1de80f95cSTom Joseph // SPDX-License-Identifier: GPL-2.0
2de80f95cSTom Joseph /*
3de80f95cSTom Joseph * Cadence PCIe platform driver.
4de80f95cSTom Joseph *
5de80f95cSTom Joseph * Copyright (c) 2019, Cadence Design Systems
6de80f95cSTom Joseph * Author: Tom Joseph <tjoseph@cadence.com>
7de80f95cSTom Joseph */
8de80f95cSTom Joseph #include <linux/kernel.h>
9*c925cfafSRob Herring #include <linux/of.h>
10de80f95cSTom Joseph #include <linux/of_pci.h>
11de80f95cSTom Joseph #include <linux/platform_device.h>
12de80f95cSTom Joseph #include <linux/pm_runtime.h>
13de80f95cSTom Joseph #include "pcie-cadence.h"
14de80f95cSTom Joseph
15d07701a1SKishon Vijay Abraham I #define CDNS_PLAT_CPU_TO_BUS_ADDR 0x0FFFFFFF
16d07701a1SKishon Vijay Abraham I
17de80f95cSTom Joseph /**
18de80f95cSTom Joseph * struct cdns_plat_pcie - private data for this PCIe platform driver
19de80f95cSTom Joseph * @pcie: Cadence PCIe controller
20de80f95cSTom Joseph */
21de80f95cSTom Joseph struct cdns_plat_pcie {
22de80f95cSTom Joseph struct cdns_pcie *pcie;
23de80f95cSTom Joseph };
24de80f95cSTom Joseph
25de80f95cSTom Joseph struct cdns_plat_pcie_of_data {
26de80f95cSTom Joseph bool is_rc;
27de80f95cSTom Joseph };
28de80f95cSTom Joseph
29de80f95cSTom Joseph static const struct of_device_id cdns_plat_pcie_of_match[];
30de80f95cSTom Joseph
cdns_plat_cpu_addr_fixup(struct cdns_pcie * pcie,u64 cpu_addr)31d07701a1SKishon Vijay Abraham I static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
32d07701a1SKishon Vijay Abraham I {
33d07701a1SKishon Vijay Abraham I return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
34d07701a1SKishon Vijay Abraham I }
35d07701a1SKishon Vijay Abraham I
36d07701a1SKishon Vijay Abraham I static const struct cdns_pcie_ops cdns_plat_ops = {
37d07701a1SKishon Vijay Abraham I .cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
38d07701a1SKishon Vijay Abraham I };
39d07701a1SKishon Vijay Abraham I
cdns_plat_pcie_probe(struct platform_device * pdev)40de80f95cSTom Joseph static int cdns_plat_pcie_probe(struct platform_device *pdev)
41de80f95cSTom Joseph {
42de80f95cSTom Joseph const struct cdns_plat_pcie_of_data *data;
43de80f95cSTom Joseph struct cdns_plat_pcie *cdns_plat_pcie;
44de80f95cSTom Joseph struct device *dev = &pdev->dev;
45de80f95cSTom Joseph struct pci_host_bridge *bridge;
46de80f95cSTom Joseph struct cdns_pcie_ep *ep;
47de80f95cSTom Joseph struct cdns_pcie_rc *rc;
48de80f95cSTom Joseph int phy_count;
49de80f95cSTom Joseph bool is_rc;
50de80f95cSTom Joseph int ret;
51de80f95cSTom Joseph
52131748adSFan Fei data = of_device_get_match_data(dev);
53131748adSFan Fei if (!data)
54de80f95cSTom Joseph return -EINVAL;
55de80f95cSTom Joseph
56de80f95cSTom Joseph is_rc = data->is_rc;
57de80f95cSTom Joseph
58de80f95cSTom Joseph pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
59de80f95cSTom Joseph cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
60de80f95cSTom Joseph if (!cdns_plat_pcie)
61de80f95cSTom Joseph return -ENOMEM;
62de80f95cSTom Joseph
63de80f95cSTom Joseph platform_set_drvdata(pdev, cdns_plat_pcie);
64de80f95cSTom Joseph if (is_rc) {
65de80f95cSTom Joseph if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
66de80f95cSTom Joseph return -ENODEV;
67de80f95cSTom Joseph
68de80f95cSTom Joseph bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
69de80f95cSTom Joseph if (!bridge)
70de80f95cSTom Joseph return -ENOMEM;
71de80f95cSTom Joseph
72de80f95cSTom Joseph rc = pci_host_bridge_priv(bridge);
73de80f95cSTom Joseph rc->pcie.dev = dev;
74d07701a1SKishon Vijay Abraham I rc->pcie.ops = &cdns_plat_ops;
75de80f95cSTom Joseph cdns_plat_pcie->pcie = &rc->pcie;
76de80f95cSTom Joseph
77de80f95cSTom Joseph ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
78de80f95cSTom Joseph if (ret) {
79de80f95cSTom Joseph dev_err(dev, "failed to init phy\n");
80de80f95cSTom Joseph return ret;
81de80f95cSTom Joseph }
82de80f95cSTom Joseph pm_runtime_enable(dev);
83de80f95cSTom Joseph ret = pm_runtime_get_sync(dev);
84de80f95cSTom Joseph if (ret < 0) {
85de80f95cSTom Joseph dev_err(dev, "pm_runtime_get_sync() failed\n");
