tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel MAX 10 Board Management Controller chip
4 *
5 * Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
6 */
7#include <linux/bitfield.h>
8#include <linux/init.h>
9#include <linux/mfd/core.h>
10#include <linux/mfd/intel-m10-bmc.h>
11#include <linux/module.h>
12#include <linux/mutex.h>
13#include <linux/regmap.h>
14#include <linux/spi/spi.h>
15
16enum m10bmc_type {
17 M10_N3000,
18};
19
20static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
21 { .name = "n3000bmc-hwmon" },
22 { .name = "n3000bmc-retimer" },
23 { .name = "n3000bmc-secure" },
24};
25
26static struct regmap_config intel_m10bmc_regmap_config = {
27 .reg_bits = 32,
28 .val_bits = 32,
29 .reg_stride = 4,
30 .max_register = M10BMC_MEM_END,
31};
32
33static ssize_t bmc_version_show(struct device *dev,
34 struct device_attribute *attr, char *buf)
35{
36 struct intel_m10bmc *ddata = dev_get_drvdata(dev);
37 unsigned int val;
38 int ret;
39
40 ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val);
41 if (ret)
42 return ret;
43
44 return sprintf(buf, "0x%x\n", val);
45}
46static DEVICE_ATTR_RO(bmc_version);
47
48static ssize_t bmcfw_version_show(struct device *dev,
49 struct device_attribute *attr, char *buf)
50{
51 struct intel_m10bmc *ddata = dev_get_drvdata(dev);
52 unsigned int val;
53 int ret;
54
55 ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val);
56 if (ret)
57 return ret;
58
59 return sprintf(buf, "0x%x\n", val);
60}
61static DEVICE_ATTR_RO(bmcfw_version);
62
63static ssize_t mac_address_show(struct device *dev,
64 struct device_attribute *attr, char *buf)
65{
66 struct intel_m10bmc *max10 = dev_get_drvdata(dev);
67 unsigned int macaddr_low, macaddr_high;
68 int ret;
69
70 ret = m10bmc_sys_read(max10, M10BMC_MAC_LOW, &macaddr_low);
71 if (ret)
72 return ret;
73
74 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
75 if (ret)
76 return ret;
77
78 return sysfs_emit(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n",
79 (u8)FIELD_GET(M10BMC_MAC_BYTE1, macaddr_low),
80 (u8)FIELD_GET(M10BMC_MAC_BYTE2, macaddr_low),
81 (u8)FIELD_GET(M10BMC_MAC_BYTE3, macaddr_low),
82 (u8)FIELD_GET(M10BMC_MAC_BYTE4, macaddr_low),
83 (u8)FIELD_GET(M10BMC_MAC_BYTE5, macaddr_high),
84 (u8)FIELD_GET(M10BMC_MAC_BYTE6, macaddr_high));
85}
86static DEVICE_ATTR_RO(mac_address);
87
88static ssize_t mac_count_show(struct device *dev,
89 struct device_attribute *attr, char *buf)
90{
91 struct intel_m10bmc *max10 = dev_get_drvdata(dev);
92 unsigned int macaddr_high;
93 int ret;
94
95 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
96 if (ret)
97 return ret;
98
99 return sysfs_emit(buf, "%u\n",
100 (u8)FIELD_GET(M10BMC_MAC_COUNT, macaddr_high));
101}
102static DEVICE_ATTR_RO(mac_count);
103
104static struct attribute *m10bmc_attrs[] = {
105 &dev_attr_bmc_version.attr,
106 &dev_attr_bmcfw_version.attr,
107 &dev_attr_mac_address.attr,
108 &dev_attr_mac_count.attr,
109 NULL,
110};
111ATTRIBUTE_GROUPS(m10bmc);
112
113static int check_m10bmc_version(struct intel_m10bmc *ddata)
114{
115 unsigned int v;
116 int ret;
117
118 /*
119 * This check is to filter out the very old legacy BMC versions,
120 * M10BMC_LEGACY_SYS_BASE is the offset to this old block of mmio
121 * registers. In the old BMC chips, the BMC version info is stored
122 * in this old version register (M10BMC_LEGACY_SYS_BASE +
123 * M10BMC_BUILD_VER), so its read out value would have not been
124 * LEGACY_INVALID (0xffffffff). But in new BMC chips that the
125 * driver supports, the value of this register should be
126 * LEGACY_INVALID.
127 */
128 ret = m10bmc_raw_read(ddata,
129 M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER, &v);
130 if (ret)
131 return -ENODEV;
132
133 if (v != M10BMC_VER_LEGACY_INVALID) {
134 dev_err(ddata->dev, "bad version M10BMC detected\n");
135 return -ENODEV;
136 }
137
138 return 0;
139}
140
141static int intel_m10_bmc_spi_probe(struct spi_device *spi)
142{
143 const struct spi_device_id *id = spi_get_device_id(spi);
144 struct device *dev = &spi->dev;
145 struct mfd_cell *cells;
146 struct intel_m10bmc *ddata;
147 int ret, n_cell;
148
149 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
150 if (!ddata)
151 return -ENOMEM;
152
153 ddata->dev = dev;
154
155 ddata->regmap =
156 devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
157 if (IS_ERR(ddata->regmap)) {
158 ret = PTR_ERR(ddata->regmap);
159 dev_err(dev, "Failed to allocate regmap: %d\n", ret);
160 return ret;
161 }
162
163 spi_set_drvdata(spi, ddata);
164
165 ret = check_m10bmc_version(ddata);
166 if (ret) {
167 dev_err(dev, "Failed to identify m10bmc hardware\n");
168 return ret;
169 }
170
171 switch (id->driver_data) {
172 case M10_N3000:
173 cells = m10bmc_pacn3000_subdevs;
174 n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs);
175 break;
176 default:
177 return -ENODEV;
178 }
179
180 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell,
181 NULL, 0, NULL);
182 if (ret)
183 dev_err(dev, "Failed to register sub-devices: %d\n", ret);
184
185 return ret;
186}
187
188static const struct spi_device_id m10bmc_spi_id[] = {
189 { "m10-n3000", M10_N3000 },
190 { }
191};
192MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
193
194static struct spi_driver intel_m10bmc_spi_driver = {
195 .driver = {
196 .name = "intel-m10-bmc",
197 .dev_groups = m10bmc_groups,
198 },
199 .probe = intel_m10_bmc_spi_probe,
200 .id_table = m10bmc_spi_id,
201};
202module_spi_driver(intel_m10bmc_spi_driver);
203
204MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver");
205MODULE_AUTHOR("Intel Corporation");
206MODULE_LICENSE("GPL v2");
207MODULE_ALIAS("spi:intel-m10-bmc");