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/*

 * Copyright © 2007 David Airlie

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 *

 * Authors:

 *     David Airlie

 */

    /*

     *  Modularization

     */

#include 

#include 

#include "drmP.h"

#include "drm.h"

#include "drm_crtc.h"

#include "drm_crtc_helper.h"

#include "radeon_drm.h"

#include "radeon.h"

#include "drm_fb_helper.h"

#include 

#include "radeon_object.h"

struct fb_info *framebuffer_alloc(size_t size, void *dev);

struct radeon_fb_device {

    struct drm_fb_helper        helper;

	struct radeon_framebuffer	*rfb;

	struct radeon_device		*rdev;

};

static struct fb_ops radeonfb_ops = {

//   .owner = THIS_MODULE,

	.fb_check_var = drm_fb_helper_check_var,

	.fb_set_par = drm_fb_helper_set_par,

	.fb_setcolreg = drm_fb_helper_setcolreg,

//	.fb_fillrect = cfb_fillrect,

//	.fb_copyarea = cfb_copyarea,

//	.fb_imageblit = cfb_imageblit,

//	.fb_pan_display = drm_fb_helper_pan_display,

	.fb_blank = drm_fb_helper_blank,

	.fb_setcmap = drm_fb_helper_setcmap,

};

/**

 * Currently it is assumed that the old framebuffer is reused.

 *

 * LOCKING

 * caller should hold the mode config lock.

 *

 */

int radeonfb_resize(struct drm_device *dev, struct drm_crtc *crtc)

{

	struct fb_info *info;

	struct drm_framebuffer *fb;

	struct drm_display_mode *mode = crtc->desired_mode;

	fb = crtc->fb;

	if (fb == NULL) {

		return 1;

	}

	info = fb->fbdev;

	if (info == NULL) {

		return 1;

	}

	if (mode == NULL) {

		return 1;

	}

	info->var.xres = mode->hdisplay;

	info->var.right_margin = mode->hsync_start - mode->hdisplay;

	info->var.hsync_len = mode->hsync_end - mode->hsync_start;

	info->var.left_margin = mode->htotal - mode->hsync_end;

	info->var.yres = mode->vdisplay;

	info->var.lower_margin = mode->vsync_start - mode->vdisplay;

	info->var.vsync_len = mode->vsync_end - mode->vsync_start;

	info->var.upper_margin = mode->vtotal - mode->vsync_end;

	info->var.pixclock = 10000000 / mode->htotal * 1000 / mode->vtotal * 100;

	/* avoid overflow */

	info->var.pixclock = info->var.pixclock * 1000 / mode->vrefresh;

	return 0;

}

EXPORT_SYMBOL(radeonfb_resize);

int radeon_align_pitch(struct radeon_device *rdev, int width, int bpp, bool tiled)

{

	int aligned = width;

	int align_large = (ASIC_IS_AVIVO(rdev)) || tiled;

	int pitch_mask = 0;

	switch (bpp / 8) {

	case 1:

		pitch_mask = align_large ? 255 : 127;

		break;

	case 2:

		pitch_mask = align_large ? 127 : 31;

		break;

	case 3:

	case 4:

		pitch_mask = align_large ? 63 : 15;

		break;

	}

	aligned += pitch_mask;

	aligned &= ~pitch_mask;

	return aligned;

}

static struct drm_fb_helper_funcs radeon_fb_helper_funcs = {

	.gamma_set = radeon_crtc_fb_gamma_set,

	.gamma_get = radeon_crtc_fb_gamma_get,

};

int radeonfb_create(struct drm_device *dev,

		    uint32_t fb_width, uint32_t fb_height,

		    uint32_t surface_width, uint32_t surface_height,

		    uint32_t surface_depth, uint32_t surface_bpp,

		    struct drm_framebuffer **fb_p)

{

	struct radeon_device *rdev = dev->dev_private;

	struct fb_info *info;

	struct radeon_fb_device *rfbdev;

	struct drm_framebuffer *fb = NULL;

	struct radeon_framebuffer *rfb;

	struct drm_mode_fb_cmd mode_cmd;

	struct drm_gem_object *gobj = NULL;

	struct radeon_object *robj = NULL;

    void   *device = NULL; //&rdev->pdev->dev;

	int size, aligned_size, ret;

	u64 fb_gpuaddr;

	void *fbptr = NULL;

	unsigned long tmp;

	bool fb_tiled = false; /* useful for testing */

	u32 tiling_flags = 0;

	int crtc_count;

    mode_cmd.width  = surface_width;

	mode_cmd.height = surface_height;

