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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> |
7df5659e | 9 | #include <linux/serial_reg.h> |
463ce0e1 BH |
10 | #include <asm/io.h> |
11 | #include <asm/mmu.h> | |
12 | #include <asm/prom.h> | |
13 | #include <asm/serial.h> | |
14 | #include <asm/udbg.h> | |
15 | #include <asm/pci-bridge.h> | |
16 | #include <asm/ppc-pci.h> | |
17 | ||
18 | #undef DEBUG | |
19 | ||
20 | #ifdef DEBUG | |
21 | #define DBG(fmt...) do { printk(fmt); } while(0) | |
22 | #else | |
23 | #define DBG(fmt...) do { } while(0) | |
24 | #endif | |
25 | ||
26 | #define MAX_LEGACY_SERIAL_PORTS 8 | |
27 | ||
28 | static struct plat_serial8250_port | |
29 | legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; | |
30 | static struct legacy_serial_info { | |
31 | struct device_node *np; | |
32 | unsigned int speed; | |
33 | unsigned int clock; | |
0ebfff14 | 34 | int irq_check_parent; |
463ce0e1 BH |
35 | phys_addr_t taddr; |
36 | } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; | |
1a7507c7 | 37 | |
3bc5ab9b | 38 | static struct __initdata of_device_id legacy_serial_parents[] = { |
1a7507c7 PG |
39 | {.type = "soc",}, |
40 | {.type = "tsi-bridge",}, | |
f5903ede ME |
41 | {.type = "opb", }, |
42 | {.compatible = "ibm,opb",}, | |
1a7507c7 PG |
43 | {.compatible = "simple-bus",}, |
44 | {.compatible = "wrs,epld-localbus",}, | |
3bc5ab9b | 45 | {}, |
1a7507c7 PG |
46 | }; |
47 | ||
463ce0e1 BH |
48 | static unsigned int legacy_serial_count; |
49 | static int legacy_serial_console = -1; | |
50 | ||
7df5659e AB |
51 | static unsigned int tsi_serial_in(struct uart_port *p, int offset) |
52 | { | |
53 | unsigned int tmp; | |
54 | offset = offset << p->regshift; | |
55 | if (offset == UART_IIR) { | |
56 | tmp = readl(p->membase + (UART_IIR & ~3)); | |
57 | return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */ | |
58 | } else | |
59 | return readb(p->membase + offset); | |
60 | } | |
61 | ||
62 | static void tsi_serial_out(struct uart_port *p, int offset, int value) | |
63 | { | |
64 | offset = offset << p->regshift; | |
65 | if (!((offset == UART_IER) && (value & UART_IER_UUE))) | |
66 | writeb(value, p->membase + offset); | |
67 | } | |
68 | ||
463ce0e1 BH |
69 | static int __init add_legacy_port(struct device_node *np, int want_index, |
70 | int iotype, phys_addr_t base, | |
b580d46c | 71 | phys_addr_t taddr, unsigned long irq, |
0ebfff14 | 72 | upf_t flags, int irq_check_parent) |
463ce0e1 | 73 | { |
f14362d1 | 74 | const __be32 *clk, *spd; |
a7f67bdf | 75 | u32 clock = BASE_BAUD * 16; |
463ce0e1 BH |
76 | int index; |
77 | ||
78 | /* get clock freq. if present */ | |
e2eb6392 | 79 | clk = of_get_property(np, "clock-frequency", NULL); |
31df1678 | 80 | if (clk && *clk) |
f14362d1 | 81 | clock = be32_to_cpup(clk); |
463ce0e1 BH |
82 | |
83 | /* get default speed if present */ | |
e2eb6392 | 84 | spd = of_get_property(np, "current-speed", NULL); |
463ce0e1 BH |
85 | |
86 | /* If we have a location index, then try to use it */ | |
87 | if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) | |
88 | index = want_index; | |
89 | else | |
90 | index = legacy_serial_count; | |
91 | ||
92 | /* if our index is still out of range, that mean that | |
93 | * array is full, we could scan for a free slot but that | |
94 | * make little sense to bother, just skip the port | |
95 | */ | |
96 | if (index >= MAX_LEGACY_SERIAL_PORTS) | |
97 | return -1; | |
98 | if (index >= legacy_serial_count) | |
99 | legacy_serial_count = index + 1; | |
