1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MEN Chameleon Bus. 4 * 5 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de) 6 * Author: Johannes Thumshirn <johannes.thumshirn@men.de> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/pci.h> 11 #include <linux/mcb.h> 12 13 #include "mcb-internal.h" 14 15 struct priv { 16 struct mcb_bus *bus; 17 phys_addr_t mapbase; 18 void __iomem *base; 19 }; 20 21 static int mcb_pci_get_irq(struct mcb_device *mdev) 22 { 23 struct mcb_bus *mbus = mdev->bus; 24 struct device *dev = mbus->carrier; 25 struct pci_dev *pdev = to_pci_dev(dev); 26 27 return pdev->irq; 28 } 29 30 static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 31 { 32 struct resource *res; 33 struct priv *priv; 34 int ret; 35 unsigned long flags; 36 37 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL); 38 if (!priv) 39 return -ENOMEM; 40 41 ret = pci_enable_device(pdev); 42 if (ret) { 43 dev_err(&pdev->dev, "Failed to enable PCI device\n"); 44 return -ENODEV; 45 } 46 pci_set_master(pdev); 47 48 priv->mapbase = pci_resource_start(pdev, 0); 49 if (!priv->mapbase) { 50 dev_err(&pdev->dev, "No PCI resource\n"); 51 ret = -ENODEV; 52 goto out_disable; 53 } 54 55 res = devm_request_mem_region(&pdev->dev, priv->mapbase, 56 CHAM_HEADER_SIZE, 57 KBUILD_MODNAME); 58 if (!res) { 59 dev_err(&pdev->dev, "Failed to request PCI memory\n"); 60 ret = -EBUSY; 61 goto out_disable; 62 } 63 64 priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE); 65 if (!priv->base) { 66 dev_err(&pdev->dev, "Cannot ioremap\n"); 67 ret = -ENOMEM; 68 goto out_disable; 69 } 70 71 flags = pci_resource_flags(pdev, 0); 72 if (flags & IORESOURCE_IO) { 73 ret = -ENOTSUPP; 74 dev_err(&pdev->dev, 75 "IO mapped PCI devices are not supported\n"); 76 goto out_disable; 77 } 78 79 pci_set_drvdata(pdev, priv); 80 81 priv->bus = mcb_alloc_bus(&pdev->dev); 82 if (IS_ERR(priv->bus)) { 83 ret = PTR_ERR(priv->bus); 84 goto out_disable; 85 } 86 87 priv->bus->get_irq = mcb_pci_get_irq; 88 89 ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base); 90 if (ret < 0) 91 goto out_mcb_bus; 92 93 dev_dbg(&pdev->dev, "Found %d cells\n", ret); 94 95 mcb_bus_add_devices(priv->bus); 96 97 return 0; 98 99 out_mcb_bus: 100 mcb_release_bus(priv->bus); 101 out_disable: 102 pci_disable_device(pdev); 103 return ret; 104 } 105 106 static void mcb_pci_remove(struct pci_dev *pdev) 107 { 108 struct priv *priv = pci_get_drvdata(pdev); 109 110 mcb_release_bus(priv->bus); 111 112 pci_disable_device(pdev); 113 } 114 115 static const struct pci_device_id mcb_pci_tbl[] = { 116 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, 117 { PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_MEN_CHAMELEON) }, 118 { 0 }, 119 }; 120 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); 121 122 static struct pci_driver mcb_pci_driver = { 123 .name = "mcb-pci", 124 .id_table = mcb_pci_tbl, 125 .probe = mcb_pci_probe, 126 .remove = mcb_pci_remove, 127 }; 128 129 module_pci_driver(mcb_pci_driver); 130 131 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 132 MODULE_LICENSE("GPL"); 133 MODULE_DESCRIPTION("MCB over PCI support"); 134