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/*
* PCIe RC driver for Synopsys DesignWare Core
*
* Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com)
*
* Authors: Joao Pinto <jpmpinto@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_gpio.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
#include <linux/signal.h>
#include <linux/types.h>
#include "pcie-designware.h"
struct dw_plat_pcie {
struct pcie_port pp; /* pp.dbi_base is DT 0th resource */
};
static irqreturn_t dw_plat_pcie_msi_irq_handler(int irq, void *arg)
{
struct pcie_port *pp = arg;
return dw_handle_msi_irq(pp);
}
static void dw_plat_pcie_host_init(struct pcie_port *pp)
{
dw_pcie_setup_rc(pp);
dw_pcie_wait_for_link(pp);
if (IS_ENABLED(CONFIG_PCI_MSI))
dw_pcie_msi_init(pp);
}
static struct pcie_host_ops dw_plat_pcie_host_ops = {
.host_init = dw_plat_pcie_host_init,
};
static int dw_plat_add_pcie_port(struct pcie_port *pp,
struct platform_device *pdev)
{
struct device *dev = pp->dev;
int ret;
pp->irq = platform_get_irq(pdev, 1);
if (pp->irq < 0)
return pp->irq;
if (IS_ENABLED(CONFIG_PCI_MSI)) {
pp->msi_irq = platform_get_irq(pdev, 0);
if (pp->msi_irq < 0)
return pp->msi_irq;
ret = devm_request_irq(dev, pp->msi_irq,
dw_plat_pcie_msi_irq_handler,
IRQF_SHARED, "dw-plat-pcie-msi", pp);
if (ret) {
dev_err(dev, "failed to request MSI IRQ\n");
return ret;
}
}
pp->root_bus_nr = -1;
pp->ops = &dw_plat_pcie_host_ops;
ret = dw_pcie_host_init(pp);
if (ret) {
dev_err(dev, "failed to initialize host\n");
return ret;
}
return 0;
}
static int dw_plat_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_plat_pcie *dw_plat_pcie;
struct pcie_port *pp;
struct resource *res; /* Resource from DT */
int ret;
dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL);
if (!dw_plat_pcie)
return -ENOMEM;
pp = &dw_plat_pcie->pp;
pp->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pp->dbi_base = devm_ioremap_resource(dev, res);
if (IS_ERR(pp->dbi_base))
return PTR_ERR(pp->dbi_base);
ret = dw_plat_add_pcie_port(pp, pdev);
if (ret < 0)
return ret;
return 0;
}
static const struct of_device_id dw_plat_pcie_of_match[] = {
{ .compatible = "snps,dw-pcie", },
{},
};
static struct platform_driver dw_plat_pcie_driver = {
.driver = {
.name = "dw-pcie",
.of_match_table = dw_plat_pcie_of_match,
},
.probe = dw_plat_pcie_probe,
};
builtin_platform_driver(dw_plat_pcie_driver);
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