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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> | |
7 | #include <asm/io.h> | |
8 | #include <asm/mmu.h> | |
9 | #include <asm/prom.h> | |
10 | #include <asm/serial.h> | |
11 | #include <asm/udbg.h> | |
12 | #include <asm/pci-bridge.h> | |
13 | #include <asm/ppc-pci.h> | |
14 | ||
15 | #undef DEBUG | |
16 | ||
17 | #ifdef DEBUG | |
18 | #define DBG(fmt...) do { printk(fmt); } while(0) | |
19 | #else | |
20 | #define DBG(fmt...) do { } while(0) | |
21 | #endif | |
22 | ||
23 | #define MAX_LEGACY_SERIAL_PORTS 8 | |
24 | ||
25 | static struct plat_serial8250_port | |
26 | legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; | |
27 | static struct legacy_serial_info { | |
28 | struct device_node *np; | |
29 | unsigned int speed; | |
30 | unsigned int clock; | |
0ebfff14 | 31 | int irq_check_parent; |
463ce0e1 BH |
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, | |
b580d46c | 39 | phys_addr_t taddr, unsigned long irq, |
0ebfff14 | 40 | upf_t flags, int irq_check_parent) |
463ce0e1 | 41 | { |
a7f67bdf JK |
42 | const u32 *clk, *spd; |
43 | u32 clock = BASE_BAUD * 16; | |
463ce0e1 BH |
44 | int index; |
45 | ||
46 | /* get clock freq. if present */ | |
e2eb6392 | 47 | clk = of_get_property(np, "clock-frequency", NULL); |
31df1678 DW |
48 | if (clk && *clk) |
49 | clock = *clk; | |
463ce0e1 BH |
50 | |
51 | /* get default speed if present */ | |
e2eb6392 | 52 | spd = of_get_property(np, "current-speed", NULL); |
463ce0e1 BH |
53 | |
54 | /* If we have a location index, then try to use it */ | |
55 | if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) | |
56 | index = want_index; | |
57 | else | |
58 | index = legacy_serial_count; | |
59 | ||
60 | /* if our index is still out of range, that mean that | |
61 | * array is full, we could scan for a free slot but that | |
62 | * make little sense to bother, just skip the port | |
63 | */ | |
64 | if (index >= MAX_LEGACY_SERIAL_PORTS) | |
65 | return -1; | |
66 | if (index >= legacy_serial_count) | |
67 | legacy_serial_count = index + 1; | |
68 | ||
69 | /* Check if there is a port who already claimed our slot */ | |
70 | if (legacy_serial_infos[index].np != 0) { | |
71 | /* if we still have some room, move it, else override */ | |
72 | if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { | |
0ebfff14 | 73 | printk(KERN_DEBUG "Moved legacy port %d -> %d\n", |
463ce0e1 BH |
74 | index, legacy_serial_count); |
75 | legacy_serial_ports[legacy_serial_count] = | |
76 | legacy_serial_ports[index]; | |
77 | legacy_serial_infos[legacy_serial_count] = | |
78 | legacy_serial_infos[index]; | |
79 | legacy_serial_count++; | |
80 | } else { | |
0ebfff14 | 81 | printk(KERN_DEBUG "Replacing legacy port %d\n", index); |
463ce0e1 BH |
82 | } |
83 | } | |
84 | ||
85 | /* Now fill the entry */ | |
86 | memset(&legacy_serial_ports[index], 0, | |
87 | sizeof(struct plat_serial8250_port)); | |
88 | if (iotype == UPIO_PORT) | |
89 | legacy_serial_ports[index].iobase = base; | |
90 | else | |
8dacaedf | 91 | legacy_serial_ports[index].mapbase = base; |
463ce0e1 BH |
92 | legacy_serial_ports[index].iotype = iotype; |
93 | legacy_serial_ports[index].uartclk = clock; | |
94 | legacy_serial_ports[index].irq = irq; | |
b580d46c | 95 | legacy_serial_ports[index].flags = flags; |
463ce0e1 BH |
