// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2020 Arm Limited */ #define pr_fmt(fmt) "SMCCC: SOC_ID: " fmt #include <linux/arm-smccc.h> #include <linux/bitfield.h> #include <linux/device.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/sys_soc.h> #define SMCCC_SOC_ID_JEP106_BANK_IDX_MASK GENMASK(30, 24) /* * As per the SMC Calling Convention specification v1.2 (ARM DEN 0028C) * Section 7.4 SMCCC_ARCH_SOC_ID bits[23:16] are JEP-106 identification * code with parity bit for the SiP. We can drop the parity bit. */ #define SMCCC_SOC_ID_JEP106_ID_CODE_MASK GENMASK(22, 16) #define SMCCC_SOC_ID_IMP_DEF_SOC_ID_MASK GENMASK(15, 0) #define JEP106_BANK_CONT_CODE(x) \ (u8)(FIELD_GET(SMCCC_SOC_ID_JEP106_BANK_IDX_MASK, (x))) #define JEP106_ID_CODE(x) \ (u8)(FIELD_GET(SMCCC_SOC_ID_JEP106_ID_CODE_MASK, (x))) #define IMP_DEF_SOC_ID(x) \ (u16)(FIELD_GET(SMCCC_SOC_ID_IMP_DEF_SOC_ID_MASK, (x))) static struct soc_device *soc_dev; static struct soc_device_attribute *soc_dev_attr; static int __init smccc_soc_init(void) { int soc_id_rev, soc_id_version; static char soc_id_str[20], soc_id_rev_str[12]; static char soc_id_jep106_id_str[12]; if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2) return 0; soc_id_version = arm_smccc_get_soc_id_version(); if (soc_id_version == SMCCC_RET_NOT_SUPPORTED) { pr_info("ARCH_SOC_ID not implemented, skipping ....\n"); return 0; } if (soc_id_version < 0) { pr_err("Invalid SoC Version: %x\n", soc_id_version); return -EINVAL; } soc_id_rev = arm_smccc_get_soc_id_revision(); if (soc_id_rev < 0) { pr_err("Invalid SoC Revision: %x\n", soc_id_rev); return -EINVAL; } soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); if (!soc_dev_attr) return -ENOMEM; sprintf(soc_id_rev_str, "0x%08x", soc_id_rev); sprintf(soc_id_jep106_id_str, "jep106:%02x%02x", JEP106_BANK_CONT_CODE(soc_id_version), JEP106_ID_CODE(soc_id_version)); sprintf(soc_id_str, "%s:%04x", soc_id_jep106_id_str, IMP_DEF_SOC_ID(soc_id_version)); soc_dev_attr->soc_id = soc_id_str; soc_dev_attr->revision = soc_id_rev_str; soc_dev_attr->family = soc_id_jep106_id_str; soc_dev = soc_device_register(soc_dev_attr); if (IS_ERR(soc_dev)) { kfree(soc_dev_attr); return PTR_ERR(soc_dev); } pr_info("ID = %s Revision = %s\n", soc_dev_attr->soc_id, soc_dev_attr->revision); return 0; } module_init(smccc_soc_init); static void __exit smccc_soc_exit(void) { if (soc_dev) soc_device_unregister(soc_dev); kfree(soc_dev_attr); } module_exit(smccc_soc_exit);