1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device |
4 | * |
5 | * Copyright (C) 2008 Brandon Philips <brandon@ifup.org> |
6 | */ |
7 | |
8 | #include <linux/kernel.h> |
9 | #include <linux/module.h> |
10 | #include <linux/pci.h> |
11 | #include <linux/init.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/cdev.h> |
14 | #include <linux/fs.h> |
15 | #include <linux/io.h> |
16 | #include <linux/uaccess.h> |
17 | #include <linux/uio_driver.h> |
18 | #include <linux/slab.h> |
19 | |
20 | #define PCI_VENDOR_ID_AEC 0xaecb |
21 | #define PCI_DEVICE_ID_AEC_VITCLTC 0x6250 |
22 | |
23 | #define INT_ENABLE_ADDR 0xFC |
24 | #define INT_ENABLE 0x10 |
25 | #define INT_DISABLE 0x0 |
26 | |
27 | #define INT_MASK_ADDR 0x2E |
28 | #define INT_MASK_ALL 0x3F |
29 | |
30 | #define INTA_DRVR_ADDR 0xFE |
31 | #define INTA_ENABLED_FLAG 0x08 |
32 | #define INTA_FLAG 0x01 |
33 | |
34 | #define MAILBOX 0x0F |
35 | |
36 | static struct pci_device_id ids[] = { |
37 | { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, |
38 | { 0, } |
39 | }; |
40 | MODULE_DEVICE_TABLE(pci, ids); |
41 | |
42 | static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info) |
43 | { |
44 | void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR; |
45 | unsigned char status = ioread8(int_flag); |
46 | |
47 | |
48 | if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) { |
49 | /* application writes 0x00 to 0x2F to get next interrupt */ |
50 | status = ioread8(dev_info->priv + MAILBOX); |
51 | return IRQ_HANDLED; |
52 | } |
53 | |
54 | return IRQ_NONE; |
55 | } |
56 | |
57 | static void print_board_data(struct pci_dev *pdev, struct uio_info *i) |
58 | { |
59 | dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x" |
60 | " revision: %c%c\n" , |
61 | ioread8(i->priv + 0x01), |
62 | ioread8(i->priv + 0x00), |
63 | ioread8(i->priv + 0x03), |
64 | ioread8(i->priv + 0x02), |
65 | ioread8(i->priv + 0x06), |
66 | ioread8(i->priv + 0x07)); |
67 | } |
68 | |
69 | static int probe(struct pci_dev *pdev, const struct pci_device_id *id) |
70 | { |
71 | struct uio_info *info; |
72 | int ret; |
73 | |
74 | info = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct uio_info), GFP_KERNEL); |
75 | if (!info) |
76 | return -ENOMEM; |
77 | |
78 | if (pci_enable_device(dev: pdev)) |
79 | return -ENODEV; |
80 | |
81 | if (pci_request_regions(pdev, "aectc" )) |
82 | goto out_disable; |
83 | |
84 | info->name = "aectc" ; |
85 | info->port[0].start = pci_resource_start(pdev, 0); |
86 | if (!info->port[0].start) |
87 | goto out_release; |
88 | info->priv = pci_iomap(dev: pdev, bar: 0, max: 0); |
89 | if (!info->priv) |
90 | goto out_release; |
91 | info->port[0].size = pci_resource_len(pdev, 0); |
92 | info->port[0].porttype = UIO_PORT_GPIO; |
93 | |
94 | info->version = "0.0.1" ; |
95 | info->irq = pdev->irq; |
96 | info->irq_flags = IRQF_SHARED; |
97 | info->handler = aectc_irq; |
98 | |
99 | print_board_data(pdev, i: info); |
100 | ret = uio_register_device(&pdev->dev, info); |
101 | if (ret) |
102 | goto out_unmap; |
103 | |
104 | iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR); |
105 | iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR); |
106 | if (!(ioread8(info->priv + INTA_DRVR_ADDR) |
107 | & INTA_ENABLED_FLAG)) |
108 | dev_err(&pdev->dev, "aectc: interrupts not enabled\n" ); |
109 | |
110 | pci_set_drvdata(pdev, data: info); |
111 | |
112 | return 0; |
113 | |
114 | out_unmap: |
115 | pci_iounmap(dev: pdev, info->priv); |
116 | out_release: |
117 | pci_release_regions(pdev); |
118 | out_disable: |
119 | pci_disable_device(dev: pdev); |
120 | return -ENODEV; |
121 | } |
122 | |
123 | static void remove(struct pci_dev *pdev) |
124 | { |
125 | struct uio_info *info = pci_get_drvdata(pdev); |
126 | |
127 | /* disable interrupts */ |
128 | iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR); |
129 | iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR); |
130 | /* read mailbox to ensure board drops irq */ |
131 | ioread8(info->priv + MAILBOX); |
132 | |
133 | uio_unregister_device(info); |
134 | pci_release_regions(pdev); |
135 | pci_disable_device(dev: pdev); |
136 | pci_iounmap(dev: pdev, info->priv); |
137 | } |
138 | |
139 | static struct pci_driver pci_driver = { |
140 | .name = "aectc" , |
141 | .id_table = ids, |
142 | .probe = probe, |
143 | .remove = remove, |
144 | }; |
145 | |
146 | module_pci_driver(pci_driver); |
147 | MODULE_LICENSE("GPL" ); |
148 | |