summaryrefslogtreecommitdiffstats
path: root/drivers/pci/controller/dwc/pci-layerscape-ep.c
blob: be61d96cc95ed036e765d05afc0ab37b2707c742 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
// 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,
};

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 = BAR_0; bar <= BAR_5; 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);