1 #include <linux/config.h>
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>
11 #include <asm/serial.h>
13 #include <asm/pci-bridge.h>
14 #include <asm/ppc-pci.h>
19 #define DBG(fmt...) do { printk(fmt); } while(0)
21 #define DBG(fmt...) do { } while(0)
24 #define MAX_LEGACY_SERIAL_PORTS 8
26 static struct plat_serial8250_port
27 legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
28 static struct legacy_serial_info {
29 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)
41 u32 *clk, *spd, clock = BASE_BAUD * 16;
44 /* get clock freq. if present */
45 clk = (u32 *)get_property(np, "clock-frequency", NULL);
49 /* get default speed if present */
50 spd = (u32 *)get_property(np, "current-speed", NULL);
52 /* If we have a location index, then try to use it */
53 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
56 index = legacy_serial_count;
58 /* if our index is still out of range, that mean that
59 * array is full, we could scan for a free slot but that
60 * make little sense to bother, just skip the port
62 if (index >= MAX_LEGACY_SERIAL_PORTS)
64 if (index >= legacy_serial_count)
65 legacy_serial_count = index + 1;
67 /* Check if there is a port who already claimed our slot */
68 if (legacy_serial_infos[index].np != 0) {
69 /* if we still have some room, move it, else override */
70 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
71 printk(KERN_INFO "Moved legacy port %d -> %d\n",
72 index, legacy_serial_count);
73 legacy_serial_ports[legacy_serial_count] =
74 legacy_serial_ports[index];
75 legacy_serial_infos[legacy_serial_count] =
76 legacy_serial_infos[index];
77 legacy_serial_count++;
79 printk(KERN_INFO "Replacing legacy port %d\n", index);
83 /* Now fill the entry */
84 memset(&legacy_serial_ports[index], 0,
85 sizeof(struct plat_serial8250_port));
86 if (iotype == UPIO_PORT)
87 legacy_serial_ports[index].iobase = base;
89 legacy_serial_ports[index].mapbase = base;
90 legacy_serial_ports[index].iotype = iotype;
91 legacy_serial_ports[index].uartclk = clock;
92 legacy_serial_ports[index].irq = irq;
93 legacy_serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
94 legacy_serial_infos[index].taddr = taddr;
95 legacy_serial_infos[index].np = of_node_get(np);
96 legacy_serial_infos[index].clock = clock;
97 legacy_serial_infos[index].speed = spd ? *spd : 0;
99 printk(KERN_INFO "Found legacy serial port %d for %s\n",
100 index, np->full_name);
101 printk(KERN_INFO " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
102 (iotype == UPIO_PORT) ? "port" : "mem",
103 (unsigned long long)base, (unsigned long long)taddr, irq,
104 legacy_serial_ports[index].uartclk,
105 legacy_serial_infos[index].speed);
110 static int __init add_legacy_isa_port(struct device_node *np,
111 struct device_node *isa_bridge)
118 /* Get the ISA port number */
119 reg = (u32 *)get_property(np, "reg", NULL);
123 /* Verify it's an IO port, we don't support anything else */
124 if (!(reg[0] & 0x00000001))
127 /* Now look for an "ibm,aix-loc" property that gives us ordering
130 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
132 /* If we have a location index, then use it */
133 if (typep && *typep == 'S')
134 index = simple_strtol(typep+1, NULL, 0) - 1;
136 /* Translate ISA address */
137 taddr = of_translate_address(np, reg);
139 /* Add port, irq will be dealt with later */
140 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, NO_IRQ);
144 static int __init add_legacy_pci_port(struct device_node *np,
145 struct device_node *pci_dev)
147 phys_addr_t addr, base;
150 int iotype, index = -1, lindex = 0;
152 /* We only support ports that have a clock frequency properly
153 * encoded in the device-tree (that is have an fcode). Anything
154 * else can't be used that early and will be normally probed by
155 * the generic 8250_pci driver later on. The reason is that 8250
156 * compatible UARTs on PCI need all sort of quirks (port offsets
157 * etc...) that this code doesn't know about
159 if (get_property(np, "clock-frequency", NULL) == NULL)
162 /* Get the PCI address. Assume BAR 0 */
163 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
167 /* We only support BAR 0 for now */
168 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
169 addr = of_translate_address(pci_dev, addrp);
171 /* Set the IO base to the same as the translated address for MMIO,
172 * or to the domain local IO base for PIO (it will be fixed up later)
174 if (iotype == UPIO_MEM)
179 /* Try to guess an index... If we have subdevices of the pci dev,
180 * we get to their "reg" property
183 u32 *reg = (u32 *)get_property(np, "reg", NULL);
184 if (reg && (*reg < 4))
185 index = lindex = *reg;
188 /* Local index means it's the Nth port in the PCI chip. Unfortunately
