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1// SPDX-License-Identifier: GPL-2.0
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#include <asm/early_ioremap.h>
19
20#undef DEBUG
21
22#ifdef DEBUG
23#define DBG(fmt...) do { printk(fmt); } while(0)
24#else
25#define DBG(fmt...) do { } while(0)
26#endif
27
28#define MAX_LEGACY_SERIAL_PORTS 8
29
30static struct plat_serial8250_port
31legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
32static struct legacy_serial_info {
33 struct device_node *np;
34 unsigned int speed;
35 unsigned int clock;
36 int irq_check_parent;
37 phys_addr_t taddr;
38 void __iomem *early_addr;
39} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
40
41static const struct of_device_id legacy_serial_parents[] __initconst = {
42 {.type = "soc",},
43 {.type = "tsi-bridge",},
44 {.type = "opb", },
45 {.compatible = "ibm,opb",},
46 {.compatible = "simple-bus",},
47 {.compatible = "wrs,epld-localbus",},
48 {},
49};
50
51static unsigned int legacy_serial_count;
52static int legacy_serial_console = -1;
53
54static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
55 UPF_SHARE_IRQ | UPF_FIXED_PORT;
56
57static unsigned int tsi_serial_in(struct uart_port *p, int offset)
58{
59 unsigned int tmp;
60 offset = offset << p->regshift;
61 if (offset == UART_IIR) {
62 tmp = readl(p->membase + (UART_IIR & ~3));
63 return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */
64 } else
65 return readb(p->membase + offset);
66}
67
68static void tsi_serial_out(struct uart_port *p, int offset, int value)
69{
70 offset = offset << p->regshift;
71 if (!((offset == UART_IER) && (value & UART_IER_UUE)))
72 writeb(value, p->membase + offset);
73}
74
75static int __init add_legacy_port(struct device_node *np, int want_index,
76 int iotype, phys_addr_t base,
77 phys_addr_t taddr, unsigned long irq,
78 upf_t flags, int irq_check_parent)
79{
80 const __be32 *clk, *spd, *rs;
81 u32 clock = BASE_BAUD * 16;
82 u32 shift = 0;
83 int index;
84
85 /* get clock freq. if present */
86 clk = of_get_property(np, "clock-frequency", NULL);
87 if (clk && *clk)
88 clock = be32_to_cpup(clk);
89
90 /* get default speed if present */
91 spd = of_get_property(np, "current-speed", NULL);
92
93 /* get register shift if present */
94 rs = of_get_property(np, "reg-shift", NULL);
95 if (rs && *rs)
96 shift = be32_to_cpup(rs);
97
98 /* If we have a location index, then try to use it */
99 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
100 index = want_index;
101 else
102 index = legacy_serial_count;
103
104 /* if our index is still out of range, that mean that
105 * array is full, we could scan for a free slot but that
106 * make little sense to bother, just skip the port
107 */
108 if (index >= MAX_LEGACY_SERIAL_PORTS)
109 return -1;
110 if (index >= legacy_serial_count)
111 legacy_serial_count = index + 1;
112
113 /* Check if there is a port who already claimed our slot */
114 if (legacy_serial_infos[index].np != NULL) {
115 /* if we still have some room, move it, else override */
116 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
117 printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
118 index, legacy_serial_count);
119 legacy_serial_ports[legacy_serial_count] =
120 legacy_serial_ports[index];
121 legacy_serial_infos[legacy_serial_count] =
122 legacy_serial_infos[index];
123 legacy_serial_count++;
124 } else {
125 printk(KERN_DEBUG "Replacing legacy port %d\n", index);
126 }
127 }
128
129 /* Now fill the entry */
130 memset(&legacy_serial_ports[index], 0,
131 sizeof(struct plat_serial8250_port));
132 if (iotype == UPIO_PORT)
133 legacy_serial_ports[index].iobase = base;
134 else
135 legacy_serial_ports[index].mapbase = base;
136
137 legacy_serial_ports[index].iotype = iotype;
138 legacy_serial_ports[index].uartclk = clock;
139 legacy_serial_ports[index].irq = irq;
140 legacy_serial_ports[index].flags = flags;
141 legacy_serial_ports[index].regshift = shift;
142 legacy_serial_infos[index].taddr = taddr;
143 legacy_serial_infos[index].np = of_node_get(np);
144 legacy_serial_infos[index].clock = clock;
145 legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0;
146 legacy_serial_infos[index].irq_check_parent = irq_check_parent;
147
148 if (iotype == UPIO_TSI) {
149 legacy_serial_ports[index].serial_in = tsi_serial_in;
150 legacy_serial_ports[index].serial_out = tsi_serial_out;
151 }
152
153 printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n",
154 index, np);
155 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
156 (iotype == UPIO_PORT) ? "port" : "mem",
157 (unsigned long long)base, (unsigned long long)taddr, irq,
158 legacy_serial_ports[index].uartclk,
159 legacy_serial_infos[index].speed);
160
161 return index;
162}
163
164static int __init add_legacy_soc_port(struct device_node *np,
165 struct device_node *soc_dev)
166{
167 u64 addr;
168 const __be32 *addrp;
169 struct device_node *tsi = of_get_parent(np);
170
171 /* We only support ports that have a clock frequency properly
172 * encoded in the device-tree.
