Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / uio / uio_aec.c

diff --git a/kernel/drivers/uio/uio_aec.c b/kernel/drivers/uio/uio_aec.c
new file mode 100644 (file)
index 0000000..1549fab
--- /dev/null
+++ b/kernel/drivers/uio/uio_aec.c
@@ -0,0 +1,163 @@
+/*
+ * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
+ *
+ * Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
+ *
+ *   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.
+ */
+
+#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");