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1# SPDX-License-Identifier: GPL-2.02#3# The 8250/16550 serial drivers. You shouldn't be in this list unless4# you somehow have an implicit or explicit dependency on SERIAL_8250.5#6 7config SERIAL_82508 tristate "8250/16550 and compatible serial support"9 depends on !S39010 select SERIAL_CORE11 select SERIAL_MCTRL_GPIO if GPIOLIB12 help13 This selects whether you want to include the driver for the standard14 serial ports. The standard answer is Y. People who might say N15 here are those that are setting up dedicated Ethernet WWW/FTP16 servers, or users that have one of the various bus mice instead of a17 serial mouse and don't intend to use their machine's standard serial18 port for anything.19 20 To compile this driver as a module, choose M here: the21 module will be called 8250.22 [WARNING: Do not compile this driver as a module if you are using23 non-standard serial ports, since the configuration information will24 be lost when the driver is unloaded. This limitation may be lifted25 in the future.]26 27 BTW1: If you have a mouseman serial mouse which is not recognized by28 the X window system, try running gpm first.29 30 BTW2: If you intend to use a software modem (also called Winmodem)31 under Linux, forget it. These modems are crippled and require32 proprietary drivers which are only available under Windows.33 34 Most people will say Y or M here, so that they can use serial mice,35 modems and similar devices connecting to the standard serial ports.36 37config SERIAL_8250_DEPRECATED_OPTIONS38 bool "Support 8250_core.* kernel options (DEPRECATED)"39 depends on SERIAL_825040 default y41 help42 In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to43 accept kernel parameters in both forms like 8250_core.nr_uarts=4 and44 8250.nr_uarts=4. We now renamed the module back to 8250, but if45 anybody noticed in 3.7 and changed their userspace we still have to46 keep the 8250_core.* options around until they revert the changes47 they already did.48 49 If 8250 is built as a module, this adds 8250_core alias instead. 50 51 If you did not notice yet and/or you have userspace from pre-3.7, it52 is safe (and recommended) to say N here.53 54config SERIAL_8250_PNP55 bool "8250/16550 PNP device support" if EXPERT56 depends on SERIAL_8250 && PNP57 default y58 help59 This builds standard PNP serial support. You may be able to60 disable this feature if you only need legacy serial support.61 62config SERIAL_8250_16550A_VARIANTS63 bool "Support for variants of the 16550A serial port"64 depends on SERIAL_825065 default !X8666 help67 The 8250 driver can probe for many variants of the venerable 16550A68 serial port. Doing so takes additional time at boot.69 70 On modern systems, especially those using serial only for a simple71 console, you can say N here.72 73config SERIAL_8250_FINTEK74 bool "Support for Fintek variants"75 depends on SERIAL_825076 help77 Selecting this option will add support for the RS232 and RS48578 capabilities of the Fintek F81216A LPC to 4 UART as well similar79 variants.80 81 If this option is not selected the device will be configured as a82 standard 16550A serial port, however the device may not function83 correctly without this option enabled.84 85 If unsure, say N.86 87config SERIAL_8250_CONSOLE88 bool "Console on 8250/16550 and compatible serial port"89 depends on SERIAL_8250=y90 select SERIAL_CORE_CONSOLE91 select SERIAL_EARLYCON92 help93 If you say Y here, it will be possible to use a serial port as the94 system console (the system console is the device which receives all95 kernel messages and warnings and which allows logins in single user96 mode). This could be useful if some terminal or printer is connected97 to that serial port.98 99 Even if you say Y here, the currently visible virtual console100 (/dev/tty0) will still be used as the system console by default, but101 you can alter that using a kernel command line option such as102 "console=ttyS1". (Try "man bootparam" or see the documentation of103 your boot loader (grub or lilo or loadlin) about how to pass options104 to the kernel at boot time.)105 106 If you don't have a VGA card installed and you say Y here, the107 kernel will automatically use the first