173 */
174 if (of_get_property(np, "clock-frequency", NULL) == NULL)
175 return -1;
176
177 /* if reg-offset don't try to use it */
178 if ((of_get_property(np, "reg-offset", NULL) != NULL))
179 return -1;
180
181 /* if rtas uses this device, don't try to use it as well */
182 if (of_get_property(np, "used-by-rtas", NULL) != NULL)
183 return -1;
184
185 /* Get the address */
186 addrp = of_get_address(soc_dev, 0, NULL, NULL);
187 if (addrp == NULL)
188 return -1;
189
190 addr = of_translate_address(soc_dev, addrp);
191 if (addr == OF_BAD_ADDR)
192 return -1;
193
194 /* Add port, irq will be dealt with later. We passed a translated
195 * IO port value. It will be fixed up later along with the irq
196 */
197 if (of_node_is_type(tsi, "tsi-bridge"))
198 return add_legacy_port(np, -1, UPIO_TSI, addr, addr,
199 0, legacy_port_flags, 0);
200 else
201 return add_legacy_port(np, -1, UPIO_MEM, addr, addr,
202 0, legacy_port_flags, 0);
203}
204
205static int __init add_legacy_isa_port(struct device_node *np,
206 struct device_node *isa_brg)
207{
208 const __be32 *reg;
209 const char *typep;
210 int index = -1;
211 u64 taddr;
212
213 DBG(" -> add_legacy_isa_port(%pOF)\n", np);
214
215 /* Get the ISA port number */
216 reg = of_get_property(np, "reg", NULL);
217 if (reg == NULL)
218 return -1;
219
220 /* Verify it's an IO port, we don't support anything else */
221 if (!(be32_to_cpu(reg[0]) & 0x00000001))
222 return -1;
223
224 /* Now look for an "ibm,aix-loc" property that gives us ordering
225 * if any...
226 */
227 typep = of_get_property(np, "ibm,aix-loc", NULL);
228
229 /* If we have a location index, then use it */
230 if (typep && *typep == 'S')
231 index = simple_strtol(typep+1, NULL, 0) - 1;
232
233 /* Translate ISA address. If it fails, we still register the port
234 * with no translated address so that it can be picked up as an IO
235 * port later by the serial driver
236 *
237 * Note: Don't even try on P8 lpc, we know it's not directly mapped
238 */
239 if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
240 of_get_property(isa_brg, "ranges", NULL)) {
241 taddr = of_translate_address(np, reg);
242 if (taddr == OF_BAD_ADDR)
243 taddr = 0;
244 } else
245 taddr = 0;
246
247 /* Add port, irq will be dealt with later */
248 return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]),
249 taddr, 0, legacy_port_flags, 0);
250
251}
252
253#ifdef CONFIG_PCI
254static int __init add_legacy_pci_port(struct device_node *np,
255 struct device_node *pci_dev)
256{
257 u64 addr, base;
258 const __be32 *addrp;
259 unsigned int flags;
260 int iotype, index = -1, lindex = 0;
261
262 DBG(" -> add_legacy_pci_port(%pOF)\n", np);
263
264 /* We only support ports that have a clock frequency properly
265 * encoded in the device-tree (that is have an fcode). Anything
266 * else can't be used that early and will be normally probed by
267 * the generic 8250_pci driver later on. The reason is that 8250
268 * compatible UARTs on PCI need all sort of quirks (port offsets
269 * etc...) that this code doesn't know about
270 */
271 if (of_get_property(np, "clock-frequency", NULL) == NULL)
272 return -1;
273
274 /* Get the PCI address. Assume BAR 0 */
275 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
276 if (addrp == NULL)
277 return -1;
278
279 /* We only support BAR 0 for now */
280 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
281 addr = of_translate_address(pci_dev, addrp);
282 if (addr == OF_BAD_ADDR)
283 return -1;
284
285 /* Set the IO base to the same as the translated address for MMIO,
286 * or to the domain local IO base for PIO (it will be fixed up later)
287 */
288 if (iotype == UPIO_MEM)
289 base = addr;
290 else
291 base = of_read_number(&addrp[2], 1);
292
293 /* Try to guess an index... If we have subdevices of the pci dev,
294 * we get to their "reg" property
295 */
296 if (np != pci_dev) {
297 const __be32 *reg = of_get_property(np, "reg", NULL);
298 if (reg && (be32_to_cpup(reg) < 4))
299 index = lindex = be32_to_cpup(reg);
300 }
301
