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
);
46 clock
= clk
? *clk
: BASE_BAUD
* 16;
48 /* get default speed if present */
49 spd
= (u32
*)get_property(np
, "current-speed", NULL
);
51 /* If we have a location index, then try to use it */
52 if (want_index
>= 0 && want_index
< MAX_LEGACY_SERIAL_PORTS
)
55 index
= legacy_serial_count
;
57 /* if our index is still out of range, that mean that
58 * array is full, we could scan for a free slot but that
59 * make little sense to bother, just skip the port
61 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
63 if (index
>= legacy_serial_count
)
64 legacy_serial_count
= index
+ 1;
66 /* Check if there is a port who already claimed our slot */
67 if (legacy_serial_infos
[index
].np
!= 0) {
68 /* if we still have some room, move it, else override */
69 if (legacy_serial_count
< MAX_LEGACY_SERIAL_PORTS
) {
70 printk(KERN_INFO
"Moved legacy port %d -> %d\n",
71 index
, legacy_serial_count
);
72 legacy_serial_ports
[legacy_serial_count
] =
73 legacy_serial_ports
[index
];
74 legacy_serial_infos
[legacy_serial_count
] =
75 legacy_serial_infos
[index
];
76 legacy_serial_count
++;
78 printk(KERN_INFO
"Replacing legacy port %d\n", index
);
82 /* Now fill the entry */
83 memset(&legacy_serial_ports
[index
], 0,
84 sizeof(struct plat_serial8250_port
));
85 if (iotype
== UPIO_PORT
)
86 legacy_serial_ports
[index
].iobase
= base
;
88 legacy_serial_ports
[index
].membase
= (void __iomem
*)base
;
89 legacy_serial_ports
[index
].iotype
= iotype
;
90 legacy_serial_ports
[index
].uartclk
= clock
;
91 legacy_serial_ports
[index
].irq
= irq
;
92 legacy_serial_ports
[index
].flags
= ASYNC_BOOT_AUTOCONF
;
93 legacy_serial_infos
[index
].taddr
= taddr
;
94 legacy_serial_infos
[index
].np
= of_node_get(np
);
95 legacy_serial_infos
[index
].clock
= clock
;
96 legacy_serial_infos
[index
].speed
= spd
? *spd
: 0;
98 printk(KERN_INFO
"Found legacy serial port %d for %s\n",
99 index
, np
->full_name
);
100 printk(KERN_INFO
" %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
101 (iotype
== UPIO_PORT
) ? "port" : "mem",
102 (unsigned long long)base
, (unsigned long long)taddr
, irq
,
103 legacy_serial_ports
[index
].uartclk
,
104 legacy_serial_infos
[index
].speed
);
109 static int __init
add_legacy_isa_port(struct device_node
*np
,
110 struct device_node
*isa_bridge
)
117 /* Get the ISA port number */
118 reg
= (u32
*)get_property(np
, "reg", NULL
);
122 /* Verify it's an IO port, we don't support anything else */
123 if (!(reg
[0] & 0x00000001))
126 /* Now look for an "ibm,aix-loc" property that gives us ordering
129 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
131 /* If we have a location index, then use it */
132 if (typep
&& *typep
== 'S')
133 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
135 /* Translate ISA address */
136 taddr
= of_translate_address(np
, reg
);
138 /* Add port, irq will be dealt with later */
139 return add_legacy_port(np
, index
, UPIO_PORT
, reg
[1], taddr
, NO_IRQ
);
143 static int __init
add_legacy_pci_port(struct device_node
*np
,
144 struct device_node
*pci_dev
)
146 phys_addr_t addr
, base
;
148 int iotype
, index
= -1;
151 /* We only support ports that have a clock frequency properly
152 * encoded in the device-tree (that is have an fcode). Anything
153 * else can't be used that early and will be normally probed by
154 * the generic 8250_pci driver later on.
