// 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 = kzalloc(sizeof(struct uio_info), GFP_KERNEL); if (!info) return -ENOMEM; if (pci_enable_device(pdev)) goto out_free; 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); out_free: kfree(info); 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); iounmap(info->priv); kfree(info); } static struct pci_driver pci_driver = { .name = "aectc", .id_table = ids, .probe = probe, .remove = remove, }; module_pci_driver(pci_driver); MODULE_LICENSE("GPL");