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
18static const struct regmap_range idio_16_wr_ranges[] = {
19	regmap_reg_range(0x0, 0x2), regmap_reg_range(0x3, 0x4),
20};
21static const struct regmap_range idio_16_rd_ranges[] = {
22	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x6),
23};
24static const struct regmap_range idio_16_precious_ranges[] = {
25	regmap_reg_range(0x2, 0x2),
26};
27static 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};
31static 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};
35static 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};
39static 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
59static 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
68static 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(map))
94		return dev_err_probe(dev, PTR_ERR(map), "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);
104}
105
106static const struct pci_device_id idio_16_pci_dev_id[] = {
107	{ PCI_DEVICE(0x494F, 0x0DC8) }, { 0 }
108};
109MODULE_DEVICE_TABLE(pci, idio_16_pci_dev_id);
110
111static 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
117module_pci_driver(idio_16_driver);
118
119MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
120MODULE_DESCRIPTION("ACCES PCI-IDIO-16 GPIO driver");
121MODULE_LICENSE("GPL v2");
122MODULE_IMPORT_NS(GPIO_IDIO_16);
123