96 | legacy_serial_infos[index].taddr = taddr; |
97 | legacy_serial_infos[index].np = of_node_get(np); | |
98 | legacy_serial_infos[index].clock = clock; | |
99 | legacy_serial_infos[index].speed = spd ? *spd : 0; | |
0ebfff14 | 100 | legacy_serial_infos[index].irq_check_parent = irq_check_parent; |
463ce0e1 | 101 | |
0ebfff14 | 102 | printk(KERN_DEBUG "Found legacy serial port %d for %s\n", |
463ce0e1 | 103 | index, np->full_name); |
0ebfff14 | 104 | printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", |
463ce0e1 BH |
105 | (iotype == UPIO_PORT) ? "port" : "mem", |
106 | (unsigned long long)base, (unsigned long long)taddr, irq, | |
107 | legacy_serial_ports[index].uartclk, | |
108 | legacy_serial_infos[index].speed); | |
109 | ||
110 | return index; | |
111 | } | |
112 | ||
b580d46c KG |
113 | static int __init add_legacy_soc_port(struct device_node *np, |
114 | struct device_node *soc_dev) | |
115 | { | |
f704b8d1 | 116 | u64 addr; |
a7f67bdf | 117 | const u32 *addrp; |
abb4a239 DG |
118 | upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ |
119 | | UPF_FIXED_PORT; | |
be9633e9 | 120 | struct device_node *tsi = of_get_parent(np); |
b580d46c KG |
121 | |
122 | /* We only support ports that have a clock frequency properly | |
123 | * encoded in the device-tree. | |
124 | */ | |
e2eb6392 | 125 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
b580d46c KG |
126 | return -1; |
127 | ||
8d38a5b2 | 128 | /* if rtas uses this device, don't try to use it as well */ |
e2eb6392 | 129 | if (of_get_property(np, "used-by-rtas", NULL) != NULL) |
8d38a5b2 AB |
130 | return -1; |
131 | ||
b580d46c KG |
132 | /* Get the address */ |
133 | addrp = of_get_address(soc_dev, 0, NULL, NULL); | |
134 | if (addrp == NULL) | |
135 | return -1; | |
136 | ||
137 | addr = of_translate_address(soc_dev, addrp); | |
7c6efda5 BH |
138 | if (addr == OF_BAD_ADDR) |
139 | return -1; | |
b580d46c KG |
140 | |
141 | /* Add port, irq will be dealt with later. We passed a translated | |
142 | * IO port value. It will be fixed up later along with the irq | |
143 | */ | |
be9633e9 ZR |
144 | if (tsi && !strcmp(tsi->type, "tsi-bridge")) |
145 | return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); | |
146 | else | |
147 | return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); | |
b580d46c KG |
148 | } |
149 | ||
463ce0e1 | 150 | static int __init add_legacy_isa_port(struct device_node *np, |
017e0fad | 151 | struct device_node *isa_brg) |
463ce0e1 | 152 | { |
a7f67bdf JK |
153 | const u32 *reg; |
154 | const char *typep; | |
463ce0e1 | 155 | int index = -1; |
f704b8d1 | 156 | u64 taddr; |
463ce0e1 | 157 | |
7c6efda5 BH |
158 | DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); |
159 | ||
463ce0e1 | 160 | /* Get the ISA port number */ |
e2eb6392 | 161 | reg = of_get_property(np, "reg", NULL); |
463ce0e1 BH |
162 | if (reg == NULL) |
163 | return -1; | |
164 | ||
165 | /* Verify it's an IO port, we don't support anything else */ | |
166 | if (!(reg[0] & 0x00000001)) | |
167 | return -1; | |
168 | ||
169 | /* Now look for an "ibm,aix-loc" property that gives us ordering | |
170 | * if any... | |
171 | */ | |
e2eb6392 | 172 | typep = of_get_property(np, "ibm,aix-loc", NULL); |
463ce0e1 BH |
173 | |
174 | /* If we have a location index, then use it */ | |
175 | if (typep && *typep == 'S') | |
