arch/sparc/kernel/ebus.c

   1 /*
   2  * ebus.c: PCI to EBus bridge device.
   3  *
   4  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
   5  *
   6  * Adopted for sparc by V. Roganov and G. Raiko.
   7  * Fixes for different platforms by Pete Zaitcev.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/system.h>
  17 #include <asm/page.h>
  18 #include <asm/pbm.h>
  19 #include <asm/ebus.h>
  20 #include <asm/io.h>
  21 #include <asm/oplib.h>
  22 #include <asm/prom.h>
  23 #include <asm/bpp.h>
  24
  25 struct linux_ebus *ebus_chain = NULL;
  26
  27 /* We are together with pcic.c under CONFIG_PCI. */
  28 extern unsigned int pcic_pin_to_irq(unsigned int, const char *name);
  29
  30 /*
  31  * IRQ Blacklist
  32  * Here we list PROMs and systems that are known to supply crap as IRQ numbers.
  33  */
  34 struct ebus_device_irq {
  35         char *name;
  36         unsigned int pin;
  37 };
  38
  39 struct ebus_system_entry {
  40         char *esname;
  41         struct ebus_device_irq *ipt;
  42 };
  43
  44 static struct ebus_device_irq je1_1[] = {
  45         { "8042",                3 },
  46         { "SUNW,CS4231",         0 },
  47         { "parallel",            0 },
  48         { "se",                  2 },
  49         { NULL, 0 }
  50 };
  51
  52 /*
  53  * Gleb's JE1 supplied reasonable pin numbers, but mine did not (OBP 2.32).
  54  * Blacklist the sucker... Note that Gleb's system will work.
  55  */
  56 static struct ebus_system_entry ebus_blacklist[] = {
  57         { "SUNW,JavaEngine1", je1_1 },
  58         { NULL, NULL }
  59 };
  60
  61 static struct ebus_device_irq *ebus_blackp = NULL;
  62
  63 /*
  64  */
  65 static inline unsigned long ebus_alloc(size_t size)
  66 {
  67         return (unsigned long)kmalloc(size, GFP_ATOMIC);
  68 }
  69
  70 /*
  71  */
  72 static int __init ebus_blacklist_irq(const char *name)
  73 {
  74         struct ebus_device_irq *dp;
  75
  76         if ((dp = ebus_blackp) != NULL) {
  77                 for (; dp->name != NULL; dp++) {
  78                         if (strcmp(name, dp->name) == 0) {
  79                                 return pcic_pin_to_irq(dp->pin, name);
  80                         }
  81                 }
  82         }
  83         return 0;
  84 }
  85
  86 static void __init fill_ebus_child(struct device_node *dp,
  87                                    struct linux_ebus_child *dev)
  88 {
  89         const int *regs;
  90         const int *irqs;
  91         int i, len;
  92
  93         dev->prom_node = dp;
  94         regs = of_get_property(dp, "reg", &len);
  95         if (!regs)
  96                 len = 0;
  97         dev->num_addrs = len / sizeof(regs[0]);
  98
  99         for (i = 0; i < dev->num_addrs; i++) {
 100                 if (regs[i] >= dev->parent->num_addrs) {
 101                         prom_printf("UGH: property for %s was %d, need < %d\n",
 102                                     dev->prom_node->name, len,
 103                                     dev->parent->num_addrs);
 104                         panic(__func__);
 105                 }
 106
 107                 /* XXX resource */
 108                 dev->resource[i].start =
 109                         dev->parent->resource[regs[i]].start;
 110         }
 111
 112         for (i = 0; i < PROMINTR_MAX; i++)
 113                 dev->irqs[i] = PCI_IRQ_NONE;
 114
 115         if ((dev->irqs[0] = ebus_blacklist_irq(dev->prom_node->name)) != 0) {
 116                 dev->num_irqs = 1;
 117         } else {
 118                 irqs = of_get_property(dp, "interrupts", &len);
 119                 if (!irqs) {
 120                         dev->num_irqs = 0;
 121                         dev->irqs[0] = 0;
 122                         if (dev->parent->num_irqs != 0) {
 123                                 dev->num_irqs = 1;
 124                                 dev->irqs[0] = dev->parent->irqs[0];
 125                         }
 126                 } else {
 127                         dev->num_irqs = len / sizeof(irqs[0]);
 128                         if (irqs[0] == 0 || irqs[0] >= 8) {
 129                                 /*
 130                                  * XXX Zero is a valid pin number...
 131                                  * This works as long as Ebus is not wired
 132                                  * to INTA#.
