blob: 4d7cb9c04fce73b93db59fdaed5832310aaaff44 [file] [log] [blame]
Paul Gortmaker9bef3d42012-01-05 18:21:43 -05001#
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
Paul Bollee943f582013-05-28 09:29:36 +020015 port for anything. (Note that the Cyclades multi serial port driver
16 does not need this driver built in for it to work.)
Paul Gortmaker9bef3d42012-01-05 18:21:43 -050017
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
Jiri Slaby9326b042013-03-19 11:34:57 +010035config 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
Randy Dunlapf3014122013-11-07 09:58:14 -080044 keep the 8250_core.* options around until they revert the changes
Jiri Slaby9326b042013-03-19 11:34:57 +010045 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
Sean Young835d8442012-09-07 19:06:23 +010052config 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
Paul Gortmaker9bef3d42012-01-05 18:21:43 -050060config SERIAL_8250_CONSOLE
61 bool "Console on 8250/16550 and compatible serial port"
62 depends on SERIAL_8250=y
63 select SERIAL_CORE_CONSOLE
Rob Herringd2fd6812014-04-18 17:19:56 -050064 select SERIAL_EARLYCON
Paul Gortmaker9bef3d42012-01-05 18:21:43 -050065 ---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
Paul Gortmaker9bef3d42012-01-05 18:21:43 -050094config SERIAL_8250_GSC
95 tristate
96 depends on SERIAL_8250 && GSC
97 default SERIAL_8250
98
Heikki Krogerus9ee4b832013-01-10 11:25:11 +020099config 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
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500107config SERIAL_8250_PCI
108 tristate "8250/16550 PCI device support" if EXPERT
109 depends on SERIAL_8250 && PCI
110 default SERIAL_8250
Andy Shevchenko21947ba2015-03-13 18:51:12 +0200111 select RATIONAL
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500112 help
113 This builds standard PCI serial support. You may be able to
114 disable this feature if you only need legacy serial support.
115 Saves about 9K.
Stefan Seyfried972ce082013-07-01 09:14:21 +0200116 Note that serial ports on NetMos 9835 Multi-I/O cards are handled
117 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500118
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500119config SERIAL_8250_HP300
120 tristate
121 depends on SERIAL_8250 && HP300
122 default SERIAL_8250
123
124config SERIAL_8250_CS
125 tristate "8250/16550 PCMCIA device support"
126 depends on PCMCIA && SERIAL_8250
127 ---help---
128 Say Y here to enable support for 16-bit PCMCIA serial devices,
129 including serial port cards, modems, and the modem functions of
130 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
131 credit-card size devices often used with laptops.)
132
133 To compile this driver as a module, choose M here: the
134 module will be called serial_cs.
135
136 If unsure, say N.
137
138config SERIAL_8250_NR_UARTS
139 int "Maximum number of 8250/16550 serial ports"
140 depends on SERIAL_8250
141 default "4"
142 help
143 Set this to the number of serial ports you want the driver
144 to support. This includes any ports discovered via ACPI or
145 PCI enumeration and any ports that may be added at run-time
146 via hot-plug, or any ISA multi-port serial cards.
147
148config SERIAL_8250_RUNTIME_UARTS
149 int "Number of 8250/16550 serial ports to register at runtime"
150 depends on SERIAL_8250
151 range 0 SERIAL_8250_NR_UARTS
152 default "4"
153 help
154 Set this to the maximum number of serial ports you want
155 the kernel to register at boot time. This can be overridden
156 with the module parameter "nr_uarts", or boot-time parameter
157 8250.nr_uarts
158
159config SERIAL_8250_EXTENDED
160 bool "Extended 8250/16550 serial driver options"
161 depends on SERIAL_8250
162 help
163 If you wish to use any non-standard features of the standard "dumb"
164 driver, say Y here. This includes HUB6 support, shared serial
165 interrupts, special multiport support, support for more than the
166 four COM 1/2/3/4 boards, etc.
167
168 Note that the answer to this question won't directly affect the
169 kernel: saying N will just cause the configurator to skip all
170 the questions about serial driver options. If unsure, say N.
