[linux-block.git] / drivers / tty / serial / 8250 / Kconfig

#
# The 8250/16550 serial drivers.  You shouldn't be in this list unless
# you somehow have an implicit or explicit dependency on SERIAL_8250.
#

config SERIAL_8250
	tristate "8250/16550 and compatible serial support"
	select SERIAL_CORE
	---help---
	  This selects whether you want to include the driver for the standard
	  serial ports.  The standard answer is Y.  People who might say N
	  here are those that are setting up dedicated Ethernet WWW/FTP
	  servers, or users that have one of the various bus mice instead of a
	  serial mouse and don't intend to use their machine's standard serial
	  port for anything.  (Note that the Cyclades multi serial port driver
	  does not need this driver built in for it to work.)

	  To compile this driver as a module, choose M here: the
	  module will be called 8250.
	  [WARNING: Do not compile this driver as a module if you are using
	  non-standard serial ports, since the configuration information will
	  be lost when the driver is unloaded.  This limitation may be lifted
	  in the future.]

	  BTW1: If you have a mouseman serial mouse which is not recognized by
	  the X window system, try running gpm first.

	  BTW2: If you intend to use a software modem (also called Winmodem)
	  under Linux, forget it.  These modems are crippled and require
	  proprietary drivers which are only available under Windows.

	  Most people will say Y or M here, so that they can use serial mice,
	  modems and similar devices connecting to the standard serial ports.

config SERIAL_8250_DEPRECATED_OPTIONS
	bool "Support 8250_core.* kernel options (DEPRECATED)"
	depends on SERIAL_8250
	default y
	---help---
	  In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
	  accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
	  8250.nr_uarts=4. We now renamed the module back to 8250, but if
	  anybody noticed in 3.7 and changed their userspace we still have to
	  keep the 8250_core.* options around until they revert the changes
	  they already did.

	  If 8250 is built as a module, this adds 8250_core alias instead. 

	  If you did not notice yet and/or you have userspace from pre-3.7, it
	  is safe (and recommended) to say N here.

config SERIAL_8250_PNP
	bool "8250/16550 PNP device support" if EXPERT
	depends on SERIAL_8250 && PNP
	default y
	---help---
	  This builds standard PNP serial support. You may be able to
	  disable this feature if you only need legacy serial support.

config SERIAL_8250_CONSOLE
	bool "Console on 8250/16550 and compatible serial port"
	depends on SERIAL_8250=y
	select SERIAL_CORE_CONSOLE
	---help---
	  If you say Y here, it will be possible to use a serial port as the
	  system console (the system console is the device which receives all
	  kernel messages and warnings and which allows logins in single user
	  mode). This could be useful if some terminal or printer is connected
	  to that serial port.

	  Even if you say Y here, the currently visible virtual console
	  (/dev/tty0) will still be used as the system console by default, but
	  you can alter that using a kernel command line option such as
	  "console=ttyS1". (Try "man bootparam" or see the documentation of
	  your boot loader (grub or lilo or loadlin) about how to pass options
	  to the kernel at boot time.)

	  If you don't have a VGA card installed and you say Y here, the
	  kernel will automatically use the first serial line, /dev/ttyS0, as
	  system console.

	  You can set that using a kernel command line option such as
	  "console=uart8250,io,0x3f8,9600n8"
	  "console=uart8250,mmio,0xff5e0000,115200n8".
	  and it will switch to normal serial console when the corresponding
	  port is ready.
	  "earlycon=uart8250,io,0x3f8,9600n8"
	  "earlycon=uart8250,mmio,0xff5e0000,115200n8".
	  it will not only setup early console.

