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Commit 0a6659bd authored by Gerd Hoffmann's avatar Gerd Hoffmann Committed by Dave Airlie
Browse files

drm/bochs: new driver 



DRM driver for (virtual) vga cards using the bochs dispi
interface, such as the qemu standard vga (qemu -vga std).

Don't bother supporting anything but 32bpp for now, even
though the virtual hardware is able to do that.

Known issue: mmap(/dev/fb0) doesn't work.

Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 859ae233

drivers/gpu/drm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -192,6 +192,8 @@ source "drivers/gpu/drm/tilcdc/Kconfig" 


source "drivers/gpu/drm/qxl/Kconfig"



source "drivers/gpu/drm/bochs/Kconfig"



source "drivers/gpu/drm/msm/Kconfig"



source "drivers/gpu/drm/tegra/Kconfig"

drivers/gpu/drm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/ 
obj-$(CONFIG_DRM_OMAP)	+= omapdrm/

obj-$(CONFIG_DRM_TILCDC)	+= tilcdc/

obj-$(CONFIG_DRM_QXL) += qxl/

obj-$(CONFIG_DRM_BOCHS) += bochs/

obj-$(CONFIG_DRM_MSM) += msm/

obj-$(CONFIG_DRM_TEGRA) += tegra/

obj-y			+= i2c/

drivers/gpu/drm/bochs/Kconfig

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+11 −0
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config DRM_BOCHS

	tristate "DRM Support for bochs dispi vga interface (qemu stdvga)"

	depends on DRM && PCI

	select DRM_KMS_HELPER

	select FB_SYS_FILLRECT

	select FB_SYS_COPYAREA

	select FB_SYS_IMAGEBLIT

	select DRM_TTM

	help

	  Choose this option for qemu.

	  If M is selected the module will be called bochs-drm.

drivers/gpu/drm/bochs/Makefile

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ccflags-y := -Iinclude/drm

bochs-drm-y := bochs_drv.o bochs_mm.o bochs_kms.o bochs_fbdev.o bochs_hw.o



obj-$(CONFIG_DRM_BOCHS)	+= bochs-drm.o

drivers/gpu/drm/bochs/bochs.h

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+164 −0
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#include <linux/io.h>

#include <linux/fb.h>



#include <drm/drmP.h>

#include <drm/drm_crtc.h>

#include <drm/drm_crtc_helper.h>

#include <drm/drm_fb_helper.h>



#include <ttm/ttm_bo_driver.h>

#include <ttm/ttm_page_alloc.h>



/* ---------------------------------------------------------------------- */



#define VBE_DISPI_IOPORT_INDEX           0x01CE

#define VBE_DISPI_IOPORT_DATA            0x01CF



#define VBE_DISPI_INDEX_ID               0x0

#define VBE_DISPI_INDEX_XRES             0x1

#define VBE_DISPI_INDEX_YRES             0x2

#define VBE_DISPI_INDEX_BPP              0x3

#define VBE_DISPI_INDEX_ENABLE           0x4

#define VBE_DISPI_INDEX_BANK             0x5

#define VBE_DISPI_INDEX_VIRT_WIDTH       0x6

#define VBE_DISPI_INDEX_VIRT_HEIGHT      0x7

#define VBE_DISPI_INDEX_X_OFFSET         0x8

#define VBE_DISPI_INDEX_Y_OFFSET         0x9

#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa



#define VBE_DISPI_ID0                    0xB0C0

#define VBE_DISPI_ID1                    0xB0C1

#define VBE_DISPI_ID2                    0xB0C2

#define VBE_DISPI_ID3                    0xB0C3

#define VBE_DISPI_ID4                    0xB0C4

#define VBE_DISPI_ID5                    0xB0C5



#define VBE_DISPI_DISABLED               0x00

#define VBE_DISPI_ENABLED                0x01

#define VBE_DISPI_GETCAPS                0x02

#define VBE_DISPI_8BIT_DAC               0x20

#define VBE_DISPI_LFB_ENABLED            0x40

#define VBE_DISPI_NOCLEARMEM             0x80



/* ---------------------------------------------------------------------- */



enum bochs_types {

	BOCHS_QEMU_STDVGA,

	BOCHS_UNKNOWN,

};



struct bochs_framebuffer {

	struct drm_framebuffer base;

	struct drm_gem_object *obj;

