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
);
130 /* Add port, irq will be dealt with later. We passed a translated
131 * IO port value. It will be fixed up later along with the irq
133 return add_legacy_port(np
, -1, UPIO_MEM
, addr
, addr
, NO_IRQ
, flags
);
136 static int __init
add_legacy_isa_port(struct device_node
*np
,
137 struct device_node
*isa_brg
)
144 /* Get the ISA port number */
145 reg
= (u32
*)get_property(np
, "reg", NULL
);
149 /* Verify it's an IO port, we don't support anything else */
150 if (!(reg
[0] & 0x00000001))
153 /* Now look for an "ibm,aix-loc" property that gives us ordering
156 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
158 /* If we have a location index, then use it */
159 if (typep
&& *typep
== 'S')
160 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
162 /* Translate ISA address */
163 taddr
= of_translate_address(np
, reg
);
165 /* Add port, irq will be dealt with later */
166 return add_legacy_port(np
, index
, UPIO_PORT
, reg
[1], taddr
, NO_IRQ
, UPF_BOOT_AUTOCONF
);
171 static int __init
add_legacy_pci_port(struct device_node
*np
,
172 struct device_node
*pci_dev
)
174 phys_addr_t addr
, base
;
177 int iotype
, index
= -1, lindex
= 0;
179 /* We only support ports that have a clock frequency properly
180 * encoded in the device-tree (that is have an fcode). Anything
181 * else can't be used that early and will be normally probed by
182 * the generic 8250_pci driver later on. The reason is that 8250
183 * compatible UARTs on PCI need all sort of quirks (port offsets
184 * etc...) that this code doesn't know about
186 if (get_property(np
, "clock-frequency", NULL
) == NULL
)
189 /* Get the PCI address. Assume BAR 0 */
190 addrp
= of_get_pci_address(pci_dev
, 0, NULL
, &flags
);
194 /* We only support BAR 0 for now */
195 iotype
= (flags
& IORESOURCE_MEM
) ? UPIO_MEM
: UPIO_PORT
;
196 addr
= of_translate_address(pci_dev
, addrp
);
198 /* Set the IO base to the same as the translated address for MMIO,
199 * or to the domain local IO base for PIO (it will be fixed up later)
201 if (iotype
== UPIO_MEM
)
206 /* Try to guess an index... If we have subdevices of the pci dev,
207 * we get to their "reg" property
210 u32
*reg
= (u32
*)get_property(np
, "reg", NULL
);
211 if (reg
&& (*reg
< 4))
212 index
= lindex
= *reg
;
215 /* Local index means it's the Nth port in the PCI chip. Unfortunately
216 * the offset to add here is device specific. We know about those
217 * EXAR ports and we default to the most common case. If your UART
218 * doesn't work for these settings, you'll have to add your own special
221 if (device_is_compatible(pci_dev
, "pci13a8,152") ||
222 device_is_compatible(pci_dev
, "pci13a8,154") ||
223 device_is_compatible(pci_dev
, "pci13a8,158")) {
224 addr
+= 0x200 * lindex
;
225 base
+= 0x200 * lindex
;
231 /* Add port, irq will be dealt with later. We passed a translated
232 * IO port value. It will be fixed up later along with the irq
234 return add_legacy_port(np
, index
, iotype
, base
, addr
, NO_IRQ
, UPF_BOOT_AUTOCONF
);
238 static void __init
setup_legacy_serial_console(int console
)
240 struct legacy_serial_info
*info
=
241 &legacy_serial_infos
[console
];
244 if (info
->taddr
== 0)
246 addr
= ioremap(info
->taddr
, 0x1000);
249 if (info
->speed
== 0)
250 info
->speed
= udbg_probe_uart_speed(addr
, info
->clock
);
251 DBG("default console speed = %d\n", info
->speed
);
252 udbg_init_uart(addr
, info
->speed
, info
->clock
);
256 * This is called very early, as part of setup_system() or eventually
257 * setup_arch(), basically before anything else in this file. This function
258 * will try to build a list of all the available 8250-compatible serial ports
259 * in the machine using the Open Firmware device-tree. It currently only deals
260 * with ISA and PCI busses but could be extended. It allows a very early boot
261 * console to be initialized, that list is also used later to provide 8250 with
262 * the machine non-PCI ports and to properly pick the default console port
