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 int num_cells; 39 unsigned long flags; 40 41 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL); 42 if (!priv) 43 return -ENOMEM; 44 45 ret = pci_enable_device(pdev); 46 if (ret) { 47 dev_err(&pdev->dev, "Failed to enable PCI device\n"); 48 return -ENODEV; 49 } 50 51 priv->mapbase = pci_resource_start(pdev, 0); 52 if (!priv->mapbase) { 53 dev_err(&pdev->dev, "No PCI resource\n"); 54 goto out_disable; 55 } 56 57 res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE, 58 KBUILD_MODNAME); 59 if (IS_ERR(res)) { 60 dev_err(&pdev->dev, "Failed to request PCI memory\n"); 61 ret = PTR_ERR(res); 62 goto out_disable; 63 } 64 65 priv->base = ioremap(priv->mapbase, CHAM_HEADER_SIZE); 66 if (!priv->base) { 67 dev_err(&pdev->dev, "Cannot ioremap\n"); 68 ret = -ENOMEM; 69 goto out_release; 70 } 71 72 flags = pci_resource_flags(pdev, 0); 73 if (flags & IORESOURCE_IO) { 74 ret = -ENOTSUPP; 75 dev_err(&pdev->dev, 76 "IO mapped PCI devices are not supported\n"); 77 goto out_release; 78 } 79 80 pci_set_drvdata(pdev, priv); 81 82 priv->bus = mcb_alloc_bus(&pdev->dev); 83 if (IS_ERR(priv->bus)) { 84 ret = PTR_ERR(priv->bus); 85 goto out_iounmap; 86 } 87 88 priv->bus->get_irq = mcb_pci_get_irq; 89 90 ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base); 91 if (ret < 0) 92 goto out_iounmap; 93 num_cells = ret; 94 95 dev_dbg(&pdev->dev, "Found %d cells\n", num_cells); 96 97 mcb_bus_add_devices(priv->bus); 98 99 return 0; 100 101 out_iounmap: 102 iounmap(priv->base); 103 out_release: 104 pci_release_region(pdev, 0); 105 out_disable: 106 pci_disable_device(pdev); 107 return ret; 108 } 109 110 static void mcb_pci_remove(struct pci_dev *pdev) 111 { 112 struct priv *priv = pci_get_drvdata(pdev); 113 114 mcb_release_bus(priv->bus); 115 116 iounmap(priv->base); 117 release_region(priv->mapbase, CHAM_HEADER_SIZE); 118 pci_disable_device(pdev); 119 } 120 121 static const struct pci_device_id mcb_pci_tbl[] = { 122 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, 123 { 0 }, 124 }; 125 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); 126 127 static struct pci_driver mcb_pci_driver = { 128 .name = "mcb-pci", 129 .id_table = mcb_pci_tbl, 130 .probe = mcb_pci_probe, 131 .remove = mcb_pci_remove, 132 }; 133 134 module_pci_driver(mcb_pci_driver); 135 136 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 137 MODULE_LICENSE("GPL"); 138 MODULE_DESCRIPTION("MCB over PCI support"); 139