1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * GPIO driver for the Diamond Systems GPIO-MM |
4 | * Copyright (C) 2016 William Breathitt Gray |
5 | * |
6 | * This driver supports the following Diamond Systems devices: GPIO-MM and |
7 | * GPIO-MM-12. |
8 | */ |
9 | #include <linux/device.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/ioport.h> |
12 | #include <linux/isa.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> |
15 | #include <linux/moduleparam.h> |
16 | #include <linux/regmap.h> |
17 | #include <linux/types.h> |
18 | |
19 | #include "gpio-i8255.h" |
20 | |
21 | MODULE_IMPORT_NS(I8255); |
22 | |
23 | #define GPIOMM_EXTENT 8 |
24 | #define MAX_NUM_GPIOMM max_num_isa_dev(GPIOMM_EXTENT) |
25 | |
26 | static unsigned int base[MAX_NUM_GPIOMM]; |
27 | static unsigned int num_gpiomm; |
28 | module_param_hw_array(base, uint, ioport, &num_gpiomm, 0); |
29 | MODULE_PARM_DESC(base, "Diamond Systems GPIO-MM base addresses" ); |
30 | |
31 | #define GPIOMM_NUM_PPI 2 |
32 | |
33 | static const struct regmap_range gpiomm_volatile_ranges[] = { |
34 | i8255_volatile_regmap_range(0x0), i8255_volatile_regmap_range(0x4), |
35 | }; |
36 | static const struct regmap_access_table gpiomm_volatile_table = { |
37 | .yes_ranges = gpiomm_volatile_ranges, |
38 | .n_yes_ranges = ARRAY_SIZE(gpiomm_volatile_ranges), |
39 | }; |
40 | static const struct regmap_config gpiomm_regmap_config = { |
41 | .reg_bits = 8, |
42 | .reg_stride = 1, |
43 | .val_bits = 8, |
44 | .io_port = true, |
45 | .max_register = 0x7, |
46 | .volatile_table = &gpiomm_volatile_table, |
47 | .cache_type = REGCACHE_FLAT, |
48 | }; |
49 | |
50 | #define GPIOMM_NGPIO 48 |
51 | static const char *gpiomm_names[GPIOMM_NGPIO] = { |
52 | "Port 1A0" , "Port 1A1" , "Port 1A2" , "Port 1A3" , "Port 1A4" , "Port 1A5" , |
53 | "Port 1A6" , "Port 1A7" , "Port 1B0" , "Port 1B1" , "Port 1B2" , "Port 1B3" , |
54 | "Port 1B4" , "Port 1B5" , "Port 1B6" , "Port 1B7" , "Port 1C0" , "Port 1C1" , |
55 | "Port 1C2" , "Port 1C3" , "Port 1C4" , "Port 1C5" , "Port 1C6" , "Port 1C7" , |
56 | "Port 2A0" , "Port 2A1" , "Port 2A2" , "Port 2A3" , "Port 2A4" , "Port 2A5" , |
57 | "Port 2A6" , "Port 2A7" , "Port 2B0" , "Port 2B1" , "Port 2B2" , "Port 2B3" , |
58 | "Port 2B4" , "Port 2B5" , "Port 2B6" , "Port 2B7" , "Port 2C0" , "Port 2C1" , |
59 | "Port 2C2" , "Port 2C3" , "Port 2C4" , "Port 2C5" , "Port 2C6" , "Port 2C7" , |
60 | }; |
61 | |
62 | static int gpiomm_probe(struct device *dev, unsigned int id) |
63 | { |
64 | const char *const name = dev_name(dev); |
65 | struct i8255_regmap_config config = {}; |
66 | void __iomem *regs; |
67 | |
68 | if (!devm_request_region(dev, base[id], GPIOMM_EXTENT, name)) { |
69 | dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n" , |
70 | base[id], base[id] + GPIOMM_EXTENT); |
71 | return -EBUSY; |
72 | } |
73 | |
74 | regs = devm_ioport_map(dev, port: base[id], GPIOMM_EXTENT); |
75 | if (!regs) |
76 | return -ENOMEM; |
77 | |
78 | config.map = devm_regmap_init_mmio(dev, regs, &gpiomm_regmap_config); |
79 | if (IS_ERR(ptr: config.map)) |
80 | return dev_err_probe(dev, err: PTR_ERR(ptr: config.map), |
81 | fmt: "Unable to initialize register map\n" ); |
82 | |
83 | config.parent = dev; |
84 | config.num_ppi = GPIOMM_NUM_PPI; |
85 | config.names = gpiomm_names; |
86 | |
87 | return devm_i8255_regmap_register(dev, config: &config); |
88 | } |
89 | |
90 | static struct isa_driver gpiomm_driver = { |
91 | .probe = gpiomm_probe, |
92 | .driver = { |
93 | .name = "gpio-mm" |
94 | }, |
95 | }; |
96 | |
97 | module_isa_driver(gpiomm_driver, num_gpiomm); |
98 | |
99 | MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>" ); |
100 | MODULE_DESCRIPTION("Diamond Systems GPIO-MM GPIO driver" ); |
101 | MODULE_LICENSE("GPL v2" ); |
102 | |