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
altr_a10sr_reg_readable(struct device * dev,unsigned int reg)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
altr_a10sr_reg_writeable(struct device * dev,unsigned int reg)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
altr_a10sr_reg_volatile(struct device * dev,unsigned int reg)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
altr_a10sr_spi_probe(struct spi_device * spi)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 = altr_a10sr_spi_of_match,
167 },
168 .id_table = altr_a10sr_spi_ids,
169 };
170 builtin_driver(altr_a10sr_spi_driver, spi_register_driver)
171
