linux/drivers/video/pvr2fb.c
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   1/*
   2 * drivers/video/pvr2fb.c
   3 *
   4 * Frame buffer and fbcon support for the NEC PowerVR2 found within the Sega
   5 * Dreamcast.
   6 *
   7 * Copyright (c) 2001 M. R. Brown <mrbrown@0xd6.org>
   8 * Copyright (c) 2001 - 2008  Paul Mundt <lethal@linux-sh.org>
   9 *
  10 * This driver is mostly based on the excellent amifb and vfb sources.  It uses
  11 * an odd scheme for converting hardware values to/from framebuffer values,
  12 * here are some hacked-up formulas:
  13 *
  14 *  The Dreamcast has screen offsets from each side of its four borders and
  15 *  the start offsets of the display window.  I used these values to calculate
  16 *  'pseudo' values (think of them as placeholders) for the fb video mode, so
  17 *  that when it came time to convert these values back into their hardware
  18 *  values, I could just add mode- specific offsets to get the correct mode
  19 *  settings:
  20 *
  21 *      left_margin = diwstart_h - borderstart_h;
  22 *      right_margin = borderstop_h - (diwstart_h + xres);
  23 *      upper_margin = diwstart_v - borderstart_v;
  24 *      lower_margin = borderstop_v - (diwstart_h + yres);
  25 *
  26 *      hsync_len = borderstart_h + (hsync_total - borderstop_h);
  27 *      vsync_len = borderstart_v + (vsync_total - borderstop_v);
  28 *
  29 *  Then, when it's time to convert back to hardware settings, the only
  30 *  constants are the borderstart_* offsets, all other values are derived from
  31 *  the fb video mode:
  32 *
  33 *      // PAL
  34 *      borderstart_h = 116;
  35 *      borderstart_v = 44;
  36 *      ...
  37 *      borderstop_h = borderstart_h + hsync_total - hsync_len;
  38 *      ...
  39 *      diwstart_v = borderstart_v - upper_margin;
  40 *
  41 *  However, in the current implementation, the borderstart values haven't had
  42 *  the benefit of being fully researched, so some modes may be broken.
  43 */
  44
  45#undef DEBUG
  46
  47#include <linux/module.h>
  48#include <linux/kernel.h>
  49#include <linux/errno.h>
  50#include <linux/string.h>
  51#include <linux/mm.h>
  52#include <linux/slab.h>
  53#include <linux/delay.h>
  54#include <linux/interrupt.h>
  55#include <linux/fb.h>
  56#include <linux/init.h>
  57#include <linux/pci.h>
  58
  59#ifdef CONFIG_SH_DREAMCAST
  60#include <asm/machvec.h>
  61#include <mach-dreamcast/mach/sysasic.h>
  62#endif
  63
  64#ifdef CONFIG_SH_DMA
  65#include <linux/pagemap.h>
  66#include <mach/dma.h>
  67#include <asm/dma.h>
  68#endif
  69
  70#ifdef CONFIG_SH_STORE_QUEUES
  71#include <linux/uaccess.h>
  72#include <cpu/sq.h>
  73#endif
  74
  75#ifndef PCI_DEVICE_ID_NEC_NEON250
  76#  define PCI_DEVICE_ID_NEC_NEON250     0x0067
  77#endif
  78
  79/* 2D video registers */
  80#define DISP_BASE       par->mmio_base
  81#define DISP_BRDRCOLR (DISP_BASE + 0x40)
  82#define DISP_DIWMODE (DISP_BASE + 0x44)
  83#define DISP_DIWADDRL (DISP_BASE + 0x50)
  84#define DISP_DIWADDRS (DISP_BASE + 0x54)
  85#define DISP_DIWSIZE (DISP_BASE + 0x5c)
  86#define DISP_SYNCCONF (DISP_BASE + 0xd0)
  87#define DISP_BRDRHORZ (DISP_BASE + 0xd4)
  88#define DISP_SYNCSIZE (DISP_BASE + 0xd8)
  89#define DISP_BRDRVERT (DISP_BASE + 0xdc)
  90#define DISP_DIWCONF (DISP_BASE + 0xe8)
  91#define DISP_DIWHSTRT (DISP_BASE + 0xec)
  92#define DISP_DIWVSTRT (DISP_BASE + 0xf0)
  93#define DISP_PIXDEPTH (DISP_BASE + 0x108)
  94
  95/* Pixel clocks, one for TV output, doubled for VGA output */
  96#define TV_CLK 74239
  97#define VGA_CLK 37119
  98
  99/* This is for 60Hz - the VTOTAL is doubled for interlaced modes */
 100#define PAL_HTOTAL 863
 101#define PAL_VTOTAL 312
 102#define NTSC_HTOTAL 857
 103#define NTSC_VTOTAL 262
 104
 105/* Supported cable types */
 106enum { CT_VGA, CT_NONE, CT_RGB, CT_COMPOSITE };
 107
 108/* Supported video output types */
 109enum { VO_PAL, VO_NTSC, VO_VGA };
 110
 111/* Supported palette types */
 112enum { PAL_ARGB1555, PAL_RGB565, PAL_ARGB4444, PAL_ARGB8888 };
 113
 114struct pvr2_params { unsigned int val; char *name; };
 115static struct pvr2_params cables[] __devinitdata = {
 116        { CT_VGA, "VGA" }, { CT_RGB, "RGB" }, { CT_COMPOSITE, "COMPOSITE" },
 117};
 118
 119static struct pvr2_params outputs[] __devinitdata = {
 120        { VO_PAL, "PAL" }, { VO_NTSC, "NTSC" }, { VO_VGA, "VGA" },
 121};
 122
 123/*
 124 * This describes the current video mode
 125 */
 126
