drivers: uio: Add driver for Humusoft MF624 DAQ PCI card

Signed-off-by: Rostislav Lisovy <lisovy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 261 insertions, 0 deletions

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index a81d16389a58..86d98c86e147 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -121,4 +121,17 @@ config UIO_PRUSS
           To compile this driver as a module, choose M here: the module
           will be called uio_pruss.
 
+config UIO_MF624
+        tristate "Humusoft MF624 DAQ PCI card driver"
+        depends on PCI
+        help
+          Userspace I/O interface for the Humusoft MF624 PCI card.
+          A sample userspace application using this driver is available
+          (among other MF624 related information and software components)
+          for download in a git repository:
+
+            git clone git://rtime.felk.cvut.cz/mf6xx.git
+
+          If you compile this as a module, it will be called uio_mf624.
+
 endif
diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
index ea015a290127..d3218bde3aeb 100644
--- a/drivers/uio/Makefile
+++ b/drivers/uio/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_UIO_SERCOS3)	+= uio_sercos3.o
 obj-$(CONFIG_UIO_PCI_GENERIC)   += uio_pci_generic.o
 obj-$(CONFIG_UIO_NETX)  += uio_netx.o
 obj-$(CONFIG_UIO_PRUSS)         += uio_pruss.o
+obj-$(CONFIG_UIO_MF624)         += uio_mf624.o
diff --git a/drivers/uio/uio_mf624.c b/drivers/uio/uio_mf624.c
new file mode 100644
index 000000000000..a1768b2f4493
--- /dev/null
+++ b/drivers/uio/uio_mf624.c
@@ -0,0 +1,247 @@
+/*
+ * UIO driver fo Humusoft MF624 DAQ card.
+ * Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
+ *                    Czech Technical University in Prague
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/uio_driver.h>
+
+#define PCI_VENDOR_ID_HUMUSOFT          0x186c
+#define PCI_DEVICE_ID_MF624             0x0624
+#define PCI_SUBVENDOR_ID_HUMUSOFT       0x186c
+#define PCI_SUBDEVICE_DEVICE            0x0624
+
+/* BAR0 Interrupt control/status register */
+#define INTCSR                          0x4C
+#define INTCSR_ADINT_ENABLE             (1 << 0)
+#define INTCSR_CTR4INT_ENABLE           (1 << 3)
+#define INTCSR_PCIINT_ENABLE            (1 << 6)
+#define INTCSR_ADINT_STATUS             (1 << 2)
+#define INTCSR_CTR4INT_STATUS           (1 << 5)
+
+enum mf624_interrupt_source {ADC, CTR4, ALL};
+
+void mf624_disable_interrupt(enum mf624_interrupt_source source,
+                             struct uio_info *info)
+{
+        void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
+
+        switch (source) {
+        case ADC:
+                iowrite32(ioread32(INTCSR_reg)
+                        & ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE),
+                        INTCSR_reg);
+                break;
+
+        case CTR4:
+                iowrite32(ioread32(INTCSR_reg)
+                        & ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE),
+                        INTCSR_reg);
+                break;
+
+        case ALL:
+        default:
+                iowrite32(ioread32(INTCSR_reg)
+                        & ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
+                            | INTCSR_PCIINT_ENABLE),
+                        INTCSR_reg);
+                break;
+        }
+}
+
+void mf624_enable_interrupt(enum mf624_interrupt_source source,
+                            struct uio_info *info)
+{
+        void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
+
+        switch (source) {
+        case ADC:
+                iowrite32(ioread32(INTCSR_reg)
+                        | INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE,
+                        INTCSR_reg);
+                break;
+
+        case CTR4:
+                iowrite32(ioread32(INTCSR_reg)
+                        | INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE,
+                        INTCSR_reg);
+                break;
+
+        case ALL:
+        default:
+                iowrite32(ioread32(INTCSR_reg)
