tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/**
17 * struct cdns_plat_pcie - private data for this PCIe platform driver
18 * @pcie: Cadence PCIe controller
19 * @is_rc: Set to 1 indicates the PCIe controller mode is Root Complex,
20 * if 0 it is in Endpoint mode.
21 */
22struct cdns_plat_pcie {
23 struct cdns_pcie *pcie;
24 bool is_rc;
25};
26
27struct cdns_plat_pcie_of_data {
28 bool is_rc;
29};
30
31static const struct of_device_id cdns_plat_pcie_of_match[];
32
33static int cdns_plat_pcie_probe(struct platform_device *pdev)
34{
35 const struct cdns_plat_pcie_of_data *data;
36 struct cdns_plat_pcie *cdns_plat_pcie;
37 const struct of_device_id *match;
38 struct device *dev = &pdev->dev;
39 struct pci_host_bridge *bridge;
40 struct cdns_pcie_ep *ep;
41 struct cdns_pcie_rc *rc;
42 int phy_count;
43 bool is_rc;
44 int ret;
45
46 match = of_match_device(cdns_plat_pcie_of_match, dev);
47 if (!match)
48 return -EINVAL;
49
50 data = (struct cdns_plat_pcie_of_data *)match->data;
51 is_rc = data->is_rc;
52
53 pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
54 cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
55 if (!cdns_plat_pcie)
56 return -ENOMEM;
57
58 platform_set_drvdata(pdev, cdns_plat_pcie);
59 if (is_rc) {
60 if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
61 return -ENODEV;
62
63 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
64 if (!bridge)
65 return -ENOMEM;
66
67 rc = pci_host_bridge_priv(bridge);
68 rc->pcie.dev = dev;
69 cdns_plat_pcie->pcie = &rc->pcie;
70 cdns_plat_pcie->is_rc = is_rc;
71
72 ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
73 if (ret) {
74 dev_err(dev, "failed to init phy\n");
75 return ret;
76 }
77 pm_runtime_enable(dev);
78 ret = pm_runtime_get_sync(dev);
79 if (ret < 0) {
80 dev_err(dev, "pm_runtime_get_sync() failed\n");
81 goto err_get_sync;
82 }
83
84 ret = cdns_pcie_host_setup(rc);
85 if (ret)
86 goto err_init;
87 } else {
88 if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
89 return -ENODEV;
90
91 ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
92 if (!ep)
93 return -ENOMEM;
94
95 ep->pcie.dev = dev;
96 cdns_plat_pcie->pcie = &ep->pcie;
97 cdns_plat_pcie->is_rc = is_rc;
98
99 ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
100 if (ret) {
101 dev_err(dev, "failed to init phy\n");
102 return ret;
103 }
104
105 pm_runtime_enable(dev);
106 ret = pm_runtime_get_sync(dev);
107 if (ret < 0) {
108 dev_err(dev, "pm_runtime_get_sync() failed\n");
109 goto err_get_sync;
110 }
111
112 ret = cdns_pcie_ep_setup(ep);
113 if (ret)
114 goto err_init;
115 }
116
117 err_init:
118 pm_runtime_put_sync(dev);
119
120 err_get_sync:
121 pm_runtime_disable(dev);
122 cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
123 phy_count = cdns_plat_pcie->pcie->phy_count;
124 while (phy_count--)
125 device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
126
127 return 0;
128}
129
130static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
131{
132 struct device *dev = &pdev->dev;
133 struct cdns_pcie *pcie = dev_get_drvdata(dev);
134 int ret;
135
136 ret = pm_runtime_put_sync(dev);
137 if (ret < 0)
138 dev_dbg(dev, "pm_runtime_put_sync failed\n");
139
140 pm_runtime_disable(dev);
141
142 cdns_pcie_disable_phy(pcie);
143}
144
145static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
146 .is_rc = true,
147};
148
149static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
150 .is_rc = false,
151};
152
153static const struct of_device_id cdns_plat_pcie_of_match[] = {
154 {
155 .compatible = "cdns,cdns-pcie-host",
156 .data = &cdns_plat_pcie_host_of_data,
157 },
158 {
159 .compatible = "cdns,cdns-pcie-ep",
160 .data = &cdns_plat_pcie_ep_of_data,
161 },
162 {},
163};
164
165static struct platform_driver cdns_plat_pcie_driver = {
166 .driver = {
167 .name = "cdns-pcie",
168 .of_match_table = cdns_plat_pcie_of_match,
169 .pm = &cdns_pcie_pm_ops,
170 },
171 .probe = cdns_plat_pcie_probe,
172 .shutdown = cdns_plat_pcie_shutdown,
173};
174builtin_platform_driver(cdns_plat_pcie_driver);