 133                                  */
 134                                 printk("EBUS: %s got bad irq %d from PROM\n",
 135                                        dev->prom_node->name, irqs[0]);
 136                                 dev->num_irqs = 0;
 137                                 dev->irqs[0] = 0;
 138                         } else {
 139                                 dev->irqs[0] =
 140                                         pcic_pin_to_irq(irqs[0],
 141                                                         dev->prom_node->name);
 142                         }
 143                 }
 144         }
 145 }
 146
 147 static void __init fill_ebus_device(struct device_node *dp,
 148                                     struct linux_ebus_device *dev)
 149 {
 150         const struct linux_prom_registers *regs;
 151         struct linux_ebus_child *child;
 152         struct dev_archdata *sd;
 153         const int *irqs;
 154         int i, n, len;
 155         unsigned long baseaddr;
 156
 157         dev->prom_node = dp;
 158
 159         regs = of_get_property(dp, "reg", &len);
 160         if (!regs)
 161                 len = 0;
 162         if (len % sizeof(struct linux_prom_registers)) {
 163                 prom_printf("UGH: proplen for %s was %d, need multiple of %d\n",
 164                             dev->prom_node->name, len,
 165                             (int)sizeof(struct linux_prom_registers));
 166                 panic(__func__);
 167         }
 168         dev->num_addrs = len / sizeof(struct linux_prom_registers);
 169
 170         for (i = 0; i < dev->num_addrs; i++) {
 171                 /*
 172                  * XXX Collect JE-1 PROM
 173                  *
 174                  * Example - JS-E with 3.11:
 175                  *  /ebus
 176                  *      regs
 177                  *        0x00000000, 0x0, 0x00000000, 0x0, 0x00000000,
 178                  *        0x82000010, 0x0, 0xf0000000, 0x0, 0x01000000,
 179                  *        0x82000014, 0x0, 0x38800000, 0x0, 0x00800000,
 180                  *      ranges
 181                  *        0x00, 0x00000000, 0x02000010, 0x0, 0x0, 0x01000000,
 182                  *        0x01, 0x01000000, 0x02000014, 0x0, 0x0, 0x00800000,
 183                  *  /ebus/8042
 184                  *      regs
 185                  *        0x00000001, 0x00300060, 0x00000008,
 186                  *        0x00000001, 0x00300060, 0x00000008,
 187                  */
 188                 n = regs[i].which_io;
 189                 if (n >= 4) {
 190                         /* XXX This is copied from old JE-1 by Gleb. */
 191                         n = (regs[i].which_io - 0x10) >> 2;
 192                 } else {
 193                         ;
 194                 }
 195
 196 /*
 197  * XXX Now as we have regions, why don't we make an on-demand allocation...
 198  */
 199                 dev->resource[i].start = 0;
 200                 if ((baseaddr = dev->bus->self->resource[n].start +
 201                     regs[i].phys_addr) != 0) {
 202                         /* dev->resource[i].name = dev->prom_name; */
 203                         if ((baseaddr = (unsigned long) ioremap(baseaddr,
 204                             regs[i].reg_size)) == 0) {
 205                                 panic("ebus: unable to remap dev %s",
 206                                       dev->prom_node->name);
 207                         }
 208                 }
 209                 dev->resource[i].start = baseaddr;      /* XXX Unaligned */
 210         }
 211
 212         for (i = 0; i < PROMINTR_MAX; i++)
 213                 dev->irqs[i] = PCI_IRQ_NONE;
 214
 215         if ((dev->irqs[0] = ebus_blacklist_irq(dev->prom_node->name)) != 0) {
 216                 dev->num_irqs = 1;
 217         } else {
 218                 irqs = of_get_property(dp, "interrupts", &len);
 219                 if (!irqs) {
 220                         dev->num_irqs = 0;
 221                         if ((dev->irqs[0] = dev->bus->self->irq) != 0) {
 222                                 dev->num_irqs = 1;
 223 /* P3 */ /* printk("EBUS: child %s irq %d from parent\n", dev->prom_name, dev->irqs[0]); */
 224                         }
 225                 } else {
 226                         dev->num_irqs = 1;  /* dev->num_irqs = len / sizeof(irqs[0]); */
 227                         if (irqs[0] == 0 || irqs[0] >= 8) {
 228                                 /* See above for the parent. XXX */
 229                                 printk("EBUS: %s got bad irq %d from PROM\n",
 230                                        dev->prom_node->name, irqs[0]);
 231                                 dev->num_irqs = 0;
 232                                 dev->irqs[0] = 0;
 233                         } else {
 234                                 dev->irqs[0] =
 235                                         pcic_pin_to_irq(irqs[0],
 236                                                         dev->prom_node->name);
 237                         }
 238                 }
 239         }
 240
 241         sd = &dev->ofdev.dev.archdata;
 242         sd->prom_node = dp;
 243         sd->op = &dev->ofdev;
 244         sd->iommu = dev->bus->ofdev.dev.parent->archdata.iommu;
 245
 246         dev->ofdev.node = dp;
 247         dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
 248         dev->ofdev.dev.bus = &ebus_bus_type;
 249         sprintf(dev->ofdev.dev.bus_id, "ebus[%08x]", dp->node);
 250
 251         /* Register with core */
 252         if (of_device_register(&dev->ofdev) != 0)
