arch/sparc64/kernel/ebus.c

   1 /*
   2  * ebus.c: PCI to EBus bridge device.
   3  *
   4  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
   5  * Copyright (C) 1999  David S. Miller (davem@redhat.com)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <linux/string.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/delay.h>
  16 #include <linux/pci.h>
  17
  18 #include <asm/system.h>
  19 #include <asm/page.h>
  20 #include <asm/ebus.h>
  21 #include <asm/oplib.h>
  22 #include <asm/prom.h>
  23 #include <asm/of_device.h>
  24 #include <asm/bpp.h>
  25 #include <asm/irq.h>
  26 #include <asm/io.h>
  27
  28 /* EBUS dma library. */
  29
  30 #define EBDMA_CSR       0x00UL  /* Control/Status */
  31 #define EBDMA_ADDR      0x04UL  /* DMA Address */
  32 #define EBDMA_COUNT     0x08UL  /* DMA Count */
  33
  34 #define EBDMA_CSR_INT_PEND      0x00000001
  35 #define EBDMA_CSR_ERR_PEND      0x00000002
  36 #define EBDMA_CSR_DRAIN         0x00000004
  37 #define EBDMA_CSR_INT_EN        0x00000010
  38 #define EBDMA_CSR_RESET         0x00000080
  39 #define EBDMA_CSR_WRITE         0x00000100
  40 #define EBDMA_CSR_EN_DMA        0x00000200
  41 #define EBDMA_CSR_CYC_PEND      0x00000400
  42 #define EBDMA_CSR_DIAG_RD_DONE  0x00000800
  43 #define EBDMA_CSR_DIAG_WR_DONE  0x00001000
  44 #define EBDMA_CSR_EN_CNT        0x00002000
  45 #define EBDMA_CSR_TC            0x00004000
  46 #define EBDMA_CSR_DIS_CSR_DRN   0x00010000
  47 #define EBDMA_CSR_BURST_SZ_MASK 0x000c0000
  48 #define EBDMA_CSR_BURST_SZ_1    0x00080000
  49 #define EBDMA_CSR_BURST_SZ_4    0x00000000
  50 #define EBDMA_CSR_BURST_SZ_8    0x00040000
  51 #define EBDMA_CSR_BURST_SZ_16   0x000c0000
  52 #define EBDMA_CSR_DIAG_EN       0x00100000
  53 #define EBDMA_CSR_DIS_ERR_PEND  0x00400000
  54 #define EBDMA_CSR_TCI_DIS       0x00800000
  55 #define EBDMA_CSR_EN_NEXT       0x01000000
  56 #define EBDMA_CSR_DMA_ON        0x02000000
  57 #define EBDMA_CSR_A_LOADED      0x04000000
  58 #define EBDMA_CSR_NA_LOADED     0x08000000
  59 #define EBDMA_CSR_DEV_ID_MASK   0xf0000000
  60
  61 #define EBUS_DMA_RESET_TIMEOUT  10000
  62
  63 static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain)
  64 {
  65         int i;
  66         u32 val = 0;
  67
  68         writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR);
  69         udelay(1);
  70
  71         if (no_drain)
  72                 return;
  73
  74         for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) {
  75                 val = readl(p->regs + EBDMA_CSR);
  76
  77                 if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND)))
  78                         break;
  79                 udelay(10);
  80         }
  81 }
  82
  83 static irqreturn_t ebus_dma_irq(int irq, void *dev_id)
  84 {
  85         struct ebus_dma_info *p = dev_id;
  86         unsigned long flags;
  87         u32 csr = 0;
  88
  89         spin_lock_irqsave(&p->lock, flags);
  90         csr = readl(p->regs + EBDMA_CSR);
  91         writel(csr, p->regs + EBDMA_CSR);
  92         spin_unlock_irqrestore(&p->lock, flags);
  93
  94         if (csr & EBDMA_CSR_ERR_PEND) {
  95                 printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name);
  96                 p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie);
  97                 return IRQ_HANDLED;
  98         } else if (csr & EBDMA_CSR_INT_PEND) {
  99                 p->callback(p,
 100                             (csr & EBDMA_CSR_TC) ?
