drivers/gpu/drm/ast/ast_main.c - maze/linux - Git at Google

 /*
  * Copyright 2012 Red Hat Inc.
  *
  * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  */
 /*
  * Authors: Dave Airlie <airlied@redhat.com>
  */
 #include <drm/drmP.h>
 #include "ast_drv.h"


 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>

 #include "ast_dram_tables.h"

 void ast_set_index_reg_mask(struct ast_private *ast,
 			    uint32_t base, uint8_t index,
 			    uint8_t mask, uint8_t val)
 {
 	u8 tmp;
 	ast_io_write8(ast, base, index);
 	tmp = (ast_io_read8(ast, base + 1) & mask) | val;
 	ast_set_index_reg(ast, base, index, tmp);
 }

 uint8_t ast_get_index_reg(struct ast_private *ast,
 			  uint32_t base, uint8_t index)
 {
 	uint8_t ret;
 	ast_io_write8(ast, base, index);
 	ret = ast_io_read8(ast, base + 1);
 	return ret;
 }

 uint8_t ast_get_index_reg_mask(struct ast_private *ast,
 			       uint32_t base, uint8_t index, uint8_t mask)
 {
 	uint8_t ret;
 	ast_io_write8(ast, base, index);
 	ret = ast_io_read8(ast, base + 1) & mask;
 	return ret;
 }


 static int ast_detect_chip(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;

 	if (dev->pdev->device == PCI_CHIP_AST1180) {
 		ast->chip = AST1100;
 		DRM_INFO("AST 1180 detected\n");
 	} else {
 		if (dev->pdev->revision >= 0x20) {
 			ast->chip = AST2300;
 			DRM_INFO("AST 2300 detected\n");
 		} else if (dev->pdev->revision >= 0x10) {
 			uint32_t data;
 			ast_write32(ast, 0xf004, 0x1e6e0000);
 			ast_write32(ast, 0xf000, 0x1);

 			data = ast_read32(ast, 0x1207c);
 			switch (data & 0x0300) {
 			case 0x0200:
 				ast->chip = AST1100;
 				DRM_INFO("AST 1100 detected\n");
 				break;
 			case 0x0100:
 				ast->chip = AST2200;
 				DRM_INFO("AST 2200 detected\n");
 				break;
 			case 0x0000:
 				ast->chip = AST2150;
 				DRM_INFO("AST 2150 detected\n");
 				break;
 			default:
 				ast->chip = AST2100;
 				DRM_INFO("AST 2100 detected\n");
 				break;
 			}
 			ast->vga2_clone = false;
 		} else {
 			ast->chip = 2000;
 			DRM_INFO("AST 2000 detected\n");
 		}
 	}
 	return 0;
 }

 static int ast_get_dram_info(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;
 	uint32_t data, data2;
 	uint32_t denum, num, div, ref_pll;

 	ast_write32(ast, 0xf004, 0x1e6e0000);
 	ast_write32(ast, 0xf000, 0x1);


 	ast_write32(ast, 0x10000, 0xfc600309);

 	do {
 		;
 	} while (ast_read32(ast, 0x10000) != 0x01);
 	data = ast_read32(ast, 0x10004);

 	if (data & 0x400)
 		ast->dram_bus_width = 16;
 	else
 		ast->dram_bus_width = 32;

 	if (ast->chip == AST2300) {
 		switch (data & 0x03) {
 		case 0:
 			ast->dram_type = AST_DRAM_512Mx16;
 			break;
 		default:
 		case 1:
 			ast->dram_type = AST_DRAM_1Gx16;
 			break;
 		case 2:
 			ast->dram_type = AST_DRAM_2Gx16;
 			break;
 		case 3:
 			ast->dram_type = AST_DRAM_4Gx16;
 			break;
 		}
 	} else {
 		switch (data & 0x0c) {
 		case 0:
 		case 4:
 			ast->dram_type = AST_DRAM_512Mx16;
 			break;
 		case 8:
 			if (data & 0x40)
 				ast->dram_type = AST_DRAM_1Gx16;
 			else
 				ast->dram_type = AST_DRAM_512Mx32;
 			break;
 		case 0xc:
 			ast->dram_type = AST_DRAM_1Gx32;
 			break;
 		}
 	}

