arch/sparc/kernel/ebus.c

   1 /* $Id: ebus.c,v 1.20 2002/01/05 01:13:43 davem Exp $
   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 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 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(__FUNCTION__);
 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 void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_device *dev)
 148 {
 149         const struct linux_prom_registers *regs;
 150         struct linux_ebus_child *child;
 151         struct dev_archdata *sd;
 152         const int *irqs;
 153         int i, n, len;
 154         unsigned long baseaddr;
 155
 156         dev->prom_node = dp;
 157
 158         regs = of_get_property(dp, "reg", &len);
 159         if (len % sizeof(struct linux_prom_registers)) {
 160                 prom_printf("UGH: proplen for %s was %d, need multiple of %d\n",
 161                             dev->prom_node->name, len,
 162                             (int)sizeof(struct linux_prom_registers));
 163                 panic(__FUNCTION__);
 164         }
 165         dev->num_addrs = len / sizeof(struct linux_prom_registers);
 166
 167         for (i = 0; i < dev->num_addrs; i++) {
 168                 /*
 169                  * XXX Collect JE-1 PROM
 170                  *
 171                  * Example - JS-E with 3.11:
 172                  *  /ebus
 173                  *      regs
 174                  *        0x00000000, 0x0, 0x00000000, 0x0, 0x00000000,
 175                  *        0x82000010, 0x0, 0xf0000000, 0x0, 0x01000000,
 176                  *        0x82000014, 0x0, 0x38800000, 0x0, 0x00800000,
 177                  *      ranges
 178                  *        0x00, 0x00000000, 0x02000010, 0x0, 0x0, 0x01000000,
 179                  *        0x01, 0x01000000, 0x02000014, 0x0, 0x0, 0x00800000,
 180                  *  /ebus/8042
 181                  *      regs
 182                  *        0x00000001, 0x00300060, 0x00000008,
 183                  *        0x00000001, 0x00300060, 0x00000008,
 184                  */
 185                 n = regs[i].which_io;
 186                 if (n >= 4) {
 187                         /* XXX This is copied from old JE-1 by Gleb. */
 188                         n = (regs[i].which_io - 0x10) >> 2;
 189                 } else {
 190                         ;
 191                 }
 192
 193 /*
 194  * XXX Now as we have regions, why don't we make an on-demand allocation...
 195  */
 196                 dev->resource[i].start = 0;
 197                 if ((baseaddr = dev->bus->self->resource[n].start +
 198                     regs[i].phys_addr) != 0) {
 199                         /* dev->resource[i].name = dev->prom_name; */
 200                         if ((baseaddr = (unsigned long) ioremap(baseaddr,
 201                             regs[i].reg_size)) == 0) {
 202                                 panic("ebus: unable to remap dev %s",
 203                                       dev->prom_node->name);
 204                         }
 205                 }
 206                 dev->resource[i].start = baseaddr;      /* XXX Unaligned */
 207         }
 208
 209         for (i = 0; i < PROMINTR_MAX; i++)
 210                 dev->irqs[i] = PCI_IRQ_NONE;
 211
 212         if ((dev->irqs[0] = ebus_blacklist_irq(dev->prom_node->name)) != 0) {
 213                 dev->num_irqs = 1;
 214         } else {
 215                 irqs = of_get_property(dp, "interrupts", &len);
 216                 if (!irqs) {
 217                         dev->num_irqs = 0;
 218                         if ((dev->irqs[0] = dev->bus->self->irq) != 0) {
 219                                 dev->num_irqs = 1;
 220 /* P3 */ /* printk("EBUS: child %s irq %d from parent\n", dev->prom_name, dev->irqs[0]); */
 221                         }
 222                 } else {
 223                         dev->num_irqs = 1;  /* dev->num_irqs = len / sizeof(irqs[0]); */
 224                         if (irqs[0] == 0 || irqs[0] >= 8) {
 225                                 /* See above for the parent. XXX */
 226                                 printk("EBUS: %s got bad irq %d from PROM\n",
 227                                        dev->prom_node->name, irqs[0]);
 228                                 dev->num_irqs = 0;
 229                                 dev->irqs[0] = 0;
 230                         } else {
 231                                 dev->irqs[0] =
 232                                         pcic_pin_to_irq(irqs[0],
 233                                                         dev->prom_node->name);
 234                         }
 235                 }
 236         }
 237
 238         sd = &dev->ofdev.dev.archdata;
 239         sd->prom_node = dp;
 240         sd->op = &dev->ofdev;
 241         sd->iommu = dev->bus->ofdev.dev.parent->archdata.iommu;
 242
 243         dev->ofdev.node = dp;
 244         dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
 245         dev->ofdev.dev.bus = &ebus_bus_type;
 246         sprintf(dev->ofdev.dev.bus_id, "ebus[%08x]", dp->node);
 247
 248         /* Register with core */
 249         if (of_device_register(&dev->ofdev) != 0)
 250                 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 251                        dp->path_component_name);
 252
 253         if ((dp = dp->child) != NULL) {
