fm2fb.c
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上传日期:2013-02-24
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- /*
- * 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;
- 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_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_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);
- /*
- * Interface to the low level console driver
- */
- int 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 = {
- owner: THIS_MODULE,
- fb_get_fix: fm2fb_get_fix,
- fb_get_var: fm2fb_get_var,
- fb_set_var: fm2fb_set_var,
- fb_get_cmap: fm2fb_get_cmap,
- fb_set_cmap: fm2fb_set_cmap,
- };
- /*
- * 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;
- }
- /*
- * 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;
- }
- /*
- * Initialisation
- */
- int __init fm2fb_init(void)
- {
- int is_fm;
- struct zorro_dev *z = NULL;
- unsigned long *ptr;
- int x, y;
- while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
- if (z->id == ZORRO_PROD_BSC_FRAMEMASTER_II)
- is_fm = 1;
- else if (z->id == ZORRO_PROD_HELFRICH_RAINBOW_II)
- is_fm = 0;
- else
- continue;
- if (!request_mem_region(z->resource.start, FRAMEMASTER_SIZE, "fm2fb"))
- continue;
- /* assigning memory to kernel space */
- fm2fb_mem_phys = z->resource.start;
- fm2fb_mem = ioremap(fm2fb_mem_phys, 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 = 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 = 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] = ' ';
- 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 -EINVAL;
- printk("fb%d: %s frame buffer devicen", GET_FB_IDX(fb_info.node),
- fb_fix.id);
- return 0;
- }
- return -ENXIO;
- }
- int __init fm2fb_setup(char *options)
- {
- char *this_opt;
- if (!options || !*options)
- return 0;
- while ((this_opt = strsep(&options, ",")) != NULL) {
- if (!strncmp(this_opt, "pal", 3))
- fm2fb_mode = FM2FB_MODE_PAL;
- else if (!strncmp(this_opt, "ntsc", 4))
- fm2fb_mode = FM2FB_MODE_NTSC;
- }
- return 0;
- }
- 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);
- }
- MODULE_LICENSE("GPL");