156 if (get_property(np
, "clock-frequency", NULL
) == NULL
)
160 /* Get the PCI address. Assume BAR 0 */
161 addrp
= of_get_pci_address(pci_dev
, 0, NULL
);
165 /* We only support BAR 0 for now */
166 iotype
= (addrp
[0] & 0x02000000) ? UPIO_MEM
: UPIO_PORT
;
167 addr
= of_translate_address(pci_dev
, addrp
);
169 /* Set the IO base to the same as the translated address for MMIO,
170 * or to the domain local IO base for PIO (it will be fixed up later)
172 if (iotype
== UPIO_MEM
)
177 /* Try to guess an index... If we have subdevices of the pci dev,
178 * we get to their "reg" property
181 u32
*reg
= (u32
*)get_property(np
, "reg", NULL
);
182 if (reg
&& (*reg
< 4))
183 index
= legacy_serial_count
+ *reg
;
186 /* Add port, irq will be dealt with later. We passed a translated
187 * IO port value. It will be fixed up later along with the irq
189 return add_legacy_port(np
, index
, iotype
, base
, addr
, NO_IRQ
);
193 * This is called very early, as part of setup_system() or eventually
194 * setup_arch(), basically before anything else in this file. This function
195 * will try to build a list of all the available 8250-compatible serial ports
196 * in the machine using the Open Firmware device-tree. It currently only deals
197 * with ISA and PCI busses but could be extended. It allows a very early boot
198 * console to be initialized, that list is also used later to provide 8250 with
199 * the machine non-PCI ports and to properly pick the default console port
201 void __init
find_legacy_serial_ports(void)
203 struct device_node
*np
, *stdout
;
207 DBG(" -> find_legacy_serial_port()\n");
209 /* Now find out if one of these is out firmware console */
210 path
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
212 DBG(" no linux,stdout-path !\n");
215 stdout
= of_find_node_by_path(path
);
217 DBG("stdout is %s\n", stdout
->full_name
);
220 /* First fill our array with ISA ports */
221 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
222 struct device_node
*isa
= of_get_parent(np
);
223 if (isa
&& !strcmp(isa
->name
, "isa")) {
224 index
= add_legacy_isa_port(np
, isa
);
225 if (index
>= 0 && np
== stdout
)
226 legacy_serial_console
= index
;
231 /* Next, try to locate PCI ports */
232 for (np
= NULL
; (np
= of_find_all_nodes(np
));) {
233 struct device_node
*pci
, *parent
= of_get_parent(np
);
234 if (parent
&& !strcmp(parent
->name
, "isa")) {
238 if (strcmp(np
->name
, "serial") && strcmp(np
->type
, "serial")) {
242 /* Check for known pciclass, and also check wether we have
243 * a device with child nodes for ports or not
245 if (device_is_compatible(np
, "pciclass,0700") ||
246 device_is_compatible(np
, "pciclass,070002"))
248 else if (device_is_compatible(parent
, "pciclass,0700") ||
249 device_is_compatible(parent
, "pciclass,070002"))
255 index
= add_legacy_pci_port(np
, pci
);
256 if (index
>= 0 && np
== stdout
)
257 legacy_serial_console
= index
;
261 DBG("legacy_serial_console = %d\n", legacy_serial_console
);
263 /* udbg is 64 bits only for now, that will change soon though ... */
265 while (legacy_serial_console
>= 0) {
266 struct legacy_serial_info
*info
=
267 &legacy_serial_infos
[legacy_serial_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
);
281 #endif /* CONFIG_PPC64 */
283 DBG(" <- find_legacy_serial_port()\n");
286 static struct platform_device serial_device
= {
287 .name
= "serial8250",
288 .id
= PLAT8250_DEV_PLATFORM
,
290 .platform_data
= legacy_serial_ports
,
294 static void __init
fixup_port_irq(int index
,
295 struct device_node
*np
,
296 struct plat_serial8250_port
*port
)
298 DBG("fixup_port_irq(%d)\n", index
);
300 /* Check for interrupts in that node */
301 if (np
->n_intrs
> 0) {
302 port
->irq
= np
->intrs
[0].line
;
303 DBG(" port %d (%s), irq=%d\n",
304 index
, np
->full_name
, port
->irq
);
308 /* Check for interrupts in the parent */
309 np
= of_get_parent(np
);
313 if (np
->n_intrs
> 0) {
314 port
->irq
= np
->intrs
[0].line
;
315 DBG(" port %d (%s), irq=%d\n",
316 index
, np
->full_name
, port
->irq
);
321 static void __init
fixup_port_pio(int index
,
322 struct device_node
*np
,
323 struct plat_serial8250_port
*port
)
325 struct pci_controller
*hose
;
327 DBG("fixup_port_pio(%d)\n", index
);
329 hose
= pci_find_hose_for_OF_device(np
);
331 unsigned long offset
= (unsigned long)hose
->io_base_virt
-
337 DBG("port %d, IO %lx -> %lx\n",
338 index
, port
->iobase
, port
->iobase
+ offset
);
339 port
->iobase
+= offset
;
344 * This is called as an arch initcall, hopefully before the PCI bus is
345 * probed and/or the 8250 driver loaded since we need to register our
346 * platform devices before 8250 PCI ones are detected as some of them
347 * must properly "override" the platform ones.