 	data = ast_read32(ast, 0x10120);
 	data2 = ast_read32(ast, 0x10170);
 	if (data2 & 0x2000)
 		ref_pll = 14318;
 	else
 		ref_pll = 12000;

 	denum = data & 0x1f;
 	num = (data & 0x3fe0) >> 5;
 	data = (data & 0xc000) >> 14;
 	switch (data) {
 	case 3:
 		div = 0x4;
 		break;
 	case 2:
 	case 1:
 		div = 0x2;
 		break;
 	default:
 		div = 0x1;
 		break;
 	}
 	ast->mclk = ref_pll * (num + 2) / (denum + 2) * (div * 1000);
 	return 0;
 }

 static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb)
 {
 	struct ast_framebuffer *ast_fb = to_ast_framebuffer(fb);
 	if (ast_fb->obj)
 		drm_gem_object_unreference_unlocked(ast_fb->obj);

 	drm_framebuffer_cleanup(fb);
 	kfree(fb);
 }

 static const struct drm_framebuffer_funcs ast_fb_funcs = {
 	.destroy = ast_user_framebuffer_destroy,
 };


 int ast_framebuffer_init(struct drm_device *dev,
 			 struct ast_framebuffer *ast_fb,
 			 struct drm_mode_fb_cmd2 *mode_cmd,
 			 struct drm_gem_object *obj)
 {
 	int ret;

 	drm_helper_mode_fill_fb_struct(&ast_fb->base, mode_cmd);
 	ast_fb->obj = obj;
 	ret = drm_framebuffer_init(dev, &ast_fb->base, &ast_fb_funcs);
 	if (ret) {
 		DRM_ERROR("framebuffer init failed %d\n", ret);
 		return ret;
 	}
 	return 0;
 }

 static struct drm_framebuffer *
 ast_user_framebuffer_create(struct drm_device *dev,
 	       struct drm_file *filp,
 	       struct drm_mode_fb_cmd2 *mode_cmd)
 {
 	struct drm_gem_object *obj;
 	struct ast_framebuffer *ast_fb;
 	int ret;

 	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
 	if (obj == NULL)
 		return ERR_PTR(-ENOENT);

 	ast_fb = kzalloc(sizeof(*ast_fb), GFP_KERNEL);
 	if (!ast_fb) {
 		drm_gem_object_unreference_unlocked(obj);
 		return ERR_PTR(-ENOMEM);
 	}

 	ret = ast_framebuffer_init(dev, ast_fb, mode_cmd, obj);
 	if (ret) {
 		drm_gem_object_unreference_unlocked(obj);
 		kfree(ast_fb);
 		return ERR_PTR(ret);
 	}
 	return &ast_fb->base;
 }

 static const struct drm_mode_config_funcs ast_mode_funcs = {
 	.fb_create = ast_user_framebuffer_create,
 };

 static u32 ast_get_vram_info(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;
 	u8 jreg;

 	ast_open_key(ast);

 	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
 	switch (jreg & 3) {
 	case 0: return AST_VIDMEM_SIZE_8M;
 	case 1: return AST_VIDMEM_SIZE_16M;
 	case 2: return AST_VIDMEM_SIZE_32M;
 	case 3: return AST_VIDMEM_SIZE_64M;
 	}
 	return AST_VIDMEM_DEFAULT_SIZE;
 }

 int ast_driver_load(struct drm_device *dev, unsigned long flags)
 {
 	struct ast_private *ast;
 	int ret = 0;

