This source file includes following definitions.
- tsi_serial_in
- tsi_serial_out
- add_legacy_port
- add_legacy_soc_port
- add_legacy_isa_port
- add_legacy_pci_port
- setup_legacy_serial_console
- find_legacy_serial_ports
- fixup_port_irq
- fixup_port_pio
- fixup_port_mmio
- serial_dev_init
- check_legacy_serial_console
1
2 #include <linux/kernel.h>
3 #include <linux/serial.h>
4 #include <linux/serial_8250.h>
5 #include <linux/serial_core.h>
6 #include <linux/console.h>
7 #include <linux/pci.h>
8 #include <linux/of_address.h>
9 #include <linux/of_device.h>
10 #include <linux/serial_reg.h>
11 #include <asm/io.h>
12 #include <asm/mmu.h>
13 #include <asm/prom.h>
14 #include <asm/serial.h>
15 #include <asm/udbg.h>
16 #include <asm/pci-bridge.h>
17 #include <asm/ppc-pci.h>
18
19 #undef DEBUG
20
21 #ifdef DEBUG
22 #define DBG(fmt...) do { printk(fmt); } while(0)
23 #else
24 #define DBG(fmt...) do { } while(0)
25 #endif
26
27 #define MAX_LEGACY_SERIAL_PORTS 8
28
29 static struct plat_serial8250_port
30 legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
31 static struct legacy_serial_info {
32 struct device_node *np;
33 unsigned int speed;
34 unsigned int clock;
35 int irq_check_parent;
36 phys_addr_t taddr;
37 } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
38
39 static const struct of_device_id legacy_serial_parents[] __initconst = {
40 {.type = "soc",},
41 {.type = "tsi-bridge",},
42 {.type = "opb", },
43 {.compatible = "ibm,opb",},
44 {.compatible = "simple-bus",},
45 {.compatible = "wrs,epld-localbus",},
46 {},
47 };
48
49 static unsigned int legacy_serial_count;
50 static int legacy_serial_console = -1;
51
52 static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
53 UPF_SHARE_IRQ | UPF_FIXED_PORT;
54
55 static unsigned int tsi_serial_in(struct uart_port *p, int offset)
56 {
57 unsigned int tmp;
58 offset = offset << p->regshift;
59 if (offset == UART_IIR) {
60 tmp = readl(p->membase + (UART_IIR & ~3));
61 return (tmp >> 16) & 0xff;
62 } else
63 return readb(p->membase + offset);
64 }
65
66 static void tsi_serial_out(struct uart_port *p, int offset, int value)
67 {
68 offset = offset << p->regshift;
69 if (!((offset == UART_IER) && (value & UART_IER_UUE)))
70 writeb(value, p->membase + offset);
71 }
72
73 static int __init add_legacy_port(struct device_node *np, int want_index,
74 int iotype, phys_addr_t base,
75 phys_addr_t taddr, unsigned long irq,
76 upf_t flags, int irq_check_parent)
77 {
78 const __be32 *clk, *spd, *rs;
79 u32 clock = BASE_BAUD * 16;
80 u32 shift = 0;
81 int index;
82
83
84 clk = of_get_property(np, "clock-frequency", NULL);
85 if (clk && *clk)
86 clock = be32_to_cpup(clk);
87
88
89 spd = of_get_property(np, "current-speed", NULL);
90
91
92 rs = of_get_property(np, "reg-shift", NULL);
93 if (rs && *rs)
94 shift = be32_to_cpup(rs);
95
96
97 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
98 index = want_index;
99 else
100 index = legacy_serial_count;
101
102
103
104
105
106 if (index >= MAX_LEGACY_SERIAL_PORTS)
107 return -1;
108 if (index >= legacy_serial_count)
109 legacy_serial_count = index + 1;
110
111
112 if (legacy_serial_infos[index].np != NULL) {
113
114 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
115 printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
116 index, legacy_serial_count);
117 legacy_serial_ports[legacy_serial_count] =
118 legacy_serial_ports[index];
119 legacy_serial_infos[legacy_serial_count] =
120 legacy_serial_infos[index];
121 legacy_serial_count++;
122 } else {
123 printk(KERN_DEBUG "Replacing legacy port %d\n", index);
124 }
125 }
126
127
128 memset(&legacy_serial_ports[index], 0,
129 sizeof(struct plat_serial8250_port));
130 if (iotype == UPIO_PORT)
131 legacy_serial_ports[index].iobase = base;
132 else
133 legacy_serial_ports[index].mapbase = base;
134
135 legacy_serial_ports[index].iotype = iotype;
136 legacy_serial_ports[index].uartclk = clock;
137 legacy_serial_ports[index].irq = irq;
