152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
// 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);
|