 127static struct pvr2fb_par {
 128        unsigned int hsync_total;       /* Clocks/line */
 129        unsigned int vsync_total;       /* Lines/field */
 130        unsigned int borderstart_h;
 131        unsigned int borderstop_h;
 132        unsigned int borderstart_v;
 133        unsigned int borderstop_v;
 134        unsigned int diwstart_h;        /* Horizontal offset of the display field */
 135        unsigned int diwstart_v;        /* Vertical offset of the display field, for
 136                                   interlaced modes, this is the long field */
 137        unsigned long disp_start;       /* Address of image within VRAM */
 138        unsigned char is_interlaced;    /* Is the display interlaced? */
 139        unsigned char is_doublescan;    /* Are scanlines output twice? (doublescan) */
 140        unsigned char is_lowres;        /* Is horizontal pixel-doubling enabled? */
 141
 142        unsigned long mmio_base;        /* MMIO base */
 143        u32 palette[16];
 144} *currentpar;
 145
 146static struct fb_info *fb_info;
 147
 148static struct fb_fix_screeninfo pvr2_fix __devinitdata = {
 149        .id =           "NEC PowerVR2",
 150        .type =         FB_TYPE_PACKED_PIXELS,
 151        .visual =       FB_VISUAL_TRUECOLOR,
 152        .ypanstep =     1,
 153        .ywrapstep =    1,
 154        .accel =        FB_ACCEL_NONE,
 155};
 156
 157static struct fb_var_screeninfo pvr2_var __devinitdata = {
 158        .xres =         640,
 159        .yres =         480,
 160        .xres_virtual = 640,
 161        .yres_virtual = 480,
 162        .bits_per_pixel =16,
 163        .red =          { 11, 5, 0 },
 164        .green =        {  5, 6, 0 },
 165        .blue =         {  0, 5, 0 },
 166        .activate =     FB_ACTIVATE_NOW,
 167        .height =       -1,
 168        .width =        -1,
 169        .vmode =        FB_VMODE_NONINTERLACED,
 170};
 171
 172static int cable_type = CT_VGA;
 173static int video_output = VO_VGA;
 174
 175static int nopan = 0;
 176static int nowrap = 1;
 177
 178/*
 179 * We do all updating, blanking, etc. during the vertical retrace period
 180 */
 181static unsigned int do_vmode_full = 0;  /* Change the video mode */
 182static unsigned int do_vmode_pan = 0;   /* Update the video mode */
 183static short do_blank = 0;              /* (Un)Blank the screen */
 184
 185static unsigned int is_blanked = 0;             /* Is the screen blanked? */
 186
 187#ifdef CONFIG_SH_STORE_QUEUES
 188static unsigned long pvr2fb_map;
 189#endif
 190
 191#ifdef CONFIG_SH_DMA
 192static unsigned int shdma = PVR2_CASCADE_CHAN;
 193static unsigned int pvr2dma = ONCHIP_NR_DMA_CHANNELS;
 194#endif
 195
 196static int pvr2fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue,
 197                            unsigned int transp, struct fb_info *info);
 198static int pvr2fb_blank(int blank, struct fb_info *info);
 199static unsigned long get_line_length(int xres_virtual, int bpp);
 200static void set_color_bitfields(struct fb_var_screeninfo *var);
 201static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info);
 202static int pvr2fb_set_par(struct fb_info *info);
 203static void pvr2_update_display(struct fb_info *info);
 204static void pvr2_init_display(struct fb_info *info);
 205static void pvr2_do_blank(void);
 206static irqreturn_t pvr2fb_interrupt(int irq, void *dev_id);
 207static int pvr2_init_cable(void);
 208static int pvr2_get_param(const struct pvr2_params *p, const char *s,
 209                            int val, int size);
 210#ifdef CONFIG_SH_DMA
 211static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
 212                            size_t count, loff_t *ppos);
 213#endif
 214
 215static struct fb_ops pvr2fb_ops = {
 216        .owner          = THIS_MODULE,
 217        .fb_setcolreg   = pvr2fb_setcolreg,
 218        .fb_blank       = pvr2fb_blank,
 219        .fb_check_var   = pvr2fb_check_var,
 220        .fb_set_par     = pvr2fb_set_par,
 221#ifdef CONFIG_SH_DMA
 222        .fb_write       = pvr2fb_write,
 223#endif
 224        .fb_fillrect    = cfb_fillrect,
 225        .fb_copyarea    = cfb_copyarea,
 226        .fb_imageblit   = cfb_imageblit,
 227};
 228
 229static struct fb_videomode pvr2_modedb[] __devinitdata = {
 230    /*
 231     * Broadcast video modes (PAL and NTSC).  I'm unfamiliar with
 232     * PAL-M and PAL-N, but from what I've read both modes parallel PAL and
 233     * NTSC, so it shouldn't be a problem (I hope).
