src/sys/dev/uart/uart_dev_ns8250.c, branch releng/12.0

add snps IP uart support / genaralize UART

2018-08-19T21:10:21Z

This is an amalgam of a patch by Doug Ambrisko to generalize uart_acpi_find_device, imp moving the ACPI table to uart_dev_ns8250.c and advice by jhb to work around a bug in the EPYC 3151 BIOS (the BIOS incorrectly marks the serial ports as disabled) Reviewed by: imp MFC after: 8 weeks Differential Revision: https://reviews.freebsd.org/D16432

Add busy detect quirk to list of console options

2018-07-22T23:32:21Z

This change allows one to set the busy_detect flag required by the synopsys UART at the loader prompt. This is needed by the EPYC 3000 SoC. This will give users a working console up to the point where getty is required: hw.uart.console="mm:0xfedc9000,rs:2,bd:1" Reviewed by: imp MFC after: 4 weeks Differential Revision: https://reviews.freebsd.org/D16399

sys/dev: further adoption of SPDX licensing ID tags.

2017-11-27T14:52:40Z

Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.

uart: detect 256-byte FIFOs

2017-10-10T20:08:30Z

Submitted by: Zakary Nafziger Sponsored by: The FreeBSD Foundation

Make some UART consoles to not spin wait for data to be sent.

2017-05-01T19:47:10Z

At least with Tx FIFO enabled it shows me ~10% reduction of verbose boot time with serial console at 115200 baud. Reviewed by: marcel MFC after: 2 weeks

Add support for UART found in the Ingenic XBurst system on chips.

2016-11-17T14:41:22Z

These CPUs has non-standard UART enable bit hidden in the UART FIFO Control Register. Sponsored by: DARPA, AFRL

sys/dev: minor spelling fixes.

2016-05-03T03:41:25Z

Most affect comments, very few have user-visible effects.

Move support for Synopsys Designware APB UART out of ns8250 and into a

2016-04-01T20:26:45Z

separate driver. Add support for activating clock and hwreset resources for these devices when the EXT_RESOURCES option is present. Reviewed by: andrew, mmel, Emmanuel Vadot Approved by: adrian (mentor) Differential Revision: https://reviews.freebsd.org/D5749

Add ns16550a compatible string in UART 8250 driver

2016-02-26T08:43:36Z

Obtained from: Semihalf Submitted by: Michal Stanek Sponsored by: Annapurna Labs Approved by: cognet (mentor) Reviewed by: imp, wma Differential revision: https://reviews.freebsd.org/D5404

UART: Fix spurious interrupts generated by ns8250 and lpc drivers:

2016-02-12T05:14:58Z

- don't enable transmitter empty interrupt before filling TX FIFO. - add missing uart_barrier() call in interrupt service routine