100 | ||
101 | /* Check if there is a port who already claimed our slot */ | |
b0d436c7 | 102 | if (legacy_serial_infos[index].np != NULL) { |
463ce0e1 BH |
103 | /* if we still have some room, move it, else override */ |
104 | if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { | |
0ebfff14 | 105 | printk(KERN_DEBUG "Moved legacy port %d -> %d\n", |
463ce0e1 BH |
106 | index, legacy_serial_count); |
107 | legacy_serial_ports[legacy_serial_count] = | |
108 | legacy_serial_ports[index]; | |
109 | legacy_serial_infos[legacy_serial_count] = | |
110 | legacy_serial_infos[index]; | |
111 | legacy_serial_count++; | |
112 | } else { | |
0ebfff14 | 113 | printk(KERN_DEBUG "Replacing legacy port %d\n", index); |
463ce0e1 BH |
114 | } |
115 | } | |
116 | ||
117 | /* Now fill the entry */ | |
118 | memset(&legacy_serial_ports[index], 0, | |
119 | sizeof(struct plat_serial8250_port)); | |
120 | if (iotype == UPIO_PORT) | |
121 | legacy_serial_ports[index].iobase = base; | |
122 | else | |
8dacaedf | 123 | legacy_serial_ports[index].mapbase = base; |
7df5659e | 124 | |
463ce0e1 BH |
125 | legacy_serial_ports[index].iotype = iotype; |
126 | legacy_serial_ports[index].uartclk = clock; | |
127 | legacy_serial_ports[index].irq = irq; | |
b580d46c | 128 | legacy_serial_ports[index].flags = flags; |
463ce0e1 BH |
129 | legacy_serial_infos[index].taddr = taddr; |
130 | legacy_serial_infos[index].np = of_node_get(np); | |
131 | legacy_serial_infos[index].clock = clock; | |
f14362d1 | 132 | legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0; |
0ebfff14 | 133 | legacy_serial_infos[index].irq_check_parent = irq_check_parent; |
463ce0e1 | 134 | |
7df5659e AB |
135 | if (iotype == UPIO_TSI) { |
136 | legacy_serial_ports[index].serial_in = tsi_serial_in; | |
137 | legacy_serial_ports[index].serial_out = tsi_serial_out; | |
138 | } | |
139 | ||
0ebfff14 | 140 | printk(KERN_DEBUG "Found legacy serial port %d for %s\n", |
463ce0e1 | 141 | index, np->full_name); |
0ebfff14 | 142 | printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", |
463ce0e1 BH |
143 | (iotype == UPIO_PORT) ? "port" : "mem", |
144 | (unsigned long long)base, (unsigned long long)taddr, irq, | |
145 | legacy_serial_ports[index].uartclk, | |
146 | legacy_serial_infos[index].speed); | |
147 | ||
148 | return index; | |
149 | } | |
150 | ||
b580d46c KG |
151 | static int __init add_legacy_soc_port(struct device_node *np, |
152 | struct device_node *soc_dev) | |
153 | { | |
f704b8d1 | 154 | u64 addr; |
a7f67bdf | 155 | const u32 *addrp; |
abb4a239 DG |
156 | upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ |
157 | | UPF_FIXED_PORT; | |
be9633e9 | 158 | struct device_node *tsi = of_get_parent(np); |
b580d46c KG |
159 | |
160 | /* We only support ports that have a clock frequency properly | |
161 | * encoded in the device-tree. | |
162 | */ | |
e2eb6392 | 163 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
b580d46c KG |
164 | return -1; |
165 | ||
1e6d1f26 JL |
166 | /* if reg-shift or offset, don't try to use it */ |
167 | if ((of_get_property(np, "reg-shift", NULL) != NULL) || | |
168 | (of_get_property(np, "reg-offset", NULL) != NULL)) | |
169 | return -1; | |
170 | ||
8d38a5b2 | 171 | /* if rtas uses this device, don't try to use it as well */ |
e2eb6392 | 172 | if (of_get_property(np, "used-by-rtas", NULL) != NULL) |
8d38a5b2 AB |
173 | return -1; |
174 | ||
b580d46c KG |
175 | /* Get the address */ |
176 | addrp = of_get_address(soc_dev, 0, NULL, NULL); | |
177 | if (addrp == NULL) | |
