patch-2.2.3 linux/drivers/video/fm2fb.c

• Lines: 573
• Date: Thu Feb 25 10:02:12 1999
• Orig file: v2.2.2/linux/drivers/video/fm2fb.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.2/linux/drivers/video/fm2fb.c linux/drivers/video/fm2fb.c
@@ -0,0 +1,572 @@
+/*
+ *  linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer
+ *				   device
+ *
+ *	Copyright (C) 1998 Steffen A. Mork (mork@ls7.cs.uni-dortmund.de)
+ *	Copyright (C) 1999 Geert Uytterhoeven
+ *
+ *  Written for 2.0.x by Steffen A. Mork
+ *  Ported to 2.1.x by Geert Uytterhoeven
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License. See the file COPYING in the main directory of this archive for
+ *  more details.
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/zorro.h>
+
+#include <asm/io.h>
+
+#include <video/fbcon.h>
+#include <video/fbcon-cfb32.h>
+
+
+/*
+ *	Some technical notes:
+ *
+ *	The BSC FrameMaster II (or Rainbow II) is a simple very dumb
+ *	frame buffer which allows to display 24 bit true color images.
+ *	Each pixel is 32 bit width so it's very easy to maintain the
+ *	frame buffer. One long word has the following layout:
+ *	AARRGGBB which means: AA the alpha channel byte, RR the red
+ *	channel, GG the green channel and BB the blue channel.
+ *
+ *	The FrameMaster II supports the following video modes.
+ *	- PAL/NTSC
+ *	- interlaced/non interlaced
+ *	- composite sync/sync/sync over green
+ *
+ *	The resolution is to the following both ones:
+ *	- 768x576 (PAL)
+ *	- 768x480 (NTSC)
+ *
+ *	This means that pixel access per line is fixed due to the
+ *	fixed line width. In case of maximal resolution the frame
+ *	buffer needs an amount of memory of 1.769.472 bytes which
+ *	is near to 2 MByte (the allocated address space of Zorro2).
+ *	The memory is channel interleaved. That means every channel
+ *	owns four VRAMs. Unfortunatly most FrameMasters II are
+ *	not assembled with memory for the alpha channel. In this
+ *	case it could be possible to add the frame buffer into the
+ *	normal memory pool.
+ *	
+ *	At relative address 0x1ffff8 of the frame buffers base address
+ *	there exists a control register with the number of
+ *	four control bits. They have the following meaning:
+ *	bit value meaning
+ *
+ *	 0    1   0=interlaced/1=non interlaced
+ *	 1    2   0=video out disabled/1=video out enabled
+ *	 2    4   0=normal mode as jumpered via JP8/1=complement mode
+ *	 3    8   0=read  onboard ROM/1 normal operation (required)
+ *
+ *	As mentioned above there are several jumper. I think there
+ *	is not very much information about the FrameMaster II in
+ *	the world so I add these information for completeness.
+ *
+ *	JP1  interlace selection (1-2 non interlaced/2-3 interlaced) 
+ *	JP2  wait state creation (leave as is!)
+ *	JP3  wait state creation (leave as is!)
+ *	JP4  modulate composite sync on green output (1-2 composite
+ *	     sync on green channel/2-3 normal composite sync)
+ *	JP5  create test signal, shorting this jumper will create
+ *	     a white screen
+ *	JP6  sync creation (1-2 composite sync/2-3 H-sync output)
+ *	JP8  video mode (1-2 PAL/2-3 NTSC)
+ *
+ *	With the following jumpering table you can connect the
+ *	FrameMaster II to a normal TV via SCART connector:
+ *	JP1:  2-3
+ *	JP4:  2-3
+ *	JP6:  2-3
+ *	JP8:  1-2 (means PAL for Europe)
+ *
+ *	NOTE:
+ *	There is no other possibility to change the video timings
+ *	except the interlaced/non interlaced, sync control and the
+ *	video mode PAL (50 Hz)/NTSC (60 Hz). Inside this
+ *	FrameMaster II driver are assumed values to avoid anomalies
+ *	to a future X server. Except the pixel clock is really
+ *	constant at 30 MHz.
+ *
+ *	9 pin female video connector:
+ *
+ *	1  analog red 0.7 Vss
+ *	2  analog green 0.7 Vss
+ *	3  analog blue 0.7 Vss
+ *	4  H-sync TTL
+ *	5  V-sync TTL
+ *	6  ground
+ *	7  ground
+ *	8  ground
+ *	9  ground
+ *
+ *	Some performance notes:
+ *	The FrameMaster II was not designed to display a console
+ *	this driver would do! It was designed to display still true
+ *	color images. Imagine: When scroll up a text line there
+ *	must copied ca. 1.7 MBytes to another place inside this
+ *	frame buffer. This means 1.7 MByte read and 1.7 MByte write
+ *	over the slow 16 bit wide Zorro2 bus! A scroll of one
+ *	line needs 1 second so do not expect to much from this
+ *	driver - he is at the limit!
