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;
44 /* get clock freq. if present */
45 clk = (u32 *)get_property(np, "clock-frequency", NULL);
49 clock = BASE_BAUD * 16;
51 /* get default speed if present */
52 spd = (u32 *)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_INFO "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_INFO "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].membase = (void __iomem *)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 = ASYNC_BOOT_AUTOCONF;
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;
101 printk(KERN_INFO "Found legacy serial port %d for %s\n",
102 index, np->full_name);
103 printk(KERN_INFO " %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_isa_port(struct device_node *np,
113 struct device_node *isa_bridge)
120 /* Get the ISA port number */
121 reg = (u32 *)get_property(np, "reg", NULL);
125 /* Verify it's an IO port, we don't support anything else */
126 if (!(reg[0] & 0x00000001))
129 /* Now look for an "ibm,aix-loc" property that gives us ordering
132 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
134 /* If we have a location index, then use it */
135 if (typep && *typep == 'S')
136 index = simple_strtol(typep+1, NULL, 0) - 1;
138 /* Translate ISA address */
139 taddr = of_translate_address(np, reg);
141 /* Add port, irq will be dealt with later */
142 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, NO_IRQ);
146 static int __init add_legacy_pci_port(struct device_node *np,
147 struct device_node *pci_dev)
149 phys_addr_t addr, base;
151 int iotype, index = -1;
154 /* We only support ports that have a clock frequency properly
155 * encoded in the device-tree (that is have an fcode). Anything
156 * else can't be used that early and will be normally probed by
157 * the generic 8250_pci driver later on.
159 if (get_property(np, "clock-frequency", NULL) == NULL)
163 /* Get the PCI address. Assume BAR 0 */
164 addrp = of_get_pci_address(pci_dev, 0, NULL);
168 /* We only support BAR 0 for now */
169 iotype = (addrp[0] & 0x02000000) ? UPIO_MEM : UPIO_PORT;
170 addr = of_translate_address(pci_dev, addrp);
172 /* Set the IO base to the same as the translated address for MMIO,
173 * or to the domain local IO base for PIO (it will be fixed up later)
175 if (iotype == UPIO_MEM)
180 /* Try to guess an index... If we have subdevices of the pci dev,
181 * we get to their "reg" property
184 u32 *reg = (u32 *)get_property(np, "reg", NULL);
185 if (reg && (*reg < 4))
186 index = legacy_serial_count + *reg;
189 /* Add port, irq will be dealt with later. We passed a translated
190 * IO port value. It will be fixed up later along with the irq
192 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ);
196 * This is called very early, as part of setup_system() or eventually
197 * setup_arch(), basically before anything else in this file. This function
198 * will try to build a list of all the available 8250-compatible serial ports
199 * in the machine using the Open Firmware device-tree. It currently only deals
200 * with ISA and PCI busses but could be extended. It allows a very early boot
201 * console to be initialized, that list is also used later to provide 8250 with
202 * the machine non-PCI ports and to properly pick the default console port
204 void __init find_legacy_serial_ports(void)
206 struct device_node *np, *stdout;
210 DBG(" -> find_legacy_serial_port()\n");
212 /* Now find out if one of these is out firmware console */
213 path = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
215 DBG(" no linux,stdout-path !\n");
218 stdout = of_find_node_by_path(path);
220 DBG("stdout is %s\n", stdout->full_name);
223 /* First fill our array with ISA ports */
224 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
225 struct device_node *isa = of_get_parent(np);
226 if (isa && !strcmp(isa->name, "isa")) {
227 index = add_legacy_isa_port(np, isa);
228 if (index >= 0 && np == stdout)
229 legacy_serial_console = index;
234 /* Next, try to locate PCI ports */
235 for (np = NULL; (np = of_find_all_nodes(np));) {
236 struct device_node *pci, *parent = of_get_parent(np);
237 if (parent && !strcmp(parent->name, "isa")) {
241 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
245 /* Check for known pciclass, and also check wether we have
246 * a device with child nodes for ports or not
248 if (device_is_compatible(np, "pciclass,0700") ||
249 device_is_compatible(np, "pciclass,070002"))
251 else if (device_is_compatible(parent, "pciclass,0700") ||
252 device_is_compatible(parent, "pciclass,070002"))
258 index = add_legacy_pci_port(np, pci);
259 if (index >= 0 && np == stdout)
260 legacy_serial_console = index;
264 DBG("legacy_serial_console = %d\n", legacy_serial_console);
266 /* udbg is 64 bits only for now, that will change soon though ... */
268 while (legacy_serial_console >= 0) {
269 struct legacy_serial_info *info =
270 &legacy_serial_infos[legacy_serial_console];
273 if (info->taddr == 0)
