linux/drivers/video/fbdev/geode/gxfb_core.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Geode GX framebuffer driver.
   4 *
   5 *   Copyright (C) 2006 Arcom Control Systems Ltd.
   6 *
   7 * This driver assumes that the BIOS has created a virtual PCI device header
   8 * for the video device. The PCI header is assumed to contain the following
   9 * BARs:
  10 *
  11 *    BAR0 - framebuffer memory
  12 *    BAR1 - graphics processor registers
  13 *    BAR2 - display controller registers
  14 *    BAR3 - video processor and flat panel control registers.
  15 *
  16 * 16 MiB of framebuffer memory is assumed to be available.
  17 */
  18#include <linux/module.h>
  19#include <linux/kernel.h>
  20#include <linux/errno.h>
  21#include <linux/string.h>
  22#include <linux/mm.h>
  23#include <linux/delay.h>
  24#include <linux/fb.h>
  25#include <linux/console.h>
  26#include <linux/suspend.h>
  27#include <linux/init.h>
  28#include <linux/pci.h>
  29#include <linux/cs5535.h>
  30
  31#include <asm/olpc.h>
  32
  33#include "gxfb.h"
  34
  35static char *mode_option;
  36static int vram;
  37static int vt_switch;
  38
  39/* Modes relevant to the GX (taken from modedb.c) */
  40static struct fb_videomode gx_modedb[] = {
  41        /* 640x480-60 VESA */
  42        { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  43          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  44        /* 640x480-75 VESA */
  45        { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  46          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  47        /* 640x480-85 VESA */
  48        { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  49          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  50        /* 800x600-60 VESA */
  51        { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  52          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  53          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  54        /* 800x600-75 VESA */
  55        { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  56          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  57          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  58        /* 800x600-85 VESA */
  59        { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  60          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  61          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  62        /* 1024x768-60 VESA */
  63        { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  64          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  65        /* 1024x768-75 VESA */
  66        { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  67          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  68          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  69        /* 1024x768-85 VESA */
  70        { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  71          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  72          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  73        /* 1280x960-60 VESA */
  74        { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  75          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  76          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  77        /* 1280x960-85 VESA */
  78        { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  79          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  80          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  81        /* 1280x1024-60 VESA */
  82        { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  83          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  84          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  85        /* 1280x1024-75 VESA */
  86        { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  87          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  88          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  89        /* 1280x1024-85 VESA */
  90        { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  91          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  92          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  93        /* 1600x1200-60 VESA */
  94        { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
  95          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  96          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  97        /* 1600x1200-75 VESA */
  98        { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
