1 // SPDX-License-Identifier: GPL-2.0
3 * Intel MAX 10 Board Management Controller chip
5 * Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
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>
20 static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
21 { .name = "n3000bmc-hwmon" },
22 { .name = "n3000bmc-retimer" },
23 { .name = "n3000bmc-secure" },
26 static struct regmap_config intel_m10bmc_regmap_config = {
30 .max_register = M10BMC_MEM_END,
33 static ssize_t bmc_version_show(struct device *dev,
34 struct device_attribute *attr, char *buf)
36 struct intel_m10bmc *ddata = dev_get_drvdata(dev);
40 ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val);
44 return sprintf(buf, "0x%x\n", val);
46 static DEVICE_ATTR_RO(bmc_version);
48 static ssize_t bmcfw_version_show(struct device *dev,
49 struct device_attribute *attr, char *buf)
51 struct intel_m10bmc *ddata = dev_get_drvdata(dev);
55 ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val);
59 return sprintf(buf, "0x%x\n", val);
61 static DEVICE_ATTR_RO(bmcfw_version);
63 static ssize_t mac_address_show(struct device *dev,
64 struct device_attribute *attr, char *buf)
66 struct intel_m10bmc *max10 = dev_get_drvdata(dev);
67 unsigned int macaddr_low, macaddr_high;
70 ret = m10bmc_sys_read(max10, M10BMC_MAC_LOW, &macaddr_low);
74 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
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));
86 static DEVICE_ATTR_RO(mac_address);
88 static ssize_t mac_count_show(struct device *dev,
89 struct device_attribute *attr, char *buf)
91 struct intel_m10bmc *max10 = dev_get_drvdata(dev);
92 unsigned int macaddr_high;
95 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
99 return sysfs_emit(buf, "%u\n",
100 (u8)FIELD_GET(M10BMC_MAC_COUNT, macaddr_high));
102 static DEVICE_ATTR_RO(mac_count);
104 static 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,
111 ATTRIBUTE_GROUPS(m10bmc);
113 static int check_m10bmc_version(struct intel_m10bmc *ddata)
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
128 ret = m10bmc_raw_read(ddata,
129 M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER, &v);
133 if (v != M10BMC_VER_LEGACY_INVALID) {
134 dev_err(ddata->dev, "bad version M10BMC detected\n");
141 static int intel_m10_bmc_spi_probe(struct spi_device *spi)
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;
149 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
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);
163 spi_set_drvdata(spi, ddata);
165 ret = check_m10bmc_version(ddata);
167 dev_err(dev, "Failed to identify m10bmc hardware\n");
171 switch (id->driver_data) {
173 cells = m10bmc_pacn3000_subdevs;
174 n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs);
180 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell,
183 dev_err(dev, "Failed to register sub-devices: %d\n", ret);
188 static const struct spi_device_id m10bmc_spi_id[] = {
189 { "m10-n3000", M10_N3000 },
192 MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
194 static struct spi_driver intel_m10bmc_spi_driver = {
196 .name = "intel-m10-bmc",
197 .dev_groups = m10bmc_groups,
199 .probe = intel_m10_bmc_spi_probe,
200 .id_table = m10bmc_spi_id,
202 module_spi_driver(intel_m10bmc_spi_driver);
204 MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver");
205 MODULE_AUTHOR("Intel Corporation");
206 MODULE_LICENSE("GPL v2");
207 MODULE_ALIAS("spi:intel-m10-bmc");