remove(struct platform_device *pdev)
+{
+ struct drm_device *dev = platform_get_drvdata(pdev);
+
+ drm_dev_unplug(dev);
+}
+
+static struct platform_driver vesadrm_platform_driver = {
+ .driver = {
+ .name = "vesa-framebuffer",
+ },
+ .probe = vesadrm_probe,
+ .remove = vesadrm_remove,
+};
+
+module_platform_driver(vesadrm_platform_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");