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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2018-10-05 15:42:56 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-10-11 12:12:54 +0200
commita02509f301c68c9a7f01d75d7d326f7a9b81a630 (patch)
tree4e2783a20585a89abf094b38c593cb38a8472bb3 /drivers/hwtracing
parentd279a38020d2483cb75f5f82f5e4ab5f73bc94f2 (diff)
downloadlinux-stericsson-a02509f301c68c9a7f01d75d7d326f7a9b81a630.tar.gz
stm class: Factor out default framing protocol
The STP framing pattern that the stm class implicitly applies to the data payload is, in fact, a protocol. This patch moves the relevant code out of the stm core into its own driver module. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/stm/Kconfig15
-rw-r--r--drivers/hwtracing/stm/Makefile4
-rw-r--r--drivers/hwtracing/stm/p_basic.c48
3 files changed, 67 insertions, 0 deletions
diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig
index 723e2d90083d..262e7891fb97 100644
--- a/drivers/hwtracing/stm/Kconfig
+++ b/drivers/hwtracing/stm/Kconfig
@@ -11,6 +11,21 @@ config STM
if STM
+config STM_PROTO_BASIC
+ tristate "Basic STM framing protocol driver"
+ default CONFIG_STM
+ help
+ This is a simple framing protocol for sending data over STM
+ devices. This was the protocol that the STM framework used
+ exclusively until the MIPI SyS-T support was added. Use this
+ driver for compatibility with your existing STM setup.
+
+ The receiving side only needs to be able to decode the MIPI
+ STP protocol in order to extract the data.
+
+ If you want to be able to use the basic protocol or want the
+ backwards compatibility for your existing setup, say Y.
+
config STM_DUMMY
tristate "Dummy STM driver"
help
diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile
index effc19e5190f..1571de66eca4 100644
--- a/drivers/hwtracing/stm/Makefile
+++ b/drivers/hwtracing/stm/Makefile
@@ -3,6 +3,10 @@ obj-$(CONFIG_STM) += stm_core.o
stm_core-y := core.o policy.o
+obj-$(CONFIG_STM_PROTO_BASIC) += stm_p_basic.o
+
+stm_p_basic-y := p_basic.o
+
obj-$(CONFIG_STM_DUMMY) += dummy_stm.o
obj-$(CONFIG_STM_SOURCE_CONSOLE) += stm_console.o
diff --git a/drivers/hwtracing/stm/p_basic.c b/drivers/hwtracing/stm/p_basic.c
new file mode 100644
index 000000000000..8980a6a5fd6c
--- /dev/null
+++ b/drivers/hwtracing/stm/p_basic.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Basic framing protocol for STM devices.
+ * Copyright (c) 2018, Intel Corporation.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/stm.h>
+#include "stm.h"
+
+static ssize_t basic_write(struct stm_data *data, struct stm_output *output,
+ unsigned int chan, const char *buf, size_t count)
+{
+ unsigned int c = output->channel + chan;
+ unsigned int m = output->master;
+ const unsigned char nil = 0;
+ ssize_t sz;
+
+ sz = stm_data_write(data, m, c, true, buf, count);
+ if (sz > 0)
+ data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil);
+
+ return sz;
+}
+
+static const struct stm_protocol_driver basic_pdrv = {
+ .owner = THIS_MODULE,
+ .name = "p_basic",
+ .write = basic_write,
+};
+
+static int basic_stm_init(void)
+{
+ return stm_register_protocol(&basic_pdrv);
+}
+
+static void basic_stm_exit(void)
+{
+ stm_unregister_protocol(&basic_pdrv);
+}
+
+module_init(basic_stm_init);
+module_exit(basic_stm_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Basic STM framing protocol driver");
+MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");