serial line, /dev/ttyS0, as108 system console.109 110 You can set that using a kernel command line option such as111 "console=uart8250,io,0x3f8,9600n8"112 "console=uart8250,mmio,0xff5e0000,115200n8".113 and it will switch to normal serial console when the corresponding114 port is ready.115 "earlycon=uart8250,io,0x3f8,9600n8"116 "earlycon=uart8250,mmio,0xff5e0000,115200n8".117 it will not only setup early console.118 119 If unsure, say N.120 121config SERIAL_8250_PARISC122 tristate123 depends on SERIAL_8250 && PARISC124 default SERIAL_8250125 126config SERIAL_8250_DMA127 bool "DMA support for 16550 compatible UART controllers" if EXPERT128 depends on SERIAL_8250 && DMADEVICES=y129 default SERIAL_8250130 help131 This builds DMA support that can be used with 8250/16650132 compatible UART controllers that support DMA signaling.133 134config SERIAL_8250_PCILIB135 bool136 137config SERIAL_8250_PCI138 tristate "8250/16550 PCI device support"139 depends on SERIAL_8250 && PCI140 select SERIAL_8250_PCILIB141 default SERIAL_8250142 help143 This builds standard PCI serial support. You may be able to144 disable this feature if you only need legacy serial support.145 Saves about 9K.146 Note that serial ports on NetMos 9835 Multi-I/O cards are handled147 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.148 149config SERIAL_8250_EXAR150 tristate "8250/16550 Exar/Commtech PCI/PCIe device support"151 depends on SERIAL_8250 && PCI152 select SERIAL_8250_PCILIB153 default SERIAL_8250154 help155 This builds support for XR17C1xx, XR17V3xx and some Commtech156 422x PCIe serial cards that are not covered by the more generic157 SERIAL_8250_PCI option.158 159config SERIAL_8250_HP300160 tristate161 depends on SERIAL_8250 && HP300162 default SERIAL_8250163 164config SERIAL_8250_CS165 tristate "8250/16550 PCMCIA device support"166 depends on PCMCIA && SERIAL_8250167 help168 Say Y here to enable support for 16-bit PCMCIA serial devices,169 including serial port cards, modems, and the modem functions of170 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are171 credit-card size devices often used with laptops.)172 173 To compile this driver as a module, choose M here: the174 module will be called serial_cs.175 176 If unsure, say N.177 178config SERIAL_8250_MEN_MCB179 tristate "MEN MCB UART device support"180 depends on MCB && SERIAL_8250181 help182 This enables support for FPGA based UARTs found on many MEN183 boards. This driver enables support for the 16z025, 16z057184 and 16z125 UARTs.185 186 To compile this driver as a module, chose M here: the187 module will be called 8250_men_mcb.188 189 190config SERIAL_8250_NR_UARTS191 int "Maximum number of 8250/16550 serial ports"192 depends on SERIAL_8250193 default "4"194 help195 Set this to the number of serial ports you want the driver196 to support. This includes any ports discovered via ACPI or197 PCI enumeration and any ports that may be added at run-time198 via hot-plug, or any ISA multi-port serial cards.199 200config SERIAL_8250_RUNTIME_UARTS201 int "Number of 8250/16550 serial ports to register at runtime"202 depends on SERIAL_8250203 range 0 SERIAL_8250_NR_UARTS204 default "4"205 help206 Set this to the maximum number of serial ports you want207 the kernel to register at boot time. This can be overridden208 with the module parameter "nr_uarts", or boot-time parameter209 8250.nr_uarts210 211config SERIAL_8250_EXTENDED212 bool "Extended 8250/16550 serial driver options"213 depends on SERIAL_8250214 help215 If you wish to use any non-standard features of the standard "dumb"216 driver, say Y here. This includes HUB6 support, shared serial217 interrupts, special multiport support, support for more than the218 four COM 1/2/3/4 boards, etc.219 220 Note that the answer to this question won't directly affect the221 kernel: saying N will just cause the configurator to skip all222 the questions about serial driver options. If unsure, say N.223 224config SERIAL_8250_MANY_PORTS225 bool "Support more than 4 legacy serial ports"226 depends on SERIAL_8250_EXTENDED227 help228 Say Y here if you have dumb serial boards other than the four229 standard COM 1/2/3/4 ports. This may happen if you have an AST230 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available231 