diff options
author | Alan Tull <atull@kernel.org> | 2017-11-15 14:20:25 -0600 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-28 16:30:38 +0100 |
commit | ef3acdd820752e0abb5f1ec899025967d0dccf3d (patch) | |
tree | 4e41f8f8ca7b04a60e62f1220747b7dd077324f5 | |
parent | 503d4b7a446b3838785fa7f21e339941a5d1c2d5 (diff) | |
download | linux-stable-ef3acdd820752e0abb5f1ec899025967d0dccf3d.tar.gz linux-stable-ef3acdd820752e0abb5f1ec899025967d0dccf3d.tar.bz2 linux-stable-ef3acdd820752e0abb5f1ec899025967d0dccf3d.zip |
fpga: region: move device tree support to of-fpga-region.c
Create of-fpga-region.c and move the following functions without
modification from fpga-region.c.
* of_fpga_region_find
* of_fpga_region_get_mgr
* of_fpga_region_get_bridges
* child_regions_with_firmware
* of_fpga_region_parse_ov
* of_fpga_region_notify_pre_apply
* of_fpga_region_notify_post_remove
* of_fpga_region_notify
* of_fpga_region_probe
* of_fpga_region_remove
Create two new functions with some code from fpga_region_init/exit.
* of_fpga_region_init
* of_fpga_region_exit
Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/fpga/Kconfig | 15 | ||||
-rw-r--r-- | drivers/fpga/Makefile | 1 | ||||
-rw-r--r-- | drivers/fpga/fpga-region.c | 452 | ||||
-rw-r--r-- | drivers/fpga/of-fpga-region.c | 496 |
4 files changed, 509 insertions, 455 deletions
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index ad5448f718b3..12bd1c760c32 100644 --- a/drivers/fpga/Kconfig +++ b/drivers/fpga/Kconfig @@ -13,10 +13,18 @@ if FPGA config FPGA_REGION tristate "FPGA Region" - depends on OF && FPGA_BRIDGE + depends on FPGA_BRIDGE + help + FPGA Region common code. A FPGA Region controls a FPGA Manager + and the FPGA Bridges associated with either a reconfigurable + region of an FPGA or a whole FPGA. + +config OF_FPGA_REGION + tristate "FPGA Region Device Tree Overlay Support" + depends on OF && FPGA_REGION help - FPGA Regions allow loading FPGA images under control of - the Device Tree. + Support for loading FPGA images by applying a Device Tree + overlay. config FPGA_MGR_ICE40_SPI tristate "Lattice iCE40 SPI" @@ -74,7 +82,6 @@ config FPGA_MGR_ZYNQ_FPGA config FPGA_BRIDGE tristate "FPGA Bridge Framework" - depends on OF help Say Y here if you want to support bridges connected between host processors and FPGAs or between FPGAs. diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index f98dcf1d89e1..3cb276a0f88d 100644 --- a/drivers/fpga/Makefile +++ b/drivers/fpga/Makefile @@ -26,3 +26,4 @@ obj-$(CONFIG_XILINX_PR_DECOUPLER) += xilinx-pr-decoupler.o # High Level Interfaces obj-$(CONFIG_FPGA_REGION) += fpga-region.o +obj-$(CONFIG_OF_FPGA_REGION) += of-fpga-region.o diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c index 5c0869576cd1..afc61885a601 100644 --- a/drivers/fpga/fpga-region.c +++ b/drivers/fpga/fpga-region.c @@ -2,6 +2,7 @@ * 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, @@ -23,7 +24,6 @@ #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> @@ -44,30 +44,6 @@ struct fpga_region *fpga_region_class_find( } 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 @@ -116,102 +92,6 @@ static void fpga_region_put(struct fpga_region *region) } /** - * 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 * Program an FPGA using fpga image info (region->info). @@ -282,259 +162,6 @@ err_put_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; @@ -576,64 +203,6 @@ int fpga_region_unregister(struct fpga_region *region) } 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); @@ -647,36 +216,17 @@ static void fpga_region_dev_release(struct device *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); } diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c new file mode 100644 index 000000000000..1533506ef0e4 --- /dev/null +++ b/drivers/fpga/of-fpga-region.c @@ -0,0 +1,496 @@ +/* + * 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, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/fpga/fpga-bridge.h> +#include <linux/fpga/fpga-mgr.h> +#include <linux/fpga/fpga-region.h> +#include <linux/idr.h> +#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> + +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); +} + +/** + * 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; +} + +/** + * 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, +}; + +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 = "of-fpga-region", + .of_match_table = of_match_ptr(fpga_region_of_match), + }, +}; + +/** + * fpga_region_init - init function for fpga_region class + * Creates the fpga_region class and registers a reconfig notifier. + */ +static int __init of_fpga_region_init(void) +{ + int ret; + + ret = of_overlay_notifier_register(&fpga_region_of_nb); + if (ret) + return ret; + + 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); + return ret; +} + +static void __exit of_fpga_region_exit(void) +{ + platform_driver_unregister(&of_fpga_region_driver); + of_overlay_notifier_unregister(&fpga_region_of_nb); +} + +subsys_initcall(of_fpga_region_init); +module_exit(of_fpga_region_exit); + +MODULE_DESCRIPTION("FPGA Region"); +MODULE_AUTHOR("Alan Tull <atull@kernel.org>"); +MODULE_LICENSE("GPL v2"); |