drivers/video/fbdev/via/via-core.c

   1 /*
   2  * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
   3  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
   4  * Copyright 2009 Jonathan Corbet <corbet@lwn.net>
   5  */
   6
   7 /*
   8  * Core code for the Via multifunction framebuffer device.
   9  */
  10 #include <linux/via-core.h>
  11 #include <linux/via_i2c.h>
  12 #include <linux/via-gpio.h>
  13 #include "global.h"
  14
  15 #include <linux/module.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/list.h>
  19 #include <linux/pm.h>
  20 #include <asm/olpc.h>
  21
  22 /*
  23  * The default port config.
  24  */
  25 static struct via_port_cfg adap_configs[] = {
  26         [VIA_PORT_26]   = { VIA_PORT_I2C,  VIA_MODE_I2C, VIASR, 0x26 },
  27         [VIA_PORT_31]   = { VIA_PORT_I2C,  VIA_MODE_I2C, VIASR, 0x31 },
  28         [VIA_PORT_25]   = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
  29         [VIA_PORT_2C]   = { VIA_PORT_GPIO, VIA_MODE_I2C, VIASR, 0x2c },
  30         [VIA_PORT_3D]   = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
  31         { 0, 0, 0, 0 }
  32 };
  33
  34 /*
  35  * The OLPC XO-1.5 puts the camera power and reset lines onto
  36  * GPIO 2C.
  37  */
  38 static struct via_port_cfg olpc_adap_configs[] = {
  39         [VIA_PORT_26]   = { VIA_PORT_I2C,  VIA_MODE_I2C, VIASR, 0x26 },
  40         [VIA_PORT_31]   = { VIA_PORT_I2C,  VIA_MODE_I2C, VIASR, 0x31 },
  41         [VIA_PORT_25]   = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
  42         [VIA_PORT_2C]   = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x2c },
  43         [VIA_PORT_3D]   = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
  44         { 0, 0, 0, 0 }
  45 };
  46
  47 /*
  48  * We currently only support one viafb device (will there ever be
  49  * more than one?), so just declare it globally here.
  50  */
  51 static struct viafb_dev global_dev;
  52
  53
  54 /*
  55  * Basic register access; spinlock required.
  56  */
  57 static inline void viafb_mmio_write(int reg, u32 v)
  58 {
  59         iowrite32(v, global_dev.engine_mmio + reg);
  60 }
  61
  62 static inline int viafb_mmio_read(int reg)
  63 {
  64         return ioread32(global_dev.engine_mmio + reg);
  65 }
  66
  67 /* ---------------------------------------------------------------------- */
  68 /*
  69  * Interrupt management.  We have a single IRQ line for a lot of
  70  * different functions, so we need to share it.  The design here
  71  * is that we don't want to reimplement the shared IRQ code here;
  72  * we also want to avoid having contention for a single handler thread.
  73  * So each subdev driver which needs interrupts just requests
  74  * them directly from the kernel.  We just have what's needed for
  75  * overall access to the interrupt control register.
  76  */
  77
  78 /*
  79  * Which interrupts are enabled now?
  80  */
  81 static u32 viafb_enabled_ints;
  82
  83 static void viafb_int_init(void)
  84 {
  85         viafb_enabled_ints = 0;
  86
  87         viafb_mmio_write(VDE_INTERRUPT, 0);
  88 }
  89
  90 /*
  91  * Allow subdevs to ask for specific interrupts to be enabled.  These
  92  * functions must be called with reg_lock held
  93  */
  94 void viafb_irq_enable(u32 mask)
  95 {
  96         viafb_enabled_ints |= mask;
  97         viafb_mmio_write(VDE_INTERRUPT, viafb_enabled_ints | VDE_I_ENABLE);
  98 }
  99 EXPORT_SYMBOL_GPL(viafb_irq_enable);
 100
 101 void viafb_irq_disable(u32 mask)
 102 {
 103         viafb_enabled_ints &= ~mask;
 104         if (viafb_enabled_ints == 0)
 105                 viafb_mmio_write(VDE_INTERRUPT, 0);  /* Disable entirely */
 106         else
 107                 viafb_mmio_write(VDE_INTERRUPT,
 108                                 viafb_enabled_ints | VDE_I_ENABLE);
 109 }
 110 EXPORT_SYMBOL_GPL(viafb_irq_disable);
 111
 112 /* ---------------------------------------------------------------------- */
 113 /*
 114  * Currently, the camera driver is the only user of the DMA code, so we
 115  * only compile it in if the camera driver is being built.  Chances are,
 116  * most viafb systems will not need to have this extra code for a while.
