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_address.h> 8#include <linux/of_device.h> 9#include <asm/io.h> 10#include <asm/mmu.h> 11#include <asm/prom.h> 12#include <asm/serial.h> 13#include <asm/udbg.h> 14#include <asm/pci-bridge.h> 15#include <asm/ppc-pci.h> 16 17#undef DEBUG 18 19#ifdef DEBUG 20#define DBG(fmt...) do { printk(fmt); } while(0) 21#else 22#define DBG(fmt...) do { } while(0) 23#endif 24 25#define MAX_LEGACY_SERIAL_PORTS 8 26 27static struct plat_serial8250_port 28legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; 29static struct legacy_serial_info { 30 struct device_node *np; 31 unsigned int speed; 32 unsigned int clock; 33 int irq_check_parent; 34 phys_addr_t taddr; 35} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; 36 37static struct __initdata of_device_id legacy_serial_parents[] = { 38 {.type = "soc",}, 39 {.type = "tsi-bridge",}, 40 {.type = "opb", }, 41 {.compatible = "ibm,opb",}, 42 {.compatible = "simple-bus",}, 43 {.compatible = "wrs,epld-localbus",}, 44 {}, 45}; 46 47static unsigned int legacy_serial_count; 48static int legacy_serial_console = -1; 49 50static int __init add_legacy_port(struct device_node *np, int want_index, 51 int iotype, phys_addr_t base, 52 phys_addr_t taddr, unsigned long irq, 53 upf_t flags, int irq_check_parent) 54{ 55 const u32 *clk, *spd; 56 u32 clock = BASE_BAUD * 16; 57 int index; 58 59 /* get clock freq. if present */ 60 clk = of_get_property(np, "clock-frequency", NULL); 61 if (clk && *clk) 62 clock = *clk; 63 64 /* get default speed if present */ 65 spd = of_get_property(np, "current-speed", NULL); 66 67 /* If we have a location index, then try to use it */ 68 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) 69 index = want_index; 70 else 71 index = legacy_serial_count; 72 73 /* if our index is still out of range, that mean that 74 * array is full, we could scan for a free slot but that 75 * make little sense to bother, just skip the port 76 */ 77 if (index >= MAX_LEGACY_SERIAL_PORTS) 78 return -1; 79 if (index >= legacy_serial_count) 80 legacy_serial_count = index + 1; 81 82 /* Check if there is a port who already claimed our slot */ 83 if (legacy_serial_infos[index].np != 0) { 84 /* if we still have some room, move it, else override */ 85 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { 86 printk(KERN_DEBUG "Moved legacy port %d -> %d\n", 87 index, legacy_serial_count); 88 legacy_serial_ports[legacy_serial_count] = 89 legacy_serial_ports[index]; 90 legacy_serial_infos[legacy_serial_count] = 91 legacy_serial_infos[index]; 92 legacy_serial_count++; 93 } else { 94 printk(KERN_DEBUG "Replacing legacy port %d\n", index); 95 } 96 } 97 98 /* Now fill the entry */ 99 memset(&legacy_serial_ports[index], 0, 100 sizeof(struct plat_serial8250_port)); 101 if (iotype == UPIO_PORT) 102 legacy_serial_ports[index].iobase = base; 103 else 104 legacy_serial_ports[index].mapbase = base; 105 legacy_serial_ports[index].iotype = iotype; 106 legacy_serial_ports[index].uartclk = clock; 107 legacy_serial_ports[index].irq = irq; 108 legacy_serial_ports[index].flags = flags; 109 legacy_serial_infos[index].taddr = taddr; 110 legacy_serial_infos[index].np = of_node_get(np); 111 legacy_serial_infos[index].clock = clock; 112 legacy_serial_infos[index].speed = spd ? *spd : 0; 113 legacy_serial_infos[index].irq_check_parent = irq_check_parent; 114 115 printk(KERN_DEBUG "Found legacy serial port %d for %s\n", 116 index, np->full_name); 117 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", 118 (iotype == UPIO_PORT) ? "port" : "mem", 119 (unsigned long long)base, (unsigned long long)taddr, irq, 120 legacy_serial_ports[index].uartclk, 121 legacy_serial_infos[index].speed); 122 123 return index; 124} 125 126static int __init add_legacy_soc_port(struct device_node *np, 127 struct device_node *soc_dev) 128{ 129 u64 addr; 130 const u32 *addrp; 131 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ 132 | UPF_FIXED_PORT; 133 struct device_node *tsi = of_get_parent(np); 134 135 /* We only support ports that have a clock frequency properly 136 * encoded in the device-tree. 137 */ 138 if (of_get_property(np, "clock-frequency", NULL) == NULL) 139 return -1; 140 141 /* if reg-shift or offset, don't try to use it */ 142 if ((of_get_property(np, "reg-shift", NULL) != NULL) || 143 (of_get_property(np, "reg-offset", NULL) != NULL)) 144 return -1; 145 146 /* if rtas uses this device, don't try to use it as well */ 147 if (of_get_property(np, "used-by-rtas", NULL) != NULL) 148 return -1; 149 150 /* Get the address */ 151 addrp = of_get_address(soc_dev, 0, NULL, NULL); 152 if (addrp == NULL) 153 return -1; 154 155 addr = of_translate_address(soc_dev, addrp); 156 if (addr == OF_BAD_ADDR) 157 return -1; 158 159 /* Add port, irq will be dealt with later. We passed a translated 160 * IO port value. It will be fixed up later along with the irq 161 */ 162 if (tsi && !strcmp(tsi->type, "tsi-bridge")) 163 return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); 164 else 165 return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); 166} 167 168static int __init add_legacy_isa_port(struct device_node *np, 169 struct device_node *isa_brg) 170{ 171 const u32 *reg; 172 const char *typep; 173 int index = -1; 174 u64 taddr; 175 176 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); 177 178 /* Get the ISA port number */ 179 reg = of_get_property(np, "reg", NULL); 180 if (reg == NULL) 181 return -1; 182 183 /* Verify it's an IO port, we don't support anything else */ 184 if (!(reg[0] & 0x00000001)) 185 return -1; 186 187 /* Now look for an "ibm,aix-loc" property that gives us ordering 188 * if any... 189 */ 190 typep = of_get_property(np, "ibm,aix-loc", NULL); 191 192 /* If we have a location index, then use it */ 193 if (typep && *typep == 'S') 194 index = simple_strtol(typep+1, NULL, 0) - 1; 195 196 /* Translate ISA address. If it fails, we still register the port 197 * with no translated address so that it can be picked up as an IO 198 * port later by the serial driver 199 */ 200 taddr = of_translate_address(np, reg); 201 if (taddr == OF_BAD_ADDR) 202 taddr = 0; 203 204 /* Add port, irq will be dealt with later */ 205 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, 206 NO_IRQ, UPF_BOOT_AUTOCONF, 0); 207 208} 209 210#ifdef CONFIG_PCI 211static int __init add_legacy_pci_port(struct device_node *np, 212 struct device_node *pci_dev) 213{ 214 u64 addr, base; 215 const u32 *addrp; 216 unsigned int flags; 217 int iotype, index = -1, lindex = 0; 218 219 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); 220 221 /* We only support ports that have a clock frequency properly 222 * encoded in the device-tree (that is have an fcode). Anything 223 * else can't be used that early and will be normally probed by 224 * the generic 8250_pci driver later on. The reason is that 8250 225 * compatible UARTs on PCI need all sort of quirks (port offsets 226 * etc...) that this code doesn't know about 227 */ 228 if (of_get_property(np, "clock-frequency", NULL) == NULL) 229 return -1; 230 231 /* Get the PCI address. Assume BAR 0 */ 232 