1/* 2 * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device 3 * 4 * Copyright (C) 2008 Brandon Philips <brandon@ifup.org> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published 8 * by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 59 17 * Temple Place, Suite 330, Boston, MA 02111-1307, USA. 18 */ 19 20#include <linux/kernel.h> 21#include <linux/module.h> 22#include <linux/pci.h> 23#include <linux/init.h> 24#include <linux/interrupt.h> 25#include <linux/cdev.h> 26#include <linux/fs.h> 27#include <linux/io.h> 28#include <linux/uaccess.h> 29#include <linux/uio_driver.h> 30#include <linux/slab.h> 31 32#define PCI_VENDOR_ID_AEC 0xaecb 33#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250 34 35#define INT_ENABLE_ADDR 0xFC 36#define INT_ENABLE 0x10 37#define INT_DISABLE 0x0 38 39#define INT_MASK_ADDR 0x2E 40#define INT_MASK_ALL 0x3F 41 42#define INTA_DRVR_ADDR 0xFE 43#define INTA_ENABLED_FLAG 0x08 44#define INTA_FLAG 0x01 45 46#define MAILBOX 0x0F 47 48static struct pci_device_id ids[] = { 49 { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, 50 { 0, } 51}; 52MODULE_DEVICE_TABLE(pci, ids); 53 54static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info) 55{ 56 void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR; 57 unsigned char status = ioread8(int_flag); 58 59 60 if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) { 61 /* application writes 0x00 to 0x2F to get next interrupt */ 62 status = ioread8(dev_info->priv + MAILBOX); 63 return IRQ_HANDLED; 64 } 65 66 return IRQ_NONE; 67} 68 69static void print_board_data(struct pci_dev *pdev, struct uio_info *i) 70{ 71 dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x" 72 " revision: %c%c\n", 73 ioread8(i->priv + 0x01), 74 ioread8(i->priv + 0x00), 75 ioread8(i->priv + 0x03), 76 ioread8(i->priv + 0x02), 77 ioread8(i->priv + 0x06), 78 ioread8(i->priv + 0x07)); 79} 80 81static int __devinit probe(struct pci_dev *pdev, const struct pci_device_id *id) 82{ 83 struct uio_info *info; 84 int ret; 85 86 info = kzalloc(sizeof(struct uio_info), GFP_KERNEL); 87 if (!info) 88 return -ENOMEM; 89 90 if (pci_enable_device(pdev)) 91 goto out_free; 92 93 if (pci_request_regions(pdev, "aectc")) 94 goto out_disable; 95 96 info->name = "aectc"; 97 info->port[0].start = pci_resource_start(pdev, 0); 98 if (!info->port[0].start) 99 goto out_release; 100 info->priv = pci_iomap(pdev, 0, 0); 101 if (!info->priv) 102 goto out_release; 103 info->port[0].size = pci_resource_len(pdev, 0); 104 info->port[0].porttype = UIO_PORT_GPIO; 105 106 info->version = "0.0.1"; 107 info->irq = pdev->irq; 108 info->irq_flags = IRQF_SHARED; 109 info->handler = aectc_irq; 110 111 print_board_data(pdev, info); 112 ret = uio_register_device(&pdev->dev, info); 113 if (ret) 114 goto out_unmap; 115 116 iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR); 117 iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR); 118 if (!(ioread8(info->priv + INTA_DRVR_ADDR) 119 & INTA_ENABLED_FLAG)) 120 dev_err(&pdev->dev, "aectc: interrupts not enabled\n"); 121 122 pci_set_drvdata(pdev, info); 123 124 return 0; 125 126out_unmap: 127 pci_iounmap(pdev, info->priv); 128out_release: 129 pci_release_regions(pdev); 130out_disable: 131 pci_disable_device(pdev); 132out_free: 133 kfree(info); 134 return -ENODEV; 135} 136 137static void remove(struct pci_dev *pdev) 138{ 139 struct uio_info *info = pci_get_drvdata(pdev); 140 141 /* disable interrupts */ 142 iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR); 143 iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR); 144 /* read mailbox to ensure board drops irq */ 145 ioread8(info->priv + MAILBOX); 146 147 uio_unregister_device(info); 148 pci_release_regions(pdev); 149 pci_disable_device(pdev); 150 pci_set_drvdata(pdev, NULL); 151 iounmap(info->priv); 152 153 kfree(info); 154} 155 156static struct pci_driver pci_driver = { 157 .name = "aectc", 158 .id_table = ids, 159 .probe = probe, 160 .remove = remove, 161}; 162 163static int __init aectc_init(void) 164{ 165 return pci_register_driver(&pci_driver); 166} 167 168static void __exit aectc_exit(void) 169{ 170 pci_unregister_driver(&pci_driver); 171} 172 173MODULE_LICENSE("GPL"); 174 175module_init(aectc_init); 176module_exit(aectc_exit); 177