blob: d1f95a1567bba0a3f598538d5e11dca8308b7f82 [file] [log] [blame]
Rostislav Lisovy06849fa2013-08-30 14:58:02 +02001/*
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
Fengguang Wu497b46d2013-09-02 10:38:33 +020045static void mf624_disable_interrupt(enum mf624_interrupt_source source,
Rostislav Lisovy06849fa2013-08-30 14:58:02 +020046 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
Fengguang Wu497b46d2013-09-02 10:38:33 +020073static void mf624_enable_interrupt(enum mf624_interrupt_source source,
Rostislav Lisovy06849fa2013-08-30 14:58:02 +020074 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_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
131{
132 struct uio_info *info;
133
134 info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
135 if (!info)
136 return -ENOMEM;
137
138 if (pci_enable_device(dev))
139 goto out_free;
140
141 if (pci_request_regions(dev, "mf624"))
142 goto out_disable;
143
144 info->name = "mf624";
145 info->version = "0.0.1";
146
147 /* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */
148
149 /* BAR0 */
150 info->mem[0].name = "PCI chipset, interrupts, status "
151 "bits, special functions";
152 info->mem[0].addr = pci_resource_start(dev, 0);
153 if (!info->mem[0].addr)
154 goto out_release;
155 info->mem[0].size = pci_resource_len(dev, 0);
156 info->mem[0].memtype = UIO_MEM_PHYS;
157 info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
158 if (!info->mem[0].internal_addr)
159 goto out_release;
160
161 /* BAR2 */
162 info->mem[1].name = "ADC, DAC, DIO";
163 info->mem[1].addr = pci_resource_start(dev, 2);
164 if (!info->mem[1].addr)
165 goto out_unmap0;
166 info->mem[1].size = pci_resource_len(dev, 2);
167 info->mem[1].memtype = UIO_MEM_PHYS;
168 info->mem[1].internal_addr = pci_ioremap_bar(dev, 2);
169 if (!info->mem[1].internal_addr)
170 goto out_unmap0;
171
172 /* BAR4 */
173 info->mem[2].name = "Counter/timer chip";
174 info->mem[2].addr = pci_resource_start(dev, 4);
175 if (!info->mem[2].addr)
176 goto out_unmap1;
177 info->mem[2].size = pci_resource_len(dev, 4);
178 info->mem[2].memtype = UIO_MEM_PHYS;
179 info->mem[2].internal_addr = pci_ioremap_bar(dev, 4);
180 if (!info->mem[2].internal_addr)
181 goto out_unmap1;
182
183 info->irq = dev->irq;
184 info->irq_flags = IRQF_SHARED;
185 info->handler = mf624_irq_handler;
186
187 info->irqcontrol = mf624_irqcontrol;
188
189 if (uio_register_device(&dev->dev, info))
190 goto out_unmap2;
191
192 pci_set_drvdata(dev, info);
193
194 return 0;
195
196out_unmap2:
197 iounmap(info->mem[2].internal_addr);
198out_unmap1:
199 iounmap(info->mem[1].internal_addr);
200out_unmap0:
201 iounmap(info->mem[0].internal_addr);
202
203out_release:
204 pci_release_regions(dev);
205
206out_disable:
207 pci_disable_device(dev);
208
209out_free:
210 kfree(info);
211 return -ENODEV;
212}
213
214static void mf624_pci_remove(struct pci_dev *dev)
215{
216 struct uio_info *info = pci_get_drvdata(dev);
217
218 mf624_disable_interrupt(ALL, info);
219
220 uio_unregister_device(info);
221 pci_release_regions(dev);
222 pci_disable_device(dev);
Rostislav Lisovy06849fa2013-08-30 14:58:02 +0200223
224 iounmap(info->mem[0].internal_addr);
225 iounmap(info->mem[1].internal_addr);
226 iounmap(info->mem[2].internal_addr);
227
228 kfree(info);
229}
230
Jingoo Han0f4054d2013-12-03 08:27:13 +0900231static const struct pci_device_id mf624_pci_id[] = {
Rostislav Lisovy06849fa2013-08-30 14:58:02 +0200232 { PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
233 { 0, }
234};
235
236static struct pci_driver mf624_pci_driver = {
237 .name = "mf624",
238 .id_table = mf624_pci_id,
239 .probe = mf624_pci_probe,
240 .remove = mf624_pci_remove,
241};
242MODULE_DEVICE_TABLE(pci, mf624_pci_id);
243
244module_pci_driver(mf624_pci_driver);
245MODULE_LICENSE("GPL v2");
246MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");