xref: /openbmc/linux/drivers/tty/serial/8250/Kconfig (revision c819e2cf)
1#
2# The 8250/16550 serial drivers.  You shouldn't be in this list unless
3# you somehow have an implicit or explicit dependency on SERIAL_8250.
4#
5
6config SERIAL_8250
7	tristate "8250/16550 and compatible serial support"
8	select SERIAL_CORE
9	---help---
10	  This selects whether you want to include the driver for the standard
11	  serial ports.  The standard answer is Y.  People who might say N
12	  here are those that are setting up dedicated Ethernet WWW/FTP
13	  servers, or users that have one of the various bus mice instead of a
14	  serial mouse and don't intend to use their machine's standard serial
15	  port for anything.  (Note that the Cyclades multi serial port driver
16	  does not need this driver built in for it to work.)
17
18	  To compile this driver as a module, choose M here: the
19	  module will be called 8250.
20	  [WARNING: Do not compile this driver as a module if you are using
21	  non-standard serial ports, since the configuration information will
22	  be lost when the driver is unloaded.  This limitation may be lifted
23	  in the future.]
24
25	  BTW1: If you have a mouseman serial mouse which is not recognized by
26	  the X window system, try running gpm first.
27
28	  BTW2: If you intend to use a software modem (also called Winmodem)
29	  under Linux, forget it.  These modems are crippled and require
30	  proprietary drivers which are only available under Windows.
31
32	  Most people will say Y or M here, so that they can use serial mice,
33	  modems and similar devices connecting to the standard serial ports.
34
35config SERIAL_8250_DEPRECATED_OPTIONS
36	bool "Support 8250_core.* kernel options (DEPRECATED)"
37	depends on SERIAL_8250
38	default y
39	---help---
40	  In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
41	  accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
42	  8250.nr_uarts=4. We now renamed the module back to 8250, but if
43	  anybody noticed in 3.7 and changed their userspace we still have to
44	  keep the 8250_core.* options around until they revert the changes
45	  they already did.
46
47	  If 8250 is built as a module, this adds 8250_core alias instead.
48
49	  If you did not notice yet and/or you have userspace from pre-3.7, it
50	  is safe (and recommended) to say N here.
51
52config SERIAL_8250_PNP
53	bool "8250/16550 PNP device support" if EXPERT
54	depends on SERIAL_8250 && PNP
55	default y
56	---help---
57	  This builds standard PNP serial support. You may be able to
58	  disable this feature if you only need legacy serial support.
59
60config SERIAL_8250_CONSOLE
61	bool "Console on 8250/16550 and compatible serial port"
62	depends on SERIAL_8250=y
63	select SERIAL_CORE_CONSOLE
64	select SERIAL_EARLYCON
65	---help---
66	  If you say Y here, it will be possible to use a serial port as the
67	  system console (the system console is the device which receives all
68	  kernel messages and warnings and which allows logins in single user
69	  mode). This could be useful if some terminal or printer is connected
70	  to that serial port.
71
72	  Even if you say Y here, the currently visible virtual console
73	  (/dev/tty0) will still be used as the system console by default, but
74	  you can alter that using a kernel command line option such as
75	  "console=ttyS1". (Try "man bootparam" or see the documentation of
76	  your boot loader (grub or lilo or loadlin) about how to pass options
77	  to the kernel at boot time.)
78
79	  If you don't have a VGA card installed and you say Y here, the
80	  kernel will automatically use the first serial line, /dev/ttyS0, as
81	  system console.
82
83	  You can set that using a kernel command line option such as
84	  "console=uart8250,io,0x3f8,9600n8"
85	  "console=uart8250,mmio,0xff5e0000,115200n8".
86	  and it will switch to normal serial console when the corresponding
87	  port is ready.
88	  "earlycon=uart8250,io,0x3f8,9600n8"
89	  "earlycon=uart8250,mmio,0xff5e0000,115200n8".
90	  it will not only setup early console.
91
92	  If unsure, say N.
93
94config SERIAL_8250_GSC
95	tristate
96	depends on SERIAL_8250 && GSC
97	default SERIAL_8250
98
99config SERIAL_8250_DMA
100	bool "DMA support for 16550 compatible UART controllers" if EXPERT
101	depends on SERIAL_8250 && DMADEVICES=y
102	default SERIAL_8250
103	help
104	  This builds DMA support that can be used with 8250/16650
105	  compatible UART controllers that support DMA signaling.
106
107config SERIAL_8250_PCI
108	tristate "8250/16550 PCI device support" if EXPERT
109	depends on SERIAL_8250 && PCI
110	default SERIAL_8250
111	help
112	  This builds standard PCI serial support. You may be able to
113	  disable this feature if you only need legacy serial support.
114	  Saves about 9K.
115	  Note that serial ports on NetMos 9835 Multi-I/O cards are handled
116	  by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
117
118config SERIAL_8250_HP300
119	tristate
120	depends on SERIAL_8250 && HP300
121	default SERIAL_8250
122
123config SERIAL_8250_CS
124	tristate "8250/16550 PCMCIA device support"
125	depends on PCMCIA && SERIAL_8250
126	---help---
127	  Say Y here to enable support for 16-bit PCMCIA serial devices,
128	  including serial port cards, modems, and the modem functions of
129	  multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
130	  credit-card size devices often used with laptops.)
131
132	  To compile this driver as a module, choose M here: the
133	  module will be called serial_cs.
134
135	  If unsure, say N.
136
137config SERIAL_8250_NR_UARTS
138	int "Maximum number of 8250/16550 serial ports"
139	depends on SERIAL_8250
140	default "4"
141	help
142	  Set this to the number of serial ports you want the driver
143	  to support.  This includes any ports discovered via ACPI or
144	  PCI enumeration and any ports that may be added at run-time
145	  via hot-plug, or any ISA multi-port serial cards.
146
147config SERIAL_8250_RUNTIME_UARTS
148	int "Number of 8250/16550 serial ports to register at runtime"
149	depends on SERIAL_8250
150	range 0 SERIAL_8250_NR_UARTS
151	default "4"
152	help
153	  Set this to the maximum number of serial ports you want
154	  the kernel to register at boot time.  This can be overridden
155	  with the module parameter "nr_uarts", or boot-time parameter
156	  8250.nr_uarts
157
158config SERIAL_8250_EXTENDED
159	bool "Extended 8250/16550 serial driver options"
160	depends on SERIAL_8250
161	help
162	  If you wish to use any non-standard features of the standard "dumb"
163	  driver, say Y here. This includes HUB6 support, shared serial
164	  interrupts, special multiport support, support for more than the
165	  four COM 1/2/3/4 boards, etc.
166
167	  Note that the answer to this question won't directly affect the
168	  kernel: saying N will just cause the configurator to skip all
169	  the questions about serial driver options. If unsure, say N.
170
171config SERIAL_8250_MANY_PORTS
172	bool "Support more than 4 legacy serial ports"
173	depends on SERIAL_8250_EXTENDED && !IA64
174	help
175	  Say Y here if you have dumb serial boards other than the four
176	  standard COM 1/2/3/4 ports. This may happen if you have an AST
177	  FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
178	  from <http://www.tldp.org/docs.html#howto>), or other custom
179	  serial port hardware which acts similar to standard serial port
180	  hardware. If you only use the standard COM 1/2/3/4 ports, you can
181	  say N here to save some memory. You can also say Y if you have an
182	  "intelligent" multiport card such as Cyclades, Digiboards, etc.
183
184#
185# Multi-port serial cards
186#
187
188config SERIAL_8250_FOURPORT
189	tristate "Support Fourport cards"
190	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
191	help
192	  Say Y here if you have an AST FourPort serial board.
193
194	  To compile this driver as a module, choose M here: the module
195	  will be called 8250_fourport.
196
197config SERIAL_8250_ACCENT
198	tristate "Support Accent cards"
199	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
200	help
201	  Say Y here if you have an Accent Async serial board.
202
203	  To compile this driver as a module, choose M here: the module
204	  will be called 8250_accent.
