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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> | |
22ae782f | 7 | #include <linux/of_address.h> |
1a7507c7 | 8 | #include <linux/of_device.h> |
463ce0e1 BH |
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 | ||
27 | static struct plat_serial8250_port | |
28 | legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; | |
29 | static struct legacy_serial_info { | |
30 | struct device_node *np; | |
31 | unsigned int speed; | |
32 | unsigned int clock; | |
0ebfff14 | 33 | int irq_check_parent; |
463ce0e1 BH |
34 | phys_addr_t taddr; |
35 | } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; | |
1a7507c7 | 36 | |
3bc5ab9b | 37 | static struct __initdata of_device_id legacy_serial_parents[] = { |
1a7507c7 PG |
38 | {.type = "soc",}, |
39 | {.type = "tsi-bridge",}, | |
f5903ede ME |
40 | {.type = "opb", }, |
41 | {.compatible = "ibm,opb",}, | |
1a7507c7 PG |
42 | {.compatible = "simple-bus",}, |
43 | {.compatible = "wrs,epld-localbus",}, | |
3bc5ab9b | 44 | {}, |
1a7507c7 PG |
45 | }; |
46 | ||
463ce0e1 BH |
47 | static unsigned int legacy_serial_count; |
48 | static int legacy_serial_console = -1; | |
49 | ||
50 | static int __init add_legacy_port(struct device_node *np, int want_index, | |
51 | int iotype, phys_addr_t base, | |
b580d46c | 52 | phys_addr_t taddr, unsigned long irq, |
0ebfff14 | 53 | upf_t flags, int irq_check_parent) |
463ce0e1 | 54 | { |
a7f67bdf JK |
55 | const u32 *clk, *spd; |
56 | u32 clock = BASE_BAUD * 16; | |
463ce0e1 BH |
57 | int index; |
58 | ||
59 | /* get clock freq. if present */ | |
e2eb6392 | 60 | clk = of_get_property(np, "clock-frequency", NULL); |
31df1678 DW |
61 | if (clk && *clk) |
62 | clock = *clk; | |
463ce0e1 BH |
63 | |
64 | /* get default speed if present */ | |
e2eb6392 | 65 | spd = of_get_property(np, "current-speed", NULL); |
463ce0e1 BH |
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) { | |
0ebfff14 | 86 | printk(KERN_DEBUG "Moved legacy port %d -> %d\n", |
463ce0e1 BH |
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 { | |
0ebfff14 | 94 | printk(KERN_DEBUG "Replacing legacy port %d\n", index); |
463ce0e1 BH |
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 | |
8dacaedf | 104 | legacy_serial_ports[index].mapbase = base; |
463ce0e1 BH |
105 | legacy_serial_ports[index].iotype = iotype; |
106 | legacy_serial_ports[index].uartclk = clock; | |
107 | legacy_serial_ports[index].irq = irq; | |
b580d46c | 108 | legacy_serial_ports[index].flags = flags; |
463ce0e1 BH |
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; | |
0ebfff14 | 113 | legacy_serial_infos[index].irq_check_parent = irq_check_parent; |
463ce0e1 | 114 | |
0ebfff14 | 115 | printk(KERN_DEBUG "Found legacy serial port %d for %s\n", |
463ce0e1 | 116 | index, np->full_name); |
0ebfff14 | 117 | printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", |
463ce0e1 BH |
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 | ||
b580d46c KG |
126 | static int __init add_legacy_soc_port(struct device_node *np, |
127 | struct device_node *soc_dev) | |
128 | { | |
f704b8d1 | 129 | u64 addr; |
a7f67bdf | 130 | const u32 *addrp; |
abb4a239 DG |
131 | upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ |
132 | | UPF_FIXED_PORT; | |
be9633e9 | 133 | struct device_node *tsi = of_get_parent(np); |
b580d46c KG |
134 | |
135 | /* We only support ports that have a clock frequency properly | |
136 | * encoded in the device-tree. | |
137 | */ | |
e2eb6392 | 138 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
b580d46c KG |
139 | return -1; |
140 | ||
1e6d1f26 JL |
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 | ||
8d38a5b2 | 146 | /* if rtas uses this device, don't try to use it as well */ |
e2eb6392 | 147 | if (of_get_property(np, "used-by-rtas", NULL) != NULL) |
8d38a5b2 AB |
148 | return -1; |
149 | ||
b580d46c KG |
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); | |
7c6efda5 BH |
156 | if (addr == OF_BAD_ADDR) |
157 | return -1; | |
b580d46c KG |
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 | */ | |
be9633e9 ZR |
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); | |
b580d46c KG |
166 | } |
167 | ||
463ce0e1 | 168 | static int __init add_legacy_isa_port(struct device_node *np, |
017e0fad | 169 | struct device_node *isa_brg) |
463ce0e1 | 170 | { |
a7f67bdf JK |
171 | const u32 *reg; |
172 | const char *typep; | |
463ce0e1 | 173 | int index = -1; |
f704b8d1 | 174 | u64 taddr; |
463ce0e1 | 175 | |
7c6efda5 BH |
176 | DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); |
