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This is V2 of the Emma Mobile 8250 platform driver. The hardware itself has according to the data sheet up to 64 byte FIFOs but at this point we only make use of the 16550 compatible mode. To support this piece of hardware the common UART registers need to be remapped, and the access size differences need to be handled. The DLL and DLM registers can due to offset collision not be remapped easily, and because of that this driver makes use of ->dl_read() and ->dl_write() callbacks. This in turn requires a registration function that takes 8250-specific paramenters. Future potential enhancements include DT support, early platform driver console and fine grained PM. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: Alan Cox <alan@linux.intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
289 lines
9.8 KiB
Plaintext
289 lines
9.8 KiB
Plaintext
#
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# The 8250/16550 serial drivers. You shouldn't be in this list unless
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# you somehow have an implicit or explicit dependency on SERIAL_8250.
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#
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config SERIAL_8250
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tristate "8250/16550 and compatible serial support"
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select SERIAL_CORE
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---help---
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This selects whether you want to include the driver for the standard
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serial ports. The standard answer is Y. People who might say N
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here are those that are setting up dedicated Ethernet WWW/FTP
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servers, or users that have one of the various bus mice instead of a
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serial mouse and don't intend to use their machine's standard serial
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port for anything. (Note that the Cyclades and Stallion multi
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serial port drivers do not need this driver built in for them to
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work.)
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To compile this driver as a module, choose M here: the
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module will be called 8250.
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[WARNING: Do not compile this driver as a module if you are using
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non-standard serial ports, since the configuration information will
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be lost when the driver is unloaded. This limitation may be lifted
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in the future.]
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BTW1: If you have a mouseman serial mouse which is not recognized by
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the X window system, try running gpm first.
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BTW2: If you intend to use a software modem (also called Winmodem)
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under Linux, forget it. These modems are crippled and require
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proprietary drivers which are only available under Windows.
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Most people will say Y or M here, so that they can use serial mice,
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modems and similar devices connecting to the standard serial ports.
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config SERIAL_8250_CONSOLE
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bool "Console on 8250/16550 and compatible serial port"
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depends on SERIAL_8250=y
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select SERIAL_CORE_CONSOLE
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---help---
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If you say Y here, it will be possible to use a serial port as the
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system console (the system console is the device which receives all
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kernel messages and warnings and which allows logins in single user
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mode). This could be useful if some terminal or printer is connected
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to that serial port.
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Even if you say Y here, the currently visible virtual console
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(/dev/tty0) will still be used as the system console by default, but
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you can alter that using a kernel command line option such as
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"console=ttyS1". (Try "man bootparam" or see the documentation of
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your boot loader (grub or lilo or loadlin) about how to pass options
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to the kernel at boot time.)
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If you don't have a VGA card installed and you say Y here, the
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kernel will automatically use the first serial line, /dev/ttyS0, as
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system console.
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You can set that using a kernel command line option such as
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"console=uart8250,io,0x3f8,9600n8"
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"console=uart8250,mmio,0xff5e0000,115200n8".
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and it will switch to normal serial console when the corresponding
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port is ready.
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"earlycon=uart8250,io,0x3f8,9600n8"
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"earlycon=uart8250,mmio,0xff5e0000,115200n8".
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it will not only setup early console.
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If unsure, say N.
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config FIX_EARLYCON_MEM
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bool
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depends on X86
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default y
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config SERIAL_8250_GSC
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tristate
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depends on SERIAL_8250 && GSC
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default SERIAL_8250
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config SERIAL_8250_PCI
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tristate "8250/16550 PCI device support" if EXPERT
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depends on SERIAL_8250 && PCI
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default SERIAL_8250
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help
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This builds standard PCI serial support. You may be able to
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disable this feature if you only need legacy serial support.
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Saves about 9K.
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config SERIAL_8250_PNP
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tristate "8250/16550 PNP device support" if EXPERT
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depends on SERIAL_8250 && PNP
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default SERIAL_8250
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help
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This builds standard PNP serial support. You may be able to
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disable this feature if you only need legacy serial support.
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config SERIAL_8250_HP300
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tristate
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depends on SERIAL_8250 && HP300
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default SERIAL_8250
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config SERIAL_8250_CS
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tristate "8250/16550 PCMCIA device support"
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depends on PCMCIA && SERIAL_8250
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---help---
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Say Y here to enable support for 16-bit PCMCIA serial devices,
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including serial port cards, modems, and the modem functions of
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multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
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credit-card size devices often used with laptops.)
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To compile this driver as a module, choose M here: the
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module will be called serial_cs.
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If unsure, say N.
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config SERIAL_8250_NR_UARTS
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int "Maximum number of 8250/16550 serial ports"
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depends on SERIAL_8250
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default "4"
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help
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Set this to the number of serial ports you want the driver
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to support. This includes any ports discovered via ACPI or
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PCI enumeration and any ports that may be added at run-time
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via hot-plug, or any ISA multi-port serial cards.
