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/config.h>
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/system.h>
  18 #include <asm/page.h>
  19 #include <asm/pbm.h>
  20 #include <asm/ebus.h>
  21 #include <asm/io.h>
  22 #include <asm/oplib.h>
  23 #include <asm/bpp.h>
  24
  25 struct linux_ebus *ebus_chain = 0;
  26
  27 /* We are together with pcic.c under CONFIG_PCI. */
  28 extern unsigned int pcic_pin_to_irq(unsigned int, 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         { 0, 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         { 0, 0 }
  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(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(int node, struct linux_prom_registers *preg,
  87                                 struct linux_ebus_child *dev)
  88 {
  89         int regs[PROMREG_MAX];
  90         int irqs[PROMREG_MAX];
  91         char lbuf[128];
  92         int i, len;
  93
  94         dev->prom_node = node;
  95         prom_getstring(node, "name", lbuf, sizeof(lbuf));
  96         strcpy(dev->prom_name, lbuf);
  97
  98         len = prom_getproperty(node, "reg", (void *)regs, sizeof(regs));
  99         if (len == -1) len = 0;
 100         dev->num_addrs = len / sizeof(regs[0]);
 101
 102         for (i = 0; i < dev->num_addrs; i++) {
 103                 if (regs[i] >= dev->parent->num_addrs) {
 104                         prom_printf("UGH: property for %s was %d, need < %d\n",
 105                                     dev->prom_name, len, dev->parent->num_addrs);
 106                         panic(__FUNCTION__);
 107                 }
 108                 dev->resource[i].start = dev->parent->resource[regs[i]].start; /* XXX resource */
 109         }
 110
 111         for (i = 0; i < PROMINTR_MAX; i++)
 112                 dev->irqs[i] = PCI_IRQ_NONE;
 113
 114         if ((dev->irqs[0] = ebus_blacklist_irq(dev->prom_name)) != 0) {
 115                 dev->num_irqs = 1;
 116         } else if ((len = prom_getproperty(node, "interrupts",
 117             (char *)&irqs, sizeof(irqs))) == -1 || len == 0) {
 118                 dev->num_irqs = 0;
 119                 dev->irqs[0] = 0;
 120                 if (dev->parent->num_irqs != 0) {
 121                         dev->num_irqs = 1;
 122                         dev->irqs[0] = dev->parent->irqs[0];
 123 /* P3 */ /* printk("EBUS: dev %s irq %d from parent\n", dev->prom_name, dev->irqs[0]); */
 124                 }
 125         } else {
 126                 dev->num_irqs = len / sizeof(irqs[0]);
 127                 if (irqs[0] == 0 || irqs[0] >= 8) {
 128                         /*
 129                          * XXX Zero is a valid pin number...
 130                          * This works as long as Ebus is not wired to INTA#.
 131                          */
 132                         printk("EBUS: %s got bad irq %d from PROM\n",
 133                             dev->prom_name, irqs[0]);
 134                         dev->num_irqs = 0;
 135                         dev->irqs[0] = 0;
 136                 } else {
 137                         dev->irqs[0] = pcic_pin_to_irq(irqs[0], dev->prom_name);
 138                 }
 139         }
 140 }
 141
 142 void __init fill_ebus_device(int node, struct linux_ebus_device *dev)
 143 {
 144         struct linux_prom_registers regs[PROMREG_MAX];
 145         struct linux_ebus_child *child;
 146         int irqs[PROMINTR_MAX];
 147         char lbuf[128];
 148         int i, n, len;
 149         unsigned long baseaddr;
 150
 151         dev->prom_node = node;
 152         prom_getstring(node, "name", lbuf, sizeof(lbuf));
 153         strcpy(dev->prom_name, lbuf);
 154
 155         len = prom_getproperty(node, "reg", (void *)regs, sizeof(regs));
 156         if (len % sizeof(struct linux_prom_registers)) {
 157                 prom_printf("UGH: proplen for %s was %d, need multiple of %d\n",
 158                             dev->prom_name, len,
 159                             (int)sizeof(struct linux_prom_registers));
 160                 panic(__FUNCTION__);
 161         }
 162         dev->num_addrs = len / sizeof(struct linux_prom_registers);
 163
 164         for (i = 0; i < dev->num_addrs; i++) {
