1 #include <linux/kernel.h> 2 #include <linux/serial.h> 3 #include <linux/serial_8250.h> 4 #include <linux/serial_core.h> 5 #include <linux/console.h> 6 #include <linux/pci.h> 7 #include <linux/of_device.h> 8 #include <asm/io.h> 9 #include <asm/mmu.h> 10 #include <asm/prom.h> 11 #include <asm/serial.h> 12 #include <asm/udbg.h> 13 #include <asm/pci-bridge.h> 14 #include <asm/ppc-pci.h> 15 16 #undef DEBUG 17 18 #ifdef DEBUG 19 #define DBG(fmt...) do { printk(fmt); } while(0) 20 #else 21 #define DBG(fmt...) do { } while(0) 22 #endif 23 24 #define MAX_LEGACY_SERIAL_PORTS 8 25 26 static struct plat_serial8250_port 27 legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; 28 static struct legacy_serial_info { 29 struct device_node *np; 30 unsigned int speed; 31 unsigned int clock; 32 int irq_check_parent; 33 phys_addr_t taddr; 34 } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; 35 36 static struct __initdata of_device_id legacy_serial_parents[] = { 37 {.type = "soc",}, 38 {.type = "tsi-bridge",}, 39 {.type = "opb", }, 40 {.compatible = "ibm,opb",}, 41 {.compatible = "simple-bus",}, 42 {.compatible = "wrs,epld-localbus",}, 43 {}, 44 }; 45 46 static unsigned int legacy_serial_count; 47 static int legacy_serial_console = -1; 48 49 static int __init add_legacy_port(struct device_node *np, int want_index, 50 int iotype, phys_addr_t base, 51 phys_addr_t taddr, unsigned long irq, 52 upf_t flags, int irq_check_parent) 53 { 54 const u32 *clk, *spd; 55 u32 clock = BASE_BAUD * 16; 56 int index; 57 58 /* get clock freq. if present */ 59 clk = of_get_property(np, "clock-frequency", NULL); 60 if (clk && *clk) 61 clock = *clk; 62 63 /* get default speed if present */ 64 spd = of_get_property(np, "current-speed", NULL); 65 66 /* If we have a location index, then try to use it */ 67 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) 68 index = want_index; 69 else 70 index = legacy_serial_count; 71 72 /* if our index is still out of range, that mean that 73 * array is full, we could scan for a free slot but that 74 * make little sense to bother, just skip the port 75 */ 76 if (index >= MAX_LEGACY_SERIAL_PORTS) 77 return -1; 78 if (index >= legacy_serial_count) 79 legacy_serial_count = index + 1; 80 81 /* Check if there is a port who already claimed our slot */ 82 if (legacy_serial_infos[index].np != 0) { 83 /* if we still have some room, move it, else override */ 84 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { 85 printk(KERN_DEBUG "Moved legacy port %d -> %d\n", 86 index, legacy_serial_count); 87 legacy_serial_ports[legacy_serial_count] = 88 legacy_serial_ports[index]; 89 legacy_serial_infos[legacy_serial_count] = 90 legacy_serial_infos[index]; 91 legacy_serial_count++; 92 } else { 93 printk(KERN_DEBUG "Replacing legacy port %d\n", index); 94 } 95 } 96 97 /* Now fill the entry */ 98 memset(&legacy_serial_ports[index], 0, 99 sizeof(struct plat_serial8250_port)); 100 if (iotype == UPIO_PORT) 101 legacy_serial_ports[index].iobase = base; 102 else 103 legacy_serial_ports[index].mapbase = base; 104 legacy_serial_ports[index].iotype = iotype; 105 legacy_serial_ports[index].uartclk = clock; 106 legacy_serial_ports[index].irq = irq; 107 legacy_serial_ports[index].flags = flags; 108 legacy_serial_infos[index].taddr = taddr; 109 legacy_serial_infos[index].np = of_node_get(np); 110 legacy_serial_infos[index].clock = clock; 111 legacy_serial_infos[index].speed = spd ? *spd : 0; 112 legacy_serial_infos[index].irq_check_parent = irq_check_parent; 113 114 printk(KERN_DEBUG "Found legacy serial port %d for %s\n", 115 index, np->full_name); 116 