1 files changed, 344 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/fbdev.c b/drivers/gpu/drm/gma500/fbdev.c
new file mode 100644
index 000000000000..62287407e717
--- /dev/null
+++ b/drivers/gpu/drm/gma500/fbdev.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/**************************************************************************
+ * Copyright (c) 2007-2011, Intel Corporation.
+ * All Rights Reserved.
+ *
+ **************************************************************************/
+
+#include <linux/pfn_t.h>
+
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_framebuffer.h>
+
+#include "gem.h"
+#include "psb_drv.h"
+
+/*
+ * VM area struct
+ */
+
+static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct fb_info *info = vma->vm_private_data;
+	unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
+	unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
+	vm_fault_t err = VM_FAULT_SIGBUS;
+	unsigned long page_num = vma_pages(vma);
+	unsigned long i;
+
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	for (i = 0; i < page_num; ++i) {
+		err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV));
+		if (unlikely(err & VM_FAULT_ERROR))
+			break;
+		address += PAGE_SIZE;
+		++pfn;
+	}
+
+	return err;
+}
+
+static const struct vm_operations_struct psb_fbdev_vm_ops = {
+	.fault	= psb_fbdev_vm_fault,
+};
+
+/*
+ * struct fb_ops
+ */
+
+#define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
+
+static int psb_fbdev_fb_setcolreg(unsigned int regno,
+				  unsigned int red, unsigned int green,
+				  unsigned int blue, unsigned int transp,
+				  struct fb_info *info)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_framebuffer *fb = fb_helper->fb;
+	uint32_t v;
+
+	if (!fb)
+		return -ENOMEM;
+
+	if (regno > 255)
+		return 1;
+
+	red = CMAP_TOHW(red, info->var.red.length);
+	blue = CMAP_TOHW(blue, info->var.blue.length);
+	green = CMAP_TOHW(green, info->var.green.length);
+	transp = CMAP_TOHW(transp, info->var.transp.length);
+
+	v = (red << info->var.red.offset) |
+	    (green << info->var.green.offset) |
+	    (blue << info->var.blue.offset) |
+	    (transp << info->var.transp.offset);
+
+	if (regno < 16) {
+		switch (fb->format->cpp[0] * 8) {
+		case 16:
+			((uint32_t *) info->pseudo_palette)[regno] = v;
+			break;
+		case 24:
+		case 32:
+			((uint32_t *) info->pseudo_palette)[regno] = v;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	if (vma->vm_pgoff != 0)
+		return -EINVAL;
+	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+		return -EINVAL;
+
+	/*
+	 * If this is a GEM object then info->screen_base is the virtual
+	 * kernel remapping of the object. FIXME: Review if this is
+	 * suitable for our mmap work
+	 */
+	vma->vm_ops = &psb_fbdev_vm_ops;
+	vma->vm_private_data = info;
+	vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP);
+
+	return 0;
+}
+
+static void psb_fbdev_fb_destroy(struct fb_info *info)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_framebuffer *fb = fb_helper->fb;
+	struct drm_gem_object *obj = fb->obj[0];
+
+	drm_fb_helper_fini(fb_helper);
+
+	drm_framebuffer_unregister_private(fb);
+	fb->obj[0] = NULL;
+	drm_framebuffer_cleanup(fb);
+	kfree(fb);
+
+	drm_gem_object_put(obj);
+
+	drm_client_release(&fb_helper->client);
+
+	drm_fb_helper_unprepare(fb_helper);
+	kfree(fb_helper);
+}
+
+static const struct fb_ops psb_fbdev_fb_ops = {
+	.owner = THIS_MODULE,
+	DRM_FB_HELPER_DEFAULT_OPS,
+	.fb_setcolreg = psb_fbdev_fb_setcolreg,
+	.fb_read = drm_fb_helper_cfb_read,
+	.fb_write = drm_fb_helper_cfb_write,
+	.fb_fillrect = drm_fb_helper_cfb_fillrect,
+	.fb_copyarea = drm_fb_helper_cfb_copyarea,
+	.fb_imageblit = drm_fb_helper_cfb_imageblit,
+	.fb_mmap = psb_fbdev_fb_mmap,
+	.fb_destroy = psb_fbdev_fb_destroy,
+};
+
+/*
+ * struct drm_fb_helper_funcs
+ */
+
+static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
+			      struct drm_fb_helper_surface_size *sizes)
+{
+	struct drm_device *dev = fb_helper->dev;
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	struct fb_info *info;
+	struct drm_framebuffer *fb;
+	struct drm_mode_fb_cmd2 mode_cmd = { };
+	int size;
+	int ret;
+	struct psb_gem_object *backing;
+	struct drm_gem_object *obj;
+	u32 bpp, depth;
+
+	/* No 24-bit packed mode */
+	if (sizes->surface_bpp == 24) {
+		sizes->surface_bpp = 32;
+		sizes->surface_depth = 24;
+	}
+	bpp = sizes->surface_bpp;
+	depth = sizes->surface_depth;
+
+	/*
+	 * If the mode does not fit in 32 bit then switch to 16 bit to get
+	 * a console on full resolution. The X mode setting server will
+	 * allocate its own 32-bit GEM framebuffer.