189 * the offset to add here is device specific. We know about those
190 * EXAR ports and we default to the most common case. If your UART
191 * doesn't work for these settings, you'll have to add your own special
194 if (device_is_compatible(pci_dev, "pci13a8,152") ||
195 device_is_compatible(pci_dev, "pci13a8,154") ||
196 device_is_compatible(pci_dev, "pci13a8,158")) {
197 addr += 0x200 * lindex;
198 base += 0x200 * lindex;
204 /* Add port, irq will be dealt with later. We passed a translated
205 * IO port value. It will be fixed up later along with the irq
207 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ);
211 * This is called very early, as part of setup_system() or eventually
212 * setup_arch(), basically before anything else in this file. This function
213 * will try to build a list of all the available 8250-compatible serial ports
214 * in the machine using the Open Firmware device-tree. It currently only deals
215 * with ISA and PCI busses but could be extended. It allows a very early boot
216 * console to be initialized, that list is also used later to provide 8250 with
217 * the machine non-PCI ports and to properly pick the default console port
219 void __init find_legacy_serial_ports(void)
221 struct device_node *np, *stdout;
225 DBG(" -> find_legacy_serial_port()\n");
227 /* Now find out if one of these is out firmware console */
228 path = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
230 DBG(" no linux,stdout-path !\n");
233 stdout = of_find_node_by_path(path);
235 DBG("stdout is %s\n", stdout->full_name);
238 /* First fill our array with ISA ports */
239 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
240 struct device_node *isa = of_get_parent(np);
241 if (isa && !strcmp(isa->name, "isa")) {
242 index = add_legacy_isa_port(np, isa);
243 if (index >= 0 && np == stdout)
244 legacy_serial_console = index;
249 /* Next, try to locate PCI ports */
250 for (np = NULL; (np = of_find_all_nodes(np));) {
251 struct device_node *pci, *parent = of_get_parent(np);
252 if (parent && !strcmp(parent->name, "isa")) {
256 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
260 /* Check for known pciclass, and also check wether we have
261 * a device with child nodes for ports or not
263 if (device_is_compatible(np, "pciclass,0700") ||
264 device_is_compatible(np, "pciclass,070002"))
266 else if (device_is_compatible(parent, "pciclass,0700") ||
267 device_is_compatible(parent, "pciclass,070002"))
273 index = add_legacy_pci_port(np, pci);
274 if (index >= 0 && np == stdout)
275 legacy_serial_console = index;
279 DBG("legacy_serial_console = %d\n", legacy_serial_console);
281 /* udbg is 64 bits only for now, that will change soon though ... */
282 while (legacy_serial_console >= 0) {
283 struct legacy_serial_info *info =
284 &legacy_serial_infos[legacy_serial_console];
287 if (info->taddr == 0)
289 addr = ioremap(info->taddr, 0x1000);
292 if (info->speed == 0)
293 info->speed = udbg_probe_uart_speed(addr, info->clock);
294 DBG("default console speed = %d\n", info->speed);
295 udbg_init_uart(addr, info->speed, info->clock);
299 DBG(" <- find_legacy_serial_port()\n");
302 static struct platform_device serial_device = {
303 .name = "serial8250",
304 .id = PLAT8250_DEV_PLATFORM,
306 .platform_data = legacy_serial_ports,
310 static void __init fixup_port_irq(int index,
311 struct device_node *np,
312 struct plat_serial8250_port *port)
314 DBG("fixup_port_irq(%d)\n", index);
316 /* Check for interrupts in that node */
317 if (np->n_intrs > 0) {
318 port->irq = np->intrs[0].line;
319 DBG(" port %d (%s), irq=%d\n",
320 index, np->full_name, port->irq);
324 /* Check for interrupts in the parent */
325 np = of_get_parent(np);
329 if (np->n_intrs > 0) {
330 port->irq = np->intrs[0].line;
331 DBG(" port %d (%s), irq=%d\n",
332 index, np->full_name, port->irq);
337 static void __init fixup_port_pio(int index,
338 struct device_node *np,
339 struct plat_serial8250_port *port)
341 struct pci_controller *hose;
343 DBG("fixup_port_pio(%d)\n", index);
345 hose = pci_find_hose_for_OF_device(np);
347 unsigned long offset = (unsigned long)hose->io_base_virt -
353 DBG("port %d, IO %lx -> %lx\n",
354 index, port->iobase, port->iobase + offset);
355 port->iobase += offset;
359 static void __init fixup_port_mmio(int index,
360 struct device_node *np,
361 struct plat_serial8250_port *port)
363 DBG("fixup_port_mmio(%d)\n", index);
365 port->membase = ioremap(port->mapbase, 0x100);
369 * This is called as an arch initcall, hopefully before the PCI bus is
370 * probed and/or the 8250 driver loaded since we need to register our
371 * platform devices before 8250 PCI ones are detected as some of them
372 * must properly "override" the platform ones.
