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8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/device.h>
11#include <linux/pci.h>
12#include <linux/slab.h>
13#include <linux/io.h>
14#include <linux/kernel.h>
15#include <linux/uio_driver.h>
16
17#define PCI_VENDOR_ID_HUMUSOFT 0x186c
18#define PCI_DEVICE_ID_MF624 0x0624
19#define PCI_SUBVENDOR_ID_HUMUSOFT 0x186c
20#define PCI_SUBDEVICE_DEVICE 0x0624
21
22
23#define INTCSR 0x4C
24#define INTCSR_ADINT_ENABLE (1 << 0)
25#define INTCSR_CTR4INT_ENABLE (1 << 3)
26#define INTCSR_PCIINT_ENABLE (1 << 6)
27#define INTCSR_ADINT_STATUS (1 << 2)
28#define INTCSR_CTR4INT_STATUS (1 << 5)
29
30enum mf624_interrupt_source {ADC, CTR4, ALL};
31
32static void mf624_disable_interrupt(enum mf624_interrupt_source source,
33 struct uio_info *info)
34{
35 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
36
37 switch (source) {
38 case ADC:
39 iowrite32(ioread32(INTCSR_reg)
40 & ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE),
41 INTCSR_reg);
42 break;
43
44 case CTR4:
45 iowrite32(ioread32(INTCSR_reg)
46 & ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE),
47 INTCSR_reg);
48 break;
49
50 case ALL:
51 default:
52 iowrite32(ioread32(INTCSR_reg)
53 & ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
54 | INTCSR_PCIINT_ENABLE),
55 INTCSR_reg);
56 break;
57 }
58}
59
60static void mf624_enable_interrupt(enum mf624_interrupt_source source,
61 struct uio_info *info)
62{
63 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
64
65 switch (source) {
66 case ADC:
67 iowrite32(ioread32(INTCSR_reg)
68 | INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE,
69 INTCSR_reg);
70 break;
71
72 case CTR4:
73 iowrite32(ioread32(INTCSR_reg)
74 | INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE,
75 INTCSR_reg);
76 break;
77
78 case ALL:
79 default:
80 iowrite32(ioread32(INTCSR_reg)
81 | INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
82 | INTCSR_PCIINT_ENABLE,
83 INTCSR_reg);
84 break;
85 }
86}
87
88static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
89{
90 void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
91
92 if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
93 && (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
94 mf624_disable_interrupt(ADC, info);
95 return IRQ_HANDLED;
96 }
97
98 if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
99 && (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
100 mf624_disable_interrupt(CTR4, info);
101 return IRQ_HANDLED;
102 }
103
104 return IRQ_NONE;
105}
106
107static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
108{
109 if (irq_on == 0)
110 mf624_disable_interrupt(ALL, info);
111 else if (irq_on == 1)
112 mf624_enable_interrupt(ALL, info);
113
114 return 0;
115}
116
117static int mf624_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name)
118{
119 resource_size_t start = pci_resource_start(dev, bar);
120 resource_size_t len = pci_resource_len(dev, bar);
121
122 mem->name = name;
123 mem->addr = start & PAGE_MASK;
124 mem->offs = start & ~PAGE_MASK;
125 if (!mem->addr)
126 return -ENODEV;
127 mem->size = ((start & ~PAGE_MASK) + len + PAGE_SIZE - 1) & PAGE_MASK;
128 mem->memtype = UIO_MEM_PHYS;
129 mem->internal_addr = pci_ioremap_bar(dev, bar);
130 if (!mem->internal_addr)
131 return -ENODEV;
132 return 0;
133}
134
135static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
136{
137 struct uio_info *info;
138
139 info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
140 if (!info)
141 return -ENOMEM;
142
143 if (pci_enable_device(dev))
144 goto out_free;
145
146 if (pci_request_regions(dev, "mf624"))
147 goto out_disable;
148
149 info->name = "mf624";
150 info->version = "0.0.1";
151
152
153
154
155 if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status "
156 "bits, special functions"))
157 goto out_release;
158
159 if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO"))
160 goto out_unmap0;
161
162
163 if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip"))
164 goto out_unmap1;
165
166 info->irq = dev->irq;
167 info->irq_flags = IRQF_SHARED;
168 info->handler = mf624_irq_handler;
169
170 info->irqcontrol = mf624_irqcontrol;
171
172 if (uio_register_device(&dev->dev, info))
173 goto out_unmap2;
174
175 pci_set_drvdata(dev, info);
176
177 return 0;
178
179out_unmap2:
180 iounmap(info->mem[2].internal_addr);
181out_unmap1:
182 iounmap(info->mem[1].internal_addr);
183out_unmap0:
184 iounmap(info->mem[0].internal_addr);
185
186out_release:
187 pci_release_regions(dev);
188
189out_disable:
190 pci_disable_device(dev);
191
192out_free:
193 kfree(info);
194 return -ENODEV;
195}
196
197static void mf624_pci_remove(struct pci_dev *dev)
198{
199 struct uio_info *info = pci_get_drvdata(dev);
200
201 mf624_disable_interrupt(ALL, info);
202
203 uio_unregister_device(info);
204 pci_release_regions(dev);
205 pci_disable_device(dev);
206
207 iounmap(info->mem[0].internal_addr);
208 iounmap(info->mem[1].internal_addr);
209 iounmap(info->mem[2].internal_addr);
210
211 kfree(info);
212}
213
214static const struct pci_device_id mf624_pci_id[] = {
215 { PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
216 { 0, }
217};
218
219static struct pci_driver mf624_pci_driver = {
220 .name = "mf624",
221 .id_table = mf624_pci_id,
222 .probe = mf624_pci_probe,
223 .remove = mf624_pci_remove,
224};
225MODULE_DEVICE_TABLE(pci, mf624_pci_id);
226
227module_pci_driver(mf624_pci_driver);
228MODULE_LICENSE("GPL v2");
229MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");
230
