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)
42 u32 *clk, *spd, clock = BASE_BAUD * 16;
45 /* get clock freq. if present */
46 clk = (u32 *)get_property(np, "clock-frequency", NULL);
50 /* get default speed if present */
51 spd = (u32 *)get_property(np, "current-speed", NULL);
53 /* If we have a location index, then try to use it */
54 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
57 index = legacy_serial_count;
59 /* if our index is still out of range, that mean that
60 * array is full, we could scan for a free slot but that
61 * make little sense to bother, just skip the port
63 if (index >= MAX_LEGACY_SERIAL_PORTS)
65 if (index >= legacy_serial_count)
66 legacy_serial_count = index + 1;
68 /* Check if there is a port who already claimed our slot */
69 if (legacy_serial_infos[index].np != 0) {
70 /* if we still have some room, move it, else override */
71 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
72 printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
73 index, legacy_serial_count);
74 legacy_serial_ports[legacy_serial_count] =
75 legacy_serial_ports[index];
76 legacy_serial_infos[legacy_serial_count] =
77 legacy_serial_infos[index];
78 legacy_serial_count++;
80 printk(KERN_DEBUG "Replacing legacy port %d\n", index);
84 /* Now fill the entry */
85 memset(&legacy_serial_ports[index], 0,
86 sizeof(struct plat_serial8250_port));
87 if (iotype == UPIO_PORT)
88 legacy_serial_ports[index].iobase = base;
90 legacy_serial_ports[index].mapbase = base;
91 legacy_serial_ports[index].iotype = iotype;
92 legacy_serial_ports[index].uartclk = clock;
93 legacy_serial_ports[index].irq = irq;
94 legacy_serial_ports[index].flags = flags;
95 legacy_serial_infos[index].taddr = taddr;
96 legacy_serial_infos[index].np = of_node_get(np);
97 legacy_serial_infos[index].clock = clock;
98 legacy_serial_infos[index].speed = spd ? *spd : 0;
99 legacy_serial_infos[index].irq_check_parent = irq_check_parent;
101 printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
102 index, np->full_name);
103 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
104 (iotype == UPIO_PORT) ? "port" : "mem",
105 (unsigned long long)base, (unsigned long long)taddr, irq,
106 legacy_serial_ports[index].uartclk,
107 legacy_serial_infos[index].speed);
112 static int __init add_legacy_soc_port(struct device_node *np,
113 struct device_node *soc_dev)
117 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
119 /* We only support ports that have a clock frequency properly
120 * encoded in the device-tree.
122 if (get_property(np, "clock-frequency", NULL) == NULL)
125 /* Get the address */
126 addrp = of_get_address(soc_dev, 0, NULL, NULL);
130 addr = of_translate_address(soc_dev, addrp);
131 if (addr == OF_BAD_ADDR)
134 /* Add port, irq will be dealt with later. We passed a translated
135 * IO port value. It will be fixed up later along with the irq
137 return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0);
140 static int __init add_legacy_isa_port(struct device_node *np,
141 struct device_node *isa_brg)
148 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name);
150 /* Get the ISA port number */
151 reg = (u32 *)get_property(np, "reg", NULL);
155 /* Verify it's an IO port, we don't support anything else */
156 if (!(reg[0] & 0x00000001))
159 /* Now look for an "ibm,aix-loc" property that gives us ordering
162 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
164 /* If we have a location index, then use it */
165 if (typep && *typep == 'S')
166 index = simple_strtol(typep+1, NULL, 0) - 1;
168 /* Translate ISA address */
169 taddr = of_translate_address(np, reg);
170 if (taddr == OF_BAD_ADDR)
173 /* Add port, irq will be dealt with later */
174 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr,
175 NO_IRQ, UPF_BOOT_AUTOCONF, 0);
180 static int __init add_legacy_pci_port(struct device_node *np,
181 struct device_node *pci_dev)
183 phys_addr_t addr, base;
186 int iotype, index = -1, lindex = 0;
188 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name);
190 /* We only support ports that have a clock frequency properly
191 * encoded in the device-tree (that is have an fcode). Anything
192 * else can't be used that early and will be normally probed by
193 * the generic 8250_pci driver later on. The reason is that 8250
194 * compatible UARTs on PCI need all sort of quirks (port offsets
195 * etc...) that this code doesn't know about
197 if (get_property(np, "clock-frequency", NULL) == NULL)
200 /* Get the PCI address. Assume BAR 0 */
201 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
205 /* We only support BAR 0 for now */
206 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
207 addr = of_translate_address(pci_dev, addrp);
208 if (addr == OF_BAD_ADDR)
211 /* Set the IO base to the same as the translated address for MMIO,
212 * or to the domain local IO base for PIO (it will be fixed up later)
214 if (iotype == UPIO_MEM)
219 /* Try to guess an index... If we have subdevices of the pci dev,
220 * we get to their "reg" property
223 u32 *reg = (u32 *)get_property(np, "reg", NULL);
224 if (reg && (*reg < 4))
225 index = lindex = *reg;
228 /* Local index means it's the Nth port in the PCI chip. Unfortunately