 253                 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 254                        dp->path_component_name);
 255
 256         if ((dp = dp->child) != NULL) {
 257                 dev->children = (struct linux_ebus_child *)
 258                         ebus_alloc(sizeof(struct linux_ebus_child));
 259
 260                 child = dev->children;
 261                 child->next = NULL;
 262                 child->parent = dev;
 263                 child->bus = dev->bus;
 264                 fill_ebus_child(dp, child);
 265
 266                 while ((dp = dp->sibling) != NULL) {
 267                         child->next = (struct linux_ebus_child *)
 268                                 ebus_alloc(sizeof(struct linux_ebus_child));
 269
 270                         child = child->next;
 271                         child->next = NULL;
 272                         child->parent = dev;
 273                         child->bus = dev->bus;
 274                         fill_ebus_child(dp, child);
 275                 }
 276         }
 277 }
 278
 279 void __init ebus_init(void)
 280 {
 281         const struct linux_prom_pci_registers *regs;
 282         struct linux_pbm_info *pbm;
 283         struct linux_ebus_device *dev;
 284         struct linux_ebus *ebus;
 285         struct ebus_system_entry *sp;
 286         struct pci_dev *pdev;
 287         struct pcidev_cookie *cookie;
 288         struct device_node *dp;
 289         struct resource *p;
 290         unsigned short pci_command;
 291         int len, reg, nreg;
 292         int num_ebus = 0;
 293
 294         dp = of_find_node_by_path("/");
 295         for (sp = ebus_blacklist; sp->esname != NULL; sp++) {
 296                 if (strcmp(dp->name, sp->esname) == 0) {
 297                         ebus_blackp = sp->ipt;
 298                         break;
 299                 }
 300         }
 301
 302         pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_EBUS, NULL);
 303         if (!pdev)
 304                 return;
 305
 306         cookie = pdev->sysdata;
 307         dp = cookie->prom_node;
 308
 309         ebus_chain = ebus = (struct linux_ebus *)
 310                         ebus_alloc(sizeof(struct linux_ebus));
 311         ebus->next = NULL;
 312
 313         while (dp) {
 314                 struct device_node *nd;
 315
 316                 ebus->prom_node = dp;
 317                 ebus->self = pdev;
 318                 ebus->parent = pbm = cookie->pbm;
 319
 320                 /* Enable BUS Master. */
 321                 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
 322                 pci_command |= PCI_COMMAND_MASTER;
 323                 pci_write_config_word(pdev, PCI_COMMAND, pci_command);
 324
 325                 regs = of_get_property(dp, "reg", &len);
 326                 if (!regs) {
 327                         prom_printf("%s: can't find reg property\n",
 328                                     __func__);
 329                         prom_halt();
 330                 }
 331                 nreg = len / sizeof(struct linux_prom_pci_registers);
 332
 333                 p = &ebus->self->resource[0];
 334                 for (reg = 0; reg < nreg; reg++) {
 335                         if (!(regs[reg].which_io & 0x03000000))
 336                                 continue;
 337
 338                         (p++)->start = regs[reg].phys_lo;
 339                 }
 340
 341                 ebus->ofdev.node = dp;
 342                 ebus->ofdev.dev.parent = &pdev->dev;
 343                 ebus->ofdev.dev.bus = &ebus_bus_type;
 344                 sprintf(ebus->ofdev.dev.bus_id, "ebus%d", num_ebus);
 345
 346                 /* Register with core */
 347                 if (of_device_register(&ebus->ofdev) != 0)
 348                         printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 349                                dp->path_component_name);
 350
 351
 352                 nd = dp->child;
 353                 if (!nd)
 354                         goto next_ebus;
 355
 356                 ebus->devices = (struct linux_ebus_device *)
 357                                 ebus_alloc(sizeof(struct linux_ebus_device));
 358
 359                 dev = ebus->devices;
 360                 dev->next = NULL;
 361                 dev->children = NULL;
 362                 dev->bus = ebus;
 363                 fill_ebus_device(nd, dev);
 364
 365                 while ((nd = nd->sibling) != NULL) {
 366                         dev->next = (struct linux_ebus_device *)
 367                                 ebus_alloc(sizeof(struct linux_ebus_device));
 368
 369                         dev = dev->next;
 370                         dev->next = NULL;
 371                         dev->children = NULL;
 372                         dev->bus = ebus;
 373                         fill_ebus_device(nd, dev);
 374                 }
 375
 376         next_ebus:
 377                 pdev = pci_get_device(PCI_VENDOR_ID_SUN,
 378                                        PCI_DEVICE_ID_SUN_EBUS, pdev);
 379                 if (!pdev)
 380                         break;
 381
 382                 cookie = pdev->sysdata;
 383                 dp = cookie->prom_node;
 384
 385                 ebus->next = (struct linux_ebus *)
 386                         ebus_alloc(sizeof(struct linux_ebus));
 387                 ebus = ebus->next;
 388                 ebus->next = NULL;
 389                 ++num_ebus;
 390         }
 391         if (pdev)
 392                 pci_dev_put(pdev);
 393 }