302 /* Local index means it's the Nth port in the PCI chip. Unfortunately
303 * the offset to add here is device specific. We know about those
304 * EXAR ports and we default to the most common case. If your UART
305 * doesn't work for these settings, you'll have to add your own special
306 * cases here
307 */
308 if (of_device_is_compatible(pci_dev, "pci13a8,152") ||
309 of_device_is_compatible(pci_dev, "pci13a8,154") ||
310 of_device_is_compatible(pci_dev, "pci13a8,158")) {
311 addr += 0x200 * lindex;
312 base += 0x200 * lindex;
313 } else {
314 addr += 8 * lindex;
315 base += 8 * lindex;
316 }
317
318 /* Add port, irq will be dealt with later. We passed a translated
319 * IO port value. It will be fixed up later along with the irq
320 */
321 return add_legacy_port(np, index, iotype, base, addr, 0,
322 legacy_port_flags, np != pci_dev);
323}
324#endif
325
326static void __init setup_legacy_serial_console(int console)
327{
328 struct legacy_serial_info *info = &legacy_serial_infos[console];
329 struct plat_serial8250_port *port = &legacy_serial_ports[console];
330 unsigned int stride;
331
332 stride = 1 << port->regshift;
333
334 /* Check if a translated MMIO address has been found */
335 if (info->taddr) {
336 info->early_addr = early_ioremap(info->taddr, 0x1000);
337 if (info->early_addr == NULL)
338 return;
339 udbg_uart_init_mmio(info->early_addr, stride);
340 } else {
341 /* Check if it's PIO and we support untranslated PIO */
342 if (port->iotype == UPIO_PORT && isa_io_special)
343 udbg_uart_init_pio(port->iobase, stride);
344 else
345 return;
346 }
347
348 /* Try to query the current speed */
349 if (info->speed == 0)
350 info->speed = udbg_probe_uart_speed(info->clock);
351
352 /* Set it up */
353 DBG("default console speed = %d\n", info->speed);
354 udbg_uart_setup(info->speed, info->clock);
355}
356
357static int __init ioremap_legacy_serial_console(void)
358{
359 struct plat_serial8250_port *port;
360 struct legacy_serial_info *info;
361 void __iomem *vaddr;
362
363 if (legacy_serial_console < 0)
364 return 0;
365
366 info = &legacy_serial_infos[legacy_serial_console];
367 port = &legacy_serial_ports[legacy_serial_console];
368
369 if (!info->early_addr)
370 return 0;
371
372 vaddr = ioremap(info->taddr, 0x1000);
373 if (WARN_ON(!vaddr))
374 return -ENOMEM;
375
376 udbg_uart_init_mmio(vaddr, 1 << port->regshift);
377 early_iounmap(info->early_addr, 0x1000);
378 info->early_addr = NULL;
379
380 return 0;
381}
382early_initcall(ioremap_legacy_serial_console);
383
384/*
385 * This is called very early, as part of setup_system() or eventually
386 * setup_arch(), basically before anything else in this file. This function
387 * will try to build a list of all the available 8250-compatible serial ports
388 * in the machine using the Open Firmware device-tree. It currently only deals
389 * with ISA and PCI busses but could be extended. It allows a very early boot
390 * console to be initialized, that list is also used later to provide 8250 with
391 * the machine non-PCI ports and to properly pick the default console port
392 */
393void __init find_legacy_serial_ports(void)
394{
395 struct device_node *np, *stdout = NULL;
396 const char *path;
397 int index;
398
399 DBG(" -> find_legacy_serial_port()\n");
400
401 /* Now find out if one of these is out firmware console */
402 path = of_get_property(of_chosen, "linux,stdout-path", NULL);
403 if (path == NULL)
404 path = of_get_property(of_chosen, "stdout-path", NULL);
405 if (path != NULL) {
406 stdout = of_find_node_by_path(path);
407 if (stdout)
408 DBG("stdout is %pOF\n", stdout);
409 } else {
410 DBG(" no linux,stdout-path !\n");
411 }
412
413 /* Iterate over all the 16550 ports, looking for known parents */
414 for_each_compatible_node(np, "serial", "ns16550") {
415 struct device_node *parent = of_get_parent(np);
416 if (!parent)
417 continue;
418 if (of_match_node(legacy_serial_parents, parent) != NULL) {
419 if (of_device_is_available(np)) {
420 index = add_legacy_soc_port(np, np);
