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gerrit-public.fairphone.software / kernel / msm-4.9 / 9c296b46c67ed323538bca80a8be1f0b10e570a0 / . / drivers / mfd / altera-a10sr.c
blob: c05aa4ff57fda3611284bd1ce9dafdffb3d0d68a [file] [log] [blame]
Thor Thayer9787f5e2016-06-02 12:52:23 -0500[diff] [blame]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
27static const struct mfd_cell altr_a10sr_subdev_info[] = {
28 {
29 .name = "altr_a10sr_gpio",
30 .of_compatible = "altr,a10sr-gpio",
31 },
32};
33
34static 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
59static 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
78static 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
97const 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
114static 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
151static const struct of_device_id altr_a10sr_spi_of_match[] = {
152 { .compatible = "altr,a10sr" },
153 { },
154};
155MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);
156
157static 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
165module_spi_driver(altr_a10sr_spi_driver);
166
167MODULE_LICENSE("GPL v2");
168MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
169MODULE_DESCRIPTION("Altera Arria10 DevKit System Resource MFD Driver");