	  If unsure, say N.

config FIX_EARLYCON_MEM
	bool
	depends on X86
	default y

config SERIAL_8250_GSC
	tristate
	depends on SERIAL_8250 && GSC
	default SERIAL_8250

config SERIAL_8250_DMA
	bool "DMA support for 16550 compatible UART controllers" if EXPERT
	depends on SERIAL_8250 && DMADEVICES=y
	default SERIAL_8250
	help
	  This builds DMA support that can be used with 8250/16650
	  compatible UART controllers that support DMA signaling.

config SERIAL_8250_PCI
	tristate "8250/16550 PCI device support" if EXPERT
	depends on SERIAL_8250 && PCI
	default SERIAL_8250
	help
	  This builds standard PCI serial support. You may be able to
	  disable this feature if you only need legacy serial support.
	  Saves about 9K.
	  Note that serial ports on NetMos 9835 Multi-I/O cards are handled
	  by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.

config SERIAL_8250_HP300
	tristate
	depends on SERIAL_8250 && HP300
	default SERIAL_8250

config SERIAL_8250_CS
	tristate "8250/16550 PCMCIA device support"
	depends on PCMCIA && SERIAL_8250
	---help---
	  Say Y here to enable support for 16-bit PCMCIA serial devices,
	  including serial port cards, modems, and the modem functions of
	  multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
	  credit-card size devices often used with laptops.)

	  To compile this driver as a module, choose M here: the
	  module will be called serial_cs.

	  If unsure, say N.

config SERIAL_8250_NR_UARTS
	int "Maximum number of 8250/16550 serial ports"
	depends on SERIAL_8250
	default "4"
	help
	  Set this to the number of serial ports you want the driver
	  to support.  This includes any ports discovered via ACPI or
	  PCI enumeration and any ports that may be added at run-time
	  via hot-plug, or any ISA multi-port serial cards.

config SERIAL_8250_RUNTIME_UARTS
	int "Number of 8250/16550 serial ports to register at runtime"
	depends on SERIAL_8250
	range 0 SERIAL_8250_NR_UARTS
	default "4"
	help
	  Set this to the maximum number of serial ports you want
	  the kernel to register at boot time.  This can be overridden
	  with the module parameter "nr_uarts", or boot-time parameter
	  8250.nr_uarts

config SERIAL_8250_EXTENDED
	bool "Extended 8250/16550 serial driver options"
	depends on SERIAL_8250
	help
	  If you wish to use any non-standard features of the standard "dumb"
	  driver, say Y here. This includes HUB6 support, shared serial
	  interrupts, special multiport support, support for more than the
	  four COM 1/2/3/4 boards, etc.

	  Note that the answer to this question won't directly affect the
	  kernel: saying N will just cause the configurator to skip all
	  the questions about serial driver options. If unsure, say N.

config SERIAL_8250_MANY_PORTS
	bool "Support more than 4 legacy serial ports"
	depends on SERIAL_8250_EXTENDED && !IA64
	help
	  Say Y here if you have dumb serial boards other than the four
	  standard COM 1/2/3/4 ports. This may happen if you have an AST
	  FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
	  from <http://www.tldp.org/docs.html#howto>), or other custom
	  serial port hardware which acts similar to standard serial port
	  hardware. If you only use the standard COM 1/2/3/4 ports, you can
	  say N here to save some memory. You can also say Y if you have an
	  "intelligent" multiport card such as Cyclades, Digiboards, etc.

#
# Multi-port serial cards
#

config SERIAL_8250_FOURPORT
	tristate "Support Fourport cards"
	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
	help
	  Say Y here if you have an AST FourPort serial board.

	  To compile this driver as a module, choose M here: the module
	  will be called 8250_fourport.

config SERIAL_8250_ACCENT
	tristate "Support Accent cards"
	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
	help
	  Say Y here if you have an Accent Async serial board.

	  To compile this driver as a module, choose M here: the module
	  will be called 8250_accent.

config SERIAL_8250_BOCA
	tristate "Support Boca cards"
	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
	help
	  Say Y here if you have a Boca serial board.  Please read the Boca
	  mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>

	  To compile this driver as a module, choose M here: the module
	  will be called 8250_boca.

config SERIAL_8250_EXAR_ST16C554
	tristate "Support Exar ST16C554/554D Quad UART"
	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
	help
	  The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
	  tinkering with your Envoy TU301, or have a machine with this UART,
	  say Y here.

