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 void __iomem *base; 21 }; 22 23 static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 24 { 25 struct priv *priv; 26 phys_addr_t mapbase; 27 int ret; 28 int num_cells; 29 unsigned long flags; 30 31 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL); 32 if (!priv) 33 return -ENOMEM; 34 35 ret = pci_enable_device(pdev); 36 if (ret) { 37 dev_err(&pdev->dev, "Failed to enable PCI device\n"); 38 return -ENODEV; 39 } 40 41 mapbase = pci_resource_start(pdev, 0); 42 if (!mapbase) { 43 dev_err(&pdev->dev, "No PCI resource\n"); 44 goto err_start; 45 } 46 47 ret = pci_request_region(pdev, 0, KBUILD_MODNAME); 48 if (ret) { 49 dev_err(&pdev->dev, "Failed to request PCI BARs\n"); 50 goto err_start; 51 } 52 53 priv->base = pci_iomap(pdev, 0, 0); 54 if (!priv->base) { 55 dev_err(&pdev->dev, "Cannot ioremap\n"); 56 ret = -ENOMEM; 57 goto err_ioremap; 58 } 59 60 flags = pci_resource_flags(pdev, 0); 61 if (flags & IORESOURCE_IO) { 62 ret = -ENOTSUPP; 63 dev_err(&pdev->dev, 64 "IO mapped PCI devices are not supported\n"); 65 goto err_ioremap; 66 } 67 68 pci_set_drvdata(pdev, priv); 69 70 priv->bus = mcb_alloc_bus(); 71 72 ret = chameleon_parse_cells(priv->bus, mapbase, priv->base); 73 if (ret < 0) 74 goto err_drvdata; 75 num_cells = ret; 76 77 dev_dbg(&pdev->dev, "Found %d cells\n", num_cells); 78 79 mcb_bus_add_devices(priv->bus); 80 81 err_drvdata: 82 pci_iounmap(pdev, priv->base); 83 err_ioremap: 84 pci_release_region(pdev, 0); 85 err_start: 86 pci_disable_device(pdev); 87 return ret; 88 } 89 90 static void mcb_pci_remove(struct pci_dev *pdev) 91 { 92 struct priv *priv = pci_get_drvdata(pdev); 93 94 mcb_release_bus(priv->bus); 95 } 96 97 static const struct pci_device_id mcb_pci_tbl[] = { 98 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, 99 { 0 }, 100 }; 101 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); 102 103 static struct pci_driver mcb_pci_driver = { 104 .name = "mcb-pci", 105 .id_table = mcb_pci_tbl, 106 .probe = mcb_pci_probe, 107 .remove = mcb_pci_remove, 108 }; 109 110 module_pci_driver(mcb_pci_driver); 111 112 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 113 MODULE_LICENSE("GPL"); 114 MODULE_DESCRIPTION("MCB over PCI support"); 115