1 /*
2 * Altera Arria10 DevKit System Resource MFD Driver
3 *
4 * Author: Thor Thayer <tthayer@opensource.altera.com>
5 *
6 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program. If not, see <http://www.gnu.org/licenses/>.
19 *
20 * SPI access for Altera Arria10 MAX5 System Resource Chip
21 *
22 * Adapted from DA9052
23 */
24
25 #include <linux/mfd/altera-a10sr.h>
26 #include <linux/mfd/core.h>
27 #include <linux/init.h>
28 #include <linux/of.h>
29 #include <linux/spi/spi.h>
30
31 static const struct mfd_cell altr_a10sr_subdev_info[] = {
32 {
33 .name = "altr_a10sr_gpio",
34 .of_compatible = "altr,a10sr-gpio",
35 },
36 {
37 .name = "altr_a10sr_reset",
38 .of_compatible = "altr,a10sr-reset",
39 },
40 };
41
altr_a10sr_reg_readable(struct device * dev,unsigned int reg)42 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
43 {
44 switch (reg) {
45 case ALTR_A10SR_VERSION_READ:
46 case ALTR_A10SR_LED_REG:
47 case ALTR_A10SR_PBDSW_REG:
48 case ALTR_A10SR_PBDSW_IRQ_REG:
49 case ALTR_A10SR_PWR_GOOD1_REG:
50 case ALTR_A10SR_PWR_GOOD2_REG:
51 case ALTR_A10SR_PWR_GOOD3_REG:
52 case ALTR_A10SR_FMCAB_REG:
53 case ALTR_A10SR_HPS_RST_REG:
54 case ALTR_A10SR_USB_QSPI_REG:
55 case ALTR_A10SR_SFPA_REG:
56 case ALTR_A10SR_SFPB_REG:
57 case ALTR_A10SR_I2C_M_REG:
58 case ALTR_A10SR_WARM_RST_REG:
59 case ALTR_A10SR_WR_KEY_REG:
60 case ALTR_A10SR_PMBUS_REG:
61 return true;
62 default:
63 return false;
64 }
65 }
66
altr_a10sr_reg_writeable(struct device * dev,unsigned int reg)67 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
68 {
69 switch (reg) {
70 case ALTR_A10SR_LED_REG:
71 case ALTR_A10SR_PBDSW_IRQ_REG:
72 case ALTR_A10SR_FMCAB_REG:
73 case ALTR_A10SR_HPS_RST_REG:
74 case ALTR_A10SR_USB_QSPI_REG:
75 case ALTR_A10SR_SFPA_REG:
76 case ALTR_A10SR_SFPB_REG:
77 case ALTR_A10SR_WARM_RST_REG:
78 case ALTR_A10SR_WR_KEY_REG:
79 case ALTR_A10SR_PMBUS_REG:
80 return true;
81 default:
82 return false;
83 }
84 }
85
altr_a10sr_reg_volatile(struct device * dev,unsigned int reg)86 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
87 {
88 switch (reg) {
89 case ALTR_A10SR_PBDSW_REG:
90 case ALTR_A10SR_PBDSW_IRQ_REG:
91 case ALTR_A10SR_PWR_GOOD1_REG:
92 case ALTR_A10SR_PWR_GOOD2_REG:
93 case ALTR_A10SR_PWR_GOOD3_REG:
94 case ALTR_A10SR_HPS_RST_REG:
95 case ALTR_A10SR_I2C_M_REG:
96 case ALTR_A10SR_WARM_RST_REG:
97 case ALTR_A10SR_WR_KEY_REG:
98 case ALTR_A10SR_PMBUS_REG:
99 return true;
100 default:
101 return false;
102 }
103 }
104
105 static const struct regmap_config altr_a10sr_regmap_config = {
106 .reg_bits = 8,
107 .val_bits = 8,
108
109 .cache_type = REGCACHE_NONE,
110
111 .use_single_rw = true,
112 .read_flag_mask = 1,
113 .write_flag_mask = 0,
114
115 .max_register = ALTR_A10SR_WR_KEY_REG,
116 .readable_reg = altr_a10sr_reg_readable,
117 .writeable_reg = altr_a10sr_reg_writeable,
118 .volatile_reg = altr_a10sr_reg_volatile,
119
120 };
121
altr_a10sr_spi_probe(struct spi_device * spi)122 static int altr_a10sr_spi_probe(struct spi_device *spi)
123 {
124 int ret;
125 struct altr_a10sr *a10sr;
126
127 a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
128 GFP_KERNEL);
129 if (!a10sr)
130 return -ENOMEM;
131
132 spi->mode = SPI_MODE_3;
133 spi->bits_per_word = 8;
134 spi_setup(spi);
135
136 a10sr->dev = &spi->dev;
137
138 spi_set_drvdata(spi, a10sr);
139
140 a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
141 if (IS_ERR(a10sr->regmap)) {
142 ret = PTR_ERR(a10sr->regmap);
143 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
144 ret);
145 return ret;
146 }
147
148 ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
149 altr_a10sr_subdev_info,
150 ARRAY_SIZE(altr_a10sr_subdev_info),
151 NULL, 0, NULL);
152 if (ret)
153 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
154 ret);
155
156 return ret;
157 }
158
159 static const struct of_device_id altr_a10sr_spi_of_match[] = {
160 { .compatible = "altr,a10sr" },
161 { },
162 };
163
164 static struct spi_driver altr_a10sr_spi_driver = {
165 .probe = altr_a10sr_spi_probe,
166 .driver = {
167 .name = "altr_a10sr",
168 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
169 },
170 };
171 builtin_driver(altr_a10sr_spi_driver, spi_register_driver)
172
