* FPGA Region - Device Tree support for FPGA programming under Linux
*
* Copyright (C) 2013-2016 Altera Corporation
+ * Copyright (C) 2017 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
-#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
}
EXPORT_SYMBOL_GPL(fpga_region_class_find);
-static const struct of_device_id fpga_region_of_match[] = {
- { .compatible = "fpga-region", },
- {},
-};
-MODULE_DEVICE_TABLE(of, fpga_region_of_match);
-
-static int fpga_region_of_node_match(struct device *dev, const void *data)
-{
- return dev->of_node == data;
-}
-
-/**
- * of_fpga_region_find - find FPGA region
- * @np: device node of FPGA Region
- *
- * Caller will need to put_device(®ion->dev) when done.
- *
- * Returns FPGA Region struct or NULL
- */
-static struct fpga_region *of_fpga_region_find(struct device_node *np)
-{
- return fpga_region_class_find(NULL, np, fpga_region_of_node_match);
-}
-
/**
* fpga_region_get - get an exclusive reference to a fpga region
* @region: FPGA Region struct
mutex_unlock(®ion->mutex);
}
-/**
- * of_fpga_region_get_mgr - get reference for FPGA manager
- * @np: device node of FPGA region
- *
- * Get FPGA Manager from "fpga-mgr" property or from ancestor region.
- *
- * Caller should call fpga_mgr_put() when done with manager.
- *
- * Return: fpga manager struct or IS_ERR() condition containing error code.
- */
-static struct fpga_manager *of_fpga_region_get_mgr(struct device_node *np)
-{
- struct device_node *mgr_node;
- struct fpga_manager *mgr;
-
- of_node_get(np);
- while (np) {
- if (of_device_is_compatible(np, "fpga-region")) {
- mgr_node = of_parse_phandle(np, "fpga-mgr", 0);
- if (mgr_node) {
- mgr = of_fpga_mgr_get(mgr_node);
- of_node_put(np);
- return mgr;
- }
- }
- np = of_get_next_parent(np);
- }
- of_node_put(np);
-
- return ERR_PTR(-EINVAL);
-}
-
-/**
- * of_fpga_region_get_bridges - create a list of bridges
- * @region: FPGA region
- *
- * Create a list of bridges including the parent bridge and the bridges
- * specified by "fpga-bridges" property. Note that the
- * fpga_bridges_enable/disable/put functions are all fine with an empty list
- * if that happens.
- *
- * Caller should call fpga_bridges_put(®ion->bridge_list) when
- * done with the bridges.
- *
- * 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 device *dev = ®ion->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;
-
- /* If parent is a bridge, add to list */
- ret = of_fpga_bridge_get_to_list(region_np->parent, info,
- ®ion->bridge_list);
-
- /* -EBUSY means parent is a bridge that is under use. Give up. */
- if (ret == -EBUSY)
- return ret;
-
- /* Zero return code means parent was a bridge and was added to list. */
- if (!ret)
- parent_br = region_np->parent;
-
- /* If overlay has a list of bridges, use it. */
- if (of_parse_phandle(info->overlay, "fpga-bridges", 0))
- np = info->overlay;
- else
- np = region_np;
-
- for (i = 0; ; i++) {
- br = of_parse_phandle(np, "fpga-bridges", i);
- if (!br)
- break;
-
- /* If parent bridge is in list, skip it. */
- if (br == parent_br)
- continue;
-
- /* If node is a bridge, get it and add to list */
- ret = of_fpga_bridge_get_to_list(br, info,
- ®ion->bridge_list);
-
- /* If any of the bridges are in use, give up */
- if (ret == -EBUSY) {
- fpga_bridges_put(®ion->bridge_list);
- return -EBUSY;
- }
- }
-
- return 0;
-}
-
/**
* fpga_region_program_fpga - program FPGA
* @region: FPGA region
}
EXPORT_SYMBOL_GPL(fpga_region_program_fpga);
-/**
- * child_regions_with_firmware
- * @overlay: device node of the overlay
- *
- * If the overlay adds child FPGA regions, they are not allowed to have
- * firmware-name property.
