diff options
Diffstat (limited to 'drivers/mfd/intel-m10-bmc-core.c')
| -rw-r--r-- | drivers/mfd/intel-m10-bmc-core.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/mfd/intel-m10-bmc-core.c b/drivers/mfd/intel-m10-bmc-core.c new file mode 100644 index 000000000..8ad5b3821 --- /dev/null +++ b/drivers/mfd/intel-m10-bmc-core.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel MAX 10 Board Management Controller chip - common code + * + * Copyright (C) 2018-2020 Intel Corporation. All rights reserved. + */ + +#include <linux/bitfield.h> +#include <linux/device.h> +#include <linux/dev_printk.h> +#include <linux/mfd/core.h> +#include <linux/mfd/intel-m10-bmc.h> +#include <linux/module.h> + +void m10bmc_fw_state_set(struct intel_m10bmc *m10bmc, enum m10bmc_fw_state new_state) +{ + /* bmcfw_state is only needed if handshake_sys_reg_nranges > 0 */ + if (!m10bmc->info->handshake_sys_reg_nranges) + return; + + down_write(&m10bmc->bmcfw_lock); + m10bmc->bmcfw_state = new_state; + up_write(&m10bmc->bmcfw_lock); +} +EXPORT_SYMBOL_NS_GPL(m10bmc_fw_state_set, INTEL_M10_BMC_CORE); + +/* + * For some Intel FPGA devices, the BMC firmware is not available to service + * handshake registers during a secure update. + */ +static bool m10bmc_reg_always_available(struct intel_m10bmc *m10bmc, unsigned int offset) +{ + if (!m10bmc->info->handshake_sys_reg_nranges) + return true; + + return !regmap_reg_in_ranges(offset, m10bmc->info->handshake_sys_reg_ranges, + m10bmc->info->handshake_sys_reg_nranges); +} + +/* + * m10bmc_handshake_reg_unavailable - Checks if reg access collides with secure update state + * @m10bmc: M10 BMC structure + * + * For some Intel FPGA devices, the BMC firmware is not available to service + * handshake registers during a secure update erase and write phases. + * + * Context: @m10bmc->bmcfw_lock must be held. + */ +static bool m10bmc_handshake_reg_unavailable(struct intel_m10bmc *m10bmc) +{ + return m10bmc->bmcfw_state == M10BMC_FW_STATE_SEC_UPDATE_PREPARE || + m10bmc->bmcfw_state == M10BMC_FW_STATE_SEC_UPDATE_WRITE; +} + +/* + * This function helps to simplify the accessing of the system registers. + * + * The base of the system registers is configured through the struct + * csr_map. + */ +int m10bmc_sys_read(struct intel_m10bmc *m10bmc, unsigned int offset, unsigned int *val) +{ + const struct m10bmc_csr_map *csr_map = m10bmc->info->csr_map; + int ret; + + if (m10bmc_reg_always_available(m10bmc, offset)) + return m10bmc_raw_read(m10bmc, csr_map->base + offset, val); + + down_read(&m10bmc->bmcfw_lock); + if (m10bmc_handshake_reg_unavailable(m10bmc)) + ret = -EBUSY; /* Reg not available during secure update */ + else + ret = m10bmc_raw_read(m10bmc, csr_map->base + offset, val); + up_read(&m10bmc->bmcfw_lock); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(m10bmc_sys_read, INTEL_M10_BMC_CORE); + +int m10bmc_sys_update_bits(struct intel_m10bmc *m10bmc, unsigned int offset, + unsigned int msk, unsigned int val) +{ + const struct m10bmc_csr_map *csr_map = m10bmc->info->csr_map; + int ret; + + if (m10bmc_reg_always_available(m10bmc, offset)) + return regmap_update_bits(m10bmc->regmap, csr_map->base + offset, msk, val); + + down_read(&m10bmc->bmcfw_lock); + if (m10bmc_handshake_reg_unavailable(m10bmc)) + ret = -EBUSY; /* Reg not available during secure update */ + else + ret = regmap_update_bits(m10bmc->regmap, csr_map->base + offset, msk, val); + up_read(&m10bmc->bmcfw_lock); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(m10bmc_sys_update_bits, INTEL_M10_BMC_CORE); + +static ssize_t bmc_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct intel_m10bmc *ddata = dev_get_drvdata(dev); + unsigned int val; + int ret; + + ret = m10bmc_sys_read(ddata, ddata->info->csr_map->build_version, &val); + if (ret) + return ret; + + return sprintf(buf, "0x%x\n", val); +} +static DEVICE_ATTR_RO(bmc_version); + +static ssize_t bmcfw_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct intel_m10bmc *ddata = dev_get_drvdata(dev); + unsigned int val; + int ret; + + ret = m10bmc_sys_read(ddata, ddata->info->csr_map->fw_version, &val); + if (ret) + return ret; + + return sprintf(buf, "0x%x\n", val); +} +static DEVICE_ATTR_RO(bmcfw_version); + +static ssize_t mac_address_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct intel_m10bmc *ddata = dev_get_drvdata(dev); + unsigned int macaddr_low, macaddr_high; + int ret; + + ret = m10bmc_sys_read(ddata, ddata->info->csr_map->mac_low, &macaddr_low); + if (ret) + return ret; + + ret = m10bmc_sys_read(ddata, ddata->info->csr_map->mac_high, &macaddr_high); + if (ret) + return ret; + + return sysfs_emit(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n", + (u8)FIELD_GET(M10BMC_N3000_MAC_BYTE1, macaddr_low), + (u8)FIELD_GET(M10BMC_N3000_MAC_BYTE2, macaddr_low), + (u8)FIELD_GET(M10BMC_N3000_MAC_BYTE3, macaddr_low), + (u8)FIELD_GET(M10BMC_N3000_MAC_BYTE4, macaddr_low), + (u8)FIELD_GET(M10BMC_N3000_MAC_BYTE5, macaddr_high), + (u8)FIELD_GET(M10BMC_N3000_MAC_BYTE6, macaddr_high)); +} +static DEVICE_ATTR_RO(mac_address); + +static ssize_t mac_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct intel_m10bmc *ddata = dev_get_drvdata(dev); + unsigned int macaddr_high; + int ret; + + ret = m10bmc_sys_read(ddata, ddata->info->csr_map->mac_high, &macaddr_high); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", (u8)FIELD_GET(M10BMC_N3000_MAC_COUNT, macaddr_high)); +} +static DEVICE_ATTR_RO(mac_count); + +static struct attribute *m10bmc_attrs[] = { + &dev_attr_bmc_version.attr, + &dev_attr_bmcfw_version.attr, + &dev_attr_mac_address.attr, + &dev_attr_mac_count.attr, + NULL, +}; + +static const struct attribute_group m10bmc_group = { + .attrs = m10bmc_attrs, +}; + +const struct attribute_group *m10bmc_dev_groups[] = { + &m10bmc_group, + NULL, +}; +EXPORT_SYMBOL_NS_GPL(m10bmc_dev_groups, INTEL_M10_BMC_CORE); + +int m10bmc_dev_init(struct intel_m10bmc *m10bmc, const struct intel_m10bmc_platform_info *info) +{ + int ret; + + m10bmc->info = info; + dev_set_drvdata(m10bmc->dev, m10bmc); + init_rwsem(&m10bmc->bmcfw_lock); + + ret = devm_mfd_add_devices(m10bmc->dev, PLATFORM_DEVID_AUTO, + info->cells, info->n_cells, + NULL, 0, NULL); + if (ret) + dev_err(m10bmc->dev, "Failed to register sub-devices: %d\n", ret); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(m10bmc_dev_init, INTEL_M10_BMC_CORE); + +MODULE_DESCRIPTION("Intel MAX 10 BMC core driver"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL v2"); |