1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/export.h> 3 #include <linux/kernel.h> 4 #include <linux/init.h> 5 #include <linux/slab.h> 6 7 #include <asm/addrspace.h> 8 #include <asm/paccess.h> 9 #include <asm/gio_device.h> 10 #include <asm/sgi/gio.h> 11 #include <asm/sgi/hpc3.h> 12 #include <asm/sgi/mc.h> 13 #include <asm/sgi/ip22.h> 14 15 static struct bus_type gio_bus_type; 16 17 static struct { 18 const char *name; 19 __u8 id; 20 } gio_name_table[] = { 21 { .name = "SGI Impact", .id = 0x10 }, 22 { .name = "Phobos G160", .id = 0x35 }, 23 { .name = "Phobos G130", .id = 0x36 }, 24 { .name = "Phobos G100", .id = 0x37 }, 25 { .name = "Set Engineering GFE", .id = 0x38 }, 26 /* fake IDs */ 27 { .name = "SGI Newport", .id = 0x7e }, 28 { .name = "SGI GR2/GR3", .id = 0x7f }, 29 }; 30 31 static void gio_bus_release(struct device *dev) 32 { 33 kfree(dev); 34 } 35 36 static struct device gio_bus = { 37 .init_name = "gio", 38 .release = &gio_bus_release, 39 }; 40 41 /** 42 * gio_match_device - Tell if an of_device structure has a matching 43 * gio_match structure 44 * @ids: array of of device match structures to search in 45 * @dev: the of device structure to match against 46 * 47 * Used by a driver to check whether an of_device present in the 48 * system is in its list of supported devices. 49 */ 50 static const struct gio_device_id * 51 gio_match_device(const struct gio_device_id *match, 52 const struct gio_device *dev) 53 { 54 const struct gio_device_id *ids; 55 56 for (ids = match; ids->id != 0xff; ids++) 57 if (ids->id == dev->id.id) 58 return ids; 59 60 return NULL; 61 } 62 63 struct gio_device *gio_dev_get(struct gio_device *dev) 64 { 65 struct device *tmp; 66 67 if (!dev) 68 return NULL; 69 tmp = get_device(&dev->dev); 70 if (tmp) 71 return to_gio_device(tmp); 72 else 73 return NULL; 74 } 75 EXPORT_SYMBOL_GPL(gio_dev_get); 76 77 void gio_dev_put(struct gio_device *dev) 78 { 79 if (dev) 80 put_device(&dev->dev); 81 } 82 EXPORT_SYMBOL_GPL(gio_dev_put); 83 84 /** 85 * gio_release_dev - free an gio device structure when all users of it are finished. 86 * @dev: device that's been disconnected 87 * 88 * Will be called only by the device core when all users of this gio device are 89 * done. 90 */ 91 void gio_release_dev(struct device *dev) 92 { 93 struct gio_device *giodev; 94 95 giodev = to_gio_device(dev); 96 kfree(giodev); 97 } 98 EXPORT_SYMBOL_GPL(gio_release_dev); 99 100 int gio_device_register(struct gio_device *giodev) 101 { 102 giodev->dev.bus = &gio_bus_type; 103 giodev->dev.parent = &gio_bus; 104 return device_register(&giodev->dev); 105 } 106 EXPORT_SYMBOL_GPL(gio_device_register); 107 108 void gio_device_unregister(struct gio_device *giodev) 109 { 110 device_unregister(&giodev->dev); 111 } 112 EXPORT_SYMBOL_GPL(gio_device_unregister); 113 114 static int gio_bus_match(struct device *dev, struct device_driver *drv) 115 { 116 struct gio_device *gio_dev = to_gio_device(dev); 117 struct gio_driver *gio_drv = to_gio_driver(drv); 118 119 return gio_match_device(gio_drv->id_table, gio_dev) != NULL; 120 } 121 122 static int gio_device_probe(struct device *dev) 123 { 124 int error = -ENODEV; 125 struct gio_driver *drv; 126 struct gio_device *gio_dev; 127 const struct gio_device_id *match; 128 129 drv = to_gio_driver(dev->driver); 130 gio_dev = to_gio_device(dev); 131 132 if (!drv->probe) 133 return error; 134 135 gio_dev_get(gio_dev); 136 137 match = gio_match_device(drv->id_table, gio_dev); 138 if (match) 139 error = drv->probe(gio_dev, match); 140 if (error) 141 gio_dev_put(gio_dev); 142 143 return error; 144 } 145 146 static void gio_device_remove(struct device *dev) 147 { 148 struct gio_device *gio_dev = to_gio_device(dev); 149 struct gio_driver *drv = to_gio_driver(dev->driver); 150 151 if (dev->driver && drv->remove) 152 drv->remove(gio_dev); 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 static DEVICE_ATTR_RO(modalias); 173 174 static ssize_t name_show(struct device *dev, 175 struct device_attribute *attr, char *buf) 176 { 177 struct gio_device *giodev; 178 179 giodev = to_gio_device(dev); 180 return sprintf(buf, "%s", giodev->name); 181 } 182 static DEVICE_ATTR_RO(name); 183 184 static ssize_t id_show(struct device *dev, 185 struct device_attribute *attr, char *buf) 186 { 187 struct gio_device *giodev; 188 189 giodev = to_gio_device(dev); 190 return sprintf(buf, "%x", giodev->id.id); 191 } 192 static DEVICE_ATTR_RO(id); 193 194 static struct attribute *gio_dev_attrs[] = { 195 &dev_attr_modalias.attr, 196 &dev_attr_name.attr, 197 &dev_attr_id.attr, 198 NULL, 199 }; 200 ATTRIBUTE_GROUPS(gio_dev); 201 202 static int gio_device_uevent(struct device *dev, struct kobj_uevent_env *env) 203 { 204 struct gio_device *gio_dev = to_gio_device(dev); 205 206 add_uevent_var(env, "MODALIAS=gio:%x", gio_dev->id.id); 207 return 0; 208 } 209 210 int gio_register_driver(struct gio_driver *drv) 211 { 212 /* initialize common driver fields */ 213 if (!drv->driver.name) 214 drv->driver.name = drv->name; 215 if (!drv->driver.owner) 216 drv->driver.owner = drv->owner; 217 drv->driver.bus = &gio_bus_type; 218 219 /* register with core */ 220 return driver_register(&drv->driver); 221 } 222 EXPORT_SYMBOL_GPL(gio_register_driver); 223 224 void gio_unregister_driver(struct gio_driver *drv) 225 { 226 driver_unregister(&drv->driver); 227 } 228 EXPORT_SYMBOL_GPL(gio_unregister_driver); 229 230 void gio_set_master(struct gio_device *dev) 231 { 232 u32 tmp = sgimc->giopar; 233 234 switch (dev->slotno) { 235 case 0: 236 tmp |= SGIMC_GIOPAR_MASTERGFX; 237 break; 238 case 1: 239 tmp |= SGIMC_GIOPAR_MASTEREXP0; 240 break; 241 case 2: 242 tmp |= SGIMC_GIOPAR_MASTEREXP1; 243 break; 244 } 245 sgimc->giopar = tmp; 246 } 247 EXPORT_SYMBOL_GPL(gio_set_master); 248 249 void ip22_gio_set_64bit(int slotno) 250 { 251 u32 tmp = sgimc->giopar; 252 253 switch (slotno) { 254 case 0: 255 tmp |= SGIMC_GIOPAR_GFX64; 256 break; 257 case 1: 258 tmp |= SGIMC_GIOPAR_EXP064; 259 break; 260 case 2: 261 tmp |= SGIMC_GIOPAR_EXP164; 262 break; 263 } 264 sgimc->giopar = tmp; 265 } 266 267 static int ip22_gio_id(unsigned long addr, u32 *res) 268 { 269 u8 tmp8; 270 u8 tmp16; 271 u32 tmp32; 272 u8 *ptr8; 273 u16 *ptr16; 274 u32 *ptr32; 275 276 ptr32 = (void *)CKSEG1ADDR(addr); 277 if (!get_dbe(tmp32, ptr32)) { 278 /* 279 * We got no DBE, but this doesn't mean anything. 