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", 117 (iotype == UPIO_PORT) ? "port" : "mem", 118 (unsigned long long)base, (unsigned long long)taddr, irq, 119 legacy_serial_ports[index].uartclk, 120 legacy_serial_infos[index].speed); 121 122 return index; 123 } 124 125 static int __init add_legacy_soc_port(struct device_node *np, 126 struct device_node *soc_dev) 127 { 128 u64 addr; 129 const u32 *addrp; 130 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ 131 | UPF_FIXED_PORT; 132 struct device_node *tsi = of_get_parent(np); 133 134 /* We only support ports that have a clock frequency properly 135 * encoded in the device-tree. 136 */ 137 if (of_get_property(np, "clock-frequency", NULL) == NULL) 138 return -1; 139 140 /* if reg-shift or offset, don't try to use it */ 141 if ((of_get_property(np, "reg-shift", NULL) != NULL) || 142 (of_get_property(np, "reg-offset", NULL) != NULL)) 143 return -1; 144 145 /* if rtas uses this device, don't try to use it as well */ 146 if (of_get_property(np, "used-by-rtas", NULL) != NULL) 147 return -1; 148 149 /* Get the address */ 150 addrp = of_get_address(soc_dev, 0, NULL, NULL); 151 if (addrp == NULL) 152 return -1; 153 154 addr = of_translate_address(soc_dev, addrp); 155 if (addr == OF_BAD_ADDR) 156 return -1; 157 158 /* Add port, irq will be dealt with later. We passed a translated 159 * IO port value. It will be fixed up later along with the irq 160 */ 161 if (tsi && !strcmp(tsi->type, "tsi-bridge")) 162 return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); 163 else 164 return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); 165 } 166 167 static int __init add_legacy_isa_port(struct device_node *np, 168 struct device_node *isa_brg) 169 { 170 const u32 *reg; 171 const char *typep; 172 int index = -1; 173 u64 taddr; 174 175 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); 176 177 /* Get the ISA port number */ 178 reg = of_get_property(np, "reg", NULL); 179 if (reg == NULL) 180 return -1; 181 182 /* Verify it's an IO port, we don't support anything else */ 183 if (!(reg[0] & 0x00000001)) 184 return -1; 185 186 /* Now look for an "ibm,aix-loc" property that gives us ordering 187 * if any... 188 */ 189 typep = of_get_property(np, "ibm,aix-loc", NULL); 190 191 /* If we have a location index, then use it */ 192 if (typep && *typep == 'S') 193 index = simple_strtol(typep+1, NULL, 0) - 1; 194 195 /* Translate ISA address. If it fails, we still register the port 196 * with no translated address so that it can be picked up as an IO 197 * port later by the serial driver 198 */ 199 taddr = of_translate_address(np, reg); 200 if (taddr == OF_BAD_ADDR) 201 taddr = 0; 202 203 /* Add port, irq will be dealt with later */ 204 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, 205 NO_IRQ, UPF_BOOT_AUTOCONF, 0); 206 207 } 208 209 #ifdef CONFIG_PCI 210 static int __init add_legacy_pci_port(struct device_node *np, 211 struct device_node *pci_dev) 212 { 213 u64 addr, base; 214 const u32 *addrp; 215 unsigned int flags; 216 int iotype, index = -1, lindex = 0; 217 218 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); 219 220 /* We only support ports that have a clock frequency properly 221 * encoded in the device-tree (that is have an fcode). Anything 222 * else can't be used that early and will be normally probed by 223 * the generic 8250_pci driver later on. The reason is that 8250 224 * compatible UARTs on PCI need all sort of quirks (port offsets 225 * etc...) that this code doesn't know about 226 */ 227 if (of_get_property(np, "clock-frequency", NULL) == NULL) 228 return -1; 229 230 /* Get the PCI address. Assume BAR 0 */ 231 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); 232 if (addrp == NULL) 233 return -1; 234 235 /* We only support BAR 0 for now */ 236 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; 237 addr = of_translate_address(pci_dev, addrp); 238 if (addr == OF_BAD_ADDR) 239 return -1; 240 241 /* Set the IO base to the same as the translated address for MMIO, 242 * or to the domain local IO base for PIO (it will be fixed up later) 243 */ 244 if (iotype == UPIO_MEM) 245 base = addr; 246 else 247 base = addrp[2]; 248 249 /* Try to guess an index... If we have subdevices of the pci dev, 250 * we get to their "reg" property 251 */ 252 if (np != pci_dev) { 253 const u32 *reg = of_get_property(np, "reg", NULL); 254 if (reg && (*reg < 4)) 255 index = lindex = *reg; 256 } 257 258 /* Local index means it's the Nth port in the PCI chip. Unfortunately 259 * the offset to add here is device specific. We know about those 260 * EXAR ports and we default to the most common case. If your UART 261 * doesn't work for these settings, you'll have to add your own special 262 * cases here 263 */ 264 if (of_device_is_compatible(pci_dev, "pci13a8,152") || 265 of_device_is_compatible(pci_dev, "pci13a8,154") || 266 of_device_is_compatible(pci_dev, "pci13a8,158")) { 267 addr += 0x200 * lindex; 268 base += 0x200 * lindex; 269 } else { 270 addr += 8 * lindex; 271 base += 8 * lindex; 272 } 273 274 /* Add port, irq will be dealt with later. We passed a translated 275 * IO port value. It will be fixed up later along with the irq 276 */ 277 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, 278 UPF_BOOT_AUTOCONF, np != pci_dev); 279 } 280 #endif 281 282 static void __init setup_legacy_serial_console(int console) 283 { 284 struct legacy_serial_info *info = 285 &legacy_serial_infos[console]; 286 void __iomem *addr; 287 288 if (info->taddr == 0) 289 return; 290 addr = ioremap(info->taddr, 0x1000); 291 if (addr == NULL) 292 return; 293 if (info->speed == 0) 294 info->speed = udbg_probe_uart_speed(addr, info->clock); 295 DBG("default console speed = %d\n", info->speed); 296 udbg_init_uart(addr, info->speed, info->clock); 297 } 298 299 /* 300 * This is called very early, as part of setup_system() or eventually 301 * setup_arch(), basically before anything else in this file. This function 302 * will try to build a list of all the available 8250-compatible serial ports 303 * in the machine using the Open Firmware device-tree. It currently only deals 304 * with ISA and PCI busses but could be extended. It allows a very early boot 305 * console to be initialized, that list is also used later to provide 8250 with 306 * the machine non-PCI ports and to properly pick the default console port 307 */ 308 void __init find_legacy_serial_ports(void) 309 { 310 struct device_node *np, *stdout = NULL; 311 const char *path; 312 int index; 313 314 DBG(" -> find_legacy_serial_port()\n"); 315 316 /* Now find out if one of these is out firmware console */ 317 path = of_get_property(of_chosen, "linux,stdout-path", NULL); 318 if (path != NULL) { 319 stdout = of_find_node_by_path(path); 320 if (stdout) 321 DBG("stdout is %s\n", stdout->full_name); 322 } else { 323 DBG(" no linux,stdout-path !