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SMCCC v1.2 adds a new optional function SMCCC_ARCH_SOC_ID to obtain a SiP defined SoC identification value. Add support for the same. Also using the SoC bus infrastructure, let us expose the platform specific SoC atrributes under sysfs. There are various ways in which it can be represented in shortened form for efficiency and ease of parsing for userspace. The chosen form is described in the ABI document. Link: https://lore.kernel.org/r/20200625095939.50861-1-sudeep.holla@arm.com Cc: Etienne Carriere <etienne.carriere@st.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
// 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 (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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