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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * GPIO driver for the Diamond Systems GPIO-MM | |
4 | * Copyright (C) 2016 William Breathitt Gray | |
5 | * | |
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6 | * This driver supports the following Diamond Systems devices: GPIO-MM and |
7 | * GPIO-MM-12. | |
8 | */ | |
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9 | #include <linux/device.h> |
10 | #include <linux/errno.h> | |
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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> | |
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16 | #include <linux/regmap.h> |
17 | #include <linux/types.h> | |
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18 | |
19 | #include "gpio-i8255.h" | |
20 | ||
21 | MODULE_IMPORT_NS(I8255); | |
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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; | |
d759f906 | 28 | module_param_hw_array(base, uint, ioport, &num_gpiomm, 0); |
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29 | MODULE_PARM_DESC(base, "Diamond Systems GPIO-MM base addresses"); |
30 | ||
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31 | #define GPIOMM_NUM_PPI 2 |
32 | ||
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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, | |
6ea5dcdf | 48 | }; |
65502a12 | 49 | |
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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 | ||
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62 | static int gpiomm_probe(struct device *dev, unsigned int id) |
63 | { | |
6ea5dcdf | 64 | const char *const name = dev_name(dev); |
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65 | struct i8255_regmap_config config = {}; |
66 | void __iomem *regs; | |
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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 | ||
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74 | regs = devm_ioport_map(dev, base[id], GPIOMM_EXTENT); |
75 | if (!regs) | |
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76 | return -ENOMEM; |
77 | ||
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78 | config.map = devm_regmap_init_mmio(dev, regs, &gpiomm_regmap_config); |
79 | if (IS_ERR(config.map)) | |
80 | return dev_err_probe(dev, PTR_ERR(config.map), | |
81 | "Unable to initialize register map\n"); | |
82 | ||
83 | config.parent = dev; | |
84 | config.num_ppi = GPIOMM_NUM_PPI; | |
85 | config.names = gpiomm_names; | |
6ea5dcdf | 86 | |
1c05004f | 87 | return devm_i8255_regmap_register(dev, &config); |
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88 | } |
89 | ||
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90 | static struct isa_driver gpiomm_driver = { |
91 | .probe = gpiomm_probe, | |
92 | .driver = { | |
93 | .name = "gpio-mm" | |
94 | }, | |
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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"); |