+ *
+ */
+
+
+/*
+ *	definitions
+ */
+
+#define FRAMEMASTER_SIZE	0x200000
+#define FRAMEMASTER_REG		0x1ffff8
+
+#define FRAMEMASTER_NOLACE	1
+#define FRAMEMASTER_ENABLE	2
+#define FRAMEMASTER_COMPL	4
+#define FRAMEMASTER_ROM		8
+
+
+struct FrameMaster_fb_par
+{
+	int xres;
+	int yres;
+	int bpp;
+	int pixclock;
+};
+
+static unsigned long fm2fb_mem_phys;
+static void *fm2fb_mem;
+static unsigned long fm2fb_reg_phys;
+static volatile unsigned char *fm2fb_reg;
+
+#define arraysize(x)	(sizeof(x)/sizeof(*(x)))
+
+static int currcon = 0;
+static struct display disp;
+static struct fb_info fb_info;
+static struct { u_char red, green, blue, pad; } palette[16];
+#ifdef FBCON_HAS_CFB32
+static u32 fbcon_cfb32_cmap[16];
+#endif
+
+static struct fb_fix_screeninfo fb_fix;
+static struct fb_var_screeninfo fb_var;
+
+static int fm2fb_mode __initdata = -1;
+
+#define FM2FB_MODE_PAL	0
+#define FM2FB_MODE_NTSC	1
+
+static struct fb_var_screeninfo fb_var_modes[] __initdata = {
+    {
+	/* 768 x 576, 32 bpp (PAL) */
+	768, 576, 768, 576, 0, 0, 32, 0,
+	{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
+	0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
+	33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
+    }, {
+	/* 768 x 480, 32 bpp (NTSC - not supported yet */
+	768, 480, 768, 480, 0, 0, 32, 0,
+	{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
+	0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
+	33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
+    }
+};
+
+
+    /*
+     *  Interface used by the world
+     */
+
+static int fm2fb_open(struct fb_info *info, int user);
+static int fm2fb_release(struct fb_info *info, int user);
+static int fm2fb_get_fix(struct fb_fix_screeninfo *fix, int con,
+			 struct fb_info *info);
+static int fm2fb_get_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info);
+static int fm2fb_set_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info);
+static int fm2fb_pan_display(struct fb_var_screeninfo *var, int con,
+			     struct fb_info *info);
+static int fm2fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info);
+static int fm2fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info);
+static int fm2fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
+		       u_long arg, int con, struct fb_info *info);
+
+
+    /*
+     *  Interface to the low level console driver
+     */
+
+void fm2fb_init(void);
+static int fm2fbcon_switch(int con, struct fb_info *info);
+static int fm2fbcon_updatevar(int con, struct fb_info *info);
+static void fm2fbcon_blank(int blank, struct fb_info *info);
+
+
+    /*
+     *  Internal routines
+     */
+
+static int fm2fb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
+			   u_int *transp, struct fb_info *info);
+static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			   u_int transp, struct fb_info *info);
+static void do_install_cmap(int con, struct fb_info *info);
+
+
+static struct fb_ops fm2fb_ops = {
+    fm2fb_open, fm2fb_release, fm2fb_get_fix, fm2fb_get_var, fm2fb_set_var,
+    fm2fb_get_cmap, fm2fb_set_cmap, fm2fb_pan_display, fm2fb_ioctl
+};
+
+
+    /*
+     *  Open/Release the frame buffer device
+     */
+
+static int fm2fb_open(struct fb_info *info, int user)
+{
+    /*                                                                     
+     *  Nothing, only a usage count for the moment                          
+     */                                                                    
+
+    MOD_INC_USE_COUNT;
+    return(0);                              
+}
+        
+static int fm2fb_release(struct fb_info *info, int user)
+{
+    MOD_DEC_USE_COUNT;
+    return(0);                                                    
+}
+
+
+    /*
+     *  Get the Fixed Part of the Display
+     */
+
+static int fm2fb_get_fix(struct fb_fix_screeninfo *fix, int con,
+			 struct fb_info *info)
+{
+    memcpy(fix, &fb_fix, sizeof(fb_fix));
+    return 0;
+}
+
+
+    /*
+     *  Get the User Defined Part of the Display
+     */
+
+static int fm2fb_get_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info)
