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1/*2 * linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer3 * device4 *5 * Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de)6 * Copyright (C) 1999 Geert Uytterhoeven7 *8 * Written for 2.0.x by Steffen A. Mork9 * Ported to 2.1.x by Geert Uytterhoeven10 * Ported to new api by James Simmons11 *12 * This file is subject to the terms and conditions of the GNU General Public13 * License. See the file COPYING in the main directory of this archive for14 * more details.15 */16 17#include <linux/module.h>18#include <linux/mm.h>19#include <linux/fb.h>20#include <linux/init.h>21#include <linux/zorro.h>22#include <asm/io.h>23 24/*25 * Some technical notes:26 *27 * The BSC FrameMaster II (or Rainbow II) is a simple very dumb28 * frame buffer which allows to display 24 bit true color images.29 * Each pixel is 32 bit width so it's very easy to maintain the30 * frame buffer. One long word has the following layout:31 * AARRGGBB which means: AA the alpha channel byte, RR the red32 * channel, GG the green channel and BB the blue channel.33 *34 * The FrameMaster II supports the following video modes.35 * - PAL/NTSC36 * - interlaced/non interlaced37 * - composite sync/sync/sync over green38 *39 * The resolution is to the following both ones:40 * - 768x576 (PAL)41 * - 768x480 (NTSC)42 *43 * This means that pixel access per line is fixed due to the44 * fixed line width. In case of maximal resolution the frame45 * buffer needs an amount of memory of 1.769.472 bytes which46 * is near to 2 MByte (the allocated address space of Zorro2).47 * The memory is channel interleaved. That means every channel48 * owns four VRAMs. Unfortunately most FrameMasters II are49 * not assembled with memory for the alpha channel. In this50 * case it could be possible to add the frame buffer into the51 * normal memory pool.52 *53 * At relative address 0x1ffff8 of the frame buffers base address54 * there exists a control register with the number of55 * four control bits. They have the following meaning:56 * bit value meaning57 *58 * 0 1 0=interlaced/1=non interlaced59 * 1 2 0=video out disabled/1=video out enabled60 * 2 4 0=normal mode as jumpered via JP8/1=complement mode61 * 3 8 0=read onboard ROM/1 normal operation (required)62 *63 * As mentioned above there are several jumper. I think there64 * is not very much information about the FrameMaster II in65 * the world so I add these information for completeness.66 *67 * JP1 interlace selection (1-2 non interlaced/2-3 interlaced)68 * JP2 wait state creation (leave as is!)69 * JP3 wait state creation (leave as is!)70 * JP4 modulate composite sync on green output (1-2 composite71 * sync on green channel/2-3 normal composite sync)72 * JP5 create test signal, shorting this jumper will create73 * a white screen74 * JP6 sync creation (1-2 composite sync/2-3 H-sync output)75 * JP8 video mode (1-2 PAL/2-3 NTSC)76 *77 * With the following jumpering table you can connect the78 * FrameMaster II to a normal TV via SCART connector:79 * JP1: 2-380 * JP4: 2-381 * JP6: 2-382 * JP8: 1-2 (means PAL for Europe)83 *84 * NOTE:85 * There is no other possibility to change the video timings86 * except the interlaced/non interlaced, sync control and the87 * video mode PAL (50 Hz)/NTSC (60 Hz). Inside this88 * FrameMaster II driver are assumed values to avoid anomalies89 * to a future X server. Except the pixel clock is really90 * constant at 30 MHz.91 *92 * 9 pin female video connector:93 *94 * 1 analog red 0.7 Vss95 * 2 analog green 0.7 Vss96 * 3 analog blue 0.7 Vss97 * 4 H-sync TTL98 * 5 V-sync TTL99 * 6 ground100 * 7 ground101 * 8 ground102 * 9 ground103 *104 * Some performance notes:105 * The FrameMaster II was not designed to display a console106 * this driver would do! It was designed to display still true107 * color images. Imagine: When scroll up a text line there108 * must copied ca. 1.7 MBytes to another place inside this109 * frame buffer. This means 1.7 MByte read and 1.7 MByte write110 * over the slow 16 bit wide Zorro2 bus! A scroll of one111 * line needs 1 second so do not expect to much from this112 * driver - he is at the limit!113 *114 */115 116/*117 * definitions118 */119 120#define FRAMEMASTER_SIZE 0x200000121#define FRAMEMASTER_REG 0x1ffff8122 123#define FRAMEMASTER_NOLACE 1124#define FRAMEMASTER_ENABLE 2125#define FRAMEMASTER_COMPL 4126#define FRAMEMASTER_ROM 8127 128static volatile unsigned char *fm2fb_reg;129 130static struct fb_fix_screeninfo fb_fix = {131 .smem_len = FRAMEMASTER_REG,132 .type = FB_TYPE_PACKED_PIXELS,133 .visual = FB_VISUAL_TRUECOLOR,134 .line_length = (768 << 2),135 .mmio_len = (8),136 .accel = FB_ACCEL_NONE,137};138 139static int fm2fb_mode = -1;140 141#define FM2FB_MODE_PAL 0142#define FM2FB_MODE_NTSC 1143 144static