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463ce0e1 BH |
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> | |
1a7507c7 | 7 | #include <linux/of_device.h> |
463ce0e1 BH |
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; | |
0ebfff14 | 32 | int irq_check_parent; |
463ce0e1 BH |
33 | phys_addr_t taddr; |
34 | } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; | |
1a7507c7 PG |
35 | |
36 | static struct __initdata of_device_id parents[] = { | |
37 | {.type = "soc",}, | |
38 | {.type = "tsi-bridge",}, | |
39 | {.type = "opb", .compatible = "ibm,opb",}, | |
40 | {.compatible = "simple-bus",}, | |
41 | {.compatible = "wrs,epld-localbus",}, | |
42 | }; | |
43 | ||
463ce0e1 BH |
44 | static unsigned int legacy_serial_count; |
45 | static int legacy_serial_console = -1; | |
46 | ||
47 | static int __init add_legacy_port(struct device_node *np, int want_index, | |
48 | int iotype, phys_addr_t base, | |
b580d46c | 49 | phys_addr_t taddr, unsigned long irq, |
0ebfff14 | 50 | upf_t flags, int irq_check_parent) |
463ce0e1 | 51 | { |
a7f67bdf JK |
52 | const u32 *clk, *spd; |
53 | u32 clock = BASE_BAUD * 16; | |
463ce0e1 BH |
54 | int index; |
55 | ||
56 | /* get clock freq. if present */ | |
e2eb6392 | 57 | clk = of_get_property(np, "clock-frequency", NULL); |
31df1678 DW |
58 | if (clk && *clk) |
59 | clock = *clk; | |
463ce0e1 BH |
60 | |
61 | /* get default speed if present */ | |
e2eb6392 | 62 | spd = of_get_property(np, "current-speed", NULL); |
463ce0e1 BH |
63 | |
64 | /* If we have a location index, then try to use it */ | |
65 | if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) | |
66 | index = want_index; | |
67 | else | |
68 | index = legacy_serial_count; | |
69 | ||
70 | /* if our index is still out of range, that mean that | |
71 | * array is full, we could scan for a free slot but that | |
72 | * make little sense to bother, just skip the port | |
73 | */ | |
74 | if (index >= MAX_LEGACY_SERIAL_PORTS) | |
75 | return -1; | |
76 | if (index >= legacy_serial_count) | |
77 | legacy_serial_count = index + 1; | |
78 | ||
79 | /* Check if there is a port who already claimed our slot */ | |
80 | if (legacy_serial_infos[index].np != 0) { | |
81 | /* if we still have some room, move it, else override */ | |
82 | if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { | |
0ebfff14 | 83 | printk(KERN_DEBUG "Moved legacy port %d -> %d\n", |
463ce0e1 BH |
84 | index, legacy_serial_count); |
85 | legacy_serial_ports[legacy_serial_count] = | |
86 | legacy_serial_ports[index]; | |
87 | legacy_serial_infos[legacy_serial_count] = | |
88 | legacy_serial_infos[index]; | |
89 | legacy_serial_count++; | |
90 | } else { | |
0ebfff14 | 91 | printk(KERN_DEBUG "Replacing legacy port %d\n", index); |
463ce0e1 BH |
92 | } |
93 | } | |
94 | ||
95 | /* Now fill the entry */ | |
96 | memset(&legacy_serial_ports[index], 0, | |
97 | sizeof(struct plat_serial8250_port)); | |
98 | if (iotype == UPIO_PORT) | |
99 | legacy_serial_ports[index].iobase = base; | |
100 | else | |
8dacaedf | 101 | legacy_serial_ports[index].mapbase = base; |
463ce0e1 BH |
102 | legacy_serial_ports[index].iotype = iotype; |
103 | legacy_serial_ports[index].uartclk = clock; | |
104 | legacy_serial_ports[index].irq = irq; | |
b580d46c | 105 | legacy_serial_ports[index].flags = flags; |
463ce0e1 BH |
106 | legacy_serial_infos[index].taddr = taddr; |
107 | legacy_serial_infos[index].np = of_node_get(np); | |
108 | legacy_serial_infos[index].clock = clock; | |
109 | legacy_serial_infos[index].speed = spd ? *spd : 0; | |
0ebfff14 | 110 | legacy_serial_infos[index].irq_check_parent = irq_check_parent; |
463ce0e1 | 111 | |
0ebfff14 | 112 | printk(KERN_DEBUG "Found legacy serial port %d for %s\n", |
463ce0e1 | 113 | index, np->full_name); |