from <https://www.tldp.org/docs.html#howto>), or other custom232 serial port hardware which acts similar to standard serial port233 hardware. If you only use the standard COM 1/2/3/4 ports, you can234 say N here to save some memory. You can also say Y if you have an235 "intelligent" multiport card such as Digiboards, etc.236 237#238# Multi-port serial cards239#240 241config SERIAL_8250_FOURPORT242 tristate "Support Fourport cards"243 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS244 help245 Say Y here if you have an AST FourPort serial board.246 247 To compile this driver as a module, choose M here: the module248 will be called 8250_fourport.249 250config SERIAL_8250_ACCENT251 tristate "Support Accent cards"252 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS253 help254 Say Y here if you have an Accent Async serial board.255 256 To compile this driver as a module, choose M here: the module257 will be called 8250_accent.258 259config SERIAL_8250_ASPEED_VUART260 tristate "Aspeed Virtual UART"261 depends on SERIAL_8250262 depends on OF263 depends on MFD_SYSCON264 depends on ARCH_ASPEED || COMPILE_TEST265 select REGMAP266 help267 If you want to use the virtual UART (VUART) device on Aspeed268 BMC platforms, enable this option. This enables the 16550A-269 compatible device on the local LPC bus, giving a UART device270 with no physical RS232 connections.271 272config SERIAL_8250_BOCA273 tristate "Support Boca cards"274 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS275 help276 Say Y here if you have a Boca serial board. Please read the Boca277 mini-HOWTO, available from <https://www.tldp.org/docs.html#howto>278 279 To compile this driver as a module, choose M here: the module280 will be called 8250_boca.281 282config SERIAL_8250_EXAR_ST16C554283 tristate "Support Exar ST16C554/554D Quad UART"284 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS285 help286 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are287 tinkering with your Envoy TU301, or have a machine with this UART,288 say Y here.289 290 To compile this driver as a module, choose M here: the module291 will be called 8250_exar_st16c554.292 293config SERIAL_8250_HUB6294 tristate "Support Hub6 cards"295 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS296 help297 Say Y here if you have a HUB6 serial board.298 299 To compile this driver as a module, choose M here: the module300 will be called 8250_hub6.301 302config SERIAL_8250_PCI1XXXX303 tristate "Microchip 8250 based serial port"304 depends on SERIAL_8250 && PCI305 select SERIAL_8250_PCILIB306 help307 Select this option if you have a setup with Microchip PCIe308 Switch with serial port enabled and wish to enable 8250309 serial driver for the serial interface. This driver support310 will ensure to support baud rates upto 1.5Mpbs.311 312#313# Misc. options/drivers.314#315 316config SERIAL_8250_SHARE_IRQ317 bool "Support for sharing serial interrupts"318 depends on SERIAL_8250_EXTENDED319 help320 Some serial boards have hardware support which allows multiple dumb321 serial ports on the same board to share a single IRQ. To enable322 support for this in the serial driver, say Y here.323 324config SERIAL_8250_DETECT_IRQ325 bool "Autodetect IRQ on standard ports (unsafe)"326 depends on SERIAL_8250_EXTENDED327 help328 Say Y here if you want the kernel to try to guess which IRQ329 to use for your serial port.330 331 This is considered unsafe; it is far better to configure the IRQ in332 a boot script using the setserial command.333 334 If unsure, say N.335 336config SERIAL_8250_RSA337 bool "Support RSA serial ports"338 depends on SERIAL_8250_EXTENDED339 help340 Say Y here if you have a IODATA RSA-DV II/S ISA card and341 would like to use its >115kbps speeds.342 You will need to provide module parameter "probe_rsa", or boot-time343 parameter 8250.probe_rsa with I/O addresses of this card then.344 345 If you don't have such card, or if unsure, say N.346 347config SERIAL_8250_DWLIB348 bool349 350config SERIAL_8250_ACORN351 tristate "Acorn expansion card serial port support"352 depends on ARCH_ACORN && SERIAL_8250353 help354 If you have an Atomwide Serial card or Serial Port card for an Acorn355 system, say Y to this option. The driver can handle 