Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * drivers/video/geode/gx1fb_core.c |
| 3 | * -- Geode GX1 framebuffer driver |
| 4 | * |
| 5 | * Copyright (C) 2005 Arcom Control Systems Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/tty.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/fb.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/pci.h> |
| 24 | |
| 25 | #include "geodefb.h" |
| 26 | #include "display_gx1.h" |
| 27 | #include "video_cs5530.h" |
| 28 | |
| 29 | static char mode_option[32] = "640x480-16@60"; |
| 30 | static int crt_option = 1; |
| 31 | static char panel_option[32] = ""; |
| 32 | |
| 33 | static int gx1_line_delta(int xres, int bpp) |
| 34 | { |
| 35 | int line_delta = xres * (bpp >> 3); |
| 36 | |
| 37 | if (line_delta > 2048) |
| 38 | line_delta = 4096; |
| 39 | else if (line_delta > 1024) |
| 40 | line_delta = 2048; |
| 41 | else |
| 42 | line_delta = 1024; |
| 43 | return line_delta; |
| 44 | } |
| 45 | |
| 46 | static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) |
| 47 | { |
| 48 | struct geodefb_par *par = info->par; |
| 49 | |
| 50 | printk(KERN_DEBUG "%s()\n", __FUNCTION__); |
| 51 | |
| 52 | /* Maximum resolution is 1280x1024. */ |
| 53 | if (var->xres > 1280 || var->yres > 1024) |
| 54 | return -EINVAL; |
| 55 | |
| 56 | if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y)) |
| 57 | return -EINVAL; |
| 58 | |
| 59 | /* Only 16 bpp and 8 bpp is supported by the hardware. */ |
| 60 | if (var->bits_per_pixel == 16) { |
| 61 | var->red.offset = 11; var->red.length = 5; |
| 62 | var->green.offset = 5; var->green.length = 6; |
| 63 | var->blue.offset = 0; var->blue.length = 5; |
| 64 | var->transp.offset = 0; var->transp.length = 0; |
| 65 | } else if (var->bits_per_pixel == 8) { |
| 66 | var->red.offset = 0; var->red.length = 8; |
| 67 | var->green.offset = 0; var->green.length = 8; |
| 68 | var->blue.offset = 0; var->blue.length = 8; |
| 69 | var->transp.offset = 0; var->transp.length = 0; |
| 70 | } else |
| 71 | return -EINVAL; |
| 72 | |
| 73 | /* Enough video memory? */ |
| 74 | if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len) |
| 75 | return -EINVAL; |
| 76 | |
| 77 | /* FIXME: Check timing parameters here? */ |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | static int gx1fb_set_par(struct fb_info *info) |
| 83 | { |
| 84 | struct geodefb_par *par = info->par; |
| 85 | |
| 86 | if (info->var.bits_per_pixel == 16) { |
| 87 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
| 88 | fb_dealloc_cmap(&info->cmap); |
| 89 | } else { |
| 90 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
| 91 | fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0); |
| 92 | } |
| 93 | |
| 94 | info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel); |
| 95 | |
| 96 | par->dc_ops->set_mode(info); |
| 97 | |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) |
| 102 | { |
| 103 | chan &= 0xffff; |
| 104 | chan >>= 16 - bf->length; |
| 105 | return chan << bf->offset; |
| 106 | } |
| 107 | |
| 108 | static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green, |
| 109 | unsigned blue, unsigned transp, |
| 110 | struct fb_info *info) |
| 111 | { |
| 112 | struct geodefb_par *par = info->par; |
| 113 | |
| 114 | if (info->var.grayscale) { |
| 115 | /* grayscale = 0.30*R + 0.59*G + 0.11*B */ |
| 116 | red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; |
| 117 | } |
| 118 | |
| 119 | /* Truecolor has hardware independent palette */ |
| 120 | if (info->fix.visual == FB_VISUAL_TRUECOLOR) { |
| 121 | u32 *pal = info->pseudo_palette; |
| 122 | u32 v; |
| 123 | |
| 124 | if (regno >= 16) |
| 125 | return -EINVAL; |
| 126 | |