	  To compile this driver as a module, choose M here: the module
	  will be called 8250_exar_st16c554.

config SERIAL_8250_HUB6
	tristate "Support Hub6 cards"
	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
	help
	  Say Y here if you have a HUB6 serial board.

	  To compile this driver as a module, choose M here: the module
	  will be called 8250_hub6.

#
# Misc. options/drivers.
#

config SERIAL_8250_SHARE_IRQ
	bool "Support for sharing serial interrupts"
	depends on SERIAL_8250_EXTENDED
	help
	  Some serial boards have hardware support which allows multiple dumb
	  serial ports on the same board to share a single IRQ. To enable
	  support for this in the serial driver, say Y here.

config SERIAL_8250_DETECT_IRQ
	bool "Autodetect IRQ on standard ports (unsafe)"
	depends on SERIAL_8250_EXTENDED
	help
	  Say Y here if you want the kernel to try to guess which IRQ
	  to use for your serial port.

	  This is considered unsafe; it is far better to configure the IRQ in
	  a boot script using the setserial command.

	  If unsure, say N.

config SERIAL_8250_RSA
	bool "Support RSA serial ports"
	depends on SERIAL_8250_EXTENDED
	help
	  ::: To be written :::

config SERIAL_8250_ACORN
	tristate "Acorn expansion card serial port support"
	depends on ARCH_ACORN && SERIAL_8250
	help
	  If you have an Atomwide Serial card or Serial Port card for an Acorn
	  system, say Y to this option.  The driver can handle 1, 2, or 3 port
	  cards.  If unsure, say N.

config SERIAL_8250_FSL
	bool
	depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
	default PPC

config SERIAL_8250_DW
	tristate "Support for Synopsys DesignWare 8250 quirks"
	depends on SERIAL_8250
	help
	  Selecting this option will enable handling of the extra features
	  present in the Synopsys DesignWare APB UART.

config SERIAL_8250_EM
	tristate "Support for Emma Mobile integrated serial port"
	depends on SERIAL_8250 && ARM && HAVE_CLK
	help
	  Selecting this option will add support for the integrated serial
	  port hardware found on the Emma Mobile line of processors.
	  If unsure, say N.