1, 2, or 3 port356 cards. If unsure, say N.357 358config SERIAL_8250_BCM2835AUX359 tristate "BCM2835 auxiliar mini UART support"360 depends on ARCH_BCM2835 || COMPILE_TEST361 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ362 help363 Support for the BCM2835 auxiliar mini UART.364 365 Features and limitations of the UART are366 Registers are similar to 16650 registers,367 set bits in the control registers that are unsupported368 are ignored and read back as 0369 7/8 bit operation with 1 start and 1 stop bit370 8 symbols deep fifo for rx and tx371 SW controlled RTS and SW readable CTS372 Clock rate derived from system clock373 Uses 8 times oversampling (compared to 16 times for 16650)374 Missing break detection (but break generation)375 Missing framing error detection376 Missing parity bit377 Missing receive time-out interrupt378 Missing DCD, DSR, DTR and RI signals379 380 If unsure, say N.381 382config SERIAL_8250_FSL383 tristate "Freescale 16550 UART support" if COMPILE_TEST && !(PPC || ARM || ARM64)384 depends on SERIAL_8250385 default SERIAL_8250 if PPC || ARM || ARM64386 help387 Selecting this option enables a workaround for a break-detection388 erratum for Freescale 16550 UARTs in the 8250 driver. It also389 enables support for ACPI enumeration.390 391config SERIAL_8250_DFL392 tristate "DFL bus driver for Altera 16550 UART"393 depends on SERIAL_8250 && FPGA_DFL394 help395 This option enables support for a Device Feature List (DFL) bus396 driver for the Altera 16550 UART. One or more Altera 16550 UARTs397 can be instantiated in a FPGA and then be discovered during398 enumeration of the DFL bus.399 400 To compile this driver as a module, chose M here: the401 module will be called 8250_dfl.402 403config SERIAL_8250_DW404 tristate "Support for Synopsys DesignWare 8250 quirks"405 depends on SERIAL_8250406 select SERIAL_8250_DWLIB407 help408 Selecting this option will enable handling of the extra features409 present in the Synopsys DesignWare APB UART.410 411config SERIAL_8250_EM412 tristate "Support for Emma Mobile integrated serial port"413 depends on SERIAL_8250 && HAVE_CLK414 depends on ARCH_RENESAS || COMPILE_TEST415 help416 Selecting this option will add support for the integrated serial417 port hardware found on the Emma Mobile line of processors.418 If unsure, say N.419 420config SERIAL_8250_IOC3421 tristate "SGI IOC3 8250 UART support"422 depends on SERIAL_8250423 depends on SGI_MFD_IOC3 || COMPILE_TEST424 select SERIAL_8250_EXTENDED425 select SERIAL_8250_SHARE_IRQ426 help427 Enable this if you have a SGI Origin or Octane machine. This module428 provides basic serial support by directly driving the UART chip429 behind the IOC3 device on those systems. Maximum baud speed is430 38400bps using this driver.431 432config SERIAL_8250_RT288X433 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"434 depends on SERIAL_8250435 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620436 help437 Selecting this option will add support for the alternate register438 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.439 If unsure, say N.440 441config SERIAL_8250_OMAP442 tristate "Support for OMAP internal UART (8250 based driver)"443 depends on SERIAL_8250444 depends on ARCH_OMAP2PLUS || ARCH_K3 || COMPILE_TEST445 help446 If you have a machine based on an Texas Instruments OMAP CPU you447 can enable its onboard serial ports by enabling this option.448 449 This driver uses ttyS instead of ttyO.450 451config SERIAL_8250_OMAP_TTYO_FIXUP452 bool "Replace ttyO with ttyS"453 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE454 default y455 help456 This option replaces the "console=ttyO" argument with the matching457 ttyS argument if the user did not specified it on the command line.458 This ensures that the user can see the kernel output during boot459 which he wouldn't see otherwise. The getty has still to be configured460 for ttyS instead of ttyO regardless of this option.461 This option is intended for people who "automatically" enable this462 driver without knowing that this driver requires a different console=463 argument. If you read this, please keep this option disabled and464 instead update your kernel command line. If you prepare a kernel for a465 distribution