mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
2.9 KiB
114 lines
2.9 KiB
// 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) |
|
{ |
|
struct arm_smccc_res res; |
|
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; |
|
|
|
if (arm_smccc_1_1_get_conduit() == SMCCC_CONDUIT_NONE) { |
|
pr_err("%s: invalid SMCCC conduit\n", __func__); |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, |
|
ARM_SMCCC_ARCH_SOC_ID, &res); |
|
|
|
if (res.a0 == SMCCC_RET_NOT_SUPPORTED) { |
|
pr_info("ARCH_SOC_ID not implemented, skipping ....\n"); |
|
return 0; |
|
} |
|
|
|
if ((int)res.a0 < 0) { |
|
pr_info("ARCH_FEATURES(ARCH_SOC_ID) returned error: %lx\n", |
|
res.a0); |
|
return -EINVAL; |
|
} |
|
|
|
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 0, &res); |
|
if ((int)res.a0 < 0) { |
|
pr_err("ARCH_SOC_ID(0) returned error: %lx\n", res.a0); |
|
return -EINVAL; |
|
} |
|
|
|
soc_id_version = res.a0; |
|
|
|
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 1, &res); |
|
if ((int)res.a0 < 0) { |
|
pr_err("ARCH_SOC_ID(1) returned error: %lx\n", res.a0); |
|
return -EINVAL; |
|
} |
|
|
|
soc_id_rev = res.a0; |
|
|
|
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);
|
|
|