config SERIAL_8250_RT288X
	bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
	depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
	help
	  If you have a Ralink RT288x/RT305x SoC based board and want to use the
	  serial port, say Y to this option. The driver can handle up to 2 serial
	  ports. If unsure, say N.
Commit	Line	Data
9bef3d41 PG	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
	6	config 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
e943f58e PB	15	port for anything. (Note that the Cyclades multi serial port driver
e943f58e PB	16	does not need this driver built in for it to work.)
9bef3d41 PG	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
9326b047 JS	35	config 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
f3014127	44	keep the 8250_core.* options around until they revert the changes
9326b047 JS	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
835d844d SY	52	config 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
9bef3d41 PG	60	config 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	---help---
	65	If you say Y here, it will be possible to use a serial port as the
	66	system console (the system console is the device which receives all
	67	kernel messages and warnings and which allows logins in single user
	68	mode). This could be useful if some terminal or printer is connected
	69	to that serial port.
	70
	71	Even if you say Y here, the currently visible virtual console
	72	(/dev/tty0) will still be used as the system console by default, but
	73	you can alter that using a kernel command line option such as
	74	"console=ttyS1". (Try "man bootparam" or see the documentation of
	75	your boot loader (grub or lilo or loadlin) about how to pass options
	76	to the kernel at boot time.)
	77
	78	If you don't have a VGA card installed and you say Y here, the
	79	kernel will automatically use the first serial line, /dev/ttyS0, as
	80	system console.
	81
	82	You can set that using a kernel command line option such as
	83	"console=uart8250,io,0x3f8,9600n8"
	84	"console=uart8250,mmio,0xff5e0000,115200n8".
	85	and it will switch to normal serial console when the corresponding
	86	port is ready.
	87	"earlycon=uart8250,io,0x3f8,9600n8"
	88	"earlycon=uart8250,mmio,0xff5e0000,115200n8".
	89	it will not only setup early console.
	90
	91	If unsure, say N.
	92
	93	config FIX_EARLYCON_MEM
	94	bool
	95	depends on X86
	96	default y
	97
	98	config SERIAL_8250_GSC
	99	tristate
	100	depends on SERIAL_8250 && GSC
	101	default SERIAL_8250
	102
9ee4b83e HK	103	config SERIAL_8250_DMA
	104	bool "DMA support for 16550 compatible UART controllers" if EXPERT
	105	depends on SERIAL_8250 && DMADEVICES=y
	106	default SERIAL_8250
	107	help
	108	This builds DMA support that can be used with 8250/16650
	109	compatible UART controllers that support DMA signaling.
	110
9bef3d41 PG	111	config SERIAL_8250_PCI
	112	tristate "8250/16550 PCI device support" if EXPERT
	113	depends on SERIAL_8250 && PCI
	114	default SERIAL_8250
	115	help
	116	This builds standard PCI serial support. You may be able to
	117	disable this feature if you only need legacy serial support.
	118	Saves about 9K.
972ce085 SS	119	Note that serial ports on NetMos 9835 Multi-I/O cards are handled
972ce085 SS	120	by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
9bef3d41	121
9bef3d41 PG	122	config SERIAL_8250_HP300
	123	tristate
	124	depends on SERIAL_8250 && HP300
	125	default SERIAL_8250
	126
	127	config SERIAL_8250_CS
	128	tristate "8250/16550 PCMCIA device support"
	129	depends on PCMCIA && SERIAL_8250
	130	---help---
	131	Say Y here to enable support for 16-bit PCMCIA serial devices,
	132	including serial port cards, modems, and the modem functions of
	133	multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
	134	credit-card size devices often used with laptops.)
	135
	136	To compile this driver as a module, choose M here: the
	137	module will be called serial_cs.
	138
	139	If unsure, say N.
	140
	141	config SERIAL_8250_NR_UARTS
	142	int "Maximum number of 8250/16550 serial ports"
	143	depends on SERIAL_8250
	144	default "4"
	145	help
	146	Set this to the number of serial ports you want the driver
	147	to support. This includes any ports discovered via ACPI or
	148	PCI enumeration and any ports that may be added at run-time
	149	via hot-plug, or any ISA multi-port serial cards.
	150
	151	config SERIAL_8250_RUNTIME_UARTS
	152	int "Number of 8250/16550 serial ports to register at runtime"
	153	depends on SERIAL_8250
	154	range 0 SERIAL_8250_NR_UARTS
	155	default "4"
	156	help
	157	Set this to the maximum number of serial ports you want
	158	the kernel to register at boot time. This can be overridden
	159	with the module parameter "nr_uarts", or boot-time parameter
	160	8250.nr_uarts
	161
	162	config SERIAL_8250_EXTENDED
	163	bool "Extended 8250/16550 serial driver options"
	164	depends on SERIAL_8250
	165	help
	166	If you wish to use any non-standard features of the standard "dumb"
	167	driver, say Y here. This includes HUB6 support, shared serial
