intel-m10-bmc.c (5990B)
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 M10_N5010, 20}; 21 22static struct mfd_cell m10bmc_d5005_subdevs[] = { 23 { .name = "d5005bmc-hwmon" }, 24}; 25 26static struct mfd_cell m10bmc_pacn3000_subdevs[] = { 27 { .name = "n3000bmc-hwmon" }, 28 { .name = "n3000bmc-retimer" }, 29 { .name = "n3000bmc-secure" }, 30}; 31 32static struct mfd_cell m10bmc_n5010_subdevs[] = { 33 { .name = "n5010bmc-hwmon" }, 34}; 35 36static const struct regmap_range m10bmc_regmap_range[] = { 37 regmap_reg_range(M10BMC_LEGACY_BUILD_VER, M10BMC_LEGACY_BUILD_VER), 38 regmap_reg_range(M10BMC_SYS_BASE, M10BMC_SYS_END), 39 regmap_reg_range(M10BMC_FLASH_BASE, M10BMC_FLASH_END), 40}; 41 42static const struct regmap_access_table m10bmc_access_table = { 43 .yes_ranges = m10bmc_regmap_range, 44 .n_yes_ranges = ARRAY_SIZE(m10bmc_regmap_range), 45}; 46 47static struct regmap_config intel_m10bmc_regmap_config = { 48 .reg_bits = 32, 49 .val_bits = 32, 50 .reg_stride = 4, 51 .wr_table = &m10bmc_access_table, 52 .rd_table = &m10bmc_access_table, 53 .max_register = M10BMC_MEM_END, 54}; 55 56static ssize_t bmc_version_show(struct device *dev, 57 struct device_attribute *attr, char *buf) 58{ 59 struct intel_m10bmc *ddata = dev_get_drvdata(dev); 60 unsigned int val; 61 int ret; 62 63 ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val); 64 if (ret) 65 return ret; 66 67 return sprintf(buf, "0x%x\n", val); 68} 69static DEVICE_ATTR_RO(bmc_version); 70 71static ssize_t bmcfw_version_show(struct device *dev, 72 struct device_attribute *attr, char *buf) 73{ 74 struct intel_m10bmc *ddata = dev_get_drvdata(dev); 75 unsigned int val; 76 int ret; 77 78 ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val); 79 if (ret) 80 return ret; 81 82 return sprintf(buf, "0x%x\n", val); 83} 84static DEVICE_ATTR_RO(bmcfw_version); 85 86static ssize_t mac_address_show(struct device *dev, 87 struct device_attribute *attr, char *buf) 88{ 89 struct intel_m10bmc *max10 = dev_get_drvdata(dev); 90 unsigned int macaddr_low, macaddr_high; 91 int ret; 92 93 ret = m10bmc_sys_read(max10, M10BMC_MAC_LOW, &macaddr_low); 94 if (ret) 95 return ret; 96 97 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high); 98 if (ret) 99 return ret; 100 101 return sysfs_emit(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n", 102 (u8)FIELD_GET(M10BMC_MAC_BYTE1, macaddr_low), 103 (u8)FIELD_GET(M10BMC_MAC_BYTE2, macaddr_low), 104 (u8)FIELD_GET(M10BMC_MAC_BYTE3, macaddr_low), 105 (u8)FIELD_GET(M10BMC_MAC_BYTE4, macaddr_low), 106 (u8)FIELD_GET(M10BMC_MAC_BYTE5, macaddr_high), 107 (u8)FIELD_GET(M10BMC_MAC_BYTE6, macaddr_high)); 108} 109static DEVICE_ATTR_RO(mac_address); 110 111static ssize_t mac_count_show(struct device *dev, 112 struct device_attribute *attr, char *buf) 113{ 114 struct intel_m10bmc *max10 = dev_get_drvdata(dev); 115 unsigned int macaddr_high; 116 int ret; 117 118 ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high); 119 if (ret) 120 return ret; 121 122 return sysfs_emit(buf, "%u\n", 123 (u8)FIELD_GET(M10BMC_MAC_COUNT, macaddr_high)); 124} 125static