  99          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 100          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 101        /* 1600x1200-85 VESA */
 102        { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 103          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 104          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 105};
 106
 107static struct fb_videomode gx_dcon_modedb[] = {
 108        /* The only mode the DCON has is 1200x900 */
 109        { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
 110          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 111          FB_VMODE_NONINTERLACED, 0 }
 112};
 113
 114static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
 115{
 116        if (olpc_has_dcon()) {
 117                *modedb = (struct fb_videomode *) gx_dcon_modedb;
 118                *size = ARRAY_SIZE(gx_dcon_modedb);
 119        } else {
 120                *modedb = (struct fb_videomode *) gx_modedb;
 121                *size = ARRAY_SIZE(gx_modedb);
 122        }
 123}
 124
 125static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 126{
 127        if (var->xres > 1600 || var->yres > 1200)
 128                return -EINVAL;
 129        if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
 130                return -EINVAL;
 131
 132        if (var->bits_per_pixel == 32) {
 133                var->red.offset   = 16; var->red.length   = 8;
 134                var->green.offset =  8; var->green.length = 8;
 135                var->blue.offset  =  0; var->blue.length  = 8;
 136        } else if (var->bits_per_pixel == 16) {
 137                var->red.offset   = 11; var->red.length   = 5;
 138                var->green.offset =  5; var->green.length = 6;
 139                var->blue.offset  =  0; var->blue.length  = 5;
 140        } else if (var->bits_per_pixel == 8) {
 141                var->red.offset   = 0; var->red.length   = 8;
 142                var->green.offset = 0; var->green.length = 8;
 143                var->blue.offset  = 0; var->blue.length  = 8;
 144        } else
 145                return -EINVAL;
 146        var->transp.offset = 0; var->transp.length = 0;
 147
 148        /* Enough video memory? */
 149        if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 150                return -EINVAL;
 151
 152        /* FIXME: Check timing parameters here? */
 153
 154        return 0;
 155}
 156
 157static int gxfb_set_par(struct fb_info *info)
 158{
 159        if (info->var.bits_per_pixel > 8)
 160                info->fix.visual = FB_VISUAL_TRUECOLOR;
 161        else
 162                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 163
 164        info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
 165
 166        gx_set_mode(info);
 167
 168        return 0;
 169}
 170
 171static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 172{
 173        chan &= 0xffff;
 174        chan >>= 16 - bf->length;
 175        return chan << bf->offset;
 176}
 177
 178static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 179                           unsigned blue, unsigned transp,
 180                           struct fb_info *info)
 181{
 182        if (info->var.grayscale) {
 183                /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 184                red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 185        }
 186
 187        /* Truecolor has hardware independent palette */
 188        if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 189                u32 *pal = info->pseudo_palette;
 190                u32 v;
 191
 192                if (regno >= 16)
 193                        return -EINVAL;
 194
 195                v  = chan_to_field(red, &info->var.red);
 196                v |= chan_to_field(green, &info->var.green);
 197                v |= chan_to_field(blue, &info->var.blue);
 198
 199                pal[regno] = v;
 200        } else {
 201                if (regno >= 256)
 202                        return -EINVAL;
 203
 204                gx_set_hw_palette_reg(info, regno, red, green, blue);
 205        }
 206
 207        return 0;
 208}
 209
 210static int gxfb_blank(int blank_mode, struct fb_info *info)
 211{
 212        return gx_blank_display(info, blank_mode);
 213}
 214
 215static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 216{
 217        struct gxfb_par *par = info->par;
 218        int ret;
 219
 220        ret = pci_enable_device(dev);
 221        if (ret < 0)
 222                return ret;
 223
 224        ret = pci_request_region(dev, 3, "gxfb (video processor)");
 225        if (ret < 0)
 226                return ret;
 227        par->vid_regs = pci_ioremap_bar(dev, 3);
 228        if (!par->vid_regs)