 101                             EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE,
 102                             p->client_cookie);
 103                 return IRQ_HANDLED;
 104         }
 105
 106         return IRQ_NONE;
 107
 108 }
 109
 110 int ebus_dma_register(struct ebus_dma_info *p)
 111 {
 112         u32 csr;
 113
 114         if (!p->regs)
 115                 return -EINVAL;
 116         if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
 117                          EBUS_DMA_FLAG_TCI_DISABLE))
 118                 return -EINVAL;
 119         if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback)
 120                 return -EINVAL;
 121         if (!strlen(p->name))
 122                 return -EINVAL;
 123
 124         __ebus_dma_reset(p, 1);
 125
 126         csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT;
 127
 128         if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
 129                 csr |= EBDMA_CSR_TCI_DIS;
 130
 131         writel(csr, p->regs + EBDMA_CSR);
 132
 133         return 0;
 134 }
 135 EXPORT_SYMBOL(ebus_dma_register);
 136
 137 int ebus_dma_irq_enable(struct ebus_dma_info *p, int on)
 138 {
 139         unsigned long flags;
 140         u32 csr;
 141
 142         if (on) {
 143                 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
 144                         if (request_irq(p->irq, ebus_dma_irq, IRQF_SHARED, p->name, p))
 145                                 return -EBUSY;
 146                 }
 147
 148                 spin_lock_irqsave(&p->lock, flags);
 149                 csr = readl(p->regs + EBDMA_CSR);
 150                 csr |= EBDMA_CSR_INT_EN;
 151                 writel(csr, p->regs + EBDMA_CSR);
 152                 spin_unlock_irqrestore(&p->lock, flags);
 153         } else {
 154                 spin_lock_irqsave(&p->lock, flags);
 155                 csr = readl(p->regs + EBDMA_CSR);
 156                 csr &= ~EBDMA_CSR_INT_EN;
 157                 writel(csr, p->regs + EBDMA_CSR);
 158                 spin_unlock_irqrestore(&p->lock, flags);
 159
 160                 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
 161                         free_irq(p->irq, p);
 162                 }
 163         }
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL(ebus_dma_irq_enable);
 168
 169 void ebus_dma_unregister(struct ebus_dma_info *p)
 170 {
 171         unsigned long flags;
 172         u32 csr;
 173         int irq_on = 0;
 174
 175         spin_lock_irqsave(&p->lock, flags);
 176         csr = readl(p->regs + EBDMA_CSR);
 177         if (csr & EBDMA_CSR_INT_EN) {
 178                 csr &= ~EBDMA_CSR_INT_EN;
 179                 writel(csr, p->regs + EBDMA_CSR);
 180                 irq_on = 1;
 181         }
 182         spin_unlock_irqrestore(&p->lock, flags);
 183
 184         if (irq_on)
 185                 free_irq(p->irq, p);
 186 }
 187 EXPORT_SYMBOL(ebus_dma_unregister);
 188
 189 int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len)
 190 {
 191         unsigned long flags;
 192         u32 csr;
 193         int err;
 194
 195         if (len >= (1 << 24))
 196                 return -EINVAL;
 197
 198         spin_lock_irqsave(&p->lock, flags);
 199         csr = readl(p->regs + EBDMA_CSR);
 200         err = -EINVAL;
 201         if (!(csr & EBDMA_CSR_EN_DMA))
 202                 goto out;
 203         err = -EBUSY;
 204         if (csr & EBDMA_CSR_NA_LOADED)
 205                 goto out;
 206
 207         writel(len,      p->regs + EBDMA_COUNT);
 208         writel(bus_addr, p->regs + EBDMA_ADDR);
 209         err = 0;
 210
 211 out:
 212         spin_unlock_irqrestore(&p->lock, flags);
 213
 214         return err;
 215 }
 216 EXPORT_SYMBOL(ebus_dma_request);
 217
 218 void ebus_dma_prepare(struct ebus_dma_info *p, int write)
 219 {
 220         unsigned long flags;
 221         u32 csr;
 222
 223         spin_lock_irqsave(&p->lock, flags);
 224         __ebus_dma_reset(p, 0);
 225
 226         csr = (EBDMA_CSR_INT_EN |
 227                EBDMA_CSR_EN_CNT |
 228                EBDMA_CSR_BURST_SZ_16 |
