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