178 | return -1; | |
179 | ||
180 | addr = of_translate_address(soc_dev, addrp); | |
7c6efda5 BH |
181 | if (addr == OF_BAD_ADDR) |
182 | return -1; | |
b580d46c KG |
183 | |
184 | /* Add port, irq will be dealt with later. We passed a translated | |
185 | * IO port value. It will be fixed up later along with the irq | |
186 | */ | |
be9633e9 ZR |
187 | if (tsi && !strcmp(tsi->type, "tsi-bridge")) |
188 | return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); | |
189 | else | |
190 | return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); | |
b580d46c KG |
191 | } |
192 | ||
463ce0e1 | 193 | static int __init add_legacy_isa_port(struct device_node *np, |
017e0fad | 194 | struct device_node *isa_brg) |
463ce0e1 | 195 | { |
f14362d1 | 196 | const __be32 *reg; |
a7f67bdf | 197 | const char *typep; |
463ce0e1 | 198 | int index = -1; |
f704b8d1 | 199 | u64 taddr; |
463ce0e1 | 200 | |
7c6efda5 BH |
201 | DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); |
202 | ||
463ce0e1 | 203 | /* Get the ISA port number */ |
e2eb6392 | 204 | reg = of_get_property(np, "reg", NULL); |
463ce0e1 BH |
205 | if (reg == NULL) |
206 | return -1; | |
207 | ||
208 | /* Verify it's an IO port, we don't support anything else */ | |
f14362d1 | 209 | if (!(be32_to_cpu(reg[0]) & 0x00000001)) |
463ce0e1 BH |
210 | return -1; |
211 | ||
212 | /* Now look for an "ibm,aix-loc" property that gives us ordering | |
213 | * if any... | |
214 | */ | |
e2eb6392 | 215 | typep = of_get_property(np, "ibm,aix-loc", NULL); |
463ce0e1 BH |
216 | |
217 | /* If we have a location index, then use it */ | |
218 | if (typep && *typep == 'S') | |
219 | index = simple_strtol(typep+1, NULL, 0) - 1; | |
220 | ||
f704b8d1 BH |
221 | /* Translate ISA address. If it fails, we still register the port |
222 | * with no translated address so that it can be picked up as an IO | |
223 | * port later by the serial driver | |
224 | */ | |
463ce0e1 | 225 | taddr = of_translate_address(np, reg); |
7c6efda5 | 226 | if (taddr == OF_BAD_ADDR) |
f704b8d1 | 227 | taddr = 0; |
463ce0e1 BH |
228 | |
229 | /* Add port, irq will be dealt with later */ | |
f14362d1 | 230 | return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]), taddr, |
0ebfff14 | 231 | NO_IRQ, UPF_BOOT_AUTOCONF, 0); |
463ce0e1 BH |
232 | |
233 | } | |
234 | ||
017e0fad | 235 | #ifdef CONFIG_PCI |
463ce0e1 BH |
236 | static int __init add_legacy_pci_port(struct device_node *np, |
237 | struct device_node *pci_dev) | |
238 | { | |
f704b8d1 | 239 | u64 addr, base; |
a7f67bdf | 240 | const u32 *addrp; |
d2dd482b | 241 | unsigned int flags; |
8dacaedf | 242 | int iotype, index = -1, lindex = 0; |
463ce0e1 | 243 | |
7c6efda5 BH |
244 | DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); |
245 | ||
463ce0e1 BH |
246 | /* We only support ports that have a clock frequency properly |
247 | * encoded in the device-tree (that is have an fcode). Anything | |
248 | * else can't be used that early and will be normally probed by | |
8dacaedf BH |
249 | * the generic 8250_pci driver later on. The reason is that 8250 |
250 | * compatible UARTs on PCI need all sort of quirks (port offsets | |
251 | * etc...) that this code doesn't know about | |
463ce0e1 | 252 | */ |
e2eb6392 | 253 | if (of_get_property(np, "clock-frequency", NULL) == NULL) |
463ce0e1 | 254 | return -1; |
463ce0e1 BH |
255 | |
256 | /* Get the PCI address. Assume BAR 0 */ | |
d2dd482b | 257 | addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); |
463ce0e1 BH |
258 | if (addrp == NULL) |