+{
+    memcpy(var, &fb_var, sizeof(fb_var));
+    return 0;
+}
+
+
+    /*
+     *  Set the User Defined Part of the Display
+     */
+
+static int fm2fb_set_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info)
+{
+    struct display *display;
+    int oldbpp = -1, err;
+
+    if (con >= 0)
+	display = &fb_display[con];
+    else
+	display = &disp;	/* used during initialization */
+
+    if (var->xres > fb_var.xres || var->yres > fb_var.yres ||
+	var->xres_virtual > fb_var.xres_virtual ||
+	var->yres_virtual > fb_var.yres_virtual ||
+	var->bits_per_pixel > fb_var.bits_per_pixel ||
+	var->nonstd ||
+	(var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
+	return -EINVAL;
+    memcpy(var, &fb_var, sizeof(fb_var));
+
+    if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
+	oldbpp = display->var.bits_per_pixel;
+	display->var = *var;
+    }
+    if (oldbpp != var->bits_per_pixel) {
+	if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
+	    return err;
+	do_install_cmap(con, info);
+    }
+    return 0;
+}
+
+
+    /*
+     *  Pan or Wrap the Display
+     *
+     *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
+     */
+
+static int fm2fb_pan_display(struct fb_var_screeninfo *var, int con,
+			     struct fb_info *info)
+{
+    if (var->xoffset || var->yoffset)
+	return -EINVAL;
+    else
+	return 0;
+}
+
+    /*
+     *  Get the Colormap
+     */
+
+static int fm2fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info)
+{
+    if (con == currcon) /* current console? */
+	return fb_get_cmap(cmap, kspc, fm2fb_getcolreg, info);
+    else if (fb_display[con].cmap.len) /* non default colormap? */
+	fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
+    else
+	fb_copy_cmap(fb_default_cmap(256), cmap, kspc ? 0 : 2);
+    return 0;
+}
+
+    /*
+     *  Set the Colormap
+     */
+
+static int fm2fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info)
+{
+    int err;
+
+    if (!fb_display[con].cmap.len) {	/* no colormap allocated? */
+	if ((err = fb_alloc_cmap(&fb_display[con].cmap, 256, 0)))
+	    return err;
+    }
+    if (con == currcon) {		/* current console? */
+	err = fb_set_cmap(cmap, kspc, fm2fb_setcolreg, info);
+	return err;
+    } else
+	fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
+    return 0;
+}
+
+
+static int fm2fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
+		       u_long arg, int con, struct fb_info *info)
+{
+    return -EINVAL;
+}
+
+
+    /*
+     *  Initialisation
+     */
+
+__initfunc(void fm2fb_init(void))
+{
+    int key, is_fm;
+    const struct ConfigDev *cd  = NULL;
+    unsigned long board, *ptr;
+    int x, y;
+
+    if (!(key = is_fm = zorro_find(ZORRO_PROD_BSC_FRAMEMASTER_II, 0, 0)) &&
+	!(key = zorro_find(ZORRO_PROD_HELFRICH_RAINBOW_II, 0, 0)))
+	return;
+    cd = zorro_get_board(key);
+    if (!(board = (u_long)cd->cd_BoardAddr))
+	return;
+    zorro_config_board(key, 0);
+
+    /* assigning memory to kernel space */
+    fm2fb_mem_phys = board;
+    fm2fb_mem  = ioremap(board, FRAMEMASTER_SIZE);
+    fm2fb_reg_phys = fm2fb_mem_phys+FRAMEMASTER_REG;
+    fm2fb_reg  = (unsigned char *)(fm2fb_mem+FRAMEMASTER_REG);
+
+    /* make EBU color bars on display */
+    ptr = (unsigned long *)fm2fb_mem;
+    for (y = 0; y < 576; y++) {
+	for (x = 0; x < 96; x++) *ptr++ = 0xffffff;	/* white */
+	for (x = 0; x < 96; x++) *ptr++ = 0xffff00;	/* yellow */
+	for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;	/* cyan */
+	for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;	/* green */
+	for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;	/* magenta */
+	for (x = 0; x < 96; x++) *ptr++ = 0xff0000;	/* red */
+	for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;	/* blue */
+	for (x = 0; x < 96; x++) *ptr++ = 0x000000;	/* black */
+    }
+    fm2fbcon_blank(0, NULL);
+
+    if (fm2fb_mode == -1)
+	fm2fb_mode = FM2FB_MODE_PAL;
+
+    fb_var = fb_var_modes[fm2fb_mode];
+
+    strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II");
+    fb_fix.smem_start = (char *)fm2fb_mem_phys;
