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This patch intends to use SMC call to obtain these information and then register i.MX9 SoC as a device. Signed-off-by: alice.guo --- drivers/soc/imx/Makefile | 2 +- drivers/soc/imx/soc-imx9.c | 102 +++++++++++++++++++++++++++++++++++++ 2 files changed, 103 insertions(+), 1 deletion(-) create mode 100644 drivers/soc/imx/soc-imx9.c diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile index 3ad321ca608a..ca6a5fa1618f 100644 --- a/drivers/soc/imx/Makefile +++ b/drivers/soc/imx/Makefile @@ -3,4 +3,4 @@ ifeq ($(CONFIG_ARM),y) obj-$(CONFIG_ARCH_MXC) += soc-imx.o endif obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o -obj-$(CONFIG_SOC_IMX9) += imx93-src.o +obj-$(CONFIG_SOC_IMX9) += imx93-src.o soc-imx9.o diff --git a/drivers/soc/imx/soc-imx9.c b/drivers/soc/imx/soc-imx9.c new file mode 100644 index 000000000000..7e8a8b2efa61 --- /dev/null +++ b/drivers/soc/imx/soc-imx9.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2024 NXP + */ + +#include +#include +#include +#include +#include +#include + +#define IMX_SIP_GET_SOC_INFO 0xc2000006 +#define SOC_ID(x) (((x) & 0xFFFF) >> 8) +#define SOC_REV_MAJOR(x) ((((x) >> 28) & 0xF) - 0x9) +#define SOC_REV_MINOR(x) (((x) >> 24) & 0xF) + +static int imx9_soc_device_register(void) +{ + struct soc_device_attribute *attr; + struct arm_smccc_res res; + struct soc_device *sdev; + u32 soc_id, rev_major, rev_minor; + u64 uid127_64, uid63_0; + int err; + + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) + return -ENOMEM; + + err = of_property_read_string(of_root, "model", &attr->machine); + if (err) { + err = -EINVAL; + goto attr; + } + + attr->family = kasprintf(GFP_KERNEL, "Freescale i.MX"); + + /* + * Retrieve the soc id, rev & uid info: + * res.a1[31:16]: soc revision; + * res.a1[15:0]: soc id; + * res.a2: uid[127:64]; + * res.a3: uid[63:0]; + */ + arm_smccc_smc(IMX_SIP_GET_SOC_INFO, 0, 0, 0, 0, 0, 0, 0, &res); + if (res.a0 != SMCCC_RET_SUCCESS) { + err = -EINVAL; + goto family; + } + + soc_id = SOC_ID(res.a1); + rev_major = SOC_REV_MAJOR(res.a1); + rev_minor = SOC_REV_MINOR(res.a1); + + attr->soc_id = kasprintf(GFP_KERNEL, "i.MX%2x", soc_id); + attr->revision = kasprintf(GFP_KERNEL, "%d.%d", rev_major, rev_minor); + + uid127_64 = res.a2; + uid63_0 = res.a3; + attr->serial_number = kasprintf(GFP_KERNEL, "%016llx%016llx", uid127_64, uid63_0); + + sdev = soc_device_register(attr); + if (IS_ERR(sdev)) { + err = -ENODEV; + goto soc_id; + } + + return 0; + +soc_id: + kfree(attr->soc_id); + kfree(attr->serial_number); + kfree(attr->revision); +family: + kfree(attr->family); +attr: + kfree(attr); + return err; +} + +static int __init imx9_soc_init(void) +{ + int ret = 0; + + if (of_machine_is_compatible("fsl,imx91") || + of_machine_is_compatible("fsl,imx93") || + of_machine_is_compatible("fsl,imx95")) { + ret = imx9_soc_device_register(); + if (ret) { + pr_err("%s: imx9_soc_device_register returned %d\n", __func__, ret); + return ret; + } + } + + return ret; +} +device_initcall(imx9_soc_init); + +MODULE_AUTHOR("NXP"); +MODULE_DESCRIPTION("NXP i.MX9 SoC"); +MODULE_LICENSE("GPL");