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
26 static unsigned int base[MAX_NUM_IDIO_16];
27 static unsigned int num_idio_16;
28 module_param_hw_array(base, uint, ioport, &num_idio_16, 0);
29 MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
30
31 static unsigned int irq[MAX_NUM_IDIO_16];
32 static unsigned int num_irq;
33 module_param_hw_array(irq, uint, irq, &num_irq, 0);
34 MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
35
36 static const struct regmap_range idio_16_wr_ranges[] = {
37 regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x4),
38 };
39 static const struct regmap_range idio_16_rd_ranges[] = {
40 regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),
41 };
42 static const struct regmap_range idio_16_precious_ranges[] = {
43 regmap_reg_range(0x2, 0x2),
44 };
45 static 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 };
49 static 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 };
53 static 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 };
57 static 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
77 static 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
idio_16_probe(struct device * dev,unsigned int id)86 static 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
117 static struct isa_driver idio_16_driver = {
118 .probe = idio_16_probe,
119 .driver = {
120 .name = "104-idio-16"
121 },
122 };
123
124 module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq);
125
126 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
127 MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
128 MODULE_LICENSE("GPL v2");
129 MODULE_IMPORT_NS(GPIO_IDIO_16);
130