229 * the offset to add here is device specific. We know about those
230 * EXAR ports and we default to the most common case. If your UART
231 * doesn't work for these settings, you'll have to add your own special
234 if (device_is_compatible(pci_dev, "pci13a8,152") ||
235 device_is_compatible(pci_dev, "pci13a8,154") ||
236 device_is_compatible(pci_dev, "pci13a8,158")) {
237 addr += 0x200 * lindex;
238 base += 0x200 * lindex;
244 /* Add port, irq will be dealt with later. We passed a translated
245 * IO port value. It will be fixed up later along with the irq
247 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
248 UPF_BOOT_AUTOCONF, np != pci_dev);
252 static void __init setup_legacy_serial_console(int console)
254 struct legacy_serial_info *info =
255 &legacy_serial_infos[console];
258 if (info->taddr == 0)
260 addr = ioremap(info->taddr, 0x1000);
263 if (info->speed == 0)
264 info->speed = udbg_probe_uart_speed(addr, info->clock);
265 DBG("default console speed = %d\n", info->speed);
266 udbg_init_uart(addr, info->speed, info->clock);
270 * This is called very early, as part of setup_system() or eventually
271 * setup_arch(), basically before anything else in this file. This function
272 * will try to build a list of all the available 8250-compatible serial ports
273 * in the machine using the Open Firmware device-tree. It currently only deals
274 * with ISA and PCI busses but could be extended. It allows a very early boot
275 * console to be initialized, that list is also used later to provide 8250 with
276 * the machine non-PCI ports and to properly pick the default console port
278 void __init find_legacy_serial_ports(void)
280 struct device_node *np, *stdout = NULL;
284 DBG(" -> find_legacy_serial_port()\n");
286 /* Now find out if one of these is out firmware console */
287 path = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
289 stdout = of_find_node_by_path(path);
291 DBG("stdout is %s\n", stdout->full_name);
293 DBG(" no linux,stdout-path !\n");
296 /* First fill our array with SOC ports */
297 for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
298 struct device_node *soc = of_get_parent(np);
299 if (soc && !strcmp(soc->type, "soc")) {
300 index = add_legacy_soc_port(np, np);
301 if (index >= 0 && np == stdout)
302 legacy_serial_console = index;
307 /* First fill our array with ISA ports */
308 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
309 struct device_node *isa = of_get_parent(np);
310 if (isa && !strcmp(isa->name, "isa")) {
311 index = add_legacy_isa_port(np, isa);
312 if (index >= 0 && np == stdout)
313 legacy_serial_console = index;
318 /* First fill our array with tsi-bridge ports */
319 for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
320 struct device_node *tsi = of_get_parent(np);
321 if (tsi && !strcmp(tsi->type, "tsi-bridge")) {
322 index = add_legacy_soc_port(np, np);
323 if (index >= 0 && np == stdout)
324 legacy_serial_console = index;
330 /* Next, try to locate PCI ports */
331 for (np = NULL; (np = of_find_all_nodes(np));) {
332 struct device_node *pci, *parent = of_get_parent(np);
333 if (parent && !strcmp(parent->name, "isa")) {
337 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
341 /* Check for known pciclass, and also check wether we have
342 * a device with child nodes for ports or not
344 if (device_is_compatible(np, "pciclass,0700") ||
345 device_is_compatible(np, "pciclass,070002"))
347 else if (device_is_compatible(parent, "pciclass,0700") ||
348 device_is_compatible(parent, "pciclass,070002"))
354 index = add_legacy_pci_port(np, pci);
355 if (index >= 0 && np == stdout)
356 legacy_serial_console = index;
361 DBG("legacy_serial_console = %d\n", legacy_serial_console);
362 if (legacy_serial_console >= 0)
363 setup_legacy_serial_console(legacy_serial_console);
364 DBG(" <- find_legacy_serial_port()\n");
367 static struct platform_device serial_device = {
368 .name = "serial8250",
369 .id = PLAT8250_DEV_PLATFORM,
371 .platform_data = legacy_serial_ports,
375 static void __init fixup_port_irq(int index,
376 struct device_node *np,
377 struct plat_serial8250_port *port)
381 DBG("fixup_port_irq(%d)\n", index);
383 virq = irq_of_parse_and_map(np, 0);
384 if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) {
385 np = of_get_parent(np);
388 virq = irq_of_parse_and_map(np, 0);
397 static void __init fixup_port_pio(int index,
398 struct device_node *np,
399 struct plat_serial8250_port *port)
402 struct pci_controller *hose;
404 DBG("fixup_port_pio(%d)\n", index);
406 hose = pci_find_hose_for_OF_device(np);
408 unsigned long offset = (unsigned long)hose->io_base_virt -
414 DBG("port %d, IO %lx -> %lx\n",
415 index, port->iobase, port->iobase + offset);
416 port->iobase += offset;
421 static void __init fixup_port_mmio(int index,
422 struct device_node *np,
423 struct plat_serial8250_port *port)
425 DBG("fixup_port_mmio(%d)\n", index);
427 port->membase = ioremap(port->mapbase, 0x100);
431 * This is called as an arch initcall, hopefully before the PCI bus is
432 * probed and/or the 8250 driver loaded since we need to register our
433 * platform devices before 8250 PCI ones are detected as some of them
434 * must properly "override" the platform ones.