 234     */
 235
 236    {
 237        /* 640x480 @ 60Hz interlaced (NTSC) */
 238        "ntsc_640x480i", 60, 640, 480, TV_CLK, 38, 33, 0, 18, 146, 26,
 239        FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
 240    }, {
 241        /* 640x240 @ 60Hz (NTSC) */
 242        /* XXX: Broken! Don't use... */
 243        "ntsc_640x240", 60, 640, 240, TV_CLK, 38, 33, 0, 0, 146, 22,
 244        FB_SYNC_BROADCAST, FB_VMODE_YWRAP
 245    }, {
 246        /* 640x480 @ 60hz (VGA) */
 247        "vga_640x480", 60, 640, 480, VGA_CLK, 38, 33, 0, 18, 146, 26,
 248        0, FB_VMODE_YWRAP
 249    },
 250};
 251
 252#define NUM_TOTAL_MODES  ARRAY_SIZE(pvr2_modedb)
 253
 254#define DEFMODE_NTSC    0
 255#define DEFMODE_PAL     0
 256#define DEFMODE_VGA     2
 257
 258static int defmode = DEFMODE_NTSC;
 259static char *mode_option __devinitdata = NULL;
 260
 261static inline void pvr2fb_set_pal_type(unsigned int type)
 262{
 263        struct pvr2fb_par *par = (struct pvr2fb_par *)fb_info->par;
 264
 265        fb_writel(type, par->mmio_base + 0x108);
 266}
 267
 268static inline void pvr2fb_set_pal_entry(struct pvr2fb_par *par,
 269                                        unsigned int regno,
 270                                        unsigned int val)
 271{
 272        fb_writel(val, par->mmio_base + 0x1000 + (4 * regno));
 273}
 274
 275static int pvr2fb_blank(int blank, struct fb_info *info)
 276{
 277        do_blank = blank ? blank : -1;
 278        return 0;
 279}
 280
 281static inline unsigned long get_line_length(int xres_virtual, int bpp)
 282{
 283        return (unsigned long)((((xres_virtual*bpp)+31)&~31) >> 3);
 284}
 285
 286static void set_color_bitfields(struct fb_var_screeninfo *var)
 287{
 288        switch (var->bits_per_pixel) {
 289            case 16:        /* RGB 565 */
 290                pvr2fb_set_pal_type(PAL_RGB565);
 291                var->red.offset = 11;    var->red.length = 5;
 292                var->green.offset = 5;   var->green.length = 6;
 293                var->blue.offset = 0;    var->blue.length = 5;
 294                var->transp.offset = 0;  var->transp.length = 0;
 295                break;
 296            case 24:        /* RGB 888 */
 297                var->red.offset = 16;    var->red.length = 8;
 298                var->green.offset = 8;   var->green.length = 8;
 299                var->blue.offset = 0;    var->blue.length = 8;
 300                var->transp.offset = 0;  var->transp.length = 0;
 301                break;
 302            case 32:        /* ARGB 8888 */
 303                pvr2fb_set_pal_type(PAL_ARGB8888);
 304                var->red.offset = 16;    var->red.length = 8;
 305                var->green.offset = 8;   var->green.length = 8;
 306                var->blue.offset = 0;    var->blue.length = 8;
 307                var->transp.offset = 24; var->transp.length = 8;
 308                break;
 309        }
 310}
 311
 312static int pvr2fb_setcolreg(unsigned int regno, unsigned int red,
 313                            unsigned int green, unsigned int blue,
 314                            unsigned int transp, struct fb_info *info)
 315{
 316        struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
 317        unsigned int tmp;
 318
 319        if (regno > info->cmap.len)
 320                return 1;
 321
 322        /*
 323         * We only support the hardware palette for 16 and 32bpp. It's also
 324         * expected that the palette format has been set by the time we get
 325         * here, so we don't waste time setting it again.
 326         */
 327        switch (info->var.bits_per_pixel) {
 328            case 16: /* RGB 565 */
 329                tmp =  (red   & 0xf800)       |
 330                      ((green & 0xfc00) >> 5) |
 331                      ((blue  & 0xf800) >> 11);
 332
 333                pvr2fb_set_pal_entry(par, regno, tmp);
 334                break;
 335            case 24: /* RGB 888 */
 336                red >>= 8; green >>= 8; blue >>= 8;
 337                tmp = (red << 16) | (green << 8) | blue;
 338                break;
 339            case 32: /* ARGB 8888 */
 340                red >>= 8; green >>= 8; blue >>= 8;
 341                tmp = (transp << 24) | (red << 16) | (green << 8) | blue;
 342
 343                pvr2fb_set_pal_entry(par, regno, tmp);
 344                break;
 345            default:
 346                pr_debug("Invalid bit depth %d?!?\n", info->var.bits_per_pixel);
 347                return 1;
 348        }
 349
 350        if (regno < 16)
 351                ((u32*)(info->pseudo_palette))[regno] = tmp;
 352
 353        return 0;
 354}
 355
 356static int pvr2fb_set_par(struct fb_info *info)
 357{
 358        struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
 359        struct fb_var_screeninfo *var = &info->var;
 360        unsigned long line_length;
 361        unsigned int vtotal;
 362
 363        /*
 364         * XXX: It's possible that a user could use a VGA box, change the cable
 365         * type in hardware (i.e. switch from VGA<->composite), then change
 366         * modes (i.e. switching to another VT).  If that happens we should
 367         * automagically change the output format to cope, but currently I
 368         * don't have a VGA box to make sure this works properly.
 369         */
 370        cable_type = pvr2_init_cable();
 371        if (cable_type == CT_VGA && video_output != VO_VGA)
 372                video_output = VO_VGA;
 373
 374        var->vmode &= FB_VMODE_MASK;
 375        if (var->vmode & FB_VMODE_INTERLACED && video_output != VO_VGA)
 376                par->is_interlaced = 1;
 377        /*
 378         * XXX: Need to be more creative with this (i.e. allow doublecan for
 379         * PAL/NTSC output).
 380         */
 381        if (var->vmode & FB_VMODE_DOUBLE && video_output == VO_VGA)
 382                par->is_doublescan = 1;
 383
 384        par->hsync_total = var->left_margin + var->xres + var->right_margin +
 385                           var->hsync_len;
 386        par->vsync_total = var->upper_margin + var->yres + var->lower_margin +
 387                           var->vsync_len;
 388
 389        if (var->sync & FB_SYNC_BROADCAST) {
 390                vtotal = par->vsync_total;
 391                if (par->is_interlaced)
 392                        vtotal /= 2;
 393                if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
 394                        /* XXX: Check for start values here... */
 395                        /* XXX: Check hardware for PAL-compatibility */
 396                        par->borderstart_h = 116;
 397                        par->borderstart_v = 44;
 398                } else {
 399                        /* NTSC video output */
 400                        par->borderstart_h = 126;
 401                        par->borderstart_v = 18;
 402                }
 403        } else {
 404                /* VGA mode */
 405                /* XXX: What else needs to be checked? */
 406                /*
 407                 * XXX: We have a little freedom in VGA modes, what ranges
 408                 * should be here (i.e. hsync/vsync totals, etc.)?
