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> 9de80f95cSTom Joseph #include <linux/of_address.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 <linux/of_device.h> 14de80f95cSTom Joseph #include "pcie-cadence.h" 15de80f95cSTom Joseph 16d07701a1SKishon Vijay Abraham I #define CDNS_PLAT_CPU_TO_BUS_ADDR 0x0FFFFFFF 17d07701a1SKishon Vijay Abraham I 18de80f95cSTom Joseph /** 19de80f95cSTom Joseph * struct cdns_plat_pcie - private data for this PCIe platform driver 20de80f95cSTom Joseph * @pcie: Cadence PCIe controller 21de80f95cSTom Joseph * @is_rc: Set to 1 indicates the PCIe controller mode is Root Complex, 22de80f95cSTom Joseph * if 0 it is in Endpoint mode. 23de80f95cSTom Joseph */ 24de80f95cSTom Joseph struct cdns_plat_pcie { 25de80f95cSTom Joseph struct cdns_pcie *pcie; 26de80f95cSTom Joseph bool is_rc; 27de80f95cSTom Joseph }; 28de80f95cSTom Joseph 29de80f95cSTom Joseph struct cdns_plat_pcie_of_data { 30de80f95cSTom Joseph bool is_rc; 31de80f95cSTom Joseph }; 32de80f95cSTom Joseph 33de80f95cSTom Joseph static const struct of_device_id cdns_plat_pcie_of_match[]; 34de80f95cSTom Joseph 35d07701a1SKishon Vijay Abraham I static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr) 36d07701a1SKishon Vijay Abraham I { 37d07701a1SKishon Vijay Abraham I return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR; 38d07701a1SKishon Vijay Abraham I } 39d07701a1SKishon Vijay Abraham I 40d07701a1SKishon Vijay Abraham I static const struct cdns_pcie_ops cdns_plat_ops = { 41d07701a1SKishon Vijay Abraham I .cpu_addr_fixup = cdns_plat_cpu_addr_fixup, 42d07701a1SKishon Vijay Abraham I }; 43d07701a1SKishon Vijay Abraham I 44de80f95cSTom Joseph static int cdns_plat_pcie_probe(struct platform_device *pdev) 45de80f95cSTom Joseph { 46de80f95cSTom Joseph const struct cdns_plat_pcie_of_data *data; 47de80f95cSTom Joseph struct cdns_plat_pcie *cdns_plat_pcie; 48de80f95cSTom Joseph struct device *dev = &pdev->dev; 49de80f95cSTom Joseph struct pci_host_bridge *bridge; 50de80f95cSTom Joseph struct cdns_pcie_ep *ep; 51de80f95cSTom Joseph struct cdns_pcie_rc *rc; 52de80f95cSTom Joseph int phy_count; 53de80f95cSTom Joseph bool is_rc; 54de80f95cSTom Joseph int ret; 55de80f95cSTom Joseph 56*131748adSFan Fei data = of_device_get_match_data(dev); 57*131748adSFan Fei if (!data) 58de80f95cSTom Joseph return -EINVAL; 59de80f95cSTom Joseph 60de80f95cSTom Joseph is_rc = data->is_rc; 61de80f95cSTom Joseph 62de80f95cSTom Joseph pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc); 63de80f95cSTom Joseph cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL); 64de80f95cSTom Joseph if (!cdns_plat_pcie) 65de80f95cSTom Joseph return -ENOMEM; 66de80f95cSTom Joseph 67de80f95cSTom Joseph platform_set_drvdata(pdev, cdns_plat_pcie); 68de80f95cSTom Joseph if (is_rc) { 69de80f95cSTom Joseph if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST)) 70de80f95cSTom Joseph return -ENODEV; 71de80f95cSTom Joseph 72de80f95cSTom Joseph bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc)); 73de80f95cSTom Joseph if (!bridge) 74de80f95cSTom Joseph return -ENOMEM; 75de80f95cSTom Joseph 76de80f95cSTom Joseph rc = pci_host_bridge_priv(bridge); 77de80f95cSTom Joseph rc->pcie.dev = dev; 78d07701a1SKishon Vijay Abraham I rc->pcie.ops = &cdns_plat_ops; 79de80f95cSTom Joseph cdns_plat_pcie->pcie = &rc->pcie; 80de80f95cSTom Joseph cdns_plat_pcie->is_rc = is_rc; 81de80f95cSTom Joseph 82de80f95cSTom Joseph ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie); 83de80f95cSTom Joseph if (ret) { 84de80f95cSTom Joseph dev_err(dev, "failed to init phy\n"); 85de80f95cSTom Joseph return ret; 86de80f95cSTom Joseph } 87de80f95cSTom Joseph pm_runtime_enable(dev); 88de80f95cSTom Joseph ret = pm_runtime_get_sync(dev); 89de80f95cSTom Joseph if (ret < 0) { 90de80f95cSTom Joseph dev_err(dev, "pm_runtime_get_sync() failed\n"); 91de80f95cSTom Joseph goto err_get_sync; 92de80f95cSTom Joseph } 93de80f95cSTom Joseph 94de80f95cSTom Joseph ret = cdns_pcie_host_setup(rc); 