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
;
32 } legacy_serial_infos
[MAX_LEGACY_SERIAL_PORTS
];
33 static unsigned int legacy_serial_count
;
34 static int legacy_serial_console
= -1;
36 static int __init
add_legacy_port(struct device_node
*np
, int want_index
,
37 int iotype
, phys_addr_t base
,
38 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
= flags
;
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_soc_port(struct device_node
*np
,
111 struct device_node
*soc_dev
)
115 upf_t flags
= UPF_BOOT_AUTOCONF
| UPF_SKIP_TEST
| UPF_SHARE_IRQ
;
117 /* We only support ports that have a clock frequency properly
118 * encoded in the device-tree.
120 if (get_property(np
, "clock-frequency", NULL
) == NULL
)
123 /* Get the address */
124 addrp
= of_get_address(soc_dev
, 0, NULL
, NULL
);
128 addr
= of_translate_address(soc_dev
, addrp
);
129 if (addr
== OF_BAD_ADDR
)
132 /* Add port, irq will be dealt with later. We passed a translated
133 * IO port value. It will be fixed up later along with the irq
135 return add_legacy_port(np
, -1, UPIO_MEM
, addr
, addr
, NO_IRQ
, flags
);
138 static int __init
add_legacy_isa_port(struct device_node
*np
,
139 struct device_node
*isa_brg
)
146 DBG(" -> add_legacy_isa_port(%s)\n", np
->full_name
);
148 /* Get the ISA port number */
149 reg
= (u32
*)get_property(np
, "reg", NULL
);
153 /* Verify it's an IO port, we don't support anything else */
154 if (!(reg
[0] & 0x00000001))
157 /* Now look for an "ibm,aix-loc" property that gives us ordering
160 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
162 /* If we have a location index, then use it */
163 if (typep
&& *typep
== 'S')
164 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
166 /* Translate ISA address */
167 taddr
= of_translate_address(np
, reg
);
168 if (taddr
== OF_BAD_ADDR
)
171 /* Add port, irq will be dealt with later */
172 return add_legacy_port(np
, index
, UPIO_PORT
, reg
[1], taddr
,
173 NO_IRQ
, UPF_BOOT_AUTOCONF
);
178 static int __init
add_legacy_pci_port(struct device_node
*np
,
179 struct device_node
*pci_dev
)
181 phys_addr_t addr
, base
;
184 int iotype
, index
= -1, lindex
= 0;
186 DBG(" -> add_legacy_pci_port(%s)\n", np
->full_name
);
188 /* We only support ports that have a clock frequency properly
189 * encoded in the device-tree (that is have an fcode). Anything
190 * else can't be used that early and will be normally probed by
191 * the generic 8250_pci driver later on. The reason is that 8250
192 * compatible UARTs on PCI need all sort of quirks (port offsets
193 * etc...) that this code doesn't know about
195 if (get_property(np
, "clock-frequency", NULL
) == NULL
)
198 /* Get the PCI address. Assume BAR 0 */
199 addrp
= of_get_pci_address(pci_dev
, 0, NULL
, &flags
);
203 /* We only support BAR 0 for now */
204 iotype
= (flags
& IORESOURCE_MEM
) ? UPIO_MEM
: UPIO_PORT
;
205 addr
= of_translate_address(pci_dev
, addrp
);
206 if (addr
== OF_BAD_ADDR
)
209 /* Set the IO base to the same as the translated address for MMIO,
210 * or to the domain local IO base for PIO (it will be fixed up later)
212 if (iotype
== UPIO_MEM
)
217 /* Try to guess an index... If we have subdevices of the pci dev,
218 * we get to their "reg" property
221 u32
*reg
= (u32
*)get_property(np
, "reg", NULL
);
222 if (reg
&& (*reg
< 4))
223 index
= lindex
= *reg
;
226 /* Local index means it's the Nth port in the PCI chip. Unfortunately
227 * the offset to add here is device specific. We know about those
228 * EXAR ports and we default to the most common case. If your UART
229 * doesn't work for these settings, you'll have to add your own special
232 if (device_is_compatible(pci_dev
, "pci13a8,152") ||
233 device_is_compatible(pci_dev
, "pci13a8,154") ||
234 device_is_compatible(pci_dev
, "pci13a8,158")) {
235 addr
+= 0x200 * lindex
;
236 base
+= 0x200 * lindex
;
242 /* Add port, irq will be dealt with later. We passed a translated
243 * IO port value. It will be fixed up later along with the irq
245 return add_legacy_port(np
, index
, iotype
, base
, addr
, NO_IRQ
, UPF_BOOT_AUTOCONF
);
249 static void __init
setup_legacy_serial_console(int console
)
251 struct legacy_serial_info
*info
=
252 &legacy_serial_infos
[console
];
255 if (info
->taddr
== 0)
257 addr
= ioremap(info
->taddr
, 0x1000);
260 if (info
->speed
== 0)
261 info
->speed
= udbg_probe_uart_speed(addr
, info
->clock
);
262 DBG("default console speed = %d\n", info
->speed
);
263 udbg_init_uart(addr
, info
->speed
, info
->clock
);