176 | index = simple_strtol(typep+1, NULL, 0) - 1; | |
177 | ||
f704b8d1 BH |
178 | /* Translate ISA address. If it fails, we still register the port |
179 | * with no translated address so that it can be picked up as an IO | |
180 | * port later by the serial driver | |
181 | */ | |
463ce0e1 | 182 | taddr = of_translate_address(np, reg); |
7c6efda5 | 183 | if (taddr == OF_BAD_ADDR) |
f704b8d1 | 184 | taddr = 0; |
463ce0e1 BH |
185 | |
186 | /* Add port, irq will be dealt with later */ | |
7c6efda5 | 187 | return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, |
0ebfff14 | 188 | NO_IRQ, UPF_BOOT_AUTOCONF, 0); |
463ce0e1 BH |
189 | |
190 | } | |
191 | ||
017e0fad | 192 | #ifdef CONFIG_PCI |
463ce0e1 BH |
193 | static int __init add_legacy_pci_port(struct device_node *np, |
194 | struct device_node *pci_dev) | |
195 | { | |
f704b8d1 | 196 | u64 addr, base; |
a7f67bdf | 197 | const u32 *addrp; |
d2dd482b | 198 | unsigned int flags; |
8dacaedf | 199 | int iotype, index = -1, lindex = 0; |
463ce0e1 | 200 | |
7c6efda5 BH |
201 | DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); |
202 | ||
463ce0e1 BH |
203 | /* We only support ports that have a clock frequency properly |
204 | * encoded in the device-tree (that is have an fcode). Anything | |
205 | * else can't be used that early and will be normally probed by | |
8dacaedf BH |
206 | * the generic 8250_pci driver later on. The reason is that 8250 |
207 | * compatible UARTs on PCI need all sort of quirks (port offsets | |
208 | * etc...) that this code doesn't know about | |
463ce0e1 | 209 | */ |
e2eb6392 | 210 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
463ce0e1 | 211 | return -1; |
463ce0e1 BH |
212 | |
213 | /* Get the PCI address. Assume BAR 0 */ | |
d2dd482b | 214 | addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); |
463ce0e1 BH |
215 | if (addrp == NULL) |
216 | return -1; | |
217 | ||
218 | /* We only support BAR 0 for now */ | |
d2dd482b | 219 | iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; |
463ce0e1 | 220 | addr = of_translate_address(pci_dev, addrp); |
7c6efda5 BH |
221 | if (addr == OF_BAD_ADDR) |
222 | return -1; | |
463ce0e1 BH |
223 | |
224 | /* Set the IO base to the same as the translated address for MMIO, | |
225 | * or to the domain local IO base for PIO (it will be fixed up later) | |
226 | */ | |
227 | if (iotype == UPIO_MEM) | |
228 | base = addr; | |
229 | else | |
230 | base = addrp[2]; | |
231 | ||
232 | /* Try to guess an index... If we have subdevices of the pci dev, | |
233 | * we get to their "reg" property | |
234 | */ | |
235 | if (np != pci_dev) { | |
e2eb6392 | 236 | const u32 *reg = of_get_property(np, "reg", NULL); |
463ce0e1 | 237 | if (reg && (*reg < 4)) |
8dacaedf BH |
238 | index = lindex = *reg; |
239 | } | |
240 | ||
241 | /* Local index means it's the Nth port in the PCI chip. Unfortunately | |
242 | * the offset to add here is device specific. We know about those | |
243 | * EXAR ports and we default to the most common case. If your UART | |
244 | * doesn't work for these settings, you'll have to add your own special | |
245 | * cases here | |
246 | */ | |
55b61fec SR |
247 | if (of_device_is_compatible(pci_dev, "pci13a8,152") || |
248 | of_device_is_compatible(pci_dev, "pci13a8,154") || | |
249 | of_device_is_compatible(pci_dev, "pci13a8,158")) { | |