 117  * As soon as another user comes long, the ifdef can be removed.
 118  */
 119 #if IS_ENABLED(CONFIG_VIDEO_VIA_CAMERA)
 120 /*
 121  * Access to the DMA engine.  This currently provides what the camera
 122  * driver needs (i.e. outgoing only) but is easily expandable if need
 123  * be.
 124  */
 125
 126 /*
 127  * There are four DMA channels in the vx855.  For now, we only
 128  * use one of them, though.  Most of the time, the DMA channel
 129  * will be idle, so we keep the IRQ handler unregistered except
 130  * when some subsystem has indicated an interest.
 131  */
 132 static int viafb_dma_users;
 133 static DECLARE_COMPLETION(viafb_dma_completion);
 134 /*
 135  * This mutex protects viafb_dma_users and our global interrupt
 136  * registration state; it also serializes access to the DMA
 137  * engine.
 138  */
 139 static DEFINE_MUTEX(viafb_dma_lock);
 140
 141 /*
 142  * The VX855 DMA descriptor (used for s/g transfers) looks
 143  * like this.
 144  */
 145 struct viafb_vx855_dma_descr {
 146         u32     addr_low;       /* Low part of phys addr */
 147         u32     addr_high;      /* High 12 bits of addr */
 148         u32     fb_offset;      /* Offset into FB memory */
 149         u32     seg_size;       /* Size, 16-byte units */
 150         u32     tile_mode;      /* "tile mode" setting */
 151         u32     next_desc_low;  /* Next descriptor addr */
 152         u32     next_desc_high;
 153         u32     pad;            /* Fill out to 64 bytes */
 154 };
 155
 156 /*
 157  * Flags added to the "next descriptor low" pointers
 158  */
 159 #define VIAFB_DMA_MAGIC         0x01  /* ??? Just has to be there */
 160 #define VIAFB_DMA_FINAL_SEGMENT 0x02  /* Final segment */
 161
 162 /*
 163  * The completion IRQ handler.
 164  */
 165 static irqreturn_t viafb_dma_irq(int irq, void *data)
 166 {
 167         int csr;
 168         irqreturn_t ret = IRQ_NONE;
 169
 170         spin_lock(&global_dev.reg_lock);
 171         csr = viafb_mmio_read(VDMA_CSR0);
 172         if (csr & VDMA_C_DONE) {
 173                 viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
 174                 complete(&viafb_dma_completion);
 175                 ret = IRQ_HANDLED;
 176         }
 177         spin_unlock(&global_dev.reg_lock);
 178         return ret;
 179 }
 180
 181 /*
 182  * Indicate a need for DMA functionality.
 183  */
 184 int viafb_request_dma(void)
 185 {
 186         int ret = 0;
 187
 188         /*
 189          * Only VX855 is supported currently.
 190          */
 191         if (global_dev.chip_type != UNICHROME_VX855)
 192                 return -ENODEV;
 193         /*
 194          * Note the new user and set up our interrupt handler
 195          * if need be.
 196          */
 197         mutex_lock(&viafb_dma_lock);
 198         viafb_dma_users++;
 199         if (viafb_dma_users == 1) {
 200                 ret = request_irq(global_dev.pdev->irq, viafb_dma_irq,
 201                                 IRQF_SHARED, "via-dma", &viafb_dma_users);
 202                 if (ret)
 203                         viafb_dma_users--;
 204                 else
 205                         viafb_irq_enable(VDE_I_DMA0TDEN);
 206         }
 207         mutex_unlock(&viafb_dma_lock);
 208         return ret;
 209 }
 210 EXPORT_SYMBOL_GPL(viafb_request_dma);
 211
 212 void viafb_release_dma(void)
 213 {
 214         mutex_lock(&viafb_dma_lock);
 215         viafb_dma_users--;
 216         if (viafb_dma_users == 0) {
 217                 viafb_irq_disable(VDE_I_DMA0TDEN);
 218                 free_irq(global_dev.pdev->irq, &viafb_dma_users);
 219         }
 220         mutex_unlock(&viafb_dma_lock);
 221 }
 222 EXPORT_SYMBOL_GPL(viafb_release_dma);
 223
 224
 225 #if 0
 226 /*
 227  * Copy a single buffer from FB memory, synchronously.  This code works
 228  * but is not currently used.