+    fb_fix.smem_len = FRAMEMASTER_REG;
+    fb_fix.type = FB_TYPE_PACKED_PIXELS;
+    fb_fix.type_aux = 0;
+    fb_fix.visual = FB_VISUAL_TRUECOLOR;
+    fb_fix.line_length = 768<<2;
+    fb_fix.mmio_start = (char *)fm2fb_reg_phys;
+    fb_fix.mmio_len = 8;
+    fb_fix.accel = FB_ACCEL_NONE;
+
+    disp.var = fb_var;
+    disp.cmap.start = 0;
+    disp.cmap.len = 0;
+    disp.cmap.red = disp.cmap.green = disp.cmap.blue = disp.cmap.transp = NULL;
+    disp.screen_base = (char *)fm2fb_mem;
+    disp.visual = fb_fix.visual;
+    disp.type = fb_fix.type;
+    disp.type_aux = fb_fix.type_aux;
+    disp.ypanstep = 0;
+    disp.ywrapstep = 0;
+    disp.line_length = fb_fix.line_length;
+    disp.can_soft_blank = 1;
+    disp.inverse = 0;
+#ifdef FBCON_HAS_CFB32
+    disp.dispsw = &fbcon_cfb32;
+    disp.dispsw_data = &fbcon_cfb32_cmap;
+#else
+    disp.dispsw = &fbcon_dummy;
+#endif
+    disp.scrollmode = SCROLL_YREDRAW;
+
+    strcpy(fb_info.modename, fb_fix.id);
+    fb_info.node = -1;
+    fb_info.fbops = &fm2fb_ops;
+    fb_info.disp = &disp;
+    fb_info.fontname[0] = '\0';
+    fb_info.changevar = NULL;
+    fb_info.switch_con = &fm2fbcon_switch;
+    fb_info.updatevar = &fm2fbcon_updatevar;
+    fb_info.blank = &fm2fbcon_blank;
+    fb_info.flags = FBINFO_FLAG_DEFAULT;
+
+    fm2fb_set_var(&fb_var, -1, &fb_info);
+
+    if (register_framebuffer(&fb_info) < 0)
+	return;
+
+    printk("fb%d: %s frame buffer device\n", GET_FB_IDX(fb_info.node),
+	   fb_fix.id);
+}
+
+__initfunc(void fm2fb_setup(char *options, int *ints))
+{
+    char *this_opt;
+
+    if (!options || !*options)
+	return;
+
+    for (this_opt = strtok(options, ","); this_opt;
+	 this_opt = strtok(NULL, ",")) {
+	if (!strncmp(this_opt, "pal", 3))
+	    fm2fb_mode = FM2FB_MODE_PAL;
+	else if (!strncmp(this_opt, "ntsc", 4))
+	    fm2fb_mode = FM2FB_MODE_NTSC;
+    }
+}
+
+
+static int fm2fbcon_switch(int con, struct fb_info *info)
+{
+    /* Do we have to save the colormap? */
+    if (fb_display[currcon].cmap.len)
+	fb_get_cmap(&fb_display[currcon].cmap, 1, fm2fb_getcolreg, info);
+
+    currcon = con;
+    /* Install new colormap */
+    do_install_cmap(con, info);
+    return 0;
+}
+
+    /*
+     *  Update the `var' structure (called by fbcon.c)
+     */
+
+static int fm2fbcon_updatevar(int con, struct fb_info *info)
+{
+    /* Nothing */
+    return 0;
+}
+
+    /*
+     *  Blank the display.
+     */
+
+static void fm2fbcon_blank(int blank, struct fb_info *info)
+{
+    unsigned char t = FRAMEMASTER_ROM;
+
+    if (!blank)
+	t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE;
+    fm2fb_reg[0] = t;
+}
+
+    /*
+     *  Read a single color register and split it into
+     *  colors/transparent. Return != 0 for invalid regno.
+     */
+
+static int fm2fb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
+                         u_int *transp, struct fb_info *info)
+{
+    if (regno > 15)
+	return 1;
+    *red = (palette[regno].red<<8) | palette[regno].red;
+    *green = (palette[regno].green<<8) | palette[regno].green;
+    *blue = (palette[regno].blue<<8) | palette[regno].blue;
+    *transp = 0;
+    return 0;
+}
+
+
+    /*
+     *  Set a single color register. The values supplied are already
+     *  rounded down to the hardware's capabilities (according to the
+     *  entries in the var structure). Return != 0 for invalid regno.
+     */
+
+static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                         u_int transp, struct fb_info *info)
+{
+    if (regno > 15)
+	return 1;
+    red >>= 8;
+    green >>= 8;
+    blue >>= 8;
+    palette[regno].red = red;
+    palette[regno].green = green;
+    palette[regno].blue = blue;
+
+#ifdef FBCON_HAS_CFB32
+    fbcon_cfb32_cmap[regno] = (red << 16) | (green << 8) | blue;
+#endif
+    return 0;
+}
+
+
+static void do_install_cmap(int con, struct fb_info *info)
+{
+    if (con != currcon)
+	return;
+    if (fb_display[con].cmap.len)
+	fb_set_cmap(&fb_display[con].cmap, 1, fm2fb_setcolreg, info);
+    else
+	fb_set_cmap(fb_default_cmap(256), 1, fm2fb_setcolreg, info);
+}