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
;
119 struct device_node
*tsi
= of_get_parent(np
);
121 /* We only support ports that have a clock frequency properly
122 * encoded in the device-tree.
124 if (get_property(np
, "clock-frequency", NULL
) == NULL
)
127 /* if rtas uses this device, don't try to use it as well */
128 if (get_property(np
, "used-by-rtas", NULL
) != NULL
)
131 /* Get the address */
132 addrp
= of_get_address(soc_dev
, 0, NULL
, NULL
);
136 addr
= of_translate_address(soc_dev
, addrp
);
137 if (addr
== OF_BAD_ADDR
)
140 /* Add port, irq will be dealt with later. We passed a translated
141 * IO port value. It will be fixed up later along with the irq
143 if (tsi
&& !strcmp(tsi
->type
, "tsi-bridge"))
144 return add_legacy_port(np
, -1, UPIO_TSI
, addr
, addr
, NO_IRQ
, flags
, 0);
146 return add_legacy_port(np
, -1, UPIO_MEM
, addr
, addr
, NO_IRQ
, flags
, 0);
149 static int __init
add_legacy_isa_port(struct device_node
*np
,
150 struct device_node
*isa_brg
)
157 DBG(" -> add_legacy_isa_port(%s)\n", np
->full_name
);
159 /* Get the ISA port number */
160 reg
= get_property(np
, "reg", NULL
);
164 /* Verify it's an IO port, we don't support anything else */
165 if (!(reg
[0] & 0x00000001))
168 /* Now look for an "ibm,aix-loc" property that gives us ordering
171 typep
= get_property(np
, "ibm,aix-loc", NULL
);
173 /* If we have a location index, then use it */
174 if (typep
&& *typep
== 'S')
175 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
177 /* Translate ISA address. If it fails, we still register the port
178 * with no translated address so that it can be picked up as an IO
179 * port later by the serial driver
181 taddr
= of_translate_address(np
, reg
);
182 if (taddr
== OF_BAD_ADDR
)
185 /* Add port, irq will be dealt with later */
186 return add_legacy_port(np
, index
, UPIO_PORT
, reg
[1], taddr
,
187 NO_IRQ
, UPF_BOOT_AUTOCONF
, 0);
192 static int __init
add_legacy_pci_port(struct device_node
*np
,
193 struct device_node
*pci_dev
)
198 int iotype
, index
= -1, lindex
= 0;
200 DBG(" -> add_legacy_pci_port(%s)\n", np
->full_name
);
202 /* We only support ports that have a clock frequency properly
203 * encoded in the device-tree (that is have an fcode). Anything
204 * else can't be used that early and will be normally probed by
205 * the generic 8250_pci driver later on. The reason is that 8250
206 * compatible UARTs on PCI need all sort of quirks (port offsets
207 * etc...) that this code doesn't know about
209 if (get_property(np
, "clock-frequency", NULL
) == NULL
)
212 /* Get the PCI address. Assume BAR 0 */
213 addrp
= of_get_pci_address(pci_dev
, 0, NULL
, &flags
);
217 /* We only support BAR 0 for now */
218 iotype
= (flags
& IORESOURCE_MEM
) ? UPIO_MEM
: UPIO_PORT
;
219 addr
= of_translate_address(pci_dev
, addrp
);
220 if (addr
== OF_BAD_ADDR
)
223 /* Set the IO base to the same as the translated address for MMIO,
224 * or to the domain local IO base for PIO (it will be fixed up later)
226 if (iotype
== UPIO_MEM
)
231 /* Try to guess an index... If we have subdevices of the pci dev,
232 * we get to their "reg" property
235 const u32
*reg
= get_property(np
, "reg", NULL
);
236 if (reg
&& (*reg
< 4))
237 index
= lindex
= *reg
;
240 /* Local index means it's the Nth port in the PCI chip. Unfortunately
241 * the offset to add here is device specific. We know about those
242 * EXAR ports and we default to the most common case. If your UART
243 * doesn't work for these settings, you'll have to add your own special
246 if (device_is_compatible(pci_dev
, "pci13a8,152") ||
247 device_is_compatible(pci_dev
, "pci13a8,154") ||
248 device_is_compatible(pci_dev
, "pci13a8,158")) {
249 addr
+= 0x200 * lindex
;
250 base
+= 0x200 * lindex
;
256 /* Add port, irq will be dealt with later. We passed a translated
257 * IO port value. It will be fixed up later along with the irq
259 return add_legacy_port(np
, index
, iotype
, base
, addr
, NO_IRQ
,
260 UPF_BOOT_AUTOCONF
, np
!= pci_dev
);
264 static void __init
setup_legacy_serial_console(int console
)
266 struct legacy_serial_info
*info
=
267 &legacy_serial_infos
[console
];
270 if (info
->taddr
== 0)
272 addr
= ioremap(info
->taddr
, 0x1000);
275 if (info
->speed
== 0)
276 info
->speed
= udbg_probe_uart_speed(addr
, info
->clock
);
277 DBG("default console speed = %d\n", info
->speed
);
278 udbg_init_uart(addr
, info
->speed
, info
->clock
);
282 * This is called very early, as part of setup_system() or eventually
283 * setup_arch(), basically before anything else in this file. This function