 	ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
 	if (!ast)
 		return -ENOMEM;

 	dev->dev_private = ast;
 	ast->dev = dev;

 	ast->regs = pci_iomap(dev->pdev, 1, 0);
 	if (!ast->regs) {
 		ret = -EIO;
 		goto out_free;
 	}
 	ast->ioregs = pci_iomap(dev->pdev, 2, 0);
 	if (!ast->ioregs) {
 		ret = -EIO;
 		goto out_free;
 	}

 	ast_detect_chip(dev);

 	if (ast->chip != AST1180) {
 		ast_get_dram_info(dev);
 		ast->vram_size = ast_get_vram_info(dev);
 		DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size);
 	}

 	ret = ast_mm_init(ast);
 	if (ret)
 		goto out_free;

 	drm_mode_config_init(dev);

 	dev->mode_config.funcs = (void *)&ast_mode_funcs;
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;
 	dev->mode_config.preferred_depth = 24;
 	dev->mode_config.prefer_shadow = 1;

 	if (ast->chip == AST2100 ||
 	    ast->chip == AST2200 ||
 	    ast->chip == AST2300 ||
 	    ast->chip == AST1180) {
 		dev->mode_config.max_width = 1920;
 		dev->mode_config.max_height = 2048;
 	} else {
 		dev->mode_config.max_width = 1600;
 		dev->mode_config.max_height = 1200;
 	}

 	ret = ast_mode_init(dev);
 	if (ret)
 		goto out_free;

 	ret = ast_fbdev_init(dev);
 	if (ret)
 		goto out_free;

 	return 0;
 out_free:
 	kfree(ast);
 	dev->dev_private = NULL;
 	return ret;
 }

 int ast_driver_unload(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;

 	ast_mode_fini(dev);
 	ast_fbdev_fini(dev);
 	drm_mode_config_cleanup(dev);

 	ast_mm_fini(ast);
 	pci_iounmap(dev->pdev, ast->ioregs);
 	pci_iounmap(dev->pdev, ast->regs);
 	kfree(ast);
 	return 0;
 }

 int ast_gem_create(struct drm_device *dev,
 		   u32 size, bool iskernel,
 		   struct drm_gem_object **obj)
 {
 	struct ast_bo *astbo;
 	int ret;

 	*obj = NULL;

 	size = roundup(size, PAGE_SIZE);
 	if (size == 0)
 		return -EINVAL;

 	ret = ast_bo_create(dev, size, 0, 0, &astbo);
 	if (ret) {
 		if (ret != -ERESTARTSYS)
 			DRM_ERROR("failed to allocate GEM object\n");
 		return ret;
 	}
 	*obj = &astbo->gem;
 	return 0;
 }

 int ast_dumb_create(struct drm_file *file,
 		    struct drm_device *dev,
 		    struct drm_mode_create_dumb *args)
 {
 	int ret;
 	struct drm_gem_object *gobj;
 	u32 handle;

 	args->pitch = args->width * ((args->bpp + 7) / 8);
 	args->size = args->pitch * args->height;

 	ret = ast_gem_create(dev, args->size, false,
 			     &gobj);
 	if (ret)
 		return ret;

 	ret = drm_gem_handle_create(file, gobj, &handle);
 	drm_gem_object_unreference_unlocked(gobj);
 	if (ret)
 		return ret;

 	args->handle = handle;
 	return 0;
 }

 static void ast_bo_unref(struct ast_bo **bo)
 {
 	struct ttm_buffer_object *tbo;

 	if ((*bo) == NULL)
 		return;

 	tbo = &((*bo)->bo);
 	ttm_bo_unref(&tbo);
 	if (tbo == NULL)
 		*bo = NULL;

 }
 void ast_gem_free_object(struct drm_gem_object *obj)
 {
 	struct ast_bo *ast_bo = gem_to_ast_bo(obj);

 	if (!ast_bo)
 		return;
 	ast_bo_unref(&ast_bo);
 }


 static inline u64 ast_bo_mmap_offset(struct ast_bo *bo)
 {
 	return drm_vma_node_offset_addr(&bo->bo.vma_node);
 }
 int
 ast_dumb_mmap_offset(struct drm_file *file,
 		     struct drm_device *dev,
 		     uint32_t handle,
 		     uint64_t *offset)
 {
 	struct drm_gem_object *obj;
 	int ret;
 	struct ast_bo *bo;

 	mutex_lock(&dev->struct_mutex);
 	obj = drm_gem_object_lookup(dev, file, handle);
 	if (obj == NULL) {
 		ret = -ENOENT;
 		goto out_unlock;
 	}

 	bo = gem_to_ast_bo(obj);
 	*offset = ast_bo_mmap_offset(bo);

 	drm_gem_object_unreference(obj);
 	ret = 0;
 out_unlock:
 	mutex_unlock(&dev->struct_mutex);
 	return ret;

