1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * GPIO driver for the ACCES PCI-IDIO-16 |
4 | * Copyright (C) 2017 William Breathitt Gray |
5 | */ |
6 | #include <linux/bits.h> |
7 | #include <linux/device.h> |
8 | #include <linux/err.h> |
9 | #include <linux/irq.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/pci.h> |
13 | #include <linux/regmap.h> |
14 | #include <linux/types.h> |
15 | |
16 | #include "gpio-idio-16.h" |
17 | |
18 | static const struct regmap_range idio_16_wr_ranges[] = { |
19 | regmap_reg_range(0x0, 0x2), regmap_reg_range(0x3, 0x4), |
20 | }; |
21 | static const struct regmap_range idio_16_rd_ranges[] = { |
22 | regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x6), |
23 | }; |
24 | static const struct regmap_range idio_16_precious_ranges[] = { |
25 | regmap_reg_range(0x2, 0x2), |
26 | }; |
27 | static const struct regmap_access_table idio_16_wr_table = { |
28 | .yes_ranges = idio_16_wr_ranges, |
29 | .n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges), |
30 | }; |
31 | static const struct regmap_access_table idio_16_rd_table = { |
32 | .yes_ranges = idio_16_rd_ranges, |
33 | .n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges), |
34 | }; |
35 | static const struct regmap_access_table idio_16_precious_table = { |
36 | .yes_ranges = idio_16_precious_ranges, |
37 | .n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges), |
38 | }; |
39 | static const struct regmap_config idio_16_regmap_config = { |
40 | .reg_bits = 8, |
41 | .reg_stride = 1, |
42 | .val_bits = 8, |
43 | .io_port = true, |
44 | .wr_table = &idio_16_wr_table, |
45 | .rd_table = &idio_16_rd_table, |
46 | .volatile_table = &idio_16_rd_table, |
47 | .precious_table = &idio_16_precious_table, |
48 | .cache_type = REGCACHE_FLAT, |
49 | .use_raw_spinlock = true, |
50 | }; |
51 | |
52 | /* Only input lines (GPIO 16-31) support interrupts */ |
53 | #define IDIO_16_REGMAP_IRQ(_id) \ |
54 | [16 + _id] = { \ |
55 | .mask = BIT(2), \ |
56 | .type = { .types_supported = IRQ_TYPE_EDGE_BOTH }, \ |
57 | } |
58 | |
59 | static const struct regmap_irq idio_16_regmap_irqs[] = { |
60 | IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */ |
61 | IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */ |
62 | IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */ |
63 | IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */ |
64 | IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */ |
65 | IDIO_16_REGMAP_IRQ(15), /* 15 */ |
66 | }; |
67 | |
68 | static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
69 | { |
70 | struct device *const dev = &pdev->dev; |
71 | int err; |
72 | const size_t pci_bar_index = 2; |
73 | const char *const name = pci_name(pdev); |
74 | struct idio_16_regmap_config config = {}; |
75 | void __iomem *regs; |
76 | struct regmap *map; |
77 | |
78 | err = pcim_enable_device(pdev); |
79 | if (err) { |
80 | dev_err(dev, "Failed to enable PCI device (%d)\n" , err); |
81 | return err; |
82 | } |
83 | |
84 | err = pcim_iomap_regions(pdev, BIT(pci_bar_index), name); |
85 | if (err) { |
86 | dev_err(dev, "Unable to map PCI I/O addresses (%d)\n" , err); |
87 | return err; |
88 | } |
89 | |
90 | regs = pcim_iomap_table(pdev)[pci_bar_index]; |
91 | |
92 | map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config); |
93 | if (IS_ERR(ptr: map)) |
94 | return dev_err_probe(dev, err: PTR_ERR(ptr: map), fmt: "Unable to initialize register map\n" ); |
95 | |
96 | config.parent = dev; |
97 | config.map = map; |
98 | config.regmap_irqs = idio_16_regmap_irqs; |
99 | config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs); |
100 | config.irq = pdev->irq; |
101 | config.filters = true; |
102 | |
103 | return devm_idio_16_regmap_register(dev, config: &config); |
104 | } |
105 | |
106 | static const struct pci_device_id idio_16_pci_dev_id[] = { |
107 | { PCI_DEVICE(0x494F, 0x0DC8) }, { 0 } |
108 | }; |
109 | MODULE_DEVICE_TABLE(pci, idio_16_pci_dev_id); |
110 | |
111 | static struct pci_driver idio_16_driver = { |
112 | .name = "pci-idio-16" , |
113 | .id_table = idio_16_pci_dev_id, |
114 | .probe = idio_16_probe |
115 | }; |
116 | |
117 | module_pci_driver(idio_16_driver); |
118 | |
119 | MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>" ); |
120 | MODULE_DESCRIPTION("ACCES PCI-IDIO-16 GPIO driver" ); |
121 | MODULE_LICENSE("GPL v2" ); |
122 | MODULE_IMPORT_NS(GPIO_IDIO_16); |
123 | |