421 if (index >= 0 && np == stdout)
422 legacy_serial_console = index;
423 }
424 }
425 of_node_put(parent);
426 }
427
428 /* Next, fill our array with ISA ports */
429 for_each_node_by_type(np, "serial") {
430 struct device_node *isa = of_get_parent(np);
431 if (of_node_name_eq(isa, "isa") || of_node_name_eq(isa, "lpc")) {
432 if (of_device_is_available(np)) {
433 index = add_legacy_isa_port(np, isa);
434 if (index >= 0 && np == stdout)
435 legacy_serial_console = index;
436 }
437 }
438 of_node_put(isa);
439 }
440
441#ifdef CONFIG_PCI
442 /* Next, try to locate PCI ports */
443 for (np = NULL; (np = of_find_all_nodes(np));) {
444 struct device_node *pci, *parent = of_get_parent(np);
445 if (of_node_name_eq(parent, "isa")) {
446 of_node_put(parent);
447 continue;
448 }
449 if (!of_node_name_eq(np, "serial") &&
450 !of_node_is_type(np, "serial")) {
451 of_node_put(parent);
452 continue;
453 }
454 /* Check for known pciclass, and also check whether we have
455 * a device with child nodes for ports or not
456 */
457 if (of_device_is_compatible(np, "pciclass,0700") ||
458 of_device_is_compatible(np, "pciclass,070002"))
459 pci = np;
460 else if (of_device_is_compatible(parent, "pciclass,0700") ||
461 of_device_is_compatible(parent, "pciclass,070002"))
462 pci = parent;
463 else {
464 of_node_put(parent);
465 continue;
466 }
467 index = add_legacy_pci_port(np, pci);
468 if (index >= 0 && np == stdout)
469 legacy_serial_console = index;
470 of_node_put(parent);
471 }
472#endif
473
474 DBG("legacy_serial_console = %d\n", legacy_serial_console);
475 if (legacy_serial_console >= 0)
476 setup_legacy_serial_console(legacy_serial_console);
477 DBG(" <- find_legacy_serial_port()\n");
478}
479
480static struct platform_device serial_device = {
481 .name = "serial8250",
482 .id = PLAT8250_DEV_PLATFORM,
483 .dev = {
484 .platform_data = legacy_serial_ports,
485 },
486};
487
488static void __init fixup_port_irq(int index,
489 struct device_node *np,
490 struct plat_serial8250_port *port)
491{
492 unsigned int virq;
493
494 DBG("fixup_port_irq(%d)\n", index);
495
496 virq = irq_of_parse_and_map(np, 0);
497 if (!virq && legacy_serial_infos[index].irq_check_parent) {
498 np = of_get_parent(np);
499 if (np == NULL)
500 return;
501 virq = irq_of_parse_and_map(np, 0);
502 of_node_put(np);
503 }
504 if (!virq)
505 return;
506
507 port->irq = virq;
508
509#ifdef CONFIG_SERIAL_8250_FSL
510 if (of_device_is_compatible(np, "fsl,ns16550")) {
511 port->handle_irq = fsl8250_handle_irq;
512 port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
513 }
514#endif
515}
516
517static void __init fixup_port_pio(int index,
518 struct device_node *np,
519 struct plat_serial8250_port *port)
520{
521#ifdef CONFIG_PCI
522 struct pci_controller *hose;
523
524 DBG("fixup_port_pio(%d)\n", index);
525
526 hose = pci_find_hose_for_OF_device(np);
527 if (hose) {
528 unsigned long offset = (unsigned long)hose->io_base_virt -
529#ifdef CONFIG_PPC64
530 pci_io_base;
531#else
532 isa_io_base;
533#endif
534 DBG("port %d, IO %lx -> %lx\n",
535 index, port->iobase, port->iobase + offset);
536 port->iobase += offset;
537 }
538#endif
539}
540
541static void __init fixup_port_mmio(int index,
542 struct device_node *np,
543 struct plat_serial8250_port *port)
544{
545 DBG("fixup_port_mmio(%d)\n", index);
546
547 port->membase = ioremap(port->mapbase, 0x100);
548}
549
550/*
551 * This is called as an arch initcall, hopefully before the PCI bus is
552 * probed and/or the 8250 driver loaded since we need to register our
553 * platform devices before 8250 PCI ones are detected as some of them
554 * must properly "override" the platform ones.
555 *
556 * This function fixes up the interrupt value for platform ports as it
557 * couldn't be done earlier before interrupt maps have been parsed. It
558 * also "corrects" the IO address for PIO ports for the same reason,
559 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
560 * registers all those platform ports for use by the 8250 driver when it
561 * finally loads.
