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 * @is_rc: Set to 1 indicates the PCIe controller mode is Root Complex,
21de80f95cSTom Joseph * if 0 it is in Endpoint mode.
22de80f95cSTom Joseph */
23de80f95cSTom Joseph struct cdns_plat_pcie {
24de80f95cSTom Joseph struct cdns_pcie *pcie;
25de80f95cSTom Joseph bool is_rc;
26de80f95cSTom Joseph };
27de80f95cSTom Joseph
28de80f95cSTom Joseph struct cdns_plat_pcie_of_data {
29de80f95cSTom Joseph bool is_rc;
30de80f95cSTom Joseph };
31de80f95cSTom Joseph
32de80f95cSTom Joseph static const struct of_device_id cdns_plat_pcie_of_match[];
33de80f95cSTom Joseph
cdns_plat_cpu_addr_fixup(struct cdns_pcie * pcie,u64 cpu_addr)34d07701a1SKishon Vijay Abraham I static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
35d07701a1SKishon Vijay Abraham I {
36d07701a1SKishon Vijay Abraham I return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
37d07701a1SKishon Vijay Abraham I }
38d07701a1SKishon Vijay Abraham I
39d07701a1SKishon Vijay Abraham I static const struct cdns_pcie_ops cdns_plat_ops = {
40d07701a1SKishon Vijay Abraham I .cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
41d07701a1SKishon Vijay Abraham I };
42d07701a1SKishon Vijay Abraham I
cdns_plat_pcie_probe(struct platform_device * pdev)43de80f95cSTom Joseph static int cdns_plat_pcie_probe(struct platform_device *pdev)
44de80f95cSTom Joseph {
45de80f95cSTom Joseph const struct cdns_plat_pcie_of_data *data;
46de80f95cSTom Joseph struct cdns_plat_pcie *cdns_plat_pcie;
47de80f95cSTom Joseph struct device *dev = &pdev->dev;
48de80f95cSTom Joseph struct pci_host_bridge *bridge;
49de80f95cSTom Joseph struct cdns_pcie_ep *ep;
50de80f95cSTom Joseph struct cdns_pcie_rc *rc;
51de80f95cSTom Joseph int phy_count;
52de80f95cSTom Joseph bool is_rc;
53de80f95cSTom Joseph int ret;
54de80f95cSTom Joseph
55131748adSFan Fei data = of_device_get_match_data(dev);
56131748adSFan Fei if (!data)
57de80f95cSTom Joseph return -EINVAL;
58de80f95cSTom Joseph
59de80f95cSTom Joseph is_rc = data->is_rc;
60de80f95cSTom Joseph
61de80f95cSTom Joseph pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
62de80f95cSTom Joseph cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
63de80f95cSTom Joseph if (!cdns_plat_pcie)
64de80f95cSTom Joseph return -ENOMEM;
65de80f95cSTom Joseph
66de80f95cSTom Joseph platform_set_drvdata(pdev, cdns_plat_pcie);
67de80f95cSTom Joseph if (is_rc) {
68de80f95cSTom Joseph if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
69de80f95cSTom Joseph return -ENODEV;
70de80f95cSTom Joseph
71de80f95cSTom Joseph bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
72de80f95cSTom Joseph if (!bridge)
73de80f95cSTom Joseph return -ENOMEM;
74de80f95cSTom Joseph
75de80f95cSTom Joseph rc = pci_host_bridge_priv(bridge);
76de80f95cSTom Joseph rc->pcie.dev = dev;
77d07701a1SKishon Vijay Abraham I rc->pcie.ops = &cdns_plat_ops;
78de80f95cSTom Joseph cdns_plat_pcie->pcie = &rc->pcie;
79de80f95cSTom Joseph cdns_plat_pcie->is_rc = is_rc;
80de80f95cSTom Joseph
81de80f95cSTom Joseph ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
82de80f95cSTom Joseph if (ret) {
83de80f95cSTom Joseph dev_err(dev, "failed to init phy\n");
84de80f95cSTom Joseph return ret;
85de80f95cSTom Joseph }
86de80f95cSTom Joseph pm_runtime_enable(dev);
87de80f95cSTom Joseph ret = pm_runtime_get_sync(dev);
88de80f95cSTom Joseph if (ret < 0) {
89de80f95cSTom Joseph dev_err(dev, "pm_runtime_get_sync() failed\n");
90de80f95cSTom Joseph goto err_get_sync;
91de80f95cSTom Joseph }
92de80f95cSTom Joseph
93de80f95cSTom Joseph ret = cdns_pcie_host_setup(rc);
94de80f95cSTom Joseph if (ret)
95de80f95cSTom Joseph goto err_init;
96de80f95cSTom Joseph } else {
97de80f95cSTom Joseph if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
98de80f95cSTom Joseph return -ENODEV;
