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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/firmware/smccc/soc_id.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/smccc/soc_id.c')
-rw-r--r-- | drivers/firmware/smccc/soc_id.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/firmware/smccc/soc_id.c b/drivers/firmware/smccc/soc_id.c new file mode 100644 index 000000000..1990263fb --- /dev/null +++ b/drivers/firmware/smccc/soc_id.c @@ -0,0 +1,95 @@ +// 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); |