linux/drivers/video/fbdev/acornfb.c
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   1/*
   2 *  linux/drivers/video/acornfb.c
   3 *
   4 *  Copyright (C) 1998-2001 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * Frame buffer code for Acorn platforms
  11 *
  12 * NOTE: Most of the modes with X!=640 will disappear shortly.
  13 * NOTE: Startup setting of HS & VS polarity not supported.
  14 *       (do we need to support it if we're coming up in 640x480?)
  15 *
  16 * FIXME: (things broken by the "new improved" FBCON API)
  17 *  - Blanking 8bpp displays with VIDC
  18 */
  19
  20#include <linux/module.h>
  21#include <linux/kernel.h>
  22#include <linux/errno.h>
  23#include <linux/string.h>
  24#include <linux/ctype.h>
  25#include <linux/mm.h>
  26#include <linux/init.h>
  27#include <linux/fb.h>
  28#include <linux/platform_device.h>
  29#include <linux/dma-mapping.h>
  30#include <linux/io.h>
  31#include <linux/gfp.h>
  32
  33#include <mach/hardware.h>
  34#include <asm/irq.h>
  35#include <asm/mach-types.h>
  36#include <asm/pgtable.h>
  37
  38#include "acornfb.h"
  39
  40/*
  41 * Default resolution.
  42 * NOTE that it has to be supported in the table towards
  43 * the end of this file.
  44 */
  45#define DEFAULT_XRES    640
  46#define DEFAULT_YRES    480
  47#define DEFAULT_BPP     4
  48
  49/*
  50 * define this to debug the video mode selection
  51 */
  52#undef DEBUG_MODE_SELECTION
  53
  54/*
  55 * Translation from RISC OS monitor types to actual
  56 * HSYNC and VSYNC frequency ranges.  These are
  57 * probably not right, but they're the best info I
  58 * have.  Allow 1% either way on the nominal for TVs.
  59 */
  60#define NR_MONTYPES     6
  61static struct fb_monspecs monspecs[NR_MONTYPES] = {
  62        {       /* TV           */
  63                .hfmin  = 15469,
  64                .hfmax  = 15781,
  65                .vfmin  = 49,
  66                .vfmax  = 51,
  67        }, {    /* Multi Freq   */
  68                .hfmin  = 0,
  69                .hfmax  = 99999,
  70                .vfmin  = 0,
  71                .vfmax  = 199,
  72        }, {    /* Hi-res mono  */
  73                .hfmin  = 58608,
  74                .hfmax  = 58608,
  75                .vfmin  = 64,
  76                .vfmax  = 64,
  77        }, {    /* VGA          */
  78                .hfmin  = 30000,
  79                .hfmax  = 70000,
  80                .vfmin  = 60,
  81                .vfmax  = 60,
  82        }, {    /* SVGA         */
  83                .hfmin  = 30000,
  84                .hfmax  = 70000,
  85                .vfmin  = 56,
  86                .vfmax  = 75,
  87        }, {
  88                .hfmin  = 30000,
  89                .hfmax  = 70000,
  90                .vfmin  = 60,
  91                .vfmax  = 60,
  92        }
  93};
  94
  95static struct fb_info fb_info;
  96static struct acornfb_par current_par;
  97static struct vidc_timing current_vidc;
  98
  99extern unsigned int vram_size;  /* set by setup.c */
 100
 101#ifdef HAS_VIDC20
 102#include <mach/acornfb.h>
 103
 104#define MAX_SIZE        2*1024*1024
 105
 106/* VIDC20 has a different set of rules from the VIDC:
 107 *  hcr  : must be multiple of 4
 108 *  hswr : must be even
 109 *  hdsr : must be even
 110 *  hder : must be even
 111 *  vcr  : >= 2, (interlace, must be odd)
 112 *  vswr : >= 1
 113 *  vdsr : >= 1
 114 *  vder : >= vdsr
 115 */
 116static void acornfb_set_timing(struct fb_info *info)
 117{
 118        struct fb_var_screeninfo *var = &info->var;
 119        struct vidc_timing vidc;
 120        u_int vcr, fsize;
 121        u_int ext_ctl, dat_ctl;
 122        u_int words_per_line;
 123
 124        memset(&vidc, 0, sizeof(vidc));
 125
 126        vidc.h_sync_width       = var->hsync_len - 8;
 127        vidc.h_border_start     = vidc.h_sync_width + var->left_margin + 8 - 12;
 128        vidc.h_display_start    = vidc.h_border_start + 12 - 18;
 129        vidc.h_display_end      = vidc.h_display_start + var->xres;
 130        vidc.h_border_end       = vidc.h_display_end + 18 - 12;
 131        vidc.h_cycle            = vidc.h_border_end + var->right_margin + 12 - 8;
 132        vidc.h_interlace        = vidc.h_cycle / 2;
 133        vidc.v_sync_width       = var->vsync_len - 1;
 134        vidc.v_border_start     = vidc.v_sync_width + var->upper_margin;
 135        vidc.v_display_start    = vidc.v_border_start;
 136        vidc.v_display_end      = vidc.v_display_start + var->yres;
 137        vidc.v_border_end       = vidc.v_display_end;
 138        vidc.control            = acornfb_default_control();
 139
 140        vcr = var->vsync_len + var->upper_margin + var->yres +
 141              var->lower_margin;
 142
 143        if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
 144                vidc.v_cycle = (vcr - 3) / 2;
 145                vidc.control |= VIDC20_CTRL_INT;
 146        } else
 147                vidc.v_cycle = vcr - 2;
 148
 149        switch (var->bits_per_pixel) {