280 * If GIO is pipelined (which can't be disabled 281 * for GFX slot) we don't get a DBE, but we see 282 * the transfer size as data. So we do an 8bit 283 * and a 16bit access and check whether the common 284 * data matches 285 */ 286 ptr8 = (void *)CKSEG1ADDR(addr + 3); 287 if (get_dbe(tmp8, ptr8)) { 288 /* 289 * 32bit access worked, but 8bit doesn't 290 * so we don't see phantom reads on 291 * a pipelined bus, but a real card which 292 * doesn't support 8 bit reads 293 */ 294 *res = tmp32; 295 return 1; 296 } 297 ptr16 = (void *)CKSEG1ADDR(addr + 2); 298 get_dbe(tmp16, ptr16); 299 if (tmp8 == (tmp16 & 0xff) && 300 tmp8 == (tmp32 & 0xff) && 301 tmp16 == (tmp32 & 0xffff)) { 302 *res = tmp32; 303 return 1; 304 } 305 } 306 return 0; /* nothing here */ 307 } 308 309 #define HQ2_MYSTERY_OFFS 0x6A07C 310 #define NEWPORT_USTATUS_OFFS 0xF133C 311 312 static int ip22_is_gr2(unsigned long addr) 313 { 314 u32 tmp; 315 u32 *ptr; 316 317 /* HQ2 only allows 32bit accesses */ 318 ptr = (void *)CKSEG1ADDR(addr + HQ2_MYSTERY_OFFS); 319 if (!get_dbe(tmp, ptr)) { 320 if (tmp == 0xdeadbeef) 321 return 1; 322 } 323 return 0; 324 } 325 326 327 static void ip22_check_gio(int slotno, unsigned long addr, int irq) 328 { 329 const char *name = "Unknown"; 330 struct gio_device *gio_dev; 331 u32 tmp; 332 __u8 id; 333 int i; 334 335 /* first look for GR2/GR3 by checking mystery register */ 336 if (ip22_is_gr2(addr)) 337 tmp = 0x7f; 338 else { 339 if (!ip22_gio_id(addr, &tmp)) { 340 /* 341 * no GIO signature at start address of slot 342 * since Newport doesn't have one, we check if 343 * user status register is readable 344 */ 345 if (ip22_gio_id(addr + NEWPORT_USTATUS_OFFS, &tmp)) 346 tmp = 0x7e; 347 else 348 tmp = 0; 349 } 350 } 351 if (tmp) { 352 id = GIO_ID(tmp); 353 if (tmp & GIO_32BIT_ID) { 354 if (tmp & GIO_64BIT_IFACE) 355 ip22_gio_set_64bit(slotno); 356 } 357 for (i = 0; i < ARRAY_SIZE(gio_name_table); i++) { 358 if (id == gio_name_table[i].id) { 359 name = gio_name_table[i].name; 360 break; 361 } 362 } 363 printk(KERN_INFO "GIO: slot %d : %s (id %x)\n", 364 slotno, name, id); 365 gio_dev = kzalloc(sizeof *gio_dev, GFP_KERNEL); 366 gio_dev->name = name; 367 gio_dev->slotno = slotno; 368 gio_dev->id.id = id; 369 gio_dev->resource.start = addr; 370 gio_dev->resource.end = addr + 0x3fffff; 371 gio_dev->resource.flags = IORESOURCE_MEM; 372 gio_dev->irq = irq; 373 dev_set_name(&gio_dev->dev, "%d", slotno); 374 gio_device_register(gio_dev); 375 } else 376 printk(KERN_INFO "GIO: slot %d : Empty\n", slotno); 377 } 378 379 static struct bus_type gio_bus_type = { 380 .name = "gio", 381 .dev_groups = gio_dev_groups, 382 .match = gio_bus_match, 383 .probe = gio_device_probe, 384 .remove = gio_device_remove, 385 .shutdown = gio_device_shutdown, 386 .uevent = gio_device_uevent, 387 }; 388 389 static struct resource gio_bus_resource = { 390 .start = GIO_SLOT_GFX_BASE, 391 .end = GIO_SLOT_GFX_BASE + 0x9fffff, 392 .name = "GIO Bus", 393 .flags = IORESOURCE_MEM, 394 }; 395 396 int __init ip22_gio_init(void) 397 { 398 unsigned int pbdma __maybe_unused; 399 int ret; 400 401 ret = device_register(&gio_bus); 402 if (ret) { 403 put_device(&gio_bus); 404 return ret; 405 } 406 407 ret = bus_register(&gio_bus_type); 408 if (!ret) { 409 request_resource(&iomem_resource, &gio_bus_resource); 410 printk(KERN_INFO "GIO: Probing bus...\n"); 411 412 if (ip22_is_fullhouse()) { 413 /* Indigo2 */ 414 ip22_check_gio(0, GIO_SLOT_GFX_BASE, SGI_GIO_1_IRQ); 415 ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIO_1_IRQ); 416 } else { 417 /* Indy/Challenge S */ 418 if (get_dbe(pbdma, (unsigned int *)&hpc3c1->pbdma[1])) 419 ip22_check_gio(0, GIO_SLOT_GFX_BASE, 420 SGI_GIO_0_IRQ); 421 ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIOEXP0_IRQ); 422 ip22_check_gio(2, GIO_SLOT_EXP1_BASE, SGI_GIOEXP1_IRQ); 423 } 424 } else 425 device_unregister(&gio_bus); 426 427 return ret; 428 } 429 430 subsys_initcall(ip22_gio_init); 431