267 * This is called very early, as part of setup_system() or eventually
268 * setup_arch(), basically before anything else in this file. This function
269 * will try to build a list of all the available 8250-compatible serial ports
270 * in the machine using the Open Firmware device-tree. It currently only deals
271 * with ISA and PCI busses but could be extended. It allows a very early boot
272 * console to be initialized, that list is also used later to provide 8250 with
273 * the machine non-PCI ports and to properly pick the default console port
275 void __init
find_legacy_serial_ports(void)
277 struct device_node
*np
, *stdout
= NULL
;
281 DBG(" -> find_legacy_serial_port()\n");
283 /* Now find out if one of these is out firmware console */
284 path
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
286 stdout
= of_find_node_by_path(path
);
288 DBG("stdout is %s\n", stdout
->full_name
);
290 DBG(" no linux,stdout-path !\n");
293 /* First fill our array with SOC ports */
294 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16550")) != NULL
;) {
295 struct device_node
*soc
= of_get_parent(np
);
296 if (soc
&& !strcmp(soc
->type
, "soc")) {
297 index
= add_legacy_soc_port(np
, np
);
298 if (index
>= 0 && np
== stdout
)
299 legacy_serial_console
= index
;
304 /* First fill our array with ISA ports */
305 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
306 struct device_node
*isa
= of_get_parent(np
);
307 if (isa
&& !strcmp(isa
->name
, "isa")) {
308 index
= add_legacy_isa_port(np
, isa
);
309 if (index
>= 0 && np
== stdout
)
310 legacy_serial_console
= index
;
315 /* First fill our array with tsi-bridge ports */
316 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16550")) != NULL
;) {
317 struct device_node
*tsi
= of_get_parent(np
);
318 if (tsi
&& !strcmp(tsi
->type
, "tsi-bridge")) {
319 index
= add_legacy_soc_port(np
, np
);
320 if (index
>= 0 && np
== stdout
)
321 legacy_serial_console
= index
;
327 /* Next, try to locate PCI ports */
328 for (np
= NULL
; (np
= of_find_all_nodes(np
));) {
329 struct device_node
*pci
, *parent
= of_get_parent(np
);
330 if (parent
&& !strcmp(parent
->name
, "isa")) {
334 if (strcmp(np
->name
, "serial") && strcmp(np
->type
, "serial")) {
338 /* Check for known pciclass, and also check wether we have
339 * a device with child nodes for ports or not
341 if (device_is_compatible(np
, "pciclass,0700") ||
342 device_is_compatible(np
, "pciclass,070002"))
344 else if (device_is_compatible(parent
, "pciclass,0700") ||
345 device_is_compatible(parent
, "pciclass,070002"))
351 index
= add_legacy_pci_port(np
, pci
);
352 if (index
>= 0 && np
== stdout
)
353 legacy_serial_console
= index
;
358 DBG("legacy_serial_console = %d\n", legacy_serial_console
);
359 if (legacy_serial_console
>= 0)
360 setup_legacy_serial_console(legacy_serial_console
);
361 DBG(" <- find_legacy_serial_port()\n");
364 static struct platform_device serial_device
= {
365 .name
= "serial8250",
366 .id
= PLAT8250_DEV_PLATFORM
,
368 .platform_data
= legacy_serial_ports
,
372 static void __init
fixup_port_irq(int index
,
373 struct device_node
*np
,
374 struct plat_serial8250_port
*port
)
376 DBG("fixup_port_irq(%d)\n", index
);
378 /* Check for interrupts in that node */
379 if (np
->n_intrs
> 0) {
380 port
->irq
= np
->intrs
[0].line
;
381 DBG(" port %d (%s), irq=%d\n",
382 index
, np
->full_name
, port
->irq
);
386 /* Check for interrupts in the parent */
387 np
= of_get_parent(np
);
391 if (np
->n_intrs
> 0) {
392 port
->irq
= np
->intrs
[0].line
;
393 DBG(" port %d (%s), irq=%d\n",
394 index
, np
->full_name
, port
->irq
);
399 static void __init
fixup_port_pio(int index
,
400 struct device_node
*np
,
401 struct plat_serial8250_port
*port
)
404 struct pci_controller
*hose
;
406 DBG("fixup_port_pio(%d)\n", index
);
408 hose
= pci_find_hose_for_OF_device(np
);
410 unsigned long offset
= (unsigned long)hose
->io_base_virt
-
416 DBG("port %d, IO %lx -> %lx\n",
417 index
, port
->iobase
, port
->iobase
+ offset
);
418 port
->iobase
+= offset
;
423 static void __init
fixup_port_mmio(int index
,
424 struct device_node
*np
,
425 struct plat_serial8250_port
*port
)
427 DBG("fixup_port_mmio(%d)\n", index
);
429 port
->membase
= ioremap(port
->mapbase
, 0x100);
433 * This is called as an arch initcall, hopefully before the PCI bus is
434 * probed and/or the 8250 driver loaded since we need to register our
435 * platform devices before 8250 PCI ones are detected as some of them
436 * must properly "override" the platform ones.
