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path: root/drivers/uio/uio_mf624.c
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Diffstat (limited to 'drivers/uio/uio_mf624.c')
-rw-r--r--drivers/uio/uio_mf624.c247
1 files changed, 247 insertions, 0 deletions
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>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 02:08:19 +0000