amifb.c

Linux环境下视频显示卡设备的驱动程序源代码

#define FMODE_BSCAN2	(0x4000) /* Use PF2 modulus every other line */
#define FMODE_SPAGEM	(0x0008) /* Sprite page mode */
#define FMODE_SPR32	(0x0004) /* Sprite 32 bit fetch */
#define FMODE_BPAGEM	(0x0002) /* Bitplane page mode */
#define FMODE_BPL32	(0x0001) /* Bitplane 32 bit fetch */

	/*
	 * Tags used to indicate a specific Pixel Clock
	 *
	 * clk_shift is the shift value to get the timings in 35 ns units
	 */

enum { TAG_SHRES, TAG_HIRES, TAG_LORES };

	/*
	 * Tags used to indicate the specific chipset
	 */

enum { TAG_OCS, TAG_ECS, TAG_AGA };

	/*
	 * Tags used to indicate the memory bandwidth
	 */

enum { TAG_FMODE_1, TAG_FMODE_2, TAG_FMODE_4 };


	/*
	 * Clock Definitions, Maximum Display Depth
	 *
	 * These depend on the E-Clock or the Chipset, so they are filled in
	 * dynamically
	 */

static u_long pixclock[3];	/* SHRES/HIRES/LORES: index = clk_shift */
static u_short maxdepth[3];	/* SHRES/HIRES/LORES: index = clk_shift */
static u_short maxfmode, chipset;


	/*
	 * Broadcast Video Timings
	 *
	 * Horizontal values are in 35 ns (SHRES) units
	 * Vertical values are in interlaced scanlines
	 */

#define PAL_DIWSTRT_H	(360)	/* PAL Window Limits */
#define PAL_DIWSTRT_V	(48)
#define PAL_HTOTAL	(1816)
#define PAL_VTOTAL	(625)

#define NTSC_DIWSTRT_H	(360)	/* NTSC Window Limits */
#define NTSC_DIWSTRT_V	(40)
#define NTSC_HTOTAL	(1816)
#define NTSC_VTOTAL	(525)


	/*
	 * Various macros
	 */

#define up2(v)		(((v)+1) & -2)
#define down2(v)	((v) & -2)
#define div2(v)		((v)>>1)
#define mod2(v)		((v) & 1)

#define up4(v)		(((v)+3) & -4)
#define down4(v)	((v) & -4)
#define mul4(v)		((v)<<2)
#define div4(v)		((v)>>2)
#define mod4(v)		((v) & 3)

#define up8(v)		(((v)+7) & -8)
#define down8(v)	((v) & -8)
#define div8(v)		((v)>>3)
#define mod8(v)		((v) & 7)

#define up16(v)		(((v)+15) & -16)
#define down16(v)	((v) & -16)
#define div16(v)	((v)>>4)
#define mod16(v)	((v) & 15)

#define up32(v)		(((v)+31) & -32)
#define down32(v)	((v) & -32)
#define div32(v)	((v)>>5)
#define mod32(v)	((v) & 31)

#define up64(v)		(((v)+63) & -64)
#define down64(v)	((v) & -64)
#define div64(v)	((v)>>6)
#define mod64(v)	((v) & 63)

#define upx(x,v)	(((v)+(x)-1) & -(x))
#define downx(x,v)	((v) & -(x))
#define modx(x,v)	((v) & ((x)-1))

/* if x1 is not a constant, this macro won't make real sense :-) */
#ifdef __mc68000__
#define DIVUL(x1, x2) ({int res; asm("divul %1,%2,%3": "=d" (res): \
	"d" (x2), "d" ((long)((x1)/0x100000000ULL)), "0" ((long)(x1))); res;})
#else
/* We know a bit about the numbers, so we can do it this way */
#define DIVUL(x1, x2) ((((long)((unsigned long long)x1 >> 8) / x2) << 8) + \
	((((long)((unsigned long long)x1 >> 8) % x2) << 8) / x2))
#endif

#define highw(x)	((u_long)(x)>>16 & 0xffff)
#define loww(x)		((u_long)(x) & 0xffff)

#define custom		amiga_custom

#define VBlankOn()	custom.intena = IF_SETCLR|IF_COPER
#define VBlankOff()	custom.intena = IF_COPER