 229  */
 230 void viafb_dma_copy_out(unsigned int offset, dma_addr_t paddr, int len)
 231 {
 232         unsigned long flags;
 233         int csr;
 234
 235         mutex_lock(&viafb_dma_lock);
 236         init_completion(&viafb_dma_completion);
 237         /*
 238          * Program the controller.
 239          */
 240         spin_lock_irqsave(&global_dev.reg_lock, flags);
 241         viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
 242         /* Enable ints; must happen after CSR0 write! */
 243         viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE);
 244         viafb_mmio_write(VDMA_MARL0, (int) (paddr & 0xfffffff0));
 245         viafb_mmio_write(VDMA_MARH0, (int) ((paddr >> 28) & 0xfff));
 246         /* Data sheet suggests DAR0 should be <<4, but it lies */
 247         viafb_mmio_write(VDMA_DAR0, offset);
 248         viafb_mmio_write(VDMA_DQWCR0, len >> 4);
 249         viafb_mmio_write(VDMA_TMR0, 0);
 250         viafb_mmio_write(VDMA_DPRL0, 0);
 251         viafb_mmio_write(VDMA_DPRH0, 0);
 252         viafb_mmio_write(VDMA_PMR0, 0);
 253         csr = viafb_mmio_read(VDMA_CSR0);
 254         viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
 255         spin_unlock_irqrestore(&global_dev.reg_lock, flags);
 256         /*
 257          * Now we just wait until the interrupt handler says
 258          * we're done.
 259          */
 260         wait_for_completion_interruptible(&viafb_dma_completion);
 261         viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
 262         mutex_unlock(&viafb_dma_lock);
 263 }
 264 EXPORT_SYMBOL_GPL(viafb_dma_copy_out);
 265 #endif
 266
 267 /*
 268  * Do a scatter/gather DMA copy from FB memory.  You must have done
 269  * a successful call to viafb_request_dma() first.
 270  */
 271 int viafb_dma_copy_out_sg(unsigned int offset, struct scatterlist *sg, int nsg)
 272 {
 273         struct viafb_vx855_dma_descr *descr;
 274         void *descrpages;
 275         dma_addr_t descr_handle;
 276         unsigned long flags;
 277         int i;
 278         struct scatterlist *sgentry;
 279         dma_addr_t nextdesc;
 280
 281         /*
 282          * Get a place to put the descriptors.
 283          */
 284         descrpages = dma_alloc_coherent(&global_dev.pdev->dev,
 285                         nsg*sizeof(struct viafb_vx855_dma_descr),
 286                         &descr_handle, GFP_KERNEL);
 287         if (descrpages == NULL) {
 288                 dev_err(&global_dev.pdev->dev, "Unable to get descr page.\n");
 289                 return -ENOMEM;
 290         }
 291         mutex_lock(&viafb_dma_lock);
 292         /*
 293          * Fill them in.
 294          */
 295         descr = descrpages;
 296         nextdesc = descr_handle + sizeof(struct viafb_vx855_dma_descr);
 297         for_each_sg(sg, sgentry, nsg, i) {
 298                 dma_addr_t paddr = sg_dma_address(sgentry);
 299                 descr->addr_low = paddr & 0xfffffff0;
 300                 descr->addr_high = ((u64) paddr >> 32) & 0x0fff;
 301                 descr->fb_offset = offset;
 302                 descr->seg_size = sg_dma_len(sgentry) >> 4;
 303                 descr->tile_mode = 0;
 304                 descr->next_desc_low = (nextdesc&0xfffffff0) | VIAFB_DMA_MAGIC;
 305                 descr->next_desc_high = ((u64) nextdesc >> 32) & 0x0fff;
 306                 descr->pad = 0xffffffff;  /* VIA driver does this */
 307                 offset += sg_dma_len(sgentry);
 308                 nextdesc += sizeof(struct viafb_vx855_dma_descr);
 309                 descr++;
 310         }
 311         descr[-1].next_desc_low = VIAFB_DMA_FINAL_SEGMENT|VIAFB_DMA_MAGIC;
 312         /*
 313          * Program the engine.
