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fpga: region: separate out code that parses the overlay

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New function of_fpga_region_parse_ov added, moving code
from fpga_region_notify_pre_apply.  This function
gets the FPGA image info from the overlay and is able
to simplify some of the logic involved.

This is a baby step in refactoring the FPGA region code to
separate out common code from Device Tree overlay support.

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 14:20:20 -06:00 committed by Greg Kroah-Hartman
parent 61c3210239
commit c8898eda81
1 changed files with 77 additions and 53 deletions
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130
drivers/fpga/fpga-region.c
View file

@ -321,33 +321,22 @@ static int child_regions_with_firmware(struct device_node *overlay)
}
/**
* fpga_region_notify_pre_apply - pre-apply overlay notification
* of_fpga_region_parse_ov - parse and check overlay applied to region
*
* @region: FPGA region that the overlay was applied to
* @nd: overlay notification data
* @region: FPGA region
* @overlay: overlay applied to the FPGA region
*
* Called after when an overlay targeted to a FPGA Region is about to be
* applied. Function will check the properties that will be added to the FPGA
* region. If the checks pass, it will program the FPGA.
* Given an overlay applied to a FPGA region, parse the FPGA image specific
* info in the overlay and do some checking.
*
* The checks are:
* The overlay must add either firmware-name or external-fpga-config property
* to the FPGA Region.
*
* firmware-name : program the FPGA
* external-fpga-config : FPGA is already programmed
* encrypted-fpga-config : FPGA bitstream is encrypted
*
* The overlay can add other FPGA regions, but child FPGA regions cannot have a
* firmware-name property since those regions don't exist yet.
*
* If the overlay that breaks the rules, notifier returns an error and the
* overlay is rejected before it goes into the main tree.
*
* Returns 0 for success or negative error code for failure.
* Returns:
* NULL if overlay doesn't direct us to program the FPGA.
* fpga_image_info struct if there is an image to program.
* error code for invalid overlay.
*/
static int fpga_region_notify_pre_apply(struct fpga_region *region,
struct of_overlay_notify_data *nd)
static struct fpga_image_info *of_fpga_region_parse_ov(
struct fpga_region *region,
struct device_node *overlay)
{
struct device *dev = &region->dev;
struct fpga_image_info *info;
@ -356,7 +345,7 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
if (region->info) {
dev_err(dev, "Region already has overlay applied.\n");
return -EINVAL;
return ERR_PTR(-EINVAL);
}
/*
@ -364,67 +353,102 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
* firmware-name property (would mean that an FPGA region that has
* not been added to the live tree yet is doing FPGA programming).
*/
ret = child_regions_with_firmware(nd->overlay);
ret = child_regions_with_firmware(overlay);
if (ret)
return ret;
return ERR_PTR(ret);
info = fpga_image_info_alloc(dev);
if (!info)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
info->overlay = nd->overlay;
info->overlay = overlay;
/* Read FPGA region properties from the overlay */
if (of_property_read_bool(nd->overlay, "partial-fpga-config"))
if (of_property_read_bool(overlay, "partial-fpga-config"))
info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
if (of_property_read_bool(nd->overlay, "external-fpga-config"))
if (of_property_read_bool(overlay, "external-fpga-config"))
info->flags |= FPGA_MGR_EXTERNAL_CONFIG;
if (of_property_read_bool(nd->overlay, "encrypted-fpga-config"))
if (of_property_read_bool(overlay, "encrypted-fpga-config"))
info->flags |= FPGA_MGR_ENCRYPTED_BITSTREAM;
if (!of_property_read_string(nd->overlay, "firmware-name",
if (!of_property_read_string(overlay, "firmware-name",
&firmware_name)) {
info->firmware_name = devm_kstrdup(dev, firmware_name,
GFP_KERNEL);
if (!info->firmware_name)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
}
of_property_read_u32(nd->overlay, "region-unfreeze-timeout-us",
of_property_read_u32(overlay, "region-unfreeze-timeout-us",
&info->enable_timeout_us);
of_property_read_u32(nd->overlay, "region-freeze-timeout-us",
of_property_read_u32(overlay, "region-freeze-timeout-us",
&info->disable_timeout_us);
of_property_read_u32(nd->overlay, "config-complete-timeout-us",
of_property_read_u32(overlay, "config-complete-timeout-us",
&info->config_complete_timeout_us);
/* If FPGA was externally programmed, don't specify firmware */
if ((info->flags & FPGA_MGR_EXTERNAL_CONFIG) && info->firmware_name) {
dev_err(dev, "error: specified firmware and external-fpga-config");
fpga_image_info_free(info);
return -EINVAL;
}
/* FPGA is already configured externally. We're done. */
if (info->flags & FPGA_MGR_EXTERNAL_CONFIG) {
fpga_image_info_free(info);
return 0;
}
/* If we got this far, we should be programming the FPGA */
/* If overlay is not programming the FPGA, don't need FPGA image info */
if (!info->firmware_name) {
dev_err(dev, "should specify firmware-name or external-fpga-config\n");
fpga_image_info_free(info);
ret = 0;
goto ret_no_info;
}
/*
* If overlay informs us FPGA was externally programmed, specifying
* firmware here would be ambiguous.
*/
if (info->flags & FPGA_MGR_EXTERNAL_CONFIG) {
dev_err(dev, "error: specified firmware and external-fpga-config");
ret = -EINVAL;
goto ret_no_info;
}
return info;
ret_no_info:
fpga_image_info_free(info);
return ERR_PTR(ret);
}
/**
* fpga_region_notify_pre_apply - pre-apply overlay notification
*
* @region: FPGA region that the overlay was applied to
* @nd: overlay notification data
*
* Called when an overlay targeted to a FPGA Region is about to be applied.
* Parses the overlay for properties that influence how the FPGA will be
* programmed and does some checking. If the checks pass, programs the FPGA.
* If the checks fail, overlay is rejected and does not get added to the
* live tree.
*
* Returns 0 for success or negative error code for failure.
*/
static int fpga_region_notify_pre_apply(struct fpga_region *region,
struct of_overlay_notify_data *nd)
{
struct device *dev = &region->dev;
struct fpga_image_info *info;
int ret;
if (region->info) {
dev_err(dev, "Region already has overlay applied.\n");
return -EINVAL;
}
info = of_fpga_region_parse_ov(region, nd->overlay);
if (IS_ERR(info))
return PTR_ERR(info);
if (!info)
return 0;
region->info = info;
ret = fpga_region_program_fpga(region);
if (ret) {
/* error; reject overlay */
fpga_image_info_free(info);
region->info = NULL;
}