 409                 */
 410                par->borderstart_h = 126;
 411                par->borderstart_v = 40;
 412        }
 413
 414        /* Calculate the remainding offsets */
 415        par->diwstart_h = par->borderstart_h + var->left_margin;
 416        par->diwstart_v = par->borderstart_v + var->upper_margin;
 417        par->borderstop_h = par->diwstart_h + var->xres +
 418                            var->right_margin;
 419        par->borderstop_v = par->diwstart_v + var->yres +
 420                            var->lower_margin;
 421
 422        if (!par->is_interlaced)
 423                par->borderstop_v /= 2;
 424        if (info->var.xres < 640)
 425                par->is_lowres = 1;
 426
 427        line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
 428        par->disp_start = info->fix.smem_start + (line_length * var->yoffset) * line_length;
 429        info->fix.line_length = line_length;
 430        return 0;
 431}
 432
 433static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 434{
 435        struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
 436        unsigned int vtotal, hsync_total;
 437        unsigned long line_length;
 438
 439        if (var->pixclock != TV_CLK && var->pixclock != VGA_CLK) {
 440                pr_debug("Invalid pixclock value %d\n", var->pixclock);
 441                return -EINVAL;
 442        }
 443
 444        if (var->xres < 320)
 445                var->xres = 320;
 446        if (var->yres < 240)
 447                var->yres = 240;
 448        if (var->xres_virtual < var->xres)
 449                var->xres_virtual = var->xres;
 450        if (var->yres_virtual < var->yres)
 451                var->yres_virtual = var->yres;
 452
 453        if (var->bits_per_pixel <= 16)
 454                var->bits_per_pixel = 16;
 455        else if (var->bits_per_pixel <= 24)
 456                var->bits_per_pixel = 24;
 457        else if (var->bits_per_pixel <= 32)
 458                var->bits_per_pixel = 32;
 459
 460        set_color_bitfields(var);
 461
 462        if (var->vmode & FB_VMODE_YWRAP) {
 463                if (var->xoffset || var->yoffset < 0 ||
 464                    var->yoffset >= var->yres_virtual) {
 465                        var->xoffset = var->yoffset = 0;
 466                } else {
 467                        if (var->xoffset > var->xres_virtual - var->xres ||
 468                            var->yoffset > var->yres_virtual - var->yres ||
 469                            var->xoffset < 0 || var->yoffset < 0)
 470                                var->xoffset = var->yoffset = 0;
 471                }
 472        } else {
 473                var->xoffset = var->yoffset = 0;
 474        }
 475
 476        /*
 477         * XXX: Need to be more creative with this (i.e. allow doublecan for
 478         * PAL/NTSC output).
 479         */
 480        if (var->yres < 480 && video_output == VO_VGA)
 481                var->vmode |= FB_VMODE_DOUBLE;
 482
 483        if (video_output != VO_VGA) {
 484                var->sync |= FB_SYNC_BROADCAST;
 485                var->vmode |= FB_VMODE_INTERLACED;
 486        } else {
 487                var->sync &= ~FB_SYNC_BROADCAST;
 488                var->vmode &= ~FB_VMODE_INTERLACED;
 489                var->vmode |= FB_VMODE_NONINTERLACED;
 490        }
 491
 492        if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_TEST) {
 493                var->right_margin = par->borderstop_h -
 494                                   (par->diwstart_h + var->xres);
 495                var->left_margin  = par->diwstart_h - par->borderstart_h;
 496                var->hsync_len    = par->borderstart_h +
 497                                   (par->hsync_total - par->borderstop_h);
 498
 499                var->upper_margin = par->diwstart_v - par->borderstart_v;
 500                var->lower_margin = par->borderstop_v -
 501                                   (par->diwstart_v + var->yres);
 502                var->vsync_len    = par->borderstop_v +
 503                                   (par->vsync_total - par->borderstop_v);
 504        }
 505
 506        hsync_total = var->left_margin + var->xres + var->right_margin +
 507                      var->hsync_len;
 508        vtotal = var->upper_margin + var->yres + var->lower_margin +
 509                 var->vsync_len;
 510
 511        if (var->sync & FB_SYNC_BROADCAST) {
 512                if (var->vmode & FB_VMODE_INTERLACED)
 513                        vtotal /= 2;
 514                if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
 515                        /* PAL video output */
 516                        /* XXX: Should be using a range here ... ? */
 517                        if (hsync_total != PAL_HTOTAL) {
 518                                pr_debug("invalid hsync total for PAL\n");
 519                                return -EINVAL;
 520                        }
 521                } else {
 522                        /* NTSC video output */
 523                        if (hsync_total != NTSC_HTOTAL) {
 524                                pr_debug("invalid hsync total for NTSC\n");
 525                                return -EINVAL;
 526                        }
 527                }
 528        }
 529
 530        /* Check memory sizes */
 531        line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
 532        if (line_length * var->yres_virtual > info->fix.smem_len)
 533                return -ENOMEM;
 534
 535        return 0;
 536}
 537
 538static void pvr2_update_display(struct fb_info *info)
 539{
 540        struct pvr2fb_par *par = (struct pvr2fb_par *) info->par;
 541        struct fb_var_screeninfo *var = &info->var;
 542
 543        /* Update the start address of the display image */
 544        fb_writel(par->disp_start, DISP_DIWADDRL);
 545        fb_writel(par->disp_start +
 546                  get_line_length(var->xoffset+var->xres, var->bits_per_pixel),
 547                  DISP_DIWADDRS);
 548}
 549
 550/*
 551 * Initialize the video mode.  Currently, the 16bpp and 24bpp modes aren't
 552 * very stable.  It's probably due to the fact that a lot of the 2D video
 553 * registers are still undocumented.