+                        | INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
+                        | INTCSR_PCIINT_ENABLE,
+                        INTCSR_reg);
+                break;
+        }
+}
+
+static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
+{
+        void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
+
+        if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
+            && (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
+                mf624_disable_interrupt(ADC, info);
+                return IRQ_HANDLED;
+        }
+
+        if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
+            && (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
+                mf624_disable_interrupt(CTR4, info);
+                return IRQ_HANDLED;
+        }
+
+        return IRQ_NONE;
+}
+
+static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
+{
+        if (irq_on == 0)
+                mf624_disable_interrupt(ALL, info);
+        else if (irq_on == 1)
+                mf624_enable_interrupt(ALL, info);
+
+        return 0;
+}
+
+static int mf624_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, "mf624"))
+                goto out_disable;
+
+        info->name = "mf624";
+        info->version = "0.0.1";
+
+        /* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */
+
+        /* BAR0 */
+        info->mem[0].name = "PCI chipset, interrupts, status "
+                        "bits, special functions";
+        info->mem[0].addr = pci_resource_start(dev, 0);
+        if (!info->mem[0].addr)
+                goto out_release;
+        info->mem[0].size = pci_resource_len(dev, 0);
+        info->mem[0].memtype = UIO_MEM_PHYS;
+        info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
+        if (!info->mem[0].internal_addr)
+                goto out_release;
+
+        /* BAR2 */
+        info->mem[1].name = "ADC, DAC, DIO";
+        info->mem[1].addr = pci_resource_start(dev, 2);
+        if (!info->mem[1].addr)
+                goto out_unmap0;
+        info->mem[1].size = pci_resource_len(dev, 2);
+        info->mem[1].memtype = UIO_MEM_PHYS;
+        info->mem[1].internal_addr = pci_ioremap_bar(dev, 2);
+        if (!info->mem[1].internal_addr)
+                goto out_unmap0;
+
+        /* BAR4 */
+        info->mem[2].name = "Counter/timer chip";
+        info->mem[2].addr = pci_resource_start(dev, 4);
+        if (!info->mem[2].addr)
+                goto out_unmap1;
+        info->mem[2].size = pci_resource_len(dev, 4);
+        info->mem[2].memtype = UIO_MEM_PHYS;
+        info->mem[2].internal_addr = pci_ioremap_bar(dev, 4);
+        if (!info->mem[2].internal_addr)
+                goto out_unmap1;
+
+        info->irq = dev->irq;
+        info->irq_flags = IRQF_SHARED;
+        info->handler = mf624_irq_handler;
+
+        info->irqcontrol = mf624_irqcontrol;
+
+        if (uio_register_device(&dev->dev, info))
+                goto out_unmap2;
+
+        pci_set_drvdata(dev, info);
+
+        return 0;
+
+out_unmap2:
+        iounmap(info->mem[2].internal_addr);
+out_unmap1:
+        iounmap(info->mem[1].internal_addr);
+out_unmap0:
+        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 mf624_pci_remove(struct pci_dev *dev)
+{
+        struct uio_info *info = pci_get_drvdata(dev);
+
+        mf624_disable_interrupt(ALL, info);
+
+        uio_unregister_device(info);
+        pci_release_regions(dev);
+        pci_disable_device(dev);
+        pci_set_drvdata(dev, NULL);
+
+        iounmap(info->mem[0].internal_addr);
+        iounmap(info->mem[1].internal_addr);
+        iounmap(info->mem[2].internal_addr);
+
+        kfree(info);
+}
+
+static DEFINE_PCI_DEVICE_TABLE(mf624_pci_id) = {
+        { PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
+        { 0, }
+};
+
+static struct pci_driver mf624_pci_driver = {
+        .name = "mf624",
+        .id_table = mf624_pci_id,
+        .probe = mf624_pci_probe,
+        .remove = mf624_pci_remove,
+};
+MODULE_DEVICE_TABLE(pci, mf624_pci_id);
+
+module_pci_driver(mf624_pci_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");