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 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 static unsigned int legacy_serial_count; 46 static int legacy_serial_console = -1; 47 48 static int __init add_legacy_port(struct device_node *np, int want_index, 49 int iotype, phys_addr_t base, 50 phys_addr_t taddr, unsigned long irq, 51 upf_t flags, int irq_check_parent) 52 { 53 const u32 *clk, *spd; 54 u32 clock = BASE_BAUD * 16; 55 int index; 56 57 /* get clock freq. if present */ 58 clk = of_get_property(np, "clock-frequency", NULL); 59 if (clk && *clk) 60 clock = *clk; 61 62 /* get default speed if present */ 63 spd = of_get_property(np, "current-speed", NULL); 64 65 /* If we have a location index, then try to use it */ 66 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) 67 index = want_index; 68 else 69 index = legacy_serial_count; 70 71 /* if our index is still out of range, that mean that 72 * array is full, we could scan for a free slot but that 73 * make little sense to bother, just skip the port 74 */ 75 if (index >= MAX_LEGACY_SERIAL_PORTS) 76 return -1; 77 if (index >= legacy_serial_count) 78 legacy_serial_count = index + 1; 79 80 /* Check if there is a port who already claimed our slot */ 81 if (legacy_serial_infos[index].np != 0) { 82 /* if we still have some room, move it, else override */ 83 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { 84 printk(KERN_DEBUG "Moved legacy port %d -> %d\n", 85 index, legacy_serial_count); 86 legacy_serial_ports[legacy_serial_count] = 87 legacy_serial_ports[index]; 88 legacy_serial_infos[legacy_serial_count] = 89 legacy_serial_infos[index]; 90 legacy_serial_count++; 91 } else { 92 printk(KERN_DEBUG "Replacing legacy port %d\n", index); 93 } 94 } 95 96 /* Now fill the entry */ 97 memset(&legacy_serial_ports[index], 0, 98 sizeof(struct plat_serial8250_port)); 99 if (iotype == UPIO_PORT) 100 legacy_serial_ports[index].iobase = base; 101 else 102 legacy_serial_ports[index].mapbase = base; 103 legacy_serial_ports[index].iotype = iotype; 104 legacy_serial_ports[index].uartclk = clock; 105 legacy_serial_ports[index].irq = irq; 106 legacy_serial_ports[index].flags = flags; 107 legacy_serial_infos[index].taddr = taddr; 108 legacy_serial_infos[index].np = of_node_get(np); 109 legacy_serial_infos[index].clock = clock; 110 legacy_serial_infos[index].speed = spd ? *spd : 0; 111 legacy_serial_infos[index].irq_check_parent = irq_check_parent; 112 113 printk(KERN_DEBUG "Found legacy serial port %d for %s\n", 114 index, np->full_name); 115 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", 116 (iotype == UPIO_PORT) ? "port" : "mem", 117 (unsigned long long)base, (unsigned long long)taddr, irq, 118 legacy_serial_ports[index].uartclk, 119 legacy_serial_infos[index].speed); 120 121 return index; 122 } 123 124 static int __init add_legacy_soc_port(struct device_node *np, 125 struct device_node *soc_dev) 126 { 127 u64 addr; 128 const u32 *addrp; 129 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ 130 | UPF_FIXED_PORT; 131 struct device_node *tsi = of_get_parent(np); 132 133 /* We only support ports that have a clock frequency properly 134 * encoded in the device-tree. 135 */ 136 if (of_get_property(np, "clock-frequency", NULL) == NULL) 137 return -1; 138 139 /* if rtas uses this device, don't try to use it as well */ 140 if (of_get_property(np, "used-by-rtas", NULL) != NULL) 141 return -1; 142 143 /* Get the address */ 144 addrp = of_get_address(soc_dev, 0, NULL, NULL); 145 if (addrp == NULL) 146 return -1; 147 148 addr = of_translate_address(soc_dev, addrp); 149 if (addr == OF_BAD_ADDR) 150 return -1; 151 152 /* Add port, irq will be dealt with later. We passed a translated 153 * IO port value. It will be fixed up later along with the irq 154 */ 155 if (tsi && !strcmp(tsi->type, "tsi-bridge")) 156 return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); 157 else 158 return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); 159 } 160 161 static int __init add_legacy_isa_port(struct device_node *np, 162 struct device_node *isa_brg) 163 { 164 const u32 *reg; 165 const char *typep; 166 int index = -1; 167 u64 taddr; 168 169 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); 170 171 /* Get the ISA port number */ 172 reg = of_get_property(np, "reg", NULL); 173 if (reg == NULL) 174 return -1; 175 176 /* Verify it's an IO port, we don't support anything else */ 177 if (!