99de80f95cSTom Joseph
100de80f95cSTom Joseph ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
101de80f95cSTom Joseph if (!ep)
102de80f95cSTom Joseph return -ENOMEM;
103de80f95cSTom Joseph
104de80f95cSTom Joseph ep->pcie.dev = dev;
105d07701a1SKishon Vijay Abraham I ep->pcie.ops = &cdns_plat_ops;
106de80f95cSTom Joseph cdns_plat_pcie->pcie = &ep->pcie;
107de80f95cSTom Joseph cdns_plat_pcie->is_rc = is_rc;
108de80f95cSTom Joseph
109de80f95cSTom Joseph ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
110de80f95cSTom Joseph if (ret) {
111de80f95cSTom Joseph dev_err(dev, "failed to init phy\n");
112de80f95cSTom Joseph return ret;
113de80f95cSTom Joseph }
114de80f95cSTom Joseph
115de80f95cSTom Joseph pm_runtime_enable(dev);
116de80f95cSTom Joseph ret = pm_runtime_get_sync(dev);
117de80f95cSTom Joseph if (ret < 0) {
118de80f95cSTom Joseph dev_err(dev, "pm_runtime_get_sync() failed\n");
119de80f95cSTom Joseph goto err_get_sync;
120de80f95cSTom Joseph }
121de80f95cSTom Joseph
122de80f95cSTom Joseph ret = cdns_pcie_ep_setup(ep);
123de80f95cSTom Joseph if (ret)
124de80f95cSTom Joseph goto err_init;
125de80f95cSTom Joseph }
126de80f95cSTom Joseph
12727cd7e3cSLi Chen return 0;
12827cd7e3cSLi Chen
129de80f95cSTom Joseph err_init:
130de80f95cSTom Joseph err_get_sync:
1317a790087SDinghao Liu pm_runtime_put_sync(dev);
132de80f95cSTom Joseph pm_runtime_disable(dev);
133de80f95cSTom Joseph cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
134de80f95cSTom Joseph phy_count = cdns_plat_pcie->pcie->phy_count;
135de80f95cSTom Joseph while (phy_count--)
136de80f95cSTom Joseph device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
137de80f95cSTom Joseph
138de80f95cSTom Joseph return 0;
139de80f95cSTom Joseph }
140de80f95cSTom Joseph
cdns_plat_pcie_shutdown(struct platform_device * pdev)141de80f95cSTom Joseph static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
142de80f95cSTom Joseph {
143de80f95cSTom Joseph struct device *dev = &pdev->dev;
144de80f95cSTom Joseph struct cdns_pcie *pcie = dev_get_drvdata(dev);
145de80f95cSTom Joseph int ret;
146de80f95cSTom Joseph
147de80f95cSTom Joseph ret = pm_runtime_put_sync(dev);
148de80f95cSTom Joseph if (ret < 0)
149de80f95cSTom Joseph dev_dbg(dev, "pm_runtime_put_sync failed\n");
150de80f95cSTom Joseph
151de80f95cSTom Joseph pm_runtime_disable(dev);
152de80f95cSTom Joseph
153de80f95cSTom Joseph cdns_pcie_disable_phy(pcie);
154de80f95cSTom Joseph }
155de80f95cSTom Joseph
156de80f95cSTom Joseph static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
157de80f95cSTom Joseph .is_rc = true,
158de80f95cSTom Joseph };
159de80f95cSTom Joseph
160de80f95cSTom Joseph static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
161de80f95cSTom Joseph .is_rc = false,
162de80f95cSTom Joseph };
163de80f95cSTom Joseph
164de80f95cSTom Joseph static const struct of_device_id cdns_plat_pcie_of_match[] = {
165de80f95cSTom Joseph {
166de80f95cSTom Joseph .compatible = "cdns,cdns-pcie-host",
167de80f95cSTom Joseph .data = &cdns_plat_pcie_host_of_data,
168de80f95cSTom Joseph },
169de80f95cSTom Joseph {
170de80f95cSTom Joseph .compatible = "cdns,cdns-pcie-ep",
171de80f95cSTom Joseph .data = &cdns_plat_pcie_ep_of_data,
172de80f95cSTom Joseph },
173de80f95cSTom Joseph {},
174de80f95cSTom Joseph };
175de80f95cSTom Joseph
176de80f95cSTom Joseph static struct platform_driver cdns_plat_pcie_driver = {
177de80f95cSTom Joseph .driver = {
178de80f95cSTom Joseph .name = "cdns-pcie",
179de80f95cSTom Joseph .of_match_table = cdns_plat_pcie_of_match,
180de80f95cSTom Joseph .pm = &cdns_pcie_pm_ops,
181de80f95cSTom Joseph },
182de80f95cSTom Joseph .probe = cdns_plat_pcie_probe,
183de80f95cSTom Joseph .shutdown = cdns_plat_pcie_shutdown,
184de80f95cSTom Joseph };
185de80f95cSTom Joseph builtin_platform_driver(cdns_plat_pcie_driver);
186