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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] = '\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 device\n", 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");