177 | ||
463ce0e1 | 178 | /* Get the ISA port number */ |
e2eb6392 | 179 | reg = of_get_property(np, "reg", NULL); |
463ce0e1 BH |
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 | */ | |
e2eb6392 | 190 | typep = of_get_property(np, "ibm,aix-loc", NULL); |
463ce0e1 BH |
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 | ||
f704b8d1 BH |
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 | */ | |
463ce0e1 | 200 | taddr = of_translate_address(np, reg); |
7c6efda5 | 201 | if (taddr == OF_BAD_ADDR) |
f704b8d1 | 202 | taddr = 0; |
463ce0e1 BH |
203 | |
204 | /* Add port, irq will be dealt with later */ | |
7c6efda5 | 205 | return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, |
0ebfff14 | 206 | NO_IRQ, UPF_BOOT_AUTOCONF, 0); |
463ce0e1 BH |
207 | |
208 | } | |
209 | ||
017e0fad | 210 | #ifdef CONFIG_PCI |
463ce0e1 BH |
211 | static int __init add_legacy_pci_port(struct device_node *np, |
212 | struct device_node *pci_dev) | |
213 | { | |
f704b8d1 | 214 | u64 addr, base; |
a7f67bdf | 215 | const u32 *addrp; |
d2dd482b | 216 | unsigned int flags; |
8dacaedf | 217 | int iotype, index = -1, lindex = 0; |
463ce0e1 | 218 | |
7c6efda5 BH |
219 | DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); |
220 | ||
463ce0e1 BH |
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 | |
8dacaedf BH |
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 | |
463ce0e1 | 227 | */ |
e2eb6392 | 228 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
463ce0e1 | 229 | return -1; |
463ce0e1 BH |
230 | |
231 | /* Get the PCI address. Assume BAR 0 */ | |
d2dd482b | 232 | addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); |
463ce0e1 BH |
233 | if (addrp == NULL) |
234 | return -1; | |
235 | ||
236 | /* We only support BAR 0 for now */ | |
d2dd482b | 237 | iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; |
463ce0e1 | 238 | addr = of_translate_address(pci_dev, addrp); |
7c6efda5 BH |
239 | if (addr == OF_BAD_ADDR) |
240 | return -1; | |
463ce0e1 BH |
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) { | |
e2eb6392 | 254 | const u32 *reg = of_get_property(np, "reg", NULL); |
463ce0e1 | 255 | if (reg && (*reg < 4)) |
8dacaedf BH |
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 | */ | |
55b61fec SR |
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")) { | |
8dacaedf BH |
268 | addr += 0x200 * lindex; |
269 | base += 0x200 * lindex; | |
270 | } else { | |
271 | addr += 8 * lindex; | |
272 | base += 8 * lindex; | |
463ce0e1 BH |
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 | */ | |
0ebfff14 BH |
278 | return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, |
279 | UPF_BOOT_AUTOCONF, np != pci_dev); | |
463ce0e1 | 280 | } |
017e0fad | 281 | #endif |
463ce0e1 | 282 | |
37a801c7 MN |
283 | static 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 | ||
463ce0e1 BH |
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 | */ | |
309 | void __init find_legacy_serial_ports(void) | |
310 | { | |
b580d46c | 311 | struct device_node *np, *stdout = NULL; |
a7f67bdf | 312 | const char *path; |
463ce0e1 BH |
313 | int index; |
314 | ||
315 | DBG(" -> find_legacy_serial_port()\n"); | |
316 | ||
317 | /* Now find out if one of these is out firmware console */ | |
e2eb6392 | 318 | path = of_get_property(of_chosen, "linux,stdout-path", NULL); |
b580d46c KG |
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 { | |
463ce0e1 | 324 | DBG(" no linux,stdout-path !\n"); |
463ce0e1 | 325 | } |
b580d46c | 326 | |
1a7507c7 | 327 | /* Iterate over all the 16550 ports, looking for known parents */ |
3329c0d1 | 328 | for_each_compatible_node(np, "serial", "ns16550") { |
1a7507c7 PG |
329 | struct device_node *parent = of_get_parent(np); |
330 | if (!parent) | |
331 | continue; | |
3bc5ab9b | 332 | if (of_match_node(legacy_serial_parents, parent) != NULL) { |
b580d46c KG |
333 | index = add_legacy_soc_port(np, np); |
334 | if (index >= 0 && np == stdout) | |
335 | legacy_serial_console = index; | |
336 | } | |
1a7507c7 | 337 | of_node_put(parent); |
463ce0e1 BH |
338 | } |
339 | ||
1a7507c7 | 340 | /* Next, fill our array with ISA ports */ |
3329c0d1 | 341 | for_each_node_by_type(np, "serial") { |
463ce0e1 BH |
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 | ||
017e0fad | 351 | #ifdef CONFIG_PCI |
463ce0e1 BH |
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 | */ | |
55b61fec SR |
366 | if (of_device_is_compatible(np, "pciclass,0700") || |
367 | of_device_is_compatible(np, "pciclass,070002")) | |
463ce0e1 | 368 | pci = np; |