436 * This function fixes up the interrupt value for platform ports as it
437 * couldn't be done earlier before interrupt maps have been parsed. It
438 * also "corrects" the IO address for PIO ports for the same reason,
439 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
440 * registers all those platform ports for use by the 8250 driver when it
443 static int __init serial_dev_init(void)
447 if (legacy_serial_count == 0)
451 * Before we register the platfrom serial devices, we need
452 * to fixup their interrutps and their IO ports.
454 DBG("Fixing serial ports interrupts and IO ports ...\n");
456 for (i = 0; i < legacy_serial_count; i++) {
457 struct plat_serial8250_port *port = &legacy_serial_ports[i];
458 struct device_node *np = legacy_serial_infos[i].np;
460 if (port->irq == NO_IRQ)
461 fixup_port_irq(i, np, port);
462 if (port->iotype == UPIO_PORT)
463 fixup_port_pio(i, np, port);
464 if (port->iotype == UPIO_MEM)
465 fixup_port_mmio(i, np, port);
468 DBG("Registering platform serial ports\n");
470 return platform_device_register(&serial_device);
472 arch_initcall(serial_dev_init);
476 * This is called very early, as part of console_init() (typically just after
477 * time_init()). This function is respondible for trying to find a good
478 * default console on serial ports. It tries to match the open firmware
479 * default output with one of the available serial console drivers, either
480 * one of the platform serial ports that have been probed earlier by
481 * find_legacy_serial_ports() or some more platform specific ones.
483 static int __init check_legacy_serial_console(void)
485 struct device_node *prom_stdout = NULL;
486 int speed = 0, offset = 0;
490 DBG(" -> check_legacy_serial_console()\n");
492 /* The user has requested a console so this is already set up. */
493 if (strstr(saved_command_line, "console=")) {
494 DBG(" console was specified !\n");
499 DBG(" of_chosen is NULL !\n");
503 if (legacy_serial_console < 0) {
504 DBG(" legacy_serial_console not found !\n");
507 /* We are getting a weird phandle from OF ... */
508 /* ... So use the full path instead */
509 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
511 DBG(" no linux,stdout-path !\n");
514 prom_stdout = of_find_node_by_path(name);
516 DBG(" can't find stdout package %s !\n", name);
519 DBG("stdout is %s\n", prom_stdout->full_name);
521 name = (char *)get_property(prom_stdout, "name", NULL);
523 DBG(" stdout package has no name !\n");
526 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
532 #ifdef CONFIG_SERIAL_8250_CONSOLE
533 else if (strcmp(name, "serial") == 0) {
535 /* Look for it in probed array */
536 for (i = 0; i < legacy_serial_count; i++) {
537 if (prom_stdout != legacy_serial_infos[i].np)
540 speed = legacy_serial_infos[i].speed;
543 if (i >= legacy_serial_count)
546 #endif /* CONFIG_SERIAL_8250_CONSOLE */
547 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
548 else if (strcmp(name, "ch-a") == 0)
550 else if (strcmp(name, "ch-b") == 0)
552 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
555 of_node_put(prom_stdout);
557 DBG("Found serial console at ttyS%d\n", offset);
560 static char __initdata opt[16];
561 sprintf(opt, "%d", speed);
562 return add_preferred_console("ttyS", offset, opt);
564 return add_preferred_console("ttyS", offset, NULL);
567 DBG("No preferred console found !\n");
568 of_node_put(prom_stdout);
571 console_initcall(check_legacy_serial_console);