324 lines
9.1 KiB
C
324 lines
9.1 KiB
C
/*
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* linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer
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* device
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*
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* Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de)
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* Copyright (C) 1999 Geert Uytterhoeven
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*
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* Written for 2.0.x by Steffen A. Mork
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* Ported to 2.1.x by Geert Uytterhoeven
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* Ported to new api by James Simmons
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/zorro.h>
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#include <asm/io.h>
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/*
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* Some technical notes:
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*
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* The BSC FrameMaster II (or Rainbow II) is a simple very dumb
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* frame buffer which allows to display 24 bit true color images.
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* Each pixel is 32 bit width so it's very easy to maintain the
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* frame buffer. One long word has the following layout:
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* AARRGGBB which means: AA the alpha channel byte, RR the red
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* channel, GG the green channel and BB the blue channel.
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*
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* The FrameMaster II supports the following video modes.
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* - PAL/NTSC
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* - interlaced/non interlaced
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* - composite sync/sync/sync over green
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*
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* The resolution is to the following both ones:
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* - 768x576 (PAL)
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* - 768x480 (NTSC)
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*
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* This means that pixel access per line is fixed due to the
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* fixed line width. In case of maximal resolution the frame
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* buffer needs an amount of memory of 1.769.472 bytes which
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* is near to 2 MByte (the allocated address space of Zorro2).
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* The memory is channel interleaved. That means every channel
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* owns four VRAMs. Unfortunately most FrameMasters II are
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* not assembled with memory for the alpha channel. In this
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* case it could be possible to add the frame buffer into the
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* normal memory pool.
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*
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* At relative address 0x1ffff8 of the frame buffers base address
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* there exists a control register with the number of
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* four control bits. They have the following meaning:
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* bit value meaning
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*
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* 0 1 0=interlaced/1=non interlaced
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* 1 2 0=video out disabled/1=video out enabled
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* 2 4 0=normal mode as jumpered via JP8/1=complement mode
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* 3 8 0=read onboard ROM/1 normal operation (required)
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*
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* As mentioned above there are several jumper. I think there
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* is not very much information about the FrameMaster II in
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* the world so I add these information for completeness.
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*
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* JP1 interlace selection (1-2 non interlaced/2-3 interlaced)
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* JP2 wait state creation (leave as is!)
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* JP3 wait state creation (leave as is!)
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* JP4 modulate composite sync on green output (1-2 composite
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* sync on green channel/2-3 normal composite sync)
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* JP5 create test signal, shorting this jumper will create
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* a white screen
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* JP6 sync creation (1-2 composite sync/2-3 H-sync output)
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* JP8 video mode (1-2 PAL/2-3 NTSC)
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*
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* With the following jumpering table you can connect the
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* FrameMaster II to a normal TV via SCART connector:
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* JP1: 2-3
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* JP4: 2-3
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* JP6: 2-3
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* JP8: 1-2 (means PAL for Europe)
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*
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* NOTE:
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* There is no other possibility to change the video timings
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* except the interlaced/non interlaced, sync control and the
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* video mode PAL (50 Hz)/NTSC (60 Hz). Inside this
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* FrameMaster II driver are assumed values to avoid anomalies
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* to a future X server. Except the pixel clock is really
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* constant at 30 MHz.
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*
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* 9 pin female video connector:
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*
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* 1 analog red 0.7 Vss
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* 2 analog green 0.7 Vss
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* 3 analog blue 0.7 Vss
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* 4 H-sync TTL
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* 5 V-sync TTL
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* 6 ground
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* 7 ground
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* 8 ground
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* 9 ground
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*
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* Some performance notes:
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* The FrameMaster II was not designed to display a console
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* this driver would do! It was designed to display still true
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* color images. Imagine: When scroll up a text line there
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* must copied ca. 1.7 MBytes to another place inside this
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* frame buffer. This means 1.7 MByte read and 1.7 MByte write
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* over the slow 16 bit wide Zorro2 bus! A scroll of one
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* line needs 1 second so do not expect to much from this
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* driver - he is at the limit!