8dacaedf BH |
250 | addr += 0x200 * lindex; |
251 | base += 0x200 * lindex; | |
252 | } else { | |
253 | addr += 8 * lindex; | |
254 | base += 8 * lindex; | |
463ce0e1 BH |
255 | } |
256 | ||
257 | /* Add port, irq will be dealt with later. We passed a translated | |
258 | * IO port value. It will be fixed up later along with the irq | |
259 | */ | |
0ebfff14 BH |
260 | return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, |
261 | UPF_BOOT_AUTOCONF, np != pci_dev); | |
463ce0e1 | 262 | } |
017e0fad | 263 | #endif |
463ce0e1 | 264 | |
37a801c7 MN |
265 | static void __init setup_legacy_serial_console(int console) |
266 | { | |
267 | struct legacy_serial_info *info = | |
268 | &legacy_serial_infos[console]; | |
269 | void __iomem *addr; | |
270 | ||
271 | if (info->taddr == 0) | |
272 | return; | |
273 | addr = ioremap(info->taddr, 0x1000); | |
274 | if (addr == NULL) | |
275 | return; | |
276 | if (info->speed == 0) | |
277 | info->speed = udbg_probe_uart_speed(addr, info->clock); | |
278 | DBG("default console speed = %d\n", info->speed); | |
279 | udbg_init_uart(addr, info->speed, info->clock); | |
280 | } | |
281 | ||
463ce0e1 BH |
282 | /* |
283 | * This is called very early, as part of setup_system() or eventually | |
284 | * setup_arch(), basically before anything else in this file. This function | |
285 | * will try to build a list of all the available 8250-compatible serial ports | |
286 | * in the machine using the Open Firmware device-tree. It currently only deals | |
287 | * with ISA and PCI busses but could be extended. It allows a very early boot | |
288 | * console to be initialized, that list is also used later to provide 8250 with | |
289 | * the machine non-PCI ports and to properly pick the default console port | |
290 | */ | |
291 | void __init find_legacy_serial_ports(void) | |
292 | { | |
b580d46c | 293 | struct device_node *np, *stdout = NULL; |
a7f67bdf | 294 | const char *path; |
463ce0e1 BH |
295 | int index; |
296 | ||
297 | DBG(" -> find_legacy_serial_port()\n"); | |
298 | ||
299 | /* Now find out if one of these is out firmware console */ | |
e2eb6392 | 300 | path = of_get_property(of_chosen, "linux,stdout-path", NULL); |
b580d46c KG |
301 | if (path != NULL) { |
302 | stdout = of_find_node_by_path(path); | |
303 | if (stdout) | |
304 | DBG("stdout is %s\n", stdout->full_name); | |
305 | } else { | |
463ce0e1 | 306 | DBG(" no linux,stdout-path !\n"); |
463ce0e1 | 307 | } |
b580d46c KG |
308 | |
309 | /* First fill our array with SOC ports */ | |
310 | for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) { | |
311 | struct device_node *soc = of_get_parent(np); | |
312 | if (soc && !strcmp(soc->type, "soc")) { | |
313 | index = add_legacy_soc_port(np, np); | |
314 | if (index >= 0 && np == stdout) | |
315 | legacy_serial_console = index; | |
316 | } | |
317 | of_node_put(soc); | |
463ce0e1 BH |
318 | } |
319 | ||
320 | /* First fill our array with ISA ports */ | |
321 | for (np = NULL; (np = of_find_node_by_type(np, "serial"));) { | |
322 | struct device_node *isa = of_get_parent(np); | |
323 | if (isa && !strcmp(isa->name, "isa")) { | |
324 | index = add_legacy_isa_port(np, isa); | |
325 | if (index >= 0 && np == stdout) | |
326 | legacy_serial_console = index; | |
327 | } | |
328 | of_node_put(isa); | |
329 | } | |
330 | ||
c5d56332 ZR |