- *
- * Return 0 for OK or -EINVAL if child FPGA region adds firmware-name.
- */
-static int child_regions_with_firmware(struct device_node *overlay)
-{
- struct device_node *child_region;
- const char *child_firmware_name;
- int ret = 0;
-
- of_node_get(overlay);
-
- child_region = of_find_matching_node(overlay, fpga_region_of_match);
- while (child_region) {
- if (!of_property_read_string(child_region, "firmware-name",
- &child_firmware_name)) {
- ret = -EINVAL;
- break;
- }
- child_region = of_find_matching_node(child_region,
- fpga_region_of_match);
- }
-
- of_node_put(child_region);
-
- if (ret)
- pr_err("firmware-name not allowed in child FPGA region: %pOF",
- child_region);
-
- return ret;
-}
-
-/**
- * of_fpga_region_parse_ov - parse and check overlay applied to region
- *
- * @region: FPGA region
- * @overlay: overlay applied to the FPGA region
- *
- * Given an overlay applied to a FPGA region, parse the FPGA image specific
- * info in the overlay and do some checking.
- *
- * 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 struct fpga_image_info *of_fpga_region_parse_ov(
- struct fpga_region *region,
- struct device_node *overlay)
-{
- struct device *dev = ®ion->dev;
- struct fpga_image_info *info;
- const char *firmware_name;
- int ret;
-
- if (region->info) {
- dev_err(dev, "Region already has overlay applied.\n");
- return ERR_PTR(-EINVAL);
- }
-
- /*
- * Reject overlay if child FPGA Regions added in the overlay have
- * 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(overlay);
- if (ret)
- return ERR_PTR(ret);
-
- info = fpga_image_info_alloc(dev);
- if (!info)
- return ERR_PTR(-ENOMEM);
-
- info->overlay = overlay;
-
- /* Read FPGA region properties from the overlay */
- if (of_property_read_bool(overlay, "partial-fpga-config"))
- info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
-
- if (of_property_read_bool(overlay, "external-fpga-config"))
- info->flags |= FPGA_MGR_EXTERNAL_CONFIG;
-
- if (of_property_read_bool(overlay, "encrypted-fpga-config"))
- info->flags |= FPGA_MGR_ENCRYPTED_BITSTREAM;
-
- 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 ERR_PTR(-ENOMEM);
- }
-
- of_property_read_u32(overlay, "region-unfreeze-timeout-us",
- &info->enable_timeout_us);
-
- of_property_read_u32(overlay, "region-freeze-timeout-us",
- &info->disable_timeout_us);
-
- of_property_read_u32(overlay, "config-complete-timeout-us",
- &info->config_complete_timeout_us);
-
- /* If overlay is not programming the FPGA, don't need FPGA image info */
- if (!info->firmware_name) {
- 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);
-}
-
-/**
- * of_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 of_fpga_region_notify_pre_apply(struct fpga_region *region,
- struct of_overlay_notify_data *nd)
-{
- struct device *dev = ®ion->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;
- }
-
- return ret;
-}
-
-/**
- * of_fpga_region_notify_post_remove - post-remove overlay notification
- *
- * @region: FPGA region that was targeted by the overlay that was removed
- * @nd: overlay notification data
- *
- * Called after an overlay has been removed if the overlay's target was a
- * FPGA region.
- */
-static void of_fpga_region_notify_post_remove(struct fpga_region *region,
- struct of_overlay_notify_data *nd)
-{
- fpga_bridges_disable(®ion->bridge_list);
- fpga_bridges_put(®ion->bridge_list);
- fpga_image_info_free(region->info);
- region->info = NULL;
-}
-
-/**
- * of_fpga_region_notify - reconfig notifier for dynamic DT changes
- * @nb: notifier block
- * @action: notifier action
- * @arg: reconfig data
- *
- * This notifier handles programming a FPGA when a "firmware-name" property is
- * added to a fpga-region.
