TrustedFirmware Git Browser
Code Review Sign In
review.trustedfirmware.org / hafnium / third_party / linux.git / 0f672f6c0b52b7b0700b0915c72b540721af4465 / . / drivers / mfd / altera-a10sr.c
blob: a3bf64f9afd1bc2f2f5b96cd3a9a34ff384907b0 [file] [log] [blame]
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]1// SPDX-License-Identifier: GPL-2.0-only
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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 *
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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/of.h>
18#include <linux/spi/spi.h>
19
20static const struct mfd_cell altr_a10sr_subdev_info[] = {
21 {
22 .name = "altr_a10sr_gpio",
23 .of_compatible = "altr,a10sr-gpio",
24 },
25 {
26 .name = "altr_a10sr_reset",
27 .of_compatible = "altr,a10sr-reset",
28 },
29};
30
31static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
32{
33 switch (reg) {
34 case ALTR_A10SR_VERSION_READ:
35 case ALTR_A10SR_LED_REG:
36 case ALTR_A10SR_PBDSW_REG:
37 case ALTR_A10SR_PBDSW_IRQ_REG:
38 case ALTR_A10SR_PWR_GOOD1_REG:
39 case ALTR_A10SR_PWR_GOOD2_REG:
40 case ALTR_A10SR_PWR_GOOD3_REG:
41 case ALTR_A10SR_FMCAB_REG:
42 case ALTR_A10SR_HPS_RST_REG:
43 case ALTR_A10SR_USB_QSPI_REG:
44 case ALTR_A10SR_SFPA_REG:
45 case ALTR_A10SR_SFPB_REG:
46 case ALTR_A10SR_I2C_M_REG:
47 case ALTR_A10SR_WARM_RST_REG:
48 case ALTR_A10SR_WR_KEY_REG:
49 case ALTR_A10SR_PMBUS_REG:
50 return true;
51 default:
52 return false;
53 }
54}
55
56static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
57{
58 switch (reg) {
59 case ALTR_A10SR_LED_REG:
60 case ALTR_A10SR_PBDSW_IRQ_REG:
61 case ALTR_A10SR_FMCAB_REG:
62 case ALTR_A10SR_HPS_RST_REG:
63 case ALTR_A10SR_USB_QSPI_REG:
64 case ALTR_A10SR_SFPA_REG:
65 case ALTR_A10SR_SFPB_REG:
66 case ALTR_A10SR_WARM_RST_REG:
67 case ALTR_A10SR_WR_KEY_REG:
68 case ALTR_A10SR_PMBUS_REG:
69 return true;
70 default:
71 return false;
72 }
73}
74
75static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
76{
77 switch (reg) {
78 case ALTR_A10SR_PBDSW_REG:
79 case ALTR_A10SR_PBDSW_IRQ_REG:
80 case ALTR_A10SR_PWR_GOOD1_REG:
81 case ALTR_A10SR_PWR_GOOD2_REG:
82 case ALTR_A10SR_PWR_GOOD3_REG:
83 case ALTR_A10SR_HPS_RST_REG:
84 case ALTR_A10SR_I2C_M_REG:
85 case ALTR_A10SR_WARM_RST_REG:
86 case ALTR_A10SR_WR_KEY_REG:
87 case ALTR_A10SR_PMBUS_REG:
88 return true;
89 default:
90 return false;
91 }
92}
93
94static const struct regmap_config altr_a10sr_regmap_config = {
95 .reg_bits = 8,
96 .val_bits = 8,
97
98 .cache_type = REGCACHE_NONE,
99
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]100 .use_single_read = true,
101 .use_single_write = true,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]102 .read_flag_mask = 1,
103 .write_flag_mask = 0,
104
105 .max_register = ALTR_A10SR_WR_KEY_REG,
106 .readable_reg = altr_a10sr_reg_readable,
107 .writeable_reg = altr_a10sr_reg_writeable,
108 .volatile_reg = altr_a10sr_reg_volatile,
109
110};
111
112static int altr_a10sr_spi_probe(struct spi_device *spi)
113{
114 int ret;
115 struct altr_a10sr *a10sr;
116
117 a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
118 GFP_KERNEL);
119 if (!a10sr)
120 return -ENOMEM;
121
122 spi->mode = SPI_MODE_3;
123 spi->bits_per_word = 8;
124 spi_setup(spi);
125
126 a10sr->dev = &spi->dev;
127
128 spi_set_drvdata(spi, a10sr);
129
130 a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
131 if (IS_ERR(a10sr->regmap)) {
132 ret = PTR_ERR(a10sr->regmap);
133 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
134 ret);
135 return ret;
136 }
137
138 ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
139 altr_a10sr_subdev_info,
140 ARRAY_SIZE(altr_a10sr_subdev_info),
141 NULL, 0, NULL);
142 if (ret)
143 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
144 ret);
145
146 return ret;
147}
148
149static const struct of_device_id altr_a10sr_spi_of_match[] = {
150 { .compatible = "altr,a10sr" },
151 { },
152};
153
154static struct spi_driver altr_a10sr_spi_driver = {
155 .probe = altr_a10sr_spi_probe,
156 .driver = {
157 .name = "altr_a10sr",
158 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
159 },
160};
161builtin_driver(altr_a10sr_spi_driver, spi_register_driver)