	/*
	 * Chip RAM we reserve for the Frame Buffer
	 *
	 * This defines the Maximum Virtual Screen Size
	 * (Setable per kernel options?)
	 */

#define VIDEOMEMSIZE_AGA_2M	(1310720) /* AGA (2MB) : max 1280*1024*256  */
#define VIDEOMEMSIZE_AGA_1M	(786432)  /* AGA (1MB) : max 1024*768*256   */
#define VIDEOMEMSIZE_ECS_2M	(655360)  /* ECS (2MB) : max 1280*1024*16   */
#define VIDEOMEMSIZE_ECS_1M	(393216)  /* ECS (1MB) : max 1024*768*16    */
#define VIDEOMEMSIZE_OCS	(262144)  /* OCS       : max ca. 800*600*16 */

#define SPRITEMEMSIZE		(64*64/4) /* max 64*64*4 */
#define DUMMYSPRITEMEMSIZE	(8)
static u_long spritememory;

#define CHIPRAM_SAFETY_LIMIT	(16384)

static u_long videomemory;

	/*
	 * This is the earliest allowed start of fetching display data.
	 * Only if you really want no hardware cursor and audio,
	 * set this to 128, but let it better at 192
	 */

static u_long min_fstrt = 192;

#define assignchunk(name, type, ptr, size) \
{ \
	(name) = (type)(ptr); \
	ptr += size; \
}


	/*
	 * Copper Instructions
	 */

#define CMOVE(val, reg)		(CUSTOM_OFS(reg)<<16 | (val))
#define CMOVE2(val, reg)	((CUSTOM_OFS(reg)+2)<<16 | (val))
#define CWAIT(x, y)		(((y) & 0x1fe)<<23 | ((x) & 0x7f0)<<13 | 0x0001fffe)
#define CEND			(0xfffffffe)


typedef union {
	u_long l;
	u_short w[2];
} copins;

static struct copdisplay {
	copins *init;
	copins *wait;
	copins *list[2][2];
	copins *rebuild[2];
} copdisplay;

static u_short currentcop = 0;

	/*
	 * Hardware Cursor API Definitions
	 * These used to be in linux/fb.h, but were preliminary and used by
	 * amifb only anyway
	 */

#define FBIOGET_FCURSORINFO     0x4607
#define FBIOGET_VCURSORINFO     0x4608
#define FBIOPUT_VCURSORINFO     0x4609
#define FBIOGET_CURSORSTATE     0x460A
#define FBIOPUT_CURSORSTATE     0x460B


struct fb_fix_cursorinfo {
	__u16 crsr_width;		/* width and height of the cursor in */
	__u16 crsr_height;		/* pixels (zero if no cursor)	*/
	__u16 crsr_xsize;		/* cursor size in display pixels */
	__u16 crsr_ysize;
	__u16 crsr_color1;		/* colormap entry for cursor color1 */
	__u16 crsr_color2;		/* colormap entry for cursor color2 */
};

struct fb_var_cursorinfo {
	__u16 width;
	__u16 height;
	__u16 xspot;
	__u16 yspot;
	__u8 data[1];			/* field with [height][width]        */
};

struct fb_cursorstate {
	__s16 xoffset;
	__s16 yoffset;
	__u16 mode;
};

#define FB_CURSOR_OFF		0
#define FB_CURSOR_ON		1
#define FB_CURSOR_FLASH		2


	/*
	 * Hardware Cursor
	 */

static int cursorrate = 20;	/* Number of frames/flash toggle */
static u_short cursorstate = -1;
static u_short cursormode = FB_CURSOR_OFF;

static u_short *lofsprite, *shfsprite, *dummysprite;

	/*
	 * Current Video Mode
	 */

static struct amifb_par {

	/* General Values */

	int xres;		/* vmode */
	int yres;		/* vmode */
	int vxres;		/* vmode */
	int vyres;		/* vmode */
	int xoffset;		/* vmode */
	int yoffset;		/* vmode */
	u_short bpp;		/* vmode */
	u_short clk_shift;	/* vmode */
	u_short line_shift;	/* vmode */
	int vmode;		/* vmode */
	u_short diwstrt_h;	/* vmode */
	u_short diwstop_h;	/* vmode */
	u_short diwstrt_v;	/* vmode */
	u_short diwstop_v;	/* vmode */
	u_long next_line;	/* modulo for next line */
	u_long next_plane;	/* modulo for next plane */

