Brandon Philips | 1bafeb3 | 2009-01-27 13:00:04 -0800 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/slab.h> |
Brandon Philips | 1bafeb3 | 2009-01-27 13:00:04 -0800 | [diff] [blame] | 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 | |
| 48 | static struct pci_device_id ids[] = { |
| 49 | { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, |
| 50 | { 0, } |
| 51 | }; |
| 52 | MODULE_DEVICE_TABLE(pci, ids); |
| 53 | |
| 54 | static 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 | |
| 69 | static 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 | |
Bill Pemberton | b17b75b | 2012-11-19 13:21:49 -0500 | [diff] [blame] | 81 | static int probe(struct pci_dev *pdev, const struct pci_device_id *id) |
Brandon Philips | 1bafeb3 | 2009-01-27 13:00:04 -0800 | [diff] [blame] | 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 | |
| 126 | out_unmap: |
| 127 | pci_iounmap(pdev, info->priv); |
| 128 | out_release: |
| 129 | pci_release_regions(pdev); |
| 130 | out_disable: |
| 131 | pci_disable_device(pdev); |
| 132 | out_free: |
| 133 | kfree(info); |
| 134 | return -ENODEV; |
| 135 | } |
| 136 | |
| 137 | static 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 | |
| 156 | static struct pci_driver pci_driver = { |
| 157 | .name = "aectc", |
| 158 | .id_table = ids, |
| 159 | .probe = probe, |
| 160 | .remove = remove, |
| 161 | }; |
| 162 | |
Peter Huewe | aa8c06f | 2013-05-20 22:47:41 +0200 | [diff] [blame^] | 163 | module_pci_driver(pci_driver); |
Brandon Philips | 1bafeb3 | 2009-01-27 13:00:04 -0800 | [diff] [blame] | 164 | MODULE_LICENSE("GPL"); |