259 | return -1; | |
260 | ||
261 | /* We only support BAR 0 for now */ | |
d2dd482b | 262 | iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; |
463ce0e1 | 263 | addr = of_translate_address(pci_dev, addrp); |
7c6efda5 BH |
264 | if (addr == OF_BAD_ADDR) |
265 | return -1; | |
463ce0e1 BH |
266 | |
267 | /* Set the IO base to the same as the translated address for MMIO, | |
268 | * or to the domain local IO base for PIO (it will be fixed up later) | |
269 | */ | |
270 | if (iotype == UPIO_MEM) | |
271 | base = addr; | |
272 | else | |
273 | base = addrp[2]; | |
274 | ||
275 | /* Try to guess an index... If we have subdevices of the pci dev, | |
276 | * we get to their "reg" property | |
277 | */ | |
278 | if (np != pci_dev) { | |
f14362d1 IM |
279 | const __be32 *reg = of_get_property(np, "reg", NULL); |
280 | if (reg && (be32_to_cpup(reg) < 4)) | |
281 | index = lindex = be32_to_cpup(reg); | |
8dacaedf BH |
282 | } |
283 | ||
284 | /* Local index means it's the Nth port in the PCI chip. Unfortunately | |
285 | * the offset to add here is device specific. We know about those | |
286 | * EXAR ports and we default to the most common case. If your UART | |
287 | * doesn't work for these settings, you'll have to add your own special | |
288 | * cases here | |
289 | */ | |
55b61fec SR |
290 | if (of_device_is_compatible(pci_dev, "pci13a8,152") || |
291 | of_device_is_compatible(pci_dev, "pci13a8,154") || | |
292 | of_device_is_compatible(pci_dev, "pci13a8,158")) { | |
8dacaedf BH |
293 | addr += 0x200 * lindex; |
294 | base += 0x200 * lindex; | |
295 | } else { | |
296 | addr += 8 * lindex; | |
297 | base += 8 * lindex; | |
463ce0e1 BH |
298 | } |
299 | ||
300 | /* Add port, irq will be dealt with later. We passed a translated | |
301 | * IO port value. It will be fixed up later along with the irq | |
302 | */ | |
0ebfff14 BH |
303 | return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, |
304 | UPF_BOOT_AUTOCONF, np != pci_dev); | |
463ce0e1 | 305 | } |
017e0fad | 306 | #endif |
463ce0e1 | 307 | |
37a801c7 MN |
308 | static void __init setup_legacy_serial_console(int console) |
309 | { | |
310 | struct legacy_serial_info *info = | |
311 | &legacy_serial_infos[console]; | |
312 | void __iomem *addr; | |
313 | ||
314 | if (info->taddr == 0) | |
315 | return; | |
316 | addr = ioremap(info->taddr, 0x1000); | |
317 | if (addr == NULL) | |
318 | return; | |
319 | if (info->speed == 0) | |
320 | info->speed = udbg_probe_uart_speed(addr, info->clock); | |
321 | DBG("default console speed = %d\n", info->speed); | |
322 | udbg_init_uart(addr, info->speed, info->clock); | |
323 | } | |
324 | ||
463ce0e1 BH |
325 | /* |
326 | * This is called very early, as part of setup_system() or eventually | |
327 | * setup_arch(), basically before anything else in this file. This function | |
328 | * will try to build a list of all the available 8250-compatible serial ports | |
329 | * in the machine using the Open Firmware device-tree. It currently only deals | |
330 | * with ISA and PCI busses but could be extended. It allows a very early boot | |
331 | * console to be initialized, that list is also used later to provide 8250 with | |
332 | * the machine non-PCI ports and to properly pick the default console port | |
333 | */ | |
334 | void __init find_legacy_serial_ports(void) | |
335 | { | |
b580d46c | 336 | struct device_node *np, *stdout = NULL; |
a7f67bdf | 337 | const char *path; |
463ce0e1 BH |
338 | int index; |
339 | ||
340 | DBG(" -> find_legacy_serial_port()\n"); | |