 229                EBDMA_CSR_EN_NEXT);
 230
 231         if (write)
 232                 csr |= EBDMA_CSR_WRITE;
 233         if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
 234                 csr |= EBDMA_CSR_TCI_DIS;
 235
 236         writel(csr, p->regs + EBDMA_CSR);
 237
 238         spin_unlock_irqrestore(&p->lock, flags);
 239 }
 240 EXPORT_SYMBOL(ebus_dma_prepare);
 241
 242 unsigned int ebus_dma_residue(struct ebus_dma_info *p)
 243 {
 244         return readl(p->regs + EBDMA_COUNT);
 245 }
 246 EXPORT_SYMBOL(ebus_dma_residue);
 247
 248 unsigned int ebus_dma_addr(struct ebus_dma_info *p)
 249 {
 250         return readl(p->regs + EBDMA_ADDR);
 251 }
 252 EXPORT_SYMBOL(ebus_dma_addr);
 253
 254 void ebus_dma_enable(struct ebus_dma_info *p, int on)
 255 {
 256         unsigned long flags;
 257         u32 orig_csr, csr;
 258
 259         spin_lock_irqsave(&p->lock, flags);
 260         orig_csr = csr = readl(p->regs + EBDMA_CSR);
 261         if (on)
 262                 csr |= EBDMA_CSR_EN_DMA;
 263         else
 264                 csr &= ~EBDMA_CSR_EN_DMA;
 265         if ((orig_csr & EBDMA_CSR_EN_DMA) !=
 266             (csr & EBDMA_CSR_EN_DMA))
 267                 writel(csr, p->regs + EBDMA_CSR);
 268         spin_unlock_irqrestore(&p->lock, flags);
 269 }
 270 EXPORT_SYMBOL(ebus_dma_enable);
 271
 272 struct linux_ebus *ebus_chain = NULL;
 273
 274 static inline void *ebus_alloc(size_t size)
 275 {
 276         void *mem;
 277
 278         mem = kzalloc(size, GFP_ATOMIC);
 279         if (!mem)
 280                 panic("ebus_alloc: out of memory");
 281         return mem;
 282 }
 283
 284 static void __init fill_ebus_child(struct device_node *dp,
 285                                    struct linux_ebus_child *dev,
 286                                    int non_standard_regs)
 287 {
 288         struct of_device *op;
 289         const int *regs;
 290         int i, len;
 291
 292         dev->prom_node = dp;
 293         printk(" (%s)", dp->name);
 294
 295         regs = of_get_property(dp, "reg", &len);
 296         if (!regs)
 297                 dev->num_addrs = 0;
 298         else
 299                 dev->num_addrs = len / sizeof(regs[0]);
 300
 301         if (non_standard_regs) {
 302                 /* This is to handle reg properties which are not
 303                  * in the parent relative format.  One example are
 304                  * children of the i2c device on CompactPCI systems.
 305                  *
 306                  * So, for such devices we just record the property
 307                  * raw in the child resources.
 308                  */
 309                 for (i = 0; i < dev->num_addrs; i++)
 310                         dev->resource[i].start = regs[i];
 311         } else {
 312                 for (i = 0; i < dev->num_addrs; i++) {
 313                         int rnum = regs[i];
 314                         if (rnum >= dev->parent->num_addrs) {
 315                                 prom_printf("UGH: property for %s was %d, need < %d\n",
 316                                             dp->name, len, dev->parent->num_addrs);
 317                                 prom_halt();
 318                         }
 319                         dev->resource[i].start = dev->parent->resource[i].start;
 320                         dev->resource[i].end = dev->parent->resource[i].end;
 321                         dev->resource[i].flags = IORESOURCE_MEM;
 322                         dev->resource[i].name = dp->name;
 323                 }
 324         }
 325
 326         op = of_find_device_by_node(dp);
 327         if (!op) {
 328                 dev->num_irqs = 0;
 329         } else {
 330                 dev->num_irqs = op->num_irqs;
 331                 for (i = 0; i < dev->num_irqs; i++)
 332                         dev->irqs[i] = op->irqs[i];
 333         }
 334
 335         if (!dev->num_irqs) {
 336                 /*
 337                  * Oh, well, some PROMs don't export interrupts
 338                  * property to children of EBus devices...