 229                return -ENOMEM;
 230
 231        ret = pci_request_region(dev, 2, "gxfb (display controller)");
 232        if (ret < 0)
 233                return ret;
 234        par->dc_regs = pci_ioremap_bar(dev, 2);
 235        if (!par->dc_regs)
 236                return -ENOMEM;
 237
 238        ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
 239        if (ret < 0)
 240                return ret;
 241        par->gp_regs = pci_ioremap_bar(dev, 1);
 242
 243        if (!par->gp_regs)
 244                return -ENOMEM;
 245
 246        ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
 247        if (ret < 0)
 248                return ret;
 249
 250        info->fix.smem_start = pci_resource_start(dev, 0);
 251        info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
 252        info->screen_base = ioremap_wc(info->fix.smem_start,
 253                                       info->fix.smem_len);
 254        if (!info->screen_base)
 255                return -ENOMEM;
 256
 257        /* Set the 16MiB aligned base address of the graphics memory region
 258         * in the display controller */
 259
 260        write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
 261
 262        dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
 263                 info->fix.smem_len / 1024, info->fix.smem_start);
 264
 265        return 0;
 266}
 267
 268static const struct fb_ops gxfb_ops = {
 269        .owner          = THIS_MODULE,
 270        .fb_check_var   = gxfb_check_var,
 271        .fb_set_par     = gxfb_set_par,
 272        .fb_setcolreg   = gxfb_setcolreg,
 273        .fb_blank       = gxfb_blank,
 274        /* No HW acceleration for now. */
 275        .fb_fillrect    = cfb_fillrect,
 276        .fb_copyarea    = cfb_copyarea,
 277        .fb_imageblit   = cfb_imageblit,
 278};
 279
 280static struct fb_info *gxfb_init_fbinfo(struct device *dev)
 281{
 282        struct gxfb_par *par;
 283        struct fb_info *info;
 284
 285        /* Alloc enough space for the pseudo palette. */
 286        info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
 287                        dev);
 288        if (!info)
 289                return NULL;
 290
 291        par = info->par;
 292
 293        strcpy(info->fix.id, "Geode GX");
 294
 295        info->fix.type          = FB_TYPE_PACKED_PIXELS;
 296        info->fix.type_aux      = 0;
 297        info->fix.xpanstep      = 0;
 298        info->fix.ypanstep      = 0;
 299        info->fix.ywrapstep     = 0;
 300        info->fix.accel         = FB_ACCEL_NONE;
 301
 302        info->var.nonstd        = 0;
 303        info->var.activate      = FB_ACTIVATE_NOW;
 304        info->var.height        = -1;
 305        info->var.width = -1;
 306        info->var.accel_flags = 0;
 307        info->var.vmode = FB_VMODE_NONINTERLACED;
 308
 309        info->fbops             = &gxfb_ops;
 310        info->flags             = FBINFO_DEFAULT;
 311        info->node              = -1;
 312
 313        info->pseudo_palette    = (void *)par + sizeof(struct gxfb_par);
 314
 315        info->var.grayscale     = 0;
 316
 317        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 318                framebuffer_release(info);
 319                return NULL;
 320        }
 321
 322        return info;
 323}
 324
 325#ifdef CONFIG_PM
 326static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state)
 327{
 328        struct fb_info *info = pci_get_drvdata(pdev);
 329
 330        if (state.event == PM_EVENT_SUSPEND) {
 331                console_lock();
 332                gx_powerdown(info);
 333                fb_set_suspend(info, 1);
 334                console_unlock();
 335        }
 336
 337        /* there's no point in setting PCI states; we emulate PCI, so
 338         * we don't end up getting power savings anyways */
 339
 340        return 0;
 341}
 342
 343static int gxfb_resume(struct pci_dev *pdev)
 344{
 345        struct fb_info *info = pci_get_drvdata(pdev);
 346        int ret;
 347
 348        console_lock();
 349        ret = gx_powerup(info);
 350        if (ret) {
 351                printk(KERN_ERR "gxfb:  power up failed!\n");
 352                return ret;
 353        }
 354
 355        fb_set_suspend(info, 0);
 356        console_unlock();
 357        return 0;
 358}
 359#endif
 360
 361static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 362{
 363        struct gxfb_par *par;
 364        struct fb_info *info;
 365        int ret;
 366        unsigned long val;
 367
 368        struct fb_videomode *modedb_ptr;
 369        unsigned int modedb_size;
 370
 371        info = gxfb_init_fbinfo(&pdev->dev);