\n"); 324 } 325 326 /* Iterate over all the 16550 ports, looking for known parents */ 327 for_each_compatible_node(np, "serial", "ns16550") { 328 struct device_node *parent = of_get_parent(np); 329 if (!parent) 330 continue; 331 if (of_match_node(legacy_serial_parents, parent) != NULL) { 332 index = add_legacy_soc_port(np, np); 333 if (index >= 0 && np == stdout) 334 legacy_serial_console = index; 335 } 336 of_node_put(parent); 337 } 338 339 /* Next, fill our array with ISA ports */ 340 for_each_node_by_type(np, "serial") { 341 struct device_node *isa = of_get_parent(np); 342 if (isa && !strcmp(isa->name, "isa")) { 343 index = add_legacy_isa_port(np, isa); 344 if (index >= 0 && np == stdout) 345 legacy_serial_console = index; 346 } 347 of_node_put(isa); 348 } 349 350 #ifdef CONFIG_PCI 351 /* Next, try to locate PCI ports */ 352 for (np = NULL; (np = of_find_all_nodes(np));) { 353 struct device_node *pci, *parent = of_get_parent(np); 354 if (parent && !strcmp(parent->name, "isa")) { 355 of_node_put(parent); 356 continue; 357 } 358 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { 359 of_node_put(parent); 360 continue; 361 } 362 /* Check for known pciclass, and also check wether we have 363 * a device with child nodes for ports or not 364 */ 365 if (of_device_is_compatible(np, "pciclass,0700") || 366 of_device_is_compatible(np, "pciclass,070002")) 367 pci = np; 368 else if (of_device_is_compatible(parent, "pciclass,0700") || 369 of_device_is_compatible(parent, "pciclass,070002")) 370 pci = parent; 371 else { 372 of_node_put(parent); 373 continue; 374 } 375 index = add_legacy_pci_port(np, pci); 376 if (index >= 0 && np == stdout) 377 legacy_serial_console = index; 378 of_node_put(parent); 379 } 380 #endif 381 382 DBG("legacy_serial_console = %d\n", legacy_serial_console); 383 if (legacy_serial_console >= 0) 384 setup_legacy_serial_console(legacy_serial_console); 385 DBG(" <- find_legacy_serial_port()\n"); 386 } 387 388 static struct platform_device serial_device = { 389 .name = "serial8250", 390 .id = PLAT8250_DEV_PLATFORM, 391 .dev = { 392 .platform_data = legacy_serial_ports, 393 }, 394 }; 395 396 static void __init fixup_port_irq(int index, 397 struct device_node *np, 398 struct plat_serial8250_port *port) 399 { 400 unsigned int virq; 401 402 DBG("fixup_port_irq(%d)\n", index); 403 404 virq = irq_of_parse_and_map(np, 0); 405 if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { 406 np = of_get_parent(np); 407 if (np == NULL) 408 return; 409 virq = irq_of_parse_and_map(np, 0); 410 of_node_put(np); 411 } 412 if (virq == NO_IRQ) 413 return; 414 415 port->irq = virq; 416 } 417 418 static void __init fixup_port_pio(int index, 419 struct device_node *np, 420 struct plat_serial8250_port *port) 421 { 422 #ifdef CONFIG_PCI 423 struct pci_controller *hose; 424 425 DBG("fixup_port_pio(%d)\n", index); 426 427 hose = pci_find_hose_for_OF_device(np); 428 if (hose) { 429 unsigned long offset = (unsigned long)hose->io_base_virt - 430 #ifdef CONFIG_PPC64 431 pci_io_base; 432 #else 433 isa_io_base; 434 #endif 435 DBG("port %d, IO %lx -> %lx\n", 436 index, port->iobase, port->iobase + offset); 437 port->iobase += offset; 438 } 439 #endif 440 } 441 442 static void __init fixup_port_mmio(int index, 443 struct device_node *np, 444 struct plat_serial8250_port *port) 445 { 446 DBG("fixup_port_mmio(%d)\n", index); 447 448 port->membase = ioremap(port->mapbase, 0x100); 449 } 450 451 /* 452 * This is called as an arch initcall, hopefully before the PCI bus is 453 * probed and/or the 8250 driver loaded since we need to register our 454 * platform devices before 8250 PCI ones are detected as some of them 455 * must properly "override" the platform ones. 456 * 457 * This function fixes up the interrupt value for platform ports as it 458 * couldn't be done earlier before interrupt maps have been parsed. It 459 * also "corrects" the IO address for PIO ports for the same reason, 460 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then 461 * registers all those platform ports for use by the 8250 driver when it 462 * finally loads. 