 339                  *
 340                  * Be smart about PS/2 keyboard and mouse.
 341                  */
 342                 if (!strcmp(dev->parent->prom_node->name, "8042")) {
 343                         if (!strcmp(dev->prom_node->name, "kb_ps2")) {
 344                                 dev->num_irqs = 1;
 345                                 dev->irqs[0] = dev->parent->irqs[0];
 346                         } else {
 347                                 dev->num_irqs = 1;
 348                                 dev->irqs[0] = dev->parent->irqs[1];
 349                         }
 350                 }
 351         }
 352 }
 353
 354 static int __init child_regs_nonstandard(struct linux_ebus_device *dev)
 355 {
 356         if (!strcmp(dev->prom_node->name, "i2c") ||
 357             !strcmp(dev->prom_node->name, "SUNW,lombus"))
 358                 return 1;
 359         return 0;
 360 }
 361
 362 static void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_device *dev)
 363 {
 364         struct linux_ebus_child *child;
 365         struct dev_archdata *sd;
 366         struct of_device *op;
 367         int i, len;
 368
 369         dev->prom_node = dp;
 370
 371         printk(" [%s", dp->name);
 372
 373         op = of_find_device_by_node(dp);
 374         if (!op) {
 375                 dev->num_addrs = 0;
 376                 dev->num_irqs = 0;
 377         } else {
 378                 const int *regs = of_get_property(dp, "reg", &len);
 379
 380                 if (!regs)
 381                         len = 0;
 382                 dev->num_addrs = len / sizeof(struct linux_prom_registers);
 383
 384                 for (i = 0; i < dev->num_addrs; i++)
 385                         memcpy(&dev->resource[i],
 386                                &op->resource[i],
 387                                sizeof(struct resource));
 388
 389                 dev->num_irqs = op->num_irqs;
 390                 for (i = 0; i < dev->num_irqs; i++)
 391                         dev->irqs[i] = op->irqs[i];
 392         }
 393
 394         sd = &dev->ofdev.dev.archdata;
 395         sd->prom_node = dp;
 396         sd->op = &dev->ofdev;
 397         sd->iommu = dev->bus->ofdev.dev.parent->archdata.iommu;
 398         sd->stc = dev->bus->ofdev.dev.parent->archdata.stc;
 399         sd->numa_node = dev->bus->ofdev.dev.parent->archdata.numa_node;
 400
 401         dev->ofdev.node = dp;
 402         dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
 403         dev->ofdev.dev.bus = &ebus_bus_type;
 404         sprintf(dev->ofdev.dev.bus_id, "ebus[%08x]", dp->node);
 405
 406         /* Register with core */
 407         if (of_device_register(&dev->ofdev) != 0)
 408                 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 409                        dp->path_component_name);
 410
 411         dp = dp->child;
 412         if (dp) {
 413                 printk(" ->");
 414                 dev->children = ebus_alloc(sizeof(struct linux_ebus_child));
 415
 416                 child = dev->children;
 417                 child->next = NULL;
 418                 child->parent = dev;
 419                 child->bus = dev->bus;
 420                 fill_ebus_child(dp, child,
 421                                 child_regs_nonstandard(dev));
 422
 423                 while ((dp = dp->sibling) != NULL) {
 424                         child->next = ebus_alloc(sizeof(struct linux_ebus_child));
 425
 426                         child = child->next;
 427                         child->next = NULL;
 428                         child->parent = dev;
 429                         child->bus = dev->bus;
 430                         fill_ebus_child(dp, child,
 431                                         child_regs_nonstandard(dev));
 432                 }
 433         }
 434         printk("]");
 435 }
 436
 437 static struct pci_dev *find_next_ebus(struct pci_dev *start, int *is_rio_p)
 438 {
 439         struct pci_dev *pdev = start;
 440
 441         while ((pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_ANY_ID, pdev)))
 442                 if (pdev->device == PCI_DEVICE_ID_SUN_EBUS ||