374 * This function fixes up the interrupt value for platform ports as it
375 * couldn't be done earlier before interrupt maps have been parsed. It
376 * also "corrects" the IO address for PIO ports for the same reason,
377 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
378 * registers all those platform ports for use by the 8250 driver when it
381 static int __init serial_dev_init(void)
385 if (legacy_serial_count == 0)
389 * Before we register the platfrom serial devices, we need
390 * to fixup their interrutps and their IO ports.
392 DBG("Fixing serial ports interrupts and IO ports ...\n");
394 for (i = 0; i < legacy_serial_count; i++) {
395 struct plat_serial8250_port *port = &legacy_serial_ports[i];
396 struct device_node *np = legacy_serial_infos[i].np;
398 if (port->irq == NO_IRQ)
399 fixup_port_irq(i, np, port);
400 if (port->iotype == UPIO_PORT)
401 fixup_port_pio(i, np, port);
402 if (port->iotype == UPIO_MEM)
403 fixup_port_mmio(i, np, port);
406 DBG("Registering platform serial ports\n");
408 return platform_device_register(&serial_device);
410 arch_initcall(serial_dev_init);
414 * This is called very early, as part of console_init() (typically just after
415 * time_init()). This function is respondible for trying to find a good
416 * default console on serial ports. It tries to match the open firmware
417 * default output with one of the available serial console drivers, either
418 * one of the platform serial ports that have been probed earlier by
419 * find_legacy_serial_ports() or some more platform specific ones.
421 static int __init check_legacy_serial_console(void)
423 struct device_node *prom_stdout = NULL;
424 int speed = 0, offset = 0;
428 DBG(" -> check_legacy_serial_console()\n");
430 /* The user has requested a console so this is already set up. */
431 if (strstr(saved_command_line, "console=")) {
432 DBG(" console was specified !\n");
437 DBG(" of_chosen is NULL !\n");
440 /* We are getting a weird phandle from OF ... */
441 /* ... So use the full path instead */
442 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
444 DBG(" no linux,stdout-path !\n");
447 prom_stdout = of_find_node_by_path(name);
449 DBG(" can't find stdout package %s !\n", name);
452 DBG("stdout is %s\n", prom_stdout->full_name);
454 name = (char *)get_property(prom_stdout, "name", NULL);
456 DBG(" stdout package has no name !\n");
459 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
465 #ifdef CONFIG_SERIAL_8250_CONSOLE
466 else if (strcmp(name, "serial") == 0) {
468 /* Look for it in probed array */
469 for (i = 0; i < legacy_serial_count; i++) {
470 if (prom_stdout != legacy_serial_infos[i].np)
473 speed = legacy_serial_infos[i].speed;
476 if (i >= legacy_serial_count)
479 #endif /* CONFIG_SERIAL_8250_CONSOLE */
480 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
481 else if (strcmp(name, "ch-a") == 0)
483 else if (strcmp(name, "ch-b") == 0)
485 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
488 of_node_put(prom_stdout);
490 DBG("Found serial console at ttyS%d\n", offset);
493 static char __initdata opt[16];
494 sprintf(opt, "%d", speed);
495 return add_preferred_console("ttyS", offset, opt);
497 return add_preferred_console("ttyS", offset, NULL);
500 DBG("No preferred console found !\n");
501 of_node_put(prom_stdout);
504 console_initcall(check_legacy_serial_console);