438 * This function fixes up the interrupt value for platform ports as it
439 * couldn't be done earlier before interrupt maps have been parsed. It
440 * also "corrects" the IO address for PIO ports for the same reason,
441 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
442 * registers all those platform ports for use by the 8250 driver when it
445 static int __init
serial_dev_init(void)
449 if (legacy_serial_count
== 0)
453 * Before we register the platfrom serial devices, we need
454 * to fixup their interrutps and their IO ports.
456 DBG("Fixing serial ports interrupts and IO ports ...\n");
458 for (i
= 0; i
< legacy_serial_count
; i
++) {
459 struct plat_serial8250_port
*port
= &legacy_serial_ports
[i
];
460 struct device_node
*np
= legacy_serial_infos
[i
].np
;
462 if (port
->irq
== NO_IRQ
)
463 fixup_port_irq(i
, np
, port
);
464 if (port
->iotype
== UPIO_PORT
)
465 fixup_port_pio(i
, np
, port
);
466 if (port
->iotype
== UPIO_MEM
)
467 fixup_port_mmio(i
, np
, port
);
470 DBG("Registering platform serial ports\n");
472 return platform_device_register(&serial_device
);
474 arch_initcall(serial_dev_init
);
478 * This is called very early, as part of console_init() (typically just after
479 * time_init()). This function is respondible for trying to find a good
480 * default console on serial ports. It tries to match the open firmware
481 * default output with one of the available serial console drivers, either
482 * one of the platform serial ports that have been probed earlier by
483 * find_legacy_serial_ports() or some more platform specific ones.
485 static int __init
check_legacy_serial_console(void)
487 struct device_node
*prom_stdout
= NULL
;
488 int speed
= 0, offset
= 0;
492 DBG(" -> check_legacy_serial_console()\n");
494 /* The user has requested a console so this is already set up. */
495 if (strstr(saved_command_line
, "console=")) {
496 DBG(" console was specified !\n");
501 DBG(" of_chosen is NULL !\n");
505 if (legacy_serial_console
< 0) {
506 DBG(" legacy_serial_console not found !\n");
509 /* We are getting a weird phandle from OF ... */
510 /* ... So use the full path instead */
511 name
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
513 DBG(" no linux,stdout-path !\n");
516 prom_stdout
= of_find_node_by_path(name
);
518 DBG(" can't find stdout package %s !\n", name
);
521 DBG("stdout is %s\n", prom_stdout
->full_name
);
523 name
= (char *)get_property(prom_stdout
, "name", NULL
);
525 DBG(" stdout package has no name !\n");
528 spd
= (u32
*)get_property(prom_stdout
, "current-speed", NULL
);
534 #ifdef CONFIG_SERIAL_8250_CONSOLE
535 else if (strcmp(name
, "serial") == 0) {
537 /* Look for it in probed array */
538 for (i
= 0; i
< legacy_serial_count
; i
++) {
539 if (prom_stdout
!= legacy_serial_infos
[i
].np
)
542 speed
= legacy_serial_infos
[i
].speed
;
545 if (i
>= legacy_serial_count
)
548 #endif /* CONFIG_SERIAL_8250_CONSOLE */
549 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
550 else if (strcmp(name
, "ch-a") == 0)
552 else if (strcmp(name
, "ch-b") == 0)
554 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
557 of_node_put(prom_stdout
);
559 DBG("Found serial console at ttyS%d\n", offset
);
562 static char __initdata opt
[16];
563 sprintf(opt
, "%d", speed
);
564 return add_preferred_console("ttyS", offset
, opt
);
566 return add_preferred_console("ttyS", offset
, NULL
);
569 DBG("No preferred console found !\n");
570 of_node_put(prom_stdout
);
573 console_initcall(check_legacy_serial_console
);