	/* Cursor Values */

	struct {
		short crsr_x;	/* movecursor */
		short crsr_y;	/* movecursor */
		short spot_x;
		short spot_y;
		u_short height;
		u_short width;
		u_short fmode;
	} crsr;

	/* OCS Hardware Registers */

	u_long bplpt0;		/* vmode, pan (Note: physical address) */
	u_long bplpt0wrap;	/* vmode, pan (Note: physical address) */
	u_short ddfstrt;
	u_short ddfstop;
	u_short bpl1mod;
	u_short bpl2mod;
	u_short bplcon0;	/* vmode */
	u_short bplcon1;	/* vmode */
	u_short htotal;		/* vmode */
	u_short vtotal;		/* vmode */

	/* Additional ECS Hardware Registers */

	u_short bplcon3;	/* vmode */
	u_short beamcon0;	/* vmode */
	u_short hsstrt;		/* vmode */
	u_short hsstop;		/* vmode */
	u_short hbstrt;		/* vmode */
	u_short hbstop;		/* vmode */
	u_short vsstrt;		/* vmode */
	u_short vsstop;		/* vmode */
	u_short vbstrt;		/* vmode */
	u_short vbstop;		/* vmode */
	u_short hcenter;	/* vmode */

	/* Additional AGA Hardware Registers */

	u_short fmode;		/* vmode */
} currentpar;


static struct fb_info fb_info = {
    .fix = {
	.id		= "Amiga ",
	.visual		= FB_VISUAL_PSEUDOCOLOR,
	.accel		= FB_ACCEL_AMIGABLITT
    }
};


	/*
	 *  Saved color entry 0 so we can restore it when unblanking
	 */

static u_char red0, green0, blue0;


#if defined(CONFIG_FB_AMIGA_ECS)
static u_short ecs_palette[32];
#endif


	/*
	 * Latches for Display Changes during VBlank
	 */

static u_short do_vmode_full = 0;	/* Change the Video Mode */
static u_short do_vmode_pan = 0;	/* Update the Video Mode */
static short do_blank = 0;		/* (Un)Blank the Screen (±1) */
static u_short do_cursor = 0;		/* Move the Cursor */


	/*
	 * Various Flags
	 */

static u_short is_blanked = 0;		/* Screen is Blanked */
static u_short is_lace = 0;		/* Screen is laced */

	/*
	 * Predefined Video Modes
	 *
	 */

static struct fb_videomode ami_modedb[] __initdata = {

    /*
     *  AmigaOS Video Modes
     *
     *  If you change these, make sure to update DEFMODE_* as well!
     */