331 | /* First fill our array with tsi-bridge ports */ |
332 | for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) { | |
333 | struct device_node *tsi = of_get_parent(np); | |
334 | if (tsi && !strcmp(tsi->type, "tsi-bridge")) { | |
335 | index = add_legacy_soc_port(np, np); | |
336 | if (index >= 0 && np == stdout) | |
337 | legacy_serial_console = index; | |
338 | } | |
339 | of_node_put(tsi); | |
340 | } | |
341 | ||
8d38a5b2 | 342 | /* First fill our array with opb bus ports */ |
b63db45c | 343 | for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) { |
8d38a5b2 | 344 | struct device_node *opb = of_get_parent(np); |
b63db45c VB |
345 | if (opb && (!strcmp(opb->type, "opb") || |
346 | of_device_is_compatible(opb, "ibm,opb"))) { | |
8d38a5b2 AB |
347 | index = add_legacy_soc_port(np, np); |
348 | if (index >= 0 && np == stdout) | |
349 | legacy_serial_console = index; | |
350 | } | |
351 | of_node_put(opb); | |
352 | } | |
353 | ||
017e0fad | 354 | #ifdef CONFIG_PCI |
463ce0e1 BH |
355 | /* Next, try to locate PCI ports */ |
356 | for (np = NULL; (np = of_find_all_nodes(np));) { | |
357 | struct device_node *pci, *parent = of_get_parent(np); | |
358 | if (parent && !strcmp(parent->name, "isa")) { | |
359 | of_node_put(parent); | |
360 | continue; | |
361 | } | |
362 | if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { | |
363 | of_node_put(parent); | |
364 | continue; | |
365 | } | |
366 | /* Check for known pciclass, and also check wether we have | |
367 | * a device with child nodes for ports or not | |
368 | */ | |
55b61fec SR |
369 | if (of_device_is_compatible(np, "pciclass,0700") || |
370 | of_device_is_compatible(np, "pciclass,070002")) | |
463ce0e1 | 371 | pci = np; |
55b61fec SR |
372 | else if (of_device_is_compatible(parent, "pciclass,0700") || |
373 | of_device_is_compatible(parent, "pciclass,070002")) | |
463ce0e1 BH |
374 | pci = parent; |
375 | else { | |
376 | of_node_put(parent); | |
377 | continue; | |
378 | } | |
379 | index = add_legacy_pci_port(np, pci); | |
380 | if (index >= 0 && np == stdout) | |
381 | legacy_serial_console = index; | |
382 | of_node_put(parent); | |
383 | } | |
017e0fad | 384 | #endif |
463ce0e1 BH |
385 | |
386 | DBG("legacy_serial_console = %d\n", legacy_serial_console); | |
37a801c7 MN |
387 | if (legacy_serial_console >= 0) |
388 | setup_legacy_serial_console(legacy_serial_console); | |
463ce0e1 BH |
389 | DBG(" <- find_legacy_serial_port()\n"); |
390 | } | |
391 | ||
392 | static struct platform_device serial_device = { | |
393 | .name = "serial8250", | |
394 | .id = PLAT8250_DEV_PLATFORM, | |
395 | .dev = { | |
396 | .platform_data = legacy_serial_ports, | |
397 | }, | |
398 | }; | |
399 | ||
400 | static void __init fixup_port_irq(int index, | |
401 | struct device_node *np, | |
402 | struct plat_serial8250_port *port) | |
403 | { | |
0ebfff14 BH |
404 | unsigned int virq; |
405 | ||
463ce0e1 BH |
406 | DBG("fixup_port_irq(%d)\n", index); |
407 | ||
0ebfff14 BH |
408 | virq = irq_of_parse_and_map(np, 0); |
409 | if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { | |
410 | np = of_get_parent(np); | |
411 | if (np == NULL) | |
412 | return; | |
413 | virq = irq_of_parse_and_map(np, 0); | |
414 | of_node_put(np); | |
463ce0e1 | 415 | } |
0ebfff14 | 416 | if (virq == NO_IRQ) |
463ce0e1 BH |
417 | return; |
