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libpayload: Add minimal support for PL011 UART

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This creates a new PL011 config variable which avoids the
infinite busy wait on serial_putchar() because the register
mapping is not compatible with current implementation.

BUG=None
BRANCH=none
TEST=printf() works on the PL011 based ARMv8 foundation model

Original-Change-Id: I9feda35a50a3488fc504d1561444161e0889deda
Original-Signed-off-by: Marcelo Povoa <marcelogp@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/187020
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
(cherry picked from commit 85779a34a161c324cc8af995ada4393137275f20)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Conflicts:
	payloads/libpayload/Config.in
	payloads/libpayload/drivers/serial.c

Change-Id: I23c8b3728cd7d2d7692b3e86a679e061e88f7bb5
Reviewed-on: http://review.coreboot.org/7422
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Marcelo Povoa
2014-02-18 14:17:38 -08:00
committed by Marc Jones
parent d4d29a1a7e
commit 558e9b55c8
2 changed files with 255 additions and 0 deletions
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5
payloads/libpayload/Config.in
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@@ -178,6 +178,11 @@ config TEGRA_SERIAL_CONSOLE
depends on SERIAL_CONSOLE
default n
config PL011_SERIAL_CONSOLE
bool "PL011 compatible serial port driver"
depends on 8250_SERIAL_CONSOLE
default n
config SERIAL_IOBASE
## This default is currently not used on non-x86 systems.
hex "Default I/O base for the serial port (default 0x3f8)"