| 127 | v = chan_to_field(red, &info->var.red); |
| 128 | v |= chan_to_field(green, &info->var.green); |
| 129 | v |= chan_to_field(blue, &info->var.blue); |
| 130 | |
| 131 | pal[regno] = v; |
| 132 | } else { |
| 133 | if (regno >= 256) |
| 134 | return -EINVAL; |
| 135 | |
| 136 | par->dc_ops->set_palette_reg(info, regno, red, green, blue); |
| 137 | } |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int gx1fb_blank(int blank_mode, struct fb_info *info) |
| 143 | { |
| 144 | struct geodefb_par *par = info->par; |
| 145 | |
| 146 | return par->vid_ops->blank_display(info, blank_mode); |
| 147 | } |
| 148 | |
| 149 | static int __init gx1fb_map_video_memory(struct fb_info *info) |
| 150 | { |
| 151 | struct geodefb_par *par = info->par; |
| 152 | unsigned gx_base; |
| 153 | int fb_len; |
| 154 | |
| 155 | gx_base = gx1_gx_base(); |
| 156 | if (!gx_base) |
| 157 | return -ENODEV; |
| 158 | |
| 159 | par->vid_dev = pci_get_device(PCI_VENDOR_ID_CYRIX, |
| 160 | PCI_DEVICE_ID_CYRIX_5530_VIDEO, NULL); |
| 161 | if (!par->vid_dev) |
| 162 | return -ENODEV; |
| 163 | |
| 164 | par->vid_regs = ioremap(pci_resource_start(par->vid_dev, 1), |
| 165 | pci_resource_len(par->vid_dev, 1)); |
| 166 | if (!par->vid_regs) |
| 167 | return -ENOMEM; |
| 168 | |
| 169 | par->dc_regs = ioremap(gx_base + 0x8300, 0x100); |
| 170 | if (!par->dc_regs) |
| 171 | return -ENOMEM; |
| 172 | |
| 173 | info->fix.smem_start = gx_base + 0x800000; |
| 174 | if ((fb_len = gx1_frame_buffer_size()) < 0) |
| 175 | return -ENOMEM; |
| 176 | info->fix.smem_len = fb_len; |
| 177 | info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); |
| 178 | if (!info->screen_base) |
| 179 | return -ENOMEM; |
| 180 | |
| 181 | printk(KERN_INFO "%s: %d Kibyte of video memory at 0x%lx\n", |
| 182 | info->fix.id, info->fix.smem_len / 1024, info->fix.smem_start); |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static int parse_panel_option(struct fb_info *info) |
| 188 | { |
| 189 | struct geodefb_par *par = info->par; |
| 190 | |
| 191 | if (strcmp(panel_option, "") != 0) { |
| 192 | int x, y; |
| 193 | char *s; |
| 194 | x = simple_strtol(panel_option, &s, 10); |
| 195 | if (!x) |
| 196 | return -EINVAL; |
| 197 | y = simple_strtol(s + 1, NULL, 10); |
| 198 | if (!y) |
| 199 | return -EINVAL; |
| 200 | par->panel_x = x; |
| 201 | par->panel_y = y; |
| 202 | } |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static struct fb_ops gx1fb_ops = { |
| 207 | .owner = THIS_MODULE, |
| 208 | .fb_check_var = gx1fb_check_var, |
| 209 | .fb_set_par = gx1fb_set_par, |
| 210 | .fb_setcolreg = gx1fb_setcolreg, |
| 211 | .fb_blank = gx1fb_blank, |
| 212 | /* No HW acceleration for now. */ |
| 213 | .fb_fillrect = cfb_fillrect, |
| 214 | .fb_copyarea = cfb_copyarea, |
| 215 | .fb_imageblit = cfb_imageblit, |
| 216 | .fb_cursor = soft_cursor, |
| 217 | }; |
| 218 | |
| 219 | static struct fb_info * __init gx1fb_init_fbinfo(void) |
| 220 | { |
| 221 | struct fb_info *info; |
| 222 | struct geodefb_par *par; |
| 223 | |
| 224 | /* Alloc enough space for the pseudo palette. */ |
| 225 | info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, NULL); |
| 226 | if (!info) |
| 227 | return NULL; |
| 228 | |
| 229 | par = info->par; |
| 230 | |
| 231 | strcpy(info->fix.id, "GX1"); |
| 232 | |
| 233 | info->fix.type = FB_TYPE_PACKED_PIXELS; |
| 234 | info->fix.type_aux = 0; |
| 235 | info->fix.xpanstep = 0; |
| 236 | info->fix.ypanstep = 0; |
| 237 | info->fix.ywrapstep = 0; |
| 238 | info->fix.accel = FB_ACCEL_NONE; |
| 239 | |
| 240 | info->var.nonstd = 0; |
| 241 | info->var.activate = FB_ACTIVATE_NOW; |
| 242 | info->var.height = -1; |
| 243 | info->var.width = -1; |
| 244 | info->var.accel_flags = 0; |
