drivers/pci/controller/cadence/pcie-cadence-plat.c

   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  */
  22 struct cdns_plat_pcie {
  23         struct cdns_pcie        *pcie;
  24         bool is_rc;
  25 };
  26
  27 struct cdns_plat_pcie_of_data {
  28         bool is_rc;
  29 };
  30
  31 static const struct of_device_id cdns_plat_pcie_of_match[];
  32
  33 static 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
 130 static 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
 145 static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
 146         .is_rc = true,
 147 };
 148
 149 static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
 150         .is_rc = false,
 151 };
 152
 153 static 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
 165 static 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 };
 174 builtin_platform_driver(cdns_plat_pcie_driver);