418 | ||
0ebfff14 | 419 | port->irq = virq; |
463ce0e1 BH |
420 | } |
421 | ||
422 | static void __init fixup_port_pio(int index, | |
423 | struct device_node *np, | |
424 | struct plat_serial8250_port *port) | |
425 | { | |
017e0fad | 426 | #ifdef CONFIG_PCI |
463ce0e1 BH |
427 | struct pci_controller *hose; |
428 | ||
429 | DBG("fixup_port_pio(%d)\n", index); | |
430 | ||
431 | hose = pci_find_hose_for_OF_device(np); | |
432 | if (hose) { | |
433 | unsigned long offset = (unsigned long)hose->io_base_virt - | |
434 | #ifdef CONFIG_PPC64 | |
435 | pci_io_base; | |
436 | #else | |
437 | isa_io_base; | |
438 | #endif | |
439 | DBG("port %d, IO %lx -> %lx\n", | |
440 | index, port->iobase, port->iobase + offset); | |
441 | port->iobase += offset; | |
442 | } | |
017e0fad | 443 | #endif |
463ce0e1 BH |
444 | } |
445 | ||
8dacaedf BH |
446 | static void __init fixup_port_mmio(int index, |
447 | struct device_node *np, | |
448 | struct plat_serial8250_port *port) | |
449 | { | |
450 | DBG("fixup_port_mmio(%d)\n", index); | |
451 | ||
452 | port->membase = ioremap(port->mapbase, 0x100); | |
453 | } | |
454 | ||
463ce0e1 BH |
455 | /* |
456 | * This is called as an arch initcall, hopefully before the PCI bus is | |
457 | * probed and/or the 8250 driver loaded since we need to register our | |
458 | * platform devices before 8250 PCI ones are detected as some of them | |
459 | * must properly "override" the platform ones. | |
460 | * | |
461 | * This function fixes up the interrupt value for platform ports as it | |
462 | * couldn't be done earlier before interrupt maps have been parsed. It | |
463 | * also "corrects" the IO address for PIO ports for the same reason, | |
464 | * since earlier, the PHBs virtual IO space wasn't assigned yet. It then | |
465 | * registers all those platform ports for use by the 8250 driver when it | |
466 | * finally loads. | |
467 | */ | |
468 | static int __init serial_dev_init(void) | |
469 | { | |
470 | int i; | |
471 | ||
472 | if (legacy_serial_count == 0) | |
473 | return -ENODEV; | |
474 | ||
475 | /* | |
476 | * Before we register the platfrom serial devices, we need | |
477 | * to fixup their interrutps and their IO ports. | |
478 | */ | |
479 | DBG("Fixing serial ports interrupts and IO ports ...\n"); | |
480 | ||
481 | for (i = 0; i < legacy_serial_count; i++) { | |
482 | struct plat_serial8250_port *port = &legacy_serial_ports[i]; | |
483 | struct device_node *np = legacy_serial_infos[i].np; | |
484 | ||
485 | if (port->irq == NO_IRQ) | |
486 | fixup_port_irq(i, np, port); | |
487 | if (port->iotype == UPIO_PORT) | |
488 | fixup_port_pio(i, np, port); | |
be9633e9 | 489 | if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) |
8dacaedf | 490 | fixup_port_mmio(i, np, port); |
463ce0e1 BH |
491 | } |
492 | ||
493 | DBG("Registering platform serial ports\n"); | |
494 | ||
495 | return platform_device_register(&serial_device); | |
496 | } | |
ee56c474 | 497 | device_initcall(serial_dev_init); |
463ce0e1 BH |
498 | |
499 | ||
500 | /* | |
501 | * This is called very early, as part of console_init() (typically just after | |
502 | * time_init()). This function is respondible for trying to find a good | |
503 | * default console on serial ports. It tries to match the open firmware | |
504 | * default output with one of the available serial console drivers, either | |
