diff options
Diffstat (limited to 'drivers/fpga/fpga-bridge.c')
| -rw-r--r-- | drivers/fpga/fpga-bridge.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c new file mode 100644 index 0000000000..5db24cb5bd --- /dev/null +++ b/drivers/fpga/fpga-bridge.c @@ -0,0 +1,233 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * FPGA Bridge Framework Driver + * + * Copyright (C) 2013-2016 Altera Corporation, All Rights Reserved. + */ + +#include <common.h> +#include <fpga-bridge.h> + +/** + * fpga_bridge_enable - Enable transactions on the bridge + * + * @bridge: FPGA bridge + * + * Return: 0 for success, error code otherwise. + */ +int fpga_bridge_enable(struct fpga_bridge *bridge) +{ + dev_dbg(&bridge->dev, "enable\n"); + + if (bridge->br_ops && bridge->br_ops->enable_set) + return bridge->br_ops->enable_set(bridge, 1); + + return 0; +} +EXPORT_SYMBOL_GPL(fpga_bridge_enable); + +/** + * fpga_bridge_disable - Disable transactions on the bridge + * + * @bridge: FPGA bridge + * + * Return: 0 for success, error code otherwise. + */ +int fpga_bridge_disable(struct fpga_bridge *bridge) +{ + dev_dbg(&bridge->dev, "disable\n"); + + if (bridge->br_ops && bridge->br_ops->enable_set) + return bridge->br_ops->enable_set(bridge, 0); + + return 0; +} +EXPORT_SYMBOL_GPL(fpga_bridge_disable); + +/** + * of_fpga_bridge_get - get an exclusive reference to a fpga bridge + * + * @np: node pointer of a FPGA bridge + * + * Return fpga_bridge struct if successful. + * Return -EBUSY if someone already has a reference to the bridge. + * Return -ENODEV if @np is not a FPGA Bridge. + */ +struct fpga_bridge *of_fpga_bridge_get(struct device_node *np) + +{ + struct device *dev; + struct fpga_bridge *bridge; + int ret = -EPROBE_DEFER; + + dev = of_find_device_by_node(np); + if (!dev || !dev->priv) + return ERR_PTR(ret); + + bridge = dev->priv; + + return bridge; +} +EXPORT_SYMBOL_GPL(of_fpga_bridge_get); + +/** + * fpga_bridges_enable - enable bridges in a list + * @bridge_list: list of FPGA bridges + * + * Enable each bridge in the list. If list is empty, do nothing. + * + * Return 0 for success or empty bridge list; return error code otherwise. + */ +int fpga_bridges_enable(struct list_head *bridge_list) +{ + struct fpga_bridge *bridge; + int ret; + + list_for_each_entry(bridge, bridge_list, node) { + ret = fpga_bridge_enable(bridge); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(fpga_bridges_enable); + +/** + * fpga_bridges_disable - disable bridges in a list + * + * @bridge_list: list of FPGA bridges + * + * Disable each bridge in the list. If list is empty, do nothing. + * + * Return 0 for success or empty bridge list; return error code otherwise. + */ +int fpga_bridges_disable(struct list_head *bridge_list) +{ + struct fpga_bridge *bridge; + int ret; + + list_for_each_entry(bridge, bridge_list, node) { + ret = fpga_bridge_disable(bridge); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(fpga_bridges_disable); + +/** + * fpga_bridges_put - put bridges + * + * @bridge_list: list of FPGA bridges + * + * For each bridge in the list, put the bridge and remove it from the list. + * If list is empty, do nothing. + */ +void fpga_bridges_put(struct list_head *bridge_list) +{ + struct fpga_bridge *bridge, *next; + + list_for_each_entry_safe(bridge, next, bridge_list, node) + list_del(&bridge->node); +} +EXPORT_SYMBOL_GPL(fpga_bridges_put); + +/** + * fpga_bridges_get_to_list - get a bridge, add it to a list + * + * @np: node pointer of a FPGA bridge + * @bridge_list: list of FPGA bridges + * + * Get an exclusive reference to the bridge and and it to the list. + * + * Return 0 for success, error code from of_fpga_bridge_get() othewise. + */ +int fpga_bridge_get_to_list(struct device_node *np, + struct list_head *bridge_list) +{ + struct fpga_bridge *bridge; + + bridge = of_fpga_bridge_get(np); + if (IS_ERR(bridge)) + return PTR_ERR(bridge); + list_add(&bridge->node, bridge_list); + + return 0; +} +EXPORT_SYMBOL_GPL(fpga_bridge_get_to_list); + +static int set_enable(struct param_d *p, void *priv) +{ + struct fpga_bridge *bridge = priv; + + if (bridge->enable) + fpga_bridge_enable(bridge); + else + fpga_bridge_disable(bridge); + + return 0; +} + +/** + * fpga_bridge_register - register a fpga bridge driver + * @dev: FPGA bridge device from pdev + * @name: FPGA bridge name + * @br_ops: pointer to structure of fpga bridge ops + * @priv: FPGA bridge private data + * + * Return: 0 for success, error code otherwise. + */ +int fpga_bridge_register(struct device *dev, const char *name, + const struct fpga_bridge_ops *br_ops, void *priv) +{ + struct fpga_bridge *bridge; + struct param_d *p; + int ret = 0; + + if (!name || !strlen(name)) { + dev_err(dev, "Attempt to register with no name!\n"); + return -EINVAL; + } + + bridge = xzalloc(sizeof(*bridge)); + if (!bridge) + return -ENOMEM; + + INIT_LIST_HEAD(&bridge->node); + + bridge->br_ops = br_ops; + bridge->priv = priv; + + bridge->dev.parent = dev; + bridge->dev.of_node = dev->of_node; + bridge->dev.id = DEVICE_ID_DYNAMIC; + + bridge->dev.name = xstrdup(name); + + ret = register_device(&bridge->dev); + if (ret) + goto out; + + dev->priv = bridge; + + bridge->enable = 0; + p = dev_add_param_bool(&bridge->dev, "enable", set_enable, + NULL, &bridge->enable, bridge); + if (IS_ERR(p)) + return PTR_ERR(p); + + of_platform_populate(dev->of_node, NULL, dev); + + dev_info(bridge->dev.parent, "fpga bridge [%s] registered\n", + bridge->dev.name); + + return 0; + +out: + kfree(bridge); + + return ret; +} +EXPORT_SYMBOL_GPL(fpga_bridge_register); |