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.h>
  10 #include <linux/of_pci.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_runtime.h>
  13 #include "pcie-cadence.h"
  14
  15 #define CDNS_PLAT_CPU_TO_BUS_ADDR       0x0FFFFFFF
  16
  17 /**
  18  * struct cdns_plat_pcie - private data for this PCIe platform driver
  19  * @pcie: Cadence PCIe controller
  20  */
  21 struct cdns_plat_pcie {
  22         struct cdns_pcie        *pcie;
  23 };
  24
  25 struct cdns_plat_pcie_of_data {
  26         bool is_rc;
  27 };
  28
  29 static const struct of_device_id cdns_plat_pcie_of_match[];
  30
  31 static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
  32 {
  33         return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
  34 }
  35
  36 static const struct cdns_pcie_ops cdns_plat_ops = {
  37         .cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
  38 };
  39
  40 static int cdns_plat_pcie_probe(struct platform_device *pdev)
  41 {
  42         const struct cdns_plat_pcie_of_data *data;
  43         struct cdns_plat_pcie *cdns_plat_pcie;
  44         struct device *dev = &pdev->dev;
  45         struct pci_host_bridge *bridge;
  46         struct cdns_pcie_ep *ep;
  47         struct cdns_pcie_rc *rc;
  48         int phy_count;
  49         bool is_rc;
  50         int ret;
  51
  52         data = of_device_get_match_data(dev);
  53         if (!data)
  54                 return -EINVAL;
  55
  56         is_rc = data->is_rc;
  57
  58         pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
  59         cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
  60         if (!cdns_plat_pcie)
  61                 return -ENOMEM;
  62
  63         platform_set_drvdata(pdev, cdns_plat_pcie);
  64         if (is_rc) {
  65                 if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
  66                         return -ENODEV;
  67
  68                 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
  69                 if (!bridge)
  70                         return -ENOMEM;
  71
  72                 rc = pci_host_bridge_priv(bridge);
  73                 rc->pcie.dev = dev;
  74                 rc->pcie.ops = &cdns_plat_ops;
  75                 cdns_plat_pcie->pcie = &rc->pcie;
  76
  77                 ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
  78                 if (ret) {
  79                         dev_err(dev, "failed to init phy\n");
  80                         return ret;
  81                 }
  82                 pm_runtime_enable(dev);
  83                 ret = pm_runtime_get_sync(dev);
  84                 if (ret < 0) {
  85                         dev_err(dev, "pm_runtime_get_sync() failed\n");
  86                         goto err_get_sync;
  87                 }
  88
  89                 ret = cdns_pcie_host_setup(rc);
  90                 if (ret)
  91                         goto err_init;
  92         } else {
  93                 if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
  94                         return -ENODEV;
  95
  96                 ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
  97                 if (!ep)
  98                         return -ENOMEM;
  99
 100                 ep->pcie.dev = dev;
 101                 ep->pcie.ops = &cdns_plat_ops;
 102                 cdns_plat_pcie->pcie = &ep->pcie;
 103
 104                 ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
 105                 if (ret) {
 106                         dev_err(dev, "failed to init phy\n");
 107                         return ret;
 108                 }
 109
 110                 pm_runtime_enable(dev);
 111                 ret = pm_runtime_get_sync(dev);
 112                 if (ret < 0) {
 113                         dev_err(dev, "pm_runtime_get_sync() failed\n");
 114                         goto err_get_sync;
 115                 }
 116
 117                 ret = cdns_pcie_ep_setup(ep);
 118                 if (ret)
 119                         goto err_init;
 120         }
 121
 122         return 0;
 123
 124  err_init:
 125  err_get_sync:
 126         pm_runtime_put_sync(dev);
 127         pm_runtime_disable(dev);
 128         cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
 129         phy_count = cdns_plat_pcie->pcie->phy_count;
 130         while (phy_count--)
 131                 device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
 132
 133         return 0;
 134 }
 135
 136 static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
 137 {
 138         struct device *dev = &pdev->dev;
 139         struct cdns_pcie *pcie = dev_get_drvdata(dev);
 140         int ret;
 141
 142         ret = pm_runtime_put_sync(dev);
 143         if (ret < 0)
 144                 dev_dbg(dev, "pm_runtime_put_sync failed\n");
 145
 146         pm_runtime_disable(dev);
 147
 148         cdns_pcie_disable_phy(pcie);
 149 }
 150
 151 static const struct cdns_plat_pcie_of_data cdns_plat_pcie_host_of_data = {
 152         .is_rc = true,
 153 };
 154
 155 static const struct cdns_plat_pcie_of_data cdns_plat_pcie_ep_of_data = {
 156         .is_rc = false,
 157 };
 158
 159 static const struct of_device_id cdns_plat_pcie_of_match[] = {
 160         {
 161                 .compatible = "cdns,cdns-pcie-host",
 162                 .data = &cdns_plat_pcie_host_of_data,
 163         },
 164         {
 165                 .compatible = "cdns,cdns-pcie-ep",
 166                 .data = &cdns_plat_pcie_ep_of_data,
 167         },
 168         {},
 169 };
 170
 171 static struct platform_driver cdns_plat_pcie_driver = {
 172         .driver = {
 173                 .name = "cdns-pcie",
 174                 .of_match_table = cdns_plat_pcie_of_match,
 175                 .pm     = &cdns_pcie_pm_ops,
 176         },
 177         .probe = cdns_plat_pcie_probe,
 178         .shutdown = cdns_plat_pcie_shutdown,
 179 };
 180 builtin_platform_driver(cdns_plat_pcie_driver);