0ebfff14 | 114 | printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", |
463ce0e1 BH |
115 | (iotype == UPIO_PORT) ? "port" : "mem", |
116 | (unsigned long long)base, (unsigned long long)taddr, irq, | |
117 | legacy_serial_ports[index].uartclk, | |
118 | legacy_serial_infos[index].speed); | |
119 | ||
120 | return index; | |
121 | } | |
122 | ||
b580d46c KG |
123 | static int __init add_legacy_soc_port(struct device_node *np, |
124 | struct device_node *soc_dev) | |
125 | { | |
f704b8d1 | 126 | u64 addr; |
a7f67bdf | 127 | const u32 *addrp; |
abb4a239 DG |
128 | upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ |
129 | | UPF_FIXED_PORT; | |
be9633e9 | 130 | struct device_node *tsi = of_get_parent(np); |
b580d46c KG |
131 | |
132 | /* We only support ports that have a clock frequency properly | |
133 | * encoded in the device-tree. | |
134 | */ | |
e2eb6392 | 135 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
b580d46c KG |
136 | return -1; |
137 | ||
8d38a5b2 | 138 | /* if rtas uses this device, don't try to use it as well */ |
e2eb6392 | 139 | if (of_get_property(np, "used-by-rtas", NULL) != NULL) |
8d38a5b2 AB |
140 | return -1; |
141 | ||
b580d46c KG |
142 | /* Get the address */ |
143 | addrp = of_get_address(soc_dev, 0, NULL, NULL); | |
144 | if (addrp == NULL) | |
145 | return -1; | |
146 | ||
147 | addr = of_translate_address(soc_dev, addrp); | |
7c6efda5 BH |
148 | if (addr == OF_BAD_ADDR) |
149 | return -1; | |
b580d46c KG |
150 | |
151 | /* Add port, irq will be dealt with later. We passed a translated | |
152 | * IO port value. It will be fixed up later along with the irq | |
153 | */ | |
be9633e9 ZR |
154 | if (tsi && !strcmp(tsi->type, "tsi-bridge")) |
155 | return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); | |
156 | else | |
157 | return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); | |
b580d46c KG |
158 | } |
159 | ||
463ce0e1 | 160 | static int __init add_legacy_isa_port(struct device_node *np, |
017e0fad | 161 | struct device_node *isa_brg) |
463ce0e1 | 162 | { |
a7f67bdf JK |
163 | const u32 *reg; |
164 | const char *typep; | |
463ce0e1 | 165 | int index = -1; |
f704b8d1 | 166 | u64 taddr; |
463ce0e1 | 167 | |
7c6efda5 BH |
168 | DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); |
169 | ||
463ce0e1 | 170 | /* Get the ISA port number */ |
e2eb6392 | 171 | reg = of_get_property(np, "reg", NULL); |
463ce0e1 BH |
172 | if (reg == NULL) |
173 | return -1; | |
174 | ||
175 | /* Verify it's an IO port, we don't support anything else */ | |
176 | if (!(reg[0] & 0x00000001)) | |
177 | return -1; | |
178 | ||
179 | /* Now look for an "ibm,aix-loc" property that gives us ordering | |
180 | * if any... | |
181 | */ | |
e2eb6392 | 182 | typep = of_get_property(np, "ibm,aix-loc", NULL); |
463ce0e1 BH |
183 | |
184 | /* If we have a location index, then use it */ | |
185 | if (typep && *typep == 'S') | |
186 | index = simple_strtol(typep+1, NULL, 0) - 1; | |
187 | ||
f704b8d1 BH |
188 | /* Translate ISA address. If it fails, we still register the port |
189 | * with no translated address so that it can be picked up as an IO | |
190 | * port later by the serial driver | |
191 | */ | |
463ce0e1 | 192 | taddr = of_translate_address(np, reg); |
7c6efda5 | 193 | if (taddr == OF_BAD_ADDR) |
f704b8d1 | 194 | taddr = 0; |
463ce0e1 BH |
195 | |
196 | /* Add port, irq will be dealt with later */ | |
7c6efda5 | 197 | return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, |
0ebfff14 | 198 | NO_IRQ, UPF_BOOT_AUTOCONF, 0); |
463ce0e1 BH |
199 | |
200 | } | |
201 | ||
017e0fad | 202 | #ifdef CONFIG_PCI |
463ce0e1 BH |
203 | static int __init add_legacy_pci_port(struct device_node *np, |
204 | struct device_node *pci_dev) | |
205 | { | |