 372        if (!info)
 373                return -ENOMEM;
 374        par = info->par;
 375
 376        if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
 377                dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 378                goto err;
 379        }
 380
 381        /* Figure out if this is a TFT or CRT part */
 382
 383        rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
 384
 385        if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
 386                par->enable_crt = 0;
 387        else
 388                par->enable_crt = 1;
 389
 390        get_modedb(&modedb_ptr, &modedb_size);
 391        ret = fb_find_mode(&info->var, info, mode_option,
 392                           modedb_ptr, modedb_size, NULL, 16);
 393        if (ret == 0 || ret == 4) {
 394                dev_err(&pdev->dev, "could not find valid video mode\n");
 395                ret = -EINVAL;
 396                goto err;
 397        }
 398
 399
 400        /* Clear the frame buffer of garbage. */
 401        memset_io(info->screen_base, 0, info->fix.smem_len);
 402
 403        gxfb_check_var(&info->var, info);
 404        gxfb_set_par(info);
 405
 406        pm_set_vt_switch(vt_switch);
 407
 408        if (register_framebuffer(info) < 0) {
 409                ret = -EINVAL;
 410                goto err;
 411        }
 412        pci_set_drvdata(pdev, info);
 413        fb_info(info, "%s frame buffer device\n", info->fix.id);
 414        return 0;
 415
 416  err:
 417        if (info->screen_base) {
 418                iounmap(info->screen_base);
 419                pci_release_region(pdev, 0);
 420        }
 421        if (par->vid_regs) {
 422                iounmap(par->vid_regs);
 423                pci_release_region(pdev, 3);
 424        }
 425        if (par->dc_regs) {
 426                iounmap(par->dc_regs);
 427                pci_release_region(pdev, 2);
 428        }
 429        if (par->gp_regs) {
 430                iounmap(par->gp_regs);
 431                pci_release_region(pdev, 1);
 432        }
 433
 434        fb_dealloc_cmap(&info->cmap);
 435        framebuffer_release(info);
 436        return ret;
 437}
 438
 439static void gxfb_remove(struct pci_dev *pdev)
 440{
 441        struct fb_info *info = pci_get_drvdata(pdev);
 442        struct gxfb_par *par = info->par;
 443
 444        unregister_framebuffer(info);
 445
 446        iounmap((void __iomem *)info->screen_base);
 447        pci_release_region(pdev, 0);
 448
 449        iounmap(par->vid_regs);
 450        pci_release_region(pdev, 3);
 451
 452        iounmap(par->dc_regs);
 453        pci_release_region(pdev, 2);
 454
 455        iounmap(par->gp_regs);
 456        pci_release_region(pdev, 1);
 457
 458        fb_dealloc_cmap(&info->cmap);
 459
 460        framebuffer_release(info);
 461}
 462
 463static const struct pci_device_id gxfb_id_table[] = {
 464        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 465        { 0, }
 466};
 467
 468MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 469
 470static struct pci_driver gxfb_driver = {
 471        .name           = "gxfb",
 472        .id_table       = gxfb_id_table,
 473        .probe          = gxfb_probe,
 474        .remove         = gxfb_remove,
 475#ifdef CONFIG_PM
 476        .suspend        = gxfb_suspend,
 477        .resume         = gxfb_resume,
 478#endif
 479};
 480
 481#ifndef MODULE
 482static int __init gxfb_setup(char *options)
 483{
 484
 485        char *opt;
 486
 487        if (!options || !*options)
 488                return 0;
 489
 490        while ((opt = strsep(&options, ",")) != NULL) {
 491                if (!*opt)
 492                        continue;
 493
 494                mode_option = opt;
 495        }
 496
 497        return 0;
 498}
 499#endif
 500
 501static int __init gxfb_init(void)
 502{
 503#ifndef MODULE
 504        char *option = NULL;
 505
 506        if (fb_get_options("gxfb", &option))
 507                return -ENODEV;
 508
 509        gxfb_setup(option);
 510#endif
 511        return pci_register_driver(&gxfb_driver);
 512}
 513
 514static void __exit gxfb_cleanup(void)
 515{
 516        pci_unregister_driver(&gxfb_driver);
 517}
 518
 519module_init(gxfb_init);
 520module_exit(gxfb_cleanup);
 521
 522module_param(mode_option, charp, 0);
 523MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 524
 525module_param(vram, int, 0);
 526MODULE_PARM_DESC(vram, "video memory size");
 527
 528module_param(vt_switch, int, 0);
 529MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
 530
 531MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 532MODULE_LICENSE("GPL");
 533