GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / altera-a10sr.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Altera Arria10 DevKit System Resource MFD Driver
4  *
5  * Author: Thor Thayer <tthayer@opensource.altera.com>
6  *
7  * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
8  *
9  * SPI access for Altera Arria10 MAX5 System Resource Chip
10  *
11  * Adapted from DA9052
12  */
13
14 #include <linux/mfd/altera-a10sr.h>
15 #include <linux/mfd/core.h>
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/spi/spi.h>
20
21 static const struct mfd_cell altr_a10sr_subdev_info[] = {
22         {
23                 .name = "altr_a10sr_gpio",
24                 .of_compatible = "altr,a10sr-gpio",
25         },
26         {
27                 .name = "altr_a10sr_reset",
28                 .of_compatible = "altr,a10sr-reset",
29         },
30 };
31
32 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
33 {
34         switch (reg) {
35         case ALTR_A10SR_VERSION_READ:
36         case ALTR_A10SR_LED_REG:
37         case ALTR_A10SR_PBDSW_REG:
38         case ALTR_A10SR_PBDSW_IRQ_REG:
39         case ALTR_A10SR_PWR_GOOD1_REG:
40         case ALTR_A10SR_PWR_GOOD2_REG:
41         case ALTR_A10SR_PWR_GOOD3_REG:
42         case ALTR_A10SR_FMCAB_REG:
43         case ALTR_A10SR_HPS_RST_REG:
44         case ALTR_A10SR_USB_QSPI_REG:
45         case ALTR_A10SR_SFPA_REG:
46         case ALTR_A10SR_SFPB_REG:
47         case ALTR_A10SR_I2C_M_REG:
48         case ALTR_A10SR_WARM_RST_REG:
49         case ALTR_A10SR_WR_KEY_REG:
50         case ALTR_A10SR_PMBUS_REG:
51                 return true;
52         default:
53                 return false;
54         }
55 }
56
57 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
58 {
59         switch (reg) {
60         case ALTR_A10SR_LED_REG:
61         case ALTR_A10SR_PBDSW_IRQ_REG:
62         case ALTR_A10SR_FMCAB_REG:
63         case ALTR_A10SR_HPS_RST_REG:
64         case ALTR_A10SR_USB_QSPI_REG:
65         case ALTR_A10SR_SFPA_REG:
66         case ALTR_A10SR_SFPB_REG:
67         case ALTR_A10SR_WARM_RST_REG:
68         case ALTR_A10SR_WR_KEY_REG:
69         case ALTR_A10SR_PMBUS_REG:
70                 return true;
71         default:
72                 return false;
73         }
74 }
75
76 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
77 {
78         switch (reg) {
79         case ALTR_A10SR_PBDSW_REG:
80         case ALTR_A10SR_PBDSW_IRQ_REG:
81         case ALTR_A10SR_PWR_GOOD1_REG:
82         case ALTR_A10SR_PWR_GOOD2_REG:
83         case ALTR_A10SR_PWR_GOOD3_REG:
84         case ALTR_A10SR_HPS_RST_REG:
85         case ALTR_A10SR_I2C_M_REG:
86         case ALTR_A10SR_WARM_RST_REG:
87         case ALTR_A10SR_WR_KEY_REG:
88         case ALTR_A10SR_PMBUS_REG:
89                 return true;
90         default:
91                 return false;
92         }
93 }
94
95 static const struct regmap_config altr_a10sr_regmap_config = {
96         .reg_bits = 8,
97         .val_bits = 8,
98
99         .cache_type = REGCACHE_NONE,
100
101         .use_single_read = true,
102         .use_single_write = true,
103         .read_flag_mask = 1,
104         .write_flag_mask = 0,
105
106         .max_register = ALTR_A10SR_WR_KEY_REG,
107         .readable_reg = altr_a10sr_reg_readable,
108         .writeable_reg = altr_a10sr_reg_writeable,
109         .volatile_reg = altr_a10sr_reg_volatile,
110
111 };
112
113 static int altr_a10sr_spi_probe(struct spi_device *spi)
114 {
115         int ret;
116         struct altr_a10sr *a10sr;
117
118         a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
119                              GFP_KERNEL);
120         if (!a10sr)
121                 return -ENOMEM;
122
123         spi->mode = SPI_MODE_3;
124         spi->bits_per_word = 8;
125         spi_setup(spi);
126
127         a10sr->dev = &spi->dev;
128
129         spi_set_drvdata(spi, a10sr);
130
131         a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
132         if (IS_ERR(a10sr->regmap)) {
133                 ret = PTR_ERR(a10sr->regmap);
134                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
135                         ret);
136                 return ret;
137         }
138
139         ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
140                                    altr_a10sr_subdev_info,
141                                    ARRAY_SIZE(altr_a10sr_subdev_info),
142                                    NULL, 0, NULL);
143         if (ret)
144                 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
145                         ret);
146
147         return ret;
148 }
149
150 static const struct of_device_id altr_a10sr_spi_of_match[] = {
151         { .compatible = "altr,a10sr" },
152         { },
153 };
154 MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);
155
156 static const struct spi_device_id altr_a10sr_spi_ids[] = {
157         { .name = "a10sr" },
158         { },
159 };
160 MODULE_DEVICE_TABLE(spi, altr_a10sr_spi_ids);
161
162 static struct spi_driver altr_a10sr_spi_driver = {
163         .probe = altr_a10sr_spi_probe,
164         .driver = {
165                 .name = "altr_a10sr",
166                 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
167         },
168         .id_table = altr_a10sr_spi_ids,
169 };
170 builtin_driver(altr_a10sr_spi_driver, spi_register_driver)