86de80f95cSTom Joseph goto err_get_sync;
87de80f95cSTom Joseph }
88de80f95cSTom Joseph
89de80f95cSTom Joseph ret = cdns_pcie_host_setup(rc);
90de80f95cSTom Joseph if (ret)
91de80f95cSTom Joseph goto err_init;
92de80f95cSTom Joseph } else {
93de80f95cSTom Joseph if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
94de80f95cSTom Joseph return -ENODEV;
95de80f95cSTom Joseph
96de80f95cSTom Joseph ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
97de80f95cSTom Joseph if (!ep)
98de80f95cSTom Joseph return -ENOMEM;
99de80f95cSTom Joseph
100de80f95cSTom Joseph ep->pcie.dev = dev;
101d07701a1SKishon Vijay Abraham I ep->pcie.ops = &cdns_plat_ops;
102de80f95cSTom Joseph cdns_plat_pcie->pcie = &ep->pcie;
103de80f95cSTom Joseph
104de80f95cSTom Joseph ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
105de80f95cSTom Joseph if (ret) {
106de80f95cSTom Joseph dev_err(dev, "failed to init phy\n");
107de80f95cSTom Joseph return ret;
108de80f95cSTom Joseph }
109de80f95cSTom Joseph
110de80f95cSTom Joseph pm_runtime_enable(dev);
111de80f95cSTom Joseph ret = pm_runtime_get_sync(dev);
112de80f95cSTom Joseph if (ret < 0) {
113de80f95cSTom Joseph dev_err(dev, "pm_runtime_get_sync() failed\n");
114de80f95cSTom Joseph goto err_get_sync;
115de80f95cSTom Joseph }
116de80f95cSTom Joseph
117de80f95cSTom Joseph ret = cdns_pcie_ep_setup(ep);
118de80f95cSTom Joseph if (ret)
119de80f95cSTom Joseph goto err_init;
120de80f95cSTom Joseph }
121de80f95cSTom Joseph
12227cd7e3cSLi Chen return 0;
12327cd7e3cSLi Chen
124de80f95cSTom Joseph err_init:
125de80f95cSTom Joseph err_get_sync:
1267a790087SDinghao Liu pm_runtime_put_sync(dev);
127de80f95cSTom Joseph pm_runtime_disable(dev);
128de80f95cSTom Joseph cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
129de80f95cSTom Joseph phy_count = cdns_plat_pcie->pcie->phy_count;
130de80f95cSTom Joseph while (phy_count--)
131de80f95cSTom Joseph device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
132de80f95cSTom Joseph
133de80f95cSTom Joseph return 0;
134de80f95cSTom Joseph }
135de80f95cSTom Joseph
cdns_plat_pcie_shutdown(struct platform_device * pdev)136de80f95cSTom Joseph static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
137de80f95cSTom Joseph {
138de80f95cSTom Joseph struct device *dev = &pdev->dev;
139de80f95cSTom Joseph struct cdns_pcie *pcie = dev_get_drvdata(dev);
140de80f95cSTom Joseph int ret;
141de80f95cSTom Joseph
142de80f95cSTom Joseph ret = pm_runtime_put_sync(dev);
143de80f95cSTom Joseph if (ret < 0)
144de80f95cSTom Joseph dev_dbg(dev, "pm_runtime_put_sync failed\n");
145de80f95cSTom Joseph
146de80f95cSTom Joseph pm_runtime_disable(dev);
147de80f95cSTom Joseph
148de80f95cSTom Joseph cdns_pcie_disable_phy(pcie);
149de80f95cSTom Joseph }
150de80f95cSTom Joseph
151de80f95cSTom Joseph static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
152de80f95cSTom Joseph .is_rc = true,
153de80f95cSTom Joseph };
154de80f95cSTom Joseph
155de80f95cSTom Joseph static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
156de80f95cSTom Joseph .is_rc = false,
157de80f95cSTom Joseph };
158de80f95cSTom Joseph
159de80f95cSTom Joseph static const struct of_device_id cdns_plat_pcie_of_match[] = {
160de80f95cSTom Joseph {
161de80f95cSTom Joseph .compatible = "cdns,cdns-pcie-host",
162de80f95cSTom Joseph .data = &cdns_plat_pcie_host_of_data,
163de80f95cSTom Joseph },
164de80f95cSTom Joseph {
165de80f95cSTom Joseph .compatible = "cdns,cdns-pcie-ep",
166de80f95cSTom Joseph .data = &cdns_plat_pcie_ep_of_data,
167de80f95cSTom Joseph },
168de80f95cSTom Joseph {},
169de80f95cSTom Joseph };
170de80f95cSTom Joseph
171de80f95cSTom Joseph static struct platform_driver cdns_plat_pcie_driver = {
172de80f95cSTom Joseph .driver = {
173de80f95cSTom Joseph .name = "cdns-pcie",
174de80f95cSTom Joseph .of_match_table = cdns_plat_pcie_of_match,
175de80f95cSTom Joseph .pm = &cdns_pcie_pm_ops,
176de80f95cSTom Joseph },
177de80f95cSTom Joseph .probe = cdns_plat_pcie_probe,
178de80f95cSTom Joseph .shutdown = cdns_plat_pcie_shutdown,
179de80f95cSTom Joseph };
180de80f95cSTom Joseph builtin_platform_driver(cdns_plat_pcie_driver);
181