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); 233 if (addrp == NULL) 234 return -1; 235 236 /* We only support BAR 0 for now */ 237 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; 238 addr = of_translate_address(pci_dev, addrp); 239 if (addr == OF_BAD_ADDR) 240 return -1; 241 242 /* Set the IO base to the same as the translated address for MMIO, 243 * or to the domain local IO base for PIO (it will be fixed up later) 244 */ 245 if (iotype == UPIO_MEM) 246 base = addr; 247 else 248 base = addrp[2]; 249 250 /* Try to guess an index... If we have subdevices of the pci dev, 251 * we get to their "reg" property 252 */ 253 if (np != pci_dev) { 254 const u32 *reg = of_get_property(np, "reg", NULL); 255 if (reg && (*reg < 4)) 256 index = lindex = *reg; 257 } 258 259 /* Local index means it's the Nth port in the PCI chip. Unfortunately 260 * the offset to add here is device specific. We know about those 261 * EXAR ports and we default to the most common case. If your UART 262 * doesn't work for these settings, you'll have to add your own special 263 * cases here 264 */ 265 if (of_device_is_compatible(pci_dev, "pci13a8,152") || 266 of_device_is_compatible(pci_dev, "pci13a8,154") || 267 of_device_is_compatible(pci_dev, "pci13a8,158")) { 268 addr += 0x200 * lindex; 269 base += 0x200 * lindex; 270 } else { 271 addr += 8 * lindex; 272 base += 8 * lindex; 273 } 274 275 /* Add port, irq will be dealt with later. We passed a translated 276 * IO port value. It will be fixed up later along with the irq 277 */ 278 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, 279 UPF_BOOT_AUTOCONF, np != pci_dev); 280} 281#endif 282 283static void __init setup_legacy_serial_console(int console) 284{ 285 struct legacy_serial_info *info = 286 &legacy_serial_infos[console]; 287 void __iomem *addr; 288 289 if (info->taddr == 0) 290 return; 291 addr = ioremap(info->taddr, 0x1000); 292 if (addr == NULL) 293 return; 294 if (info->speed == 0) 295 info->speed = udbg_probe_uart_speed(addr, info->clock); 296 DBG("default console speed = %d\n", info->speed); 297 udbg_init_uart(addr, info->speed, info->clock); 298} 299 300/* 301 * This is called very early, as part of setup_system() or eventually 302 * setup_arch(), basically before anything else in this file. This function 303 * will try to build a list of all the available 8250-compatible serial ports 304 * in the machine using the Open Firmware device-tree. It currently only deals 305 * with ISA and PCI busses but could be extended. It allows a very early boot 306 * console to be initialized, that list is also used later to provide 8250 with 307 * the machine non-PCI ports and to properly pick the default console port 308 */ 309void __init find_legacy_serial_ports(void) 310{ 311 struct device_node *np, *stdout = NULL; 312 const char *path; 313 int index; 314 315 DBG(" -> find_legacy_serial_port()\n"); 316 317 /* Now find out if one of these is out firmware console */ 318 path = of_get_property(of_chosen, "linux,stdout-path", NULL); 319 if (path != NULL) { 320 stdout = of_find_node_by_path(path); 321 if (stdout) 322 DBG("stdout is %s\n", stdout->full_name); 323 } else { 324 DBG(" no linux,stdout-path !