diff options
Diffstat (limited to 'drivers/gpu/drm/gma500/fbdev.c')
| -rw-r--r-- | drivers/gpu/drm/gma500/fbdev.c | 196 |
1 files changed, 196 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..c26926babc2a --- /dev/null +++ b/drivers/gpu/drm/gma500/fbdev.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-only +/************************************************************************** + * Copyright (c) 2007-2011, Intel Corporation. + * All Rights Reserved. + * + **************************************************************************/ + +#include <linux/fb.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); + 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 + */ + +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); + drm_framebuffer_cleanup(fb); + kfree(fb); + + drm_gem_object_put(obj); + + drm_client_release(&fb_helper->client); +} + +static const struct fb_ops psb_fbdev_fb_ops = { + .owner = THIS_MODULE, + __FB_DEFAULT_IOMEM_OPS_RDWR, + DRM_FB_HELPER_DEFAULT_OPS, + __FB_DEFAULT_IOMEM_OPS_DRAW, + .fb_mmap = psb_fbdev_fb_mmap, + .fb_destroy = psb_fbdev_fb_destroy, +}; + +static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = { +}; + +/* + * struct drm_driver + */ + +int psb_fbdev_driver_fbdev_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 = fb_helper->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, + drm_get_format_info(dev, mode_cmd.pixel_format, + mode_cmd.modifier[0]), + &mode_cmd, obj); + if (IS_ERR(fb)) { + ret = PTR_ERR(fb); + goto err_drm_gem_object_put; + } + + fb_helper->funcs = &psb_fbdev_fb_helper_funcs; + fb_helper->fb = fb; + + info->fbops = &psb_fbdev_fb_ops; + + /* 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); + + fb_memset_io(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_gem_object_put: + drm_gem_object_put(obj); + return ret; +} |