 150        case  1: vidc.control |= VIDC20_CTRL_1BPP;      break;
 151        case  2: vidc.control |= VIDC20_CTRL_2BPP;      break;
 152        case  4: vidc.control |= VIDC20_CTRL_4BPP;      break;
 153        default:
 154        case  8: vidc.control |= VIDC20_CTRL_8BPP;      break;
 155        case 16: vidc.control |= VIDC20_CTRL_16BPP;     break;
 156        case 32: vidc.control |= VIDC20_CTRL_32BPP;     break;
 157        }
 158
 159        acornfb_vidc20_find_rates(&vidc, var);
 160        fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1;
 161
 162        if (memcmp(&current_vidc, &vidc, sizeof(vidc))) {
 163                current_vidc = vidc;
 164
 165                vidc_writel(VIDC20_CTRL| vidc.control);
 166                vidc_writel(0xd0000000 | vidc.pll_ctl);
 167                vidc_writel(0x80000000 | vidc.h_cycle);
 168                vidc_writel(0x81000000 | vidc.h_sync_width);
 169                vidc_writel(0x82000000 | vidc.h_border_start);
 170                vidc_writel(0x83000000 | vidc.h_display_start);
 171                vidc_writel(0x84000000 | vidc.h_display_end);
 172                vidc_writel(0x85000000 | vidc.h_border_end);
 173                vidc_writel(0x86000000);
 174                vidc_writel(0x87000000 | vidc.h_interlace);
 175                vidc_writel(0x90000000 | vidc.v_cycle);
 176                vidc_writel(0x91000000 | vidc.v_sync_width);
 177                vidc_writel(0x92000000 | vidc.v_border_start);
 178                vidc_writel(0x93000000 | vidc.v_display_start);
 179                vidc_writel(0x94000000 | vidc.v_display_end);
 180                vidc_writel(0x95000000 | vidc.v_border_end);
 181                vidc_writel(0x96000000);
 182                vidc_writel(0x97000000);
 183        }
 184
 185        iomd_writel(fsize, IOMD_FSIZE);
 186
 187        ext_ctl = acornfb_default_econtrol();
 188
 189        if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
 190                ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC;
 191        else {
 192                if (var->sync & FB_SYNC_HOR_HIGH_ACT)
 193                        ext_ctl |= VIDC20_ECTL_HS_HSYNC;
 194                else
 195                        ext_ctl |= VIDC20_ECTL_HS_NHSYNC;
 196
 197                if (var->sync & FB_SYNC_VERT_HIGH_ACT)
 198                        ext_ctl |= VIDC20_ECTL_VS_VSYNC;
 199                else
 200                        ext_ctl |= VIDC20_ECTL_VS_NVSYNC;
 201        }
 202
 203        vidc_writel(VIDC20_ECTL | ext_ctl);
 204
 205        words_per_line = var->xres * var->bits_per_pixel / 32;
 206
 207        if (current_par.using_vram && info->fix.smem_len == 2048*1024)
 208                words_per_line /= 2;
 209
 210        /* RiscPC doesn't use the VIDC's VRAM control. */
 211        dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line;
 212
 213        /* The data bus width is dependent on both the type
 214         * and amount of video memory.
 215         *     DRAM     32bit low
 216         * 1MB VRAM     32bit
 217         * 2MB VRAM     64bit
 218         */
 219        if (current_par.using_vram && current_par.vram_half_sam == 2048)
 220                dat_ctl |= VIDC20_DCTL_BUS_D63_0;
 221        else
 222                dat_ctl |= VIDC20_DCTL_BUS_D31_0;
 223
 224        vidc_writel(VIDC20_DCTL | dat_ctl);
 225
 226#ifdef DEBUG_MODE_SELECTION
 227        printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
 228               var->yres, var->bits_per_pixel);
 229        printk(KERN_DEBUG " H-cycle          : %d\n", vidc.h_cycle);
 230        printk(KERN_DEBUG " H-sync-width     : %d\n", vidc.h_sync_width);
 231        printk(KERN_DEBUG " H-border-start   : %d\n", vidc.h_border_start);
 232        printk(KERN_DEBUG " H-display-start  : %d\n", vidc.h_display_start);
 233        printk(KERN_DEBUG " H-display-end    : %d\n", vidc.h_display_end);
 234        printk(KERN_DEBUG " H-border-end     : %d\n", vidc.h_border_end);
 235        printk(KERN_DEBUG " H-interlace      : %d\n", vidc.h_interlace);
 236        printk(KERN_DEBUG " V-cycle          : %d\n", vidc.v_cycle);
 237        printk(KERN_DEBUG " V-sync-width     : %d\n", vidc.v_sync_width);
 238        printk(KERN_DEBUG " V-border-start   : %d\n", vidc.v_border_start);
 239        printk(KERN_DEBUG " V-display-start  : %d\n", vidc.v_display_start);
 240        printk(KERN_DEBUG " V-display-end    : %d\n", vidc.v_display_end);
 241        printk(KERN_DEBUG " V-border-end     : %d\n", vidc.v_border_end);
 242        printk(KERN_DEBUG " Ext Ctrl  (C)    : 0x%08X\n", ext_ctl);
 243        printk(KERN_DEBUG " PLL Ctrl  (D)    : 0x%08X\n", vidc.pll_ctl);
 244        printk(KERN_DEBUG " Ctrl      (E)    : 0x%08X\n", vidc.control);
 245        printk(KERN_DEBUG " Data Ctrl (F)    : 0x%08X\n", dat_ctl);
 246        printk(KERN_DEBUG " Fsize            : 0x%08X\n", fsize);
 247#endif
 248}
 249
 250/*
 251 * We have to take note of the VIDC20's 16-bit palette here.