 554 */
 555
 556static void pvr2_init_display(struct fb_info *info)
 557{
 558        struct pvr2fb_par *par = (struct pvr2fb_par *) info->par;
 559        struct fb_var_screeninfo *var = &info->var;
 560        unsigned int diw_height, diw_width, diw_modulo = 1;
 561        unsigned int bytesperpixel = var->bits_per_pixel >> 3;
 562
 563        /* hsync and vsync totals */
 564        fb_writel((par->vsync_total << 16) | par->hsync_total, DISP_SYNCSIZE);
 565
 566        /* column height, modulo, row width */
 567        /* since we're "panning" within vram, we need to offset things based
 568         * on the offset from the virtual x start to our real gfx. */
 569        if (video_output != VO_VGA && par->is_interlaced)
 570                diw_modulo += info->fix.line_length / 4;
 571        diw_height = (par->is_interlaced ? var->yres / 2 : var->yres);
 572        diw_width = get_line_length(var->xres, var->bits_per_pixel) / 4;
 573        fb_writel((diw_modulo << 20) | (--diw_height << 10) | --diw_width,
 574                  DISP_DIWSIZE);
 575
 576        /* display address, long and short fields */
 577        fb_writel(par->disp_start, DISP_DIWADDRL);
 578        fb_writel(par->disp_start +
 579                  get_line_length(var->xoffset+var->xres, var->bits_per_pixel),
 580                  DISP_DIWADDRS);
 581
 582        /* border horizontal, border vertical, border color */
 583        fb_writel((par->borderstart_h << 16) | par->borderstop_h, DISP_BRDRHORZ);
 584        fb_writel((par->borderstart_v << 16) | par->borderstop_v, DISP_BRDRVERT);
 585        fb_writel(0, DISP_BRDRCOLR);
 586
 587        /* display window start position */
 588        fb_writel(par->diwstart_h, DISP_DIWHSTRT);
 589        fb_writel((par->diwstart_v << 16) | par->diwstart_v, DISP_DIWVSTRT);
 590
 591        /* misc. settings */
 592        fb_writel((0x16 << 16) | par->is_lowres, DISP_DIWCONF);
 593
 594        /* clock doubler (for VGA), scan doubler, display enable */
 595        fb_writel(((video_output == VO_VGA) << 23) |
 596                  (par->is_doublescan << 1) | 1, DISP_DIWMODE);
 597
 598        /* bits per pixel */
 599        fb_writel(fb_readl(DISP_DIWMODE) | (--bytesperpixel << 2), DISP_DIWMODE);
 600        fb_writel(bytesperpixel << 2, DISP_PIXDEPTH);
 601
 602        /* video enable, color sync, interlace,
 603         * hsync and vsync polarity (currently unused) */
 604        fb_writel(0x100 | ((par->is_interlaced /*|4*/) << 4), DISP_SYNCCONF);
 605}
 606
 607/* Simulate blanking by making the border cover the entire screen */
 608
 609#define BLANK_BIT (1<<3)
 610
 611static void pvr2_do_blank(void)
 612{
 613        struct pvr2fb_par *par = currentpar;
 614        unsigned long diwconf;
 615
 616        diwconf = fb_readl(DISP_DIWCONF);
 617        if (do_blank > 0)
 618                fb_writel(diwconf | BLANK_BIT, DISP_DIWCONF);
 619        else
 620                fb_writel(diwconf & ~BLANK_BIT, DISP_DIWCONF);
 621
 622        is_blanked = do_blank > 0 ? do_blank : 0;
 623}
 624
 625static irqreturn_t pvr2fb_interrupt(int irq, void *dev_id)
 626{
 627        struct fb_info *info = dev_id;
 628
 629        if (do_vmode_pan || do_vmode_full)
 630                pvr2_update_display(info);
 631        if (do_vmode_full)
 632                pvr2_init_display(info);
 633        if (do_vmode_pan)
 634                do_vmode_pan = 0;
 635        if (do_vmode_full)
 636                do_vmode_full = 0;
 637        if (do_blank) {
 638                pvr2_do_blank();
 639                do_blank = 0;
 640        }
 641        return IRQ_HANDLED;
 642}
 643
 644/*
 645 * Determine the cable type and initialize the cable output format.  Don't do
 646 * anything if the cable type has been overidden (via "cable:XX").