562 */
563static int __init serial_dev_init(void)
564{
565 int i;
566
567 if (legacy_serial_count == 0)
568 return -ENODEV;
569
570 /*
571 * Before we register the platform serial devices, we need
572 * to fixup their interrupts and their IO ports.
573 */
574 DBG("Fixing serial ports interrupts and IO ports ...\n");
575
576 for (i = 0; i < legacy_serial_count; i++) {
577 struct plat_serial8250_port *port = &legacy_serial_ports[i];
578 struct device_node *np = legacy_serial_infos[i].np;
579
580 if (!port->irq)
581 fixup_port_irq(i, np, port);
582 if (port->iotype == UPIO_PORT)
583 fixup_port_pio(i, np, port);
584 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
585 fixup_port_mmio(i, np, port);
586 }
587
588 DBG("Registering platform serial ports\n");
589
590 return platform_device_register(&serial_device);
591}
592device_initcall(serial_dev_init);
593
594
595#ifdef CONFIG_SERIAL_8250_CONSOLE
596/*
597 * This is called very early, as part of console_init() (typically just after
598 * time_init()). This function is respondible for trying to find a good
599 * default console on serial ports. It tries to match the open firmware
600 * default output with one of the available serial console drivers that have
601 * been probed earlier by find_legacy_serial_ports()
602 */
603static int __init check_legacy_serial_console(void)
604{
605 struct device_node *prom_stdout = NULL;
606 int i, speed = 0, offset = 0;
607 const char *name;
608 const __be32 *spd;
609
610 DBG(" -> check_legacy_serial_console()\n");
611
612 /* The user has requested a console so this is already set up. */
613 if (strstr(boot_command_line, "console=")) {
614 DBG(" console was specified !\n");
615 return -EBUSY;
616 }
617
618 if (!of_chosen) {
619 DBG(" of_chosen is NULL !\n");
620 return -ENODEV;
621 }
622
623 if (legacy_serial_console < 0) {
624 DBG(" legacy_serial_console not found !\n");
625 return -ENODEV;
626 }
627 /* We are getting a weird phandle from OF ... */
628 /* ... So use the full path instead */
629 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
630 if (name == NULL)
631 name = of_get_property(of_chosen, "stdout-path", NULL);
632 if (name == NULL) {
633 DBG(" no stdout-path !\n");
634 return -ENODEV;
635 }
636 prom_stdout = of_find_node_by_path(name);
637 if (!prom_stdout) {
638 DBG(" can't find stdout package %s !\n", name);
639 return -ENODEV;
640 }
641 DBG("stdout is %pOF\n", prom_stdout);
642
643 name = of_get_property(prom_stdout, "name", NULL);
644 if (!name) {
645 DBG(" stdout package has no name !\n");
646 goto not_found;
647 }
648 spd = of_get_property(prom_stdout, "current-speed", NULL);
649 if (spd)
650 speed = be32_to_cpup(spd);
651
652 if (strcmp(name, "serial") != 0)
653 goto not_found;
654
655 /* Look for it in probed array */
656 for (i = 0; i < legacy_serial_count; i++) {
657 if (prom_stdout != legacy_serial_infos[i].np)
658 continue;
659 offset = i;
660 speed = legacy_serial_infos[i].speed;
661 break;
662 }
663 if (i >= legacy_serial_count)
664 goto not_found;
665
666 of_node_put(prom_stdout);
667
668 DBG("Found serial console at ttyS%d\n", offset);
669
670 if (speed) {
671 static char __initdata opt[16];
672 sprintf(opt, "%d", speed);
673 return add_preferred_console("ttyS", offset, opt);
674 } else
675 return add_preferred_console("ttyS", offset, NULL);
676
677 not_found:
678 DBG("No preferred console found !\n");
679 of_node_put(prom_stdout);
680 return -ENODEV;
681}
682console_initcall(check_legacy_serial_console);
683
684#endif /* CONFIG_SERIAL_8250_CONSOLE */
1// SPDX-License-Identifier: GPL-2.0
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
29static struct plat_serial8250_port
30legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
31static 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
39static 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
49static unsigned int legacy_serial_count;
50static int legacy_serial_console = -1;
51
52static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
53 UPF_SHARE_IRQ | UPF_FIXED_PORT;
54
55static 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; /* UART_IIR % 4 == 2 */
62 } else
63 return readb(p->membase + offset);
64}
65
66static 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
73static 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 /* get clock freq. if present */
84 clk = of_get_property(np, "clock-frequency", NULL);
85 if (clk && *clk)
86 clock = be32_to_cpup(clk);
87
88 /* get default speed if present */
89 spd = of_get_property(np, "current-speed", NULL);
90
91 /* get register shift if present */
92 rs = of_get_property(np, "reg-shift", NULL);
93 if (rs && *rs)
94 shift = be32_to_cpup(rs);
95
96 /* If we have a location index, then try to use it */
97 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
98 index = want_index;
99 else
100 index = legacy_serial_count;
101
102 /* if our index is still out of range, that mean that
103 * array is full, we could scan for a free slot but that
104 * make little sense to bother, just skip the port
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 /* Check if there is a port who already claimed our slot */
112 if (legacy_serial_infos[index].np != NULL) {
113 /* if we still have some room, move it, else override */
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 /* Now fill the entry */
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
162static 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 /* We only support ports that have a clock frequency properly
170 * encoded in the device-tree.