DEVICE_ATTR_RO(mac_count); 126 127static struct attribute *m10bmc_attrs[] = { 128 &dev_attr_bmc_version.attr, 129 &dev_attr_bmcfw_version.attr, 130 &dev_attr_mac_address.attr, 131 &dev_attr_mac_count.attr, 132 NULL, 133}; 134ATTRIBUTE_GROUPS(m10bmc); 135 136static int check_m10bmc_version(struct intel_m10bmc *ddata) 137{ 138 unsigned int v; 139 int ret; 140 141 /* 142 * This check is to filter out the very old legacy BMC versions. In the 143 * old BMC chips, the BMC version info is stored in the old version 144 * register (M10BMC_LEGACY_BUILD_VER), so its read out value would have 145 * not been M10BMC_VER_LEGACY_INVALID (0xffffffff). But in new BMC 146 * chips that the driver supports, the value of this register should be 147 * M10BMC_VER_LEGACY_INVALID. 148 */ 149 ret = m10bmc_raw_read(ddata, M10BMC_LEGACY_BUILD_VER, &v); 150 if (ret) 151 return -ENODEV; 152 153 if (v != M10BMC_VER_LEGACY_INVALID) { 154 dev_err(ddata->dev, "bad version M10BMC detected\n"); 155 return -ENODEV; 156 } 157 158 return 0; 159} 160 161static int intel_m10_bmc_spi_probe(struct spi_device *spi) 162{ 163 const struct spi_device_id *id = spi_get_device_id(spi); 164 struct device *dev = &spi->dev; 165 struct mfd_cell *cells; 166 struct intel_m10bmc *ddata; 167 int ret, n_cell; 168 169 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); 170 if (!ddata) 171 return -ENOMEM; 172 173 ddata->dev = dev; 174 175 ddata->regmap = 176 devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config); 177 if (IS_ERR(ddata->regmap)) { 178 ret = PTR_ERR(ddata->regmap); 179 dev_err(dev, "Failed to allocate regmap: %d\n", ret); 180 return ret; 181 } 182 183 spi_set_drvdata(spi, ddata); 184 185 ret = check_m10bmc_version(ddata); 186 if (ret) { 187 dev_err(dev, "Failed to identify m10bmc hardware\n"); 188 return ret; 189 } 190 191 switch (id->driver_data) { 192 case M10_N3000: 193 cells = m10bmc_pacn3000_subdevs; 194 n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs); 195 break; 196 case M10_D5005: 197 cells = m10bmc_d5005_subdevs; 198 n_cell = ARRAY_SIZE(m10bmc_d5005_subdevs); 199 break; 200 case M10_N5010: 201 cells = m10bmc_n5010_subdevs; 202 n_cell = ARRAY_SIZE(m10bmc_n5010_subdevs); 203 break; 204 default: 205 return -ENODEV; 206 } 207 208 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell, 209 NULL, 0, NULL); 210 if (ret) 211 dev_err(dev, "Failed to register sub-devices: %d\n", ret); 212 213 return ret; 214} 215 216static const struct spi_device_id m10bmc_spi_id[] = { 217 { "m10-n3000", M10_N3000 }, 218 { "m10-d5005", M10_D5005 }, 219 { "m10-n5010", M10_N5010 }, 220 { } 221}; 222MODULE_DEVICE_TABLE(spi, m10bmc_spi_id); 223 224static struct spi_driver intel_m10bmc_spi_driver = { 225 .driver = { 226 .name = "intel-m10-bmc", 227 .dev_groups = m10bmc_groups, 228 }, 229 .probe = intel_m10_bmc_spi_probe, 230 .id_table = m10bmc_spi_id, 231}; 232module_spi_driver(intel_m10bmc_spi_driver); 233 234MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver"); 235MODULE_AUTHOR("Intel Corporation"); 236MODULE_LICENSE("GPL v2"); 237MODULE_ALIAS("spi:intel-m10-bmc");