 647 */
 648
 649#define PCTRA 0xff80002c
 650#define PDTRA 0xff800030
 651#define VOUTC 0xa0702c00
 652
 653static int pvr2_init_cable(void)
 654{
 655        if (cable_type < 0) {
 656                fb_writel((fb_readl(PCTRA) & 0xfff0ffff) | 0x000a0000,
 657                          PCTRA);
 658                cable_type = (fb_readw(PDTRA) >> 8) & 3;
 659        }
 660
 661        /* Now select the output format (either composite or other) */
 662        /* XXX: Save the previous val first, as this reg is also AICA
 663          related */
 664        if (cable_type == CT_COMPOSITE)
 665                fb_writel(3 << 8, VOUTC);
 666        else if (cable_type == CT_RGB)
 667                fb_writel(1 << 9, VOUTC);
 668        else
 669                fb_writel(0, VOUTC);
 670
 671        return cable_type;
 672}
 673
 674#ifdef CONFIG_SH_DMA
 675static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
 676                            size_t count, loff_t *ppos)
 677{
 678        unsigned long dst, start, end, len;
 679        unsigned int nr_pages;
 680        struct page **pages;
 681        int ret, i;
 682
 683        nr_pages = (count + PAGE_SIZE - 1) >> PAGE_SHIFT;
 684
 685        pages = kmalloc(nr_pages * sizeof(struct page *), GFP_KERNEL);
 686        if (!pages)
 687                return -ENOMEM;
 688
 689        down_read(&current->mm->mmap_sem);
 690        ret = get_user_pages(current, current->mm, (unsigned long)buf,
 691                             nr_pages, WRITE, 0, pages, NULL);
 692        up_read(&current->mm->mmap_sem);
 693
 694        if (ret < nr_pages) {
 695                nr_pages = ret;
 696                ret = -EINVAL;
 697                goto out_unmap;
 698        }
 699
 700        dma_configure_channel(shdma, 0x12c1);
 701
 702        dst   = (unsigned long)fb_info->screen_base + *ppos;
 703        start = (unsigned long)page_address(pages[0]);
 704        end   = (unsigned long)page_address(pages[nr_pages]);
 705        len   = nr_pages << PAGE_SHIFT;
 706
 707        /* Half-assed contig check */
 708        if (start + len == end) {
 709                /* As we do this in one shot, it's either all or nothing.. */
 710                if ((*ppos + len) > fb_info->fix.smem_len) {
 711                        ret = -ENOSPC;
 712                        goto out_unmap;
 713                }
 714
 715                dma_write(shdma, start, 0, len);
 716                dma_write(pvr2dma, 0, dst, len);
 717                dma_wait_for_completion(pvr2dma);
 718
 719                goto out;
 720        }
 721
 722        /* Not contiguous, writeout per-page instead.. */
 723        for (i = 0; i < nr_pages; i++, dst += PAGE_SIZE) {
 724                if ((*ppos + (i << PAGE_SHIFT)) > fb_info->fix.smem_len) {
 725                        ret = -ENOSPC;
 726                        goto out_unmap;
 727                }
 728
 729                dma_write_page(shdma, (unsigned long)page_address(pages[i]), 0);
 730                dma_write_page(pvr2dma, 0, dst);
 731                dma_wait_for_completion(pvr2dma);
 732        }
 733
 734out:
 735        *ppos += count;
 736        ret = count;
 737
 738out_unmap:
 739        for (i = 0; i < nr_pages; i++)
 740                page_cache_release(pages[i]);
 741
 742        kfree(pages);
 743
 744        return ret;
 745}
 746#endif /* CONFIG_SH_DMA */
 747
 748/**
 749 * pvr2fb_common_init
 750 *
 751 * Common init code for the PVR2 chips.
 752 *
 753 * This mostly takes care of the common aspects of the fb setup and
 754 * registration. It's expected that the board-specific init code has
 755 * already setup pvr2_fix with something meaningful at this point.
 756 *
 757 * Device info reporting is also done here, as well as picking a sane
 758 * default from the modedb. For board-specific modelines, simply define
 759 * a per-board modedb.
 760 *
 761 * Also worth noting is that the cable and video output types are likely
 762 * always going to be VGA for the PCI-based PVR2 boards, but we leave this
 763 * in for flexibility anyways. Who knows, maybe someone has tv-out on a
 764 * PCI-based version of these things ;-)
 765 */
 766static int __devinit pvr2fb_common_init(void)
 767{
 768        struct pvr2fb_par *par = currentpar;
 769        unsigned long modememused, rev;
 770
 771        fb_info->screen_base = ioremap_nocache(pvr2_fix.smem_start,
 772                                               pvr2_fix.smem_len);
 773
 774        if (!fb_info->screen_base) {
 775                printk(KERN_ERR "pvr2fb: Failed to remap smem space\n");
 776                goto out_err;
 777        }
 778
 779        par->mmio_base = (unsigned long)ioremap_nocache(pvr2_fix.mmio_start,
 780                                                        pvr2_fix.mmio_len);
 781        if (!par->mmio_base) {
 782                printk(KERN_ERR "pvr2fb: Failed to remap mmio space\n");
 783                goto out_err;
 784        }
 785
 786        fb_memset(fb_info->screen_base, 0, pvr2_fix.smem_len);
 787
 788        pvr2_fix.ypanstep       = nopan  ? 0 : 1;
 789        pvr2_fix.ywrapstep      = nowrap ? 0 : 1;
 790
 791        fb_info->fbops          = &pvr2fb_ops;
 792        fb_info->fix            = pvr2_fix;
 793        fb_info->par            = currentpar;
 794        fb_info->pseudo_palette = currentpar->palette;
 795        fb_info->flags          = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 796