171 */
172 if (of_get_property(np, "clock-frequency", NULL) == NULL)
173 return -1;
174
175 /* if reg-offset don't try to use it */
176 if ((of_get_property(np, "reg-offset", NULL) != NULL))
177 return -1;
178
179 /* if rtas uses this device, don't try to use it as well */
180 if (of_get_property(np, "used-by-rtas", NULL) != NULL)
181 return -1;
182
183 /* Get the address */
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 /* Add port, irq will be dealt with later. We passed a translated
193 * IO port value. It will be fixed up later along with the irq
194 */
195 if (tsi && !strcmp(tsi->type, "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
203static 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 /* Get the ISA port number */
214 reg = of_get_property(np, "reg", NULL);
215 if (reg == NULL)
216 return -1;
217
218 /* Verify it's an IO port, we don't support anything else */
219 if (!(be32_to_cpu(reg[0]) & 0x00000001))
220 return -1;
221
222 /* Now look for an "ibm,aix-loc" property that gives us ordering
223 * if any...
224 */
225 typep = of_get_property(np, "ibm,aix-loc", NULL);
226
227 /* If we have a location index, then use it */
228 if (typep && *typep == 'S')
229 index = simple_strtol(typep+1, NULL, 0) - 1;
230
231 /* Translate ISA address. If it fails, we still register the port
232 * with no translated address so that it can be picked up as an IO
233 * port later by the serial driver
234 *
235 * Note: Don't even try on P8 lpc, we know it's not directly mapped
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 /* Add port, irq will be dealt with later */
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
252static 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 /* We only support ports that have a clock frequency properly
263 * encoded in the device-tree (that is have an fcode). Anything
264 * else can't be used that early and will be normally probed by
265 * the generic 8250_pci driver later on. The reason is that 8250
266 * compatible UARTs on PCI need all sort of quirks (port offsets
267 * etc...) that this code doesn't know about
268 */
269 if (of_get_property(np, "clock-frequency", NULL) == NULL)
270 return -1;
271
272 /* Get the PCI address. Assume BAR 0 */
273 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
274 if (addrp == NULL)
275 return -1;
276
277 /* We only support BAR 0 for now */
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 /* Set the IO base to the same as the translated address for MMIO,
284 * or to the domain local IO base for PIO (it will be fixed up later)
285 */
286 if (iotype == UPIO_MEM)
287 base = addr;
288 else
289 base = of_read_number(&addrp[2], 1);
290
291 /* Try to guess an index... If we have subdevices of the pci dev,
292 * we get to their "reg" property
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 /* Local index means it's the Nth port in the PCI chip. Unfortunately
301 * the offset to add here is device specific. We know about those
302 * EXAR ports and we default to the most common case. If your UART
303 * doesn't work for these settings, you'll have to add your own special
304 * cases here
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 /* Add port, irq will be dealt with later. We passed a translated
317 * IO port value. It will be fixed up later along with the irq
318 */
319 return add_legacy_port(np, index, iotype, base, addr, 0,
320 legacy_port_flags, np != pci_dev);
321}
322#endif
323
324static 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 /* Check if a translated MMIO address has been found */
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 /* Check if it's PIO and we support untranslated PIO */
341 if (port->iotype == UPIO_PORT && isa_io_special)
342 udbg_uart_init_pio(port->iobase, stride);
343 else
344 return;
345 }
346
347 /* Try to query the current speed */
348 if (info->speed == 0)
349 info->speed = udbg_probe_uart_speed(info->clock);
350
351 /* Set it up */
352 DBG("default console speed = %d\n", info->speed);
353 udbg_uart_setup(info->speed, info->clock);
354}
355
356/*
357 * This is called very early, as part of setup_system() or eventually
358 * setup_arch(), basically before anything else in this file. This function
359 * will try to build a list of all the available 8250-compatible serial ports
360 * in the machine using the Open Firmware device-tree. It currently only deals
361 * with ISA and PCI busses but could be extended. It allows a very early boot