275 addr = ioremap(info->taddr, 0x1000);
278 if (info->speed == 0)
279 info->speed = udbg_probe_uart_speed(addr, info->clock);
280 DBG("default console speed = %d\n", info->speed);
281 udbg_init_uart(addr, info->speed, info->clock);
284 #endif /* CONFIG_PPC64 */
286 DBG(" <- find_legacy_serial_port()\n");
289 static struct platform_device serial_device = {
290 .name = "serial8250",
291 .id = PLAT8250_DEV_PLATFORM,
293 .platform_data = legacy_serial_ports,
297 static void __init fixup_port_irq(int index,
298 struct device_node *np,
299 struct plat_serial8250_port *port)
301 DBG("fixup_port_irq(%d)\n", index);
303 /* Check for interrupts in that node */
304 if (np->n_intrs > 0) {
305 port->irq = np->intrs[0].line;
306 DBG(" port %d (%s), irq=%d\n",
307 index, np->full_name, port->irq);
311 /* Check for interrupts in the parent */
312 np = of_get_parent(np);
316 if (np->n_intrs > 0) {
317 port->irq = np->intrs[0].line;
318 DBG(" port %d (%s), irq=%d\n",
319 index, np->full_name, port->irq);
324 static void __init fixup_port_pio(int index,
325 struct device_node *np,
326 struct plat_serial8250_port *port)
328 struct pci_controller *hose;
330 DBG("fixup_port_pio(%d)\n", index);
332 hose = pci_find_hose_for_OF_device(np);
334 unsigned long offset = (unsigned long)hose->io_base_virt -
340 DBG("port %d, IO %lx -> %lx\n",
341 index, port->iobase, port->iobase + offset);
342 port->iobase += offset;
347 * This is called as an arch initcall, hopefully before the PCI bus is
348 * probed and/or the 8250 driver loaded since we need to register our
349 * platform devices before 8250 PCI ones are detected as some of them
350 * must properly "override" the platform ones.
352 * This function fixes up the interrupt value for platform ports as it
353 * couldn't be done earlier before interrupt maps have been parsed. It
354 * also "corrects" the IO address for PIO ports for the same reason,
355 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
356 * registers all those platform ports for use by the 8250 driver when it
359 static int __init serial_dev_init(void)
363 if (legacy_serial_count == 0)
367 * Before we register the platfrom serial devices, we need
368 * to fixup their interrutps and their IO ports.
370 DBG("Fixing serial ports interrupts and IO ports ...\n");
372 for (i = 0; i < legacy_serial_count; i++) {
373 struct plat_serial8250_port *port = &legacy_serial_ports[i];
374 struct device_node *np = legacy_serial_infos[i].np;
376 if (port->irq == NO_IRQ)
377 fixup_port_irq(i, np, port);
378 if (port->iotype == UPIO_PORT)
379 fixup_port_pio(i, np, port);
382 DBG("Registering platform serial ports\n");
384 return platform_device_register(&serial_device);
386 arch_initcall(serial_dev_init);
390 * This is called very early, as part of console_init() (typically just after
391 * time_init()). This function is respondible for trying to find a good
392 * default console on serial ports. It tries to match the open firmware
393 * default output with one of the available serial console drivers, either
394 * one of the platform serial ports that have been probed earlier by
395 * find_legacy_serial_ports() or some more platform specific ones.
397 static int __init check_legacy_serial_console(void)
399 struct device_node *prom_stdout = NULL;
400 int speed = 0, offset = 0;
404 DBG(" -> check_legacy_serial_console()\n");
406 /* The user has requested a console so this is already set up. */
407 if (strstr(saved_command_line, "console=")) {
408 DBG(" console was specified !\n");
413 DBG(" of_chosen is NULL !\n");
416 /* We are getting a weird phandle from OF ... */
417 /* ... So use the full path instead */
418 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
420 DBG(" no linux,stdout-path !\n");
423 prom_stdout = of_find_node_by_path(name);
425 DBG(" can't find stdout package %s !\n", name);
428 DBG("stdout is %s\n", prom_stdout->full_name);
430 name = (char *)get_property(prom_stdout, "name", NULL);
432 DBG(" stdout package has no name !\n");
435 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
441 #ifdef CONFIG_SERIAL_8250_CONSOLE
442 else if (strcmp(name, "serial") == 0) {
444 /* Look for it in probed array */
445 for (i = 0; i < legacy_serial_count; i++) {
446 if (prom_stdout != legacy_serial_infos[i].np)
449 speed = legacy_serial_infos[i].speed;
452 if (i >= legacy_serial_count)
455 #endif /* CONFIG_SERIAL_8250_CONSOLE */
456 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
457 else if (strcmp(name, "ch-a") == 0)
459 else if (strcmp(name, "ch-b") == 0)
461 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
464 of_node_put(prom_stdout);
466 DBG("Found serial console at ttyS%d\n", offset);
469 static char __initdata opt[16];
470 sprintf(opt, "%d", speed);
471 return add_preferred_console("ttyS", offset, opt);
473 return add_preferred_console("ttyS", offset, NULL);
476 DBG("No preferred console found !\n");
477 of_node_put(prom_stdout);
480 console_initcall(check_legacy_serial_console);