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); 427