1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * PCIe RC driver for Synopsys DesignWare Core 4 * 5 * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com) 6 * 7 * Authors: Joao Pinto <Joao.Pinto@synopsys.com> 8 */ 9 #include <linux/clk.h> 10 #include <linux/delay.h> 11 #include <linux/gpio.h> 12 #include <linux/interrupt.h> 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/of_device.h> 16 #include <linux/pci.h> 17 #include <linux/platform_device.h> 18 #include <linux/resource.h> 19 #include <linux/types.h> 20 #include <linux/regmap.h> 21 22 #include "pcie-designware.h" 23 24 struct dw_plat_pcie { 25 struct dw_pcie *pci; 26 struct regmap *regmap; 27 enum dw_pcie_device_mode mode; 28 }; 29 30 struct dw_plat_pcie_of_data { 31 enum dw_pcie_device_mode mode; 32 }; 33 34 static const struct of_device_id dw_plat_pcie_of_match[]; 35 36 static int dw_plat_pcie_host_init(struct pcie_port *pp) 37 { 38 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 39 40 dw_pcie_setup_rc(pp); 41 dw_pcie_wait_for_link(pci); 42 43 if (IS_ENABLED(CONFIG_PCI_MSI)) 44 dw_pcie_msi_init(pp); 45 46 return 0; 47 } 48 49 static void dw_plat_set_num_vectors(struct pcie_port *pp) 50 { 51 pp->num_vectors = MAX_MSI_IRQS; 52 } 53 54 static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = { 55 .host_init = dw_plat_pcie_host_init, 56 .set_num_vectors = dw_plat_set_num_vectors, 57 }; 58 59 static int dw_plat_pcie_establish_link(struct dw_pcie *pci) 60 { 61 return 0; 62 } 63 64 static const struct dw_pcie_ops dw_pcie_ops = { 65 .start_link = dw_plat_pcie_establish_link, 66 }; 67 68 static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep) 69 { 70 struct dw_pcie *pci = to_dw_pcie_from_ep(ep); 71 enum pci_barno bar; 72 73 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) 74 dw_pcie_ep_reset_bar(pci, bar); 75 } 76 77 static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, 78 enum pci_epc_irq_type type, 79 u16 interrupt_num) 80 { 81 struct dw_pcie *pci = to_dw_pcie_from_ep(ep); 82 83 switch (type) { 84 case PCI_EPC_IRQ_LEGACY: 85 return dw_pcie_ep_raise_legacy_irq(ep, func_no); 86 case PCI_EPC_IRQ_MSI: 87 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); 88 case PCI_EPC_IRQ_MSIX: 89 return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num); 90 default: 91 dev_err(pci->dev, "UNKNOWN IRQ type\n"); 92 } 93 94 return 0; 95 } 96 97 static const struct pci_epc_features dw_plat_pcie_epc_features = { 98 .linkup_notifier = false, 99 .msi_capable = true, 100 .msix_capable = true, 101 }; 102 103 static const struct pci_epc_features* 104 dw_plat_pcie_get_features(struct dw_pcie_ep *ep) 105 { 106 return &dw_plat_pcie_epc_features; 107 } 108 109 static const struct dw_pcie_ep_ops pcie_ep_ops = { 110 .ep_init = dw_plat_pcie_ep_init, 111 .raise_irq = dw_plat_pcie_ep_raise_irq, 112 .get_features = dw_plat_pcie_get_features, 113 }; 114 115 static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie, 116 struct platform_device *pdev) 117 { 118 struct dw_pcie *pci = dw_plat_pcie->pci; 119 struct pcie_port *pp = &pci->pp; 120 struct device *dev = &pdev->dev; 121 int ret; 122 123 pp->irq = platform_get_irq(pdev, 1); 124 if (pp->irq < 0) 125 return pp->irq; 126 127 if (IS_ENABLED(CONFIG_PCI_MSI)) { 128 pp->msi_irq = platform_get_irq(pdev, 0); 129 if (pp->msi_irq < 0) 130 return pp->msi_irq; 131 } 132 133 pp->ops = &dw_plat_pcie_host_ops; 134 135 ret = dw_pcie_host_init(pp); 