115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2020 Arm Limited
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*/
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#define pr_fmt(fmt) "SMCCC: SOC_ID: " fmt
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#include <linux/arm-smccc.h>
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#include <linux/bitfield.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#define SMCCC_SOC_ID_JEP106_BANK_IDX_MASK GENMASK(30, 24)
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/*
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* As per the SMC Calling Convention specification v1.2 (ARM DEN 0028C)
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* Section 7.4 SMCCC_ARCH_SOC_ID bits[23:16] are JEP-106 identification
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* code with parity bit for the SiP. We can drop the parity bit.
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*/
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#define SMCCC_SOC_ID_JEP106_ID_CODE_MASK GENMASK(22, 16)
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#define SMCCC_SOC_ID_IMP_DEF_SOC_ID_MASK GENMASK(15, 0)
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#define JEP106_BANK_CONT_CODE(x) \
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(u8)(FIELD_GET(SMCCC_SOC_ID_JEP106_BANK_IDX_MASK, (x)))
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#define JEP106_ID_CODE(x) \
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(u8)(FIELD_GET(SMCCC_SOC_ID_JEP106_ID_CODE_MASK, (x)))
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#define IMP_DEF_SOC_ID(x) \
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(u16)(FIELD_GET(SMCCC_SOC_ID_IMP_DEF_SOC_ID_MASK, (x)))
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static struct soc_device *soc_dev;
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static struct soc_device_attribute *soc_dev_attr;
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static int __init smccc_soc_init(void)
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{
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struct arm_smccc_res res;
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int soc_id_rev, soc_id_version;
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static char soc_id_str[20], soc_id_rev_str[12];
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static char soc_id_jep106_id_str[12];
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if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2)
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return 0;
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if (arm_smccc_1_1_get_conduit() == SMCCC_CONDUIT_NONE) {
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pr_err("%s: invalid SMCCC conduit\n", __func__);
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return -EOPNOTSUPP;
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}
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arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
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ARM_SMCCC_ARCH_SOC_ID, &res);
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if ((int)res.a0 == SMCCC_RET_NOT_SUPPORTED) {
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pr_info("ARCH_SOC_ID not implemented, skipping ....\n");
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return 0;
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}
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if ((int)res.a0 < 0) {
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pr_info("ARCH_FEATURES(ARCH_SOC_ID) returned error: %lx\n",
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res.a0);
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return -EINVAL;
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}
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arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 0, &res);
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if ((int)res.a0 < 0) {
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pr_err("ARCH_SOC_ID(0) returned error: %lx\n", res.a0);
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return -EINVAL;
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}
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soc_id_version = res.a0;
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arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 1, &res);
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if ((int)res.a0 < 0) {
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pr_err("ARCH_SOC_ID(1) returned error: %lx\n", res.a0);
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return -EINVAL;
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}
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soc_id_rev = res.a0;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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sprintf(soc_id_rev_str, "0x%08x", soc_id_rev);
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sprintf(soc_id_jep106_id_str, "jep106:%02x%02x",
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JEP106_BANK_CONT_CODE(soc_id_version),
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JEP106_ID_CODE(soc_id_version));
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sprintf(soc_id_str, "%s:%04x", soc_id_jep106_id_str,
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IMP_DEF_SOC_ID(soc_id_version));
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soc_dev_attr->soc_id = soc_id_str;
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soc_dev_attr->revision = soc_id_rev_str;
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soc_dev_attr->family = soc_id_jep106_id_str;
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr);
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return PTR_ERR(soc_dev);
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}
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pr_info("ID = %s Revision = %s\n", soc_dev_attr->soc_id,
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soc_dev_attr->revision);
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return 0;
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}
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module_init(smccc_soc_init);
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static void __exit smccc_soc_exit(void)
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{
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if (soc_dev)
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soc_device_unregister(soc_dev);
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kfree(soc_dev_attr);
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}
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module_exit(smccc_soc_exit);
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