arch/mips/sgi-ip22/ip22-gio.c

   1 #include <linux/export.h>
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/slab.h>
   5
   6 #include <asm/addrspace.h>
   7 #include <asm/paccess.h>
   8 #include <asm/gio_device.h>
   9 #include <asm/sgi/gio.h>
  10 #include <asm/sgi/hpc3.h>
  11 #include <asm/sgi/mc.h>
  12 #include <asm/sgi/ip22.h>
  13
  14 static struct bus_type gio_bus_type;
  15
  16 static struct {
  17         const char *name;
  18         __u8       id;
  19 } gio_name_table[] = {
  20         { .name = "SGI Impact", .id = 0x10 },
  21         { .name = "Phobos G160", .id = 0x35 },
  22         { .name = "Phobos G130", .id = 0x36 },
  23         { .name = "Phobos G100", .id = 0x37 },
  24         { .name = "Set Engineering GFE", .id = 0x38 },
  25         /* fake IDs */
  26         { .name = "SGI Newport", .id = 0x7e },
  27         { .name = "SGI GR2/GR3", .id = 0x7f },
  28 };
  29
  30 static void gio_bus_release(struct device *dev)
  31 {
  32         kfree(dev);
  33 }
  34
  35 static struct device gio_bus = {
  36         .init_name = "gio",
  37         .release = &gio_bus_release,
  38 };
  39
  40 /**
  41  * gio_match_device - Tell if an of_device structure has a matching
  42  * gio_match structure
  43  * @ids: array of of device match structures to search in
  44  * @dev: the of device structure to match against
  45  *
  46  * Used by a driver to check whether an of_device present in the
  47  * system is in its list of supported devices.
  48  */
  49 const struct gio_device_id *gio_match_device(const struct gio_device_id *match,
  50                      const struct gio_device *dev)
  51 {
  52         const struct gio_device_id *ids;
  53
  54         for (ids = match; ids->id != 0xff; ids++)
  55                 if (ids->id == dev->id.id)
  56                         return ids;
  57
  58         return NULL;
  59 }
  60 EXPORT_SYMBOL_GPL(gio_match_device);
  61
  62 struct gio_device *gio_dev_get(struct gio_device *dev)
  63 {
  64         struct device *tmp;
  65
  66         if (!dev)
  67                 return NULL;
  68         tmp = get_device(&dev->dev);
  69         if (tmp)
  70                 return to_gio_device(tmp);
  71         else
  72                 return NULL;
  73 }
  74 EXPORT_SYMBOL_GPL(gio_dev_get);
  75
  76 void gio_dev_put(struct gio_device *dev)
  77 {
  78         if (dev)
  79                 put_device(&dev->dev);
  80 }
  81 EXPORT_SYMBOL_GPL(gio_dev_put);
  82
  83 /**
  84  * gio_release_dev - free an gio device structure when all users of it are finished.
  85  * @dev: device that's been disconnected
  86  *
  87  * Will be called only by the device core when all users of this gio device are
  88  * done.
  89  */
  90 void gio_release_dev(struct device *dev)
  91 {
  92         struct gio_device *giodev;
  93
  94         giodev = to_gio_device(dev);
  95         kfree(giodev);
  96 }
  97 EXPORT_SYMBOL_GPL(gio_release_dev);
  98
  99 int gio_device_register(struct gio_device *giodev)
 100 {
 101         giodev->dev.bus = &gio_bus_type;
 102         giodev->dev.parent = &gio_bus;
 103         return device_register(&giodev->dev);
 104 }
 105 EXPORT_SYMBOL_GPL(gio_device_register);
 106
 107 void gio_device_unregister(struct gio_device *giodev)
 108 {
 109         device_unregister(&giodev->dev);
 110 }
 111 EXPORT_SYMBOL_GPL(gio_device_unregister);
 112
 113 static int gio_bus_match(struct device *dev, struct device_driver *drv)
 114 {
 115         struct gio_device *gio_dev = to_gio_device(dev);
 116         struct gio_driver *gio_drv = to_gio_driver(drv);
 117
 118         return gio_match_device(gio_drv->id_table, gio_dev) != NULL;
 119 }
 120
 121 static int gio_device_probe(struct device *dev)
 122 {
 123         int error = -ENODEV;
 124         struct gio_driver *drv;
 125         struct gio_device *gio_dev;
 126         const struct gio_device_id *match;
 127
 128         drv = to_gio_driver(dev->driver);
 129         gio_dev = to_gio_device(dev);
 130
 131         if (!drv->probe)
 132                 return error;
 133
 134         gio_dev_get(gio_dev);
 135
 136         match = gio_match_device(drv->id_table, gio_dev);
 137         if (match)