284 * will try to build a list of all the available 8250-compatible serial ports
285 * in the machine using the Open Firmware device-tree. It currently only deals
286 * with ISA and PCI busses but could be extended. It allows a very early boot
287 * console to be initialized, that list is also used later to provide 8250 with
288 * the machine non-PCI ports and to properly pick the default console port
290 void __init
find_legacy_serial_ports(void)
292 struct device_node
*np
, *stdout
= NULL
;
296 DBG(" -> find_legacy_serial_port()\n");
298 /* Now find out if one of these is out firmware console */
299 path
= get_property(of_chosen
, "linux,stdout-path", NULL
);
301 stdout
= of_find_node_by_path(path
);
303 DBG("stdout is %s\n", stdout
->full_name
);
305 DBG(" no linux,stdout-path !\n");
308 /* First fill our array with SOC ports */
309 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16550")) != NULL
;) {
310 struct device_node
*soc
= of_get_parent(np
);
311 if (soc
&& !strcmp(soc
->type
, "soc")) {
312 index
= add_legacy_soc_port(np
, np
);
313 if (index
>= 0 && np
== stdout
)
314 legacy_serial_console
= index
;
319 /* First fill our array with ISA ports */
320 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
321 struct device_node
*isa
= of_get_parent(np
);
322 if (isa
&& !strcmp(isa
->name
, "isa")) {
323 index
= add_legacy_isa_port(np
, isa
);
324 if (index
>= 0 && np
== stdout
)
325 legacy_serial_console
= index
;
330 /* First fill our array with tsi-bridge ports */
331 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16550")) != NULL
;) {
332 struct device_node
*tsi
= of_get_parent(np
);
333 if (tsi
&& !strcmp(tsi
->type
, "tsi-bridge")) {
334 index
= add_legacy_soc_port(np
, np
);
335 if (index
>= 0 && np
== stdout
)
336 legacy_serial_console
= index
;
341 /* First fill our array with opb bus ports */
342 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16750")) != NULL
;) {
343 struct device_node
*opb
= of_get_parent(np
);
344 if (opb
&& !strcmp(opb
->type
, "opb")) {
345 index
= add_legacy_soc_port(np
, np
);
346 if (index
>= 0 && np
== stdout
)
347 legacy_serial_console
= index
;
353 /* Next, try to locate PCI ports */
354 for (np
= NULL
; (np
= of_find_all_nodes(np
));) {
355 struct device_node
*pci
, *parent
= of_get_parent(np
);
356 if (parent
&& !strcmp(parent
->name
, "isa")) {
360 if (strcmp(np
->name
, "serial") && strcmp(np
->type
, "serial")) {
364 /* Check for known pciclass, and also check wether we have
365 * a device with child nodes for ports or not
367 if (device_is_compatible(np
, "pciclass,0700") ||
368 device_is_compatible(np
, "pciclass,070002"))
370 else if (device_is_compatible(parent
, "pciclass,0700") ||
371 device_is_compatible(parent
, "pciclass,070002"))
377 index
= add_legacy_pci_port(np
, pci
);
378 if (index
>= 0 && np
== stdout
)
379 legacy_serial_console
= index
;
384 DBG("legacy_serial_console = %d\n", legacy_serial_console
);
385 if (legacy_serial_console
>= 0)
386 setup_legacy_serial_console(legacy_serial_console
);
387 DBG(" <- find_legacy_serial_port()\n");
390 static struct platform_device serial_device
= {
391 .name
= "serial8250",
392 .id
= PLAT8250_DEV_PLATFORM
,
394 .platform_data
= legacy_serial_ports
,
398 static void __init
fixup_port_irq(int index
,
399 struct device_node
*np
,
400 struct plat_serial8250_port
*port
)
404 DBG("fixup_port_irq(%d)\n", index
);
406 virq
= irq_of_parse_and_map(np
, 0);
407 if (virq
== NO_IRQ
&& legacy_serial_infos
[index
].irq_check_parent
) {
408 np
= of_get_parent(np
);
411 virq
= irq_of_parse_and_map(np
, 0);
420 static void __init
fixup_port_pio(int index
,
421 struct device_node
*np
,
422 struct plat_serial8250_port
*port
)
425 struct pci_controller
*hose
;
427 DBG("fixup_port_pio(%d)\n", index
);
429 hose
= pci_find_hose_for_OF_device(np
);
431 unsigned long offset
= (unsigned long)hose
->io_base_virt
-
437 DBG("port %d, IO %lx -> %lx\n",
438 index
, port
->iobase
, port
->iobase
+ offset
);
439 port
->iobase
+= offset
;
444 static void __init
fixup_port_mmio(int index
,
445 struct device_node
*np
,
446 struct plat_serial8250_port
*port
)
448 DBG("fixup_port_mmio(%d)\n", index
);
450 port
->membase
= ioremap(port
->mapbase
, 0x100);
454 * This is called as an arch initcall, hopefully before the PCI bus is
455 * probed and/or the 8250 driver loaded since we need to register our
456 * platform devices before 8250 PCI ones are detected as some of them
457 * must properly "override" the platform ones.