 314          */
 315         spin_lock_irqsave(&global_dev.reg_lock, flags);
 316         init_completion(&viafb_dma_completion);
 317         viafb_mmio_write(VDMA_DQWCR0, 0);
 318         viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
 319         viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE | VDMA_MR_CHAIN);
 320         viafb_mmio_write(VDMA_DPRL0, descr_handle | VIAFB_DMA_MAGIC);
 321         viafb_mmio_write(VDMA_DPRH0,
 322                         (((u64)descr_handle >> 32) & 0x0fff) | 0xf0000);
 323         (void) viafb_mmio_read(VDMA_CSR0);
 324         viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
 325         spin_unlock_irqrestore(&global_dev.reg_lock, flags);
 326         /*
 327          * Now we just wait until the interrupt handler says
 328          * we're done.  Except that, actually, we need to wait a little
 329          * longer: the interrupts seem to jump the gun a little and we
 330          * get corrupted frames sometimes.
 331          */
 332         wait_for_completion_timeout(&viafb_dma_completion, 1);
 333         msleep(1);
 334         if ((viafb_mmio_read(VDMA_CSR0)&VDMA_C_DONE) == 0)
 335                 printk(KERN_ERR "VIA DMA timeout!\n");
 336         /*
 337          * Clean up and we're done.
 338          */
 339         viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
 340         viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
 341         mutex_unlock(&viafb_dma_lock);
 342         dma_free_coherent(&global_dev.pdev->dev,
 343                         nsg*sizeof(struct viafb_vx855_dma_descr), descrpages,
 344                         descr_handle);
 345         return 0;
 346 }
 347 EXPORT_SYMBOL_GPL(viafb_dma_copy_out_sg);
 348 #endif /* CONFIG_VIDEO_VIA_CAMERA */
 349
 350 /* ---------------------------------------------------------------------- */
 351 /*
 352  * Figure out how big our framebuffer memory is.  Kind of ugly,
 353  * but evidently we can't trust the information found in the
 354  * fbdev configuration area.
 355  */
 356 static u16 via_function3[] = {
 357         CLE266_FUNCTION3, KM400_FUNCTION3, CN400_FUNCTION3, CN700_FUNCTION3,
 358         CX700_FUNCTION3, KM800_FUNCTION3, KM890_FUNCTION3, P4M890_FUNCTION3,
 359         P4M900_FUNCTION3, VX800_FUNCTION3, VX855_FUNCTION3, VX900_FUNCTION3,
 360 };
 361
 362 /* Get the BIOS-configured framebuffer size from PCI configuration space
 363  * of function 3 in the respective chipset */
 364 static int viafb_get_fb_size_from_pci(int chip_type)
 365 {
 366         int i;
 367         u8 offset = 0;
 368         u32 FBSize;
 369         u32 VideoMemSize;
 370
 371         /* search for the "FUNCTION3" device in this chipset */
 372         for (i = 0; i < ARRAY_SIZE(via_function3); i++) {
 373                 struct pci_dev *pdev;
 374
 375                 pdev = pci_get_device(PCI_VENDOR_ID_VIA, via_function3[i],
 376                                       NULL);
 377                 if (!pdev)
 378                         continue;
 379
 380                 DEBUG_MSG(KERN_INFO "Device ID = %x\n", pdev->device);
 381
 382                 switch (pdev->device) {
 383                 case CLE266_FUNCTION3:
 384                 case KM400_FUNCTION3:
 385                         offset = 0xE0;
 386                         break;
 387                 case CN400_FUNCTION3:
 388                 case CN700_FUNCTION3:
 389                 case CX700_FUNCTION3:
 390                 case KM800_FUNCTION3:
 391                 case KM890_FUNCTION3:
 392                 case P4M890_FUNCTION3:
 393                 case P4M900_FUNCTION3:
 394                 case VX800_FUNCTION3:
 395                 case VX855_FUNCTION3:
 396                 case VX900_FUNCTION3:
 397                 /*case CN750_FUNCTION3: */
 398                         offset = 0xA0;
 399                         break;
 400                 }
 401
 402                 if (!offset)
 403                         break;
 404
 405                 pci_read_config_dword(pdev, offset, &FBSize);
 406                 pci_dev_put(pdev);
 407         }
 408
 409         if (!offset) {
 410                 printk(KERN_ERR "cannot determine framebuffer size\n");
 411                 return -EIO;
 412         }
 413
 414         FBSize = FBSize & 0x00007000;
 415         DEBUG_MSG(KERN_INFO "FB Size = %x\n", FBSize);
 416