};



struct bochs_device {

	/* hw */

	void __iomem   *mmio;

	int            ioports;

	void __iomem   *fb_map;

	unsigned long  fb_base;

	unsigned long  fb_size;



	/* mode */

	u16 xres;

	u16 yres;

	u16 yres_virtual;

	u32 stride;

	u32 bpp;



	/* drm */

	struct drm_device  *dev;

	struct drm_crtc crtc;

	struct drm_encoder encoder;

	struct drm_connector connector;

	bool mode_config_initialized;



	/* ttm */

	struct {

		struct drm_global_reference mem_global_ref;

		struct ttm_bo_global_ref bo_global_ref;

		struct ttm_bo_device bdev;

		bool initialized;

	} ttm;



	/* fbdev */

	struct {

		struct bochs_framebuffer gfb;

		struct drm_fb_helper helper;

		int size;

		int x1, y1, x2, y2; /* dirty rect */

		spinlock_t dirty_lock;

		bool initialized;

	} fb;

};



#define to_bochs_framebuffer(x) container_of(x, struct bochs_framebuffer, base)



struct bochs_bo {

	struct ttm_buffer_object bo;

	struct ttm_placement placement;

	struct ttm_bo_kmap_obj kmap;

	struct drm_gem_object gem;

	u32 placements[3];

	int pin_count;

};



static inline struct bochs_bo *bochs_bo(struct ttm_buffer_object *bo)

{

	return container_of(bo, struct bochs_bo, bo);

}



static inline struct bochs_bo *gem_to_bochs_bo(struct drm_gem_object *gem)

{

	return container_of(gem, struct bochs_bo, gem);

}



#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)



static inline u64 bochs_bo_mmap_offset(struct bochs_bo *bo)

{

	return drm_vma_node_offset_addr(&bo->bo.vma_node);

}



/* ---------------------------------------------------------------------- */



/* bochs_hw.c */

int bochs_hw_init(struct drm_device *dev, uint32_t flags);

void bochs_hw_fini(struct drm_device *dev);



void bochs_hw_setmode(struct bochs_device *bochs,

		      struct drm_display_mode *mode);

void bochs_hw_setbase(struct bochs_device *bochs,

		      int x, int y, u64 addr);



/* bochs_mm.c */

int bochs_mm_init(struct bochs_device *bochs);

void bochs_mm_fini(struct bochs_device *bochs);

int bochs_mmap(struct file *filp, struct vm_area_struct *vma);



int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,

		     struct drm_gem_object **obj);

int bochs_gem_init_object(struct drm_gem_object *obj);

void bochs_gem_free_object(struct drm_gem_object *obj);

int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,

		      struct drm_mode_create_dumb *args);

int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,

			   uint32_t handle, uint64_t *offset);



int bochs_framebuffer_init(struct drm_device *dev,

			   struct bochs_framebuffer *gfb,

			   struct drm_mode_fb_cmd2 *mode_cmd,

			   struct drm_gem_object *obj);

int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr);

int bochs_bo_unpin(struct bochs_bo *bo);



extern const struct drm_mode_config_funcs bochs_mode_funcs;



/* bochs_kms.c */

int bochs_kms_init(struct bochs_device *bochs);

void bochs_kms_fini(struct bochs_device *bochs);



/* bochs_fbdev.c */

int bochs_fbdev_init(struct bochs_device *bochs);

void bochs_fbdev_fini(struct bochs_device *bochs);