362 * console to be initialized, that list is also used later to provide 8250 with
363 * the machine non-PCI ports and to properly pick the default console port
364 */
365void __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 /* Now find out if one of these is out firmware console */
374 path = of_get_property(of_chosen, "linux,stdout-path", NULL);
375 if (path != NULL) {
376 stdout = of_find_node_by_path(path);
377 if (stdout)
378 DBG("stdout is %pOF\n", stdout);
379 } else {
380 DBG(" no linux,stdout-path !\n");
381 }
382
383 /* Iterate over all the 16550 ports, looking for known parents */
384 for_each_compatible_node(np, "serial", "ns16550") {
385 struct device_node *parent = of_get_parent(np);
386 if (!parent)
387 continue;
388 if (of_match_node(legacy_serial_parents, parent) != NULL) {
389 if (of_device_is_available(np)) {
390 index = add_legacy_soc_port(np, np);
391 if (index >= 0 && np == stdout)
392 legacy_serial_console = index;
393 }
394 }
395 of_node_put(parent);
396 }
397
398 /* Next, fill our array with ISA ports */
399 for_each_node_by_type(np, "serial") {
400 struct device_node *isa = of_get_parent(np);
401 if (isa && (!strcmp(isa->name, "isa") ||
402 !strcmp(isa->name, "lpc"))) {
403 if (of_device_is_available(np)) {
404 index = add_legacy_isa_port(np, isa);
405 if (index >= 0 && np == stdout)
406 legacy_serial_console = index;
407 }
408 }
409 of_node_put(isa);
410 }
411
412#ifdef CONFIG_PCI
413 /* Next, try to locate PCI ports */
414 for (np = NULL; (np = of_find_all_nodes(np));) {
415 struct device_node *pci, *parent = of_get_parent(np);
416 if (parent && !strcmp(parent->name, "isa")) {
417 of_node_put(parent);
418 continue;
419 }
420 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
421 of_node_put(parent);
422 continue;
423 }
424 /* Check for known pciclass, and also check whether we have
425 * a device with child nodes for ports or not
426 */
427 if (of_device_is_compatible(np, "pciclass,0700") ||
428 of_device_is_compatible(np, "pciclass,070002"))
429 pci = np;
430 else if (of_device_is_compatible(parent, "pciclass,0700") ||
431 of_device_is_compatible(parent, "pciclass,070002"))
432 pci = parent;
433 else {
434 of_node_put(parent);
435 continue;
436 }
437 index = add_legacy_pci_port(np, pci);
438 if (index >= 0 && np == stdout)
439 legacy_serial_console = index;
440 of_node_put(parent);
441 }
442#endif
443
444 DBG("legacy_serial_console = %d\n", legacy_serial_console);
445 if (legacy_serial_console >= 0)
446 setup_legacy_serial_console(legacy_serial_console);
447 DBG(" <- find_legacy_serial_port()\n");
448}
449
450static struct platform_device serial_device = {
451 .name = "serial8250",
452 .id = PLAT8250_DEV_PLATFORM,
453 .dev = {
454 .platform_data = legacy_serial_ports,
455 },
456};
457
458static void __init fixup_port_irq(int index,
459 struct device_node *np,
460 struct plat_serial8250_port *port)
461{
462 unsigned int virq;
463
464 DBG("fixup_port_irq(%d)\n", index);
465
466 virq = irq_of_parse_and_map(np, 0);
467 if (!virq && legacy_serial_infos[index].irq_check_parent) {
468 np = of_get_parent(np);
469 if (np == NULL)
470 return;
471 virq = irq_of_parse_and_map(np, 0);
472 of_node_put(np);
473 }
474 if (!virq)
475 return;
476
477 port->irq = virq;
478
479#ifdef CONFIG_SERIAL_8250_FSL
480 if (of_device_is_compatible(np, "fsl,ns16550"))
481 port->handle_irq = fsl8250_handle_irq;
482#endif
483}
484
485static void __init fixup_port_pio(int index,
486 struct device_node *np,
487 struct plat_serial8250_port *port)
488{
489#ifdef CONFIG_PCI
490 struct pci_controller *hose;
491
492 DBG("fixup_port_pio(%d)\n", index);
493
494 hose = pci_find_hose_for_OF_device(np);
495 if (hose) {
496 unsigned long offset = (unsigned long)hose->io_base_virt -
497#ifdef CONFIG_PPC64
498 pci_io_base;
499#else
500 isa_io_base;
501#endif
502 DBG("port %d, IO %lx -> %lx\n",
503 index, port->iobase, port->iobase + offset);
504 port->iobase += offset;
505 }
506#endif
507}
508
509static void __init fixup_port_mmio(int index,
510 struct device_node *np,
511 struct plat_serial8250_port *port)
512{
513 DBG("fixup_port_mmio(%d)\n", index);
514
515 port->membase = ioremap(port->mapbase, 0x100);
516}
517
518/*
519 * This is called as an arch initcall, hopefully before the PCI bus is
520 * probed and/or the 8250 driver loaded since we need to register our
521 * platform devices before 8250 PCI ones are detected as some of them
522 * must properly "override" the platform ones.
