uart: Add a signal to compute rclk from baudrate

With newer, more diverse hardware designs, the rclk can be
unknown. Currently deployed systems have no standard way to discover the
baud-clock genera

uart: Add a signal to compute rclk from baudrate

With newer, more diverse hardware designs, the rclk can be
unknown. Currently deployed systems have no standard way to discover the
baud-clock generator frequency. However, sometimes we have a fairly good
idea that the firmware programmed the UART to be the baud rate that it's
telling us it's at. Create a way to instruct the uart class drivers to
compute the baud clock frequency the first time their init routines are
called. Usually the 'divisors' are relatively small, meaning we will
likely have a fairly large error (goes as 1 / (divisor + 1). However,
we also know that the baud-generator clock needs to be divided down
to the baud-rate +/- about 5% (so while the error could be large for
an arbitrary baud-clock, standard baud rates generally will give
an error of 5% or less).

Often, the console speed and the getty-configured speed are the same, so
this heuristic allows boot messages and login sessions to work.

Sponsored by: Netflix
Reviewed by: andrew
Differential Revision: https://reviews.freebsd.org/D47072

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dev/uart: Support 8-byte register access

While we only support 4-byte registers in the uart code the physical
access may be to an 8-byte register. Support this as an option on
non-i386. On i386 we l

dev/uart: Support 8-byte register access

While we only support 4-byte registers in the uart code the physical
access may be to an 8-byte register. Support this as an option on
non-i386. On i386 we lack the needed 8-byte bus_space functions.

ACPI has an option for 8-byte register io width, and FDT can be given
any size. Support these sizes, even if we don't expect to see hardware
with an 8-byte io width.

Reviewed by: imp
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D43374

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dev/uart: Use a linker set to find uart classes

When the uart is configured via the environment we need to find the
uart class with a specified name. Currently to do this with an
incomplete list of

dev/uart: Use a linker set to find uart classes

When the uart is configured via the environment we need to find the
uart class with a specified name. Currently to do this with an
incomplete list of uarts. As we may not have included all uarts in the
kernel each class is defined as weak.

Switch to a linker set so the list is always up to date based on what
is included in the kernel, and the class can be static.

Reviewed by: imp
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D43361

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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uart: Remove sbbc reference

sbbc support is for sparc64 only, which was removed in 58aa35d42975.

Sponsored by: Netflix

arm: Catch up with Samsung S3C2xx0 code removal

The code backing these uart_class was removed 7 years ago in
4648ee952520.

Sponsored by: Netflix

scc(4)/uart(4): Remove obsolete support for Siemens SAB 82532

It's no longer used since 58aa35d42975c298ca0adba705c042596303c9f5
and r357455 respectively.

Add busy detect quirk to list of console options

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 wil

Add busy detect quirk to list of console options

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

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

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

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

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.

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Merge ^/head r314270 through r314419.

Allow setting access-width for UART registers.

This is required for FDT's standard "reg-io-width" property
(similar to "reg-shift" property) found in many DTS files.

This fixes operation on Altera

Allow setting access-width for UART registers.

This is required for FDT's standard "reg-io-width" property
(similar to "reg-shift" property) found in many DTS files.

This fixes operation on Altera Arria 10 SOC Development Kit,
where standard ns8250 uart allows 4-byte access only.

Reviewed by: kan, marcel
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D9785

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MFhead@r313243

Merge ^/head r312894 through r312967.

Remove pc98 support completely.
I thank all developers and contributors for pc98.

Relnotes: yes

Merge sync of head

MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Merge r278538 through r280226.

Merge from head

Merging ^/head r279596 through r279758.

Move the uart_class definitions and fdt compat data into the individual
uart implementations, and export them using the new linker-set mechanism.

Differential Revision: https://reviews.freebsd.org/D

Move the uart_class definitions and fdt compat data into the individual
uart implementations, and export them using the new linker-set mechanism.

Differential Revision: https://reviews.freebsd.org/D1993
Submitted by: Michal Meloun

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Define new linker set, UART_FDT_CLASS_AND_DEVICE, for registering full
(class and device) FDT UART. Define second one, UART_FDT_CLASS, for UART
class only.

This paves the way for declaring uart_clas

Define new linker set, UART_FDT_CLASS_AND_DEVICE, for registering full
(class and device) FDT UART. Define second one, UART_FDT_CLASS, for UART
class only.

This paves the way for declaring uart_class data and ofw/fdt compat data
with a uart implementation, rather than needing a big global table of
compat data and weak-symbol declarations of every existing implementation.

Differential Revision: https://reviews.freebsd.org/D1992
Submitted by: Michal Meloun

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MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation