148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
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*
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* Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/uio_driver.h>
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#include <linux/slab.h>
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#define PCI_VENDOR_ID_AEC 0xaecb
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#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250
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#define INT_ENABLE_ADDR 0xFC
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#define INT_ENABLE 0x10
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#define INT_DISABLE 0x0
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#define INT_MASK_ADDR 0x2E
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#define INT_MASK_ALL 0x3F
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#define INTA_DRVR_ADDR 0xFE
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#define INTA_ENABLED_FLAG 0x08
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#define INTA_FLAG 0x01
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#define MAILBOX 0x0F
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static struct pci_device_id ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, ids);
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static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
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{
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void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
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unsigned char status = ioread8(int_flag);
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if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
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/* application writes 0x00 to 0x2F to get next interrupt */
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status = ioread8(dev_info->priv + MAILBOX);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static void print_board_data(struct pci_dev *pdev, struct uio_info *i)
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{
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dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
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" revision: %c%c\n",
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ioread8(i->priv + 0x01),
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ioread8(i->priv + 0x00),
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ioread8(i->priv + 0x03),
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ioread8(i->priv + 0x02),
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ioread8(i->priv + 0x06),
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ioread8(i->priv + 0x07));
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}
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static int probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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struct uio_info *info;
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int ret;
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info = devm_kzalloc(&pdev->dev, sizeof(struct uio_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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if (pci_enable_device(pdev))
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return -ENODEV;
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if (pci_request_regions(pdev, "aectc"))
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goto out_disable;
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info->name = "aectc";
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info->port[0].start = pci_resource_start(pdev, 0);
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if (!info->port[0].start)
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goto out_release;
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info->priv = pci_iomap(pdev, 0, 0);
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if (!info->priv)
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goto out_release;
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info->port[0].size = pci_resource_len(pdev, 0);
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info->port[0].porttype = UIO_PORT_GPIO;
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info->version = "0.0.1";
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info->irq = pdev->irq;
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info->irq_flags = IRQF_SHARED;
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info->handler = aectc_irq;
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print_board_data(pdev, info);
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ret = uio_register_device(&pdev->dev, info);
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if (ret)
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goto out_unmap;
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iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
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iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
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if (!(ioread8(info->priv + INTA_DRVR_ADDR)
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& INTA_ENABLED_FLAG))
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dev_err(&pdev->dev, "aectc: interrupts not enabled\n");
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pci_set_drvdata(pdev, info);
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return 0;
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out_unmap:
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pci_iounmap(pdev, info->priv);
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out_release:
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pci_release_regions(pdev);
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out_disable:
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pci_disable_device(pdev);
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return -ENODEV;
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}
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static void remove(struct pci_dev *pdev)
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{
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struct uio_info *info = pci_get_drvdata(pdev);
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/* disable interrupts */
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iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
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iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
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/* read mailbox to ensure board drops irq */
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ioread8(info->priv + MAILBOX);
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uio_unregister_device(info);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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pci_iounmap(pdev, info->priv);
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}
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static struct pci_driver pci_driver = {
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.name = "aectc",
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.id_table = ids,
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.probe = probe,
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.remove = remove,
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};
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module_pci_driver(pci_driver);
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MODULE_LICENSE("GPL");
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