\n"); 325 } 326 327 /* Iterate over all the 16550 ports, looking for known parents */ 328 for_each_compatible_node(np, "serial", "ns16550") { 329 struct device_node *parent = of_get_parent(np); 330 if (!parent) 331 continue; 332 if (of_match_node(legacy_serial_parents, parent) != NULL) { 333 index = add_legacy_soc_port(np, np); 334 if (index >= 0 && np == stdout) 335 legacy_serial_console = index; 336 } 337 of_node_put(parent); 338 } 339 340 /* Next, fill our array with ISA ports */ 341 for_each_node_by_type(np, "serial") { 342 struct device_node *isa = of_get_parent(np); 343 if (isa && !strcmp(isa->name, "isa")) { 344 index = add_legacy_isa_port(np, isa); 345 if (index >= 0 && np == stdout) 346 legacy_serial_console = index; 347 } 348 of_node_put(isa); 349 } 350 351#ifdef CONFIG_PCI 352 /* Next, try to locate PCI ports */ 353 for (np = NULL; (np = of_find_all_nodes(np));) { 354 struct device_node *pci, *parent = of_get_parent(np); 355 if (parent && !strcmp(parent->name, "isa")) { 356 of_node_put(parent); 357 continue; 358 } 359 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { 360 of_node_put(parent); 361 continue; 362 } 363 /* Check for known pciclass, and also check wether we have 364 * a device with child nodes for ports or not 365 */ 366 if (of_device_is_compatible(np, "pciclass,0700") || 367 of_device_is_compatible(np, "pciclass,070002")) 368 pci = np; 369 else if (of_device_is_compatible(parent, "pciclass,0700") || 370 of_device_is_compatible(parent, "pciclass,070002")) 371 pci = parent; 372 else { 373 of_node_put(parent); 374 continue; 375 } 376 index = add_legacy_pci_port(np, pci); 377 if (index >= 0 && np == stdout) 378 legacy_serial_console = index; 379 of_node_put(parent); 380 } 381#endif 382 383 DBG("legacy_serial_console = %d\n", legacy_serial_console); 384 if (legacy_serial_console >= 0) 385 setup_legacy_serial_console(legacy_serial_console); 386 DBG(" <- find_legacy_serial_port()\n"); 387} 388 389static struct platform_device serial_device = { 390 .name = "serial8250", 391 .id = PLAT8250_DEV_PLATFORM, 392 .dev = { 393 .platform_data = legacy_serial_ports, 394 }, 395}; 396 397static void __init fixup_port_irq(int index, 398 struct device_node *np, 399 struct plat_serial8250_port *port) 400{ 401 unsigned int virq; 402 403 DBG("fixup_port_irq(%d)\n", index); 404 405 virq = irq_of_parse_and_map(np, 0); 406 if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { 407 np = of_get_parent(np); 408 if (np == NULL) 409 return; 410 virq = irq_of_parse_and_map(np, 0); 411 of_node_put(np); 412 } 413 if (virq == NO_IRQ) 414 return; 415 416 port->irq = virq; 417} 418 419static void __init fixup_port_pio(int index, 420 struct device_node *np, 421 struct plat_serial8250_port *port) 422{ 423#ifdef CONFIG_PCI 424 struct pci_controller *hose; 425 426 DBG("fixup_port_pio(%d)\n", index); 427 428 hose = pci_find_hose_for_OF_device(np); 429 if (hose) { 430 unsigned long offset = (unsigned long)hose->io_base_virt - 431#ifdef CONFIG_PPC64 432 pci_io_base; 433#else 434 isa_io_base; 435#endif 436 DBG("port %d, IO %lx -> %lx\n", 437 index, port->iobase, port->iobase + offset); 438 port->iobase += offset; 439 } 440#endif 441} 442 443static void __init fixup_port_mmio(int index, 444 struct device_node *np, 445 struct plat_serial8250_port *port) 446{ 447 DBG("fixup_port_mmio(%d)\n", index); 448 449 port->membase = ioremap(port->mapbase, 0x100); 450} 451 452/* 453 * This is called as an arch initcall, hopefully before the PCI bus is 454 * probed and/or the 8250 driver loaded since we need to register our 455 * platform devices before 8250 PCI ones are detected as some of them 456 * must properly "override" the platform ones. 457 * 458 * This function fixes up the interrupt value for platform ports as it 459 * couldn't be done earlier before interrupt maps have been parsed. It 460 * also "corrects" the IO address for PIO ports for the same reason, 461 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then 462 * registers all those platform ports for use by the 8250 driver when it 463 * finally loads. 