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// SPDX-License-Identifier: GPL-2.0
/*
* 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_d *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_d *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.device_node = dev->device_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->device_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);
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