 797        if (video_output == VO_VGA)
 798                defmode = DEFMODE_VGA;
 799
 800        if (!mode_option)
 801                mode_option = "640x480@60";
 802
 803        if (!fb_find_mode(&fb_info->var, fb_info, mode_option, pvr2_modedb,
 804                          NUM_TOTAL_MODES, &pvr2_modedb[defmode], 16))
 805                fb_info->var = pvr2_var;
 806
 807        fb_alloc_cmap(&fb_info->cmap, 256, 0);
 808
 809        if (register_framebuffer(fb_info) < 0)
 810                goto out_err;
 811        /*Must write PIXDEPTH to register before anything is displayed - so force init */
 812        pvr2_init_display(fb_info);
 813
 814        modememused = get_line_length(fb_info->var.xres_virtual,
 815                                      fb_info->var.bits_per_pixel);
 816        modememused *= fb_info->var.yres_virtual;
 817
 818        rev = fb_readl(par->mmio_base + 0x04);
 819
 820        printk("fb%d: %s (rev %ld.%ld) frame buffer device, using %ldk/%ldk of video memory\n",
 821               fb_info->node, fb_info->fix.id, (rev >> 4) & 0x0f, rev & 0x0f,
 822               modememused >> 10, (unsigned long)(fb_info->fix.smem_len >> 10));
 823        printk("fb%d: Mode %dx%d-%d pitch = %ld cable: %s video output: %s\n",
 824               fb_info->node, fb_info->var.xres, fb_info->var.yres,
 825               fb_info->var.bits_per_pixel,
 826               get_line_length(fb_info->var.xres, fb_info->var.bits_per_pixel),
 827               (char *)pvr2_get_param(cables, NULL, cable_type, 3),
 828               (char *)pvr2_get_param(outputs, NULL, video_output, 3));
 829
 830#ifdef CONFIG_SH_STORE_QUEUES
 831        printk(KERN_NOTICE "fb%d: registering with SQ API\n", fb_info->node);
 832
 833        pvr2fb_map = sq_remap(fb_info->fix.smem_start, fb_info->fix.smem_len,
 834                              fb_info->fix.id, pgprot_val(PAGE_SHARED));
 835
 836        printk(KERN_NOTICE "fb%d: Mapped video memory to SQ addr 0x%lx\n",
 837               fb_info->node, pvr2fb_map);
 838#endif
 839
 840        return 0;
 841
 842out_err:
 843        if (fb_info->screen_base)
 844                iounmap(fb_info->screen_base);
 845        if (par->mmio_base)
 846                iounmap((void *)par->mmio_base);
 847
 848        return -ENXIO;
 849}
 850
 851#ifdef CONFIG_SH_DREAMCAST
 852static int __init pvr2fb_dc_init(void)
 853{
 854        if (!mach_is_dreamcast())
 855                return -ENXIO;
 856
 857        /* Make a guess at the monitor based on the attached cable */
 858        if (pvr2_init_cable() == CT_VGA) {
 859                fb_info->monspecs.hfmin = 30000;
 860                fb_info->monspecs.hfmax = 70000;
 861                fb_info->monspecs.vfmin = 60;
 862                fb_info->monspecs.vfmax = 60;
 863        } else {
 864                /* Not VGA, using a TV (taken from acornfb) */
 865                fb_info->monspecs.hfmin = 15469;
 866                fb_info->monspecs.hfmax = 15781;
 867                fb_info->monspecs.vfmin = 49;
 868                fb_info->monspecs.vfmax = 51;
 869        }
 870
 871        /*
 872         * XXX: This needs to pull default video output via BIOS or other means
 873         */
 874        if (video_output < 0) {
 875                if (cable_type == CT_VGA) {
 876                        video_output = VO_VGA;
 877                } else {
 878                        video_output = VO_NTSC;
 879                }
 880        }
 881
 882        /*
 883         * Nothing exciting about the DC PVR2 .. only a measly 8MiB.
 884         */
 885        pvr2_fix.smem_start     = 0xa5000000;   /* RAM starts here */
 886        pvr2_fix.smem_len       = 8 << 20;
 887
 888        pvr2_fix.mmio_start     = 0xa05f8000;   /* registers start here */
 889        pvr2_fix.mmio_len       = 0x2000;
 890
 891        if (request_irq(HW_EVENT_VSYNC, pvr2fb_interrupt, IRQF_SHARED,
 892                        "pvr2 VBL handler", fb_info)) {
 893                return -EBUSY;
 894        }
 895
 896#ifdef CONFIG_SH_DMA
 897        if (request_dma(pvr2dma, "pvr2") != 0) {
 898                free_irq(HW_EVENT_VSYNC, 0);
 899                return -EBUSY;
 900        }
 901#endif
 902
 903        return pvr2fb_common_init();
 904}
 905
 906static void __exit pvr2fb_dc_exit(void)
 907{
 908        if (fb_info->screen_base) {
 909                iounmap(fb_info->screen_base);
 910                fb_info->screen_base = NULL;
 911        }
 912        if (currentpar->mmio_base) {
 913                iounmap((void *)currentpar->mmio_base);
 914                currentpar->mmio_base = 0;
 915        }
 916
 917        free_irq(HW_EVENT_VSYNC, 0);
 918#ifdef CONFIG_SH_DMA
 919        free_dma(pvr2dma);
 920#endif
 921}
 922#endif /* CONFIG_SH_DREAMCAST */
 923
 924#ifdef CONFIG_PCI
 925static int __devinit pvr2fb_pci_probe(struct pci_dev *pdev,
 926                                      const struct pci_device_id *ent)
 927{
 928        int ret;
 929
 930        ret = pci_enable_device(pdev);
 931        if (ret) {
 932                printk(KERN_ERR "pvr2fb: PCI enable failed\n");
 933                return ret;
 934        }
 935
 936        ret = pci_request_regions(pdev, "pvr2fb");
 937        if (ret) {
 938                printk(KERN_ERR "pvr2fb: PCI request regions failed\n");
 939                return ret;
 940        }
 941
 942        /*
 943         * Slightly more exciting than the DC PVR2 .. 16MiB!