 417         if (chip_type < UNICHROME_CX700) {
 418                 switch (FBSize) {
 419                 case 0x00004000:
 420                         VideoMemSize = (16 << 20);      /*16M */
 421                         break;
 422
 423                 case 0x00005000:
 424                         VideoMemSize = (32 << 20);      /*32M */
 425                         break;
 426
 427                 case 0x00006000:
 428                         VideoMemSize = (64 << 20);      /*64M */
 429                         break;
 430
 431                 default:
 432                         VideoMemSize = (32 << 20);      /*32M */
 433                         break;
 434                 }
 435         } else {
 436                 switch (FBSize) {
 437                 case 0x00001000:
 438                         VideoMemSize = (8 << 20);       /*8M */
 439                         break;
 440
 441                 case 0x00002000:
 442                         VideoMemSize = (16 << 20);      /*16M */
 443                         break;
 444
 445                 case 0x00003000:
 446                         VideoMemSize = (32 << 20);      /*32M */
 447                         break;
 448
 449                 case 0x00004000:
 450                         VideoMemSize = (64 << 20);      /*64M */
 451                         break;
 452
 453                 case 0x00005000:
 454                         VideoMemSize = (128 << 20);     /*128M */
 455                         break;
 456
 457                 case 0x00006000:
 458                         VideoMemSize = (256 << 20);     /*256M */
 459                         break;
 460
 461                 case 0x00007000:        /* Only on VX855/875 */
 462                         VideoMemSize = (512 << 20);     /*512M */
 463                         break;
 464
 465                 default:
 466                         VideoMemSize = (32 << 20);      /*32M */
 467                         break;
 468                 }
 469         }
 470
 471         return VideoMemSize;
 472 }
 473
 474
 475 /*
 476  * Figure out and map our MMIO regions.
 477  */
 478 static int via_pci_setup_mmio(struct viafb_dev *vdev)
 479 {
 480         int ret;
 481         /*
 482          * Hook up to the device registers.  Note that we soldier
 483          * on if it fails; the framebuffer can operate (without
 484          * acceleration) without this region.
 485          */
 486         vdev->engine_start = pci_resource_start(vdev->pdev, 1);
 487         vdev->engine_len = pci_resource_len(vdev->pdev, 1);
 488         vdev->engine_mmio = ioremap_nocache(vdev->engine_start,
 489                         vdev->engine_len);
 490         if (vdev->engine_mmio == NULL)
 491                 dev_err(&vdev->pdev->dev,
 492                                 "Unable to map engine MMIO; operation will be "
 493                                 "slow and crippled.\n");
 494         /*
 495          * Map in framebuffer memory.  For now, failure here is
 496          * fatal.  Unfortunately, in the absence of significant
 497          * vmalloc space, failure here is also entirely plausible.
 498          * Eventually we want to move away from mapping this
 499          * entire region.
 500          */
 501         if (vdev->chip_type == UNICHROME_VX900)
 502                 vdev->fbmem_start = pci_resource_start(vdev->pdev, 2);
 503         else
 504                 vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);
 505         ret = vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
 506         if (ret < 0)
 507                 goto out_unmap;
 508
 509         /* try to map less memory on failure, 8 MB should be still enough */
 510         for (; vdev->fbmem_len >= 8 << 20; vdev->fbmem_len /= 2) {
 511                 vdev->fbmem = ioremap_wc(vdev->fbmem_start, vdev->fbmem_len);
 512                 if (vdev->fbmem)
 513                         break;
 514         }
 515
 516         if (vdev->fbmem == NULL) {
 517                 ret = -ENOMEM;
 518                 goto out_unmap;
 519         }
 520         return 0;
 521 out_unmap:
 522         iounmap(vdev->engine_mmio);
 523         return ret;
 524 }
 525
 526 static void via_pci_teardown_mmio(struct viafb_dev *vdev)
 527 {
 528         iounmap(vdev->fbmem);
 529         iounmap(vdev->engine_mmio);
 530 }
 531
 532 /*
 533  * Create our subsidiary devices.