 252 * The VIDC20 looks up a 16 bit pixel as follows:
 253 *
 254 *   bits   111111
 255 *          5432109876543210
 256 *   red            ++++++++  (8 bits,  7 to 0)
 257 *  green       ++++++++      (8 bits, 11 to 4)
 258 *   blue   ++++++++          (8 bits, 15 to 8)
 259 *
 260 * We use a pixel which looks like:
 261 *
 262 *   bits   111111
 263 *          5432109876543210
 264 *   red               +++++  (5 bits,  4 to  0)
 265 *  green         +++++       (5 bits,  9 to  5)
 266 *   blue    +++++            (5 bits, 14 to 10)
 267 */
 268static int
 269acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 270                  u_int trans, struct fb_info *info)
 271{
 272        union palette pal;
 273
 274        if (regno >= current_par.palette_size)
 275                return 1;
 276
 277        if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 278                u32 pseudo_val;
 279
 280                pseudo_val  = regno << info->var.red.offset;
 281                pseudo_val |= regno << info->var.green.offset;
 282                pseudo_val |= regno << info->var.blue.offset;
 283
 284                ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
 285        }
 286
 287        pal.p = 0;
 288        pal.vidc20.red   = red >> 8;
 289        pal.vidc20.green = green >> 8;
 290        pal.vidc20.blue  = blue >> 8;
 291
 292        current_par.palette[regno] = pal;
 293
 294        if (info->var.bits_per_pixel == 16) {
 295                int i;
 296
 297                pal.p = 0;
 298                vidc_writel(0x10000000);
 299                for (i = 0; i < 256; i += 1) {
 300                        pal.vidc20.red   = current_par.palette[ i       & 31].vidc20.red;
 301                        pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
 302                        pal.vidc20.blue  = current_par.palette[(i >> 2) & 31].vidc20.blue;
 303                        vidc_writel(pal.p);
 304                        /* Palette register pointer auto-increments */
 305                }
 306        } else {
 307                vidc_writel(0x10000000 | regno);
 308                vidc_writel(pal.p);
 309        }
 310
 311        return 0;
 312}
 313#endif
 314
 315/*
 316 * Before selecting the timing parameters, adjust
 317 * the resolution to fit the rules.
 318 */
 319static int
 320acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht)
 321{
 322        u_int font_line_len, sam_size, min_size, size, nr_y;
 323
 324        /* xres must be even */
 325        var->xres = (var->xres + 1) & ~1;
 326
 327        /*
 328         * We don't allow xres_virtual to differ from xres
 329         */
 330        var->xres_virtual = var->xres;
 331        var->xoffset = 0;
 332
 333        if (current_par.using_vram)
 334                sam_size = current_par.vram_half_sam * 2;
 335        else
 336                sam_size = 16;
 337
 338        /*
 339         * Now, find a value for yres_virtual which allows
 340         * us to do ywrap scrolling.  The value of
 341         * yres_virtual must be such that the end of the
 342         * displayable frame buffer must be aligned with
 343         * the start of a font line.
 344         */
 345        font_line_len = var->xres * var->bits_per_pixel * fontht / 8;
 346        min_size = var->xres * var->yres * var->bits_per_pixel / 8;
 347
 348        /*
 349         * If minimum screen size is greater than that we have
 350         * available, reject it.
 351         */
 352        if (min_size > info->fix.smem_len)
 353                return -EINVAL;
 354
 355        /* Find int 'y', such that y * fll == s * sam < maxsize
 356         * y = s * sam / fll; s = maxsize / sam
 357         */
 358        for (size = info->fix.smem_len;
 359             nr_y = size / font_line_len, min_size <= size;
 360             size -= sam_size) {
 361                if (nr_y * font_line_len == size)
 362                        break;
 363        }
 364        nr_y *= fontht;
 365
 366        if (var->accel_flags & FB_ACCELF_TEXT) {
 367                if (min_size > size) {
 368                        /*
 369                         * failed, use ypan
 370                         */
 371                        size = info->fix.smem_len;
 372                        var->yres_virtual = size / (font_line_len / fontht);
 373                } else
 374                        var->yres_virtual = nr_y;
 375        } else if (var->yres_virtual > nr_y)
 376                var->yres_virtual = nr_y;
 377
 378        current_par.screen_end = info->fix.smem_start + size;
 379
 380        /*
 381         * Fix yres & yoffset if needed.