 443                         pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS)
 444                         break;
 445
 446         *is_rio_p = !!(pdev && (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS));
 447
 448         return pdev;
 449 }
 450
 451 void __init ebus_init(void)
 452 {
 453         struct linux_ebus_device *dev;
 454         struct linux_ebus *ebus;
 455         struct pci_dev *pdev;
 456         struct device_node *dp;
 457         int is_rio;
 458         int num_ebus = 0;
 459
 460         pdev = find_next_ebus(NULL, &is_rio);
 461         if (!pdev) {
 462                 printk("ebus: No EBus's found.\n");
 463                 return;
 464         }
 465
 466         dp = pci_device_to_OF_node(pdev);
 467
 468         ebus_chain = ebus = ebus_alloc(sizeof(struct linux_ebus));
 469         ebus->next = NULL;
 470         ebus->is_rio = is_rio;
 471
 472         while (dp) {
 473                 struct device_node *child;
 474
 475                 /* SUNW,pci-qfe uses four empty ebuses on it.
 476                    I think we should not consider them here,
 477                    as they have half of the properties this
 478                    code expects and once we do PCI hot-plug,
 479                    we'd have to tweak with the ebus_chain
 480                    in the runtime after initialization. -jj */
 481                 if (!dp->child) {
 482                         pdev = find_next_ebus(pdev, &is_rio);
 483                         if (!pdev) {
 484                                 if (ebus == ebus_chain) {
 485                                         ebus_chain = NULL;
 486                                         printk("ebus: No EBus's found.\n");
 487                                         return;
 488                                 }
 489                                 break;
 490                         }
 491                         ebus->is_rio = is_rio;
 492                         dp = pci_device_to_OF_node(pdev);
 493                         continue;
 494                 }
 495                 printk("ebus%d:", num_ebus);
 496
 497                 ebus->index = num_ebus;
 498                 ebus->prom_node = dp;
 499                 ebus->self = pdev;
 500
 501                 ebus->ofdev.node = dp;
 502                 ebus->ofdev.dev.parent = &pdev->dev;
 503                 ebus->ofdev.dev.bus = &ebus_bus_type;
 504                 sprintf(ebus->ofdev.dev.bus_id, "ebus%d", num_ebus);
 505
 506                 /* Register with core */
 507                 if (of_device_register(&ebus->ofdev) != 0)
 508                         printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 509                                dp->path_component_name);
 510
 511
 512                 child = dp->child;
 513                 if (!child)
 514                         goto next_ebus;
 515
 516                 ebus->devices = ebus_alloc(sizeof(struct linux_ebus_device));
 517
 518                 dev = ebus->devices;
 519                 dev->next = NULL;
 520                 dev->children = NULL;
 521                 dev->bus = ebus;
 522                 fill_ebus_device(child, dev);
 523
 524                 while ((child = child->sibling) != NULL) {
 525                         dev->next = ebus_alloc(sizeof(struct linux_ebus_device));
 526
 527                         dev = dev->next;
 528                         dev->next = NULL;
 529                         dev->children = NULL;
 530                         dev->bus = ebus;
 531                         fill_ebus_device(child, dev);
 532                 }
 533
 534         next_ebus:
 535                 printk("\n");
 536
 537                 pdev = find_next_ebus(pdev, &is_rio);
 538                 if (!pdev)
 539                         break;
 540
 541                 dp = pci_device_to_OF_node(pdev);
 542
 543                 ebus->next = ebus_alloc(sizeof(struct linux_ebus));
 544                 ebus = ebus->next;
 545                 ebus->next = NULL;
 546                 ebus->is_rio = is_rio;
 547                 ++num_ebus;
 548         }
 549         pci_dev_put(pdev); /* XXX for the case, when ebusnd is 0, is it OK? */
 550 }