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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * UIO driver fo Humusoft MF624 DAQ card.
- * Copyright (C) 2011 Rostislav Lisovy <[email protected]>,
- * Czech Technical University in Prague
- */
- #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};
- static 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;
- }
- }
- static 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_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name)
- {
- resource_size_t start = pci_resource_start(dev, bar);
- resource_size_t len = pci_resource_len(dev, bar);
- mem->name = name;
- mem->addr = start & PAGE_MASK;
- mem->offs = start & ~PAGE_MASK;
- if (!mem->addr)
- return -ENODEV;
- mem->size = ((start & ~PAGE_MASK) + len + PAGE_SIZE - 1) & PAGE_MASK;
- mem->memtype = UIO_MEM_PHYS;
- mem->internal_addr = pci_ioremap_bar(dev, bar);
- if (!mem->internal_addr)
- return -ENODEV;
- return 0;
- }
- static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
- {
- struct uio_info *info;
- info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
- if (!info)
- return -ENOMEM;
- if (pci_enable_device(dev))
- return -ENODEV;
- 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 */
- if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status "
- "bits, special functions"))
- goto out_release;
- /* BAR2 */
- if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO"))
- goto out_unmap0;
- /* BAR4 */
- if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip"))
- 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);
- 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);
- iounmap(info->mem[0].internal_addr);
- iounmap(info->mem[1].internal_addr);
- iounmap(info->mem[2].internal_addr);
- }
- static const struct pci_device_id 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 <[email protected]>");
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