Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2017, National Instruments Corp.
 * Copyright (c) 2017, Xilix Inc
 *
 * FPGA Bridge Driver for the Xilinx LogiCORE Partial Reconfiguration
 * Decoupler IP Core.
 */
 
#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;
<------>struct fpga_bridge *br;
<------>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)) {
<------><------>if (PTR_ERR(priv->clk) != -EPROBE_DEFER)
<------><------><------>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);
 
<------>br = devm_fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler",
<------><------><------><------>     &xlnx_pr_decoupler_br_ops, priv);
<------>if (!br) {
<------><------>err = -ENOMEM;
<------><------>goto err_clk;
<------>}
 
<------>platform_set_drvdata(pdev, br);
 
<------>err = fpga_bridge_register(br);
<------>if (err) {
<------><------>dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler");
<------><------>goto err_clk;
<------>}
 
<------>return 0;
 
err_clk:
<------>clk_unprepare(priv->clk);
 
<------>return err;
}
 
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(bridge);
 
<------>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");