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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe host controller driver for Freescale Layerscape SoCs
*
* Copyright (C) 2014 Freescale Semiconductor.
* Copyright 2021 NXP
*
* Author: Minghuan Lian <Minghuan.Lian@freescale.com>
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include "pcie-designware.h"
/* PEX Internal Configuration Registers */
#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */
#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
#define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */
#define PCIE_IATU_NUM 6
struct ls_pcie {
struct dw_pcie *pci;
};
#define to_ls_pcie(x) dev_get_drvdata((x)->dev)
static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
{
struct dw_pcie *pci = pcie->pci;
u32 header_type;
header_type = ioread8(pci->dbi_base + PCI_HEADER_TYPE);
header_type &= 0x7f;
return header_type == PCI_HEADER_TYPE_BRIDGE;
}
/* Clear multi-function bit */
static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
{
struct dw_pcie *pci = pcie->pci;
iowrite8(PCI_HEADER_TYPE_BRIDGE, pci->dbi_base + PCI_HEADER_TYPE);
}
/* Drop MSG TLP except for Vendor MSG */
static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
{
u32 val;
struct dw_pcie *pci = pcie->pci;
val = ioread32(pci->dbi_base + PCIE_STRFMR1);
val &= 0xDFFFFFFF;
iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
}
/* Forward error response of outbound non-posted requests */
static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
{
struct dw_pcie *pci = pcie->pci;
iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
}
static int ls_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct ls_pcie *pcie = to_ls_pcie(pci);
ls_pcie_fix_error_response(pcie);
dw_pcie_dbi_ro_wr_en(pci);
ls_pcie_clear_multifunction(pcie);
dw_pcie_dbi_ro_wr_dis(pci);
ls_pcie_drop_msg_tlp(pcie);
return 0;
}
static const struct dw_pcie_host_ops ls_pcie_host_ops = {
.host_init = ls_pcie_host_init,
};
static const struct of_device_id ls_pcie_of_match[] = {
{ .compatible = "fsl,ls1012a-pcie", },
{ .compatible = "fsl,ls1021a-pcie", },
{ .compatible = "fsl,ls1028a-pcie", },
{ .compatible = "fsl,ls1043a-pcie", },
{ .compatible = "fsl,ls1046a-pcie", },
{ .compatible = "fsl,ls2080a-pcie", },
{ .compatible = "fsl,ls2085a-pcie", },
{ .compatible = "fsl,ls2088a-pcie", },
{ .compatible = "fsl,ls1088a-pcie", },
{ },
};
static int ls_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct ls_pcie *pcie;
struct resource *dbi_base;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
if (!pci)
return -ENOMEM;
pci->dev = dev;
pci->pp.ops = &ls_pcie_host_ops;
pcie->pci = pci;
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);
if (!ls_pcie_is_bridge(pcie))
return -ENODEV;
platform_set_drvdata(pdev, pcie);
return dw_pcie_host_init(&pci->pp);
}
static struct platform_driver ls_pcie_driver = {
.probe = ls_pcie_probe,
.driver = {
.name = "layerscape-pcie",
.of_match_table = ls_pcie_of_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(ls_pcie_driver);
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