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config SERIAL_8250_RUNTIME_UARTS
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int "Number of 8250/16550 serial ports to register at runtime"
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depends on SERIAL_8250
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range 0 SERIAL_8250_NR_UARTS
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default "4"
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help
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Set this to the maximum number of serial ports you want
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the kernel to register at boot time. This can be overridden
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with the module parameter "nr_uarts", or boot-time parameter
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8250.nr_uarts
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config SERIAL_8250_EXTENDED
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bool "Extended 8250/16550 serial driver options"
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depends on SERIAL_8250
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help
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If you wish to use any non-standard features of the standard "dumb"
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driver, say Y here. This includes HUB6 support, shared serial
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interrupts, special multiport support, support for more than the
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four COM 1/2/3/4 boards, etc.
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Note that the answer to this question won't directly affect the
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kernel: saying N will just cause the configurator to skip all
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the questions about serial driver options. If unsure, say N.
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config SERIAL_8250_MANY_PORTS
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bool "Support more than 4 legacy serial ports"
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depends on SERIAL_8250_EXTENDED && !IA64
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help
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Say Y here if you have dumb serial boards other than the four
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standard COM 1/2/3/4 ports. This may happen if you have an AST
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FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
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from <http://www.tldp.org/docs.html#howto>), or other custom
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serial port hardware which acts similar to standard serial port
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hardware. If you only use the standard COM 1/2/3/4 ports, you can
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say N here to save some memory. You can also say Y if you have an
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"intelligent" multiport card such as Cyclades, Digiboards, etc.
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#
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# Multi-port serial cards
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#
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config SERIAL_8250_FOURPORT
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tristate "Support Fourport cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have an AST FourPort serial board.
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To compile this driver as a module, choose M here: the module
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will be called 8250_fourport.
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config SERIAL_8250_ACCENT
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tristate "Support Accent cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have an Accent Async serial board.
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To compile this driver as a module, choose M here: the module
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will be called 8250_accent.
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config SERIAL_8250_BOCA
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tristate "Support Boca cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have a Boca serial board. Please read the Boca
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mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
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To compile this driver as a module, choose M here: the module
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will be called 8250_boca.
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config SERIAL_8250_EXAR_ST16C554
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tristate "Support Exar ST16C554/554D Quad UART"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
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tinkering with your Envoy TU301, or have a machine with this UART,
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say Y here.
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To compile this driver as a module, choose M here: the module
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will be called 8250_exar_st16c554.
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config SERIAL_8250_HUB6
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tristate "Support Hub6 cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have a HUB6 serial board.
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To compile this driver as a module, choose M here: the module
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will be called 8250_hub6.
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#
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# Misc. options/drivers.
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#
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config SERIAL_8250_SHARE_IRQ
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bool "Support for sharing serial interrupts"
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depends on SERIAL_8250_EXTENDED
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help
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Some serial boards have hardware support which allows multiple dumb
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serial ports on the same board to share a single IRQ. To enable
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support for this in the serial driver, say Y here.
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config SERIAL_8250_DETECT_IRQ
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bool "Autodetect IRQ on standard ports (unsafe)"
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depends on SERIAL_8250_EXTENDED
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help
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Say Y here if you want the kernel to try to guess which IRQ
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to use for your serial port.
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This is considered unsafe; it is far better to configure the IRQ in
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a boot script using the setserial command.
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If unsure, say N.
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config SERIAL_8250_RSA
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bool "Support RSA serial ports"
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depends on SERIAL_8250_EXTENDED
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help
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::: To be written :::
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config SERIAL_8250_MCA
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tristate "Support 8250-type ports on MCA buses"
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depends on SERIAL_8250 != n && MCA
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help
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Say Y here if you have a MCA serial ports.
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To compile this driver as a module, choose M here: the module
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will be called 8250_mca.
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config SERIAL_8250_ACORN
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tristate "Acorn expansion card serial port support"
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depends on ARCH_ACORN && SERIAL_8250
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help
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If you have an Atomwide Serial card or Serial Port card for an Acorn
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system, say Y to this option. The driver can handle 1, 2, or 3 port
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cards. If unsure, say N.
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config SERIAL_8250_RM9K
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bool "Support for MIPS RM9xxx integrated serial port"
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depends on SERIAL_8250 != n && SERIAL_RM9000
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select SERIAL_8250_SHARE_IRQ
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help
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Selecting this option will add support for the integrated serial
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port hardware found on MIPS RM9122 and similar processors.
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If unsure, say N.
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config SERIAL_8250_FSL
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bool
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depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
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default PPC
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config SERIAL_8250_DW
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tristate "Support for Synopsys DesignWare 8250 quirks"
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depends on SERIAL_8250 && OF
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help
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Selecting this option will enable handling of the extra features
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present in the Synopsys DesignWare APB UART.
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config SERIAL_8250_EM
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tristate "Support for Emma Mobile intergrated serial port"
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depends on SERIAL_8250 && ARM && HAVE_CLK
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help
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Selecting this option will add support for the integrated serial
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port hardware found on the Emma Mobile line of processors.
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If unsure, say N.
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