95de80f95cSTom Joseph if (ret) 96de80f95cSTom Joseph goto err_init; 97de80f95cSTom Joseph } else { 98de80f95cSTom Joseph if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP)) 99de80f95cSTom Joseph return -ENODEV; 100de80f95cSTom Joseph 101de80f95cSTom Joseph ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL); 102de80f95cSTom Joseph if (!ep) 103de80f95cSTom Joseph return -ENOMEM; 104de80f95cSTom Joseph 105de80f95cSTom Joseph ep->pcie.dev = dev; 106d07701a1SKishon Vijay Abraham I ep->pcie.ops = &cdns_plat_ops; 107de80f95cSTom Joseph cdns_plat_pcie->pcie = &ep->pcie; 108de80f95cSTom Joseph cdns_plat_pcie->is_rc = is_rc; 109de80f95cSTom Joseph 110de80f95cSTom Joseph ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie); 111de80f95cSTom Joseph if (ret) { 112de80f95cSTom Joseph dev_err(dev, "failed to init phy\n"); 113de80f95cSTom Joseph return ret; 114de80f95cSTom Joseph } 115de80f95cSTom Joseph 116de80f95cSTom Joseph pm_runtime_enable(dev); 117de80f95cSTom Joseph ret = pm_runtime_get_sync(dev); 118de80f95cSTom Joseph if (ret < 0) { 119de80f95cSTom Joseph dev_err(dev, "pm_runtime_get_sync() failed\n"); 120de80f95cSTom Joseph goto err_get_sync; 121de80f95cSTom Joseph } 122de80f95cSTom Joseph 123de80f95cSTom Joseph ret = cdns_pcie_ep_setup(ep); 124de80f95cSTom Joseph if (ret) 125de80f95cSTom Joseph goto err_init; 126de80f95cSTom Joseph } 127de80f95cSTom Joseph 12827cd7e3cSLi Chen return 0; 12927cd7e3cSLi Chen 130de80f95cSTom Joseph err_init: 131de80f95cSTom Joseph err_get_sync: 1327a790087SDinghao Liu pm_runtime_put_sync(dev); 133de80f95cSTom Joseph pm_runtime_disable(dev); 134de80f95cSTom Joseph cdns_pcie_disable_phy(cdns_plat_pcie->pcie); 135de80f95cSTom Joseph phy_count = cdns_plat_pcie->pcie->phy_count; 136de80f95cSTom Joseph while (phy_count--) 137de80f95cSTom Joseph device_link_del(cdns_plat_pcie->pcie->link[phy_count]); 138de80f95cSTom Joseph 139de80f95cSTom Joseph return 0; 140de80f95cSTom Joseph } 141de80f95cSTom Joseph 142de80f95cSTom Joseph static void cdns_plat_pcie_shutdown(struct platform_device *pdev) 143de80f95cSTom Joseph { 144de80f95cSTom Joseph struct device *dev = &pdev->dev; 145de80f95cSTom Joseph struct cdns_pcie *pcie = dev_get_drvdata(dev); 146de80f95cSTom Joseph int ret; 147de80f95cSTom Joseph 148de80f95cSTom Joseph ret = pm_runtime_put_sync(dev); 149de80f95cSTom Joseph if (ret < 0) 150de80f95cSTom Joseph dev_dbg(dev, "pm_runtime_put_sync failed\n"); 151de80f95cSTom Joseph 152de80f95cSTom Joseph pm_runtime_disable(dev); 153de80f95cSTom Joseph 154de80f95cSTom Joseph cdns_pcie_disable_phy(pcie); 155de80f95cSTom Joseph } 156de80f95cSTom Joseph 157de80f95cSTom Joseph static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = { 158de80f95cSTom Joseph .is_rc = true, 159de80f95cSTom Joseph }; 160de80f95cSTom Joseph 161de80f95cSTom Joseph static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = { 162de80f95cSTom Joseph .is_rc = false, 163de80f95cSTom Joseph }; 164de80f95cSTom Joseph 165de80f95cSTom Joseph static const struct of_device_id cdns_plat_pcie_of_match[] = { 166de80f95cSTom Joseph { 167de80f95cSTom Joseph .compatible = "cdns,cdns-pcie-host", 168de80f95cSTom Joseph .data = &cdns_plat_pcie_host_of_data, 169de80f95cSTom Joseph }, 170de80f95cSTom Joseph { 171de80f95cSTom Joseph .compatible = "cdns,cdns-pcie-ep", 172de80f95cSTom Joseph .data = &cdns_plat_pcie_ep_of_data, 173de80f95cSTom Joseph }, 174de80f95cSTom Joseph {}, 175de80f95cSTom Joseph }; 176de80f95cSTom Joseph 177de80f95cSTom Joseph static struct platform_driver cdns_plat_pcie_driver = { 178de80f95cSTom Joseph .driver = { 179de80f95cSTom Joseph .name = "cdns-pcie", 180de80f95cSTom Joseph .of_match_table = cdns_plat_pcie_of_match, 181de80f95cSTom Joseph .pm = &cdns_pcie_pm_ops, 182de80f95cSTom Joseph }, 183de80f95cSTom Joseph .probe = cdns_plat_pcie_probe, 184de80f95cSTom Joseph .shutdown = cdns_plat_pcie_shutdown, 185de80f95cSTom Joseph }; 186de80f95cSTom Joseph builtin_platform_driver(cdns_plat_pcie_driver); 187