or other kind of larger user base then you probably want466 to keep this option enabled. Otherwise people might complain about a467 not booting kernel because the serial console remains silent in case468 they forgot to update the command line.469 470config SERIAL_8250_LPC18XX471 tristate "NXP LPC18xx/43xx serial port support"472 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)473 default ARCH_LPC18XX474 help475 If you have a LPC18xx/43xx based board and want to use the476 serial port, say Y to this option. If unsure, say Y.477 478config SERIAL_8250_MT6577479 tristate "Mediatek serial port support"480 depends on SERIAL_8250481 depends on ARCH_MEDIATEK || COMPILE_TEST482 help483 If you have a Mediatek based board and want to use the484 serial port, say Y to this option. If unsure, say N.485 486config SERIAL_8250_UNIPHIER487 tristate "Support for UniPhier on-chip UART"488 depends on SERIAL_8250489 depends on ARCH_UNIPHIER || COMPILE_TEST490 help491 If you have a UniPhier based board and want to use the on-chip492 serial ports, say Y to this option. If unsure, say N.493 494config SERIAL_8250_INGENIC495 tristate "Support for Ingenic SoC serial ports"496 depends on SERIAL_8250497 depends on OF_FLATTREE498 depends on MIPS || COMPILE_TEST499 help500 If you have a system using an Ingenic SoC and wish to make use of501 its UARTs, say Y to this option. If unsure, say N.502 503config SERIAL_8250_LPSS504 tristate "Support for serial ports on Intel LPSS platforms"505 default SERIAL_8250506 depends on SERIAL_8250 && PCI507 depends on X86 || COMPILE_TEST508 select SERIAL_8250_DWLIB509 select DW_DMAC_CORE if SERIAL_8250_DMA510 select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)511 select RATIONAL512 help513 Selecting this option will enable handling of the UART found on514 various Intel platforms such as:515 - Intel Baytrail SoC516 - Intel Braswell SoC517 - Intel Quark X1000 SoC518 that are not covered by the more generic SERIAL_8250_PCI option.519 520config SERIAL_8250_MID521 tristate "Support for serial ports on Intel MID platforms"522 default SERIAL_8250523 depends on SERIAL_8250 && PCI524 depends on X86 || COMPILE_TEST525 select HSU_DMA if SERIAL_8250_DMA526 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)527 select RATIONAL528 help529 Selecting this option will enable handling of the UART found on530 Intel Medfield SOC and various other Intel platforms that is not531 covered by the more generic SERIAL_8250_PCI option.532 533config SERIAL_8250_PERICOM534 tristate "Support for Pericom and Acces I/O serial ports"535 default SERIAL_8250536 depends on SERIAL_8250 && PCI537 help538 Selecting this option will enable handling of the Pericom and Acces539 I/O UARTs that are not covered by the more generic SERIAL_8250_PCI540 option.541 542config SERIAL_8250_PXA543 tristate "PXA serial port support"544 depends on SERIAL_8250545 depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST546 help547 If you have a machine based on an Intel XScale PXA2xx CPU you can548 enable its onboard serial ports by enabling this option. The option is549 applicable to both devicetree and legacy boards, and early console is550 part of its support.551 552config SERIAL_8250_TEGRA553 tristate "8250 support for Tegra serial ports"554 default SERIAL_8250555 depends on SERIAL_8250556 depends on ARCH_TEGRA || COMPILE_TEST557 help558 Select this option if you have machine with an NVIDIA Tegra SoC and559 wish to enable 8250 serial driver for the Tegra serial interfaces.560 561config SERIAL_8250_BCM7271562 tristate "Broadcom 8250 based serial port"563 depends on SERIAL_8250 && (ARCH_BRCMSTB || COMPILE_TEST)564 default ARCH_BRCMSTB565 help566 If you have a Broadcom STB based board and want to use the567 enhanced features of the Broadcom 8250 based serial port,568 including DMA support and high accuracy BAUD rates, say569 Y to this option. If unsure, say N.570 571config SERIAL_OF_PLATFORM572 tristate "Devicetree based probing for 8250 ports"573 depends on SERIAL_8250 && OF574 help575 This option is used for all 8250 compatible serial ports that576 are probed through devicetree, including Open Firmware based577 PowerPC systems and embedded systems on architectures using the578 flattened device tree format.579