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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe controller EP driver for Freescale Layerscape SoCs
*
* Copyright (C) 2018 NXP Semiconductor.
*
* Author: Xiaowei Bao <xiaowei.bao@nxp.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
#include "pcie-designware.h"
#define PCIE_DBI2_OFFSET 0x1000 /* DBI2 base address*/
struct ls_pcie_ep {
struct dw_pcie *pci;
};
#define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
static int ls_pcie_establish_link(struct dw_pcie *pci)
{
return 0;
}
static const struct dw_pcie_ops ls_pcie_ep_ops = {
.start_link = ls_pcie_establish_link,
};
static const struct of_device_id ls_pcie_ep_of_match[] = {
{ .compatible = "fsl,ls-pcie-ep",},
{ },
};
static const struct pci_epc_features ls_pcie_epc_features = {
.linkup_notifier = false,
.msi_capable = true,
.msix_capable = false,
.bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4),
};
static const struct pci_epc_features*
ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
{
return &ls_pcie_epc_features;
}
static void ls_pcie_ep_init(struct dw_pcie_ep *ep)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
enum pci_barno bar;
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
dw_pcie_ep_reset_bar(pci, bar);
}
static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
enum pci_epc_irq_type type, u16 interrupt_num)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
switch (type) {
case PCI_EPC_IRQ_LEGACY:
return dw_pcie_ep_raise_legacy_irq(ep, func_no);
case PCI_EPC_IRQ_MSI:
return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
case PCI_EPC_IRQ_MSIX:
return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
default:
dev_err(pci->dev, "UNKNOWN IRQ type\n");
return -EINVAL;
}
}
static const struct dw_pcie_ep_ops pcie_ep_ops = {
.ep_init = ls_pcie_ep_init,
.raise_irq = ls_pcie_ep_raise_irq,
.get_features = ls_pcie_ep_get_features,
};
static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie,
struct platform_device *pdev)
{
struct dw_pcie *pci = pcie->pci;
struct device *dev = pci->dev;
struct dw_pcie_ep *ep;
struct resource *res;
int ret;
ep = &pci->ep;
ep->ops = &pcie_ep_ops;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
if (!res)
return -EINVAL;
ep->phys_base = res->start;
ep->addr_size = resource_size(res);
ret = dw_pcie_ep_init(ep);
if (ret) {
dev_err(dev, "failed to initialize endpoint\n");
return ret;
}
return 0;
}
static int __init ls_pcie_ep_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct ls_pcie_ep *pcie;
struct resource *dbi_base;
int ret;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
if (!pci)
return -ENOMEM;
dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
pci->dev = dev;
pci->ops = &ls_pcie_ep_ops;
pcie->pci = pci;
platform_set_drvdata(pdev, pcie);
ret = ls_add_pcie_ep(pcie, pdev);
return ret;
}
static struct platform_driver ls_pcie_ep_driver = {
.driver = {
.name = "layerscape-pcie-ep",
.of_match_table = ls_pcie_ep_of_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);
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