 138                 error = drv->probe(gio_dev, match);
 139         if (error)
 140                 gio_dev_put(gio_dev);
 141
 142         return error;
 143 }
 144
 145 static int gio_device_remove(struct device *dev)
 146 {
 147         struct gio_device *gio_dev = to_gio_device(dev);
 148         struct gio_driver *drv = to_gio_driver(dev->driver);
 149
 150         if (dev->driver && drv->remove)
 151                 drv->remove(gio_dev);
 152         return 0;
 153 }
 154
 155 static void gio_device_shutdown(struct device *dev)
 156 {
 157         struct gio_device *gio_dev = to_gio_device(dev);
 158         struct gio_driver *drv = to_gio_driver(dev->driver);
 159
 160         if (dev->driver && drv->shutdown)
 161                 drv->shutdown(gio_dev);
 162 }
 163
 164 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 165                              char *buf)
 166 {
 167         struct gio_device *gio_dev = to_gio_device(dev);
 168         int len = snprintf(buf, PAGE_SIZE, "gio:%x\n", gio_dev->id.id);
 169
 170         return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
 171 }
 172
 173 static ssize_t name_show(struct device *dev,
 174                          struct device_attribute *attr, char *buf)
 175 {
 176         struct gio_device *giodev;
 177
 178         giodev = to_gio_device(dev);
 179         return sprintf(buf, "%s", giodev->name);
 180 }
 181
 182 static ssize_t id_show(struct device *dev,
 183                        struct device_attribute *attr, char *buf)
 184 {
 185         struct gio_device *giodev;
 186
 187         giodev = to_gio_device(dev);
 188         return sprintf(buf, "%x", giodev->id.id);
 189 }
 190
 191 static struct device_attribute gio_dev_attrs[] = {
 192         __ATTR_RO(modalias),
 193         __ATTR_RO(name),
 194         __ATTR_RO(id),
 195         __ATTR_NULL,
 196 };
 197
 198 static int gio_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 199 {
 200         struct gio_device *gio_dev = to_gio_device(dev);
 201
 202         add_uevent_var(env, "MODALIAS=gio:%x", gio_dev->id.id);
 203         return 0;
 204 }
 205
 206 int gio_register_driver(struct gio_driver *drv)
 207 {
 208         /* initialize common driver fields */
 209         if (!drv->driver.name)
 210                 drv->driver.name = drv->name;
 211         if (!drv->driver.owner)
 212                 drv->driver.owner = drv->owner;
 213         drv->driver.bus = &gio_bus_type;
 214
 215         /* register with core */
 216         return driver_register(&drv->driver);
 217 }
 218 EXPORT_SYMBOL_GPL(gio_register_driver);
 219
 220 void gio_unregister_driver(struct gio_driver *drv)
 221 {
 222         driver_unregister(&drv->driver);
 223 }
 224 EXPORT_SYMBOL_GPL(gio_unregister_driver);
 225
 226 void gio_set_master(struct gio_device *dev)
 227 {
 228         u32 tmp = sgimc->giopar;
 229
 230         switch (dev->slotno) {
 231         case 0:
 232                 tmp |= SGIMC_GIOPAR_MASTERGFX;
 233                 break;
 234         case 1:
 235                 tmp |= SGIMC_GIOPAR_MASTEREXP0;
 236                 break;
 237         case 2:
 238                 tmp |= SGIMC_GIOPAR_MASTEREXP1;
 239                 break;
 240         }
 241         sgimc->giopar = tmp;
 242 }
 243 EXPORT_SYMBOL_GPL(gio_set_master);
 244
 245 void ip22_gio_set_64bit(int slotno)
 246 {
 247         u32 tmp = sgimc->giopar;
 248
 249         switch (slotno) {
 250         case 0:
 251                 tmp |= SGIMC_GIOPAR_GFX64;
 252                 break;
 253         case 1:
 254                 tmp |= SGIMC_GIOPAR_EXP064;
 255                 break;
 256         case 2:
 257                 tmp |= SGIMC_GIOPAR_EXP164;
 258                 break;
 259         }
 260         sgimc->giopar = tmp;
 261 }
 262
 263 static int ip22_gio_id(unsigned long addr, u32 *res)
 264 {
 265         u8 tmp8;
 266         u8 tmp16;
 267         u32 tmp32;
 268         u8 *ptr8;
 269         u16 *ptr16;
 270         u32 *ptr32;
 271
 272         ptr32 = (void *)CKSEG1ADDR(addr);
 273         if (!get_dbe(tmp32, ptr32)) {
 274                 /*
 275                  * We got no DBE, but this doesn't mean anything.
