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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | // SPDX-License-Identifier: GPL-2.0-only /* * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device * * Copyright (C) 2008 Brandon Philips <brandon@ifup.org> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/cdev.h> #include <linux/fs.h> #include <linux/io.h> #include <linux/uaccess.h> #include <linux/uio_driver.h> #include <linux/slab.h> #define PCI_VENDOR_ID_AEC 0xaecb #define PCI_DEVICE_ID_AEC_VITCLTC 0x6250 #define INT_ENABLE_ADDR 0xFC #define INT_ENABLE 0x10 #define INT_DISABLE 0x0 #define INT_MASK_ADDR 0x2E #define INT_MASK_ALL 0x3F #define INTA_DRVR_ADDR 0xFE #define INTA_ENABLED_FLAG 0x08 #define INTA_FLAG 0x01 #define MAILBOX 0x0F static struct pci_device_id ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, { 0, } }; MODULE_DEVICE_TABLE(pci, ids); static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info) { void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR; unsigned char status = ioread8(int_flag); if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) { /* application writes 0x00 to 0x2F to get next interrupt */ status = ioread8(dev_info->priv + MAILBOX); return IRQ_HANDLED; } return IRQ_NONE; } static void print_board_data(struct pci_dev *pdev, struct uio_info *i) { dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x" " revision: %c%c\n", ioread8(i->priv + 0x01), ioread8(i->priv + 0x00), ioread8(i->priv + 0x03), ioread8(i->priv + 0x02), ioread8(i->priv + 0x06), ioread8(i->priv + 0x07)); } static int probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct uio_info *info; int ret; info = devm_kzalloc(&pdev->dev, sizeof(struct uio_info), GFP_KERNEL); if (!info) return -ENOMEM; if (pci_enable_device(pdev)) return -ENODEV; if (pci_request_regions(pdev, "aectc")) goto out_disable; info->name = "aectc"; info->port[0].start = pci_resource_start(pdev, 0); if (!info->port[0].start) goto out_release; info->priv = pci_iomap(pdev, 0, 0); if (!info->priv) goto out_release; info->port[0].size = pci_resource_len(pdev, 0); info->port[0].porttype = UIO_PORT_GPIO; info->version = "0.0.1"; info->irq = pdev->irq; info->irq_flags = IRQF_SHARED; info->handler = aectc_irq; print_board_data(pdev, info); ret = uio_register_device(&pdev->dev, info); if (ret) goto out_unmap; iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR); iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR); if (!(ioread8(info->priv + INTA_DRVR_ADDR) & INTA_ENABLED_FLAG)) dev_err(&pdev->dev, "aectc: interrupts not enabled\n"); pci_set_drvdata(pdev, info); return 0; out_unmap: pci_iounmap(pdev, info->priv); out_release: pci_release_regions(pdev); out_disable: pci_disable_device(pdev); return -ENODEV; } static void remove(struct pci_dev *pdev) { struct uio_info *info = pci_get_drvdata(pdev); /* disable interrupts */ iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR); iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR); /* read mailbox to ensure board drops irq */ ioread8(info->priv + MAILBOX); uio_unregister_device(info); pci_release_regions(pdev); pci_disable_device(pdev); pci_iounmap(pdev, info->priv); } static struct pci_driver pci_driver = { .name = "aectc", .id_table = ids, .probe = probe, .remove = remove, }; module_pci_driver(pci_driver); MODULE_LICENSE("GPL"); |