349 * This function fixes up the interrupt value for platform ports as it
350 * couldn't be done earlier before interrupt maps have been parsed. It
351 * also "corrects" the IO address for PIO ports for the same reason,
352 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
353 * registers all those platform ports for use by the 8250 driver when it
356 static int __init
serial_dev_init(void)
360 if (legacy_serial_count
== 0)
364 * Before we register the platfrom serial devices, we need
365 * to fixup their interrutps and their IO ports.
367 DBG("Fixing serial ports interrupts and IO ports ...\n");
369 for (i
= 0; i
< legacy_serial_count
; i
++) {
370 struct plat_serial8250_port
*port
= &legacy_serial_ports
[i
];
371 struct device_node
*np
= legacy_serial_infos
[i
].np
;
373 if (port
->irq
== NO_IRQ
)
374 fixup_port_irq(i
, np
, port
);
375 if (port
->iotype
== UPIO_PORT
)
376 fixup_port_pio(i
, np
, port
);
379 DBG("Registering platform serial ports\n");
381 return platform_device_register(&serial_device
);
383 arch_initcall(serial_dev_init
);
387 * This is called very early, as part of console_init() (typically just after
388 * time_init()). This function is respondible for trying to find a good
389 * default console on serial ports. It tries to match the open firmware
390 * default output with one of the available serial console drivers, either
391 * one of the platform serial ports that have been probed earlier by
392 * find_legacy_serial_ports() or some more platform specific ones.
394 static int __init
check_legacy_serial_console(void)
396 struct device_node
*prom_stdout
= NULL
;
397 int speed
= 0, offset
= 0;
401 DBG(" -> check_legacy_serial_console()\n");
403 /* The user has requested a console so this is already set up. */
404 if (strstr(saved_command_line
, "console=")) {
405 DBG(" console was specified !\n");
410 DBG(" of_chosen is NULL !\n");
413 /* We are getting a weird phandle from OF ... */
414 /* ... So use the full path instead */
415 name
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
417 DBG(" no linux,stdout-path !\n");
420 prom_stdout
= of_find_node_by_path(name
);
422 DBG(" can't find stdout package %s !\n", name
);
425 DBG("stdout is %s\n", prom_stdout
->full_name
);
427 name
= (char *)get_property(prom_stdout
, "name", NULL
);
429 DBG(" stdout package has no name !\n");
432 spd
= (u32
*)get_property(prom_stdout
, "current-speed", NULL
);
438 #ifdef CONFIG_SERIAL_8250_CONSOLE
439 else if (strcmp(name
, "serial") == 0) {
441 /* Look for it in probed array */
442 for (i
= 0; i
< legacy_serial_count
; i
++) {
443 if (prom_stdout
!= legacy_serial_infos
[i
].np
)
446 speed
= legacy_serial_infos
[i
].speed
;
449 if (i
>= legacy_serial_count
)
452 #endif /* CONFIG_SERIAL_8250_CONSOLE */
453 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
454 else if (strcmp(name
, "ch-a") == 0)
456 else if (strcmp(name
, "ch-b") == 0)
458 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
461 of_node_put(prom_stdout
);
463 DBG("Found serial console at ttyS%d\n", offset
);
466 static char __initdata opt
[16];
467 sprintf(opt
, "%d", speed
);
468 return add_preferred_console("ttyS", offset
, opt
);
470 return add_preferred_console("ttyS", offset
, NULL
);
473 DBG("No preferred console found !\n");
474 of_node_put(prom_stdout
);
477 console_initcall(check_legacy_serial_console
);