| 245 | info->var.vmode = FB_VMODE_NONINTERLACED; |
| 246 | |
| 247 | info->fbops = &gx1fb_ops; |
| 248 | info->flags = FBINFO_DEFAULT; |
| 249 | info->node = -1; |
| 250 | |
| 251 | info->pseudo_palette = (void *)par + sizeof(struct geodefb_par); |
| 252 | |
| 253 | info->var.grayscale = 0; |
| 254 | |
| 255 | /* CRT and panel options */ |
| 256 | par->enable_crt = crt_option; |
| 257 | if (parse_panel_option(info) < 0) |
| 258 | printk(KERN_WARNING "%s: invalid 'panel' option -- disabling flat panel\n", |
| 259 | info->fix.id); |
| 260 | if (!par->panel_x) |
| 261 | par->enable_crt = 1; /* fall back to CRT if no panel is specified */ |
| 262 | |
| 263 | return info; |
| 264 | } |
| 265 | |
| 266 | |
| 267 | static struct fb_info *gx1fb_info; |
| 268 | |
| 269 | static int __init gx1fb_init(void) |
| 270 | { |
| 271 | struct fb_info *info; |
| 272 | struct geodefb_par *par; |
| 273 | int ret; |
| 274 | |
| 275 | #ifndef MODULE |
| 276 | if (fb_get_options("gx1fb", NULL)) |
| 277 | return -ENODEV; |
| 278 | #endif |
| 279 | |
| 280 | info = gx1fb_init_fbinfo(); |
| 281 | if (!info) |
| 282 | return -ENOMEM; |
| 283 | gx1fb_info = info; |
| 284 | |
| 285 | par = info->par; |
| 286 | |
| 287 | /* GX1 display controller and CS5530 video device */ |
| 288 | par->dc_ops = &gx1_dc_ops; |
| 289 | par->vid_ops = &cs5530_vid_ops; |
| 290 | |
| 291 | if ((ret = gx1fb_map_video_memory(info)) < 0) { |
| 292 | printk(KERN_ERR "%s: gx1fb_map_video_memory() failed\n", info->fix.id); |
| 293 | goto err; |
| 294 | } |
| 295 | |
| 296 | ret = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 16); |
| 297 | if (ret == 0 || ret == 4) { |
| 298 | printk(KERN_ERR "%s: could not find valid video mode\n", info->fix.id); |
| 299 | ret = -EINVAL; |
| 300 | goto err; |
| 301 | } |
| 302 | |
| 303 | /* Clear the frame buffer of garbage. */ |
| 304 | memset_io(info->screen_base, 0, info->fix.smem_len); |
| 305 | |
| 306 | gx1fb_check_var(&info->var, info); |
| 307 | gx1fb_set_par(info); |
| 308 | |
| 309 | if (register_framebuffer(info) < 0) { |
| 310 | ret = -EINVAL; |
| 311 | goto err; |
| 312 | } |
| 313 | printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id); |
| 314 | return 0; |
| 315 | |
| 316 | err: |
| 317 | if (info->screen_base) |
| 318 | iounmap(info->screen_base); |
| 319 | if (par->vid_regs) |
| 320 | iounmap(par->vid_regs); |
| 321 | if (par->dc_regs) |
| 322 | iounmap(par->dc_regs); |
| 323 | if (par->vid_dev) |
| 324 | pci_dev_put(par->vid_dev); |
| 325 | if (info) |
| 326 | framebuffer_release(info); |
| 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | static void __exit gx1fb_cleanup(void) |
| 331 | { |
| 332 | struct fb_info *info = gx1fb_info; |
| 333 | struct geodefb_par *par = gx1fb_info->par; |
| 334 | |
| 335 | unregister_framebuffer(info); |
| 336 | |
| 337 | iounmap((void __iomem *)info->screen_base); |
| 338 | iounmap(par->vid_regs); |
| 339 | iounmap(par->dc_regs); |
| 340 | |
| 341 | pci_dev_put(par->vid_dev); |
| 342 | |
| 343 | framebuffer_release(info); |
| 344 | } |
| 345 | |
| 346 | module_init(gx1fb_init); |
| 347 | module_exit(gx1fb_cleanup); |
| 348 | |
| 349 | module_param_string(mode, mode_option, sizeof(mode_option), 0444); |
| 350 | MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])"); |
| 351 | |
| 352 | module_param_named(crt, crt_option, int, 0444); |
| 353 | MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)"); |
| 354 | |
| 355 | module_param_string(panel, panel_option, sizeof(panel_option), 0444); |
| 356 | MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)"); |
| 357 | |
| 358 | MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1"); |
| 359 | MODULE_LICENSE("GPL"); |