463 */ 464 static int __init serial_dev_init(void) 465 { 466 int i; 467 468 if (legacy_serial_count == 0) 469 return -ENODEV; 470 471 /* 472 * Before we register the platfrom serial devices, we need 473 * to fixup their interrupts and their IO ports. 474 */ 475 DBG("Fixing serial ports interrupts and IO ports ...\n"); 476 477 for (i = 0; i < legacy_serial_count; i++) { 478 struct plat_serial8250_port *port = &legacy_serial_ports[i]; 479 struct device_node *np = legacy_serial_infos[i].np; 480 481 if (port->irq == NO_IRQ) 482 fixup_port_irq(i, np, port); 483 if (port->iotype == UPIO_PORT) 484 fixup_port_pio(i, np, port); 485 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) 486 fixup_port_mmio(i, np, port); 487 } 488 489 DBG("Registering platform serial ports\n"); 490 491 return platform_device_register(&serial_device); 492 } 493 device_initcall(serial_dev_init); 494 495 496 #ifdef CONFIG_SERIAL_8250_CONSOLE 497 /* 498 * This is called very early, as part of console_init() (typically just after 499 * time_init()). This function is respondible for trying to find a good 500 * default console on serial ports. It tries to match the open firmware 501 * default output with one of the available serial console drivers that have 502 * been probed earlier by find_legacy_serial_ports() 503 */ 504 static int __init check_legacy_serial_console(void) 505 { 506 struct device_node *prom_stdout = NULL; 507 int i, speed = 0, offset = 0; 508 const char *name; 509 const u32 *spd; 510 511 DBG(" -> check_legacy_serial_console()\n"); 512 513 /* The user has requested a console so this is already set up. */ 514 if (strstr(boot_command_line, "console=")) { 515 DBG(" console was specified !\n"); 516 return -EBUSY; 517 } 518 519 if (!of_chosen) { 520 DBG(" of_chosen is NULL !\n"); 521 return -ENODEV; 522 } 523 524 if (legacy_serial_console < 0) { 525 DBG(" legacy_serial_console not found !\n"); 526 return -ENODEV; 527 } 528 /* We are getting a weird phandle from OF ... */ 529 /* ... So use the full path instead */ 530 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 531 if (name == NULL) { 532 DBG(" no linux,stdout-path !\n"); 533 return -ENODEV; 534 } 535 prom_stdout = of_find_node_by_path(name); 536 if (!prom_stdout) { 537 DBG(" can't find stdout package %s !\n", name); 538 return -ENODEV; 539 } 540 DBG("stdout is %s\n", prom_stdout->full_name); 541 542 name = of_get_property(prom_stdout, "name", NULL); 543 if (!name) { 544 DBG(" stdout package has no name !\n"); 545 goto not_found; 546 } 547 spd = of_get_property(prom_stdout, "current-speed", NULL); 548 if (spd) 549 speed = *spd; 550 551 if (strcmp(name, "serial") != 0) 552 goto not_found; 553 554 /* Look for it in probed array */ 555 for (i = 0; i < legacy_serial_count; i++) { 556 if (prom_stdout != legacy_serial_infos[i].np) 557 continue; 558 offset = i; 559 speed = legacy_serial_infos[i].speed; 560 break; 561 } 562 if (i >= legacy_serial_count) 563 goto not_found; 564 565 of_node_put(prom_stdout); 566 567 DBG("Found serial console at ttyS%d\n", offset); 568 569 if (speed) { 570 static char __initdata opt[16]; 571 sprintf(opt, "%d", speed); 572 return add_preferred_console("ttyS", offset, opt); 573 } else 574 return add_preferred_console("ttyS", offset, NULL); 575 576 not_found: 577 DBG("No preferred console found !\n"); 578 of_node_put(prom_stdout); 579 return -ENODEV; 580 } 581 console_initcall(check_legacy_serial_console); 582 583 #endif /* CONFIG_SERIAL_8250_CONSOLE */ 584