459 * This function fixes up the interrupt value for platform ports as it
460 * couldn't be done earlier before interrupt maps have been parsed. It
461 * also "corrects" the IO address for PIO ports for the same reason,
462 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
463 * registers all those platform ports for use by the 8250 driver when it
466 static int __init
serial_dev_init(void)
470 if (legacy_serial_count
== 0)
474 * Before we register the platfrom serial devices, we need
475 * to fixup their interrutps and their IO ports.
477 DBG("Fixing serial ports interrupts and IO ports ...\n");
479 for (i
= 0; i
< legacy_serial_count
; i
++) {
480 struct plat_serial8250_port
*port
= &legacy_serial_ports
[i
];
481 struct device_node
*np
= legacy_serial_infos
[i
].np
;
483 if (port
->irq
== NO_IRQ
)
484 fixup_port_irq(i
, np
, port
);
485 if (port
->iotype
== UPIO_PORT
)
486 fixup_port_pio(i
, np
, port
);
487 if ((port
->iotype
== UPIO_MEM
) || (port
->iotype
== UPIO_TSI
))
488 fixup_port_mmio(i
, np
, port
);
491 DBG("Registering platform serial ports\n");
493 return platform_device_register(&serial_device
);
495 arch_initcall(serial_dev_init
);
499 * This is called very early, as part of console_init() (typically just after
500 * time_init()). This function is respondible for trying to find a good
501 * default console on serial ports. It tries to match the open firmware
502 * default output with one of the available serial console drivers, either
503 * one of the platform serial ports that have been probed earlier by
504 * find_legacy_serial_ports() or some more platform specific ones.
506 static int __init
check_legacy_serial_console(void)
508 struct device_node
*prom_stdout
= NULL
;
509 int speed
= 0, offset
= 0;
513 DBG(" -> check_legacy_serial_console()\n");
515 /* The user has requested a console so this is already set up. */
516 if (strstr(boot_command_line
, "console=")) {
517 DBG(" console was specified !\n");
522 DBG(" of_chosen is NULL !\n");
526 if (legacy_serial_console
< 0) {
527 DBG(" legacy_serial_console not found !\n");
530 /* We are getting a weird phandle from OF ... */
531 /* ... So use the full path instead */
532 name
= get_property(of_chosen
, "linux,stdout-path", NULL
);
534 DBG(" no linux,stdout-path !\n");
537 prom_stdout
= of_find_node_by_path(name
);
539 DBG(" can't find stdout package %s !\n", name
);
542 DBG("stdout is %s\n", prom_stdout
->full_name
);
544 name
= get_property(prom_stdout
, "name", NULL
);
546 DBG(" stdout package has no name !\n");
549 spd
= get_property(prom_stdout
, "current-speed", NULL
);
555 #ifdef CONFIG_SERIAL_8250_CONSOLE
556 else if (strcmp(name
, "serial") == 0) {
558 /* Look for it in probed array */
559 for (i
= 0; i
< legacy_serial_count
; i
++) {
560 if (prom_stdout
!= legacy_serial_infos
[i
].np
)
563 speed
= legacy_serial_infos
[i
].speed
;
566 if (i
>= legacy_serial_count
)
569 #endif /* CONFIG_SERIAL_8250_CONSOLE */
570 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
571 else if (strcmp(name
, "ch-a") == 0)
573 else if (strcmp(name
, "ch-b") == 0)
575 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
578 of_node_put(prom_stdout
);
580 DBG("Found serial console at ttyS%d\n", offset
);
583 static char __initdata opt
[16];
584 sprintf(opt
, "%d", speed
);
585 return add_preferred_console("ttyS", offset
, opt
);
587 return add_preferred_console("ttyS", offset
, NULL
);
590 DBG("No preferred console found !\n");
591 of_node_put(prom_stdout
);
594 console_initcall(check_legacy_serial_console
);