 534  */
 535 static struct viafb_subdev_info {
 536         char *name;
 537         struct platform_device *platdev;
 538 } viafb_subdevs[] = {
 539         {
 540                 .name = "viafb-gpio",
 541         },
 542         {
 543                 .name = "viafb-i2c",
 544         },
 545 #if IS_ENABLED(CONFIG_VIDEO_VIA_CAMERA)
 546         {
 547                 .name = "viafb-camera",
 548         },
 549 #endif
 550 };
 551 #define N_SUBDEVS ARRAY_SIZE(viafb_subdevs)
 552
 553 static int via_create_subdev(struct viafb_dev *vdev,
 554                              struct viafb_subdev_info *info)
 555 {
 556         int ret;
 557
 558         info->platdev = platform_device_alloc(info->name, -1);
 559         if (!info->platdev) {
 560                 dev_err(&vdev->pdev->dev, "Unable to allocate pdev %s\n",
 561                         info->name);
 562                 return -ENOMEM;
 563         }
 564         info->platdev->dev.parent = &vdev->pdev->dev;
 565         info->platdev->dev.platform_data = vdev;
 566         ret = platform_device_add(info->platdev);
 567         if (ret) {
 568                 dev_err(&vdev->pdev->dev, "Unable to add pdev %s\n",
 569                                 info->name);
 570                 platform_device_put(info->platdev);
 571                 info->platdev = NULL;
 572         }
 573         return ret;
 574 }
 575
 576 static int via_setup_subdevs(struct viafb_dev *vdev)
 577 {
 578         int i;
 579
 580         /*
 581          * Ignore return values.  Even if some of the devices
 582          * fail to be created, we'll still be able to use some
 583          * of the rest.
 584          */
 585         for (i = 0; i < N_SUBDEVS; i++)
 586                 via_create_subdev(vdev, viafb_subdevs + i);
 587         return 0;
 588 }
 589
 590 static void via_teardown_subdevs(void)
 591 {
 592         int i;
 593
 594         for (i = 0; i < N_SUBDEVS; i++)
 595                 if (viafb_subdevs[i].platdev) {
 596                         viafb_subdevs[i].platdev->dev.platform_data = NULL;
 597                         platform_device_unregister(viafb_subdevs[i].platdev);
 598                 }
 599 }
 600
 601 /*
 602  * Power management functions
 603  */
 604 #ifdef CONFIG_PM
 605 static LIST_HEAD(viafb_pm_hooks);
 606 static DEFINE_MUTEX(viafb_pm_hooks_lock);
 607
 608 void viafb_pm_register(struct viafb_pm_hooks *hooks)
 609 {
 610         INIT_LIST_HEAD(&hooks->list);
 611
 612         mutex_lock(&viafb_pm_hooks_lock);
 613         list_add_tail(&hooks->list, &viafb_pm_hooks);
 614         mutex_unlock(&viafb_pm_hooks_lock);
 615 }
 616 EXPORT_SYMBOL_GPL(viafb_pm_register);
 617
 618 void viafb_pm_unregister(struct viafb_pm_hooks *hooks)
 619 {
 620         mutex_lock(&viafb_pm_hooks_lock);
 621         list_del(&hooks->list);
 622         mutex_unlock(&viafb_pm_hooks_lock);
 623 }
 624 EXPORT_SYMBOL_GPL(viafb_pm_unregister);
 625
 626 static int via_suspend(struct pci_dev *pdev, pm_message_t state)
 627 {
 628         struct viafb_pm_hooks *hooks;
 629
 630         if (state.event != PM_EVENT_SUSPEND)
 631                 return 0;
 632         /*
 633          * "I've occasionally hit a few drivers that caused suspend
 634          * failures, and each and every time it was a driver bug, and
 635          * the right thing to do was to just ignore the error and suspend
 636          * anyway - returning an error code and trying to undo the suspend
 637          * is not what anybody ever really wants, even if our model
 638          *_allows_ for it."
 639          * -- Linus Torvalds, Dec. 7, 2009
 640          */
 641         mutex_lock(&viafb_pm_hooks_lock);
 642         list_for_each_entry_reverse(hooks, &viafb_pm_hooks, list)
 643                 hooks->suspend(hooks->private);
 644         mutex_unlock(&viafb_pm_hooks_lock);
 645
 646         pci_save_state(pdev);
 647         pci_disable_device(pdev);
 648         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 649         return 0;
 650 }
 651
 652 static int via_resume(struct pci_dev *pdev)
 653 {
 654         struct viafb_pm_hooks *hooks;
 655
 656         /* Get the bus side powered up */
 657         pci_set_power_state(pdev, PCI_D0);
 658         pci_restore_state(pdev);
 659         if (pci_enable_device(pdev))
 660                 return 0;
 661
 662         pci_set_master(pdev);
 663
 664         /* Now bring back any subdevs */
 665         mutex_lock(&viafb_pm_hooks_lock);
 666         list_for_each_entry(hooks, &viafb_pm_hooks, list)
 667                 hooks->resume(hooks->private);
 668         mutex_unlock(&viafb_pm_hooks_lock);
 669
 670         return 0;
 671 }
 672 #endif /* CONFIG_PM */
 673
 674 static int via_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 675 {
 676         int ret;
 677
 678         ret = pci_enable_device(pdev);
 679         if (ret)
 680                 return ret;
 681
 682         /*
 683          * Global device initialization.