 382         */
 383        if (var->yres > var->yres_virtual)
 384                var->yres = var->yres_virtual;
 385
 386        if (var->vmode & FB_VMODE_YWRAP) {
 387                if (var->yoffset > var->yres_virtual)
 388                        var->yoffset = var->yres_virtual;
 389        } else {
 390                if (var->yoffset + var->yres > var->yres_virtual)
 391                        var->yoffset = var->yres_virtual - var->yres;
 392        }
 393
 394        /* hsync_len must be even */
 395        var->hsync_len = (var->hsync_len + 1) & ~1;
 396
 397#if defined(HAS_VIDC20)
 398        /* left_margin must be even */
 399        if (var->left_margin & 1) {
 400                var->left_margin += 1;
 401                var->right_margin -= 1;
 402        }
 403
 404        /* right_margin must be even */
 405        if (var->right_margin & 1)
 406                var->right_margin += 1;
 407#endif
 408
 409        if (var->vsync_len < 1)
 410                var->vsync_len = 1;
 411
 412        return 0;
 413}
 414
 415static int
 416acornfb_validate_timing(struct fb_var_screeninfo *var,
 417                        struct fb_monspecs *monspecs)
 418{
 419        unsigned long hs, vs;
 420
 421        /*
 422         * hs(Hz) = 10^12 / (pixclock * xtotal)
 423         * vs(Hz) = hs(Hz) / ytotal
 424         *
 425         * No need to do long long divisions or anything
 426         * like that if you factor it correctly
 427         */
 428        hs = 1953125000 / var->pixclock;
 429        hs = hs * 512 /
 430             (var->xres + var->left_margin + var->right_margin + var->hsync_len);
 431        vs = hs /
 432             (var->yres + var->upper_margin + var->lower_margin + var->vsync_len);
 433
 434        return (vs >= monspecs->vfmin && vs <= monspecs->vfmax &&
 435                hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL;
 436}
 437
 438static inline void
 439acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var)
 440{
 441        u_int off = var->yoffset * info->fix.line_length;
 442
 443#if defined(HAS_MEMC)
 444        memc_write(VDMA_INIT, off >> 2);
 445#elif defined(HAS_IOMD)
 446        iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT);
 447#endif
 448}
 449
 450static int
 451acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 452{
 453        u_int fontht;
 454        int err;
 455
 456        /*
 457         * FIXME: Find the font height
 458         */
 459        fontht = 8;
 460
 461        var->red.msb_right = 0;
 462        var->green.msb_right = 0;
 463        var->blue.msb_right = 0;
 464        var->transp.msb_right = 0;
 465
 466        switch (var->bits_per_pixel) {
 467        case 1: case 2: case 4: case 8:
 468                var->red.offset    = 0;
 469                var->red.length    = var->bits_per_pixel;
 470                var->green         = var->red;
 471                var->blue          = var->red;
 472                var->transp.offset = 0;
 473                var->transp.length = 0;
 474                break;
 475
 476#ifdef HAS_VIDC20
 477        case 16:
 478                var->red.offset    = 0;
 479                var->red.length    = 5;
 480                var->green.offset  = 5;
 481                var->green.length  = 5;
 482                var->blue.offset   = 10;
 483                var->blue.length   = 5;
 484                var->transp.offset = 15;
 485                var->transp.length = 1;
 486                break;
 487
 488        case 32:
 489                var->red.offset    = 0;
 490                var->red.length    = 8;
 491                var->green.offset  = 8;
 492                var->green.length  = 8;
 493                var->blue.offset   = 16;
 494                var->blue.length   = 8;
 495                var->transp.offset = 24;
 496                var->transp.length = 4;
 497                break;
 498#endif
 499        default:
 500                return -EINVAL;
 501        }
 502
 503        /*
 504         * Check to see if the pixel rate is valid.
 505         */
 506        if (!acornfb_valid_pixrate(var))
 507                return -EINVAL;
 508
 509        /*
 510         * Validate and adjust the resolution to
 511         * match the video generator hardware.
 512         */
 513        err = acornfb_adjust_timing(info, var, fontht);
 514        if (err)
 515                return err;
 516
 517        /*
 518         * Validate the timing against the
 519         * monitor hardware.