138 legacy_serial_ports[index].flags = flags;
139 legacy_serial_ports[index].regshift = shift;
140 legacy_serial_infos[index].taddr = taddr;
141 legacy_serial_infos[index].np = of_node_get(np);
142 legacy_serial_infos[index].clock = clock;
143 legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0;
144 legacy_serial_infos[index].irq_check_parent = irq_check_parent;
145
146 if (iotype == UPIO_TSI) {
147 legacy_serial_ports[index].serial_in = tsi_serial_in;
148 legacy_serial_ports[index].serial_out = tsi_serial_out;
149 }
150
151 printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n",
152 index, np);
153 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
154 (iotype == UPIO_PORT) ? "port" : "mem",
155 (unsigned long long)base, (unsigned long long)taddr, irq,
156 legacy_serial_ports[index].uartclk,
157 legacy_serial_infos[index].speed);
158
159 return index;
160 }
161
162 static int __init add_legacy_soc_port(struct device_node *np,
163 struct device_node *soc_dev)
164 {
165 u64 addr;
166 const __be32 *addrp;
167 struct device_node *tsi = of_get_parent(np);
168
169
170
171
172 if (of_get_property(np, "clock-frequency", NULL) == NULL)
173 return -1;
174
175
176 if ((of_get_property(np, "reg-offset", NULL) != NULL))
177 return -1;
178
179
180 if (of_get_property(np, "used-by-rtas", NULL) != NULL)
181 return -1;
182
183
184 addrp = of_get_address(soc_dev, 0, NULL, NULL);
185 if (addrp == NULL)
186 return -1;
187
188 addr = of_translate_address(soc_dev, addrp);
189 if (addr == OF_BAD_ADDR)
190 return -1;
191
192
193
194
195 if (of_node_is_type(tsi, "tsi-bridge"))
196 return add_legacy_port(np, -1, UPIO_TSI, addr, addr,
197 0, legacy_port_flags, 0);
198 else
199 return add_legacy_port(np, -1, UPIO_MEM, addr, addr,
200 0, legacy_port_flags, 0);
201 }
202
203 static int __init add_legacy_isa_port(struct device_node *np,
204 struct device_node *isa_brg)
205 {
206 const __be32 *reg;
207 const char *typep;
208 int index = -1;
209 u64 taddr;
210
211 DBG(" -> add_legacy_isa_port(%pOF)\n", np);
212
213
214 reg = of_get_property(np, "reg", NULL);
215 if (reg == NULL)
216 return -1;
217
218
219 if (!(be32_to_cpu(reg[0]) & 0x00000001))
220 return -1;
221
222
223
224
225 typep = of_get_property(np, "ibm,aix-loc", NULL);
226
227
228 if (typep && *typep == 'S')
229 index = simple_strtol(typep+1, NULL, 0) - 1;
230
231
232
233
234
235
236
237 if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
238 of_get_property(isa_brg, "ranges", NULL)) {
239 taddr = of_translate_address(np, reg);
240 if (taddr == OF_BAD_ADDR)
241 taddr = 0;
242 } else
243 taddr = 0;
244
245
246 return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]),
247 taddr, 0, legacy_port_flags, 0);
248
249 }
250
251 #ifdef CONFIG_PCI
252 static int __init add_legacy_pci_port(struct device_node *np,
253 struct device_node *pci_dev)
254 {
255 u64 addr, base;
256 const __be32 *addrp;
257 unsigned int flags;
258 int iotype, index = -1, lindex = 0;
259
260 DBG(" -> add_legacy_pci_port(%pOF)\n", np);
261
262
263
264
265
266
267
268
269 if (of_get_property(np, "clock-frequency", NULL) == NULL)
270 return -1;
271
272
273 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
274 if (addrp == NULL)
275 return -1;
276
277
278 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
279 addr = of_translate_address(pci_dev, addrp);
280 if (addr == OF_BAD_ADDR)
281 return -1;
282
283
284
285
286 if (iotype == UPIO_MEM)
287 base = addr;
288 else
289 base = of_read_number(&addrp[2], 1);
290
291
292
293
294 if (np != pci_dev) {
295 const __be32 *reg = of_get_property(np, "reg", NULL);
296 if (reg && (be32_to_cpup(reg) < 4))
297 index = lindex = be32_to_cpup(reg);
298 }
299
300
301
302
303
304
305
306 if (of_device_is_compatible(pci_dev, "pci13a8,152") ||
307 of_device_is_compatible(pci_dev, "pci13a8,154") ||
308 of_device_is_compatible(pci_dev, "pci13a8,158")) {
309 addr += 0x200 * lindex;
310 base += 0x200 * lindex;