 684          */
 685         memset(&global_dev, 0, sizeof(global_dev));
 686         global_dev.pdev = pdev;
 687         global_dev.chip_type = ent->driver_data;
 688         global_dev.port_cfg = adap_configs;
 689         if (machine_is_olpc())
 690                 global_dev.port_cfg = olpc_adap_configs;
 691
 692         spin_lock_init(&global_dev.reg_lock);
 693         ret = via_pci_setup_mmio(&global_dev);
 694         if (ret)
 695                 goto out_disable;
 696         /*
 697          * Set up interrupts and create our subdevices.  Continue even if
 698          * some things fail.
 699          */
 700         viafb_int_init();
 701         via_setup_subdevs(&global_dev);
 702         /*
 703          * Set up the framebuffer device
 704          */
 705         ret = via_fb_pci_probe(&global_dev);
 706         if (ret)
 707                 goto out_subdevs;
 708         return 0;
 709
 710 out_subdevs:
 711         via_teardown_subdevs();
 712         via_pci_teardown_mmio(&global_dev);
 713 out_disable:
 714         pci_disable_device(pdev);
 715         return ret;
 716 }
 717
 718 static void via_pci_remove(struct pci_dev *pdev)
 719 {
 720         via_teardown_subdevs();
 721         via_fb_pci_remove(pdev);
 722         via_pci_teardown_mmio(&global_dev);
 723         pci_disable_device(pdev);
 724 }
 725
 726
 727 static const struct pci_device_id via_pci_table[] = {
 728         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CLE266_DID),
 729           .driver_data = UNICHROME_CLE266 },
 730         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K400_DID),
 731           .driver_data = UNICHROME_K400 },
 732         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K800_DID),
 733           .driver_data = UNICHROME_K800 },
 734         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_PM800_DID),
 735           .driver_data = UNICHROME_PM800 },
 736         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN700_DID),
 737           .driver_data = UNICHROME_CN700 },
 738         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CX700_DID),
 739           .driver_data = UNICHROME_CX700 },
 740         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN750_DID),
 741           .driver_data = UNICHROME_CN750 },
 742         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K8M890_DID),
 743           .driver_data = UNICHROME_K8M890 },
 744         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M890_DID),
 745           .driver_data = UNICHROME_P4M890 },
 746         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M900_DID),
 747           .driver_data = UNICHROME_P4M900 },
 748         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX800_DID),
 749           .driver_data = UNICHROME_VX800 },
 750         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX855_DID),
 751           .driver_data = UNICHROME_VX855 },
 752         { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX900_DID),
 753           .driver_data = UNICHROME_VX900 },
 754         { }
 755 };
 756 MODULE_DEVICE_TABLE(pci, via_pci_table);
 757
 758 static struct pci_driver via_driver = {
 759         .name           = "viafb",
 760         .id_table       = via_pci_table,
 761         .probe          = via_pci_probe,
 762         .remove         = via_pci_remove,
 763 #ifdef CONFIG_PM
 764         .suspend        = via_suspend,
 765         .resume         = via_resume,
 766 #endif
 767 };
 768
 769 static int __init via_core_init(void)
 770 {
 771         int ret;
 772
 773         ret = viafb_init();
 774         if (ret)
 775                 return ret;
 776         viafb_i2c_init();
 777         viafb_gpio_init();
 778         return pci_register_driver(&via_driver);
 779 }
 780
 781 static void __exit via_core_exit(void)
 782 {
 783         pci_unregister_driver(&via_driver);
 784         viafb_gpio_exit();
 785         viafb_i2c_exit();
 786         viafb_exit();
 787 }
 788
 789 module_init(via_core_init);
 790 module_exit(via_core_exit);