src-test2/sys/dev/uart/uart_dev_pl011.c, branch release/11.4.0

Backport of r338074 - generalize uart_bus_probe and add SNPS support to x86

2018-11-04T23:28:56Z

Submitted by: Rajesh Kumar Differential Revision: https://reviews.freebsd.org/D17381

Revert r330897:

2018-03-29T02:50:57Z

This was intended to be a non-functional change. It wasn't. The commit message was thus wrong. In addition it broke arm, and merged crypto related code. Revert with prejudice. This revert skips files touched in r316370 since that commit was since MFCed. This revert also skips files that require $FreeBSD$ property changes. Thank you to those who helped me get out of this mess including but not limited to gonzo, kevans, rgrimes. Requested by: gjb (re)

Partial merge of the SPDX changes

2018-03-14T03:19:51Z

These changes are incomplete but are making it difficult to determine what other changes can/should be merged. No objections from: pfg

Add support for the uart classes to set their default register shift value.

2015-04-11T17:16:23Z

This is needed with the pl011 driver. Before this change it would default to a shift of 0, however the hardware places the registers at 4-byte addresses meaning the value should be 2. This patch fixes this for the pl011 when configured using the fdt. The other drivers have a default value of 0 to keep this a no-op. MFC after: 1 week

Move the uart_class definitions and fdt compat data into the individual

2015-03-07T15:24:15Z

uart implementations, and export them using the new linker-set mechanism. Differential Revision: https://reviews.freebsd.org/D1993 Submitted by: Michal Meloun

Fix the pl011 driver to work when the uart will write in zero cycles. This

2015-03-03T09:48:19Z

is the case, depending on the options, in some of the ARM hardware simulators. In these cases we don't get an interrupt so will need to schedule the task to write more data to the uart. MFC after: 1 week Sponsored by: The FreeBSD Foundation

Enable 'receive timeout' interrupt allowing us to not

2015-02-24T15:35:26Z

loose 'rx buffer full' event. This fixes operation on ARMv8 Foundation Model. Sponsored by: DARPA, AFRL

Make PL011 UART to wait on putc only when TX FIFO is full

2014-11-12T21:38:31Z

Instead of waiting for empty TX FIFO it is more reasonable to block on full FIFO. As soon as FIFO slot is free the character can be transmitted. In case of TX FIFO disabled, TXFF bit indicates that transmit register is not empty. Obtained from: Semihalf Reviewed by: andrew, emaste Sponsored by: The FreeBSD Foundation

Introduce grab and ungrab upcalls. When the kernel desires to grab the

2014-01-19T19:39:13Z

console, it calls the grab functions. These functions should turn off the RX interrupts, and any others that interfere. This makes mountroot prompt work again. If there's more generalized need other than prompting, many of these routines should be expanded to do those new things. Should have been part of r260889, but waasn't due to command line typo. Reviewed by: bde (with reservations)

Calculate the baud rate divisor rather than using a hard-coded value.

2013-10-20T23:40:16Z

Submitted by: Steven Lawrance