171
172config SERIAL_8250_MANY_PORTS
173 bool "Support more than 4 legacy serial ports"
174 depends on SERIAL_8250_EXTENDED && !IA64
175 help
176 Say Y here if you have dumb serial boards other than the four
177 standard COM 1/2/3/4 ports. This may happen if you have an AST
178 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
179 from <http://www.tldp.org/docs.html#howto>), or other custom
180 serial port hardware which acts similar to standard serial port
181 hardware. If you only use the standard COM 1/2/3/4 ports, you can
182 say N here to save some memory. You can also say Y if you have an
183 "intelligent" multiport card such as Cyclades, Digiboards, etc.
184
185#
186# Multi-port serial cards
187#
188
189config SERIAL_8250_FOURPORT
190 tristate "Support Fourport cards"
191 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
192 help
193 Say Y here if you have an AST FourPort serial board.
194
195 To compile this driver as a module, choose M here: the module
196 will be called 8250_fourport.
197
198config SERIAL_8250_ACCENT
199 tristate "Support Accent cards"
200 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
201 help
202 Say Y here if you have an Accent Async serial board.
203
204 To compile this driver as a module, choose M here: the module
205 will be called 8250_accent.
206
207config SERIAL_8250_BOCA
208 tristate "Support Boca cards"
209 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
210 help
211 Say Y here if you have a Boca serial board. Please read the Boca
212 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
213
214 To compile this driver as a module, choose M here: the module
215 will be called 8250_boca.
216
217config SERIAL_8250_EXAR_ST16C554
218 tristate "Support Exar ST16C554/554D Quad UART"
219 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
220 help
221 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
222 tinkering with your Envoy TU301, or have a machine with this UART,
223 say Y here.
224
225 To compile this driver as a module, choose M here: the module
226 will be called 8250_exar_st16c554.
227
228config SERIAL_8250_HUB6
229 tristate "Support Hub6 cards"
230 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
231 help
232 Say Y here if you have a HUB6 serial board.
233
234 To compile this driver as a module, choose M here: the module
235 will be called 8250_hub6.
236
237#
238# Misc. options/drivers.
239#
240
241config SERIAL_8250_SHARE_IRQ
242 bool "Support for sharing serial interrupts"
243 depends on SERIAL_8250_EXTENDED
244 help
245 Some serial boards have hardware support which allows multiple dumb
246 serial ports on the same board to share a single IRQ. To enable
247 support for this in the serial driver, say Y here.
248
249config SERIAL_8250_DETECT_IRQ
250 bool "Autodetect IRQ on standard ports (unsafe)"
251 depends on SERIAL_8250_EXTENDED
252 help
253 Say Y here if you want the kernel to try to guess which IRQ
254 to use for your serial port.
255
256 This is considered unsafe; it is far better to configure the IRQ in
257 a boot script using the setserial command.
258
259 If unsure, say N.
260
261config SERIAL_8250_RSA
262 bool "Support RSA serial ports"
263 depends on SERIAL_8250_EXTENDED
264 help
Maciej S. Szmigieroa95fc9c2016-03-05 18:35:30 +0100265 Say Y here if you have a IODATA RSA-DV II/S ISA card and
266 would like to use its >115kbps speeds.
267 You will need to provide module parameter "probe_rsa", or boot-time
268 parameter 8250.probe_rsa with I/O addresses of this card then.
269
270 If you don't have such card, or if unsure, say N.
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500271
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500272config SERIAL_8250_ACORN
273 tristate "Acorn expansion card serial port support"
274 depends on ARCH_ACORN && SERIAL_8250
275 help
276 If you have an Atomwide Serial card or Serial Port card for an Acorn
277 system, say Y to this option. The driver can handle 1, 2, or 3 port
278 cards. If unsure, say N.
