152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Phytium display drm driver
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*
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* Copyright (C) 2021-2023, Phytium Technology Co., Ltd.
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*/
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#include <drm/drm.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_fourcc.h>
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#include "phytium_display_drv.h"
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#include "phytium_gem.h"
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#include "phytium_fb.h"
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#define PHYTIUM_MAX_CONNECTOR 1
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#define helper_to_drm_private(x) container_of(x, struct phytium_display_private, fbdev_helper)
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static void phytium_fbdev_destroy(struct fb_info *info)
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{
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struct drm_fb_helper *helper = info->par;
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struct phytium_display_private *priv = helper_to_drm_private(helper);
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phytium_gem_free_object(&priv->fbdev_phytium_gem->base);
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}
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static int phytium_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct drm_fb_helper *helper = info->par;
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struct phytium_display_private *priv = helper_to_drm_private(helper);
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return phytium_gem_mmap_obj(&priv->fbdev_phytium_gem->base, vma);
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}
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static const struct fb_ops phytium_fbdev_ops = {
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.owner = THIS_MODULE,
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DRM_FB_HELPER_DEFAULT_OPS,
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.fb_mmap = phytium_fbdev_mmap,
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FB_DEFAULT_IOMEM_OPS,
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.fb_destroy = phytium_fbdev_destroy,
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};
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static int
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phytium_drm_fbdev_create(struct drm_fb_helper *helper, struct drm_fb_helper_surface_size *sizes)
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{
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struct phytium_display_private *priv = helper_to_drm_private(helper);
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struct drm_device *dev = helper->dev;
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unsigned int bytes_per_pixel;
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struct drm_mode_fb_cmd2 mode_cmd = {0};
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struct phytium_framebuffer *phytium_fb = NULL;
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struct fb_info *fbi = NULL;
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struct drm_framebuffer *fb = NULL;
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size_t size = 0;
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int ret = 0;
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unsigned long offset;
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bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
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mode_cmd.width = sizes->surface_width;
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mode_cmd.height = sizes->surface_height;
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mode_cmd.pitches[0] = ALIGN(sizes->surface_width * bytes_per_pixel, 128);
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mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
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size = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height);
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ret = mutex_lock_interruptible(&dev->struct_mutex);
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if (ret < 0) {
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DRM_ERROR("failed to get mutex lock\n");
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return ret;
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}
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priv->fbdev_phytium_gem = phytium_gem_create_object(dev, size);
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if (!priv->fbdev_phytium_gem) {
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DRM_ERROR("failed to create gem object\n");
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return -ENOMEM;
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}
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mutex_unlock(&dev->struct_mutex);
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fbi = drm_fb_helper_alloc_info(helper);
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if (IS_ERR(fbi)) {
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DRM_DEV_ERROR(dev->dev, "Failed to create framebuffer info.");
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ret = PTR_ERR(fbi);
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goto out;
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}
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phytium_fb = phytium_fb_alloc(dev, &mode_cmd, &priv->fbdev_phytium_gem, 1);
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if (IS_ERR(phytium_fb)) {
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DRM_DEV_ERROR(dev->dev, "Failed to alloc DRM framebuffer.\n");
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ret = PTR_ERR(phytium_fb);
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goto out;
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}
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helper->fb = &(phytium_fb->base);
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fbi->par = helper;
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fbi->fbops = &phytium_fbdev_ops;
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fb = helper->fb;
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drm_fb_helper_fill_info(fbi, helper, sizes);
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offset = fbi->var.xoffset * bytes_per_pixel;
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offset += fbi->var.yoffset * fb->pitches[0];
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fbi->screen_base = priv->fbdev_phytium_gem->vaddr + offset;
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fbi->screen_size = priv->fbdev_phytium_gem->base.size;
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fbi->fix.smem_len = priv->fbdev_phytium_gem->base.size;
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DRM_DEBUG_KMS("FB [%dx%d]-%d kvaddr=%pa offset=%ld size=%zu\n", fb->width, fb->height,
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fb->format->depth, &priv->fbdev_phytium_gem->iova, offset, size);
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fbi->skip_vt_switch = true;
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return 0;
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out:
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phytium_gem_free_object(&priv->fbdev_phytium_gem->base);
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return ret;
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}
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static const struct drm_fb_helper_funcs phytium_drm_fb_helper_funcs = {
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.fb_probe = phytium_drm_fbdev_create,
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};
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int phytium_drm_fbdev_init(struct drm_device *dev)
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{
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struct phytium_display_private *priv = dev->dev_private;
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struct drm_fb_helper *helper;
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int ret;
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if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
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return -EINVAL;
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helper = &priv->fbdev_helper;
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drm_fb_helper_prepare(dev, helper, 32, &phytium_drm_fb_helper_funcs);
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ret = drm_fb_helper_init(dev, helper);
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if (ret < 0) {
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DRM_DEV_ERROR(dev->dev, "Failed to initialize drm fb helper -ret %d\n", ret);
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return ret;
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}
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ret = drm_fb_helper_initial_config(helper);
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return 0;
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}
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void phytium_drm_fbdev_fini(struct drm_device *dev)
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{
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struct phytium_display_private *priv = dev->dev_private;
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struct drm_fb_helper *helper;
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helper = &priv->fbdev_helper;
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drm_fb_helper_unregister_info(helper);
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if (helper->fb)
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drm_framebuffer_put(helper->fb);
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drm_fb_helper_fini(helper);
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}
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