1/*
2 * UIO driver fo Humusoft MF624 DAQ card.
3 * Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
4 * Czech Technical University in Prague
5 *
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.
10 *
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.
15 *
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.
19 */
20
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>
26#include <linux/io.h>
27#include <linux/kernel.h>
28#include <linux/uio_driver.h>
29
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
34
35/* BAR0 Interrupt control/status register */
36#define INTCSR 0x4C
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)
42
43enum mf624_interrupt_source {ADC, CTR4, ALL};
44
45static void mf624_disable_interrupt(enum mf624_interrupt_source source,
46 struct uio_info *info)
47{
48 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
49
50 switch (source) {
51 case ADC:
52 iowrite32(ioread32(INTCSR_reg)
53 & ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE),
54 INTCSR_reg);
55 break;
56
57 case CTR4:
58 iowrite32(ioread32(INTCSR_reg)
59 & ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE),
60 INTCSR_reg);
61 break;
62
63 case ALL:
64 default:
65 iowrite32(ioread32(INTCSR_reg)
66 & ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
67 | INTCSR_PCIINT_ENABLE),
68 INTCSR_reg);
69 break;
70 }
71}
72
73static void mf624_enable_interrupt(enum mf624_interrupt_source source,
74 struct uio_info *info)
75{
76 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
77
78 switch (source) {
79 case ADC:
80 iowrite32(ioread32(INTCSR_reg)
81 | INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE,
82 INTCSR_reg);
83 break;
84
85 case CTR4:
86 iowrite32(ioread32(INTCSR_reg)
87 | INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE,
88 INTCSR_reg);
89 break;
90
91 case ALL:
92 default:
93 iowrite32(ioread32(INTCSR_reg)
94 | INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
95 | INTCSR_PCIINT_ENABLE,
96 INTCSR_reg);
97 break;
98 }
99}
100
101static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
102{
103 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
104
105 if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
106 && (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
107 mf624_disable_interrupt(ADC, info);
108 return IRQ_HANDLED;
109 }
110
111 if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
112 && (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
113 mf624_disable_interrupt(CTR4, info);
114 return IRQ_HANDLED;
115 }
116
117 return IRQ_NONE;
118}
119
120static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
121{
122 if (irq_on == 0)
123 mf624_disable_interrupt(ALL, info);
124 else if (irq_on == 1)
125 mf624_enable_interrupt(ALL, info);
126
127 return 0;
128}
129
130static int mf624_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name)
131{
132 resource_size_t start = pci_resource_start(dev, bar);
133 resource_size_t len = pci_resource_len(dev, bar);
134
135 mem->name = name;
136 mem->addr = start & PAGE_MASK;
137 mem->offs = start & ~PAGE_MASK;
138 if (!mem->addr)
139 return -ENODEV;
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)
144 return -ENODEV;
145 return 0;
146}
147
148static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
149{
150 struct uio_info *info;
151
152 info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
153 if (!info)
154 return -ENOMEM;
155
156 if (pci_enable_device(dev))
157 goto out_free;
158
159 if (pci_request_regions(dev, "mf624"))
160 goto out_disable;
161
162 info->name = "mf624";
163 info->version = "0.0.1";
164
165 /* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */
166
167 /* BAR0 */
168 if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status "
169 "bits, special functions"))
170 goto out_release;
171 /* BAR2 */
172 if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO"))
173 goto out_unmap0;
174
175 /* BAR4 */
176 if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip"))
177 goto out_unmap1;
178
179 info->irq = dev->irq;
180 info->irq_flags = IRQF_SHARED;
181 info->handler = mf624_irq_handler;
182
183 info->irqcontrol = mf624_irqcontrol;
184
185 if (uio_register_device(&dev->dev, info))
186 goto out_unmap2;
187
188 pci_set_drvdata(dev, info);
189
190 return 0;
191
192out_unmap2:
193 iounmap(info->mem[2].internal_addr);
194out_unmap1:
195 iounmap(info->mem[1].internal_addr);
196out_unmap0:
197 iounmap(info->mem[0].internal_addr);
198
199out_release:
200 pci_release_regions(dev);
201
202out_disable:
203 pci_disable_device(dev);
204
205out_free:
206 kfree(info);
207 return -ENODEV;
208}
209
210static void mf624_pci_remove(struct pci_dev *dev)
211{
212 struct uio_info *info = pci_get_drvdata(dev);
213
214 mf624_disable_interrupt(ALL, info);
215
216 uio_unregister_device(info);
217 pci_release_regions(dev);
218 pci_disable_device(dev);
219
220 iounmap(info->mem[0].internal_addr);
221 iounmap(info->mem[1].internal_addr);
222 iounmap(info->mem[2].internal_addr);
223
224 kfree(info);
225}
226
227static const struct pci_device_id mf624_pci_id[] = {
228 { PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
229 { 0, }
230};
231
232static struct pci_driver mf624_pci_driver = {
233 .name = "mf624",
234 .id_table = mf624_pci_id,
235 .probe = mf624_pci_probe,
236 .remove = mf624_pci_remove,
237};
238MODULE_DEVICE_TABLE(pci, mf624_pci_id);
239
240module_pci_driver(mf624_pci_driver);
241MODULE_LICENSE("GPL v2");
242MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");
243