 520         */
 521        return acornfb_validate_timing(var, &info->monspecs);
 522}
 523
 524static int acornfb_set_par(struct fb_info *info)
 525{
 526        switch (info->var.bits_per_pixel) {
 527        case 1:
 528                current_par.palette_size = 2;
 529                info->fix.visual = FB_VISUAL_MONO10;
 530                break;
 531        case 2:
 532                current_par.palette_size = 4;
 533                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 534                break;
 535        case 4:
 536                current_par.palette_size = 16;
 537                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 538                break;
 539        case 8:
 540                current_par.palette_size = VIDC_PALETTE_SIZE;
 541                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 542                break;
 543#ifdef HAS_VIDC20
 544        case 16:
 545                current_par.palette_size = 32;
 546                info->fix.visual = FB_VISUAL_DIRECTCOLOR;
 547                break;
 548        case 32:
 549                current_par.palette_size = VIDC_PALETTE_SIZE;
 550                info->fix.visual = FB_VISUAL_DIRECTCOLOR;
 551                break;
 552#endif
 553        default:
 554                BUG();
 555        }
 556
 557        info->fix.line_length   = (info->var.xres * info->var.bits_per_pixel) / 8;
 558
 559#if defined(HAS_MEMC)
 560        {
 561                unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;
 562
 563                memc_write(VDMA_START, 0);
 564                memc_write(VDMA_END, size >> 2);
 565        }
 566#elif defined(HAS_IOMD)
 567        {
 568                unsigned long start, size;
 569                u_int control;
 570
 571                start = info->fix.smem_start;
 572                size  = current_par.screen_end;
 573
 574                if (current_par.using_vram) {
 575                        size -= current_par.vram_half_sam;
 576                        control = DMA_CR_E | (current_par.vram_half_sam / 256);
 577                } else {
 578                        size -= 16;
 579                        control = DMA_CR_E | DMA_CR_D | 16;
 580                }
 581
 582                iomd_writel(start,   IOMD_VIDSTART);
 583                iomd_writel(size,    IOMD_VIDEND);
 584                iomd_writel(control, IOMD_VIDCR);
 585        }
 586#endif
 587
 588        acornfb_update_dma(info, &info->var);
 589        acornfb_set_timing(info);
 590
 591        return 0;
 592}
 593
 594static int
 595acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 596{
 597        u_int y_bottom = var->yoffset;
 598
 599        if (!(var->vmode & FB_VMODE_YWRAP))
 600                y_bottom += info->var.yres;
 601
 602        if (y_bottom > info->var.yres_virtual)
 603                return -EINVAL;
 604
 605        acornfb_update_dma(info, var);
 606
 607        return 0;
 608}
 609
 610static struct fb_ops acornfb_ops = {
 611        .owner          = THIS_MODULE,
 612        .fb_check_var   = acornfb_check_var,
 613        .fb_set_par     = acornfb_set_par,
 614        .fb_setcolreg   = acornfb_setcolreg,
 615        .fb_pan_display = acornfb_pan_display,
 616        .fb_fillrect    = cfb_fillrect,
 617        .fb_copyarea    = cfb_copyarea,
 618        .fb_imageblit   = cfb_imageblit,
 619};
 620
 621/*
 622 * Everything after here is initialisation!!!
 623 */
 624static struct fb_videomode modedb[] = {
 625        {       /* 320x256 @ 50Hz */
 626                NULL, 50,  320,  256, 125000,  92,  62,  35, 19,  38, 2,
 627                FB_SYNC_COMP_HIGH_ACT,
 628                FB_VMODE_NONINTERLACED
 629        }, {    /* 640x250 @ 50Hz, 15.6 kHz hsync */
 630                NULL, 50,  640,  250,  62500, 185, 123,  38, 21,  76, 3,
 631                0,
 632                FB_VMODE_NONINTERLACED
 633        }, {    /* 640x256 @ 50Hz, 15.6 kHz hsync */
 634                NULL, 50,  640,  256,  62500, 185, 123,  35, 18,  76, 3,
 635                0,
 636                FB_VMODE_NONINTERLACED
 637        }, {    /* 640x512 @ 50Hz, 26.8 kHz hsync */
 638                NULL, 50,  640,  512,  41667, 113,  87,  18,  1,  56, 3,
 639                0,
 640                FB_VMODE_NONINTERLACED
 641        }, {    /* 640x250 @ 70Hz, 31.5 kHz hsync */
 642                NULL, 70,  640,  250,  39722,  48,  16, 109, 88,  96, 2,
 643                0,
 644                FB_VMODE_NONINTERLACED
 645        }, {    /* 640x256 @ 70Hz, 31.5 kHz hsync */
 646                NULL, 70,  640,  256,  39722,  48,  16, 106, 85,  96, 2,
 647                0,