+	 */
+	size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
+		     sizes->surface_height;
+	size = ALIGN(size, PAGE_SIZE);
+
+	if (size > dev_priv->vram_stolen_size) {
+		sizes->surface_bpp = 16;
+		sizes->surface_depth = 16;
+	}
+	bpp = sizes->surface_bpp;
+	depth = sizes->surface_depth;
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
+
+	size = mode_cmd.pitches[0] * mode_cmd.height;
+	size = ALIGN(size, PAGE_SIZE);
+
+	/* Allocate the framebuffer in the GTT with stolen page backing */
+	backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
+	if (IS_ERR(backing))
+		return PTR_ERR(backing);
+	obj = &backing->base;
+
+	fb = psb_framebuffer_create(dev, &mode_cmd, obj);
+	if (IS_ERR(fb)) {
+		ret = PTR_ERR(fb);
+		goto err_drm_gem_object_put;
+	}
+
+	fb_helper->fb = fb;
+
+	info = drm_fb_helper_alloc_info(fb_helper);
+	if (IS_ERR(info)) {
+		ret = PTR_ERR(info);
+		goto err_drm_framebuffer_unregister_private;
+	}
+
+	info->fbops = &psb_fbdev_fb_ops;
+	info->flags = FBINFO_DEFAULT;
+	/* Accessed stolen memory directly */
+	info->screen_base = dev_priv->vram_addr + backing->offset;
+	info->screen_size = size;
+
+	drm_fb_helper_fill_info(info, fb_helper, sizes);
+
+	info->fix.smem_start = dev_priv->stolen_base + backing->offset;
+	info->fix.smem_len = size;
+	info->fix.ywrapstep = 0;
+	info->fix.ypanstep = 0;
+	info->fix.mmio_start = pci_resource_start(pdev, 0);
+	info->fix.mmio_len = pci_resource_len(pdev, 0);
+
+	memset(info->screen_base, 0, info->screen_size);
+
+	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
+
+	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
+
+	return 0;
+
+err_drm_framebuffer_unregister_private:
+	drm_framebuffer_unregister_private(fb);
+	fb->obj[0] = NULL;
+	drm_framebuffer_cleanup(fb);
+	kfree(fb);
+err_drm_gem_object_put:
+	drm_gem_object_put(obj);
+	return ret;
+}
+
+static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
+	.fb_probe = psb_fbdev_fb_probe,
+};
+
+/*
+ * struct drm_client_funcs and setup code
+ */
+
+static void psb_fbdev_client_unregister(struct drm_client_dev *client)
+{
+	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
+
+	if (fb_helper->info) {
+		drm_fb_helper_unregister_info(fb_helper);
+	} else {
+		drm_fb_helper_unprepare(fb_helper);
+		drm_client_release(&fb_helper->client);
+		kfree(fb_helper);
+	}
+}
+
+static int psb_fbdev_client_restore(struct drm_client_dev *client)
+{
+	drm_fb_helper_lastclose(client->dev);
+
+	return 0;
+}
+
+static int psb_fbdev_client_hotplug(struct drm_client_dev *client)
+{
+	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
+	struct drm_device *dev = client->dev;
+	int ret;
+
+	if (dev->fb_helper)
+		return drm_fb_helper_hotplug_event(dev->fb_helper);
+
+	ret = drm_fb_helper_init(dev, fb_helper);
+	if (ret)
+		goto err_drm_err;
+
+	if (!drm_drv_uses_atomic_modeset(dev))
+		drm_helper_disable_unused_functions(dev);
+
+	ret = drm_fb_helper_initial_config(fb_helper);
+	if (ret)
+		goto err_drm_fb_helper_fini;
+
+	return 0;
+
+err_drm_fb_helper_fini:
+	drm_fb_helper_fini(fb_helper);
+err_drm_err:
+	drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);
+	return ret;
+}
+
+static const struct drm_client_funcs psb_fbdev_client_funcs = {
+	.owner		= THIS_MODULE,
+	.unregister	= psb_fbdev_client_unregister,
+	.restore	= psb_fbdev_client_restore,
+	.hotplug	= psb_fbdev_client_hotplug,
+};
+
+void psb_fbdev_setup(struct drm_psb_private *dev_priv)
+{
+	struct drm_device *dev = &dev_priv->dev;
+	struct drm_fb_helper *fb_helper;
+	int ret;
+
+	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
+	if (!fb_helper)
+		return;
+	drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fbdev_fb_helper_funcs);
+
+	ret = drm_client_init(dev, &fb_helper->client, "fbdev-gma500", &psb_fbdev_client_funcs);
+	if (ret) {
+		drm_err(dev, "Failed to register client: %d\n", ret);
+		goto err_drm_fb_helper_unprepare;
+	}
+
+	ret = psb_fbdev_client_hotplug(&fb_helper->client);
+	if (ret)
+		drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
+
+	drm_client_register(&fb_helper->client);
+
+	return;
+
+err_drm_fb_helper_unprepare:
+	drm_fb_helper_unprepare(fb_helper);
+	kfree(fb_helper);
+}