forked from Minki/linux
21947ba654
This patch replaces a switch-case by a formula using rational best approximation that does necessary calculations for byt_set_termios(). Below is a list of the calculations done for all defined baud rates. Each line in a format: 1) numerator, 2) denominator, 3) prescaler, 4) Fuart, 5) port UART clock, 6) list of baud rates with DLAB values. 4 5 16 80000000 80000000 2500000(2) 14 25 16 56000000 56000000 3500000(1) 16 25 16 64000000 64000000 500000(8),1000000(4),2000000(2), 4000000(1) 24 25 16 96000000 96000000 1500000(4),3000000(2) 2180 3103 16 70254592 70254592 134(32768) 2304 3125 16 73728000 73728000 576000(8),1152000(4) 8192 15625 16 52428800 52428800 50(65536),200(16384) 9216 15625 16 58982400 58982400 1800(2048),57600(64),115200(32), 230400(16),460800(8),921600(4),1843200(2) 12288 15625 16 78643200 78643200 75(65536),150(32768),300(16384), 600(8192),1200(4096),2400(2048), 4800(1024),9600(512),19200(256),38400(128) 9893 17154 16 57671680 57671680 110(32768) Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
345 lines
12 KiB
Plaintext
345 lines
12 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 multi serial port driver
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does not need this driver built in for it to 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_DEPRECATED_OPTIONS
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bool "Support 8250_core.* kernel options (DEPRECATED)"
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depends on SERIAL_8250
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default y
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---help---
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In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
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accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
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8250.nr_uarts=4. We now renamed the module back to 8250, but if
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anybody noticed in 3.7 and changed their userspace we still have to
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keep the 8250_core.* options around until they revert the changes
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they already did.
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If 8250 is built as a module, this adds 8250_core alias instead.
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If you did not notice yet and/or you have userspace from pre-3.7, it
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is safe (and recommended) to say N here.
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config SERIAL_8250_PNP
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bool "8250/16550 PNP device support" if EXPERT
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depends on SERIAL_8250 && PNP
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default y
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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_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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select SERIAL_EARLYCON
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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 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_DMA
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bool "DMA support for 16550 compatible UART controllers" if EXPERT
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depends on SERIAL_8250 && DMADEVICES=y
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default SERIAL_8250
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help
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This builds DMA support that can be used with 8250/16650
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compatible UART controllers that support DMA signaling.
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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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select RATIONAL
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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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Note that serial ports on NetMos 9835 Multi-I/O cards are handled
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by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
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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_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_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
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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 integrated 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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config SERIAL_8250_RT288X
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bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
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depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620)
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help
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If you have a Ralink RT288x/RT305x SoC based board and want to use the
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serial port, say Y to this option. The driver can handle up to 2 serial
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ports. If unsure, say N.
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config SERIAL_8250_OMAP
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tristate "Support for OMAP internal UART (8250 based driver)"
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depends on SERIAL_8250 && ARCH_OMAP2PLUS
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help
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If you have a machine based on an Texas Instruments OMAP CPU you
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can enable its onboard serial ports by enabling this option.
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This driver uses ttyS instead of ttyO.
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config SERIAL_8250_OMAP_TTYO_FIXUP
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bool "Replace ttyO with ttyS"
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depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
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default y
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help
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This option replaces the "console=ttyO" argument with the matching
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ttyS argument if the user did not specified it on the command line.
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This ensures that the user can see the kernel output during boot
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which he wouldn't see otherwise. The getty has still to be configured
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for ttyS instead of ttyO regardless of this option.
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This option is intended for people who "automatically" enable this
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driver without knowing that this driver requires a different console=
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argument. If you read this, please keep this option disabled and
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instead update your kernel command line. If you prepare a kernel for a
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distribution or other kind of larger user base then you probably want
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to keep this option enabled. Otherwise people might complain about a
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not booting kernel because the serial console remains silent in case
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they forgot to update the command line.
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config SERIAL_8250_FINTEK
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tristate "Support for Fintek F81216A LPC to 4 UART"
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depends on SERIAL_8250 && PNP
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help
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Selecting this option will add support for the Fintek F81216A
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LPC to 4 UART. This device has some RS485 functionality not available
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through the PNP driver. If unsure, say N.
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config SERIAL_8250_MT6577
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bool "Mediatek serial port support"
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depends on SERIAL_8250 && ARCH_MEDIATEK
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help
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If you have a Mediatek based board and want to use the
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serial port, say Y to this option. If unsure, say N.
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