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323 lines
9.0 KiB
323 lines
9.0 KiB
/* |
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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 ([email protected]) |
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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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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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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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