55b61fec SR |
369 | else if (of_device_is_compatible(parent, "pciclass,0700") || |
370 | of_device_is_compatible(parent, "pciclass,070002")) | |
463ce0e1 BH |
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 | } | |
017e0fad | 381 | #endif |
463ce0e1 BH |
382 | |
383 | DBG("legacy_serial_console = %d\n", legacy_serial_console); | |
37a801c7 MN |
384 | if (legacy_serial_console >= 0) |
385 | setup_legacy_serial_console(legacy_serial_console); | |
463ce0e1 BH |
386 | DBG(" <- find_legacy_serial_port()\n"); |
387 | } | |
388 | ||
389 | static struct platform_device serial_device = { | |
390 | .name = "serial8250", | |
391 | .id = PLAT8250_DEV_PLATFORM, | |
392 | .dev = { | |
393 | .platform_data = legacy_serial_ports, | |
394 | }, | |
395 | }; | |
396 | ||
397 | static void __init fixup_port_irq(int index, | |
398 | struct device_node *np, | |
399 | struct plat_serial8250_port *port) | |
400 | { | |
0ebfff14 BH |
401 | unsigned int virq; |
402 | ||
463ce0e1 BH |
403 | DBG("fixup_port_irq(%d)\n", index); |
404 | ||
0ebfff14 BH |
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); | |
463ce0e1 | 412 | } |
0ebfff14 | 413 | if (virq == NO_IRQ) |
463ce0e1 BH |
414 | return; |
415 | ||
0ebfff14 | 416 | port->irq = virq; |
463ce0e1 BH |
417 | } |
418 | ||
419 | static void __init fixup_port_pio(int index, | |
420 | struct device_node *np, | |
421 | struct plat_serial8250_port *port) | |
422 | { | |
017e0fad | 423 | #ifdef CONFIG_PCI |
463ce0e1 BH |
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 | } | |
017e0fad | 440 | #endif |
463ce0e1 BH |
441 | } |
442 | ||
8dacaedf BH |
443 | static 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 | ||
463ce0e1 BH |
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 | */ | |
465 | static int __init serial_dev_init(void) | |
466 | { | |
467 | int i; | |
468 | ||
469 | if (legacy_serial_count == 0) | |
470 | return -ENODEV; | |
471 | ||
472 | /* | |
947af294 | 473 | * Before we register the platform serial devices, we need |
00d70419 | 474 | * to fixup their interrupts and their IO ports. |
463ce0e1 BH |
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); | |
be9633e9 | 486 | if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) |
8dacaedf | 487 | fixup_port_mmio(i, np, port); |
463ce0e1 BH |
488 | } |
489 | ||
490 | DBG("Registering platform serial ports\n"); | |
491 | ||
492 | return platform_device_register(&serial_device); | |
493 | } | |
ee56c474 | 494 | device_initcall(serial_dev_init); |
463ce0e1 BH |
495 | |
496 | ||
025d7917 | 497 | #ifdef CONFIG_SERIAL_8250_CONSOLE |
463ce0e1 BH |
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 | |
025d7917 BH |
502 | * default output with one of the available serial console drivers that have |
503 | * been probed earlier by find_legacy_serial_ports() | |
463ce0e1 BH |
504 | */ |
505 | static int __init check_legacy_serial_console(void) | |
506 | { | |
507 | struct device_node *prom_stdout = NULL; | |
025d7917 | 508 | int i, speed = 0, offset = 0; |
a7f67bdf JK |
509 | const char *name; |
510 | const u32 *spd; | |
463ce0e1 BH |
511 | |
512 | DBG(" -> check_legacy_serial_console()\n"); | |
513 | ||
514 | /* The user has requested a console so this is already set up. */ | |
b8757b21 | 515 | if (strstr(boot_command_line, "console=")) { |
463ce0e1 BH |
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 | } | |
b580d46c KG |
524 | |
525 | if (legacy_serial_console < 0) { | |
526 | DBG(" legacy_serial_console not found !\n"); | |
527 | return -ENODEV; | |
528 | } | |
463ce0e1 BH |
529 | /* We are getting a weird phandle from OF ... */ |
530 | /* ... So use the full path instead */ | |
e2eb6392 | 531 | name = of_get_property(of_chosen, "linux,stdout-path", NULL); |
463ce0e1 BH |
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 | ||
e2eb6392 | 543 | name = of_get_property(prom_stdout, "name", NULL); |
463ce0e1 BH |
544 | if (!name) { |
545 | DBG(" stdout package has no name !\n"); | |
546 | goto not_found; | |
547 | } | |
e2eb6392 | 548 | spd = of_get_property(prom_stdout, "current-speed", NULL); |
463ce0e1 BH |
549 | if (spd) |
550 | speed = *spd; | |
551 | ||
025d7917 BH |
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; | |
463ce0e1 | 562 | } |
025d7917 | 563 | if (i >= legacy_serial_count) |
463ce0e1 | 564 | goto not_found; |
025d7917 | 565 | |
463ce0e1 BH |
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 | } | |
582 | console_initcall(check_legacy_serial_console); | |
583 | ||
025d7917 | 584 | #endif /* CONFIG_SERIAL_8250_CONSOLE */ |