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fpga: region: add register/unregister functions 

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@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Tull 2017-11-15 14:20:23 -06:00 committed by Greg Kroah-Hartman
parent 3b49537f80
commit 52a3a7ccce
2 changed files with 72 additions and 40 deletions
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105
drivers/fpga/fpga-region.c
View File

@ -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;
}
@ -586,7 +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_region_unregister(region);
fpga_mgr_put(region->mgr);
return 0;
@ -606,7 +632,6 @@ 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);
}
/**

7
include/linux/fpga/fpga-region.h
View File

@ -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 */