(reg[0] & 0x00000001)) 178 return -1; 179 180 /* Now look for an "ibm,aix-loc" property that gives us ordering 181 * if any... 182 */ 183 typep = of_get_property(np, "ibm,aix-loc", NULL); 184 185 /* If we have a location index, then use it */ 186 if (typep && *typep == 'S') 187 index = simple_strtol(typep+1, NULL, 0) - 1; 188 189 /* Translate ISA address. If it fails, we still register the port 190 * with no translated address so that it can be picked up as an IO 191 * port later by the serial driver 192 */ 193 taddr = of_translate_address(np, reg); 194 if (taddr == OF_BAD_ADDR) 195 taddr = 0; 196 197 /* Add port, irq will be dealt with later */ 198 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, 199 NO_IRQ, UPF_BOOT_AUTOCONF, 0); 200 201 } 202 203 #ifdef CONFIG_PCI 204 static int __init add_legacy_pci_port(struct device_node *np, 205 struct device_node *pci_dev) 206 { 207 u64 addr, base; 208 const u32 *addrp; 209 unsigned int flags; 210 int iotype, index = -1, lindex = 0; 211 212 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); 213 214 /* We only support ports that have a clock frequency properly 215 * encoded in the device-tree (that is have an fcode). Anything 216 * else can't be used that early and will be normally probed by 217 * the generic 8250_pci driver later on. The reason is that 8250 218 * compatible UARTs on PCI need all sort of quirks (port offsets 219 * etc...) that this code doesn't know about 220 */ 221 if (of_get_property(np, "clock-frequency", NULL) == NULL) 222 return -1; 223 224 /* Get the PCI address. Assume BAR 0 */ 225 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); 226 if (addrp == NULL) 227 return -1; 228 229 /* We only support BAR 0 for now */ 230 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; 231 addr = of_translate_address(pci_dev, addrp); 232 if (addr == OF_BAD_ADDR) 233 return -1; 234 235 /* Set the IO base to the same as the translated address for MMIO, 236 * or to the domain local IO base for PIO (it will be fixed up later) 237 */ 238 if (iotype == UPIO_MEM) 239 base = addr; 240 else 241 base = addrp[2]; 242 243 /* Try to guess an index... If we have subdevices of the pci dev, 244 * we get to their "reg" property 245 */ 246 if (np != pci_dev) { 247 const u32 *reg = of_get_property(np, "reg", NULL); 248 if (reg && (*reg < 4)) 249 index = lindex = *reg; 250 } 251 252 /* Local index means it's the Nth port in the PCI chip. Unfortunately 253 * the offset to add here is device specific. We know about those 254 * EXAR ports and we default to the most common case. If your UART 255 * doesn't work for these settings, you'll have to add your own special 256 * cases here 257 */ 258 if (of_device_is_compatible(pci_dev, "pci13a8,152") || 259 of_device_is_compatible(pci_dev, "pci13a8,154") || 260 of_device_is_compatible(pci_dev, "pci13a8,158")) { 261 addr += 0x200 * lindex; 262 base += 0x200 * lindex; 263 } else { 264 addr += 8 * lindex; 265 base += 8 * lindex; 266 } 267 268 /* Add port, irq will be dealt with later. We passed a translated 269 * IO port value. It will be fixed up later along with the irq 270 */ 271 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, 272 UPF_BOOT_AUTOCONF, np != pci_dev); 273 } 274 #endif 275 276 static void __init setup_legacy_serial_console(int console) 277 { 278 struct legacy_serial_info *info = 279 &legacy_serial_infos[console]; 280 void __iomem *addr; 281 282 if (info->taddr == 0) 283 return; 284 addr = ioremap(info->taddr, 0x1000); 285 if (addr == NULL) 286 return; 287 if (info->speed == 0) 288 info->speed = udbg_probe_uart_speed(addr, info->clock); 289 DBG("default console speed = %d\n", info->speed); 290 udbg_init_uart(addr, info->speed, info->clock); 291 } 292 293 /* 294 * This is called very early, as part of setup_system() or eventually 295 * setup_arch(), basically before anything else in this file. This function 296 * will try to build a list of all the available 8250-compatible serial ports 297 * in the machine using the Open Firmware device-tree. It currently only deals 298 * with ISA and PCI busses but could be extended. It allows a very early boot 299 * console to be initialized, that list is also used later to provide 8250 with 300 * the machine non-PCI ports and to properly pick the default console port 301 */ 302 void __init find_legacy_serial_ports(void) 303 { 304 struct device_node *np, *stdout = NULL; 305 const char *path; 306 int index; 307 308 DBG(" -> find_legacy_serial_port()\n"); 309 310 /* Now find out if one of these is out firmware console */ 311 path = of_get_property(of_chosen, "linux,stdout-path", NULL); 312 if (path != NULL) { 313 stdout = of_find_node_by_path(path); 314 if (stdout) 315 DBG("stdout is %s\n", stdout->full_name); 316 } else { 317 DBG(" no linux,stdout-path !\n"); 318 } 319 320 /* Iterate over all the 16550 ports, looking for known parents */ 321 for_each_compatible_node(np, "serial", "ns16550") { 322 struct device_node *parent = of_get_parent(np); 323 if (!parent) 324 continue; 325 if (of_match_node(parents, parent) != NULL) { 326 index = add_legacy_soc_port(np, np); 327 if (index >= 0 && np == stdout) 328 legacy_serial_console = index; 329 } 330 of_node_put(parent); 331 } 332 333 /* Next, fill our array with ISA ports */ 334 for_each_node_by_type(np, "serial") { 335 struct device_node *isa = of_get_parent(np); 336 if (isa && !strcmp(isa->name, "isa")) { 337 index = add_legacy_isa_port(np, isa); 338 if (index >= 0 && np == stdout) 339 legacy_serial_console = index; 340 } 341 of_node_put(isa); 342 } 343 344 #ifdef CONFIG_PCI 345 /* Next, try to locate PCI ports */ 346 for (np = NULL; (np = of_find_all_nodes(np));) { 347 struct device_node *pci, *parent = of_get_parent(np); 348 if (parent && !strcmp(parent->name, "isa")) { 349 of_node_put(parent); 350 continue; 351 } 352 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { 353 of_node_put(parent); 354 continue; 355 } 356 /* Check for known pciclass, and also check wether we have 357 * a device with child nodes for ports or not 358 */ 359 if (of_device_is_compatible(np, "pciclass,0700") || 360 of_device_is_compatible(np, "pciclass,070002")) 361 pci = np; 362 else if (of_device_is_compatible(parent, "pciclass,0700") || 363 of_device_is_compatible(parent, "pciclass,070002")) 364 pci = parent; 365 else { 366 of_node_put(parent); 367 continue; 368 } 369 index = add_legacy_pci_port(np, pci); 370 if (index >= 0 && np == stdout) 371 legacy_serial_console = index; 372 of_node_put(parent); 373 } 374 #endif 375 376 DBG("legacy_serial_console = %d\n", legacy_serial_console); 377 if (legacy_serial_console >= 0) 378 setup_legacy_serial_console(legacy_serial_console); 379 DBG(" <- find_legacy_serial_port()\n"); 380 } 381 382 static struct platform_device serial_device = { 383 .name = "serial8250", 384 .id = PLAT8250_DEV_PLATFORM, 385 .dev = { 386 .platform_data = legacy_serial_ports, 387 }, 388 }; 389 390 static void __init fixup_port_irq(int index, 391 struct device_node *np, 392 struct plat_serial8250_port *port) 393 { 394 unsigned int virq; 395 396 DBG("fixup_port_irq(%d)\n", index); 397 398 virq = irq_of_parse_and_map(np, 0); 399 if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { 400 np = of_get_parent(np); 401 if (np == NULL) 402 return; 403 virq = irq_of_parse_and_map(np, 0); 404 of_node_put(np); 405 } 406 if (virq == NO_IRQ) 407 return; 408 409 port->irq = virq; 410 } 411 412 static void __init fixup_port_pio(int index, 413 struct device_node *np, 414 struct plat_serial8250_port *port) 415 { 416 #ifdef CONFIG_PCI 417 struct pci_controller *hose; 418 419 DBG("fixup_port_pio(%d)\n", index); 420 421 hose = pci_find_hose_for_OF_device(np); 422 if (hose) { 423 unsigned long offset = (unsigned long)hose->io_base_virt - 424 #ifdef CONFIG_PPC64 425 pci_io_base; 426 #else 427 isa_io_base; 428 #endif 429 DBG("port %d, IO %lx -> %lx\n", 430 index, port->iobase, port->iobase + offset); 431 port->iobase += offset; 432 } 433 #endif 434 } 435 436 static void __init fixup_port_mmio(int index, 437 struct device_node *np, 438 struct plat_serial8250_port *port) 439 { 440 DBG("fixup_port_mmio(%d)\n", index); 441 442 port->membase = ioremap(port->mapbase, 0x100); 443 } 444 445 /* 446 * This is called as an arch initcall, hopefully before the PCI bus is 447 * probed and/or the 8250 driver loaded since we need to register our 448 * platform devices before 8250 PCI ones are detected as some of them 449 * must properly "override" the platform ones. 450 * 451 * This function fixes up the interrupt value for platform ports as it 452 * couldn't be done earlier before interrupt maps have been parsed. It 453 * also "corrects" the IO address for PIO ports for the same reason, 454 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then 455 * registers all those platform ports for use by the 8250 driver when it 456 * finally loads. 