341 | ||
342 | /* Now find out if one of these is out firmware console */ | |
e2eb6392 | 343 | path = of_get_property(of_chosen, "linux,stdout-path", NULL); |
b580d46c KG |
344 | if (path != NULL) { |
345 | stdout = of_find_node_by_path(path); | |
346 | if (stdout) | |
347 | DBG("stdout is %s\n", stdout->full_name); | |
348 | } else { | |
463ce0e1 | 349 | DBG(" no linux,stdout-path !\n"); |
463ce0e1 | 350 | } |
b580d46c | 351 | |
1a7507c7 | 352 | /* Iterate over all the 16550 ports, looking for known parents */ |
3329c0d1 | 353 | for_each_compatible_node(np, "serial", "ns16550") { |
1a7507c7 PG |
354 | struct device_node *parent = of_get_parent(np); |
355 | if (!parent) | |
356 | continue; | |
3bc5ab9b | 357 | if (of_match_node(legacy_serial_parents, parent) != NULL) { |
07d9fce2 PK |
358 | if (of_device_is_available(np)) { |
359 | index = add_legacy_soc_port(np, np); | |
360 | if (index >= 0 && np == stdout) | |
361 | legacy_serial_console = index; | |
362 | } | |
b580d46c | 363 | } |
1a7507c7 | 364 | of_node_put(parent); |
463ce0e1 BH |
365 | } |
366 | ||
1a7507c7 | 367 | /* Next, fill our array with ISA ports */ |
3329c0d1 | 368 | for_each_node_by_type(np, "serial") { |
463ce0e1 BH |
369 | struct device_node *isa = of_get_parent(np); |
370 | if (isa && !strcmp(isa->name, "isa")) { | |
371 | index = add_legacy_isa_port(np, isa); | |
372 | if (index >= 0 && np == stdout) | |
373 | legacy_serial_console = index; | |
374 | } | |
375 | of_node_put(isa); | |
376 | } | |
377 | ||
017e0fad | 378 | #ifdef CONFIG_PCI |
463ce0e1 BH |
379 | /* Next, try to locate PCI ports */ |
380 | for (np = NULL; (np = of_find_all_nodes(np));) { | |
381 | struct device_node *pci, *parent = of_get_parent(np); | |
382 | if (parent && !strcmp(parent->name, "isa")) { | |
383 | of_node_put(parent); | |
384 | continue; | |
385 | } | |
386 | if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { | |
387 | of_node_put(parent); | |
388 | continue; | |
389 | } | |
48fc7f7e | 390 | /* Check for known pciclass, and also check whether we have |
463ce0e1 BH |
391 | * a device with child nodes for ports or not |
392 | */ | |
55b61fec SR |
393 | if (of_device_is_compatible(np, "pciclass,0700") || |
394 | of_device_is_compatible(np, "pciclass,070002")) | |
463ce0e1 | 395 | pci = np; |
55b61fec SR |
396 | else if (of_device_is_compatible(parent, "pciclass,0700") || |
397 | of_device_is_compatible(parent, "pciclass,070002")) | |
463ce0e1 BH |
398 | pci = parent; |
399 | else { | |
400 | of_node_put(parent); | |
401 | continue; | |
402 | } | |
403 | index = add_legacy_pci_port(np, pci); | |
404 | if (index >= 0 && np == stdout) | |
405 | legacy_serial_console = index; | |
406 | of_node_put(parent); | |
407 | } | |
017e0fad | 408 | #endif |
463ce0e1 BH |
409 | |
410 | DBG("legacy_serial_console = %d\n", legacy_serial_console); | |
37a801c7 MN |
411 | if (legacy_serial_console >= 0) |
412 | setup_legacy_serial_console(legacy_serial_console); | |
463ce0e1 BH |
413 | DBG(" <- find_legacy_serial_port()\n"); |
414 | } | |
415 | ||
416 | static struct platform_device serial_device = { | |
417 | .name = "serial8250", | |
418 | .id = PLAT8250_DEV_PLATFORM, | |
419 | .dev = { | |
420 | .platform_data = legacy_serial_ports, | |
421 | }, | |
422 | }; | |
423 | ||
424 | static void __init fixup_port_irq(int index, | |
425 | struct device_node *np, | |
426 | struct plat_serial8250_port *port) | |
427 | { | |
0ebfff14 BH |
428 | unsigned int virq; |
429 | ||
463ce0e1 BH |
430 | DBG("fixup_port_irq(%d)\n", index); |