 }
	/*
	* Copyright 2012 Red Hat Inc.
	*
	* 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial portions
	* of the Software.
	*
	*/
	/*
	* Authors: Dave Airlie <airlied@redhat.com>
	*/
	#include <drm/drmP.h>
	#include "ast_drv.h"


	#include <drm/drm_fb_helper.h>
	#include <drm/drm_crtc_helper.h>

	#include "ast_dram_tables.h"

	void ast_set_index_reg_mask(struct ast_private *ast,
	uint32_t base, uint8_t index,
	uint8_t mask, uint8_t val)
	{
	u8 tmp;
	ast_io_write8(ast, base, index);
	tmp = (ast_io_read8(ast, base + 1) & mask) \| val;
	ast_set_index_reg(ast, base, index, tmp);
	}

	uint8_t ast_get_index_reg(struct ast_private *ast,
	uint32_t base, uint8_t index)
	{
	uint8_t ret;
	ast_io_write8(ast, base, index);
	ret = ast_io_read8(ast, base + 1);
	return ret;
	}

	uint8_t ast_get_index_reg_mask(struct ast_private *ast,
	uint32_t base, uint8_t index, uint8_t mask)
	{
	uint8_t ret;
	ast_io_write8(ast, base, index);
	ret = ast_io_read8(ast, base + 1) & mask;
	return ret;
	}


	static int ast_detect_chip(struct drm_device *dev)
	{
	struct ast_private *ast = dev->dev_private;

	if (dev->pdev->device == PCI_CHIP_AST1180) {
	ast->chip = AST1100;
	DRM_INFO("AST 1180 detected\n");
	} else {
	if (dev->pdev->revision >= 0x20) {
	ast->chip = AST2300;
	DRM_INFO("AST 2300 detected\n");
	} else if (dev->pdev->revision >= 0x10) {
	uint32_t data;
	ast_write32(ast, 0xf004, 0x1e6e0000);
	ast_write32(ast, 0xf000, 0x1);

	data = ast_read32(ast, 0x1207c);
	switch (data & 0x0300) {
	case 0x0200:
	ast->chip = AST1100;
	DRM_INFO("AST 1100 detected\n");
	break;
	case 0x0100:
	ast->chip = AST2200;
	DRM_INFO("AST 2200 detected\n");
	break;
	case 0x0000:
	ast->chip = AST2150;
	DRM_INFO("AST 2150 detected\n");
	break;
	default:
	ast->chip = AST2100;
	DRM_INFO("AST 2100 detected\n");
	break;
	}
	ast->vga2_clone = false;
	} else {
	ast->chip = 2000;
	DRM_INFO("AST 2000 detected\n");
	}
	}
	return 0;
	}

	static int ast_get_dram_info(struct drm_device *dev)
	{
	struct ast_private *ast = dev->dev_private;
	uint32_t data, data2;
	uint32_t denum, num, div, ref_pll;

	ast_write32(ast, 0xf004, 0x1e6e0000);
	ast_write32(ast, 0xf000, 0x1);


	ast_write32(ast, 0x10000, 0xfc600309);

	do {
	;
	} while (ast_read32(ast, 0x10000) != 0x01);
	data = ast_read32(ast, 0x10004);

	if (data & 0x400)
	ast->dram_bus_width = 16;
	else
	ast->dram_bus_width = 32;

	if (ast->chip == AST2300) {
	switch (data & 0x03) {
	case 0:
	ast->dram_type = AST_DRAM_512Mx16;
	break;
	default:
	case 1:
	ast->dram_type = AST_DRAM_1Gx16;
	break;
	case 2:
	ast->dram_type = AST_DRAM_2Gx16;
	break;
	case 3:
	ast->dram_type = AST_DRAM_4Gx16;
	break;
	}
	} else {
	switch (data & 0x0c) {
	case 0:
	case 4:
	ast->dram_type = AST_DRAM_512Mx16;
	break;
	case 8:
	if (data & 0x40)
	ast->dram_type = AST_DRAM_1Gx16;
	else
	ast->dram_type = AST_DRAM_512Mx32;
	break;
	case 0xc:
	ast->dram_type = AST_DRAM_1Gx32;
	break;
	}
	}