 165                 /*
 166                  * XXX Collect JE-1 PROM
 167                  *
 168                  * Example - JS-E with 3.11:
 169                  *  /ebus
 170                  *      regs
 171                  *        0x00000000, 0x0, 0x00000000, 0x0, 0x00000000,
 172                  *        0x82000010, 0x0, 0xf0000000, 0x0, 0x01000000,
 173                  *        0x82000014, 0x0, 0x38800000, 0x0, 0x00800000,
 174                  *      ranges
 175                  *        0x00, 0x00000000, 0x02000010, 0x0, 0x0, 0x01000000,
 176                  *        0x01, 0x01000000, 0x02000014, 0x0, 0x0, 0x00800000,
 177                  *  /ebus/8042
 178                  *      regs
 179                  *        0x00000001, 0x00300060, 0x00000008,
 180                  *        0x00000001, 0x00300060, 0x00000008,
 181                  */
 182                 n = regs[i].which_io;
 183                 if (n >= 4) {
 184                         /* XXX This is copied from old JE-1 by Gleb. */
 185                         n = (regs[i].which_io - 0x10) >> 2;
 186                 } else {
 187                         ;
 188                 }
 189
 190 /*
 191  * XXX Now as we have regions, why don't we make an on-demand allocation...
 192  */
 193                 dev->resource[i].start = 0;
 194                 if ((baseaddr = dev->bus->self->resource[n].start +
 195                     regs[i].phys_addr) != 0) {
 196                         /* dev->resource[i].name = dev->prom_name; */
 197                         if ((baseaddr = (unsigned long) ioremap(baseaddr,
 198                             regs[i].reg_size)) == 0) {
 199                                 panic("ebus: unable to remap dev %s",
 200                                     dev->prom_name);
 201                         }
 202                 }
 203                 dev->resource[i].start = baseaddr;      /* XXX Unaligned */
 204         }
 205
 206         for (i = 0; i < PROMINTR_MAX; i++)
 207                 dev->irqs[i] = PCI_IRQ_NONE;
 208
 209         if ((dev->irqs[0] = ebus_blacklist_irq(dev->prom_name)) != 0) {
 210                 dev->num_irqs = 1;
 211         } else if ((len = prom_getproperty(node, "interrupts",
 212             (char *)&irqs, sizeof(irqs))) == -1 || len == 0) {
 213                 dev->num_irqs = 0;
 214                 if ((dev->irqs[0] = dev->bus->self->irq) != 0) {
 215                          dev->num_irqs = 1;
 216 /* P3 */ /* printk("EBUS: child %s irq %d from parent\n", dev->prom_name, dev->irqs[0]); */
 217                 }
 218         } else {
 219                 dev->num_irqs = 1;  /* dev->num_irqs = len / sizeof(irqs[0]); */
 220                 if (irqs[0] == 0 || irqs[0] >= 8) {
 221                         /* See above for the parent. XXX */
 222                         printk("EBUS: %s got bad irq %d from PROM\n",
 223                             dev->prom_name, irqs[0]);
 224                         dev->num_irqs = 0;
 225                         dev->irqs[0] = 0;
 226                 } else {
 227                         dev->irqs[0] = pcic_pin_to_irq(irqs[0], dev->prom_name);
 228                 }
 229         }
 230
 231         if ((node = prom_getchild(node))) {
 232                 dev->children = (struct linux_ebus_child *)
 233                         ebus_alloc(sizeof(struct linux_ebus_child));
 234
 235                 child = dev->children;
 236                 child->next = 0;
 237                 child->parent = dev;
 238                 child->bus = dev->bus;
 239                 fill_ebus_child(node, &regs[0], child);
 240
 241                 while ((node = prom_getsibling(node)) != 0) {
 242                         child->next = (struct linux_ebus_child *)
 243                                 ebus_alloc(sizeof(struct linux_ebus_child));
 244
 245                         child = child->next;
 246                         child->next = 0;
 247                         child->parent = dev;
 248                         child->bus = dev->bus;
 249                         fill_ebus_child(node, &regs[0], child);
 250                 }
 251         }
 252 }
 253
 254 void __init ebus_init(void)
 255 {