311 } else {
312 addr += 8 * lindex;
313 base += 8 * lindex;
314 }
315
316
317
318
319 return add_legacy_port(np, index, iotype, base, addr, 0,
320 legacy_port_flags, np != pci_dev);
321 }
322 #endif
323
324 static void __init setup_legacy_serial_console(int console)
325 {
326 struct legacy_serial_info *info = &legacy_serial_infos[console];
327 struct plat_serial8250_port *port = &legacy_serial_ports[console];
328 void __iomem *addr;
329 unsigned int stride;
330
331 stride = 1 << port->regshift;
332
333
334 if (info->taddr) {
335 addr = ioremap(info->taddr, 0x1000);
336 if (addr == NULL)
337 return;
338 udbg_uart_init_mmio(addr, stride);
339 } else {
340
341 if (port->iotype == UPIO_PORT && isa_io_special)
342 udbg_uart_init_pio(port->iobase, stride);
343 else
344 return;
345 }
346
347
348 if (info->speed == 0)
349 info->speed = udbg_probe_uart_speed(info->clock);
350
351
352 DBG("default console speed = %d\n", info->speed);
353 udbg_uart_setup(info->speed, info->clock);
354 }
355
356
357
358
359
360
361
362
363
364
365 void __init find_legacy_serial_ports(void)
366 {
367 struct device_node *np, *stdout = NULL;
368 const char *path;
369 int index;
370
371 DBG(" -> find_legacy_serial_port()\n");
372
373
374 path = of_get_property(of_chosen, "linux,stdout-path", NULL);
375 if (path == NULL)
376 path = of_get_property(of_chosen, "stdout-path", NULL);
377 if (path != NULL) {
378 stdout = of_find_node_by_path(path);
379 if (stdout)
380 DBG("stdout is %pOF\n", stdout);
381 } else {
382 DBG(" no linux,stdout-path !\n");
383 }
384
385
386 for_each_compatible_node(np, "serial", "ns16550") {
387 struct device_node *parent = of_get_parent(np);
388 if (!parent)
389 continue;
390 if (of_match_node(legacy_serial_parents, parent) != NULL) {
391 if (of_device_is_available(np)) {
392 index = add_legacy_soc_port(np, np);
393 if (index >= 0 && np == stdout)
394 legacy_serial_console = index;
395 }
396 }
397 of_node_put(parent);
398 }
399
400
401 for_each_node_by_type(np, "serial") {
402 struct device_node *isa = of_get_parent(np);
403 if (of_node_name_eq(isa, "isa") || of_node_name_eq(isa, "lpc")) {
404 if (of_device_is_available(np)) {
405 index = add_legacy_isa_port(np, isa);
406 if (index >= 0 && np == stdout)
407 legacy_serial_console = index;
408 }
409 }
410 of_node_put(isa);
411 }
412
413 #ifdef CONFIG_PCI
414
415 for (np = NULL; (np = of_find_all_nodes(np));) {
416 struct device_node *pci, *parent = of_get_parent(np);
417 if (of_node_name_eq(parent, "isa")) {
418 of_node_put(parent);
419 continue;
420 }
421 if (!of_node_name_eq(np, "serial") &&
422 !of_node_is_type(np, "serial")) {
423 of_node_put(parent);
424 continue;
425 }
426
427
428
429 if (of_device_is_compatible(np, "pciclass,0700") ||
430 of_device_is_compatible(np, "pciclass,070002"))
431 pci = np;
432 else if (of_device_is_compatible(parent, "pciclass,0700") ||
433 of_device_is_compatible(parent, "pciclass,070002"))
434 pci = parent;
435 else {
436 of_node_put(parent);
437 continue;
438 }
439 index = add_legacy_pci_port(np, pci);
440 if (index >= 0 && np == stdout)
441 legacy_serial_console = index;
442 of_node_put(parent);
443 }
444 #endif
445
446 DBG("legacy_serial_console = %d\n", legacy_serial_console);
447 if (legacy_serial_console >= 0)
448 setup_legacy_serial_console(legacy_serial_console);
449 DBG(" <- find_legacy_serial_port()\n");
450 }
451
452 static struct platform_device serial_device = {
453 .name = "serial8250",
454 .id = PLAT8250_DEV_PLATFORM,
455 .dev = {
456 .platform_data = legacy_serial_ports,
457 },
458 };
459
460 static void __init fixup_port_irq(int index,
461 struct device_node *np,
462 struct plat_serial8250_port *port)
463 {
464 unsigned int virq;
465
466 DBG("fixup_port_irq(%d)\n", index);
467
468 virq = irq_of_parse_and_map(np, 0);
469 if (!virq && legacy_serial_infos[index].irq_check_parent) {
470 np = of_get_parent(np);
471 if (np == NULL)
472 return;
473 virq = irq_of_parse_and_map(np, 0);