	/* avivo can't scanout real 24bpp */

	if ((surface_bpp == 24) && ASIC_IS_AVIVO(rdev))

		surface_bpp = 32;

	mode_cmd.bpp = 32;

	/* need to align pitch with crtc limits */

	mode_cmd.pitch = radeon_align_pitch(rdev, mode_cmd.width, mode_cmd.bpp, fb_tiled) * ((mode_cmd.bpp + 1) / 8);

	mode_cmd.depth = surface_depth;

	size = mode_cmd.pitch * mode_cmd.height;

	aligned_size = ALIGN(size, PAGE_SIZE);

    ret = radeon_gem_fb_object_create(rdev, aligned_size, 0,

			RADEON_GEM_DOMAIN_VRAM,

            false, 0,

			false, &gobj);

	if (ret) {

		printk(KERN_ERR "failed to allocate framebuffer (%d %d)\n",

		       surface_width, surface_height);

		ret = -ENOMEM;

		goto out;

	}

	robj = gobj->driver_private;

	mutex_lock(&rdev->ddev->struct_mutex);

	fb = radeon_framebuffer_create(rdev->ddev, &mode_cmd, gobj);

	if (fb == NULL) {

		DRM_ERROR("failed to allocate fb.\n");

		ret = -ENOMEM;

		goto out_unref;

	}

	ret = radeon_object_pin(robj, RADEON_GEM_DOMAIN_VRAM, &fb_gpuaddr);

	if (ret) {

		printk(KERN_ERR "failed to pin framebuffer\n");

		ret = -ENOMEM;

		goto out_unref;

	}

    list_add(&fb->filp_head, &rdev->ddev->mode_config.fb_kernel_list);

	*fb_p = fb;

	rfb = to_radeon_framebuffer(fb);

	rdev->fbdev_rfb = rfb;

	rdev->fbdev_robj = robj;

	info = framebuffer_alloc(sizeof(struct radeon_fb_device), device);

	if (info == NULL) {

		ret = -ENOMEM;

		goto out_unref;

	}

	rdev->fbdev_info = info;

	rfbdev = info->par;

	rfbdev->helper.funcs = &radeon_fb_helper_funcs;

	rfbdev->helper.dev = dev;

	if (rdev->flags & RADEON_SINGLE_CRTC)

		crtc_count = 1;

	else

		crtc_count = 2;

	ret = drm_fb_helper_init_crtc_count(&rfbdev->helper, crtc_count,

					    RADEONFB_CONN_LIMIT);

	if (ret)

		goto out_unref;

//   ret = radeon_object_kmap(robj, &fbptr);

//   if (ret) {

//       goto out_unref;

//   }

    fbptr = (void*)0xFE000000; // LFB_BASE

	strcpy(info->fix.id, "radeondrmfb");

	drm_fb_helper_fill_fix(info, fb->pitch, fb->depth);

	info->flags = FBINFO_DEFAULT;

	info->fbops = &radeonfb_ops;

	tmp = fb_gpuaddr - rdev->mc.vram_location;

	info->fix.smem_start = rdev->mc.aper_base + tmp;

	info->fix.smem_len = size;

	info->screen_base = fbptr;

	info->screen_size = size;

	drm_fb_helper_fill_var(info, fb, fb_width, fb_height);

	/* setup aperture base/size for vesafb takeover */

	info->aperture_base = rdev->ddev->mode_config.fb_base;

	info->aperture_size = rdev->mc.real_vram_size;

	info->fix.mmio_start = 0;

	info->fix.mmio_len = 0;

//   info->pixmap.size = 64*1024;

//   info->pixmap.buf_align = 8;

//   info->pixmap.access_align = 32;

//   info->pixmap.flags = FB_PIXMAP_SYSTEM;

//   info->pixmap.scan_align = 1;

	if (info->screen_base == NULL) {

		ret = -ENOSPC;

		goto out_unref;

	}

	DRM_INFO("fb mappable at 0x%lX\n",  info->fix.smem_start);

	DRM_INFO("vram apper at 0x%lX\n",  (unsigned long)rdev->mc.aper_base);

	DRM_INFO("size %lu\n", (unsigned long)size);

	DRM_INFO("fb depth is %d\n", fb->depth);

	DRM_INFO("   pitch is %d\n", fb->pitch);

    dbgprintf("fb = %x\n", fb);

	fb->fbdev = info;

	rfbdev->rfb = rfb;

	rfbdev->rdev = rdev;

	mutex_unlock(&rdev->ddev->struct_mutex);

	return 0;

out_unref:

	if (robj) {

//       radeon_object_kunmap(robj);