 254                 dev->children = (struct linux_ebus_child *)
 255                         ebus_alloc(sizeof(struct linux_ebus_child));
 256
 257                 child = dev->children;
 258                 child->next = NULL;
 259                 child->parent = dev;
 260                 child->bus = dev->bus;
 261                 fill_ebus_child(dp, child);
 262
 263                 while ((dp = dp->sibling) != NULL) {
 264                         child->next = (struct linux_ebus_child *)
 265                                 ebus_alloc(sizeof(struct linux_ebus_child));
 266
 267                         child = child->next;
 268                         child->next = NULL;
 269                         child->parent = dev;
 270                         child->bus = dev->bus;
 271                         fill_ebus_child(dp, child);
 272                 }
 273         }
 274 }
 275
 276 void __init ebus_init(void)
 277 {
 278         const struct linux_prom_pci_registers *regs;
 279         struct linux_pbm_info *pbm;
 280         struct linux_ebus_device *dev;
 281         struct linux_ebus *ebus;
 282         struct ebus_system_entry *sp;
 283         struct pci_dev *pdev;
 284         struct pcidev_cookie *cookie;
 285         struct device_node *dp;
 286         struct resource *p;
 287         unsigned short pci_command;
 288         int len, reg, nreg;
 289         int num_ebus = 0;
 290
 291         dp = of_find_node_by_path("/");
 292         for (sp = ebus_blacklist; sp->esname != NULL; sp++) {
 293                 if (strcmp(dp->name, sp->esname) == 0) {
 294                         ebus_blackp = sp->ipt;
 295                         break;
 296                 }
 297         }
 298
 299         pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_EBUS, NULL);
 300         if (!pdev)
 301                 return;
 302
 303         cookie = pdev->sysdata;
 304         dp = cookie->prom_node;
 305
 306         ebus_chain = ebus = (struct linux_ebus *)
 307                         ebus_alloc(sizeof(struct linux_ebus));
 308         ebus->next = NULL;
 309
 310         while (dp) {
 311                 struct device_node *nd;
 312
 313                 ebus->prom_node = dp;
 314                 ebus->self = pdev;
 315                 ebus->parent = pbm = cookie->pbm;
 316
 317                 /* Enable BUS Master. */
 318                 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
 319                 pci_command |= PCI_COMMAND_MASTER;
 320                 pci_write_config_word(pdev, PCI_COMMAND, pci_command);
 321
 322                 regs = of_get_property(dp, "reg", &len);
 323                 if (!regs) {
 324                         prom_printf("%s: can't find reg property\n",
 325                                     __FUNCTION__);
 326                         prom_halt();
 327                 }
 328                 nreg = len / sizeof(struct linux_prom_pci_registers);
 329
 330                 p = &ebus->self->resource[0];
 331                 for (reg = 0; reg < nreg; reg++) {
 332                         if (!(regs[reg].which_io & 0x03000000))
 333                                 continue;
 334
 335                         (p++)->start = regs[reg].phys_lo;
 336                 }
 337
 338                 ebus->ofdev.node = dp;
 339                 ebus->ofdev.dev.parent = &pdev->dev;
 340                 ebus->ofdev.dev.bus = &ebus_bus_type;
 341                 sprintf(ebus->ofdev.dev.bus_id, "ebus%d", num_ebus);
 342
 343                 /* Register with core */
 344                 if (of_device_register(&ebus->ofdev) != 0)
 345                         printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 346                                dp->path_component_name);
 347
 348
 349                 nd = dp->child;
 350                 if (!nd)
 351                         goto next_ebus;
 352
 353                 ebus->devices = (struct linux_ebus_device *)
 354                                 ebus_alloc(sizeof(struct linux_ebus_device));
 355
 356                 dev = ebus->devices;
 357                 dev->next = NULL;
 358                 dev->children = NULL;
 359                 dev->bus = ebus;
 360                 fill_ebus_device(nd, dev);
 361
 362                 while ((nd = nd->sibling) != NULL) {
 363                         dev->next = (struct linux_ebus_device *)
 364                                 ebus_alloc(sizeof(struct linux_ebus_device));
 365
 366                         dev = dev->next;
 367                         dev->next = NULL;
 368                         dev->children = NULL;
 369                         dev->bus = ebus;
 370                         fill_ebus_device(nd, dev);
 371                 }
 372
 373         next_ebus:
 374                 pdev = pci_get_device(PCI_VENDOR_ID_SUN,
 375                                        PCI_DEVICE_ID_SUN_EBUS, pdev);
 376                 if (!pdev)
 377                         break;
 378
 379                 cookie = pdev->sysdata;
 380                 dp = cookie->prom_node;
 381
 382                 ebus->next = (struct linux_ebus *)
 383                         ebus_alloc(sizeof(struct linux_ebus));
 384                 ebus = ebus->next;
 385                 ebus->next = NULL;
 386                 ++num_ebus;
 387         }
 388         if (pdev)
 389                 pci_dev_put(pdev);
 390 }