This is just an example non-secure VM partition to show how to create the device and use the PSA FF-A interface APIs.
Signed-off-by: Sudeep Holla <[email protected]> --- drivers/firmware/arm_psa_ffa/Kconfig | 7 +++ drivers/firmware/arm_psa_ffa/Makefile | 1 + drivers/firmware/arm_psa_ffa/partition.c | 71 ++++++++++++++++++++++++ 3 files changed, 79 insertions(+) create mode 100644 drivers/firmware/arm_psa_ffa/partition.c diff --git a/drivers/firmware/arm_psa_ffa/Kconfig b/drivers/firmware/arm_psa_ffa/Kconfig index ba699ec68ec4..34ad61e79234 100644 --- a/drivers/firmware/arm_psa_ffa/Kconfig +++ b/drivers/firmware/arm_psa_ffa/Kconfig @@ -13,3 +13,10 @@ config ARM_PSA_FFA_TRANSPORT This driver provides interface for all the client drivers making use of the features offered by ARM PSA-FF-A. + +config ARM_PSA_FFA_PARTITION + tristate "Arm PSA FF-A compliant partition" + depends on ARM_PSA_FFA_TRANSPORT + help + This driver provides example for ARM PSA-FF-A client driver + making use of the interfaces offered by ARM PSA-FF-A driver. diff --git a/drivers/firmware/arm_psa_ffa/Makefile b/drivers/firmware/arm_psa_ffa/Makefile index ac0455ff71a4..8eb03898baf7 100644 --- a/drivers/firmware/arm_psa_ffa/Makefile +++ b/drivers/firmware/arm_psa_ffa/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_ARM_PSA_FFA_TRANSPORT) += driver.o +obj-$(CONFIG_ARM_PSA_FFA_PARTITION) += partition.o diff --git a/drivers/firmware/arm_psa_ffa/partition.c b/drivers/firmware/arm_psa_ffa/partition.c new file mode 100644 index 000000000000..8549f8d61454 --- /dev/null +++ b/drivers/firmware/arm_psa_ffa/partition.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Arm PSA FFA example partition driver + * + * Copyright (C) 2020 Arm Ltd. + */ + +#include <linux/arm_psa_ffa.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/uuid.h> + +static int psa_ffa_partition_probe(struct platform_device *pdev) +{ + u16 vm_id; + uuid_t uuid; + const char *uuid_str; + u32 uuid0_4[4]; + struct device *dev = &pdev->dev; + const struct device_node *np = dev->of_node; + struct arm_psa_ffa_handle *handle; + struct psa_ffa_partition_info **buffer; + + handle = arm_psa_ffa_handle_get(dev); + if (!handle) + return -ENODEV; + + if (of_property_read_string(np, "uuid", &uuid_str)) { + dev_err(dev, "failed to parse \"uuid\" property in '%pOF'\n", np); + return -ENODEV; + } + + if (uuid_parse(uuid_str, &uuid)) { + dev_err(dev, "invalid \"uuid\" property (%s)\n", uuid_str); + return -ENODEV; + } + + export_uuid((u8 *)uuid0_4, &uuid); + + vm_id = handle->id_get(); + + handle->partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], + uuid0_4[3], buffer); + + return 0; +} + +static const struct of_device_id psa_ffa_partition_of_match[] = { + {.compatible = "arm,psa-ffa-partition"}, + {}, +}; + +MODULE_DEVICE_TABLE(of, psa_ffa_partition_of_match); + +static struct platform_driver psa_ffa_partition_driver = { + .driver = { + .name = "psa-ffa-partition", + .of_match_table = psa_ffa_partition_of_match, + }, + .probe = psa_ffa_partition_probe, +}; + +module_platform_driver(psa_ffa_partition_driver); + +MODULE_ALIAS("platform: arm-psa-ffa"); +MODULE_AUTHOR("Sudeep Holla <[email protected]>"); +MODULE_DESCRIPTION("Arm PSA FF-A example partition driver"); +MODULE_LICENSE("GPL v2"); -- 2.17.1
