cvs commit: src/sys/dev/uart uart.h uart_bus.h uart_bus_acpi.c uart_bus_ebus.c uart_bus_isa.c uart_bus_pci.c uart_bus_puc.c uart_core.c uart_cpu.h uart_cpu_alpha.c uart_cpu_amd64.c uart_cpu_i386.c uart_cpu_ia64.c uart_cpu_sparc64.c ...

Marcel Moolenaar marcel at
Sat Sep 6 16:13:49 PDT 2003

marcel      2003/09/06 16:13:47 PDT

  FreeBSD src repository

  Added files:
    sys/dev/uart         uart.h uart_bus.h uart_bus_acpi.c 
                         uart_bus_ebus.c uart_bus_isa.c 
                         uart_bus_pci.c uart_bus_puc.c uart_core.c 
                         uart_cpu.h uart_cpu_alpha.c 
                         uart_cpu_amd64.c uart_cpu_i386.c 
                         uart_cpu_ia64.c uart_cpu_sparc64.c 
                         uart_dev_ns8250.c uart_dev_ns8250.h 
                         uart_dev_sab82532.c uart_dev_sab82532.h 
                         uart_dev_z8530.c uart_dev_z8530.h 
                         uart_if.m uart_tty.c 
    share/man/man4       uart.4 
  The uart(4) driver is an universal driver for various UART hardware.
  It improves on sio(4) in the following areas:
  o  Fully newbusified to allow for memory mapped I/O. This is a must
     for ia64 and sparc64,
  o  Machine dependent code to take full advantage of machine and firm-
     ware specific ways to define serial consoles and/or debug ports.
  o  Hardware abstraction layer to allow the driver to be used with
     various UARTs, such as the well-known ns8250 family of UARTs, the
     Siemens sab82532 or the Zilog Z8530. This is especially important
     for pc98 and sparc64 where it's common to have different UARTs,
  o  The notion of system devices to unkludge low-level consoles and
     remote gdb ports and provides the mechanics necessary to support
     the keyboard on sparc64 (which is UART based).
  o  The notion of a kernel interface so that a UART can be tied to
     something other than the well-known TTY interface. This is needed
     on sparc64 to present the user with a device and ioctl handling
     suitable for a keyboard, but also allows us to cleanly hide an
     UART when used as a debug port.
  Following is a list of features and bugs/flaws specific to the ns8250
  family of UARTs as compared to their support in sio(4):
  o  The uart(4) driver determines the FIFO size and automaticly takes
     advantages of larger FIFOs and/or additional features. Note that
     since I don't have sufficient access to 16[679]5x UARTs, hardware
     flow control has not been enabled. This is almost trivial to do,
     provided one can test. The downside of this is that broken UARTs
     are more likely to not work correctly with uart(4). The need for
     tunables or knobs may be large enough to warrant their creation.
  o  The uart(4) driver does not share the same bumpy history as sio(4)
     and will therefore not provide the necessary hooks, tweaks, quirks
     or work-arounds to deal with once common hardware. To that extend,
     uart(4) supports a subset of the UARTs that sio(4) supports. The
     question before us is whether the subset is sufficient for current
  o  There is no support for multiport UARTs in uart(4). The decision
     behind this is that uart(4) deals with one EIA RS232-C interface.
     Packaging of multiple interfaces in a single chip or on a single
     expansion board is beyond the scope of uart(4) and is now mostly
     left for puc(4) to deal with. Lack of hardware made it impossible
     to actually implement such a dependency other than is present for
     the dual channel SAB82532 and Z8350 SCCs.
  The current list of missing features is:
  o  No configuration capabilities. A set of tunables and sysctls is
     being worked out. There are likely not going to be any or much
     compile-time knobs. Such configuration does not fit well with
     current hardware.
  o  No support for the PPS API. This is partly dependent on the
     ability to configure uart(4) and partly dependent on having
     sufficient information to implement it properly.
  As usual, the manpage is present but lacks the attention the
  software has gotten.
  Revision  Changes    Path
  1.1       +115 -0    src/share/man/man4/uart.4 (new)
  1.1       +82 -0     src/sys/dev/uart/uart.h (new)
  1.1       +204 -0    src/sys/dev/uart/uart_bus.h (new)
  1.1       +83 -0     src/sys/dev/uart/uart_bus_acpi.c (new)
  1.1       +85 -0     src/sys/dev/uart/uart_bus_ebus.c (new)
  1.1       +167 -0    src/sys/dev/uart/uart_bus_isa.c (new)
  1.1       +118 -0    src/sys/dev/uart/uart_bus_pci.c (new)
  1.1       +94 -0     src/sys/dev/uart/uart_bus_puc.c (new)
  1.1       +452 -0    src/sys/dev/uart/uart_core.c (new)
  1.1       +115 -0    src/sys/dev/uart/uart_cpu.h (new)
  1.1       +111 -0    src/sys/dev/uart/uart_cpu_alpha.c (new)
  1.1       +92 -0     src/sys/dev/uart/uart_cpu_amd64.c (new)
  1.1       +92 -0     src/sys/dev/uart/uart_cpu_i386.c (new)
  1.1       +139 -0    src/sys/dev/uart/uart_cpu_ia64.c (new)
  1.1       +156 -0    src/sys/dev/uart/uart_cpu_sparc64.c (new)
  1.1       +726 -0    src/sys/dev/uart/uart_dev_ns8250.c (new)
  1.1       +153 -0    src/sys/dev/uart/uart_dev_ns8250.h (new)
  1.1       +670 -0    src/sys/dev/uart/uart_dev_sab82532.c (new)
  1.1       +320 -0    src/sys/dev/uart/uart_dev_sab82532.h (new)
  1.1       +512 -0    src/sys/dev/uart/uart_dev_z8530.c (new)
  1.1       +252 -0    src/sys/dev/uart/uart_dev_z8530.h (new)
  1.1       +138 -0    src/sys/dev/uart/uart_if.m (new)
  1.1       +569 -0    src/sys/dev/uart/uart_tty.c (new)

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