1 /* 2 * MEN Chameleon Bus. 3 * 4 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de) 5 * Author: Johannes Thumshirn <johannes.thumshirn@men.de> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; version 2 of the License. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/pci.h> 14 #include <linux/mcb.h> 15 16 #include "mcb-internal.h" 17 18 struct priv { 19 struct mcb_bus *bus; 20 phys_addr_t mapbase; 21 void __iomem *base; 22 }; 23 24 static int mcb_pci_get_irq(struct mcb_device *mdev) 25 { 26 struct mcb_bus *mbus = mdev->bus; 27 struct device *dev = mbus->carrier; 28 struct pci_dev *pdev = to_pci_dev(dev); 29 30 return pdev->irq; 31 } 32 33 static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 34 { 35 struct resource *res; 36 struct priv *priv; 37 int ret; 38 unsigned long flags; 39 40 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL); 41 if (!priv) 42 return -ENOMEM; 43 44 ret = pci_enable_device(pdev); 45 if (ret) { 46 dev_err(&pdev->dev, "Failed to enable PCI device\n"); 47 return -ENODEV; 48 } 49 pci_set_master(pdev); 50 51 priv->mapbase = pci_resource_start(pdev, 0); 52 if (!priv->mapbase) { 53 dev_err(&pdev->dev, "No PCI resource\n"); 54 ret = -ENODEV; 55 goto out_disable; 56 } 57 58 res = devm_request_mem_region(&pdev->dev, priv->mapbase, 59 CHAM_HEADER_SIZE, 60 KBUILD_MODNAME); 61 if (!res) { 62 dev_err(&pdev->dev, "Failed to request PCI memory\n"); 63 ret = -EBUSY; 64 goto out_disable; 65 } 66 67 priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE); 68 if (!priv->base) { 69 dev_err(&pdev->dev, "Cannot ioremap\n"); 70 ret = -ENOMEM; 71 goto out_disable; 72 } 73 74 flags = pci_resource_flags(pdev, 0); 75 if (flags & IORESOURCE_IO) { 76 ret = -ENOTSUPP; 77 dev_err(&pdev->dev, 78 "IO mapped PCI devices are not supported\n"); 79 goto out_disable; 80 } 81 82 pci_set_drvdata(pdev, priv); 83 84 priv->bus = mcb_alloc_bus(&pdev->dev); 85 if (IS_ERR(priv->bus)) { 86 ret = PTR_ERR(priv->bus); 87 goto out_disable; 88 } 89 90 priv->bus->get_irq = mcb_pci_get_irq; 91 92 ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base); 93 if (ret < 0) 94 goto out_mcb_bus; 95 96 dev_dbg(&pdev->dev, "Found %d cells\n", ret); 97 98 mcb_bus_add_devices(priv->bus); 99 100 return 0; 101 102 out_mcb_bus: 103 mcb_release_bus(priv->bus); 104 out_disable: 105 pci_disable_device(pdev); 106 return ret; 107 } 108 109 static void mcb_pci_remove(struct pci_dev *pdev) 110 { 111 struct priv *priv = pci_get_drvdata(pdev); 112 113 mcb_release_bus(priv->bus); 114 115 pci_disable_device(pdev); 116 } 117 118 static const struct pci_device_id mcb_pci_tbl[] = { 119 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, 120 { PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_MEN_CHAMELEON) }, 121 { 0 }, 122 }; 123 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); 124 125 static struct pci_driver mcb_pci_driver = { 126 .name = "mcb-pci", 127 .id_table = mcb_pci_tbl, 128 .probe = mcb_pci_probe, 129 .remove = mcb_pci_remove, 130 }; 131 132 module_pci_driver(mcb_pci_driver); 133 134 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 135 MODULE_LICENSE("GPL"); 136 MODULE_DESCRIPTION("MCB over PCI support"); 137