f704b8d1 | 206 | u64 addr, base; |
a7f67bdf | 207 | const u32 *addrp; |
d2dd482b | 208 | unsigned int flags; |
8dacaedf | 209 | int iotype, index = -1, lindex = 0; |
463ce0e1 | 210 | |
7c6efda5 BH |
211 | DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); |
212 | ||
463ce0e1 BH |
213 | /* We only support ports that have a clock frequency properly |
214 | * encoded in the device-tree (that is have an fcode). Anything | |
215 | * else can't be used that early and will be normally probed by | |
8dacaedf BH |
216 | * the generic 8250_pci driver later on. The reason is that 8250 |
217 | * compatible UARTs on PCI need all sort of quirks (port offsets | |
218 | * etc...) that this code doesn't know about | |
463ce0e1 | 219 | */ |
e2eb6392 | 220 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
463ce0e1 | 221 | return -1; |
463ce0e1 BH |
222 | |
223 | /* Get the PCI address. Assume BAR 0 */ | |
d2dd482b | 224 | addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); |
463ce0e1 BH |
225 | if (addrp == NULL) |
226 | return -1; | |
227 | ||
228 | /* We only support BAR 0 for now */ | |
d2dd482b | 229 | iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; |
463ce0e1 | 230 | addr = of_translate_address(pci_dev, addrp); |
7c6efda5 BH |
231 | if (addr == OF_BAD_ADDR) |
232 | return -1; | |
463ce0e1 BH |
233 | |
234 | /* Set the IO base to the same as the translated address for MMIO, | |
235 | * or to the domain local IO base for PIO (it will be fixed up later) | |
236 | */ | |
237 | if (iotype == UPIO_MEM) | |
238 | base = addr; | |
239 | else | |
240 | base = addrp[2]; | |
241 | ||
242 | /* Try to guess an index... If we have subdevices of the pci dev, | |
243 | * we get to their "reg" property | |
244 | */ | |
245 | if (np != pci_dev) { | |
e2eb6392 | 246 | const u32 *reg = of_get_property(np, "reg", NULL); |
463ce0e1 | 247 | if (reg && (*reg < 4)) |
8dacaedf BH |
248 | index = lindex = *reg; |
249 | } | |
250 | ||
251 | /* Local index means it's the Nth port in the PCI chip. Unfortunately | |
252 | * the offset to add here is device specific. We know about those | |
253 | * EXAR ports and we default to the most common case. If your UART | |
254 | * doesn't work for these settings, you'll have to add your own special | |
255 | * cases here | |
256 | */ | |
55b61fec SR |
257 | if (of_device_is_compatible(pci_dev, "pci13a8,152") || |
258 | of_device_is_compatible(pci_dev, "pci13a8,154") || | |
259 | of_device_is_compatible(pci_dev, "pci13a8,158")) { | |
8dacaedf BH |
260 | addr += 0x200 * lindex; |
261 | base += 0x200 * lindex; | |
262 | } else { | |
263 | addr += 8 * lindex; | |
264 | base += 8 * lindex; | |
463ce0e1 BH |
265 | } |
266 | ||
267 | /* Add port, irq will be dealt with later. We passed a translated | |
268 | * IO port value. It will be fixed up later along with the irq | |
269 | */ | |
0ebfff14 BH |
270 | return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, |
271 | UPF_BOOT_AUTOCONF, np != pci_dev); | |
463ce0e1 | 272 | } |
017e0fad | 273 | #endif |
463ce0e1 | 274 | |
37a801c7 MN |
275 | static void __init setup_legacy_serial_console(int console) |
276 | { | |
277 | struct legacy_serial_info *info = | |
278 | &legacy_serial_infos[console]; | |
279 | void __iomem *addr; | |
280 | ||
281 | if (info->taddr == 0) | |
282 | return; | |
283 | addr = ioremap(info->taddr, 0x1000); | |
284 | if (addr == NULL) | |
285 | return; | |
286 | if (info->speed == 0) | |
287 | info->speed = udbg_probe_uart_speed(addr, info->clock); | |
288 | DBG("default console speed = %d\n", info->speed); | |
289 | udbg_init_uart(addr, info->speed, info->clock); | |
290 | } | |
291 | ||
463ce0e1 BH |
292 | /* |
293 | * This is called very early, as part of setup_system() or eventually | |
