UIO: Hilscher CIF card driver

this is a patch that adds support for Hilscher CIF DeviceNet and
Profibus cards. I tested it on a Kontron CPX board, and Thomas reviewed
it.

You can find the user space part here:

http://www.osadl.org/projects/downloads/UIO/user/cif-0.1.0.tar.gz

Notes: cif_api.c is the main file you want to look at. It contains the
functions to open, close, mmap and so on. cif_dps.c adds functions
specific to Profibus cards, and cif_dn.c contains functions for
DeviceNet cards.  cif.c is a universal playground, it's just a small
test program.  The user space part of this UIO driver is still work in
progress, and not everything is tested yet. At the moment, the thread in
cif_api.c contains some code that artificially makes the card generate
interrupts, this was added for testing and will be removed later. But
the driver already contains all the functions needed for useful
operation, so it gives a good idea of how such a thing looks like.

For comparison, here's what you get from the manufacturer
(www.hilscher.com) when you ask for a Linux 2.6 driver:

http://www.tglx.de/private/hjk/cif-orig-2.6.tar.bz2

WARNING: Don't look at the code for too long, you might become sick :-)


Signed-off-by: Hans-Jürgen Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 156 insertions, 0 deletions

diff --git a/drivers/uio/uio_cif.c b/drivers/uio/uio_cif.c
new file mode 100644
index 000000000000..838bae460831
--- /dev/null
+++ b/drivers/uio/uio_cif.c
@@ -0,0 +1,156 @@
+/*
+ * UIO Hilscher CIF card driver
+ *
+ * (C) 2007 Hans J. Koch <hjk@linutronix.de>
+ * Original code (C) 2005 Benedikt Spranger <b.spranger@linutronix.de>
+ *
+ * Licensed under GPL version 2 only.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/uio_driver.h>
+
+#include <asm/io.h>
+
+#ifndef PCI_DEVICE_ID_PLX_9030
+#define PCI_DEVICE_ID_PLX_9030  0x9030
+#endif
+
+#define PLX9030_INTCSR          0x4C
+#define INTSCR_INT1_ENABLE      0x01
+#define INTSCR_INT1_STATUS      0x04
+#define INT1_ENABLED_AND_ACTIVE (INTSCR_INT1_ENABLE | INTSCR_INT1_STATUS)
+
+#define PCI_SUBVENDOR_ID_PEP    0x1518
+#define CIF_SUBDEVICE_PROFIBUS  0x430
+#define CIF_SUBDEVICE_DEVICENET 0x432
+
+
+static irqreturn_t hilscher_handler(int irq, struct uio_info *dev_info)
+{
+        void __iomem *plx_intscr = dev_info->mem[0].internal_addr
+                                        + PLX9030_INTCSR;
+
+        if ((ioread8(plx_intscr) & INT1_ENABLED_AND_ACTIVE)
+            != INT1_ENABLED_AND_ACTIVE)
+                return IRQ_NONE;
+
+        /* Disable interrupt */
+        iowrite8(ioread8(plx_intscr) & ~INTSCR_INT1_ENABLE, plx_intscr);
+        return IRQ_HANDLED;
+}
+
+static int __devinit hilscher_pci_probe(struct pci_dev *dev,
+                                        const struct pci_device_id *id)
+{
+        struct uio_info *info;
+
+        info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+
+        if (pci_enable_device(dev))
+                goto out_free;
+
+        if (pci_request_regions(dev, "hilscher"))
+                goto out_disable;
+
+        info->mem[0].addr = pci_resource_start(dev, 0);
+        if (!info->mem[0].addr)
+                goto out_release;
+        info->mem[0].internal_addr = ioremap(pci_resource_start(dev, 0),
+                                             pci_resource_len(dev, 0));
+        if (!info->mem[0].internal_addr)
+                goto out_release;
+
+        info->mem[0].size = pci_resource_len(dev, 0);
+        info->mem[0].memtype = UIO_MEM_PHYS;
+        info->mem[1].addr = pci_resource_start(dev, 2);
+        info->mem[1].size = pci_resource_len(dev, 2);
+        info->mem[1].memtype = UIO_MEM_PHYS;
+        switch (id->subdevice) {
+                case CIF_SUBDEVICE_PROFIBUS:
+                        info->name = "CIF_Profibus";
+                        break;
+                case CIF_SUBDEVICE_DEVICENET:
+                        info->name = "CIF_Devicenet";
+                        break;
+                default:
+                        info->name = "CIF_???";
+        }
+        info->version = "0.0.1";
+        info->irq = dev->irq;
+        info->irq_flags = IRQF_DISABLED | IRQF_SHARED;
+        info->handler = hilscher_handler;
+
+        if (uio_register_device(&dev->dev, info))
+                goto out_unmap;
+
+        pci_set_drvdata(dev, info);
+
+        return 0;
+out_unmap:
+        iounmap(info->mem[0].internal_addr);
+out_release:
+        pci_release_regions(dev);
+out_disable:
+        pci_disable_device(dev);
+out_free:
+        kfree (info);
+        return -ENODEV;
+}
+
+static void hilscher_pci_remove(struct pci_dev *dev)
+{
+        struct uio_info *info = pci_get_drvdata(dev);
+
+        uio_unregister_device(info);
+        pci_release_regions(dev);
+        pci_disable_device(dev);
+        pci_set_drvdata(dev, NULL);
+        iounmap(info->mem[0].internal_addr);
+
+        kfree (info);
+}
+
+static struct pci_device_id hilscher_pci_ids[] = {
+        {
+                .vendor =       PCI_VENDOR_ID_PLX,
+                .device =       PCI_DEVICE_ID_PLX_9030,
+                .subvendor =    PCI_SUBVENDOR_ID_PEP,
+                .subdevice =    CIF_SUBDEVICE_PROFIBUS,
+        },
+        {
+                .vendor =       PCI_VENDOR_ID_PLX,
+                .device =       PCI_DEVICE_ID_PLX_9030,
+                .subvendor =    PCI_SUBVENDOR_ID_PEP,
+                .subdevice =    CIF_SUBDEVICE_DEVICENET,
+        },
+        { 0, }
+};
+
+static struct pci_driver hilscher_pci_driver = {
+        .name = "hilscher",
+        .id_table = hilscher_pci_ids,
+        .probe = hilscher_pci_probe,
+        .remove = hilscher_pci_remove,
+};
+
+static int __init hilscher_init_module(void)
+{
+        return pci_register_driver(&hilscher_pci_driver);
+}
+
+static void __exit hilscher_exit_module(void)
+{
+        pci_unregister_driver(&hilscher_pci_driver);
+}
+
+module_init(hilscher_init_module);
+module_exit(hilscher_exit_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Hans J. Koch, Benedikt Spranger");