474 of_node_put(np);
475 }
476 if (!virq)
477 return;
478
479 port->irq = virq;
480
481 #ifdef CONFIG_SERIAL_8250_FSL
482 if (of_device_is_compatible(np, "fsl,ns16550"))
483 port->handle_irq = fsl8250_handle_irq;
484 #endif
485 }
486
487 static void __init fixup_port_pio(int index,
488 struct device_node *np,
489 struct plat_serial8250_port *port)
490 {
491 #ifdef CONFIG_PCI
492 struct pci_controller *hose;
493
494 DBG("fixup_port_pio(%d)\n", index);
495
496 hose = pci_find_hose_for_OF_device(np);
497 if (hose) {
498 unsigned long offset = (unsigned long)hose->io_base_virt -
499 #ifdef CONFIG_PPC64
500 pci_io_base;
501 #else
502 isa_io_base;
503 #endif
504 DBG("port %d, IO %lx -> %lx\n",
505 index, port->iobase, port->iobase + offset);
506 port->iobase += offset;
507 }
508 #endif
509 }
510
511 static void __init fixup_port_mmio(int index,
512 struct device_node *np,
513 struct plat_serial8250_port *port)
514 {
515 DBG("fixup_port_mmio(%d)\n", index);
516
517 port->membase = ioremap(port->mapbase, 0x100);
518 }
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533 static int __init serial_dev_init(void)
534 {
535 int i;
536
537 if (legacy_serial_count == 0)
538 return -ENODEV;
539
540
541
542
543
544 DBG("Fixing serial ports interrupts and IO ports ...\n");
545
546 for (i = 0; i < legacy_serial_count; i++) {
547 struct plat_serial8250_port *port = &legacy_serial_ports[i];
548 struct device_node *np = legacy_serial_infos[i].np;
549
550 if (!port->irq)
551 fixup_port_irq(i, np, port);
552 if (port->iotype == UPIO_PORT)
553 fixup_port_pio(i, np, port);
554 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
555 fixup_port_mmio(i, np, port);
556 }
557
558 DBG("Registering platform serial ports\n");
559
560 return platform_device_register(&serial_device);
561 }
562 device_initcall(serial_dev_init);
563
564
565 #ifdef CONFIG_SERIAL_8250_CONSOLE
566
567
568
569
570
571
572
573 static int __init check_legacy_serial_console(void)
574 {
575 struct device_node *prom_stdout = NULL;
576 int i, speed = 0, offset = 0;
577 const char *name;
578 const __be32 *spd;
579
580 DBG(" -> check_legacy_serial_console()\n");
581
582
583 if (strstr(boot_command_line, "console=")) {
584 DBG(" console was specified !\n");
585 return -EBUSY;
586 }
587
588 if (!of_chosen) {
589 DBG(" of_chosen is NULL !\n");
590 return -ENODEV;
591 }
592
593 if (legacy_serial_console < 0) {
594 DBG(" legacy_serial_console not found !\n");
595 return -ENODEV;
596 }
597
598
599 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
600 if (name == NULL)
601 name = of_get_property(of_chosen, "stdout-path", NULL);
602 if (name == NULL) {
603 DBG(" no stdout-path !\n");
604 return -ENODEV;
605 }
606 prom_stdout = of_find_node_by_path(name);
607 if (!prom_stdout) {
608 DBG(" can't find stdout package %s !\n", name);
609 return -ENODEV;
610 }
611 DBG("stdout is %pOF\n", prom_stdout);
612
613 name = of_get_property(prom_stdout, "name", NULL);
614 if (!name) {
615 DBG(" stdout package has no name !\n");
616 goto not_found;
617 }
618 spd = of_get_property(prom_stdout, "current-speed", NULL);
619 if (spd)
620 speed = be32_to_cpup(spd);
621
622 if (strcmp(name, "serial") != 0)
623 goto not_found;
624
625
626 for (i = 0; i < legacy_serial_count; i++) {
627 if (prom_stdout != legacy_serial_infos[i].np)
628 continue;
629 offset = i;
630 speed = legacy_serial_infos[i].speed;
631 break;
632 }
633 if (i >= legacy_serial_count)
634 goto not_found;
635
636 of_node_put(prom_stdout);
637
638 DBG("Found serial console at ttyS%d\n", offset);
639
640 if (speed) {
641 static char __initdata opt[16];
642 sprintf(opt, "%d", speed);
643 return add_preferred_console("ttyS", offset, opt);
644 } else
645 return add_preferred_console("ttyS", offset, NULL);
646
647 not_found:
648 DBG("No preferred console found !\n");
649 of_node_put(prom_stdout);
650 return -ENODEV;
651 }
652 console_initcall(check_legacy_serial_console);
653
654 #endif