tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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 M10_D5005
19};
20
21static struct mfd_cell m10bmc_d5005_subdevs[] = {
22 { .name = "d5005bmc-hwmon" },
23};
24
25static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
26 { .name = "n3000bmc-hwmon" },
27 { .name = "n3000bmc-retimer" },
28 { .name = "n3000bmc-secure" },
29};
30
31static const struct regmap_range m10bmc_regmap_range[] = {
32 regmap_reg_range(M10BMC_LEGACY_BUILD_VER, M10BMC_LEGACY_BUILD_VER),
33 regmap_reg_range(M10BMC_SYS_BASE, M10BMC_SYS_END),
34 regmap_reg_range(M10BMC_FLASH_BASE, M10BMC_FLASH_END),
35};
36
37static const struct regmap_access_table m10bmc_access_table = {
38 .yes_ranges = m10bmc_regmap_range,
39 .n_yes_ranges = ARRAY_SIZE(m10bmc_regmap_range),
40};
41
42static struct regmap_config intel_m10bmc_regmap_config = {
43 .reg_bits = 32,
44 .val_bits = 32,
45 .reg_stride = 4,
46 .wr_table = &m10bmc_access_table,
47 .rd_table = &m10bmc_access_table,
48 .max_register = M10BMC_MEM_END,
49};
50
51static ssize_t bmc_version_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
53{
54 struct intel_m10bmc *ddata = dev_get_drvdata(dev);
55 unsigned int val;
56 int ret;
57
58 ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val);
59 if (ret)
60 return ret;
61
62 return sprintf(buf, "0x%x\n", val);
63}
64static DEVICE_ATTR_RO(bmc_version);
65
66static ssize_t bmcfw_version_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
68{
69 struct intel_m10bmc *ddata = dev_get_drvdata(dev);
70 unsigned int val;
71 int ret;
72
73 ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val);
74 if (ret)
75 return ret;
76
77 return sprintf(buf, "0x%x\n", val);
78}
79static DEVICE_ATTR_RO(bmcfw_version);
80
81static ssize_t mac_address_show(struct device *dev,
82 struct device_attribute *attr, char *buf)
83{
84 struct intel_m10bmc *max10 = dev_get_drvdata(dev);
85 unsigned int macaddr_low, macaddr_high;
86 int ret;
87
88 ret = m10bmc_sys_read(max10, M10BMC_MAC_LOW, &macaddr_low);
89 if (ret)
90 return ret;
91
92 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
93 if (ret)
94 return ret;
95
96 return sysfs_emit(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n",
97 (u8)FIELD_GET(M10BMC_MAC_BYTE1, macaddr_low),
98 (u8)FIELD_GET(M10BMC_MAC_BYTE2, macaddr_low),
99 (u8)FIELD_GET(M10BMC_MAC_BYTE3, macaddr_low),
100 (u8)FIELD_GET(M10BMC_MAC_BYTE4, macaddr_low),
101 (u8)FIELD_GET(M10BMC_MAC_BYTE5, macaddr_high),
102 (u8)FIELD_GET(M10BMC_MAC_BYTE6, macaddr_high));
103}
104static DEVICE_ATTR_RO(mac_address);
105
106static ssize_t mac_count_show(struct device *dev,
107 struct device_attribute *attr, char *buf)
108{
109 struct intel_m10bmc *max10 = dev_get_drvdata(dev);
110 unsigned int macaddr_high;
111 int ret;
112
113 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
114 if (ret)
115 return ret;
116
117 return sysfs_emit(buf, "%u\n",
118 (u8)FIELD_GET(M10BMC_MAC_COUNT, macaddr_high));
119}
120static DEVICE_ATTR_RO(mac_count);
121
122static struct attribute *m10bmc_attrs[] = {
123 &dev_attr_bmc_version.attr,
124 &dev_attr_bmcfw_version.attr,
125 &dev_attr_mac_address.attr,
126 &dev_attr_mac_count.attr,
127 NULL,
128};
129ATTRIBUTE_GROUPS(m10bmc);
130
131static int check_m10bmc_version(struct intel_m10bmc *ddata)
132{
133 unsigned int v;
134 int ret;
135
136 /*
137 * This check is to filter out the very old legacy BMC versions. In the
138 * old BMC chips, the BMC version info is stored in the old version
139 * register (M10BMC_LEGACY_BUILD_VER), so its read out value would have
140 * not been M10BMC_VER_LEGACY_INVALID (0xffffffff). But in new BMC
141 * chips that the driver supports, the value of this register should be
142 * M10BMC_VER_LEGACY_INVALID.
143 */
144 ret = m10bmc_raw_read(ddata, M10BMC_LEGACY_BUILD_VER, &v);
145 if (ret)
146 return -ENODEV;
147
148 if (v != M10BMC_VER_LEGACY_INVALID) {
149 dev_err(ddata->dev, "bad version M10BMC detected\n");
150 return -ENODEV;
151 }
152
153 return 0;
154}
155
156static int intel_m10_bmc_spi_probe(struct spi_device *spi)
157{
158 const struct spi_device_id *id = spi_get_device_id(spi);
159 struct device *dev = &spi->dev;
160 struct mfd_cell *cells;
161 struct intel_m10bmc *ddata;
162 int ret, n_cell;
163
164 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
165 if (!ddata)
166 return -ENOMEM;
167
168 ddata->dev = dev;
169
170 ddata->regmap =
171 devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
172 if (IS_ERR(ddata->regmap)) {
173 ret = PTR_ERR(ddata->regmap);
174 dev_err(dev, "Failed to allocate regmap: %d\n", ret);
175 return ret;
176 }
177
178 spi_set_drvdata(spi, ddata);
179
180 ret = check_m10bmc_version(ddata);
181 if (ret) {
182 dev_err(dev, "Failed to identify m10bmc hardware\n");
183 return ret;
184 }
185
186 switch (id->driver_data) {
187 case M10_N3000:
188 cells = m10bmc_pacn3000_subdevs;
189 n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs);
190 break;
191 case M10_D5005:
192 cells = m10bmc_d5005_subdevs;
193 n_cell = ARRAY_SIZE(m10bmc_d5005_subdevs);
194 break;
195 default:
196 return -ENODEV;
197 }
198
199 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell,
200 NULL, 0, NULL);
201 if (ret)
202 dev_err(dev, "Failed to register sub-devices: %d\n", ret);
203
204 return ret;
205}
206
207static const struct spi_device_id m10bmc_spi_id[] = {
208 { "m10-n3000", M10_N3000 },
209 { "m10-d5005", M10_D5005 },
210 { }
211};
212MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
213
214static struct spi_driver intel_m10bmc_spi_driver = {
215 .driver = {
216 .name = "intel-m10-bmc",
217 .dev_groups = m10bmc_groups,
218 },
219 .probe = intel_m10_bmc_spi_probe,
220 .id_table = m10bmc_spi_id,
221};
222module_spi_driver(intel_m10bmc_spi_driver);
223
224MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver");
225MODULE_AUTHOR("Intel Corporation");
226MODULE_LICENSE("GPL v2");
227MODULE_ALIAS("spi:intel-m10-bmc");