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4505153954
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 136 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
152 lines
3.4 KiB
C
152 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 = kzalloc(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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goto out_free;
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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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out_free:
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kfree(info);
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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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iounmap(info->priv);
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kfree(info);
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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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