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authorIoana Ciornei <ioana.ciornei@nxp.com>2021-01-14 20:07:52 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-01-27 17:13:53 +0300
commit296c6264d4b19554dc8367e3f409bd248f504c2d (patch)
tree895af88d67d2a49d12313c93f449953d6699719e /drivers/bus
parent3f6099438181d269d56f9d4040d93ffae65f9e4c (diff)
downloadlinux-296c6264d4b19554dc8367e3f409bd248f504c2d.tar.xz
bus: fsl-mc: add autorescan sysfs
Add the autorescan sysfs in order to enable/disable the DPRC IRQs on which automatic rescan of the bus is performed. This is important when dynamic creation of objects is needed to happen in a timely manner because object creation can be bundled together. Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com> Link: https://lore.kernel.org/r/20210114170752.2927915-6-ciorneiioana@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/fsl-mc/dprc-driver.c17
-rw-r--r--drivers/bus/fsl-mc/fsl-mc-bus.c55
-rw-r--r--drivers/bus/fsl-mc/fsl-mc-private.h5
3 files changed, 75 insertions, 2 deletions
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 4adb6f318884..e3e2ae41c22b 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -458,8 +458,9 @@ out:
/*
* Disable and clear interrupt for a given DPRC object
*/
-static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
+int disable_dprc_irq(struct fsl_mc_device *mc_dev)
{
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
int error;
struct fsl_mc_io *mc_io = mc_dev->mc_io;
@@ -496,9 +497,18 @@ static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
return error;
}
+ mc_bus->irq_enabled = 0;
+
return 0;
}
+int get_dprc_irq_state(struct fsl_mc_device *mc_dev)
+{
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+ return mc_bus->irq_enabled;
+}
+
static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
{
int error;
@@ -525,8 +535,9 @@ static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
return 0;
}
-static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
+int enable_dprc_irq(struct fsl_mc_device *mc_dev)
{
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
int error;
/*
@@ -554,6 +565,8 @@ static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
return error;
}
+ mc_bus->irq_enabled = 1;
+
return 0;
}
diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index ee3e6252ffc3..70f4b69556f5 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -241,8 +241,63 @@ static ssize_t rescan_store(struct bus_type *bus,
}
static BUS_ATTR_WO(rescan);
+static int fsl_mc_bus_set_autorescan(struct device *dev, void *data)
+{
+ struct fsl_mc_device *root_mc_dev;
+ unsigned long val;
+ char *buf = data;
+
+ if (!fsl_mc_is_root_dprc(dev))
+ goto exit;
+
+ root_mc_dev = to_fsl_mc_device(dev);
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (val)
+ enable_dprc_irq(root_mc_dev);
+ else
+ disable_dprc_irq(root_mc_dev);
+
+exit:
+ return 0;
+}
+
+static int fsl_mc_bus_get_autorescan(struct device *dev, void *data)
+{
+ struct fsl_mc_device *root_mc_dev;
+ char *buf = data;
+
+ if (!fsl_mc_is_root_dprc(dev))
+ goto exit;
+
+ root_mc_dev = to_fsl_mc_device(dev);
+
+ sprintf(buf, "%d\n", get_dprc_irq_state(root_mc_dev));
+exit:
+ return 0;
+}
+
+static ssize_t autorescan_store(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan);
+
+ return count;
+}
+
+static ssize_t autorescan_show(struct bus_type *bus, char *buf)
+{
+ bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan);
+ return strlen(buf);
+}
+
+static BUS_ATTR_RW(autorescan);
+
static struct attribute *fsl_mc_bus_attrs[] = {
&bus_attr_rescan.attr,
+ &bus_attr_autorescan.attr,
NULL,
};
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index 42bdb8679a36..1958fa065360 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -578,6 +578,7 @@ struct fsl_mc_bus {
struct mutex scan_mutex; /* serializes bus scanning */
struct dprc_attributes dprc_attr;
struct fsl_mc_uapi uapi_misc;
+ int irq_enabled;
};
#define to_fsl_mc_bus(_mc_dev) \
@@ -656,4 +657,8 @@ static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
#endif
+int disable_dprc_irq(struct fsl_mc_device *mc_dev);
+int enable_dprc_irq(struct fsl_mc_device *mc_dev);
+int get_dprc_irq_state(struct fsl_mc_device *mc_dev);
+
#endif /* _FSL_MC_PRIVATE_H_ */