struct fb_var_screeninfo fb_var_modes[] = {145 {146 /* 768 x 576, 32 bpp (PAL) */147 768, 576, 768, 576, 0, 0, 32, 0,148 { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },149 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,150 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0151 }, {152 /* 768 x 480, 32 bpp (NTSC - not supported yet */153 768, 480, 768, 480, 0, 0, 32, 0,154 { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },155 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,156 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0157 }158};159 160 /*161 * Interface used by the world162 */163 164static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,165 u_int transp, struct fb_info *info);166static int fm2fb_blank(int blank, struct fb_info *info);167 168static const struct fb_ops fm2fb_ops = {169 .owner = THIS_MODULE,170 FB_DEFAULT_IOMEM_OPS,171 .fb_setcolreg = fm2fb_setcolreg,172 .fb_blank = fm2fb_blank,173};174 175 /*176 * Blank the display.177 */178static int fm2fb_blank(int blank, struct fb_info *info)179{180 unsigned char t = FRAMEMASTER_ROM;181 182 if (!blank)183 t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE;184 fm2fb_reg[0] = t;185 return 0;186}187 188 /*189 * Set a single color register. The values supplied are already190 * rounded down to the hardware's capabilities (according to the191 * entries in the var structure). Return != 0 for invalid regno.192 */193static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,194 u_int transp, struct fb_info *info)195{196 if (regno < 16) {197 red >>= 8;198 green >>= 8;199 blue >>= 8;200 201 ((u32*)(info->pseudo_palette))[regno] = (red << 16) |202 (green << 8) | blue;203 }204 205 return 0;206}207 208 /*209 * Initialisation210 */211 212static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id);213 214static const struct zorro_device_id fm2fb_devices[] = {215 { ZORRO_PROD_BSC_FRAMEMASTER_II },216 { ZORRO_PROD_HELFRICH_RAINBOW_II },217 { 0 }218};219MODULE_DEVICE_TABLE(zorro, fm2fb_devices);220 221static struct zorro_driver fm2fb_driver = {222 .name = "fm2fb",223 .id_table = fm2fb_devices,224 .probe = fm2fb_probe,225};226 227static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id)228{229 struct fb_info *info;230 unsigned long *ptr;231 int is_fm;232 int x, y;233 234 is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II;235 236 if (!zorro_request_device(z,"fm2fb"))237 return -ENXIO;238 239 info = framebuffer_alloc(16 * sizeof(u32), &z->dev);240 if (!info) {241 zorro_release_device(z);242 return -ENOMEM;243 }244 245 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {246 framebuffer_release(info);247 zorro_release_device(z);248 return -ENOMEM;249 }250 251 /* assigning memory to kernel space */252 fb_fix.smem_start = zorro_resource_start(z);253 info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE);254 fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG;255 fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG);256 257 strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II");258 259 /* make EBU color bars on display */260 ptr = (unsigned long *)fb_fix.smem_start;261 for (y = 0; y < 576; y++) {262 for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */263 for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */264 for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */265 for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */266 for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */267 for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */268 for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */269 for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */270 }271 fm2fb_blank(0, info);272 273 if (fm2fb_mode == -1)274 fm2fb_mode = FM2FB_MODE_PAL;275 276 info->fbops = &fm2fb_ops;277 info->var = fb_var_modes[fm2fb_mode];278 info->pseudo_palette = info->par;279 info->par = NULL;280 info->fix = fb_fix;281 282 if (register_framebuffer(info) < 0) {283 fb_dealloc_cmap(&info->cmap);284 iounmap(info->screen_base);285 framebuffer_release(info);286 zorro_release_device(z);287 return -EINVAL;288 }289 fb_info(info, "%s frame buffer device\n", fb_fix.id);290 return 0;291}292 293static int __init fm2fb_setup(char *options)294{295 char *this_opt;296 297 if (!options || !*options)298 return 0;299 300 while ((this_opt = strsep(&options, ",")) != NULL) {301 if (!strncmp(this_opt, "pal", 3))302 fm2fb_mode = FM2FB_MODE_PAL;303 else if (!strncmp(this_opt, "ntsc", 4))304 fm2fb_mode = FM2FB_MODE_NTSC;305 }306 return 0;307}308 309static int __init fm2fb_init(void)310{311 char *option = NULL;312 313 if (fb_get_options("fm2fb", &option))314 return -ENODEV;315 fm2fb_setup(option);316 return zorro_register_driver(&fm2fb_driver);317}318 319module_init(fm2fb_init);320MODULE_LICENSE("GPL");321