 648                FB_VMODE_NONINTERLACED
 649        }, {    /* 640x352 @ 70Hz, 31.5 kHz hsync */
 650                NULL, 70,  640,  352,  39722,  48,  16,  58, 37,  96, 2,
 651                0,
 652                FB_VMODE_NONINTERLACED
 653        }, {    /* 640x480 @ 60Hz, 31.5 kHz hsync */
 654                NULL, 60,  640,  480,  39722,  48,  16,  32, 11,  96, 2,
 655                0,
 656                FB_VMODE_NONINTERLACED
 657        }, {    /* 800x600 @ 56Hz, 35.2 kHz hsync */
 658                NULL, 56,  800,  600,  27778, 101,  23,  22,  1, 100, 2,
 659                0,
 660                FB_VMODE_NONINTERLACED
 661        }, {    /* 896x352 @ 60Hz, 21.8 kHz hsync */
 662                NULL, 60,  896,  352,  41667,  59,  27,   9,  0, 118, 3,
 663                0,
 664                FB_VMODE_NONINTERLACED
 665        }, {    /* 1024x 768 @ 60Hz, 48.4 kHz hsync */
 666                NULL, 60, 1024,  768,  15385, 160,  24,  29,  3, 136, 6,
 667                0,
 668                FB_VMODE_NONINTERLACED
 669        }, {    /* 1280x1024 @ 60Hz, 63.8 kHz hsync */
 670                NULL, 60, 1280, 1024,   9090, 186,  96,  38,  1, 160, 3,
 671                0,
 672                FB_VMODE_NONINTERLACED
 673        }
 674};
 675
 676static struct fb_videomode acornfb_default_mode = {
 677        .name =         NULL,
 678        .refresh =      60,
 679        .xres =         640,
 680        .yres =         480,
 681        .pixclock =     39722,
 682        .left_margin =  56,
 683        .right_margin = 16,
 684        .upper_margin = 34,
 685        .lower_margin = 9,
 686        .hsync_len =    88,
 687        .vsync_len =    2,
 688        .sync =         0,
 689        .vmode =        FB_VMODE_NONINTERLACED
 690};
 691
 692static void acornfb_init_fbinfo(void)
 693{
 694        static int first = 1;
 695
 696        if (!first)
 697                return;
 698        first = 0;
 699
 700        fb_info.fbops           = &acornfb_ops;
 701        fb_info.flags           = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 702        fb_info.pseudo_palette  = current_par.pseudo_palette;
 703
 704        strcpy(fb_info.fix.id, "Acorn");
 705        fb_info.fix.type        = FB_TYPE_PACKED_PIXELS;
 706        fb_info.fix.type_aux    = 0;
 707        fb_info.fix.xpanstep    = 0;
 708        fb_info.fix.ypanstep    = 1;
 709        fb_info.fix.ywrapstep   = 1;
 710        fb_info.fix.line_length = 0;
 711        fb_info.fix.accel       = FB_ACCEL_NONE;
 712
 713        /*
 714         * setup initial parameters
 715         */
 716        memset(&fb_info.var, 0, sizeof(fb_info.var));
 717
 718#if defined(HAS_VIDC20)
 719        fb_info.var.red.length     = 8;
 720        fb_info.var.transp.length  = 4;
 721#endif
 722        fb_info.var.green          = fb_info.var.red;
 723        fb_info.var.blue           = fb_info.var.red;
 724        fb_info.var.nonstd         = 0;
 725        fb_info.var.activate       = FB_ACTIVATE_NOW;
 726        fb_info.var.height         = -1;
 727        fb_info.var.width          = -1;
 728        fb_info.var.vmode          = FB_VMODE_NONINTERLACED;
 729        fb_info.var.accel_flags    = FB_ACCELF_TEXT;
 730
 731        current_par.dram_size      = 0;
 732        current_par.montype        = -1;
 733        current_par.dpms           = 0;
 734}
 735
 736/*
 737 * setup acornfb options:
 738 *
 739 *  mon:hmin-hmax:vmin-vmax:dpms:width:height
 740 *      Set monitor parameters:
 741 *              hmin   = horizontal minimum frequency (Hz)
 742 *              hmax   = horizontal maximum frequency (Hz)      (optional)
 743 *              vmin   = vertical minimum frequency (Hz)
 744 *              vmax   = vertical maximum frequency (Hz)        (optional)
 745 *              dpms   = DPMS supported?                        (optional)
 746 *              width  = width of picture in mm.                (optional)
 747 *              height = height of picture in mm.               (optional)
 748 *
 749 * montype:type
 750 *      Set RISC-OS style monitor type:
 751 *              0 (or tv)       - TV frequency
 752 *              1 (or multi)    - Multi frequency
 753 *              2 (or hires)    - Hi-res monochrome
 754 *              3 (or vga)      - VGA
 755 *              4 (or svga)     - SVGA
 756 *              auto, or option missing
 757 *                              - try hardware detect
 758 *
 759 * dram:size
 760 *      Set the amount of DRAM to use for the frame buffer
 761 *      (even if you have VRAM).
 762 *      size can optionally be followed by 'M' or 'K' for
 763 *      MB or KB respectively.