	}

	if (fb && ret) {

		list_del(&fb->filp_head);

 //      drm_gem_object_unreference(gobj);

//       drm_framebuffer_cleanup(fb);

		kfree(fb);

	}

//   drm_gem_object_unreference(gobj);

   mutex_unlock(&rdev->ddev->struct_mutex);

out:

	return ret;

}

int radeonfb_probe(struct drm_device *dev)

{

	return drm_fb_helper_single_fb_probe(dev, 32, &radeonfb_create);

}

int radeonfb_remove(struct drm_device *dev, struct drm_framebuffer *fb)

{

	struct fb_info *info;

	struct radeon_framebuffer *rfb = to_radeon_framebuffer(fb);

	struct radeon_object *robj;

	if (!fb) {

		return -EINVAL;

	}

	info = fb->fbdev;

	if (info) {

		struct radeon_fb_device *rfbdev = info->par;

		robj = rfb->obj->driver_private;

//       unregister_framebuffer(info);

//       radeon_object_kunmap(robj);

//       radeon_object_unpin(robj);

//       framebuffer_release(info);

	}

	printk(KERN_INFO "unregistered panic notifier\n");

	return 0;

}

EXPORT_SYMBOL(radeonfb_remove);

/**

 * Allocate a GEM object of the specified size with shmfs backing store

 */

struct drm_gem_object *

drm_gem_object_alloc(struct drm_device *dev, size_t size)

{

    struct drm_gem_object *obj;

    BUG_ON((size & (PAGE_SIZE - 1)) != 0);

    obj = kzalloc(sizeof(*obj), GFP_KERNEL);

    obj->dev = dev;

//    obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);

//    if (IS_ERR(obj->filp)) {

//        kfree(obj);

//        return NULL;

//    }

//    kref_init(&obj->refcount);

//    kref_init(&obj->handlecount);

    obj->size = size;

//    if (dev->driver->gem_init_object != NULL &&

//        dev->driver->gem_init_object(obj) != 0) {

//        fput(obj->filp);

//        kfree(obj);

//        return NULL;

//    }

//    atomic_inc(&dev->object_count);

//    atomic_add(obj->size, &dev->object_memory);

    return obj;

}

int radeon_gem_fb_object_create(struct radeon_device *rdev, int size,

                 int alignment, int initial_domain,

                 bool discardable, bool kernel,

                 bool interruptible,

                 struct drm_gem_object **obj)

{

    struct drm_gem_object *gobj;

    struct radeon_object *robj;

    *obj = NULL;

    gobj = drm_gem_object_alloc(rdev->ddev, size);

    if (!gobj) {

        return -ENOMEM;

    }

    /* At least align on page size */

    if (alignment < PAGE_SIZE) {

        alignment = PAGE_SIZE;

    }

    robj = kzalloc(sizeof(struct radeon_object), GFP_KERNEL);

    if (!robj) {

        DRM_ERROR("Failed to allocate GEM object (%d, %d, %u)\n",

              size, initial_domain, alignment);

//       mutex_lock(&rdev->ddev->struct_mutex);

//       drm_gem_object_unreference(gobj);

//       mutex_unlock(&rdev->ddev->struct_mutex);

        return -ENOMEM;;

    }

    robj->rdev = rdev;

    robj->gobj = gobj;

    INIT_LIST_HEAD(&robj->list);

    robj->flags = TTM_PL_FLAG_VRAM;

    struct drm_mm_node *vm_node;

    vm_node = kzalloc(sizeof(*vm_node),0);

    vm_node->free = 0;

    vm_node->size = 0xC00000 >> 12;

    vm_node->start = 0;

    vm_node->mm = NULL;

    robj->mm_node = vm_node;

    robj->vm_addr = ((uint32_t)robj->mm_node->start);

    gobj->driver_private = robj;

    *obj = gobj;

    return 0;

}

struct fb_info *framebuffer_alloc(size_t size, void *dev)

{

#define BYTES_PER_LONG (BITS_PER_LONG/8)

#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))

        int fb_info_size = sizeof(struct fb_info);

        struct fb_info *info;

        char *p;

        if (size)

                fb_info_size += PADDING;

        p = kzalloc(fb_info_size + size, GFP_KERNEL);

        if (!p)

                return NULL;

        info = (struct fb_info *) p;

        if (size)

                info->par = p + fb_info_size;

        return info;

#undef PADDING

#undef BYTES_PER_LONG

}