Loading...
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 <linux/of_address.h>
8#include <linux/of_device.h>
9#include <linux/serial_reg.h>
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
28static struct plat_serial8250_port
29legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
30static struct legacy_serial_info {
31 struct device_node *np;
32 unsigned int speed;
33 unsigned int clock;
34 int irq_check_parent;
35 phys_addr_t taddr;
36} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
37
38static struct __initdata of_device_id legacy_serial_parents[] = {
39 {.type = "soc",},
40 {.type = "tsi-bridge",},
41 {.type = "opb", },
42 {.compatible = "ibm,opb",},
43 {.compatible = "simple-bus",},
44 {.compatible = "wrs,epld-localbus",},
45 {},
46};
47
48static unsigned int legacy_serial_count;
49static int legacy_serial_console = -1;
50
51static 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
62static 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
69static int __init add_legacy_port(struct device_node *np, int want_index,
70 int iotype, phys_addr_t base,
71 phys_addr_t taddr, unsigned long irq,
72 upf_t flags, int irq_check_parent)
73{
74 const __be32 *clk, *spd;
75 u32 clock = BASE_BAUD * 16;
76 int index;
77
78 /* get clock freq. if present */
79 clk = of_get_property(np, "clock-frequency", NULL);
80 if (clk && *clk)
81 clock = be32_to_cpup(clk);
82
83 /* get default speed if present */
84 spd = of_get_property(np, "current-speed", NULL);
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 */
102 if (legacy_serial_infos[index].np != 0) {
103 /* if we still have some room, move it, else override */
104 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
105 printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
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 {
113 printk(KERN_DEBUG "Replacing legacy port %d\n", index);
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
123 legacy_serial_ports[index].mapbase = base;
124
125 legacy_serial_ports[index].iotype = iotype;
126 legacy_serial_ports[index].uartclk = clock;
127 legacy_serial_ports[index].irq = irq;
128 legacy_serial_ports[index].flags = flags;
129 legacy_serial_infos[index].taddr = taddr;
130 legacy_serial_infos[index].np = of_node_get(np);
131 legacy_serial_infos[index].clock = clock;
132 legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0;
133 legacy_serial_infos[index].irq_check_parent = irq_check_parent;
134
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
140 printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
141 index, np->full_name);
142 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
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
151static int __init add_legacy_soc_port(struct device_node *np,
152 struct device_node *soc_dev)
153{
154 u64 addr;
155 const u32 *addrp;
156 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ
157 | UPF_FIXED_PORT;
158 struct device_node *tsi = of_get_parent(np);
159
160 /* We only support ports that have a clock frequency properly
161 * encoded in the device-tree.
162 */
163 if (of_get_property(np, "clock-frequency", NULL) == NULL)
164 return -1;
165
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
171 /* if rtas uses this device, don't try to use it as well */
172 if (of_get_property(np, "used-by-rtas", NULL) != NULL)
173 return -1;
174
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);
181 if (addr == OF_BAD_ADDR)
182 return -1;
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 */
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);
191}
192
193static int __init add_legacy_isa_port(struct device_node *np,
194 struct device_node *isa_brg)
195{
196 const __be32 *reg;
197 const char *typep;
198 int index = -1;
199 u64 taddr;
200
201 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name);
202
203 /* Get the ISA port number */
204 reg = of_get_property(np, "reg", NULL);
205 if (reg == NULL)
206 return -1;
207
208 /* Verify it's an IO port, we don't support anything else */
209 if (!(be32_to_cpu(reg[0]) & 0x00000001))
210 return -1;
211
212 /* Now look for an "ibm,aix-loc" property that gives us ordering
213 * if any...