264 void __init
find_legacy_serial_ports(void)
266 struct device_node
*np
, *stdout
= NULL
;
270 DBG(" -> find_legacy_serial_port()\n");
272 /* Now find out if one of these is out firmware console */
273 path
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
275 stdout
= of_find_node_by_path(path
);
277 DBG("stdout is %s\n", stdout
->full_name
);
279 DBG(" no linux,stdout-path !\n");
282 /* First fill our array with SOC ports */
283 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16550")) != NULL
;) {
284 struct device_node
*soc
= of_get_parent(np
);
285 if (soc
&& !strcmp(soc
->type
, "soc")) {
286 index
= add_legacy_soc_port(np
, np
);
287 if (index
>= 0 && np
== stdout
)
288 legacy_serial_console
= index
;
293 /* First fill our array with ISA ports */
294 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
295 struct device_node
*isa
= of_get_parent(np
);
296 if (isa
&& !strcmp(isa
->name
, "isa")) {
297 index
= add_legacy_isa_port(np
, isa
);
298 if (index
>= 0 && np
== stdout
)
299 legacy_serial_console
= index
;
304 /* First fill our array with tsi-bridge ports */
305 for (np
= NULL
; (np
= of_find_compatible_node(np
, "serial", "ns16550")) != NULL
;) {
306 struct device_node
*tsi
= of_get_parent(np
);
307 if (tsi
&& !strcmp(tsi
->type
, "tsi-bridge")) {
308 index
= add_legacy_soc_port(np
, np
);
309 if (index
>= 0 && np
== stdout
)
310 legacy_serial_console
= index
;
316 /* Next, try to locate PCI ports */
317 for (np
= NULL
; (np
= of_find_all_nodes(np
));) {
318 struct device_node
*pci
, *parent
= of_get_parent(np
);
319 if (parent
&& !strcmp(parent
->name
, "isa")) {
323 if (strcmp(np
->name
, "serial") && strcmp(np
->type
, "serial")) {
327 /* Check for known pciclass, and also check wether we have
328 * a device with child nodes for ports or not
330 if (device_is_compatible(np
, "pciclass,0700") ||
331 device_is_compatible(np
, "pciclass,070002"))
333 else if (device_is_compatible(parent
, "pciclass,0700") ||
334 device_is_compatible(parent
, "pciclass,070002"))
340 index
= add_legacy_pci_port(np
, pci
);
341 if (index
>= 0 && np
== stdout
)
342 legacy_serial_console
= index
;
347 DBG("legacy_serial_console = %d\n", legacy_serial_console
);
348 if (legacy_serial_console
>= 0)
349 setup_legacy_serial_console(legacy_serial_console
);
350 DBG(" <- find_legacy_serial_port()\n");
353 static struct platform_device serial_device
= {
354 .name
= "serial8250",
355 .id
= PLAT8250_DEV_PLATFORM
,
357 .platform_data
= legacy_serial_ports
,
361 static void __init
fixup_port_irq(int index
,
362 struct device_node
*np
,
363 struct plat_serial8250_port
*port
)
365 DBG("fixup_port_irq(%d)\n", index
);
367 /* Check for interrupts in that node */
368 if (np
->n_intrs
> 0) {
369 port
->irq
= np
->intrs
[0].line
;
370 DBG(" port %d (%s), irq=%d\n",
371 index
, np
->full_name
, port
->irq
);
375 /* Check for interrupts in the parent */
376 np
= of_get_parent(np
);
380 if (np
->n_intrs
> 0) {
381 port
->irq
= np
->intrs
[0].line
;
382 DBG(" port %d (%s), irq=%d\n",
383 index
, np
->full_name
, port
->irq
);
388 static void __init
fixup_port_pio(int index
,
389 struct device_node
*np
,
390 struct plat_serial8250_port
*port
)
393 struct pci_controller
*hose
;
395 DBG("fixup_port_pio(%d)\n", index
);
397 hose
= pci_find_hose_for_OF_device(np
);
399 unsigned long offset
= (unsigned long)hose
->io_base_virt
-
405 DBG("port %d, IO %lx -> %lx\n",
406 index
, port
->iobase
, port
->iobase
+ offset
);
407 port
->iobase
+= offset
;
412 static void __init
fixup_port_mmio(int index
,
413 struct device_node
*np
,
414 struct plat_serial8250_port
*port
)
416 DBG("fixup_port_mmio(%d)\n", index
);
418 port
->membase
= ioremap(port
->mapbase
, 0x100);
422 * This is called as an arch initcall, hopefully before the PCI bus is
423 * probed and/or the 8250 driver loaded since we need to register our
424 * platform devices before 8250 PCI ones are detected as some of them
425 * must properly "override" the platform ones.