294 | * setup_arch(), basically before anything else in this file. This function | |
295 | * will try to build a list of all the available 8250-compatible serial ports | |
296 | * in the machine using the Open Firmware device-tree. It currently only deals | |
297 | * with ISA and PCI busses but could be extended. It allows a very early boot | |
298 | * console to be initialized, that list is also used later to provide 8250 with | |
299 | * the machine non-PCI ports and to properly pick the default console port | |
300 | */ | |
301 | void __init find_legacy_serial_ports(void) | |
302 | { | |
b580d46c | 303 | struct device_node *np, *stdout = NULL; |
a7f67bdf | 304 | const char *path; |
463ce0e1 BH |
305 | int index; |
306 | ||
307 | DBG(" -> find_legacy_serial_port()\n"); | |
308 | ||
309 | /* Now find out if one of these is out firmware console */ | |
e2eb6392 | 310 | path = of_get_property(of_chosen, "linux,stdout-path", NULL); |
b580d46c KG |
311 | if (path != NULL) { |
312 | stdout = of_find_node_by_path(path); | |
313 | if (stdout) | |
314 | DBG("stdout is %s\n", stdout->full_name); | |
315 | } else { | |
463ce0e1 | 316 | DBG(" no linux,stdout-path !\n"); |
463ce0e1 | 317 | } |
b580d46c | 318 | |
1a7507c7 | 319 | /* Iterate over all the 16550 ports, looking for known parents */ |
3329c0d1 | 320 | for_each_compatible_node(np, "serial", "ns16550") { |
1a7507c7 PG |
321 | struct device_node *parent = of_get_parent(np); |
322 | if (!parent) | |
323 | continue; | |
324 | if (of_match_node(parents, parent) != NULL) { | |
b580d46c KG |
325 | index = add_legacy_soc_port(np, np); |
326 | if (index >= 0 && np == stdout) | |
327 | legacy_serial_console = index; | |
328 | } | |
1a7507c7 | 329 | of_node_put(parent); |
463ce0e1 BH |
330 | } |
331 | ||
1a7507c7 | 332 | /* Next, fill our array with ISA ports */ |
3329c0d1 | 333 | for_each_node_by_type(np, "serial") { |
463ce0e1 BH |
334 | struct device_node *isa = of_get_parent(np); |
335 | if (isa && !strcmp(isa->name, "isa")) { | |
336 | index = add_legacy_isa_port(np, isa); | |
337 | if (index >= 0 && np == stdout) | |
338 | legacy_serial_console = index; | |
339 | } | |
340 | of_node_put(isa); | |
341 | } | |
342 | ||
017e0fad | 343 | #ifdef CONFIG_PCI |
463ce0e1 BH |
344 | /* Next, try to locate PCI ports */ |
345 | for (np = NULL; (np = of_find_all_nodes(np));) { | |
346 | struct device_node *pci, *parent = of_get_parent(np); | |
347 | if (parent && !strcmp(parent->name, "isa")) { | |
348 | of_node_put(parent); | |
349 | continue; | |
350 | } | |
351 | if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { | |
352 | of_node_put(parent); | |
353 | continue; | |
354 | } | |
355 | /* Check for known pciclass, and also check wether we have | |
356 | * a device with child nodes for ports or not | |
357 | */ | |
55b61fec SR |
358 | if (of_device_is_compatible(np, "pciclass,0700") || |
359 | of_device_is_compatible(np, "pciclass,070002")) | |
463ce0e1 | 360 | pci = np; |
55b61fec SR |
361 | else if (of_device_is_compatible(parent, "pciclass,0700") || |
362 | of_device_is_compatible(parent, "pciclass,070002")) | |
463ce0e1 BH |
363 | pci = parent; |
364 | else { | |
365 | of_node_put(parent); | |
366 | continue; | |
367 | } | |
368 | index = add_legacy_pci_port(np, pci); | |
369 | if (index >= 0 && np == stdout) | |
370 | legacy_serial_console = index; | |
371 | of_node_put(parent); | |
372 | } | |
017e0fad | 373 | #endif |
463ce0e1 BH |
374 | |
375 | DBG("legacy_serial_console = %d\n", legacy_serial_console); | |
37a801c7 MN |
376 | if (legacy_serial_console >= 0) |
377 | setup_legacy_serial_console(legacy_serial_console); | |
463ce0e1 BH |
378 | DBG(" <- find_legacy_serial_port()\n"); |
379 | } | |
380 | ||
381 | static struct platform_device serial_device = { | |
