tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCIe host controller driver for Freescale Layerscape SoCs
4 *
5 * Copyright (C) 2014 Freescale Semiconductor.
6 * Copyright 2021 NXP
7 *
8 * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
9 */
10
11#include <linux/kernel.h>
12#include <linux/interrupt.h>
13#include <linux/init.h>
14#include <linux/of_pci.h>
15#include <linux/of_platform.h>
16#include <linux/of_irq.h>
17#include <linux/of_address.h>
18#include <linux/pci.h>
19#include <linux/platform_device.h>
20#include <linux/resource.h>
21#include <linux/mfd/syscon.h>
22#include <linux/regmap.h>
23
24#include "pcie-designware.h"
25
26/* PEX Internal Configuration Registers */
27#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */
28#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
29#define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */
30
31#define PCIE_IATU_NUM 6
32
33struct ls_pcie {
34 struct dw_pcie *pci;
35};
36
37#define to_ls_pcie(x) dev_get_drvdata((x)->dev)
38
39static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
40{
41 struct dw_pcie *pci = pcie->pci;
42 u32 header_type;
43
44 header_type = ioread8(pci->dbi_base + PCI_HEADER_TYPE);
45 header_type &= 0x7f;
46
47 return header_type == PCI_HEADER_TYPE_BRIDGE;
48}
49
50/* Clear multi-function bit */
51static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
52{
53 struct dw_pcie *pci = pcie->pci;
54
55 iowrite8(PCI_HEADER_TYPE_BRIDGE, pci->dbi_base + PCI_HEADER_TYPE);
56}
57
58/* Drop MSG TLP except for Vendor MSG */
59static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
60{
61 u32 val;
62 struct dw_pcie *pci = pcie->pci;
63
64 val = ioread32(pci->dbi_base + PCIE_STRFMR1);
65 val &= 0xDFFFFFFF;
66 iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
67}
68
69/* Forward error response of outbound non-posted requests */
70static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
71{
72 struct dw_pcie *pci = pcie->pci;
73
74 iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
75}
76
77static int ls_pcie_host_init(struct dw_pcie_rp *pp)
78{
79 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
80 struct ls_pcie *pcie = to_ls_pcie(pci);
81
82 ls_pcie_fix_error_response(pcie);
83
84 dw_pcie_dbi_ro_wr_en(pci);
85 ls_pcie_clear_multifunction(pcie);
86 dw_pcie_dbi_ro_wr_dis(pci);
87
88 ls_pcie_drop_msg_tlp(pcie);
89
90 return 0;
91}
92
93static const struct dw_pcie_host_ops ls_pcie_host_ops = {
94 .host_init = ls_pcie_host_init,
95};
96
97static const struct of_device_id ls_pcie_of_match[] = {
98 { .compatible = "fsl,ls1012a-pcie", },
99 { .compatible = "fsl,ls1021a-pcie", },
100 { .compatible = "fsl,ls1028a-pcie", },
101 { .compatible = "fsl,ls1043a-pcie", },
102 { .compatible = "fsl,ls1046a-pcie", },
103 { .compatible = "fsl,ls2080a-pcie", },
104 { .compatible = "fsl,ls2085a-pcie", },
105 { .compatible = "fsl,ls2088a-pcie", },
106 { .compatible = "fsl,ls1088a-pcie", },
107 { },
108};
109
110static int ls_pcie_probe(struct platform_device *pdev)
111{
112 struct device *dev = &pdev->dev;
113 struct dw_pcie *pci;
114 struct ls_pcie *pcie;
115 struct resource *dbi_base;
116
117 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
118 if (!pcie)
119 return -ENOMEM;
120
121 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
122 if (!pci)
123 return -ENOMEM;
124
125 pci->dev = dev;
126 pci->pp.ops = &ls_pcie_host_ops;
127
128 pcie->pci = pci;
129
130 dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
131 pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
132 if (IS_ERR(pci->dbi_base))
133 return PTR_ERR(pci->dbi_base);
134
135 if (!ls_pcie_is_bridge(pcie))
136 return -ENODEV;
137
138 platform_set_drvdata(pdev, pcie);
139
140 return dw_pcie_host_init(&pci->pp);
141}
142
143static struct platform_driver ls_pcie_driver = {
144 .probe = ls_pcie_probe,
145 .driver = {
146 .name = "layerscape-pcie",
147 .of_match_table = ls_pcie_of_match,
148 .suppress_bind_attrs = true,
149 },
150};
151builtin_platform_driver(ls_pcie_driver);