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>
10 #include <asm/serial.h>
12 #include <asm/pci-bridge.h>
13 #include <asm/ppc-pci.h>
18 #define DBG(fmt...) do { printk(fmt); } while(0)
20 #define DBG(fmt...) do { } while(0)
23 #define MAX_LEGACY_SERIAL_PORTS 8
25 static struct plat_serial8250_port
26 legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
27 static struct legacy_serial_info {
28 struct device_node *np;
33 } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
34 static unsigned int legacy_serial_count;
35 static int legacy_serial_console = -1;
37 static int __init add_legacy_port(struct device_node *np, int want_index,
38 int iotype, phys_addr_t base,
39 phys_addr_t taddr, unsigned long irq,
40 upf_t flags, int irq_check_parent)
43 u32 clock = BASE_BAUD * 16;
46 /* get clock freq. if present */
47 clk = get_property(np, "clock-frequency", NULL);
51 /* get default speed if present */
52 spd = get_property(np, "current-speed", NULL);
54 /* If we have a location index, then try to use it */
55 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
58 index = legacy_serial_count;
60 /* if our index is still out of range, that mean that
61 * array is full, we could scan for a free slot but that
62 * make little sense to bother, just skip the port
64 if (index >= MAX_LEGACY_SERIAL_PORTS)
66 if (index >= legacy_serial_count)
67 legacy_serial_count = index + 1;
69 /* Check if there is a port who already claimed our slot */
70 if (legacy_serial_infos[index].np != 0) {
71 /* if we still have some room, move it, else override */
72 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
73 printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
74 index, legacy_serial_count);
75 legacy_serial_ports[legacy_serial_count] =
76 legacy_serial_ports[index];
77 legacy_serial_infos[legacy_serial_count] =
78 legacy_serial_infos[index];
79 legacy_serial_count++;
81 printk(KERN_DEBUG "Replacing legacy port %d\n", index);
85 /* Now fill the entry */
86 memset(&legacy_serial_ports[index], 0,
87 sizeof(struct plat_serial8250_port));
88 if (iotype == UPIO_PORT)
89 legacy_serial_ports[index].iobase = base;
91 legacy_serial_ports[index].mapbase = base;
92 legacy_serial_ports[index].iotype = iotype;
93 legacy_serial_ports[index].uartclk = clock;
94 legacy_serial_ports[index].irq = irq;
95 legacy_serial_ports[index].flags = flags;
96 legacy_serial_infos[index].taddr = taddr;
97 legacy_serial_infos[index].np = of_node_get(np);
98 legacy_serial_infos[index].clock = clock;
99 legacy_serial_infos[index].speed = spd ? *spd : 0;
100 legacy_serial_infos[index].irq_check_parent = irq_check_parent;
102 printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
103 index, np->full_name);
104 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
105 (iotype == UPIO_PORT) ? "port" : "mem",
106 (unsigned long long)base, (unsigned long long)taddr, irq,
107 legacy_serial_ports[index].uartclk,
108 legacy_serial_infos[index].speed);
113 static int __init add_legacy_soc_port(struct device_node *np,
114 struct device_node *soc_dev)
118 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
120 /* We only support ports that have a clock frequency properly
121 * encoded in the device-tree.
123 if (get_property(np, "clock-frequency", NULL) == NULL)
126 /* Get the address */
127 addrp = of_get_address(soc_dev, 0, NULL, NULL);
131 addr = of_translate_address(soc_dev, addrp);
132 if (addr == OF_BAD_ADDR)
135 /* Add port, irq will be dealt with later. We passed a translated
136 * IO port value. It will be fixed up later along with the irq
138 return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0);
141 static int __init add_legacy_isa_port(struct device_node *np,
142 struct device_node *isa_brg)
149 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name);
151 /* Get the ISA port number */
152 reg = get_property(np, "reg", NULL);
156 /* Verify it's an IO port, we don't support anything else */
157 if (!(reg[0] & 0x00000001))
160 /* Now look for an "ibm,aix-loc" property that gives us ordering
163 typep = get_property(np, "ibm,aix-loc", NULL);
165 /* If we have a location index, then use it */
166 if (typep && *typep == 'S')
167 index = simple_strtol(typep+1, NULL, 0) - 1;
169 /* Translate ISA address. If it fails, we still register the port
170 * with no translated address so that it can be picked up as an IO
171 * port later by the serial driver
173 taddr = of_translate_address(np, reg);
174 if (taddr == OF_BAD_ADDR)
177 /* Add port, irq will be dealt with later */
178 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr,
179 NO_IRQ, UPF_BOOT_AUTOCONF, 0);
184 static int __init add_legacy_pci_port(struct device_node *np,
185 struct device_node *pci_dev)
190 int iotype, index = -1, lindex = 0;
192 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name);
194 /* We only support ports that have a clock frequency properly
195 * encoded in the device-tree (that is have an fcode). Anything
196 * else can't be used that early and will be normally probed by
197 * the generic 8250_pci driver later on. The reason is that 8250
198 * compatible UARTs on PCI need all sort of quirks (port offsets
199 * etc...) that this code doesn't know about
201 if (get_property(np, "clock-frequency", NULL) == NULL)
204 /* Get the PCI address. Assume BAR 0 */
205 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
209 /* We only support BAR 0 for now */
210 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
211 addr = of_translate_address(pci_dev, addrp);
212 if (addr == OF_BAD_ADDR)
215 /* Set the IO base to the same as the translated address for MMIO,
