n_tracerouter and n_tracesink ldisc additions.
PATCH 4/4 n_tracerouter and n_tracesink ldisc additions.
From: J Freyensee <[email protected]>
The n_tracerouter and n_tracesink line discpline drivers use the Linux tty line discpline framework to route trace data coming from a tty port (say UART for example) to the trace sink line discipline driver and to another tty port(say USB). Those these two line discipline drivers can be used together, independently from pti.c, they are part of the original implementation solution of the MIPI P1149.7, compact JTAG, PTI solution for Intel mobile platforms starting with the Medfield platform.
Signed-off-by J Freyensee <[email protected]>
--- drivers/tty/Kconfig | 31 ++++++ drivers/tty/Makefile | 2 + drivers/tty/n_tracerouter.c | 243 +++++++++++++++++++++++++++++++++++++++++++ drivers/tty/n_tracesink.c | 238 ++++++++++++++++++++++++++++++++++++++++++ drivers/tty/n_tracesink.h | 36 +++++++ include/linux/tty.h | 2 + 6 files changed, 552 insertions(+), 0 deletions(-) create mode 100644 drivers/tty/n_tracerouter.c create mode 100644 drivers/tty/n_tracesink.c create mode 100644 drivers/tty/n_tracesink.h
drivers/tty/Kconfig +31 -0
@@ -319,3 +319,34 @@ config N_GSM This line discipline provides support for the GSM MUX protocol and presents the mux as a set of 61 individual tty devices. +config TRACE_ROUTER + tristate "Trace data router for MIPI P1149.7 cJTAG standard" + depends on TRACE_SINK + default n + help + The trace router uses the Linux tty line discipline framework to + route trace data coming from a tty port (say UART for example) to + the trace sink line discipline driver and to another tty port(say + USB). This is part of a solution for the MIPI P1149.7, compact JTAG, + standard, which is for debugging mobile devices. The PTI driver in + drivers/misc/pti.c defines the majority of this MIPI solution. + + You should select this driver if the target kernel is meant for + a mobile device containing a modem. Then you will need to select + "Trace data sink for MIPI P1149.7 cJTAG standard" line discipline + driver. + +config TRACE_SINK + tristate "Trace data sink for MIPI P1149.7 cJTAG standard" + default n + help + The trace sink uses the Linux line discipline framework to receive + trace data coming from the trace router line discipline driver + to a user-defined tty port target, like USB. + This is to provide a way to extract modem trace data on + devices that do not have a PTI HW module, or just need modem + trace data to come out of a different HW output port. + This is part of a solution for the P1149.7, compact JTAG, standard. + + If you select this option, you need to select + "Trace data router for MIPI P1149.7 cJTAG standard".
drivers/tty/Makefile +2 -0
@@ -6,6 +6,8 @@ obj-$(CONFIG_AUDIT) += tty_audit.o obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o obj-$(CONFIG_N_HDLC) += n_hdlc.o obj-$(CONFIG_N_GSM) += n_gsm.o +obj-$(CONFIG_TRACE_ROUTER) += n_tracerouter.o +obj-$(CONFIG_TRACE_SINK) += n_tracesink.o obj-$(CONFIG_R3964) += n_r3964.o obj-y += vt/
drivers/tty/n_tracerouter.c new file +243 -0
243 lines not on this page · raw message
drivers/tty/n_tracesink.c new file +238 -0
238 lines not on this page · raw message
drivers/tty/n_tracesink.h new file +36 -0
@@ -0,0 +1,36 @@ +/* +* n_tracesink.h - Kernel driver API to route trace data in kernel space. +* +* Copyright (C) Intel 2011 +* +* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License version 2 +* as published by the Free Software Foundation. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +* +* The PTI (Parallel Trace Interface) driver directs trace data routed from +* various parts in the system out through the Intel Penwell PTI port and +* out of the mobile device for analysis with a debugging tool +* (Lauterbach, Fido). This is part of a solution for the MIPI P1149.7, +* compact JTAG, standard. +* +* This header file is used by n_tracerouter to be able to send the +* data of it's tty port to the tty port this module sits. This +* mechanism can also be used independent of the PTI module. +* +*/ + +#ifndef N_TRACESINK_H_ +#define N_TRACESINK_H_ + +void n_tracesink_datadrain (u8 *buf,int count); + +#endif
include/linux/tty.h +2 -0
@@ -50,6 +50,8 @@#define N_CAIF 20/* CAIF protocol for talking to modems */ #define N_GSM0710 21/* GSM 0710 Mux */ #define N_TI_WL 22/* for TI's WL BT, FM, GPS combo chips */ +#define N_TRACESINK 23/* Trace data routing for MIPI P1149.7 */ +#define N_TRACEROUTER 24/* Trace data routing for MIPI P1149.7 */ /* * This character is the same as _POSIX_VDISABLE: it cannot be used as
Signature · 1 line
1.7.2.3