205
206config SERIAL_8250_BOCA
207	tristate "Support Boca cards"
208	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
209	help
210	  Say Y here if you have a Boca serial board.  Please read the Boca
211	  mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
212
213	  To compile this driver as a module, choose M here: the module
214	  will be called 8250_boca.
215
216config SERIAL_8250_EXAR_ST16C554
217	tristate "Support Exar ST16C554/554D Quad UART"
218	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
219	help
220	  The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
221	  tinkering with your Envoy TU301, or have a machine with this UART,
222	  say Y here.
223
224	  To compile this driver as a module, choose M here: the module
225	  will be called 8250_exar_st16c554.
226
227config SERIAL_8250_HUB6
228	tristate "Support Hub6 cards"
229	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
230	help
231	  Say Y here if you have a HUB6 serial board.
232
233	  To compile this driver as a module, choose M here: the module
234	  will be called 8250_hub6.
235
236#
237# Misc. options/drivers.
238#
239
240config SERIAL_8250_SHARE_IRQ
241	bool "Support for sharing serial interrupts"
242	depends on SERIAL_8250_EXTENDED
243	help
244	  Some serial boards have hardware support which allows multiple dumb
245	  serial ports on the same board to share a single IRQ. To enable
246	  support for this in the serial driver, say Y here.
247
248config SERIAL_8250_DETECT_IRQ
249	bool "Autodetect IRQ on standard ports (unsafe)"
250	depends on SERIAL_8250_EXTENDED
251	help
252	  Say Y here if you want the kernel to try to guess which IRQ
253	  to use for your serial port.
254
255	  This is considered unsafe; it is far better to configure the IRQ in
256	  a boot script using the setserial command.
257
258	  If unsure, say N.
259
260config SERIAL_8250_RSA
261	bool "Support RSA serial ports"
262	depends on SERIAL_8250_EXTENDED
263	help
264	  ::: To be written :::
265
266config SERIAL_8250_ACORN
267	tristate "Acorn expansion card serial port support"
268	depends on ARCH_ACORN && SERIAL_8250
269	help
270	  If you have an Atomwide Serial card or Serial Port card for an Acorn
271	  system, say Y to this option.  The driver can handle 1, 2, or 3 port
272	  cards.  If unsure, say N.
273
274config SERIAL_8250_FSL
275	bool
276	depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
277	default PPC
278
279config SERIAL_8250_DW
280	tristate "Support for Synopsys DesignWare 8250 quirks"
281	depends on SERIAL_8250
282	help
283	  Selecting this option will enable handling of the extra features
284	  present in the Synopsys DesignWare APB UART.
285
286config SERIAL_8250_EM
287	tristate "Support for Emma Mobile integrated serial port"
288	depends on SERIAL_8250 && ARM && HAVE_CLK
289	help
290	  Selecting this option will add support for the integrated serial
291	  port hardware found on the Emma Mobile line of processors.
292	  If unsure, say N.
293
294config SERIAL_8250_RT288X
295	bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
296	depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620)
297	help
298	  If you have a Ralink RT288x/RT305x SoC based board and want to use the
299	  serial port, say Y to this option. The driver can handle up to 2 serial
300	  ports. If unsure, say N.
301
302config SERIAL_8250_OMAP
303	tristate "Support for OMAP internal UART (8250 based driver)"
304	depends on SERIAL_8250 && ARCH_OMAP2PLUS
305	help
306	  If you have a machine based on an Texas Instruments OMAP CPU you
307	  can enable its onboard serial ports by enabling this option.
308
309	  This driver uses ttyS instead of ttyO.
310
311config SERIAL_8250_FINTEK
312	tristate "Support for Fintek F81216A LPC to 4 UART"
313	depends on SERIAL_8250 && PNP
314	help
315	  Selecting this option will add support for the Fintek F81216A
316	  LPC to 4 UART. This device has some RS485 functionality not available
317	  through the PNP driver. If unsure, say N.
318
319config SERIAL_8250_MT6577
320	bool "Mediatek serial port support"
321	depends on SERIAL_8250 && ARCH_MEDIATEK
322	help
323	  If you have a Mediatek based board and want to use the
324	  serial port, say Y to this option. If unsure, say N.
325