457 */ 458 static int __init serial_dev_init(void) 459 { 460 int i; 461 462 if (legacy_serial_count == 0) 463 return -ENODEV; 464 465 /* 466 * Before we register the platfrom serial devices, we need 467 * to fixup their interrupts and their IO ports. 468 */ 469 DBG("Fixing serial ports interrupts and IO ports ...\n"); 470 471 for (i = 0; i < legacy_serial_count; i++) { 472 struct plat_serial8250_port *port = &legacy_serial_ports[i]; 473 struct device_node *np = legacy_serial_infos[i].np; 474 475 if (port->irq == NO_IRQ) 476 fixup_port_irq(i, np, port); 477 if (port->iotype == UPIO_PORT) 478 fixup_port_pio(i, np, port); 479 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) 480 fixup_port_mmio(i, np, port); 481 } 482 483 DBG("Registering platform serial ports\n"); 484 485 return platform_device_register(&serial_device); 486 } 487 device_initcall(serial_dev_init); 488 489 490 /* 491 * This is called very early, as part of console_init() (typically just after 492 * time_init()). This function is respondible for trying to find a good 493 * default console on serial ports. It tries to match the open firmware 494 * default output with one of the available serial console drivers, either 495 * one of the platform serial ports that have been probed earlier by 496 * find_legacy_serial_ports() or some more platform specific ones. 497 */ 498 static int __init check_legacy_serial_console(void) 499 { 500 struct device_node *prom_stdout = NULL; 501 int speed = 0, offset = 0; 502 const char *name; 503 const u32 *spd; 504 505 DBG(" -> check_legacy_serial_console()\n"); 506 507 /* The user has requested a console so this is already set up. */ 508 if (strstr(boot_command_line, "console=")) { 509 DBG(" console was specified !\n"); 510 return -EBUSY; 511 } 512 513 if (!of_chosen) { 514 DBG(" of_chosen is NULL !\n"); 515 return -ENODEV; 516 } 517 518 if (legacy_serial_console < 0) { 519 DBG(" legacy_serial_console not found !\n"); 520 return -ENODEV; 521 } 522 /* We are getting a weird phandle from OF ... */ 523 /* ... So use the full path instead */ 524 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 525 if (name == NULL) { 526 DBG(" no linux,stdout-path !\n"); 527 return -ENODEV; 528 } 529 prom_stdout = of_find_node_by_path(name); 530 if (!prom_stdout) { 531 DBG(" can't find stdout package %s !\n", name); 532 return -ENODEV; 533 } 534 DBG("stdout is %s\n", prom_stdout->full_name); 535 536 name = of_get_property(prom_stdout, "name", NULL); 537 if (!name) { 538 DBG(" stdout package has no name !\n"); 539 goto not_found; 540 } 541 spd = of_get_property(prom_stdout, "current-speed", NULL); 542 if (spd) 543 speed = *spd; 544 545 if (0) 546 ; 547 #ifdef CONFIG_SERIAL_8250_CONSOLE 548 else if (strcmp(name, "serial") == 0) { 549 int i; 550 /* Look for it in probed array */ 551 for (i = 0; i < legacy_serial_count; i++) { 552 if (prom_stdout != legacy_serial_infos[i].np) 553 continue; 554 offset = i; 555 speed = legacy_serial_infos[i].speed; 556 break; 557 } 558 if (i >= legacy_serial_count) 559 goto not_found; 560 } 561 #endif /* CONFIG_SERIAL_8250_CONSOLE */ 562 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE 563 else if (strcmp(name, "ch-a") == 0) 564 offset = 0; 565 else if (strcmp(name, "ch-b") == 0) 566 offset = 1; 567 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ 568 else 569 goto not_found; 570 of_node_put(prom_stdout); 571 572 DBG("Found serial console at ttyS%d\n", offset); 573 574 if (speed) { 575 static char __initdata opt[16]; 576 sprintf(opt, "%d", speed); 577 return add_preferred_console("ttyS", offset, opt); 578 } else 579 return add_preferred_console("ttyS", offset, NULL); 580 581 not_found: 582 DBG("No preferred console found !\n"); 583 of_node_put(prom_stdout); 584 return -ENODEV; 585 } 586 console_initcall(check_legacy_serial_console); 587 588