    {
	/* 640x200, 15 kHz, 60 Hz (NTSC) */
	"ntsc", 60, 640, 200, TAG_HIRES, 106, 86, 44, 16, 76, 2,
	FB_SYNC_BROADCAST, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x400, 15 kHz, 60 Hz interlaced (NTSC) */
	"ntsc-lace", 60, 640, 400, TAG_HIRES, 106, 86, 88, 33, 76, 4,
	FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x256, 15 kHz, 50 Hz (PAL) */
	"pal", 50, 640, 256, TAG_HIRES, 106, 86, 40, 14, 76, 2,
	FB_SYNC_BROADCAST, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x512, 15 kHz, 50 Hz interlaced (PAL) */
	"pal-lace", 50, 640, 512, TAG_HIRES, 106, 86, 80, 29, 76, 4,
	FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x480, 29 kHz, 57 Hz */
	"multiscan", 57, 640, 480, TAG_SHRES, 96, 112, 29, 8, 72, 8,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x960, 29 kHz, 57 Hz interlaced */
	"multiscan-lace", 57, 640, 960, TAG_SHRES, 96, 112, 58, 16, 72, 16,
	0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x200, 15 kHz, 72 Hz */
	"euro36", 72, 640, 200, TAG_HIRES, 92, 124, 6, 6, 52, 5,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x400, 15 kHz, 72 Hz interlaced */
	"euro36-lace", 72, 640, 400, TAG_HIRES, 92, 124, 12, 12, 52, 10,
	0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x400, 29 kHz, 68 Hz */
	"euro72", 68, 640, 400, TAG_SHRES, 164, 92, 9, 9, 80, 8,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x800, 29 kHz, 68 Hz interlaced */
	"euro72-lace", 68, 640, 800, TAG_SHRES, 164, 92, 18, 18, 80, 16,
	0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 800x300, 23 kHz, 70 Hz */
	"super72", 70, 800, 300, TAG_SHRES, 212, 140, 10, 11, 80, 7,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 800x600, 23 kHz, 70 Hz interlaced */
	"super72-lace", 70, 800, 600, TAG_SHRES, 212, 140, 20, 22, 80, 14,
	0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x200, 27 kHz, 57 Hz doublescan */
	"dblntsc", 57, 640, 200, TAG_SHRES, 196, 124, 18, 17, 80, 4,
	0, FB_VMODE_DOUBLE | FB_VMODE_YWRAP
    }, {
	/* 640x400, 27 kHz, 57 Hz */
	"dblntsc-ff", 57, 640, 400, TAG_SHRES, 196, 124, 36, 35, 80, 7,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x800, 27 kHz, 57 Hz interlaced */
	"dblntsc-lace", 57, 640, 800, TAG_SHRES, 196, 124, 72, 70, 80, 14,
	0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x256, 27 kHz, 47 Hz doublescan */
	"dblpal", 47, 640, 256, TAG_SHRES, 196, 124, 14, 13, 80, 4,
	0, FB_VMODE_DOUBLE | FB_VMODE_YWRAP
    }, {
	/* 640x512, 27 kHz, 47 Hz */
	"dblpal-ff", 47, 640, 512, TAG_SHRES, 196, 124, 28, 27, 80, 7,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x1024, 27 kHz, 47 Hz interlaced */
	"dblpal-lace", 47, 640, 1024, TAG_SHRES, 196, 124, 56, 54, 80, 14,
	0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    },

    /*
     *  VGA Video Modes
     */

    {
	/* 640x480, 31 kHz, 60 Hz (VGA) */
	"vga", 60, 640, 480, TAG_SHRES, 64, 96, 30, 9, 112, 2,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 640x400, 31 kHz, 70 Hz (VGA) */
	"vga70", 70, 640, 400, TAG_SHRES, 64, 96, 35, 12, 112, 2,
	FB_SYNC_VERT_HIGH_ACT | FB_SYNC_COMP_HIGH_ACT, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    },

#if 0

    /*
     *  A2024 video modes
     *  These modes don't work yet because there's no A2024 driver.
     */

    {
	/* 1024x800, 10 Hz */
	"a2024-10", 10, 1024, 800, TAG_HIRES, 0, 0, 0, 0, 0, 0,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }, {
	/* 1024x800, 15 Hz */
	"a2024-15", 15, 1024, 800, TAG_HIRES, 0, 0, 0, 0, 0, 0,
	0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
    }
#endif
};

#define NUM_TOTAL_MODES  ARRAY_SIZE(ami_modedb)

static char *mode_option __initdata = NULL;
static int round_down_bpp = 1;	/* for mode probing */

	/*
	 * Some default modes
	 */


#define DEFMODE_PAL	    2	/* "pal" for PAL OCS/ECS */
#define DEFMODE_NTSC	    0	/* "ntsc" for NTSC OCS/ECS */
#define DEFMODE_AMBER_PAL   3	/* "pal-lace" for flicker fixed PAL (A3000) */
#define DEFMODE_AMBER_NTSC  1	/* "ntsc-lace" for flicker fixed NTSC (A3000) */
#define DEFMODE_AGA	    19	/* "vga70" for AGA */


static int amifb_ilbm = 0;	/* interleaved or normal bitplanes */
static int amifb_inverse = 0;


	/*
	 * Macros for the conversion from real world values to hardware register
	 * values
	 *
	 * This helps us to keep our attention on the real stuff...
	 *