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// SPDX-License-Identifier: GPL-2.0
/*
* Cadence PCIe platform driver.
*
* Copyright (c) 2019, Cadence Design Systems
* Author: Tom Joseph <tjoseph@cadence.com>
*/
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>
#include "pcie-cadence.h"
#define CDNS_PLAT_CPU_TO_BUS_ADDR 0x0FFFFFFF
/**
* struct cdns_plat_pcie - private data for this PCIe platform driver
* @pcie: Cadence PCIe controller
* @is_rc: Set to 1 indicates the PCIe controller mode is Root Complex,
* if 0 it is in Endpoint mode.
*/
struct cdns_plat_pcie {
struct cdns_pcie *pcie;
bool is_rc;
};
struct cdns_plat_pcie_of_data {
bool is_rc;
};
static const struct of_device_id cdns_plat_pcie_of_match[];
static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
{
return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
}
static const struct cdns_pcie_ops cdns_plat_ops = {
.cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
};
static int cdns_plat_pcie_probe(struct platform_device *pdev)
{
const struct cdns_plat_pcie_of_data *data;
struct cdns_plat_pcie *cdns_plat_pcie;
const struct of_device_id *match;
struct device *dev = &pdev->dev;
struct pci_host_bridge *bridge;
struct cdns_pcie_ep *ep;
struct cdns_pcie_rc *rc;
int phy_count;
bool is_rc;
int ret;
match = of_match_device(cdns_plat_pcie_of_match, dev);
if (!match)
return -EINVAL;
data = (struct cdns_plat_pcie_of_data *)match->data;
is_rc = data->is_rc;
pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
if (!cdns_plat_pcie)
return -ENOMEM;
platform_set_drvdata(pdev, cdns_plat_pcie);
if (is_rc) {
if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
return -ENODEV;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
if (!bridge)
return -ENOMEM;
rc = pci_host_bridge_priv(bridge);
rc->pcie.dev = dev;
rc->pcie.ops = &cdns_plat_ops;
cdns_plat_pcie->pcie = &rc->pcie;
cdns_plat_pcie->is_rc = is_rc;
ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
if (ret) {
dev_err(dev, "failed to init phy\n");
return ret;
}
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
dev_err(dev, "pm_runtime_get_sync() failed\n");
goto err_get_sync;
}
ret = cdns_pcie_host_setup(rc);
if (ret)
goto err_init;
} else {
if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
return -ENODEV;
ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
if (!ep)
return -ENOMEM;
ep->pcie.dev = dev;
ep->pcie.ops = &cdns_plat_ops;
cdns_plat_pcie->pcie = &ep->pcie;
cdns_plat_pcie->is_rc = is_rc;
ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
if (ret) {
dev_err(dev, "failed to init phy\n");
return ret;
}
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
dev_err(dev, "pm_runtime_get_sync() failed\n");
goto err_get_sync;
}
ret = cdns_pcie_ep_setup(ep);
if (ret)
goto err_init;
}
err_init:
err_get_sync:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
phy_count = cdns_plat_pcie->pcie->phy_count;
while (phy_count--)
device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
return 0;
}
static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cdns_pcie *pcie = dev_get_drvdata(dev);
int ret;
ret = pm_runtime_put_sync(dev);
if (ret < 0)
dev_dbg(dev, "pm_runtime_put_sync failed\n");
pm_runtime_disable(dev);
cdns_pcie_disable_phy(pcie);
}
static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
.is_rc = true,
};
static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
.is_rc = false,
};
static const struct of_device_id cdns_plat_pcie_of_match[] = {
{
.compatible = "cdns,cdns-pcie-host",
.data = &cdns_plat_pcie_host_of_data,
},
{
.compatible = "cdns,cdns-pcie-ep",
.data = &cdns_plat_pcie_ep_of_data,
},
{},
};
static struct platform_driver cdns_plat_pcie_driver = {
.driver = {
.name = "cdns-pcie",
.of_match_table = cdns_plat_pcie_of_match,
.pm = &cdns_pcie_pm_ops,
},
.probe = cdns_plat_pcie_probe,
.shutdown = cdns_plat_pcie_shutdown,
};
builtin_platform_driver(cdns_plat_pcie_driver);
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