	data = ast_read32(ast, 0x10120);
	data2 = ast_read32(ast, 0x10170);
	if (data2 & 0x2000)
	ref_pll = 14318;
	else
	ref_pll = 12000;

	denum = data & 0x1f;
	num = (data & 0x3fe0) >> 5;
	data = (data & 0xc000) >> 14;
	switch (data) {
	case 3:
	div = 0x4;
	break;
	case 2:
	case 1:
	div = 0x2;
	break;
	default:
	div = 0x1;
	break;
	}
	ast->mclk = ref_pll * (num + 2) / (denum + 2) * (div * 1000);
	return 0;
	}

	static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb)
	{
	struct ast_framebuffer *ast_fb = to_ast_framebuffer(fb);
	if (ast_fb->obj)
	drm_gem_object_unreference_unlocked(ast_fb->obj);

	drm_framebuffer_cleanup(fb);
	kfree(fb);
	}

	static const struct drm_framebuffer_funcs ast_fb_funcs = {
	.destroy = ast_user_framebuffer_destroy,
	};


	int ast_framebuffer_init(struct drm_device *dev,
	struct ast_framebuffer *ast_fb,
	struct drm_mode_fb_cmd2 *mode_cmd,
	struct drm_gem_object *obj)
	{
	int ret;

	drm_helper_mode_fill_fb_struct(&ast_fb->base, mode_cmd);
	ast_fb->obj = obj;
	ret = drm_framebuffer_init(dev, &ast_fb->base, &ast_fb_funcs);
	if (ret) {
	DRM_ERROR("framebuffer init failed %d\n", ret);
	return ret;
	}
	return 0;
	}

	static struct drm_framebuffer *
	ast_user_framebuffer_create(struct drm_device *dev,
	struct drm_file *filp,
	struct drm_mode_fb_cmd2 *mode_cmd)
	{
	struct drm_gem_object *obj;
	struct ast_framebuffer *ast_fb;
	int ret;

	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
	if (obj == NULL)
	return ERR_PTR(-ENOENT);

	ast_fb = kzalloc(sizeof(*ast_fb), GFP_KERNEL);
	if (!ast_fb) {
	drm_gem_object_unreference_unlocked(obj);
	return ERR_PTR(-ENOMEM);
	}

	ret = ast_framebuffer_init(dev, ast_fb, mode_cmd, obj);
	if (ret) {
	drm_gem_object_unreference_unlocked(obj);
	kfree(ast_fb);
	return ERR_PTR(ret);
	}
	return &ast_fb->base;
	}

	static const struct drm_mode_config_funcs ast_mode_funcs = {
	.fb_create = ast_user_framebuffer_create,
	};

	static u32 ast_get_vram_info(struct drm_device *dev)
	{
	struct ast_private *ast = dev->dev_private;
	u8 jreg;

	ast_open_key(ast);

	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
	switch (jreg & 3) {
	case 0: return AST_VIDMEM_SIZE_8M;
	case 1: return AST_VIDMEM_SIZE_16M;
	case 2: return AST_VIDMEM_SIZE_32M;
	case 3: return AST_VIDMEM_SIZE_64M;
	}
	return AST_VIDMEM_DEFAULT_SIZE;
	}

	int ast_driver_load(struct drm_device *dev, unsigned long flags)
	{
	struct ast_private *ast;
	int ret = 0;

	ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
	if (!ast)
	return -ENOMEM;

	dev->dev_private = ast;
	ast->dev = dev;

	ast->regs = pci_iomap(dev->pdev, 1, 0);
	if (!ast->regs) {
	ret = -EIO;
	goto out_free;
	}
	ast->ioregs = pci_iomap(dev->pdev, 2, 0);
	if (!ast->ioregs) {
	ret = -EIO;
	goto out_free;
	}

	ast_detect_chip(dev);

	if (ast->chip != AST1180) {
	ast_get_dram_info(dev);
	ast->vram_size = ast_get_vram_info(dev);
	DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size);
	}

	ret = ast_mm_init(ast);
	if (ret)
	goto out_free;

	drm_mode_config_init(dev);

	dev->mode_config.funcs = (void *)&ast_mode_funcs;
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;
	dev->mode_config.preferred_depth = 24;
	dev->mode_config.prefer_shadow = 1;

	if (ast->chip == AST2100 \|\|
	ast->chip == AST2200 \|\|
	ast->chip == AST2300 \|\|
	ast->chip == AST1180) {
	dev->mode_config.max_width = 1920;
	dev->mode_config.max_height = 2048;
	} else {
	dev->mode_config.max_width = 1600;
	dev->mode_config.max_height = 1200;
	}

	ret = ast_mode_init(dev);
	if (ret)
	goto out_free;

	ret = ast_fbdev_init(dev);
	if (ret)
	goto out_free;

	return 0;
	out_free:
	kfree(ast);
	dev->dev_private = NULL;
	return ret;
	}

	int ast_driver_unload(struct drm_device *dev)
	{
	struct ast_private *ast = dev->dev_private;

	ast_mode_fini(dev);
	ast_fbdev_fini(dev);
	drm_mode_config_cleanup(dev);

	ast_mm_fini(ast);
	pci_iounmap(dev->pdev, ast->ioregs);
	pci_iounmap(dev->pdev, ast->regs);
	kfree(ast);
	return 0;
	}

	int ast_gem_create(struct drm_device *dev,
	u32 size, bool iskernel,
	struct drm_gem_object **obj)
	{
	struct ast_bo *astbo;
	int ret;

	*obj = NULL;

	size = roundup(size, PAGE_SIZE);
	if (size == 0)
	return -EINVAL;

	ret = ast_bo_create(dev, size, 0, 0, &astbo);
	if (ret) {
	if (ret != -ERESTARTSYS)
	DRM_ERROR("failed to allocate GEM object\n");
	return ret;
	}
	*obj = &astbo->gem;
	return 0;
	}

	int ast_dumb_create(struct drm_file *file,
	struct drm_device *dev,
	struct drm_mode_create_dumb *args)
	{
	int ret;
	struct drm_gem_object *gobj;
	u32 handle;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	ret = ast_gem_create(dev, args->size, false,
	&gobj);
	if (ret)
	return ret;

	ret = drm_gem_handle_create(file, gobj, &handle);
	drm_gem_object_unreference_unlocked(gobj);
	if (ret)
	return ret;

	args->handle = handle;
	return 0;
	}

	static void ast_bo_unref(struct ast_bo **bo)
	{
	struct ttm_buffer_object *tbo;

	if ((*bo) == NULL)
	return;

	tbo = &((*bo)->bo);
	ttm_bo_unref(&tbo);
	if (tbo == NULL)
	*bo = NULL;

	}
	void ast_gem_free_object(struct drm_gem_object *obj)
	{
	struct ast_bo *ast_bo = gem_to_ast_bo(obj);

	if (!ast_bo)
	return;
	ast_bo_unref(&ast_bo);
	}


	static inline u64 ast_bo_mmap_offset(struct ast_bo *bo)
	{
	return drm_vma_node_offset_addr(&bo->bo.vma_node);
	}
	int
	ast_dumb_mmap_offset(struct drm_file *file,
	struct drm_device *dev,
	uint32_t handle,
	uint64_t *offset)
	{
	struct drm_gem_object *obj;
	int ret;
	struct ast_bo *bo;

	mutex_lock(&dev->struct_mutex);
	obj = drm_gem_object_lookup(dev, file, handle);
	if (obj == NULL) {
	ret = -ENOENT;
	goto out_unlock;
	}

	bo = gem_to_ast_bo(obj);
	*offset = ast_bo_mmap_offset(bo);

	drm_gem_object_unreference(obj);
	ret = 0;
	out_unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;

	}