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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright 2020 Arm Limited4 */5 6#define pr_fmt(fmt) "SMCCC: SOC_ID: " fmt7 8#include <linux/arm-smccc.h>9#include <linux/bitfield.h>10#include <linux/device.h>11#include <linux/module.h>12#include <linux/kernel.h>13#include <linux/slab.h>14#include <linux/sys_soc.h>15 16#define SMCCC_SOC_ID_JEP106_BANK_IDX_MASK GENMASK(30, 24)17/*18 * As per the SMC Calling Convention specification v1.2 (ARM DEN 0028C)19 * Section 7.4 SMCCC_ARCH_SOC_ID bits[23:16] are JEP-106 identification20 * code with parity bit for the SiP. We can drop the parity bit.21 */22#define SMCCC_SOC_ID_JEP106_ID_CODE_MASK GENMASK(22, 16)23#define SMCCC_SOC_ID_IMP_DEF_SOC_ID_MASK GENMASK(15, 0)24 25#define JEP106_BANK_CONT_CODE(x) \26 (u8)(FIELD_GET(SMCCC_SOC_ID_JEP106_BANK_IDX_MASK, (x)))27#define JEP106_ID_CODE(x) \28 (u8)(FIELD_GET(SMCCC_SOC_ID_JEP106_ID_CODE_MASK, (x)))29#define IMP_DEF_SOC_ID(x) \30 (u16)(FIELD_GET(SMCCC_SOC_ID_IMP_DEF_SOC_ID_MASK, (x)))31 32static struct soc_device *soc_dev;33static struct soc_device_attribute *soc_dev_attr;34 35static int __init smccc_soc_init(void)36{37 int soc_id_rev, soc_id_version;38 static char soc_id_str[20], soc_id_rev_str[12];39 static char soc_id_jep106_id_str[12];40 41 if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2)42 return 0;43 44 soc_id_version = arm_smccc_get_soc_id_version();45 if (soc_id_version == SMCCC_RET_NOT_SUPPORTED) {46 pr_info("ARCH_SOC_ID not implemented, skipping ....\n");47 return 0;48 }49 50 if (soc_id_version < 0) {51 pr_err("Invalid SoC Version: %x\n", soc_id_version);52 return -EINVAL;53 }54 55 soc_id_rev = arm_smccc_get_soc_id_revision();56 if (soc_id_rev < 0) {57 pr_err("Invalid SoC Revision: %x\n", soc_id_rev);58 return -EINVAL;59 }60 61 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);62 if (!soc_dev_attr)63 return -ENOMEM;64 65 sprintf(soc_id_rev_str, "0x%08x", soc_id_rev);66 sprintf(soc_id_jep106_id_str, "jep106:%02x%02x",67 JEP106_BANK_CONT_CODE(soc_id_version),68 JEP106_ID_CODE(soc_id_version));69 sprintf(soc_id_str, "%s:%04x", soc_id_jep106_id_str,70 IMP_DEF_SOC_ID(soc_id_version));71 72 soc_dev_attr->soc_id = soc_id_str;73 soc_dev_attr->revision = soc_id_rev_str;74 soc_dev_attr->family = soc_id_jep106_id_str;75 76 soc_dev = soc_device_register(soc_dev_attr);77 if (IS_ERR(soc_dev)) {78 kfree(soc_dev_attr);79 return PTR_ERR(soc_dev);80 }81 82 pr_info("ID = %s Revision = %s\n", soc_dev_attr->soc_id,83 soc_dev_attr->revision);84 85 return 0;86}87module_init(smccc_soc_init);88 89static void __exit smccc_soc_exit(void)90{91 if (soc_dev)92 soc_device_unregister(soc_dev);93 kfree(soc_dev_attr);94}95module_exit(smccc_soc_exit);96