162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 2017, National Instruments Corp.
|
|
* Copyright (c) 2017, Xilix Inc
|
|
*
|
|
* FPGA Bridge Driver for the Xilinx LogiCORE Partial Reconfiguration
|
|
* Decoupler IP Core.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that 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.
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/fpga/fpga-bridge.h>
|
|
|
|
#define CTRL_CMD_DECOUPLE BIT(0)
|
|
#define CTRL_CMD_COUPLE 0
|
|
#define CTRL_OFFSET 0
|
|
|
|
struct xlnx_pr_decoupler_data {
|
|
void __iomem *io_base;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static inline void xlnx_pr_decoupler_write(struct xlnx_pr_decoupler_data *d,
|
|
u32 offset, u32 val)
|
|
{
|
|
writel(val, d->io_base + offset);
|
|
}
|
|
|
|
static inline u32 xlnx_pr_decouple_read(const struct xlnx_pr_decoupler_data *d,
|
|
u32 offset)
|
|
{
|
|
return readl(d->io_base + offset);
|
|
}
|
|
|
|
static int xlnx_pr_decoupler_enable_set(struct fpga_bridge *bridge, bool enable)
|
|
{
|
|
int err;
|
|
struct xlnx_pr_decoupler_data *priv = bridge->priv;
|
|
|
|
err = clk_enable(priv->clk);
|
|
if (err)
|
|
return err;
|
|
|
|
if (enable)
|
|
xlnx_pr_decoupler_write(priv, CTRL_OFFSET, CTRL_CMD_COUPLE);
|
|
else
|
|
xlnx_pr_decoupler_write(priv, CTRL_OFFSET, CTRL_CMD_DECOUPLE);
|
|
|
|
clk_disable(priv->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xlnx_pr_decoupler_enable_show(struct fpga_bridge *bridge)
|
|
{
|
|
const struct xlnx_pr_decoupler_data *priv = bridge->priv;
|
|
u32 status;
|
|
int err;
|
|
|
|
err = clk_enable(priv->clk);
|
|
if (err)
|
|
return err;
|
|
|
|
status = readl(priv->io_base);
|
|
|
|
clk_disable(priv->clk);
|
|
|
|
return !status;
|
|
}
|
|
|
|
static const struct fpga_bridge_ops xlnx_pr_decoupler_br_ops = {
|
|
.enable_set = xlnx_pr_decoupler_enable_set,
|
|
.enable_show = xlnx_pr_decoupler_enable_show,
|
|
};
|
|
|
|
static const struct of_device_id xlnx_pr_decoupler_of_match[] = {
|
|
{ .compatible = "xlnx,pr-decoupler-1.00", },
|
|
{ .compatible = "xlnx,pr-decoupler", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match);
|
|
|
|
static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
|
|
{
|
|
struct xlnx_pr_decoupler_data *priv;
|
|
int err;
|
|
struct resource *res;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
priv->io_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(priv->io_base))
|
|
return PTR_ERR(priv->io_base);
|
|
|
|
priv->clk = devm_clk_get(&pdev->dev, "aclk");
|
|
if (IS_ERR(priv->clk)) {
|
|
dev_err(&pdev->dev, "input clock not found\n");
|
|
return PTR_ERR(priv->clk);
|
|
}
|
|
|
|
err = clk_prepare_enable(priv->clk);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "unable to enable clock\n");
|
|
return err;
|
|
}
|
|
|
|
clk_disable(priv->clk);
|
|
|
|
err = fpga_bridge_register(&pdev->dev, "Xilinx PR Decoupler",
|
|
&xlnx_pr_decoupler_br_ops, priv);
|
|
|
|
if (err) {
|
|
dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler");
|
|
clk_unprepare(priv->clk);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xlnx_pr_decoupler_remove(struct platform_device *pdev)
|
|
{
|
|
struct fpga_bridge *bridge = platform_get_drvdata(pdev);
|
|
struct xlnx_pr_decoupler_data *p = bridge->priv;
|
|
|
|
fpga_bridge_unregister(&pdev->dev);
|
|
|
|
clk_unprepare(p->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver xlnx_pr_decoupler_driver = {
|
|
.probe = xlnx_pr_decoupler_probe,
|
|
.remove = xlnx_pr_decoupler_remove,
|
|
.driver = {
|
|
.name = "xlnx_pr_decoupler",
|
|
.of_match_table = of_match_ptr(xlnx_pr_decoupler_of_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(xlnx_pr_decoupler_driver);
|
|
|
|
MODULE_DESCRIPTION("Xilinx Partial Reconfiguration Decoupler");
|
|
MODULE_AUTHOR("Moritz Fischer <mdf@kernel.org>");
|
|
MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>");
|
|
MODULE_LICENSE("GPL v2");
|