279
Martin Sperlbdc5f302016-01-17 12:15:30 +0000280config SERIAL_8250_BCM2835AUX
281 tristate "BCM2835 auxiliar mini UART support"
282 depends on ARCH_BCM2835 || COMPILE_TEST
283 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
284 help
285 Support for the BCM2835 auxiliar mini UART.
286
287 Features and limitations of the UART are
288 Registers are similar to 16650 registers,
289 set bits in the control registers that are unsupported
290 are ignored and read back as 0
291 7/8 bit operation with 1 start and 1 stop bit
292 8 symbols deep fifo for rx and tx
293 SW controlled RTS and SW readable CTS
294 Clock rate derived from system clock
295 Uses 8 times oversampling (compared to 16 times for 16650)
296 Missing break detection (but break generation)
297 Missing framing error detection
298 Missing parity bit
299 Missing receive time-out interrupt
300 Missing DCD, DSR, DTR and RI signals
301
302 If unsure, say N.
303
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500304config SERIAL_8250_FSL
305 bool
Scott Woodd43b54d2015-10-07 17:31:21 -0500306 depends on SERIAL_8250_CONSOLE
307 default PPC || ARM || ARM64
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500308
309config SERIAL_8250_DW
310 tristate "Support for Synopsys DesignWare 8250 quirks"
Heikki Krogerus6a7320c2013-01-10 11:25:10 +0200311 depends on SERIAL_8250
Paul Gortmaker9bef3d42012-01-05 18:21:43 -0500312 help
313 Selecting this option will enable handling of the extra features
314 present in the Synopsys DesignWare APB UART.
Magnus Damm22886ee2012-05-03 21:13:09 +0900315
316config SERIAL_8250_EM
Masanari Iida46e99c42012-10-24 23:29:41 +0900317 tristate "Support for Emma Mobile integrated serial port"
Magnus Damm22886ee2012-05-03 21:13:09 +0900318 depends on SERIAL_8250 && ARM && HAVE_CLK
319 help
320 Selecting this option will add support for the integrated serial
321 port hardware found on the Emma Mobile line of processors.
322 If unsure, say N.
John Crispinc4208112013-01-25 19:39:51 +0100323
324config SERIAL_8250_RT288X
325 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
Mans Rullgard9b2256c2015-09-15 17:54:13 +0100326 depends on SERIAL_8250
327 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
John Crispinc4208112013-01-25 19:39:51 +0100328 help
Mans Rullgard9b2256c2015-09-15 17:54:13 +0100329 Selecting this option will add support for the alternate register
330 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
331 If unsure, say N.
Ricardo Ribalda Delgado28e3fb62014-07-31 21:22:26 +0200332
Sebastian Andrzej Siewior61929cf2014-09-29 20:06:39 +0200333config SERIAL_8250_OMAP
334 tristate "Support for OMAP internal UART (8250 based driver)"
335 depends on SERIAL_8250 && ARCH_OMAP2PLUS
336 help
337 If you have a machine based on an Texas Instruments OMAP CPU you
338 can enable its onboard serial ports by enabling this option.
339
340 This driver uses ttyS instead of ttyO.
341
Sebastian Andrzej Siewior00648d02014-12-18 18:47:12 +0100342config SERIAL_8250_OMAP_TTYO_FIXUP
343 bool "Replace ttyO with ttyS"
344 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
345 default y
346 help
347 This option replaces the "console=ttyO" argument with the matching
348 ttyS argument if the user did not specified it on the command line.
349 This ensures that the user can see the kernel output during boot
350 which he wouldn't see otherwise. The getty has still to be configured
351 for ttyS instead of ttyO regardless of this option.
352 This option is intended for people who "automatically" enable this
353 driver without knowing that this driver requires a different console=
354 argument. If you read this, please keep this option disabled and
355 instead update your kernel command line. If you prepare a kernel for a
356 distribution or other kind of larger user base then you probably want
357 to keep this option enabled. Otherwise people might complain about a
358 not booting kernel because the serial console remains silent in case
359 they forgot to update the command line.
