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authorBjorn Andersson <bjorn.andersson@linaro.org>2018-06-26 07:11:59 -0500
committerBjorn Andersson <bjorn.andersson@linaro.org>2018-06-26 14:09:12 -0700
commitc455daa4af3c3ee6e841fc9ed42024d6b8d50d66 (patch)
tree31ac7a50c43f4a4dfe7fd055302e54de2e35cb5f /drivers/remoteproc
parent6f8b037308ea7511191b8280efc9d0d5b46c74fe (diff)
downloadlinux-c455daa4af3c3ee6e841fc9ed42024d6b8d50d66.tar.bz2
remoteproc: Introduce prepare and unprepare for subdevices
On rare occasions a subdevice might need to prepare some hardware resources before a remote processor is booted, and clean up some state after it has been shut down. One such example is the IP Accelerator found in various Qualcomm platforms, which is accessed directly from both the modem remoteproc and the application subsystem and requires an intricate lockstep process when bringing the modem up and down. Tested-by: Fabien Dessenne <fabien.dessenne@st.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> [elder@linaro.org: minor description and comment edits] Signed-off-by Alex Elder <elder@linaro.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/remoteproc_core.c56
1 files changed, 53 insertions, 3 deletions
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 2ede7ae6f5bc..283b258f5e0f 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -776,6 +776,30 @@ static int rproc_handle_resources(struct rproc *rproc,
return ret;
}
+static int rproc_prepare_subdevices(struct rproc *rproc)
+{
+ struct rproc_subdev *subdev;
+ int ret;
+
+ list_for_each_entry(subdev, &rproc->subdevs, node) {
+ if (subdev->prepare) {
+ ret = subdev->prepare(subdev);
+ if (ret)
+ goto unroll_preparation;
+ }
+ }
+
+ return 0;
+
+unroll_preparation:
+ list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
+ if (subdev->unprepare)
+ subdev->unprepare(subdev);
+ }
+
+ return ret;
+}
+
static int rproc_start_subdevices(struct rproc *rproc)
{
struct rproc_subdev *subdev;
@@ -810,6 +834,16 @@ static void rproc_stop_subdevices(struct rproc *rproc, bool crashed)
}
}
+static void rproc_unprepare_subdevices(struct rproc *rproc)
+{
+ struct rproc_subdev *subdev;
+
+ list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
+ if (subdev->unprepare)
+ subdev->unprepare(subdev);
+ }
+}
+
/**
* rproc_coredump_cleanup() - clean up dump_segments list
* @rproc: the remote processor handle
@@ -902,11 +936,18 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
rproc->table_ptr = loaded_table;
}
+ ret = rproc_prepare_subdevices(rproc);
+ if (ret) {
+ dev_err(dev, "failed to prepare subdevices for %s: %d\n",
+ rproc->name, ret);
+ return ret;
+ }
+
/* power up the remote processor */
ret = rproc->ops->start(rproc);
if (ret) {
dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
- return ret;
+ goto unprepare_subdevices;
}
/* Start any subdevices for the remote processor */
@@ -914,8 +955,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
if (ret) {
dev_err(dev, "failed to probe subdevices for %s: %d\n",
rproc->name, ret);
- rproc->ops->stop(rproc);
- return ret;
+ goto stop_rproc;
}
rproc->state = RPROC_RUNNING;
@@ -923,6 +963,14 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
dev_info(dev, "remote processor %s is now up\n", rproc->name);
return 0;
+
+stop_rproc:
+ rproc->ops->stop(rproc);
+
+unprepare_subdevices:
+ rproc_unprepare_subdevices(rproc);
+
+ return ret;
}
/*
@@ -1035,6 +1083,8 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
return ret;
}
+ rproc_unprepare_subdevices(rproc);
+
rproc->state = RPROC_OFFLINE;
dev_info(dev, "stopped remote processor %s\n", rproc->name);