	168	interrupts, special multiport support, support for more than the
	169	four COM 1/2/3/4 boards, etc.
	170
	171	Note that the answer to this question won't directly affect the
	172	kernel: saying N will just cause the configurator to skip all
	173	the questions about serial driver options. If unsure, say N.
	174
	175	config SERIAL_8250_MANY_PORTS
	176	bool "Support more than 4 legacy serial ports"
	177	depends on SERIAL_8250_EXTENDED && !IA64
	178	help
	179	Say Y here if you have dumb serial boards other than the four
	180	standard COM 1/2/3/4 ports. This may happen if you have an AST
	181	FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
	182	from <http://www.tldp.org/docs.html#howto>), or other custom
	183	serial port hardware which acts similar to standard serial port
	184	hardware. If you only use the standard COM 1/2/3/4 ports, you can
	185	say N here to save some memory. You can also say Y if you have an
186	"intelligent" multiport card such as Cyclades, Digiboards, etc.
187
188	#
189	# Multi-port serial cards
190	#
191
192	config SERIAL_8250_FOURPORT
193	tristate "Support Fourport cards"
194	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
195	help
196	Say Y here if you have an AST FourPort serial board.
197
198	To compile this driver as a module, choose M here: the module
199	will be called 8250_fourport.
200
201	config SERIAL_8250_ACCENT
202	tristate "Support Accent cards"
203	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
204	help
205	Say Y here if you have an Accent Async serial board.
206
207	To compile this driver as a module, choose M here: the module
208	will be called 8250_accent.
209
210	config SERIAL_8250_BOCA
211	tristate "Support Boca cards"
212	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
213	help
214	Say Y here if you have a Boca serial board. Please read the Boca
215	mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
216
217	To compile this driver as a module, choose M here: the module
218	will be called 8250_boca.
219
220	config SERIAL_8250_EXAR_ST16C554
221	tristate "Support Exar ST16C554/554D Quad UART"
222	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
223	help
224	The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
225	tinkering with your Envoy TU301, or have a machine with this UART,
226	say Y here.
227
228	To compile this driver as a module, choose M here: the module
229	will be called 8250_exar_st16c554.
230
231	config SERIAL_8250_HUB6
232	tristate "Support Hub6 cards"
233	depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
234	help
235	Say Y here if you have a HUB6 serial board.
236
237	To compile this driver as a module, choose M here: the module
238	will be called 8250_hub6.
239
240	#
241	# Misc. options/drivers.
242	#
243
244	config SERIAL_8250_SHARE_IRQ
245	bool "Support for sharing serial interrupts"
246	depends on SERIAL_8250_EXTENDED
247	help
248	Some serial boards have hardware support which allows multiple dumb
249	serial ports on the same board to share a single IRQ. To enable
250	support for this in the serial driver, say Y here.
251
252	config SERIAL_8250_DETECT_IRQ
253	bool "Autodetect IRQ on standard ports (unsafe)"
254	depends on SERIAL_8250_EXTENDED
255	help
256	Say Y here if you want the kernel to try to guess which IRQ
257	to use for your serial port.
258
259	This is considered unsafe; it is far better to configure the IRQ in
260	a boot script using the setserial command.
261
262	If unsure, say N.
263
264	config SERIAL_8250_RSA
265	bool "Support RSA serial ports"
266	depends on SERIAL_8250_EXTENDED
267	help
268	::: To be written :::
269
9bef3d41 PG	270	config SERIAL_8250_ACORN
	271	tristate "Acorn expansion card serial port support"
	272	depends on ARCH_ACORN && SERIAL_8250
	273	help
	274	If you have an Atomwide Serial card or Serial Port card for an Acorn
	275	system, say Y to this option. The driver can handle 1, 2, or 3 port
	276	cards. If unsure, say N.
	277
9bef3d41 PG	278	config SERIAL_8250_FSL
	279	bool
	280	depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
	281	default PPC
	282
	283	config SERIAL_8250_DW
	284	tristate "Support for Synopsys DesignWare 8250 quirks"
6a7320c4	285	depends on SERIAL_8250
9bef3d41 PG	286	help
	287	Selecting this option will enable handling of the extra features
	288	present in the Synopsys DesignWare APB UART.
22886ee9 MD	289
22886ee9 MD	290	config SERIAL_8250_EM
46e99c4a	291	tristate "Support for Emma Mobile integrated serial port"
22886ee9 MD	292	depends on SERIAL_8250 && ARM && HAVE_CLK
	293	help
	294	Selecting this option will add support for the integrated serial
	295	port hardware found on the Emma Mobile line of processors.
	296	If unsure, say N.
c420811f JC	297
	298	config SERIAL_8250_RT288X
	299	bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
	300	depends on SERIAL_8250 && (SOC_RT288X \|\| SOC_RT305X \|\| SOC_RT3883)
	301	help
	302	If you have a Ralink RT288x/RT305x SoC based board and want to use the
	303	serial port, say Y to this option. The driver can handle up to 2 serial
	304	ports. If unsure, say N.