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serial: tegra: add internal loopback functionality 

Add the internal loopback functionality that can be enabled with
TIOCM_LOOP.

Signed-off-by: Andreas Abel <aabel@nvidia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/1565609303-27000-2-git-send-email-kyarlagadda@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Abel 2019-08-12 16:58:10 +05:30 committed by Greg Kroah-Hartman
parent d2ace81bf9
commit 6300b140c2
1 changed files with 22 additions and 4 deletions
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26
drivers/tty/serial/serial-tegra.c
View File

@ -4,7 +4,7 @@
*
* High-speed serial driver for NVIDIA Tegra SoCs
*
* Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2012-2019, NVIDIA CORPORATION. All rights reserved.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*/
@ -192,16 +192,34 @@ static void set_dtr(struct tegra_uart_port *tup, bool active)
}
}
static void set_loopbk(struct tegra_uart_port *tup, bool active)
{
unsigned long mcr = tup->mcr_shadow;
if (active)
mcr |= UART_MCR_LOOP;
else
mcr &= ~UART_MCR_LOOP;
if (mcr != tup->mcr_shadow) {
tegra_uart_write(tup, mcr, UART_MCR);
tup->mcr_shadow = mcr;
}
}
static void tegra_uart_set_mctrl(struct uart_port *u, unsigned int mctrl)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
int dtr_enable;
int enable;
tup->rts_active = !!(mctrl & TIOCM_RTS);
set_rts(tup, tup->rts_active);
dtr_enable = !!(mctrl & TIOCM_DTR);
set_dtr(tup, dtr_enable);
enable = !!(mctrl & TIOCM_DTR);
set_dtr(tup, enable);
enable = !!(mctrl & TIOCM_LOOP);
set_loopbk(tup, enable);
}
static void tegra_uart_break_ctl(struct uart_port *u, int break_ctl)