 764 */
 765static void acornfb_parse_mon(char *opt)
 766{
 767        char *p = opt;
 768
 769        current_par.montype = -2;
 770
 771        fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0);
 772        if (*p == '-')
 773                fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0);
 774        else
 775                fb_info.monspecs.hfmax = fb_info.monspecs.hfmin;
 776
 777        if (*p != ':')
 778                goto bad;
 779
 780        fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0);
 781        if (*p == '-')
 782                fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0);
 783        else
 784                fb_info.monspecs.vfmax = fb_info.monspecs.vfmin;
 785
 786        if (*p != ':')
 787                goto check_values;
 788
 789        fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0);
 790
 791        if (*p != ':')
 792                goto check_values;
 793
 794        fb_info.var.width = simple_strtoul(p + 1, &p, 0);
 795
 796        if (*p != ':')
 797                goto check_values;
 798
 799        fb_info.var.height = simple_strtoul(p + 1, NULL, 0);
 800
 801check_values:
 802        if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin ||
 803            fb_info.monspecs.vfmax < fb_info.monspecs.vfmin)
 804                goto bad;
 805        return;
 806
 807bad:
 808        printk(KERN_ERR "Acornfb: bad monitor settings: %s\n", opt);
 809        current_par.montype = -1;
 810}
 811
 812static void acornfb_parse_montype(char *opt)
 813{
 814        current_par.montype = -2;
 815
 816        if (strncmp(opt, "tv", 2) == 0) {
 817                opt += 2;
 818                current_par.montype = 0;
 819        } else if (strncmp(opt, "multi", 5) == 0) {
 820                opt += 5;
 821                current_par.montype = 1;
 822        } else if (strncmp(opt, "hires", 5) == 0) {
 823                opt += 5;
 824                current_par.montype = 2;
 825        } else if (strncmp(opt, "vga", 3) == 0) {
 826                opt += 3;
 827                current_par.montype = 3;
 828        } else if (strncmp(opt, "svga", 4) == 0) {
 829                opt += 4;
 830                current_par.montype = 4;
 831        } else if (strncmp(opt, "auto", 4) == 0) {
 832                opt += 4;
 833                current_par.montype = -1;
 834        } else if (isdigit(*opt))
 835                current_par.montype = simple_strtoul(opt, &opt, 0);
 836
 837        if (current_par.montype == -2 ||
 838            current_par.montype > NR_MONTYPES) {
 839                printk(KERN_ERR "acornfb: unknown monitor type: %s\n",
 840                        opt);
 841                current_par.montype = -1;
 842        } else
 843        if (opt && *opt) {
 844                if (strcmp(opt, ",dpms") == 0)
 845                        current_par.dpms = 1;
 846                else
 847                        printk(KERN_ERR
 848                               "acornfb: unknown monitor option: %s\n",
 849                               opt);
 850        }
 851}
 852
 853static void acornfb_parse_dram(char *opt)
 854{
 855        unsigned int size;
 856
 857        size = simple_strtoul(opt, &opt, 0);
 858
 859        if (opt) {
 860                switch (*opt) {
 861                case 'M':
 862                case 'm':
 863                        size *= 1024;
 864                case 'K':
 865                case 'k':
 866                        size *= 1024;
 867                default:
 868                        break;
 869                }
 870        }
 871
 872        current_par.dram_size = size;
 873}
 874
 875static struct options {
 876        char *name;
 877        void (*parse)(char *opt);
 878} opt_table[] = {
 879        { "mon",     acornfb_parse_mon     },
 880        { "montype", acornfb_parse_montype },
 881        { "dram",    acornfb_parse_dram    },
 882        { NULL, NULL }
 883};
 884
 885static int acornfb_setup(char *options)
 886{
 887        struct options *optp;
 888        char *opt;
 889
 890        if (!options || !*options)
 891                return 0;
 892
 893        acornfb_init_fbinfo();
 894
 895        while ((opt = strsep(&options, ",")) != NULL) {
 896                if (!*opt)
 897                        continue;
 898
 899                for (optp = opt_table; optp->name; optp++) {
 900                        int optlen;
 901
 902                        optlen = strlen(optp->name);
 903
 904                        if (strncmp(opt, optp->name, optlen) == 0 &&
 905                            opt[optlen] == ':') {
 906                                optp->parse(opt + optlen + 1);
 907                                break;
 908                        }
 909                }
 910
 911                if (!optp->name)
 912                        printk(KERN_ERR "acornfb: unknown parameter: %s\n",
 913                               opt);
 914        }
 915        return 0;
 916}
 917
 918/*
 919 * Detect type of monitor connected
 920 *  For now, we just assume SVGA
 921 */
 922static int acornfb_detect_monitortype(void)
 923{
 924        return 4;
 925}
 926
 927/*
 928 * This enables the unused memory to be freed on older Acorn machines.
 929 * We are freeing memory on behalf of the architecture initialisation
 930 * code here.
 931 */
 932static inline void
 933free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
 934{
 935        int mb_freed = 0;
 936
 937        /*
 938         * Align addresses
 939         */
 940        virtual_start = PAGE_ALIGN(virtual_start);
 941        virtual_end = PAGE_ALIGN(virtual_end);
 942
 943        while (virtual_start < virtual_end) {
 944                struct page *page;
 945
 946                /*
 947                 * Clear page reserved bit,
 948                 * set count to 1, and free
 949                 * the page.
 950                 */
 951                page = virt_to_page(virtual_start);
 952                __free_reserved_page(page);
 953
 954                virtual_start += PAGE_SIZE;
 955                mb_freed += PAGE_SIZE / 1024;
 956        }
 957
 958        printk("acornfb: freed %dK memory\n", mb_freed);
 959}
 960
 961static int acornfb_probe(struct platform_device *dev)
 962{
 963        unsigned long size;
 964        u_int h_sync, v_sync;
 965        int rc, i;
 966        char *option = NULL;
 967
 968        if (fb_get_options("acornfb", &option))
 969                return -ENODEV;
 970        acornfb_setup(option);
 971
 972        acornfb_init_fbinfo();
 973
 974        current_par.dev = &dev->dev;
 975
 976        if (current_par.montype == -1)
 977                current_par.montype = acornfb_detect_monitortype();
 978
 979        if (current_par.montype == -1 || current_par.montype > NR_MONTYPES)
 980                current_par.montype = 4;
 981
 982        if (current_par.montype >= 0) {
 983                fb_info.monspecs = monspecs[current_par.montype];
 984                fb_info.monspecs.dpms = current_par.dpms;
 985        }
 986
 987        /*
 988         * Try to select a suitable default mode
 989         */
 990        for (i = 0; i < ARRAY_SIZE(modedb); i++) {
 991                unsigned long hs;
 992
 993                hs = modedb[i].refresh *
 994                     (modedb[i].yres + modedb[i].upper_margin +
 995                      modedb[i].lower_margin + modedb[i].vsync_len);
 996                if (modedb[i].xres == DEFAULT_XRES &&
 997                    modedb[i].yres == DEFAULT_YRES &&
 998                    modedb[i].refresh >= fb_info.monspecs.vfmin &&
 999                    modedb[i].refresh <= fb_info.monspecs.vfmax &&
1000                    hs                >= fb_info.monspecs.hfmin &&
1001                    hs                <= fb_info.monspecs.hfmax) {
1002                        acornfb_default_mode = modedb[i];
1003                        break;
1004                }
1005        }
1006
1007        fb_info.screen_base    = (char *)SCREEN_BASE;
1008        fb_info.fix.smem_start = SCREEN_START;
1009        current_par.using_vram = 0;
1010
1011        /*
1012         * If vram_size is set, we are using VRAM in
1013         * a Risc PC.  However, if the user has specified
1014         * an amount of DRAM then use that instead.
