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
);