214 */
215 typep = of_get_property(np, "ibm,aix-loc", NULL);
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
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 */
225 taddr = of_translate_address(np, reg);
226 if (taddr == OF_BAD_ADDR)
227 taddr = 0;
228
229 /* Add port, irq will be dealt with later */
230 return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]), taddr,
231 NO_IRQ, UPF_BOOT_AUTOCONF, 0);
232
233}
234
235#ifdef CONFIG_PCI
236static int __init add_legacy_pci_port(struct device_node *np,
237 struct device_node *pci_dev)
238{
239 u64 addr, base;
240 const u32 *addrp;
241 unsigned int flags;
242 int iotype, index = -1, lindex = 0;
243
244 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name);
245
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
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
252 */
253 if (of_get_property(np, "clock-frequency", NULL) == NULL)
254 return -1;
255
256 /* Get the PCI address. Assume BAR 0 */
257 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
258 if (addrp == NULL)
259 return -1;
260
261 /* We only support BAR 0 for now */
262 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
263 addr = of_translate_address(pci_dev, addrp);
264 if (addr == OF_BAD_ADDR)
265 return -1;
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) {
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);
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 */
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")) {
293 addr += 0x200 * lindex;
294 base += 0x200 * lindex;
295 } else {
296 addr += 8 * lindex;
297 base += 8 * lindex;
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 */
303 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
304 UPF_BOOT_AUTOCONF, np != pci_dev);
305}
306#endif
307
308static 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
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 */
334void __init find_legacy_serial_ports(void)
335{
336 struct device_node *np, *stdout = NULL;
337 const char *path;
338 int index;
339
340 DBG(" -> find_legacy_serial_port()\n");
341
342 /* Now find out if one of these is out firmware console */
343 path = of_get_property(of_chosen, "linux,stdout-path", NULL);
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 {
349 DBG(" no linux,stdout-path !\n");
350 }
351
352 /* Iterate over all the 16550 ports, looking for known parents */
353 for_each_compatible_node(np, "serial", "ns16550") {
354 struct device_node *parent = of_get_parent(np);
355 if (!parent)
356 continue;
357 if (of_match_node(legacy_serial_parents, parent) != NULL) {
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 }
363 }
364 of_node_put(parent);
365 }
366
367 /* Next, fill our array with ISA ports */
368 for_each_node_by_type(np, "serial") {
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
378#ifdef CONFIG_PCI
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 }
390 /* Check for known pciclass, and also check wether we have
391 * a device with child nodes for ports or not
392 */
393 if (of_device_is_compatible(np, "pciclass,0700") ||
394 of_device_is_compatible(np, "pciclass,070002"))
395 pci = np;
396 else if (of_device_is_compatible(parent, "pciclass,0700") ||
397 of_device_is_compatible(parent, "pciclass,070002"))
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 }
408#endif
409
410 DBG("legacy_serial_console = %d\n", legacy_serial_console);
411 if (legacy_serial_console >= 0)
412 setup_legacy_serial_console(legacy_serial_console);
413 DBG(" <- find_legacy_serial_port()\n");
414}
415
416static struct platform_device serial_device = {
417 .name = "serial8250",
418 .id = PLAT8250_DEV_PLATFORM,
419 .dev = {
420 .platform_data = legacy_serial_ports,
421 },
422};
423
424static void __init fixup_port_irq(int index,
425 struct device_node *np,
426 struct plat_serial8250_port *port)
427{
428 unsigned int virq;
429
430 DBG("fixup_port_irq(%d)\n", index);
431
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);
439 }
440 if (virq == NO_IRQ)
441 return;
442
443 port->irq = virq;
444
445#ifdef CONFIG_SERIAL_8250_FSL
446 if (of_device_is_compatible(np, "fsl,ns16550"))
447 port->handle_irq = fsl8250_handle_irq;
448#endif
449}
450
451static void __init fixup_port_pio(int index,
452 struct device_node *np,
453 struct plat_serial8250_port *port)
454{
455#ifdef CONFIG_PCI
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 }
472#endif
473}
474
475static 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
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 */
497static int __init serial_dev_init(void)
498{
499 int i;
500
501 if (legacy_serial_count == 0)
502 return -ENODEV;
503
504 /*
505 * Before we register the platform serial devices, we need
506 * to fixup their interrupts and their IO ports.
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);
518 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
519 fixup_port_mmio(i, np, port);
520 }
521
522 DBG("Registering platform serial ports\n");
523
524 return platform_device_register(&serial_device);
525}
526device_initcall(serial_dev_init);
527
528
529#ifdef CONFIG_SERIAL_8250_CONSOLE
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
534 * default output with one of the available serial console drivers that have
535 * been probed earlier by find_legacy_serial_ports()
536 */
537static int __init check_legacy_serial_console(void)
538{
539 struct device_node *prom_stdout = NULL;
540 int i, speed = 0, offset = 0;
541 const char *name;
542 const __be32 *spd;
543
544 DBG(" -> check_legacy_serial_console()\n");
545
546 /* The user has requested a console so this is already set up. */
547 if (strstr(boot_command_line, "console=")) {
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 }
556
557 if (legacy_serial_console < 0) {
558 DBG(" legacy_serial_console not found !\n");
559 return -ENODEV;
560 }
561 /* We are getting a weird phandle from OF ... */
562 /* ... So use the full path instead */
563 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
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
575 name = of_get_property(prom_stdout, "name", NULL);
576 if (!name) {
577 DBG(" stdout package has no name !\n");
578 goto not_found;
579 }
580 spd = of_get_property(prom_stdout, "current-speed", NULL);
581 if (spd)
582 speed = be32_to_cpup(spd);
583
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;
594 }
595 if (i >= legacy_serial_count)
596 goto not_found;
597
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}
614console_initcall(check_legacy_serial_console);
615
616#endif /* CONFIG_SERIAL_8250_CONSOLE */