360
Ricardo Ribalda Delgado28e3fb62014-07-31 21:22:26 +0200361config SERIAL_8250_FINTEK
362 tristate "Support for Fintek F81216A LPC to 4 UART"
363 depends on SERIAL_8250 && PNP
364 help
365 Selecting this option will add support for the Fintek F81216A
366 LPC to 4 UART. This device has some RS485 functionality not available
367 through the PNP driver. If unsure, say N.
368
Joachim Eastwoodd2aef352015-05-30 23:14:44 +0200369config SERIAL_8250_LPC18XX
Paul Gortmaker0b1dd992015-08-19 17:48:09 -0400370 tristate "NXP LPC18xx/43xx serial port support"
Joachim Eastwoodd2aef352015-05-30 23:14:44 +0200371 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
372 default ARCH_LPC18XX
373 help
374 If you have a LPC18xx/43xx based board and want to use the
375 serial port, say Y to this option. If unsure, say Y.
376
Matthias Bruggerb4756f42014-09-09 17:31:42 +0200377config SERIAL_8250_MT6577
Arnd Bergmann3f5921a2016-02-17 16:02:35 +0100378 tristate "Mediatek serial port support"
Matthias Bruggerb4756f42014-09-09 17:31:42 +0200379 depends on SERIAL_8250 && ARCH_MEDIATEK
380 help
381 If you have a Mediatek based board and want to use the
382 serial port, say Y to this option. If unsure, say N.
Masahiro Yamada1a8d2902015-05-29 15:04:31 +0900383
384config SERIAL_8250_UNIPHIER
385 tristate "Support for UniPhier on-chip UART"
386 depends on SERIAL_8250 && ARCH_UNIPHIER
387 help
388 If you have a UniPhier based board and want to use the on-chip
389 serial ports, say Y to this option. If unsure, say N.
Linus Torvalds78c10e52015-06-27 12:44:34 -0700390
Paul Burton0cf985f2015-05-24 16:11:44 +0100391config SERIAL_8250_INGENIC
Arnd Bergmann7d774fb2016-02-17 16:02:34 +0100392 tristate "Support for Ingenic SoC serial ports"
393 depends on SERIAL_8250
394 depends on (OF_FLATTREE && SERIAL_8250_CONSOLE) || !SERIAL_EARLYCON
395 depends on MIPS || COMPILE_TEST
Paul Burton0cf985f2015-05-24 16:11:44 +0100396 help
397 If you have a system using an Ingenic SoC and wish to make use of
398 its UARTs, say Y to this option. If unsure, say N.
Heikki Krogerusd9eda9b2015-10-13 13:29:02 +0300399
400config SERIAL_8250_MID
401 tristate "Support for serial ports on Intel MID platforms"
402 depends on SERIAL_8250 && PCI
Heikki Krogerusec2f1b62015-10-13 13:29:03 +0300403 select HSU_DMA if SERIAL_8250_DMA
Heikki Krogerus0ff42302015-12-10 13:26:21 +0200404 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
Heikki Krogerusfa700452015-11-12 15:21:23 +0200405 select RATIONAL
Heikki Krogerusd9eda9b2015-10-13 13:29:02 +0300406 help
407 Selecting this option will enable handling of the extra features
408 present on the UART found on Intel Medfield SOC and various other
409 Intel platforms.
Arnd Bergmannafd7f882015-11-16 16:48:14 +0100410
Mathieu OTHACEHEc216c4a2016-02-24 20:10:22 +0100411config SERIAL_8250_MOXA
412 tristate "MOXA SmartIO MUE support"
413 depends on SERIAL_8250 && PCI
414 help
415 Say Y here if you have a Moxa SmartIO MUE multiport serial card.
416 If unsure, say N.
417
418 This driver can also be built as a module. The module will be called
419 8250_moxa. If you want to do that, say M here.
420
Arnd Bergmannafd7f882015-11-16 16:48:14 +0100421config SERIAL_OF_PLATFORM
422 tristate "Devicetree based probing for 8250 ports"
423 depends on SERIAL_8250 && OF
424 help
425 This option is used for all 8250 compatible serial ports that
426 are probed through devicetree, including Open Firmware based
427 PowerPC systems and embedded systems on architectures using the
428 flattened device tree format.