523 *
524 * This function fixes up the interrupt value for platform ports as it
525 * couldn't be done earlier before interrupt maps have been parsed. It
526 * also "corrects" the IO address for PIO ports for the same reason,
527 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
528 * registers all those platform ports for use by the 8250 driver when it
529 * finally loads.
530 */
531static int __init serial_dev_init(void)
532{
533 int i;
534
535 if (legacy_serial_count == 0)
536 return -ENODEV;
537
538 /*
539 * Before we register the platform serial devices, we need
540 * to fixup their interrupts and their IO ports.
541 */
542 DBG("Fixing serial ports interrupts and IO ports ...\n");
543
544 for (i = 0; i < legacy_serial_count; i++) {
545 struct plat_serial8250_port *port = &legacy_serial_ports[i];
546 struct device_node *np = legacy_serial_infos[i].np;
547
548 if (!port->irq)
549 fixup_port_irq(i, np, port);
550 if (port->iotype == UPIO_PORT)
551 fixup_port_pio(i, np, port);
552 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
553 fixup_port_mmio(i, np, port);
554 }
555
556 DBG("Registering platform serial ports\n");
557
558 return platform_device_register(&serial_device);
559}
560device_initcall(serial_dev_init);
561
562
563#ifdef CONFIG_SERIAL_8250_CONSOLE
564/*
565 * This is called very early, as part of console_init() (typically just after
566 * time_init()). This function is respondible for trying to find a good
567 * default console on serial ports. It tries to match the open firmware
568 * default output with one of the available serial console drivers that have
569 * been probed earlier by find_legacy_serial_ports()
570 */
571static int __init check_legacy_serial_console(void)
572{
573 struct device_node *prom_stdout = NULL;
574 int i, speed = 0, offset = 0;
575 const char *name;
576 const __be32 *spd;
577
578 DBG(" -> check_legacy_serial_console()\n");
579
580 /* The user has requested a console so this is already set up. */
581 if (strstr(boot_command_line, "console=")) {
582 DBG(" console was specified !\n");
583 return -EBUSY;
584 }
585
586 if (!of_chosen) {
587 DBG(" of_chosen is NULL !\n");
588 return -ENODEV;
589 }
590
591 if (legacy_serial_console < 0) {
592 DBG(" legacy_serial_console not found !\n");
593 return -ENODEV;
594 }
595 /* We are getting a weird phandle from OF ... */
596 /* ... So use the full path instead */
597 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
598 if (name == NULL) {
599 DBG(" no linux,stdout-path !\n");
600 return -ENODEV;
601 }
602 prom_stdout = of_find_node_by_path(name);
603 if (!prom_stdout) {
604 DBG(" can't find stdout package %s !\n", name);
605 return -ENODEV;
606 }
607 DBG("stdout is %pOF\n", prom_stdout);
608
609 name = of_get_property(prom_stdout, "name", NULL);
610 if (!name) {
611 DBG(" stdout package has no name !\n");
612 goto not_found;
613 }
614 spd = of_get_property(prom_stdout, "current-speed", NULL);
615 if (spd)
616 speed = be32_to_cpup(spd);
617
618 if (strcmp(name, "serial") != 0)
619 goto not_found;
620
621 /* Look for it in probed array */
622 for (i = 0; i < legacy_serial_count; i++) {
623 if (prom_stdout != legacy_serial_infos[i].np)
624 continue;
625 offset = i;
626 speed = legacy_serial_infos[i].speed;
627 break;
628 }
629 if (i >= legacy_serial_count)
630 goto not_found;
631
632 of_node_put(prom_stdout);
633
634 DBG("Found serial console at ttyS%d\n", offset);
635
636 if (speed) {
637 static char __initdata opt[16];
638 sprintf(opt, "%d", speed);
639 return add_preferred_console("ttyS", offset, opt);
640 } else
641 return add_preferred_console("ttyS", offset, NULL);
642
643 not_found:
644 DBG("No preferred console found !\n");
645 of_node_put(prom_stdout);
646 return -ENODEV;
647}
648console_initcall(check_legacy_serial_console);
649
650#endif /* CONFIG_SERIAL_8250_CONSOLE */