 944         */
 945        pvr2_fix.smem_start     = pci_resource_start(pdev, 0);
 946        pvr2_fix.smem_len       = pci_resource_len(pdev, 0);
 947
 948        pvr2_fix.mmio_start     = pci_resource_start(pdev, 1);
 949        pvr2_fix.mmio_len       = pci_resource_len(pdev, 1);
 950
 951        fb_info->device         = &pdev->dev;
 952
 953        return pvr2fb_common_init();
 954}
 955
 956static void __devexit pvr2fb_pci_remove(struct pci_dev *pdev)
 957{
 958        if (fb_info->screen_base) {
 959                iounmap(fb_info->screen_base);
 960                fb_info->screen_base = NULL;
 961        }
 962        if (currentpar->mmio_base) {
 963                iounmap((void *)currentpar->mmio_base);
 964                currentpar->mmio_base = 0;
 965        }
 966
 967        pci_release_regions(pdev);
 968}
 969
 970static struct pci_device_id pvr2fb_pci_tbl[] __devinitdata = {
 971        { PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_NEON250,
 972          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 973        { 0, },
 974};
 975
 976MODULE_DEVICE_TABLE(pci, pvr2fb_pci_tbl);
 977
 978static struct pci_driver pvr2fb_pci_driver = {
 979        .name           = "pvr2fb",
 980        .id_table       = pvr2fb_pci_tbl,
 981        .probe          = pvr2fb_pci_probe,
 982        .remove         = __devexit_p(pvr2fb_pci_remove),
 983};
 984
 985static int __init pvr2fb_pci_init(void)
 986{
 987        return pci_register_driver(&pvr2fb_pci_driver);
 988}
 989
 990static void __exit pvr2fb_pci_exit(void)
 991{
 992        pci_unregister_driver(&pvr2fb_pci_driver);
 993}
 994#endif /* CONFIG_PCI */
 995
 996static int __devinit pvr2_get_param(const struct pvr2_params *p, const char *s,
 997                                   int val, int size)
 998{
 999        int i;
1000
1001        for (i = 0 ; i < size ; i++ ) {
1002                if (s != NULL) {
1003                        if (!strnicmp(p[i].name, s, strlen(s)))
1004                                return p[i].val;
1005                } else {
1006                        if (p[i].val == val)
1007                                return (int)p[i].name;
1008                }
1009        }
1010        return -1;
1011}
1012
1013/*
1014 * Parse command arguments.  Supported arguments are:
1015 *    inverse                             Use inverse color maps
1016 *    cable:composite|rgb|vga             Override the video cable type
1017 *    output:NTSC|PAL|VGA                 Override the video output format
1018 *
1019 *    <xres>x<yres>[-<bpp>][@<refresh>]   or,
1020 *    <name>[-<bpp>][@<refresh>]          Startup using this video mode
1021 */
1022
1023#ifndef MODULE
1024static int __init pvr2fb_setup(char *options)
1025{
1026        char *this_opt;
1027        char cable_arg[80];
1028        char output_arg[80];
1029
1030        if (!options || !*options)
1031                return 0;
1032
1033        while ((this_opt = strsep(&options, ","))) {
1034                if (!*this_opt)
1035                        continue;
1036                if (!strcmp(this_opt, "inverse")) {
1037                        fb_invert_cmaps();
1038                } else if (!strncmp(this_opt, "cable:", 6)) {
1039                        strcpy(cable_arg, this_opt + 6);
1040                } else if (!strncmp(this_opt, "output:", 7)) {
1041                        strcpy(output_arg, this_opt + 7);
1042                } else if (!strncmp(this_opt, "nopan", 5)) {
1043                        nopan = 1;
1044                } else if (!strncmp(this_opt, "nowrap", 6)) {
1045                        nowrap = 1;
1046                } else {
1047                        mode_option = this_opt;
1048                }
1049        }
1050
1051        if (*cable_arg)
1052                cable_type = pvr2_get_param(cables, cable_arg, 0, 3);
1053        if (*output_arg)
1054                video_output = pvr2_get_param(outputs, output_arg, 0, 3);
1055
1056        return 0;
1057}
1058#endif
1059
1060static struct pvr2_board {
1061        int (*init)(void);
1062        void (*exit)(void);
1063        char name[16];
1064} board_driver[] = {
1065#ifdef CONFIG_SH_DREAMCAST
1066        { pvr2fb_dc_init, pvr2fb_dc_exit, "Sega DC PVR2" },
1067#endif
1068#ifdef CONFIG_PCI
1069        { pvr2fb_pci_init, pvr2fb_pci_exit, "PCI PVR2" },
1070#endif
1071        { 0, },
1072};
1073
1074static int __init pvr2fb_init(void)
1075{
1076        int i, ret = -ENODEV;
1077        int size;
1078
1079#ifndef MODULE
1080        char *option = NULL;
1081
1082        if (fb_get_options("pvr2fb", &option))
1083                return -ENODEV;
1084        pvr2fb_setup(option);
1085#endif
1086        size = sizeof(struct fb_info) + sizeof(struct pvr2fb_par) + 16 * sizeof(u32);
1087
1088        fb_info = framebuffer_alloc(sizeof(struct pvr2fb_par), NULL);
1089
1090        if (!fb_info) {
1091                printk(KERN_ERR "Failed to allocate memory for fb_info\n");
1092                return -ENOMEM;
1093        }
1094
1095
1096        currentpar = fb_info->par;
1097
1098        for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
1099                struct pvr2_board *pvr_board = board_driver + i;
1100
1101                if (!pvr_board->init)
1102                        continue;
1103
1104                ret = pvr_board->init();
1105
1106                if (ret != 0) {
1107                        printk(KERN_ERR "pvr2fb: Failed init of %s device\n",
1108                                pvr_board->name);
1109                        framebuffer_release(fb_info);
1110                        break;
1111                }
1112        }
1113
1114        return ret;
1115}
1116
1117static void __exit pvr2fb_exit(void)
1118{
1119        int i;
1120
1121        for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
1122                struct pvr2_board *pvr_board = board_driver + i;
1123
1124                if (pvr_board->exit)
1125                        pvr_board->exit();
1126        }
1127
1128#ifdef CONFIG_SH_STORE_QUEUES
1129        sq_unmap(pvr2fb_map);
1130#endif
1131
1132        unregister_framebuffer(fb_info);
1133        framebuffer_release(fb_info);
1134}
1135
1136module_init(pvr2fb_init);
1137module_exit(pvr2fb_exit);
1138
1139MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, M. R. Brown <mrbrown@0xd6.org>");
1140MODULE_DESCRIPTION("Framebuffer driver for NEC PowerVR 2 based graphics boards");
1141MODULE_LICENSE("GPL");
1142
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