216 * or to the domain local IO base for PIO (it will be fixed up later)
218 if (iotype == UPIO_MEM)
223 /* Try to guess an index... If we have subdevices of the pci dev,
224 * we get to their "reg" property
227 const u32 *reg = get_property(np, "reg", NULL);
228 if (reg && (*reg < 4))
229 index = lindex = *reg;
232 /* Local index means it's the Nth port in the PCI chip. Unfortunately
233 * the offset to add here is device specific. We know about those
234 * EXAR ports and we default to the most common case. If your UART
235 * doesn't work for these settings, you'll have to add your own special
238 if (device_is_compatible(pci_dev, "pci13a8,152") ||
239 device_is_compatible(pci_dev, "pci13a8,154") ||
240 device_is_compatible(pci_dev, "pci13a8,158")) {
241 addr += 0x200 * lindex;
242 base += 0x200 * lindex;
248 /* Add port, irq will be dealt with later. We passed a translated
249 * IO port value. It will be fixed up later along with the irq
251 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
252 UPF_BOOT_AUTOCONF, np != pci_dev);
256 static void __init setup_legacy_serial_console(int console)
258 struct legacy_serial_info *info =
259 &legacy_serial_infos[console];
262 if (info->taddr == 0)
264 addr = ioremap(info->taddr, 0x1000);
267 if (info->speed == 0)
268 info->speed = udbg_probe_uart_speed(addr, info->clock);
269 DBG("default console speed = %d\n", info->speed);
270 udbg_init_uart(addr, info->speed, info->clock);
274 * This is called very early, as part of setup_system() or eventually
275 * setup_arch(), basically before anything else in this file. This function
276 * will try to build a list of all the available 8250-compatible serial ports
277 * in the machine using the Open Firmware device-tree. It currently only deals
278 * with ISA and PCI busses but could be extended. It allows a very early boot
279 * console to be initialized, that list is also used later to provide 8250 with
280 * the machine non-PCI ports and to properly pick the default console port
282 void __init find_legacy_serial_ports(void)
284 struct device_node *np, *stdout = NULL;
288 DBG(" -> find_legacy_serial_port()\n");
290 /* Now find out if one of these is out firmware console */
291 path = get_property(of_chosen, "linux,stdout-path", NULL);
293 stdout = of_find_node_by_path(path);
295 DBG("stdout is %s\n", stdout->full_name);
297 DBG(" no linux,stdout-path !\n");
300 /* First fill our array with SOC ports */
301 for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
302 struct device_node *soc = of_get_parent(np);
303 if (soc && !strcmp(soc->type, "soc")) {
304 index = add_legacy_soc_port(np, np);
305 if (index >= 0 && np == stdout)
306 legacy_serial_console = index;
311 /* First fill our array with ISA ports */
312 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
313 struct device_node *isa = of_get_parent(np);
314 if (isa && !strcmp(isa->name, "isa")) {
315 index = add_legacy_isa_port(np, isa);
316 if (index >= 0 && np == stdout)
317 legacy_serial_console = index;
322 /* First fill our array with tsi-bridge ports */
323 for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
324 struct device_node *tsi = of_get_parent(np);
325 if (tsi && !strcmp(tsi->type, "tsi-bridge")) {
326 index = add_legacy_soc_port(np, np);
327 if (index >= 0 && np == stdout)
328 legacy_serial_console = index;
334 /* Next, try to locate PCI ports */
335 for (np = NULL; (np = of_find_all_nodes(np));) {
336 struct device_node *pci, *parent = of_get_parent(np);
337 if (parent && !strcmp(parent->name, "isa")) {
341 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
345 /* Check for known pciclass, and also check wether we have
346 * a device with child nodes for ports or not
348 if (device_is_compatible(np, "pciclass,0700") ||
349 device_is_compatible(np, "pciclass,070002"))
351 else if (device_is_compatible(parent, "pciclass,0700") ||
352 device_is_compatible(parent, "pciclass,070002"))
358 index = add_legacy_pci_port(np, pci);
359 if (index >= 0 && np == stdout)
360 legacy_serial_console = index;
365 DBG("legacy_serial_console = %d\n", legacy_serial_console);
366 if (legacy_serial_console >= 0)
367 setup_legacy_serial_console(legacy_serial_console);
368 DBG(" <- find_legacy_serial_port()\n");
371 static struct platform_device serial_device = {
372 .name = "serial8250",
373 .id = PLAT8250_DEV_PLATFORM,
375 .platform_data = legacy_serial_ports,
379 static void __init fixup_port_irq(int index,
380 struct device_node *np,
381 struct plat_serial8250_port *port)
385 DBG("fixup_port_irq(%d)\n", index);
387 virq = irq_of_parse_and_map(np, 0);
388 if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) {
389 np = of_get_parent(np);
392 virq = irq_of_parse_and_map(np, 0);
401 static void __init fixup_port_pio(int index,
402 struct device_node *np,
403 struct plat_serial8250_port *port)
406 struct pci_controller *hose;
408 DBG("fixup_port_pio(%d)\n", index);
410 hose = pci_find_hose_for_OF_device(np);
412 unsigned long offset = (unsigned long)hose->io_base_virt -
418 DBG("port %d, IO %lx -> %lx\n",
419 index, port->iobase, port->iobase + offset);
420 port->iobase += offset;
425 static void __init fixup_port_mmio(int index,
426 struct device_node *np,
427 struct plat_serial8250_port *port)
429 DBG("fixup_port_mmio(%d)\n", index);
431 port->membase = ioremap(port->mapbase, 0x100);
435 * This is called as an arch initcall, hopefully before the PCI bus is
436 * probed and/or the 8250 driver loaded since we need to register our
437 * platform devices before 8250 PCI ones are detected as some of them
438 * must properly "override" the platform ones.