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*
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*/
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/*
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* definitions
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*/
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#define FRAMEMASTER_SIZE 0x200000
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#define FRAMEMASTER_REG 0x1ffff8
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#define FRAMEMASTER_NOLACE 1
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#define FRAMEMASTER_ENABLE 2
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#define FRAMEMASTER_COMPL 4
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#define FRAMEMASTER_ROM 8
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static volatile unsigned char *fm2fb_reg;
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static struct fb_fix_screeninfo fb_fix = {
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.smem_len = FRAMEMASTER_REG,
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_TRUECOLOR,
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.line_length = (768 << 2),
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.mmio_len = (8),
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.accel = FB_ACCEL_NONE,
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};
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static int fm2fb_mode = -1;
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#define FM2FB_MODE_PAL 0
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#define FM2FB_MODE_NTSC 1
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static struct fb_var_screeninfo fb_var_modes[] = {
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{
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/* 768 x 576, 32 bpp (PAL) */
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768, 576, 768, 576, 0, 0, 32, 0,
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{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
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0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
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33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
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}, {
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/* 768 x 480, 32 bpp (NTSC - not supported yet */
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768, 480, 768, 480, 0, 0, 32, 0,
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{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
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0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
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33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
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}
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};
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/*
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* Interface used by the world
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*/
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static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
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u_int transp, struct fb_info *info);
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static int fm2fb_blank(int blank, struct fb_info *info);
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static const struct fb_ops fm2fb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = fm2fb_setcolreg,
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.fb_blank = fm2fb_blank,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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/*
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* Blank the display.
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*/
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static int fm2fb_blank(int blank, struct fb_info *info)
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{
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unsigned char t = FRAMEMASTER_ROM;
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if (!blank)
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t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE;
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fm2fb_reg[0] = t;
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return 0;
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}
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/*
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* Set a single color register. The values supplied are already
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* rounded down to the hardware's capabilities (according to the
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* entries in the var structure). Return != 0 for invalid regno.
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*/
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static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
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u_int transp, struct fb_info *info)
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{
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if (regno < 16) {
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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((u32*)(info->pseudo_palette))[regno] = (red << 16) |
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(green << 8) | blue;
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}
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return 0;
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}
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/*
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* Initialisation
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*/
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static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id);
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static const struct zorro_device_id fm2fb_devices[] = {
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{ ZORRO_PROD_BSC_FRAMEMASTER_II },
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{ ZORRO_PROD_HELFRICH_RAINBOW_II },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(zorro, fm2fb_devices);
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static struct zorro_driver fm2fb_driver = {
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.name = "fm2fb",
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.id_table = fm2fb_devices,
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.probe = fm2fb_probe,
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};
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static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id)
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{
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struct fb_info *info;
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unsigned long *ptr;
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int is_fm;
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int x, y;
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is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II;
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if (!zorro_request_device(z,"fm2fb"))
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return -ENXIO;
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info = framebuffer_alloc(16 * sizeof(u32), &z->dev);
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if (!info) {
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zorro_release_device(z);
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return -ENOMEM;
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}
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if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
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framebuffer_release(info);
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zorro_release_device(z);
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return -ENOMEM;
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}
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/* assigning memory to kernel space */
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fb_fix.smem_start = zorro_resource_start(z);
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info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE);
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fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG;
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fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG);
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strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II");
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/* make EBU color bars on display */
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ptr = (unsigned long *)fb_fix.smem_start;
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for (y = 0; y < 576; y++) {
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for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */
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for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */
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for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */
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for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */
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for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */
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for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */
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for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */
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for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */
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}
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fm2fb_blank(0, info);
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if (fm2fb_mode == -1)
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fm2fb_mode = FM2FB_MODE_PAL;
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info->fbops = &fm2fb_ops;
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info->var = fb_var_modes[fm2fb_mode];
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info->pseudo_palette = info->par;
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info->par = NULL;
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info->fix = fb_fix;
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info->flags = FBINFO_DEFAULT;
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if (register_framebuffer(info) < 0) {
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fb_dealloc_cmap(&info->cmap);
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iounmap(info->screen_base);
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framebuffer_release(info);
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zorro_release_device(z);
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return -EINVAL;
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}
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fb_info(info, "%s frame buffer device\n", fb_fix.id);
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return 0;
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}
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static int __init fm2fb_setup(char *options)
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{
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char *this_opt;
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if (!options || !*options)
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return 0;
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while ((this_opt = strsep(&options, ",")) != NULL) {
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if (!strncmp(this_opt, "pal", 3))
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fm2fb_mode = FM2FB_MODE_PAL;
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else if (!strncmp(this_opt, "ntsc", 4))
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fm2fb_mode = FM2FB_MODE_NTSC;
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}
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return 0;
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}
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static int __init fm2fb_init(void)
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{
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char *option = NULL;
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if (fb_get_options("fm2fb", &option))
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return -ENODEV;
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fm2fb_setup(option);
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return zorro_register_driver(&fm2fb_driver);
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}
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module_init(fm2fb_init);
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MODULE_LICENSE("GPL");
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