464 */ 465static int __init serial_dev_init(void) 466{ 467 int i; 468 469 if (legacy_serial_count == 0) 470 return -ENODEV; 471 472 /* 473 * Before we register the platform serial devices, we need 474 * to fixup their interrupts and their IO ports. 475 */ 476 DBG("Fixing serial ports interrupts and IO ports ...\n"); 477 478 for (i = 0; i < legacy_serial_count; i++) { 479 struct plat_serial8250_port *port = &legacy_serial_ports[i]; 480 struct device_node *np = legacy_serial_infos[i].np; 481 482 if (port->irq == NO_IRQ) 483 fixup_port_irq(i, np, port); 484 if (port->iotype == UPIO_PORT) 485 fixup_port_pio(i, np, port); 486 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) 487 fixup_port_mmio(i, np, port); 488 } 489 490 DBG("Registering platform serial ports\n"); 491 492 return platform_device_register(&serial_device); 493} 494device_initcall(serial_dev_init); 495 496 497#ifdef CONFIG_SERIAL_8250_CONSOLE 498/* 499 * This is called very early, as part of console_init() (typically just after 500 * time_init()). This function is respondible for trying to find a good 501 * default console on serial ports. It tries to match the open firmware 502 * default output with one of the available serial console drivers that have 503 * been probed earlier by find_legacy_serial_ports() 504 */ 505static int __init check_legacy_serial_console(void) 506{ 507 struct device_node *prom_stdout = NULL; 508 int i, speed = 0, offset = 0; 509 const char *name; 510 const u32 *spd; 511 512 DBG(" -> check_legacy_serial_console()\n"); 513 514 /* The user has requested a console so this is already set up. */ 515 if (strstr(boot_command_line, "console=")) { 516 DBG(" console was specified !\n"); 517 return -EBUSY; 518 } 519 520 if (!of_chosen) { 521 DBG(" of_chosen is NULL !\n"); 522 return -ENODEV; 523 } 524 525 if (legacy_serial_console < 0) { 526 DBG(" legacy_serial_console not found !\n"); 527 return -ENODEV; 528 } 529 /* We are getting a weird phandle from OF ... */ 530 /* ... So use the full path instead */ 531 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 532 if (name == NULL) { 533 DBG(" no linux,stdout-path !\n"); 534 return -ENODEV; 535 } 536 prom_stdout = of_find_node_by_path(name); 537 if (!prom_stdout) { 538 DBG(" can't find stdout package %s !\n", name); 539 return -ENODEV; 540 } 541 DBG("stdout is %s\n", prom_stdout->full_name); 542 543 name = of_get_property(prom_stdout, "name", NULL); 544 if (!name) { 545 DBG(" stdout package has no name !\n"); 546 goto not_found; 547 } 548 spd = of_get_property(prom_stdout, "current-speed", NULL); 549 if (spd) 550 speed = *spd; 551 552 if (strcmp(name, "serial") != 0) 553 goto not_found; 554 555 /* Look for it in probed array */ 556 for (i = 0; i < legacy_serial_count; i++) { 557 if (prom_stdout != legacy_serial_infos[i].np) 558 continue; 559 offset = i; 560 speed = legacy_serial_infos[i].speed; 561 break; 562 } 563 if (i >= legacy_serial_count) 564 goto not_found; 565 566 of_node_put(prom_stdout); 567 568 DBG("Found serial console at ttyS%d\n", offset); 569 570 if (speed) { 571 static char __initdata opt[16]; 572 sprintf(opt, "%d", speed); 573 return add_preferred_console("ttyS", offset, opt); 574 } else 575 return add_preferred_console("ttyS", offset, NULL); 576 577 not_found: 578 DBG("No preferred console found !\n"); 579 of_node_put(prom_stdout); 580 return -ENODEV; 581} 582console_initcall(check_legacy_serial_console); 583 584#endif /* CONFIG_SERIAL_8250_CONSOLE */ 585