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9787f5e2 TT |
1 | /* |
2 | * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | * | |
16 | * SPI access for Altera Arria10 MAX5 System Resource Chip | |
17 | * | |
18 | * Adapted from DA9052 | |
19 | */ | |
20 | ||
21 | #include <linux/mfd/altera-a10sr.h> | |
22 | #include <linux/mfd/core.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/spi/spi.h> | |
26 | ||
27 | static const struct mfd_cell altr_a10sr_subdev_info[] = { | |
28 | { | |
29 | .name = "altr_a10sr_gpio", | |
30 | .of_compatible = "altr,a10sr-gpio", | |
31 | }, | |
32 | }; | |
33 | ||
34 | static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) | |
35 | { | |
36 | switch (reg) { | |
37 | case ALTR_A10SR_VERSION_READ: | |
38 | case ALTR_A10SR_LED_REG: | |
39 | case ALTR_A10SR_PBDSW_REG: | |
40 | case ALTR_A10SR_PBDSW_IRQ_REG: | |
41 | case ALTR_A10SR_PWR_GOOD1_REG: | |
42 | case ALTR_A10SR_PWR_GOOD2_REG: | |
43 | case ALTR_A10SR_PWR_GOOD3_REG: | |
44 | case ALTR_A10SR_FMCAB_REG: | |
45 | case ALTR_A10SR_HPS_RST_REG: | |
46 | case ALTR_A10SR_USB_QSPI_REG: | |
47 | case ALTR_A10SR_SFPA_REG: | |
48 | case ALTR_A10SR_SFPB_REG: | |
49 | case ALTR_A10SR_I2C_M_REG: | |
50 | case ALTR_A10SR_WARM_RST_REG: | |
51 | case ALTR_A10SR_WR_KEY_REG: | |
52 | case ALTR_A10SR_PMBUS_REG: | |
53 | return true; | |
54 | default: | |
55 | return false; | |
56 | } | |
57 | } | |
58 | ||
59 | static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg) | |
60 | { | |
61 | switch (reg) { | |
62 | case ALTR_A10SR_LED_REG: | |
63 | case ALTR_A10SR_PBDSW_IRQ_REG: | |
64 | case ALTR_A10SR_FMCAB_REG: | |
65 | case ALTR_A10SR_HPS_RST_REG: | |
66 | case ALTR_A10SR_USB_QSPI_REG: | |
67 | case ALTR_A10SR_SFPA_REG: | |
68 | case ALTR_A10SR_SFPB_REG: | |
69 | case ALTR_A10SR_WARM_RST_REG: | |
70 | case ALTR_A10SR_WR_KEY_REG: | |
71 | case ALTR_A10SR_PMBUS_REG: | |
72 | return true; | |
73 | default: | |
74 | return false; | |
75 | } | |
76 | } | |
77 | ||
78 | static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg) | |
79 | { | |
80 | switch (reg) { | |
81 | case ALTR_A10SR_PBDSW_REG: | |
82 | case ALTR_A10SR_PBDSW_IRQ_REG: | |
83 | case ALTR_A10SR_PWR_GOOD1_REG: | |
84 | case ALTR_A10SR_PWR_GOOD2_REG: | |
85 | case ALTR_A10SR_PWR_GOOD3_REG: | |
86 | case ALTR_A10SR_HPS_RST_REG: | |
87 | case ALTR_A10SR_I2C_M_REG: | |
88 | case ALTR_A10SR_WARM_RST_REG: | |
89 | case ALTR_A10SR_WR_KEY_REG: | |
90 | case ALTR_A10SR_PMBUS_REG: | |
91 | return true; | |
92 | default: | |
93 | return false; | |
94 | } | |
95 | } | |
96 | ||
97 | const struct regmap_config altr_a10sr_regmap_config = { | |
98 | .reg_bits = 8, | |
99 | .val_bits = 8, | |
100 | ||
101 | .cache_type = REGCACHE_NONE, | |
102 | ||
103 | .use_single_rw = true, | |
104 | .read_flag_mask = 1, | |
105 | .write_flag_mask = 0, | |
106 | ||
107 | .max_register = ALTR_A10SR_WR_KEY_REG, | |
108 | .readable_reg = altr_a10sr_reg_readable, | |
109 | .writeable_reg = altr_a10sr_reg_writeable, | |
110 | .volatile_reg = altr_a10sr_reg_volatile, | |
111 | ||
112 | }; | |
113 | ||
114 | static int altr_a10sr_spi_probe(struct spi_device *spi) | |
115 | { | |
116 | int ret; | |
117 | struct altr_a10sr *a10sr; | |
118 | ||
119 | a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr), | |
120 | GFP_KERNEL); | |
121 | if (!a10sr) | |
122 | return -ENOMEM; | |
123 | ||
124 | spi->mode = SPI_MODE_3; | |
125 | spi->bits_per_word = 8; | |
126 | spi_setup(spi); | |
127 | ||
128 | a10sr->dev = &spi->dev; | |
129 | ||
130 | spi_set_drvdata(spi, a10sr); | |
131 | ||
132 | a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config); | |
133 | if (IS_ERR(a10sr->regmap)) { | |
134 | ret = PTR_ERR(a10sr->regmap); | |
135 | dev_err(&spi->dev, "Failed to allocate register map: %d\n", | |
136 | ret); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO, | |
141 | altr_a10sr_subdev_info, | |
142 | ARRAY_SIZE(altr_a10sr_subdev_info), | |
143 | NULL, 0, NULL); | |
144 | if (ret) | |
145 | dev_err(a10sr->dev, "Failed to register sub-devices: %d\n", | |
146 | ret); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | static const struct of_device_id altr_a10sr_spi_of_match[] = { | |
152 | { .compatible = "altr,a10sr" }, | |
153 | { }, | |
154 | }; | |
155 | MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match); | |
156 | ||
157 | static struct spi_driver altr_a10sr_spi_driver = { | |
158 | .probe = altr_a10sr_spi_probe, | |
159 | .driver = { | |
160 | .name = "altr_a10sr", | |
161 | .of_match_table = of_match_ptr(altr_a10sr_spi_of_match), | |
162 | }, | |
163 | }; | |
164 | ||
165 | module_spi_driver(altr_a10sr_spi_driver); | |
166 | ||
167 | MODULE_LICENSE("GPL v2"); | |
168 | MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); | |
169 | MODULE_DESCRIPTION("Altera Arria10 DevKit System Resource MFD Driver"); |