431 | ||
0ebfff14 BH |
432 | virq = irq_of_parse_and_map(np, 0); |
433 | if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { | |
434 | np = of_get_parent(np); | |
435 | if (np == NULL) | |
436 | return; | |
437 | virq = irq_of_parse_and_map(np, 0); | |
438 | of_node_put(np); | |
463ce0e1 | 439 | } |
0ebfff14 | 440 | if (virq == NO_IRQ) |
463ce0e1 BH |
441 | return; |
442 | ||
0ebfff14 | 443 | port->irq = virq; |
9deaa53a | 444 | |
3493c853 | 445 | #ifdef CONFIG_SERIAL_8250_FSL |
9deaa53a PG |
446 | if (of_device_is_compatible(np, "fsl,ns16550")) |
447 | port->handle_irq = fsl8250_handle_irq; | |
3493c853 | 448 | #endif |
463ce0e1 BH |
449 | } |
450 | ||
451 | static void __init fixup_port_pio(int index, | |
452 | struct device_node *np, | |
453 | struct plat_serial8250_port *port) | |
454 | { | |
017e0fad | 455 | #ifdef CONFIG_PCI |
463ce0e1 BH |
456 | struct pci_controller *hose; |
457 | ||
458 | DBG("fixup_port_pio(%d)\n", index); | |
459 | ||
460 | hose = pci_find_hose_for_OF_device(np); | |
461 | if (hose) { | |
462 | unsigned long offset = (unsigned long)hose->io_base_virt - | |
463 | #ifdef CONFIG_PPC64 | |
464 | pci_io_base; | |
465 | #else | |
466 | isa_io_base; | |
467 | #endif | |
468 | DBG("port %d, IO %lx -> %lx\n", | |
469 | index, port->iobase, port->iobase + offset); | |
470 | port->iobase += offset; | |
471 | } | |
017e0fad | 472 | #endif |
463ce0e1 BH |
473 | } |
474 | ||
8dacaedf BH |
475 | static void __init fixup_port_mmio(int index, |
476 | struct device_node *np, | |
477 | struct plat_serial8250_port *port) | |
478 | { | |
479 | DBG("fixup_port_mmio(%d)\n", index); | |
480 | ||
481 | port->membase = ioremap(port->mapbase, 0x100); | |
482 | } | |
483 | ||
463ce0e1 BH |
484 | /* |
485 | * This is called as an arch initcall, hopefully before the PCI bus is | |
486 | * probed and/or the 8250 driver loaded since we need to register our | |
487 | * platform devices before 8250 PCI ones are detected as some of them | |
488 | * must properly "override" the platform ones. | |
489 | * | |
490 | * This function fixes up the interrupt value for platform ports as it | |
491 | * couldn't be done earlier before interrupt maps have been parsed. It | |
492 | * also "corrects" the IO address for PIO ports for the same reason, | |
493 | * since earlier, the PHBs virtual IO space wasn't assigned yet. It then | |
494 | * registers all those platform ports for use by the 8250 driver when it | |
495 | * finally loads. | |
496 | */ | |
497 | static int __init serial_dev_init(void) | |
498 | { | |
499 | int i; | |
500 | ||
501 | if (legacy_serial_count == 0) | |
502 | return -ENODEV; | |
503 | ||
504 | /* | |
947af294 | 505 | * Before we register the platform serial devices, we need |
00d70419 | 506 | * to fixup their interrupts and their IO ports. |
463ce0e1 BH |
507 | */ |
508 | DBG("Fixing serial ports interrupts and IO ports ...\n"); | |
509 | ||
510 | for (i = 0; i < legacy_serial_count; i++) { | |
511 | struct plat_serial8250_port *port = &legacy_serial_ports[i]; | |
512 | struct device_node *np = legacy_serial_infos[i].np; | |
513 | ||
514 | if (port->irq == NO_IRQ) | |
515 | fixup_port_irq(i, np, port); | |
516 | if (port->iotype == UPIO_PORT) | |
517 | fixup_port_pio(i, np, port); | |
be9633e9 | 518 | if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) |
8dacaedf | 519 | fixup_port_mmio(i, np, port); |
463ce0e1 BH |
520 | } |
521 | ||
522 | DBG("Registering platform serial ports\n"); | |
523 | ||
524 | return platform_device_register(&serial_device); | |