382 | .name = "serial8250", | |
383 | .id = PLAT8250_DEV_PLATFORM, | |
384 | .dev = { | |
385 | .platform_data = legacy_serial_ports, | |
386 | }, | |
387 | }; | |
388 | ||
389 | static void __init fixup_port_irq(int index, | |
390 | struct device_node *np, | |
391 | struct plat_serial8250_port *port) | |
392 | { | |
0ebfff14 BH |
393 | unsigned int virq; |
394 | ||
463ce0e1 BH |
395 | DBG("fixup_port_irq(%d)\n", index); |
396 | ||
0ebfff14 BH |
397 | virq = irq_of_parse_and_map(np, 0); |
398 | if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { | |
399 | np = of_get_parent(np); | |
400 | if (np == NULL) | |
401 | return; | |
402 | virq = irq_of_parse_and_map(np, 0); | |
403 | of_node_put(np); | |
463ce0e1 | 404 | } |
0ebfff14 | 405 | if (virq == NO_IRQ) |
463ce0e1 BH |
406 | return; |
407 | ||
0ebfff14 | 408 | port->irq = virq; |
463ce0e1 BH |
409 | } |
410 | ||
411 | static void __init fixup_port_pio(int index, | |
412 | struct device_node *np, | |
413 | struct plat_serial8250_port *port) | |
414 | { | |
017e0fad | 415 | #ifdef CONFIG_PCI |
463ce0e1 BH |
416 | struct pci_controller *hose; |
417 | ||
418 | DBG("fixup_port_pio(%d)\n", index); | |
419 | ||
420 | hose = pci_find_hose_for_OF_device(np); | |
421 | if (hose) { | |
422 | unsigned long offset = (unsigned long)hose->io_base_virt - | |
423 | #ifdef CONFIG_PPC64 | |
424 | pci_io_base; | |
425 | #else | |
426 | isa_io_base; | |
427 | #endif | |
428 | DBG("port %d, IO %lx -> %lx\n", | |
429 | index, port->iobase, port->iobase + offset); | |
430 | port->iobase += offset; | |
431 | } | |
017e0fad | 432 | #endif |
463ce0e1 BH |
433 | } |
434 | ||
8dacaedf BH |
435 | static void __init fixup_port_mmio(int index, |
436 | struct device_node *np, | |
437 | struct plat_serial8250_port *port) | |
438 | { | |
439 | DBG("fixup_port_mmio(%d)\n", index); | |
440 | ||
441 | port->membase = ioremap(port->mapbase, 0x100); | |
442 | } | |
443 | ||
463ce0e1 BH |
444 | /* |
445 | * This is called as an arch initcall, hopefully before the PCI bus is | |
446 | * probed and/or the 8250 driver loaded since we need to register our | |
447 | * platform devices before 8250 PCI ones are detected as some of them | |
448 | * must properly "override" the platform ones. | |
449 | * | |
450 | * This function fixes up the interrupt value for platform ports as it | |
451 | * couldn't be done earlier before interrupt maps have been parsed. It | |
452 | * also "corrects" the IO address for PIO ports for the same reason, | |
453 | * since earlier, the PHBs virtual IO space wasn't assigned yet. It then | |
454 | * registers all those platform ports for use by the 8250 driver when it | |
455 | * finally loads. | |
456 | */ | |
457 | static int __init serial_dev_init(void) | |
458 | { | |
459 | int i; | |
460 | ||
461 | if (legacy_serial_count == 0) | |
462 | return -ENODEV; | |
463 | ||
464 | /* | |
465 | * Before we register the platfrom serial devices, we need | |
00d70419 | 466 | * to fixup their interrupts and their IO ports. |
463ce0e1 BH |
467 | */ |
468 | DBG("Fixing serial ports interrupts and IO ports ...\n"); | |
469 | ||
470 | for (i = 0; i < legacy_serial_count; i++) { | |
471 | struct plat_serial8250_port *port = &legacy_serial_ports[i]; | |
472 | struct device_node *np = legacy_serial_infos[i].np; | |
473 | ||
474 | if (port->irq == NO_IRQ) | |
475 | fixup_port_irq(i, np, port); | |
476 | if (port->iotype == UPIO_PORT) | |
477 | fixup_port_pio(i, np, port); | |
be9633e9 | 478 | if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) |
8dacaedf | 479 | fixup_port_mmio(i, np, port); |
463ce0e1 BH |
480 | } |
481 | ||
482 | DBG("Registering platform serial ports\n"); | |
483 | ||
484 | return platform_device_register(&serial_device); | |
485 | } | |