427 * This function fixes up the interrupt value for platform ports as it
428 * couldn't be done earlier before interrupt maps have been parsed. It
429 * also "corrects" the IO address for PIO ports for the same reason,
430 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
431 * registers all those platform ports for use by the 8250 driver when it
434 static int __init
serial_dev_init(void)
438 if (legacy_serial_count
== 0)
442 * Before we register the platfrom serial devices, we need
443 * to fixup their interrutps and their IO ports.
445 DBG("Fixing serial ports interrupts and IO ports ...\n");
447 for (i
= 0; i
< legacy_serial_count
; i
++) {
448 struct plat_serial8250_port
*port
= &legacy_serial_ports
[i
];
449 struct device_node
*np
= legacy_serial_infos
[i
].np
;
451 if (port
->irq
== NO_IRQ
)
452 fixup_port_irq(i
, np
, port
);
453 if (port
->iotype
== UPIO_PORT
)
454 fixup_port_pio(i
, np
, port
);
455 if (port
->iotype
== UPIO_MEM
)
456 fixup_port_mmio(i
, np
, port
);
459 DBG("Registering platform serial ports\n");
461 return platform_device_register(&serial_device
);
463 arch_initcall(serial_dev_init
);
467 * This is called very early, as part of console_init() (typically just after
468 * time_init()). This function is respondible for trying to find a good
469 * default console on serial ports. It tries to match the open firmware
470 * default output with one of the available serial console drivers, either
471 * one of the platform serial ports that have been probed earlier by
472 * find_legacy_serial_ports() or some more platform specific ones.
474 static int __init
check_legacy_serial_console(void)
476 struct device_node
*prom_stdout
= NULL
;
477 int speed
= 0, offset
= 0;
481 DBG(" -> check_legacy_serial_console()\n");
483 /* The user has requested a console so this is already set up. */
484 if (strstr(saved_command_line
, "console=")) {
485 DBG(" console was specified !\n");
490 DBG(" of_chosen is NULL !\n");
494 if (legacy_serial_console
< 0) {
495 DBG(" legacy_serial_console not found !\n");
498 /* We are getting a weird phandle from OF ... */
499 /* ... So use the full path instead */
500 name
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
502 DBG(" no linux,stdout-path !\n");
505 prom_stdout
= of_find_node_by_path(name
);
507 DBG(" can't find stdout package %s !\n", name
);
510 DBG("stdout is %s\n", prom_stdout
->full_name
);
512 name
= (char *)get_property(prom_stdout
, "name", NULL
);
514 DBG(" stdout package has no name !\n");
517 spd
= (u32
*)get_property(prom_stdout
, "current-speed", NULL
);
523 #ifdef CONFIG_SERIAL_8250_CONSOLE
524 else if (strcmp(name
, "serial") == 0) {
526 /* Look for it in probed array */
527 for (i
= 0; i
< legacy_serial_count
; i
++) {
528 if (prom_stdout
!= legacy_serial_infos
[i
].np
)
531 speed
= legacy_serial_infos
[i
].speed
;
534 if (i
>= legacy_serial_count
)
537 #endif /* CONFIG_SERIAL_8250_CONSOLE */
538 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
539 else if (strcmp(name
, "ch-a") == 0)
541 else if (strcmp(name
, "ch-b") == 0)
543 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
546 of_node_put(prom_stdout
);
548 DBG("Found serial console at ttyS%d\n", offset
);
551 static char __initdata opt
[16];
552 sprintf(opt
, "%d", speed
);
553 return add_preferred_console("ttyS", offset
, opt
);
555 return add_preferred_console("ttyS", offset
, NULL
);
558 DBG("No preferred console found !\n");
559 of_node_put(prom_stdout
);
562 console_initcall(check_legacy_serial_console
);