440 * This function fixes up the interrupt value for platform ports as it
441 * couldn't be done earlier before interrupt maps have been parsed. It
442 * also "corrects" the IO address for PIO ports for the same reason,
443 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
444 * registers all those platform ports for use by the 8250 driver when it
447 static int __init serial_dev_init(void)
451 if (legacy_serial_count == 0)
455 * Before we register the platfrom serial devices, we need
456 * to fixup their interrutps and their IO ports.
458 DBG("Fixing serial ports interrupts and IO ports ...\n");
460 for (i = 0; i < legacy_serial_count; i++) {
461 struct plat_serial8250_port *port = &legacy_serial_ports[i];
462 struct device_node *np = legacy_serial_infos[i].np;
464 if (port->irq == NO_IRQ)
465 fixup_port_irq(i, np, port);
466 if (port->iotype == UPIO_PORT)
467 fixup_port_pio(i, np, port);
468 if (port->iotype == UPIO_MEM)
469 fixup_port_mmio(i, np, port);
472 DBG("Registering platform serial ports\n");
474 return platform_device_register(&serial_device);
476 arch_initcall(serial_dev_init);
480 * This is called very early, as part of console_init() (typically just after
481 * time_init()). This function is respondible for trying to find a good
482 * default console on serial ports. It tries to match the open firmware
483 * default output with one of the available serial console drivers, either
484 * one of the platform serial ports that have been probed earlier by
485 * find_legacy_serial_ports() or some more platform specific ones.
487 static int __init check_legacy_serial_console(void)
489 struct device_node *prom_stdout = NULL;
490 int speed = 0, offset = 0;
494 DBG(" -> check_legacy_serial_console()\n");
496 /* The user has requested a console so this is already set up. */
497 if (strstr(saved_command_line, "console=")) {
498 DBG(" console was specified !\n");
503 DBG(" of_chosen is NULL !\n");
507 if (legacy_serial_console < 0) {
508 DBG(" legacy_serial_console not found !\n");
511 /* We are getting a weird phandle from OF ... */
512 /* ... So use the full path instead */
513 name = get_property(of_chosen, "linux,stdout-path", NULL);
515 DBG(" no linux,stdout-path !\n");
518 prom_stdout = of_find_node_by_path(name);
520 DBG(" can't find stdout package %s !\n", name);
523 DBG("stdout is %s\n", prom_stdout->full_name);
525 name = get_property(prom_stdout, "name", NULL);
527 DBG(" stdout package has no name !\n");
530 spd = get_property(prom_stdout, "current-speed", NULL);
536 #ifdef CONFIG_SERIAL_8250_CONSOLE
537 else if (strcmp(name, "serial") == 0) {
539 /* Look for it in probed array */
540 for (i = 0; i < legacy_serial_count; i++) {
541 if (prom_stdout != legacy_serial_infos[i].np)
544 speed = legacy_serial_infos[i].speed;
547 if (i >= legacy_serial_count)
550 #endif /* CONFIG_SERIAL_8250_CONSOLE */
551 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
552 else if (strcmp(name, "ch-a") == 0)
554 else if (strcmp(name, "ch-b") == 0)
556 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
559 of_node_put(prom_stdout);
561 DBG("Found serial console at ttyS%d\n", offset);
564 static char __initdata opt[16];
565 sprintf(opt, "%d", speed);
566 return add_preferred_console("ttyS", offset, opt);
568 return add_preferred_console("ttyS", offset, NULL);
571 DBG("No preferred console found !\n");
572 of_node_put(prom_stdout);
575 console_initcall(check_legacy_serial_console);