1015         */
1016        if (vram_size && !current_par.dram_size) {
1017                size = vram_size;
1018                current_par.vram_half_sam = vram_size / 1024;
1019                current_par.using_vram = 1;
1020        } else if (current_par.dram_size)
1021                size = current_par.dram_size;
1022        else
1023                size = MAX_SIZE;
1024
1025        /*
1026         * Limit maximum screen size.
1027         */
1028        if (size > MAX_SIZE)
1029                size = MAX_SIZE;
1030
1031        size = PAGE_ALIGN(size);
1032
1033#if defined(HAS_VIDC20)
1034        if (!current_par.using_vram) {
1035                dma_addr_t handle;
1036                void *base;
1037
1038                /*
1039                 * RiscPC needs to allocate the DRAM memory
1040                 * for the framebuffer if we are not using
1041                 * VRAM.
1042                 */
1043                base = dma_alloc_writecombine(current_par.dev, size, &handle,
1044                                              GFP_KERNEL);
1045                if (base == NULL) {
1046                        printk(KERN_ERR "acornfb: unable to allocate screen "
1047                               "memory\n");
1048                        return -ENOMEM;
1049                }
1050
1051                fb_info.screen_base = base;
1052                fb_info.fix.smem_start = handle;
1053        }
1054#endif
1055        fb_info.fix.smem_len = size;
1056        current_par.palette_size   = VIDC_PALETTE_SIZE;
1057
1058        /*
1059         * Lookup the timing for this resolution.  If we can't
1060         * find it, then we can't restore it if we change
1061         * the resolution, so we disable this feature.
1062         */
1063        do {
1064                rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1065                                 ARRAY_SIZE(modedb),
1066                                 &acornfb_default_mode, DEFAULT_BPP);
1067                /*
1068                 * If we found an exact match, all ok.
1069                 */
1070                if (rc == 1)
1071                        break;
1072
1073                rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1074                                  &acornfb_default_mode, DEFAULT_BPP);
1075                /*
1076                 * If we found an exact match, all ok.
1077                 */
1078                if (rc == 1)
1079                        break;
1080
1081                rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1082                                 ARRAY_SIZE(modedb),
1083                                 &acornfb_default_mode, DEFAULT_BPP);
1084                if (rc)
1085                        break;
1086
1087                rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1088                                  &acornfb_default_mode, DEFAULT_BPP);
1089        } while (0);
1090
1091        /*
1092         * If we didn't find an exact match, try the
1093         * generic database.
1094         */
1095        if (rc == 0) {
1096                printk("Acornfb: no valid mode found\n");
1097                return -EINVAL;
1098        }
1099
1100        h_sync = 1953125000 / fb_info.var.pixclock;
1101        h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin +
1102                 fb_info.var.right_margin + fb_info.var.hsync_len);
1103        v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin +
1104                 fb_info.var.lower_margin + fb_info.var.vsync_len);
1105
1106        printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, "
1107                "%d.%03dkHz, %dHz\n",
1108                fb_info.fix.smem_len / 1024,
1109                current_par.using_vram ? 'V' : 'D',
1110                VIDC_NAME, fb_info.var.xres, fb_info.var.yres,
1111                h_sync / 1000, h_sync % 1000, v_sync);
1112
1113        printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n",
1114                fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000,
1115                fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000,
1116                fb_info.monspecs.vfmin, fb_info.monspecs.vfmax,
1117                fb_info.monspecs.dpms ? ", DPMS" : "");
1118
1119        if (fb_set_var(&fb_info, &fb_info.var))
1120                printk(KERN_ERR "Acornfb: unable to set display parameters\n");
1121
1122        if (register_framebuffer(&fb_info) < 0)
1123                return -EINVAL;
1124        return 0;
1125}
1126
1127static struct platform_driver acornfb_driver = {
1128        .probe  = acornfb_probe,
1129        .driver = {
1130                .name   = "acornfb",
1131        },
1132};
1133
1134static int __init acornfb_init(void)
1135{
1136        return platform_driver_register(&acornfb_driver);
1137}
1138
1139module_init(acornfb_init);
1140
1141MODULE_AUTHOR("Russell King");
1142MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
1143MODULE_LICENSE("GPL");
1144