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