1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Cadence PCIe platform  driver.
4 *
5 * Copyright (c) 2019, Cadence Design Systems
6 * Author: Tom Joseph <tjoseph@cadence.com>
7 */
8#include <linux/kernel.h>
9#include <linux/of_address.h>
10#include <linux/of_pci.h>
11#include <linux/platform_device.h>
12#include <linux/pm_runtime.h>
13#include <linux/of_device.h>
14#include "pcie-cadence.h"
15
16#define CDNS_PLAT_CPU_TO_BUS_ADDR	0x0FFFFFFF
17
18/**
19 * struct cdns_plat_pcie - private data for this PCIe platform driver
20 * @pcie: Cadence PCIe controller
21 * @is_rc: Set to 1 indicates the PCIe controller mode is Root Complex,
22 *         if 0 it is in Endpoint mode.
23 */
24struct cdns_plat_pcie {
25	struct cdns_pcie        *pcie;
26	bool is_rc;
27};
28
29struct cdns_plat_pcie_of_data {
30	bool is_rc;
31};
32
33static const struct of_device_id cdns_plat_pcie_of_match[];
34
35static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
36{
37	return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
38}
39
40static const struct cdns_pcie_ops cdns_plat_ops = {
41	.cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
42};
43
44static int cdns_plat_pcie_probe(struct platform_device *pdev)
45{
46	const struct cdns_plat_pcie_of_data *data;
47	struct cdns_plat_pcie *cdns_plat_pcie;
48	const struct of_device_id *match;
49	struct device *dev = &pdev->dev;
50	struct pci_host_bridge *bridge;
51	struct cdns_pcie_ep *ep;
52	struct cdns_pcie_rc *rc;
53	int phy_count;
54	bool is_rc;
55	int ret;
56
57	match = of_match_device(cdns_plat_pcie_of_match, dev);
58	if (!match)
59		return -EINVAL;
60
61	data = (struct cdns_plat_pcie_of_data *)match->data;
62	is_rc = data->is_rc;
63
64	pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
65	cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
66	if (!cdns_plat_pcie)
67		return -ENOMEM;
68
69	platform_set_drvdata(pdev, cdns_plat_pcie);
70	if (is_rc) {
71		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
72			return -ENODEV;
73
74		bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
75		if (!bridge)
76			return -ENOMEM;
77
78		rc = pci_host_bridge_priv(bridge);
79		rc->pcie.dev = dev;
80		rc->pcie.ops = &cdns_plat_ops;
81		cdns_plat_pcie->pcie = &rc->pcie;
82		cdns_plat_pcie->is_rc = is_rc;
83
84		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
85		if (ret) {
86			dev_err(dev, "failed to init phy\n");
87			return ret;
88		}
89		pm_runtime_enable(dev);
90		ret = pm_runtime_get_sync(dev);
91		if (ret < 0) {
92			dev_err(dev, "pm_runtime_get_sync() failed\n");
93			goto err_get_sync;
94		}
95
96		ret = cdns_pcie_host_setup(rc);
97		if (ret)
98			goto err_init;
99	} else {
100		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
101			return -ENODEV;
102
103		ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
104		if (!ep)
105			return -ENOMEM;
106
107		ep->pcie.dev = dev;
108		ep->pcie.ops = &cdns_plat_ops;
109		cdns_plat_pcie->pcie = &ep->pcie;
110		cdns_plat_pcie->is_rc = is_rc;
111
112		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
113		if (ret) {
114			dev_err(dev, "failed to init phy\n");
115			return ret;
116		}
117
118		pm_runtime_enable(dev);
119		ret = pm_runtime_get_sync(dev);
120		if (ret < 0) {
121			dev_err(dev, "pm_runtime_get_sync() failed\n");
122			goto err_get_sync;
123		}
124
125		ret = cdns_pcie_ep_setup(ep);
126		if (ret)
127			goto err_init;
128	}
129
130	return 0;
131
132 err_init:
133 err_get_sync:
134	pm_runtime_put_sync(dev);
135	pm_runtime_disable(dev);
136	cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
137	phy_count = cdns_plat_pcie->pcie->phy_count;
138	while (phy_count--)
139		device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
140
141	return 0;
142}
143
144static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
145{
146	struct device *dev = &pdev->dev;
147	struct cdns_pcie *pcie = dev_get_drvdata(dev);
148	int ret;
149
150	ret = pm_runtime_put_sync(dev);
151	if (ret < 0)
152		dev_dbg(dev, "pm_runtime_put_sync failed\n");
153
154	pm_runtime_disable(dev);
155
156	cdns_pcie_disable_phy(pcie);
157}
158
159static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
160	.is_rc = true,
161};
162
163static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
164	.is_rc = false,
165};
166
167static const struct of_device_id cdns_plat_pcie_of_match[] = {
168	{
169		.compatible = "cdns,cdns-pcie-host",
170		.data = &cdns_plat_pcie_host_of_data,
171	},
172	{
173		.compatible = "cdns,cdns-pcie-ep",
174		.data = &cdns_plat_pcie_ep_of_data,
175	},
176	{},
177};
178
179static struct platform_driver cdns_plat_pcie_driver = {
180	.driver = {
181		.name = "cdns-pcie",
182		.of_match_table = cdns_plat_pcie_of_match,
183		.pm	= &cdns_pcie_pm_ops,
184	},
185	.probe = cdns_plat_pcie_probe,
186	.shutdown = cdns_plat_pcie_shutdown,
187};
188builtin_platform_driver(cdns_plat_pcie_driver);
189