[PATCH v3 14/16] fpga: region: add register/unregister functions

From: Alan Tull
Date: Thu Jul 06 2017 - 14:48:36 EST

Another step in separating common code from device tree specific
code for FPGA regions.

* add FPGA region register/unregister functions.
* add the register/unregister functions to the header
* use devm_kzalloc to alloc the region.
* add a method for getting bridges to the region struct
* add priv to the region struct
* use region->info in of_fpga_region_get_bridges

Signed-off-by: Alan Tull <atull@xxxxxxxxxx>
---
drivers/fpga/fpga-region.c | 106 ++++++++++++++++++++++++---------------
include/linux/fpga/fpga-region.h | 7 +++
2 files changed, 72 insertions(+), 41 deletions(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index a9b0133..2e6c47b 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -143,7 +143,6 @@ static struct fpga_manager *of_fpga_region_get_mgr(struct device_node *np)
/**
* of_fpga_region_get_bridges - create a list of bridges
* @region: FPGA region
- * @info: FPGA image info
*
* Create a list of bridges including the parent bridge and the bridges
* specified by "fpga-bridges" property. Note that the
@@ -156,11 +155,11 @@ static struct fpga_manager *of_fpga_region_get_mgr(struct device_node *np)
* Return 0 for success (even if there are no bridges specified)
* or -EBUSY if any of the bridges are in use.
*/
-static int of_fpga_region_get_bridges(struct fpga_region *region,
- struct fpga_image_info *info)
+static int of_fpga_region_get_bridges(struct fpga_region *region)
{
struct device *dev = &region->dev;
struct device_node *region_np = dev->of_node;
+ struct fpga_image_info *info = region->info;
struct device_node *br, *np, *parent_br = NULL;
int i, ret;

@@ -192,7 +191,7 @@ static int of_fpga_region_get_bridges(struct fpga_region *region,
continue;

/* If node is a bridge, get it and add to list */
- ret = of_fpga_bridge_get_to_list(br, region->info,
+ ret = of_fpga_bridge_get_to_list(br, info,
&region->bridge_list);

/* If any of the bridges are in use, give up */
@@ -229,10 +228,16 @@ int fpga_region_program_fpga(struct fpga_region *region)
goto err_put_region;
}

- ret = of_fpga_region_get_bridges(region, info);
- if (ret) {
- dev_err(dev, "failed to get FPGA bridges\n");
- goto err_unlock_mgr;
+ /*
+ * In some cases, we already have a list of bridges in the
+ * fpga region struct. Or we don't have any bridges.
+ */
+ if (region->get_bridges) {
+ ret = region->get_bridges(region);
+ if (ret) {
+ dev_err(dev, "failed to get fpga region bridges\n");
+ goto err_unlock_mgr;
+ }
}

ret = fpga_bridges_disable(&region->bridge_list);
@@ -259,7 +264,8 @@ int fpga_region_program_fpga(struct fpga_region *region)
return 0;

err_put_br:
- fpga_bridges_put(&region->bridge_list);
+ if (region->get_bridges)
+ fpga_bridges_put(&region->bridge_list);
err_unlock_mgr:
fpga_mgr_unlock(region->mgr);
err_put_region:
@@ -522,39 +528,20 @@ static struct notifier_block fpga_region_of_nb = {
.notifier_call = of_fpga_region_notify,
};

-static int of_fpga_region_probe(struct platform_device *pdev)
+int fpga_region_register(struct device *dev, struct fpga_region *region)
{
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- struct fpga_region *region;
- struct fpga_manager *mgr;
int id, ret = 0;

- mgr = of_fpga_region_get_mgr(np);
- if (IS_ERR(mgr))
- return -EPROBE_DEFER;
-
- region = kzalloc(sizeof(*region), GFP_KERNEL);
- if (!region) {
- ret = -ENOMEM;
- goto err_put_mgr;
- }
-
- region->mgr = mgr;
-
id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
- if (id < 0) {
- ret = id;
- goto err_kfree;
- }
+ if (id < 0)
+ return id;

mutex_init(&region->mutex);
INIT_LIST_HEAD(&region->bridge_list);
-
device_initialize(&region->dev);
region->dev.class = fpga_region_class;
region->dev.parent = dev;
- region->dev.of_node = np;
+ region->dev.of_node = dev->of_node;
region->dev.id = id;
dev_set_drvdata(dev, region);

@@ -566,19 +553,58 @@ static int of_fpga_region_probe(struct platform_device *pdev)
if (ret)
goto err_remove;

+ return 0;
+
+err_remove:
+ ida_simple_remove(&fpga_region_ida, id);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(fpga_region_register);
+
+int fpga_region_unregister(struct fpga_region *region)
+{
+ device_unregister(&region->dev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fpga_region_unregister);
+
+static int of_fpga_region_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct fpga_region *region;
+ struct fpga_manager *mgr;
+ int ret;
+
+ /* Find the FPGA mgr specified by region or parent region. */
+ mgr = of_fpga_region_get_mgr(np);
+ if (IS_ERR(mgr))
+ return -EPROBE_DEFER;
+
+ region = devm_kzalloc(dev, sizeof(*region), GFP_KERNEL);
+ if (!region) {
+ ret = -ENOMEM;
+ goto eprobe_mgr_put;
+ }
+
+ region->mgr = mgr;
+
+ /* Specify how to get bridges for this type of region. */
+ region->get_bridges = of_fpga_region_get_bridges;
+
+ ret = fpga_region_register(dev, region);
+ if (ret)
+ goto eprobe_mgr_put;
+
of_platform_populate(np, fpga_region_of_match, NULL, &region->dev);

dev_info(dev, "FPGA Region probed\n");

return 0;

-err_remove:
- ida_simple_remove(&fpga_region_ida, id);
-err_kfree:
- kfree(region);
-err_put_mgr:
+eprobe_mgr_put:
fpga_mgr_put(mgr);
-
return ret;
}

@@ -586,8 +612,7 @@ static int of_fpga_region_remove(struct platform_device *pdev)
{
struct fpga_region *region = platform_get_drvdata(pdev);

- device_unregister(&region->dev);
- fpga_mgr_put(region->mgr);
+ fpga_region_unregister(region);

return 0;
}
@@ -606,7 +631,6 @@ static void fpga_region_dev_release(struct device *dev)
struct fpga_region *region = to_fpga_region(dev);

ida_simple_remove(&fpga_region_ida, region->dev.id);
- kfree(region);
}

/**
diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
index f84a2e1..76dda68 100644
--- a/include/linux/fpga/fpga-region.h
+++ b/include/linux/fpga/fpga-region.h
@@ -12,6 +12,8 @@
* @bridge_list: list of FPGA bridges specified in region
* @mgr: FPGA manager
* @info: FPGA image info
+ * @priv: private data
+ * @get_bridges: optional function to get bridges to a list
*/
struct fpga_region {
struct device dev;
@@ -19,10 +21,15 @@ struct fpga_region {
struct list_head bridge_list;
struct fpga_manager *mgr;
struct fpga_image_info *info;
+ void *priv;
+ int (*get_bridges)(struct fpga_region *region);
};

#define to_fpga_region(d) container_of(d, struct fpga_region, dev)

int fpga_region_program_fpga(struct fpga_region *region);

+int fpga_region_register(struct device *dev, struct fpga_region *region);
+int fpga_region_unregister(struct fpga_region *region);
+
#endif /* _FPGA_REGION_H */
--
2.7.4