 256         struct linux_prom_pci_registers regs[PROMREG_MAX];
 257         struct linux_pbm_info *pbm;
 258         struct linux_ebus_device *dev;
 259         struct linux_ebus *ebus;
 260         struct ebus_system_entry *sp;
 261         struct pci_dev *pdev;
 262         struct pcidev_cookie *cookie;
 263         char lbuf[128];
 264         unsigned long addr, *base;
 265         unsigned short pci_command;
 266         int nd, len, ebusnd;
 267         int reg, nreg;
 268         int num_ebus = 0;
 269
 270         prom_getstring(prom_root_node, "name", lbuf, sizeof(lbuf));
 271         for (sp = ebus_blacklist; sp->esname != NULL; sp++) {
 272                 if (strcmp(lbuf, sp->esname) == 0) {
 273                         ebus_blackp = sp->ipt;
 274                         break;
 275                 }
 276         }
 277
 278         pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_EBUS, 0);
 279         if (!pdev) {
 280                 return;
 281         }
 282         cookie = pdev->sysdata;
 283         ebusnd = cookie->prom_node;
 284
 285         ebus_chain = ebus = (struct linux_ebus *)
 286                         ebus_alloc(sizeof(struct linux_ebus));
 287         ebus->next = 0;
 288
 289         while (ebusnd) {
 290
 291                 prom_getstring(ebusnd, "name", lbuf, sizeof(lbuf));
 292                 ebus->prom_node = ebusnd;
 293                 strcpy(ebus->prom_name, lbuf);
 294                 ebus->self = pdev;
 295                 ebus->parent = pbm = cookie->pbm;
 296
 297                 /* Enable BUS Master. */
 298                 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
 299                 pci_command |= PCI_COMMAND_MASTER;
 300                 pci_write_config_word(pdev, PCI_COMMAND, pci_command);
 301
 302                 len = prom_getproperty(ebusnd, "reg", (void *)regs,
 303                                        sizeof(regs));
 304                 if (len == 0 || len == -1) {
 305                         prom_printf("%s: can't find reg property\n",
 306                                     __FUNCTION__);
 307                         prom_halt();
 308                 }
 309                 nreg = len / sizeof(struct linux_prom_pci_registers);
 310
 311                 base = &ebus->self->resource[0].start;
 312                 for (reg = 0; reg < nreg; reg++) {
 313                         if (!(regs[reg].which_io & 0x03000000))
 314                                 continue;
 315
 316                         addr = regs[reg].phys_lo;
 317                         *base++ = addr;
 318                 }
 319
 320                 nd = prom_getchild(ebusnd);
 321                 if (!nd)
 322                         goto next_ebus;
 323
 324                 ebus->devices = (struct linux_ebus_device *)
 325                                 ebus_alloc(sizeof(struct linux_ebus_device));
 326
 327                 dev = ebus->devices;
 328                 dev->next = 0;
 329                 dev->children = 0;
 330                 dev->bus = ebus;
 331                 fill_ebus_device(nd, dev);
 332
 333                 while ((nd = prom_getsibling(nd)) != 0) {
 334                         dev->next = (struct linux_ebus_device *)
 335                                 ebus_alloc(sizeof(struct linux_ebus_device));
 336
 337                         dev = dev->next;
 338                         dev->next = 0;
 339                         dev->children = 0;
 340                         dev->bus = ebus;
 341                         fill_ebus_device(nd, dev);
 342                 }
 343
 344         next_ebus:
 345                 pdev = pci_get_device(PCI_VENDOR_ID_SUN,
 346                                        PCI_DEVICE_ID_SUN_EBUS, pdev);
 347                 if (!pdev)
 348                         break;
 349
 350                 cookie = pdev->sysdata;
 351                 ebusnd = cookie->prom_node;
 352
 353                 ebus->next = (struct linux_ebus *)
 354                         ebus_alloc(sizeof(struct linux_ebus));
 355                 ebus = ebus->next;
 356                 ebus->next = 0;
 357                 ++num_ebus;
 358         }
 359         if (pdev)
 360                 pci_dev_put(pdev);
 361 }