ee56c474 | 486 | device_initcall(serial_dev_init); |
463ce0e1 BH |
487 | |
488 | ||
489 | /* | |
490 | * This is called very early, as part of console_init() (typically just after | |
491 | * time_init()). This function is respondible for trying to find a good | |
492 | * default console on serial ports. It tries to match the open firmware | |
493 | * default output with one of the available serial console drivers, either | |
494 | * one of the platform serial ports that have been probed earlier by | |
495 | * find_legacy_serial_ports() or some more platform specific ones. | |
496 | */ | |
497 | static int __init check_legacy_serial_console(void) | |
498 | { | |
499 | struct device_node *prom_stdout = NULL; | |
500 | int speed = 0, offset = 0; | |
a7f67bdf JK |
501 | const char *name; |
502 | const u32 *spd; | |
463ce0e1 BH |
503 | |
504 | DBG(" -> check_legacy_serial_console()\n"); | |
505 | ||
506 | /* The user has requested a console so this is already set up. */ | |
b8757b21 | 507 | if (strstr(boot_command_line, "console=")) { |
463ce0e1 BH |
508 | DBG(" console was specified !\n"); |
509 | return -EBUSY; | |
510 | } | |
511 | ||
512 | if (!of_chosen) { | |
513 | DBG(" of_chosen is NULL !\n"); | |
514 | return -ENODEV; | |
515 | } | |
b580d46c KG |
516 | |
517 | if (legacy_serial_console < 0) { | |
518 | DBG(" legacy_serial_console not found !\n"); | |
519 | return -ENODEV; | |
520 | } | |
463ce0e1 BH |
521 | /* We are getting a weird phandle from OF ... */ |
522 | /* ... So use the full path instead */ | |
e2eb6392 | 523 | name = of_get_property(of_chosen, "linux,stdout-path", NULL); |
463ce0e1 BH |
524 | if (name == NULL) { |
525 | DBG(" no linux,stdout-path !\n"); | |
526 | return -ENODEV; | |
527 | } | |
528 | prom_stdout = of_find_node_by_path(name); | |
529 | if (!prom_stdout) { | |
530 | DBG(" can't find stdout package %s !\n", name); | |
531 | return -ENODEV; | |
532 | } | |
533 | DBG("stdout is %s\n", prom_stdout->full_name); | |
534 | ||
e2eb6392 | 535 | name = of_get_property(prom_stdout, "name", NULL); |
463ce0e1 BH |
536 | if (!name) { |
537 | DBG(" stdout package has no name !\n"); | |
538 | goto not_found; | |
539 | } | |
e2eb6392 | 540 | spd = of_get_property(prom_stdout, "current-speed", NULL); |
463ce0e1 BH |
541 | if (spd) |
542 | speed = *spd; | |
543 | ||
544 | if (0) | |
545 | ; | |
546 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
547 | else if (strcmp(name, "serial") == 0) { | |
548 | int i; | |
549 | /* Look for it in probed array */ | |
550 | for (i = 0; i < legacy_serial_count; i++) { | |
551 | if (prom_stdout != legacy_serial_infos[i].np) | |
552 | continue; | |
553 | offset = i; | |
554 | speed = legacy_serial_infos[i].speed; | |
555 | break; | |
556 | } | |
557 | if (i >= legacy_serial_count) | |
558 | goto not_found; | |
559 | } | |
560 | #endif /* CONFIG_SERIAL_8250_CONSOLE */ | |
561 | #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE | |
562 | else if (strcmp(name, "ch-a") == 0) | |
563 | offset = 0; | |
564 | else if (strcmp(name, "ch-b") == 0) | |
565 | offset = 1; | |
566 | #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ | |
567 | else | |
568 | goto not_found; | |
569 | of_node_put(prom_stdout); | |
570 | ||
571 | DBG("Found serial console at ttyS%d\n", offset); | |
572 | ||
573 | if (speed) { | |
574 | static char __initdata opt[16]; | |
575 | sprintf(opt, "%d", speed); | |
576 | return add_preferred_console("ttyS", offset, opt); | |
577 | } else | |
578 | return add_preferred_console("ttyS", offset, NULL); | |
579 | ||
580 | not_found: | |
581 | DBG("No preferred console found !\n"); | |
582 | of_node_put(prom_stdout); | |
583 | return -ENODEV; | |
584 | } | |
585 | console_initcall(check_legacy_serial_console); | |
586 |