 276                  * If GIO is pipelined (which can't be disabled
 277                  * for GFX slot) we don't get a DBE, but we see
 278                  * the transfer size as data. So we do an 8bit
 279                  * and a 16bit access and check whether the common
 280                  * data matches
 281                  */
 282                 ptr8 = (void *)CKSEG1ADDR(addr + 3);
 283                 if (get_dbe(tmp8, ptr8)) {
 284                         /*
 285                          * 32bit access worked, but 8bit doesn't
 286                          * so we don't see phantom reads on
 287                          * a pipelined bus, but a real card which
 288                          * doesn't support 8 bit reads
 289                          */
 290                         *res = tmp32;
 291                         return 1;
 292                 }
 293                 ptr16 = (void *)CKSEG1ADDR(addr + 2);
 294                 get_dbe(tmp16, ptr16);
 295                 if (tmp8 == (tmp16 & 0xff) &&
 296                     tmp8 == (tmp32 & 0xff) &&
 297                     tmp16 == (tmp32 & 0xffff)) {
 298                         *res = tmp32;
 299                         return 1;
 300                 }
 301         }
 302         return 0; /* nothing here */
 303 }
 304
 305 #define HQ2_MYSTERY_OFFS       0x6A07C
 306 #define NEWPORT_USTATUS_OFFS   0xF133C
 307
 308 static int ip22_is_gr2(unsigned long addr)
 309 {
 310         u32 tmp;
 311         u32 *ptr;
 312
 313         /* HQ2 only allows 32bit accesses */
 314         ptr = (void *)CKSEG1ADDR(addr + HQ2_MYSTERY_OFFS);
 315         if (!get_dbe(tmp, ptr)) {
 316                 if (tmp == 0xdeadbeef)
 317                         return 1;
 318         }
 319         return 0;
 320 }
 321
 322
 323 static void ip22_check_gio(int slotno, unsigned long addr, int irq)
 324 {
 325         const char *name = "Unknown";
 326         struct gio_device *gio_dev;
 327         u32 tmp;
 328         __u8 id;
 329         int i;
 330
 331         /* first look for GR2/GR3 by checking mystery register */
 332         if (ip22_is_gr2(addr))
 333                 tmp = 0x7f;
 334         else {
 335                 if (!ip22_gio_id(addr, &tmp)) {
 336                         /*
 337                          * no GIO signature at start address of slot
 338                          * since Newport doesn't have one, we check if
 339                          * user status register is readable
 340                          */
 341                         if (ip22_gio_id(addr + NEWPORT_USTATUS_OFFS, &tmp))
 342                                 tmp = 0x7e;
 343                         else
 344                                 tmp = 0;
 345                 }
 346         }
 347         if (tmp) {
 348                 id = GIO_ID(tmp);
 349                 if (tmp & GIO_32BIT_ID) {
 350                         if (tmp & GIO_64BIT_IFACE)
 351                                 ip22_gio_set_64bit(slotno);
 352                 }
 353                 for (i = 0; i < ARRAY_SIZE(gio_name_table); i++) {
 354                         if (id == gio_name_table[i].id) {
 355                                 name = gio_name_table[i].name;
 356                                 break;
 357                         }
 358                 }
 359                 printk(KERN_INFO "GIO: slot %d : %s (id %x)\n",
 360                        slotno, name, id);
 361                 gio_dev = kzalloc(sizeof *gio_dev, GFP_KERNEL);
 362                 gio_dev->name = name;
 363                 gio_dev->slotno = slotno;
 364                 gio_dev->id.id = id;
 365                 gio_dev->resource.start = addr;
 366                 gio_dev->resource.end = addr + 0x3fffff;
 367                 gio_dev->resource.flags = IORESOURCE_MEM;
 368                 gio_dev->irq = irq;
 369                 dev_set_name(&gio_dev->dev, "%d", slotno);
 370                 gio_device_register(gio_dev);
 371         } else
 372                 printk(KERN_INFO "GIO: slot %d : Empty\n", slotno);
 373 }
 374
 375 static struct bus_type gio_bus_type = {
 376         .name      = "gio",
 377         .dev_attrs = gio_dev_attrs,
 378         .match     = gio_bus_match,
 379         .probe     = gio_device_probe,
 380         .remove    = gio_device_remove,
 381         .shutdown  = gio_device_shutdown,
 382         .uevent    = gio_device_uevent,
 383 };
 384
 385 static struct resource gio_bus_resource = {
 386         .start = GIO_SLOT_GFX_BASE,
 387         .end   = GIO_SLOT_GFX_BASE + 0x9fffff,
 388         .name  = "GIO Bus",
 389         .flags = IORESOURCE_MEM,
 390 };
 391
 392 int __init ip22_gio_init(void)
 393 {
 394         unsigned int pbdma __maybe_unused;
 395         int ret;
 396
 397         ret = device_register(&gio_bus);
 398         if (ret) {
 399                 put_device(&gio_bus);
 400                 return ret;
 401         }
 402
 403         ret = bus_register(&gio_bus_type);
 404         if (!ret) {
 405                 request_resource(&iomem_resource, &gio_bus_resource);
 406                 printk(KERN_INFO "GIO: Probing bus...\n");
 407
 408                 if (ip22_is_fullhouse()) {
 409                         /* Indigo2 */
 410                         ip22_check_gio(0, GIO_SLOT_GFX_BASE, SGI_GIO_1_IRQ);
 411                         ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIO_1_IRQ);
 412                 } else {
 413                         /* Indy/Challenge S */
 414                         if (get_dbe(pbdma, (unsigned int *)&hpc3c1->pbdma[1]))
 415                                 ip22_check_gio(0, GIO_SLOT_GFX_BASE,
 416                                                SGI_GIO_0_IRQ);
 417                         ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIOEXP0_IRQ);
 418                         ip22_check_gio(2, GIO_SLOT_EXP1_BASE, SGI_GIOEXP1_IRQ);
 419                 }
 420         } else
 421                 device_unregister(&gio_bus);
 422
 423         return ret;
 424 }
 425
 426 subsys_initcall(ip22_gio_init);