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/dev_printk.h> 9 #include <linux/init.h> 10 #include <linux/mfd/core.h> 11 #include <linux/mfd/intel-m10-bmc.h> 12 #include <linux/module.h> 13 #include <linux/regmap.h> 14 #include <linux/spi/spi.h> 15 16 static const struct regmap_range m10bmc_regmap_range[] = { 17 regmap_reg_range(M10BMC_N3000_LEGACY_BUILD_VER, M10BMC_N3000_LEGACY_BUILD_VER), 18 regmap_reg_range(M10BMC_N3000_SYS_BASE, M10BMC_N3000_SYS_END), 19 regmap_reg_range(M10BMC_N3000_FLASH_BASE, M10BMC_N3000_FLASH_END), 20 }; 21 22 static const struct regmap_access_table m10bmc_access_table = { 23 .yes_ranges = m10bmc_regmap_range, 24 .n_yes_ranges = ARRAY_SIZE(m10bmc_regmap_range), 25 }; 26 27 static struct regmap_config intel_m10bmc_regmap_config = { 28 .reg_bits = 32, 29 .val_bits = 32, 30 .reg_stride = 4, 31 .wr_table = &m10bmc_access_table, 32 .rd_table = &m10bmc_access_table, 33 .max_register = M10BMC_N3000_MEM_END, 34 }; 35 36 static int check_m10bmc_version(struct intel_m10bmc *ddata) 37 { 38 unsigned int v; 39 int ret; 40 41 /* 42 * This check is to filter out the very old legacy BMC versions. In the 43 * old BMC chips, the BMC version info is stored in the old version 44 * register (M10BMC_N3000_LEGACY_BUILD_VER), so its read out value would have 45 * not been M10BMC_N3000_VER_LEGACY_INVALID (0xffffffff). But in new BMC 46 * chips that the driver supports, the value of this register should be 47 * M10BMC_N3000_VER_LEGACY_INVALID. 48 */ 49 ret = m10bmc_raw_read(ddata, M10BMC_N3000_LEGACY_BUILD_VER, &v); 50 if (ret) 51 return -ENODEV; 52 53 if (v != M10BMC_N3000_VER_LEGACY_INVALID) { 54 dev_err(ddata->dev, "bad version M10BMC detected\n"); 55 return -ENODEV; 56 } 57 58 return 0; 59 } 60 61 static int intel_m10_bmc_spi_probe(struct spi_device *spi) 62 { 63 const struct spi_device_id *id = spi_get_device_id(spi); 64 const struct intel_m10bmc_platform_info *info; 65 struct device *dev = &spi->dev; 66 struct intel_m10bmc *ddata; 67 int ret; 68 69 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); 70 if (!ddata) 71 return -ENOMEM; 72 73 info = (struct intel_m10bmc_platform_info *)id->driver_data; 74 ddata->dev = dev; 75 76 ddata->regmap = devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config); 77 if (IS_ERR(ddata->regmap)) { 78 ret = PTR_ERR(ddata->regmap); 79 dev_err(dev, "Failed to allocate regmap: %d\n", ret); 80 return ret; 81 } 82 83 spi_set_drvdata(spi, ddata); 84 85 ret = check_m10bmc_version(ddata); 86 if (ret) { 87 dev_err(dev, "Failed to identify m10bmc hardware\n"); 88 return ret; 89 } 90 91 return m10bmc_dev_init(ddata, info); 92 } 93 94 static const struct m10bmc_csr_map m10bmc_n3000_csr_map = { 95 .base = M10BMC_N3000_SYS_BASE, 96 .build_version = M10BMC_N3000_BUILD_VER, 97 .fw_version = NIOS2_N3000_FW_VERSION, 98 .mac_low = M10BMC_N3000_MAC_LOW, 99 .mac_high = M10BMC_N3000_MAC_HIGH, 100 .doorbell = M10BMC_N3000_DOORBELL, 101 .auth_result = M10BMC_N3000_AUTH_RESULT, 102 .bmc_prog_addr = M10BMC_N3000_BMC_PROG_ADDR, 103 .bmc_reh_addr = M10BMC_N3000_BMC_REH_ADDR, 104 .bmc_magic = M10BMC_N3000_BMC_PROG_MAGIC, 105 .sr_prog_addr = M10BMC_N3000_SR_PROG_ADDR, 106 .sr_reh_addr = M10BMC_N3000_SR_REH_ADDR, 107 .sr_magic = M10BMC_N3000_SR_PROG_MAGIC, 108 .pr_prog_addr = M10BMC_N3000_PR_PROG_ADDR, 109 .pr_reh_addr = M10BMC_N3000_PR_REH_ADDR, 110 .pr_magic = M10BMC_N3000_PR_PROG_MAGIC, 111 .rsu_update_counter = M10BMC_N3000_STAGING_FLASH_COUNT, 112 }; 113 114 static struct mfd_cell m10bmc_d5005_subdevs[] = { 115 { .name = "d5005bmc-hwmon" }, 116 { .name = "d5005bmc-sec-update" }, 117 }; 118 119 static struct mfd_cell m10bmc_pacn3000_subdevs[] = { 120 { .name = "n3000bmc-hwmon" }, 121 { .name = "n3000bmc-retimer" }, 122 { .name = "n3000bmc-sec-update" }, 123 }; 124 125 static struct mfd_cell m10bmc_n5010_subdevs[] = { 126 { .name = "n5010bmc-hwmon" }, 127 }; 128 129 static const struct intel_m10bmc_platform_info m10bmc_spi_n3000 = { 130 .cells = m10bmc_pacn3000_subdevs, 131 .n_cells = ARRAY_SIZE(m10bmc_pacn3000_subdevs), 132 .csr_map = &m10bmc_n3000_csr_map, 133 }; 134 135 static const struct intel_m10bmc_platform_info m10bmc_spi_d5005 = { 136 .cells = m10bmc_d5005_subdevs, 137 .n_cells = ARRAY_SIZE(m10bmc_d5005_subdevs), 138 .csr_map = &m10bmc_n3000_csr_map, 139 }; 140 141 static const struct intel_m10bmc_platform_info m10bmc_spi_n5010 = { 142 .cells = m10bmc_n5010_subdevs, 143 .n_cells = ARRAY_SIZE(m10bmc_n5010_subdevs), 144 .csr_map = &m10bmc_n3000_csr_map, 145 }; 146 147 static const struct spi_device_id m10bmc_spi_id[] = { 148 { "m10-n3000", (kernel_ulong_t)&m10bmc_spi_n3000 }, 149 { "m10-d5005", (kernel_ulong_t)&m10bmc_spi_d5005 }, 150 { "m10-n5010", (kernel_ulong_t)&m10bmc_spi_n5010 }, 151 { } 152 }; 153 MODULE_DEVICE_TABLE(spi, m10bmc_spi_id); 154 155 static struct spi_driver intel_m10bmc_spi_driver = { 156 .driver = { 157 .name = "intel-m10-bmc", 158 .dev_groups = m10bmc_dev_groups, 159 }, 160 .probe = intel_m10_bmc_spi_probe, 161 .id_table = m10bmc_spi_id, 162 }; 163 module_spi_driver(intel_m10bmc_spi_driver); 164 165 MODULE_DESCRIPTION("Intel MAX 10 BMC SPI bus interface"); 166 MODULE_AUTHOR("Intel Corporation"); 167 MODULE_LICENSE("GPL v2"); 168 MODULE_ALIAS("spi:intel-m10-bmc"); 169