505 | * one of the platform serial ports that have been probed earlier by | |
506 | * find_legacy_serial_ports() or some more platform specific ones. | |
507 | */ | |
508 | static int __init check_legacy_serial_console(void) | |
509 | { | |
510 | struct device_node *prom_stdout = NULL; | |
511 | int speed = 0, offset = 0; | |
a7f67bdf JK |
512 | const char *name; |
513 | const u32 *spd; | |
463ce0e1 BH |
514 | |
515 | DBG(" -> check_legacy_serial_console()\n"); | |
516 | ||
517 | /* The user has requested a console so this is already set up. */ | |
b8757b21 | 518 | if (strstr(boot_command_line, "console=")) { |
463ce0e1 BH |
519 | DBG(" console was specified !\n"); |
520 | return -EBUSY; | |
521 | } | |
522 | ||
523 | if (!of_chosen) { | |
524 | DBG(" of_chosen is NULL !\n"); | |
525 | return -ENODEV; | |
526 | } | |
b580d46c KG |
527 | |
528 | if (legacy_serial_console < 0) { | |
529 | DBG(" legacy_serial_console not found !\n"); | |
530 | return -ENODEV; | |
531 | } | |
463ce0e1 BH |
532 | /* We are getting a weird phandle from OF ... */ |
533 | /* ... So use the full path instead */ | |
e2eb6392 | 534 | name = of_get_property(of_chosen, "linux,stdout-path", NULL); |
463ce0e1 BH |
535 | if (name == NULL) { |
536 | DBG(" no linux,stdout-path !\n"); | |
537 | return -ENODEV; | |
538 | } | |
539 | prom_stdout = of_find_node_by_path(name); | |
540 | if (!prom_stdout) { | |
541 | DBG(" can't find stdout package %s !\n", name); | |
542 | return -ENODEV; | |
543 | } | |
544 | DBG("stdout is %s\n", prom_stdout->full_name); | |
545 | ||
e2eb6392 | 546 | name = of_get_property(prom_stdout, "name", NULL); |
463ce0e1 BH |
547 | if (!name) { |
548 | DBG(" stdout package has no name !\n"); | |
549 | goto not_found; | |
550 | } | |
e2eb6392 | 551 | spd = of_get_property(prom_stdout, "current-speed", NULL); |
463ce0e1 BH |
552 | if (spd) |
553 | speed = *spd; | |
554 | ||
555 | if (0) | |
556 | ; | |
557 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
558 | else if (strcmp(name, "serial") == 0) { | |
559 | int i; | |
560 | /* Look for it in probed array */ | |
561 | for (i = 0; i < legacy_serial_count; i++) { | |
562 | if (prom_stdout != legacy_serial_infos[i].np) | |
563 | continue; | |
564 | offset = i; | |
565 | speed = legacy_serial_infos[i].speed; | |
566 | break; | |
567 | } | |
568 | if (i >= legacy_serial_count) | |
569 | goto not_found; | |
570 | } | |
571 | #endif /* CONFIG_SERIAL_8250_CONSOLE */ | |
572 | #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE | |
573 | else if (strcmp(name, "ch-a") == 0) | |
574 | offset = 0; | |
575 | else if (strcmp(name, "ch-b") == 0) | |
576 | offset = 1; | |
577 | #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ | |
578 | else | |
579 | goto not_found; | |
580 | of_node_put(prom_stdout); | |
581 | ||
582 | DBG("Found serial console at ttyS%d\n", offset); | |
583 | ||
584 | if (speed) { | |
585 | static char __initdata opt[16]; | |
586 | sprintf(opt, "%d", speed); | |
587 | return add_preferred_console("ttyS", offset, opt); | |
588 | } else | |
589 | return add_preferred_console("ttyS", offset, NULL); | |
590 | ||
591 | not_found: | |
592 | DBG("No preferred console found !\n"); | |
593 | of_node_put(prom_stdout); | |
594 | return -ENODEV; | |
595 | } | |
596 | console_initcall(check_legacy_serial_console); | |
597 |