525 | } | |
ee56c474 | 526 | device_initcall(serial_dev_init); |
463ce0e1 BH |
527 | |
528 | ||
025d7917 | 529 | #ifdef CONFIG_SERIAL_8250_CONSOLE |
463ce0e1 BH |
530 | /* |
531 | * This is called very early, as part of console_init() (typically just after | |
532 | * time_init()). This function is respondible for trying to find a good | |
533 | * default console on serial ports. It tries to match the open firmware | |
025d7917 BH |
534 | * default output with one of the available serial console drivers that have |
535 | * been probed earlier by find_legacy_serial_ports() | |
463ce0e1 BH |
536 | */ |
537 | static int __init check_legacy_serial_console(void) | |
538 | { | |
539 | struct device_node *prom_stdout = NULL; | |
025d7917 | 540 | int i, speed = 0, offset = 0; |
a7f67bdf | 541 | const char *name; |
f14362d1 | 542 | const __be32 *spd; |
463ce0e1 BH |
543 | |
544 | DBG(" -> check_legacy_serial_console()\n"); | |
545 | ||
546 | /* The user has requested a console so this is already set up. */ | |
b8757b21 | 547 | if (strstr(boot_command_line, "console=")) { |
463ce0e1 BH |
548 | DBG(" console was specified !\n"); |
549 | return -EBUSY; | |
550 | } | |
551 | ||
552 | if (!of_chosen) { | |
553 | DBG(" of_chosen is NULL !\n"); | |
554 | return -ENODEV; | |
555 | } | |
b580d46c KG |
556 | |
557 | if (legacy_serial_console < 0) { | |
558 | DBG(" legacy_serial_console not found !\n"); | |
559 | return -ENODEV; | |
560 | } | |
463ce0e1 BH |
561 | /* We are getting a weird phandle from OF ... */ |
562 | /* ... So use the full path instead */ | |
e2eb6392 | 563 | name = of_get_property(of_chosen, "linux,stdout-path", NULL); |
463ce0e1 BH |
564 | if (name == NULL) { |
565 | DBG(" no linux,stdout-path !\n"); | |
566 | return -ENODEV; | |
567 | } | |
568 | prom_stdout = of_find_node_by_path(name); | |
569 | if (!prom_stdout) { | |
570 | DBG(" can't find stdout package %s !\n", name); | |
571 | return -ENODEV; | |
572 | } | |
573 | DBG("stdout is %s\n", prom_stdout->full_name); | |
574 | ||
e2eb6392 | 575 | name = of_get_property(prom_stdout, "name", NULL); |
463ce0e1 BH |
576 | if (!name) { |
577 | DBG(" stdout package has no name !\n"); | |
578 | goto not_found; | |
579 | } | |
e2eb6392 | 580 | spd = of_get_property(prom_stdout, "current-speed", NULL); |
463ce0e1 | 581 | if (spd) |
f14362d1 | 582 | speed = be32_to_cpup(spd); |
463ce0e1 | 583 | |
025d7917 BH |
584 | if (strcmp(name, "serial") != 0) |
585 | goto not_found; | |
586 | ||
587 | /* Look for it in probed array */ | |
588 | for (i = 0; i < legacy_serial_count; i++) { | |
589 | if (prom_stdout != legacy_serial_infos[i].np) | |
590 | continue; | |
591 | offset = i; | |
592 | speed = legacy_serial_infos[i].speed; | |
593 | break; | |
463ce0e1 | 594 | } |
025d7917 | 595 | if (i >= legacy_serial_count) |
463ce0e1 | 596 | goto not_found; |
025d7917 | 597 | |
463ce0e1 BH |
598 | of_node_put(prom_stdout); |
599 | ||
600 | DBG("Found serial console at ttyS%d\n", offset); | |
601 | ||
602 | if (speed) { | |
603 | static char __initdata opt[16]; | |
604 | sprintf(opt, "%d", speed); | |
605 | return add_preferred_console("ttyS", offset, opt); | |
606 | } else | |
607 | return add_preferred_console("ttyS", offset, NULL); | |
608 | ||
609 | not_found: | |
610 | DBG("No preferred console found !\n"); | |
611 | of_node_put(prom_stdout); | |
612 | return -ENODEV; | |
613 | } | |
614 | console_initcall(check_legacy_serial_console); | |
615 | ||
025d7917 | 616 | #endif /* CONFIG_SERIAL_8250_CONSOLE */ |