1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIO driver for the ACCES 104-IDIO-16 family
4 * Copyright (C) 2015 William Breathitt Gray
5 *
6 * This driver supports the following ACCES devices: 104-IDIO-16,
7 * 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
8 */
9#include <linux/bits.h>
10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/ioport.h>
13#include <linux/irq.h>
14#include <linux/isa.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/regmap.h>
19#include <linux/types.h>
20
21#include "gpio-idio-16.h"
22
23#define IDIO_16_EXTENT 8
24#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
25
26static unsigned int base[MAX_NUM_IDIO_16];
27static unsigned int num_idio_16;
28module_param_hw_array(base, uint, ioport, &num_idio_16, 0);
29MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
30
31static unsigned int irq[MAX_NUM_IDIO_16];
32static unsigned int num_irq;
33module_param_hw_array(irq, uint, irq, &num_irq, 0);
34MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
35
36static const struct regmap_range idio_16_wr_ranges[] = {
37	regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x4),
38};
39static const struct regmap_range idio_16_rd_ranges[] = {
40	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),
41};
42static const struct regmap_range idio_16_precious_ranges[] = {
43	regmap_reg_range(0x2, 0x2),
44};
45static const struct regmap_access_table idio_16_wr_table = {
46	.yes_ranges = idio_16_wr_ranges,
47	.n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),
48};
49static const struct regmap_access_table idio_16_rd_table = {
50	.yes_ranges = idio_16_rd_ranges,
51	.n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),
52};
53static const struct regmap_access_table idio_16_precious_table = {
54	.yes_ranges = idio_16_precious_ranges,
55	.n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),
56};
57static const struct regmap_config idio_16_regmap_config = {
58	.reg_bits = 8,
59	.reg_stride = 1,
60	.val_bits = 8,
61	.io_port = true,
62	.wr_table = &idio_16_wr_table,
63	.rd_table = &idio_16_rd_table,
64	.volatile_table = &idio_16_rd_table,
65	.precious_table = &idio_16_precious_table,
66	.cache_type = REGCACHE_FLAT,
67	.use_raw_spinlock = true,
68};
69
70/* Only input lines (GPIO 16-31) support interrupts */
71#define IDIO_16_REGMAP_IRQ(_id)						\
72	[16 + _id] = {							\
73		.mask = BIT(_id),					\
74		.type = { .types_supported = IRQ_TYPE_EDGE_BOTH },	\
75	}
76
77static const struct regmap_irq idio_16_regmap_irqs[] = {
78	IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */
79	IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */
80	IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */
81	IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */
82	IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */
83	IDIO_16_REGMAP_IRQ(15), /* 15 */
84};
85
86static int idio_16_probe(struct device *dev, unsigned int id)
87{
88	const char *const name = dev_name(dev);
89	struct idio_16_regmap_config config = {};
90	void __iomem *regs;
91	struct regmap *map;
92
93	if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
94		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
95			base[id], base[id] + IDIO_16_EXTENT);
96		return -EBUSY;
97	}
98
99	regs = devm_ioport_map(dev, base[id], IDIO_16_EXTENT);
100	if (!regs)
101		return -ENOMEM;
102
103	map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);
104	if (IS_ERR(map))
105		return dev_err_probe(dev, PTR_ERR(map), "Unable to initialize register map\n");
106
107	config.parent = dev;
108	config.map = map;
109	config.regmap_irqs = idio_16_regmap_irqs;
110	config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);
111	config.irq = irq[id];
112	config.no_status = true;
113
114	return devm_idio_16_regmap_register(dev, &config);
115}
116
117static struct isa_driver idio_16_driver = {
118	.probe = idio_16_probe,
119	.driver = {
120		.name = "104-idio-16"
121	},
122};
123
124module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq);
125
126MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
127MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
128MODULE_LICENSE("GPL v2");
129MODULE_IMPORT_NS(GPIO_IDIO_16);
130