136 if (ret) { 137 dev_err(dev, "Failed to initialize host\n"); 138 return ret; 139 } 140 141 return 0; 142 } 143 144 static int dw_plat_add_pcie_ep(struct dw_plat_pcie *dw_plat_pcie, 145 struct platform_device *pdev) 146 { 147 int ret; 148 struct dw_pcie_ep *ep; 149 struct resource *res; 150 struct device *dev = &pdev->dev; 151 struct dw_pcie *pci = dw_plat_pcie->pci; 152 153 ep = &pci->ep; 154 ep->ops = &pcie_ep_ops; 155 156 pci->dbi_base2 = devm_platform_ioremap_resource_byname(pdev, "dbi2"); 157 if (IS_ERR(pci->dbi_base2)) 158 return PTR_ERR(pci->dbi_base2); 159 160 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space"); 161 if (!res) 162 return -EINVAL; 163 164 ep->phys_base = res->start; 165 ep->addr_size = resource_size(res); 166 167 ret = dw_pcie_ep_init(ep); 168 if (ret) { 169 dev_err(dev, "Failed to initialize endpoint\n"); 170 return ret; 171 } 172 return 0; 173 } 174 175 static int dw_plat_pcie_probe(struct platform_device *pdev) 176 { 177 struct device *dev = &pdev->dev; 178 struct dw_plat_pcie *dw_plat_pcie; 179 struct dw_pcie *pci; 180 struct resource *res; /* Resource from DT */ 181 int ret; 182 const struct of_device_id *match; 183 const struct dw_plat_pcie_of_data *data; 184 enum dw_pcie_device_mode mode; 185 186 match = of_match_device(dw_plat_pcie_of_match, dev); 187 if (!match) 188 return -EINVAL; 189 190 data = (struct dw_plat_pcie_of_data *)match->data; 191 mode = (enum dw_pcie_device_mode)data->mode; 192 193 dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL); 194 if (!dw_plat_pcie) 195 return -ENOMEM; 196 197 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); 198 if (!pci) 199 return -ENOMEM; 200 201 pci->dev = dev; 202 pci->ops = &dw_pcie_ops; 203 204 dw_plat_pcie->pci = pci; 205 dw_plat_pcie->mode = mode; 206 207 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); 208 if (!res) 209 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 210 211 pci->dbi_base = devm_ioremap_resource(dev, res); 212 if (IS_ERR(pci->dbi_base)) 213 return PTR_ERR(pci->dbi_base); 214 215 platform_set_drvdata(pdev, dw_plat_pcie); 216 217 switch (dw_plat_pcie->mode) { 218 case DW_PCIE_RC_TYPE: 219 if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_HOST)) 220 return -ENODEV; 221 222 ret = dw_plat_add_pcie_port(dw_plat_pcie, pdev); 223 if (ret < 0) 224 return ret; 225 break; 226 case DW_PCIE_EP_TYPE: 227 if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_EP)) 228 return -ENODEV; 229 230 ret = dw_plat_add_pcie_ep(dw_plat_pcie, pdev); 231 if (ret < 0) 232 return ret; 233 break; 234 default: 235 dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode); 236 } 237 238 return 0; 239 } 240 241 static const struct dw_plat_pcie_of_data dw_plat_pcie_rc_of_data = { 242 .mode = DW_PCIE_RC_TYPE, 243 }; 244 245 static const struct dw_plat_pcie_of_data dw_plat_pcie_ep_of_data = { 246 .mode = DW_PCIE_EP_TYPE, 247 }; 248 249 static const struct of_device_id dw_plat_pcie_of_match[] = { 250 { 251 .compatible = "snps,dw-pcie", 252 .data = &dw_plat_pcie_rc_of_data, 253 }, 254 { 255 .compatible = "snps,dw-pcie-ep", 256 .data = &dw_plat_pcie_ep_of_data, 257 }, 258 {}, 259 }; 260 261 static struct platform_driver dw_plat_pcie_driver = { 262 .driver = { 263 .name = "dw-pcie", 264 .of_match_table = dw_plat_pcie_of_match, 265 .suppress_bind_attrs = true, 266 }, 267 .probe = dw_plat_pcie_probe, 268 }; 269 builtin_platform_driver(dw_plat_pcie_driver); 270