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Diffstat (limited to 'drivers/video/fbdev/fm2fb.c')
| -rw-r--r-- | drivers/video/fbdev/fm2fb.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/video/fbdev/fm2fb.c b/drivers/video/fbdev/fm2fb.c new file mode 100644 index 000000000..3b727d528 --- /dev/null +++ b/drivers/video/fbdev/fm2fb.c @@ -0,0 +1,323 @@ +/* + * linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer + * device + * + * Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de) + * Copyright (C) 1999 Geert Uytterhoeven + * + * Written for 2.0.x by Steffen A. Mork + * Ported to 2.1.x by Geert Uytterhoeven + * Ported to new api by James Simmons + * + * 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> + +/* + * 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. Unfortunately 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 + +static volatile unsigned char *fm2fb_reg; + +static struct fb_fix_screeninfo fb_fix = { + .smem_len = FRAMEMASTER_REG, + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_TRUECOLOR, + .line_length = (768 << 2), + .mmio_len = (8), + .accel = FB_ACCEL_NONE, +}; + +static int fm2fb_mode = -1; + +#define FM2FB_MODE_PAL 0 +#define FM2FB_MODE_NTSC 1 + +static struct fb_var_screeninfo fb_var_modes[] = { + { + /* 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_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info); +static int fm2fb_blank(int blank, struct fb_info *info); + +static const struct fb_ops fm2fb_ops = { + .owner = THIS_MODULE, + .fb_setcolreg = fm2fb_setcolreg, + .fb_blank = fm2fb_blank, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + + /* + * Blank the display. + */ +static int fm2fb_blank(int blank, struct fb_info *info) +{ + unsigned char t = FRAMEMASTER_ROM; + + if (!blank) + t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE; + fm2fb_reg[0] = t; + 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 < 16) { + red >>= 8; + green >>= 8; + blue >>= 8; + + ((u32*)(info->pseudo_palette))[regno] = (red << 16) | + (green << 8) | blue; + } + + return 0; +} + + /* + * Initialisation + */ + +static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id); + +static const struct zorro_device_id fm2fb_devices[] = { + { ZORRO_PROD_BSC_FRAMEMASTER_II }, + { ZORRO_PROD_HELFRICH_RAINBOW_II }, + { 0 } +}; +MODULE_DEVICE_TABLE(zorro, fm2fb_devices); + +static struct zorro_driver fm2fb_driver = { + .name = "fm2fb", + .id_table = fm2fb_devices, + .probe = fm2fb_probe, +}; + +static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id) +{ + struct fb_info *info; + unsigned long *ptr; + int is_fm; + int x, y; + + is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II; + + if (!zorro_request_device(z,"fm2fb")) + return -ENXIO; + + info = framebuffer_alloc(16 * sizeof(u32), &z->dev); + if (!info) { + zorro_release_device(z); + return -ENOMEM; + } + + if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { + framebuffer_release(info); + zorro_release_device(z); + return -ENOMEM; + } + + /* assigning memory to kernel space */ + fb_fix.smem_start = zorro_resource_start(z); + info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE); + fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG; + fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG); + + strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II"); + + /* make EBU color bars on display */ + ptr = (unsigned long *)fb_fix.smem_start; + 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 */ + } + fm2fb_blank(0, info); + + if (fm2fb_mode == -1) + fm2fb_mode = FM2FB_MODE_PAL; + + info->fbops = &fm2fb_ops; + info->var = fb_var_modes[fm2fb_mode]; + info->pseudo_palette = info->par; + info->par = NULL; + info->fix = fb_fix; + info->flags = FBINFO_DEFAULT; + + if (register_framebuffer(info) < 0) { + fb_dealloc_cmap(&info->cmap); + iounmap(info->screen_base); + framebuffer_release(info); + zorro_release_device(z); + return -EINVAL; + } + fb_info(info, "%s frame buffer device\n", fb_fix.id); + return 0; +} + +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; +} + +int __init fm2fb_init(void) +{ + char *option = NULL; + + if (fb_get_options("fm2fb", &option)) + return -ENODEV; + fm2fb_setup(option); + return zorro_register_driver(&fm2fb_driver); +} + +module_init(fm2fb_init); +MODULE_LICENSE("GPL"); |