2 * UIO driver fo Humusoft MF624 DAQ card.
3 * Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
4 * Czech Technical University in Prague
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/device.h>
24 #include <linux/pci.h>
25 #include <linux/slab.h>
27 #include <linux/kernel.h>
28 #include <linux/uio_driver.h>
30 #define PCI_VENDOR_ID_HUMUSOFT 0x186c
31 #define PCI_DEVICE_ID_MF624 0x0624
32 #define PCI_SUBVENDOR_ID_HUMUSOFT 0x186c
33 #define PCI_SUBDEVICE_DEVICE 0x0624
35 /* BAR0 Interrupt control/status register */
37 #define INTCSR_ADINT_ENABLE (1 << 0)
38 #define INTCSR_CTR4INT_ENABLE (1 << 3)
39 #define INTCSR_PCIINT_ENABLE (1 << 6)
40 #define INTCSR_ADINT_STATUS (1 << 2)
41 #define INTCSR_CTR4INT_STATUS (1 << 5)
43 enum mf624_interrupt_source {ADC, CTR4, ALL};
45 static void mf624_disable_interrupt(enum mf624_interrupt_source source,
46 struct uio_info *info)
48 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
52 iowrite32(ioread32(INTCSR_reg)
53 & ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE),
58 iowrite32(ioread32(INTCSR_reg)
59 & ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE),
65 iowrite32(ioread32(INTCSR_reg)
66 & ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
67 | INTCSR_PCIINT_ENABLE),
73 static void mf624_enable_interrupt(enum mf624_interrupt_source source,
74 struct uio_info *info)
76 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
80 iowrite32(ioread32(INTCSR_reg)
81 | INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE,
86 iowrite32(ioread32(INTCSR_reg)
87 | INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE,
93 iowrite32(ioread32(INTCSR_reg)
94 | INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
95 | INTCSR_PCIINT_ENABLE,
101 static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
103 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
105 if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
106 && (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
107 mf624_disable_interrupt(ADC, info);
111 if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
112 && (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
113 mf624_disable_interrupt(CTR4, info);
120 static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
123 mf624_disable_interrupt(ALL, info);
124 else if (irq_on == 1)
125 mf624_enable_interrupt(ALL, info);
130 static int mf624_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name)
132 resource_size_t start = pci_resource_start(dev, bar);
133 resource_size_t len = pci_resource_len(dev, bar);
136 mem->addr = start & PAGE_MASK;
137 mem->offs = start & ~PAGE_MASK;
140 mem->size = ((start & ~PAGE_MASK) + len + PAGE_SIZE - 1) & PAGE_MASK;
141 mem->memtype = UIO_MEM_PHYS;
142 mem->internal_addr = pci_ioremap_bar(dev, bar);
143 if (!mem->internal_addr)
148 static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
150 struct uio_info *info;
152 info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
156 if (pci_enable_device(dev))
159 if (pci_request_regions(dev, "mf624"))
162 info->name = "mf624";
163 info->version = "0.0.1";
165 /* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */
168 if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status "
169 "bits, special functions"))
172 if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO"))
176 if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip"))
179 info->irq = dev->irq;
180 info->irq_flags = IRQF_SHARED;
181 info->handler = mf624_irq_handler;
183 info->irqcontrol = mf624_irqcontrol;
185 if (uio_register_device(&dev->dev, info))
188 pci_set_drvdata(dev, info);
193 iounmap(info->mem[2].internal_addr);
195 iounmap(info->mem[1].internal_addr);
197 iounmap(info->mem[0].internal_addr);
200 pci_release_regions(dev);
203 pci_disable_device(dev);
210 static void mf624_pci_remove(struct pci_dev *dev)
212 struct uio_info *info = pci_get_drvdata(dev);
214 mf624_disable_interrupt(ALL, info);
216 uio_unregister_device(info);
217 pci_release_regions(dev);
218 pci_disable_device(dev);
220 iounmap(info->mem[0].internal_addr);
221 iounmap(info->mem[1].internal_addr);
222 iounmap(info->mem[2].internal_addr);
227 static const struct pci_device_id mf624_pci_id[] = {
228 { PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
232 static struct pci_driver mf624_pci_driver = {
234 .id_table = mf624_pci_id,
235 .probe = mf624_pci_probe,
236 .remove = mf624_pci_remove,
238 MODULE_DEVICE_TABLE(pci, mf624_pci_id);
240 module_pci_driver(mf624_pci_driver);
241 MODULE_LICENSE("GPL v2");
242 MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");