- *
- * Returns NOTIFY_OK or error if FPGA programming fails.
- */
-static int of_fpga_region_notify(struct notifier_block *nb,
- unsigned long action, void *arg)
-{
- struct of_overlay_notify_data *nd = arg;
- struct fpga_region *region;
- int ret;
-
- switch (action) {
- case OF_OVERLAY_PRE_APPLY:
- pr_debug("%s OF_OVERLAY_PRE_APPLY\n", __func__);
- break;
- case OF_OVERLAY_POST_APPLY:
- pr_debug("%s OF_OVERLAY_POST_APPLY\n", __func__);
- return NOTIFY_OK; /* not for us */
- case OF_OVERLAY_PRE_REMOVE:
- pr_debug("%s OF_OVERLAY_PRE_REMOVE\n", __func__);
- return NOTIFY_OK; /* not for us */
- case OF_OVERLAY_POST_REMOVE:
- pr_debug("%s OF_OVERLAY_POST_REMOVE\n", __func__);
- break;
- default: /* should not happen */
- return NOTIFY_OK;
- }
-
- region = of_fpga_region_find(nd->target);
- if (!region)
- return NOTIFY_OK;
-
- ret = 0;
- switch (action) {
- case OF_OVERLAY_PRE_APPLY:
- ret = of_fpga_region_notify_pre_apply(region, nd);
- break;
-
- case OF_OVERLAY_POST_REMOVE:
- of_fpga_region_notify_post_remove(region, nd);
- break;
- }
-
- put_device(®ion->dev);
-
- if (ret)
- return notifier_from_errno(ret);
-
- return NOTIFY_OK;
-}
-
-static struct notifier_block fpga_region_of_nb = {
- .notifier_call = of_fpga_region_notify,
-};
-
int fpga_region_register(struct device *dev, struct fpga_region *region)
{
int id, ret = 0;
mutex_init(®ion->mutex);
INIT_LIST_HEAD(®ion->bridge_list);
device_initialize(®ion->dev);
+ region->dev.groups = region->groups;
region->dev.class = fpga_region_class;
region->dev.parent = dev;
region->dev.of_node = dev->of_node;
}
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, ®ion->dev);
-
- dev_info(dev, "FPGA Region probed\n");
-
- return 0;
-
-eprobe_mgr_put:
- fpga_mgr_put(mgr);
- return ret;
-}
-
-static int of_fpga_region_remove(struct platform_device *pdev)
-{
- struct fpga_region *region = platform_get_drvdata(pdev);
-
- fpga_region_unregister(region);
- fpga_mgr_put(region->mgr);
-
- return 0;
-}
-
-static struct platform_driver of_fpga_region_driver = {
- .probe = of_fpga_region_probe,
- .remove = of_fpga_region_remove,
- .driver = {
- .name = "fpga-region",
- .of_match_table = of_match_ptr(fpga_region_of_match),
- },
-};
-
static void fpga_region_dev_release(struct device *dev)
{
struct fpga_region *region = to_fpga_region(dev);
*/
static int __init fpga_region_init(void)
{
- int ret;
-
fpga_region_class = class_create(THIS_MODULE, "fpga_region");
if (IS_ERR(fpga_region_class))
return PTR_ERR(fpga_region_class);
fpga_region_class->dev_release = fpga_region_dev_release;
- ret = of_overlay_notifier_register(&fpga_region_of_nb);
- if (ret)
- goto err_class;
-
- ret = platform_driver_register(&of_fpga_region_driver);
- if (ret)
- goto err_plat;
-
return 0;
-
-err_plat:
- of_overlay_notifier_unregister(&fpga_region_of_nb);
-err_class:
- class_destroy(fpga_region_class);
- ida_destroy(&fpga_region_ida);
- return ret;
}
static void __exit fpga_region_exit(void)
{
- platform_driver_unregister(&of_fpga_region_driver);
- of_overlay_notifier_unregister(&fpga_region_of_nb);
class_destroy(fpga_region_class);
ida_destroy(&fpga_region_ida);
}
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