[TF-M] Re: Enable SPI interrupt in secure partition

Hi Kevin,

Thanks for your instruction.

We're developing an application RoT partition which access a sensor via an SPI interface(Based on RA6M4_EK development board). After commands have been transferred to the sensor, an SPI_TX_INTERRUPT should be triggered, then calls spi_tx_isr().

Now let's put aside binding secure interrupts to each secure partition, just talk about how to enable SPI interrupts in secure world simply.

Here is my implementation:

1.Configure this SPI peripheral as secure peripheral. 2.Assign SPI tx and rx interrupts to secure state by setting NVIC->ITNS register. 3.Enable SPI tx and rx interrupts by seeting NVIC->ISER register.

But during debug, I found that spi0_tx_isr() (The ISRs are also placed under this application RoT partition's folder) has never been triggered. Is there anything that I miss?

Best Regards, Poppy Wu 吴偏偏

Macronix Microelectronics (Suzhou) Co.,Ltd 旺宏微电子（苏州）有限公司 http://www.mxic.com.cn

Kevin Peng via TF-M tf-m@lists.trustedfirmware.org 2022/05/17 09:45 Please respond to Kevin Peng Kevin.Peng@arm.com

To Edward Yang EdwardYang@mxic.com.cn, "tf-m@lists.trustedfirmware.org" tf-m@lists.trustedfirmware.org cc

Subject [TF-M] Re: Enable SPI interrupt in secure partition

Hi Poppy,

First-Level Interrupt Handling (FLIH) should be recommended in your use case as you have latency requirements. Here is an example: https://git.trustedfirmware.org/TF-M/tf-m-tests.git/tree/test/secure_fw/suit...

You’ll firstly need to add an “irq” item in the manifest and “handling ” it with “FLIH”: https://git.trustedfirmware.org/TF-M/tf-m-tests.git/tree/test/secure_fw/suit... And also add the “mmio_regions” item with the associated device (SPI) to give access permissions to the Secure Partition.

The IRQ handling should be in the Secure Partition: https://git.trustedfirmware.org/TF-M/tf-m-tests.git/tree/test/secure_fw/suit... Note that, no PSA APIs are allowed in the handling.

Best Regards, Kevin

From: Edward Yang via TF-M tf-m@lists.trustedfirmware.org Sent: Monday, May 16, 2022 5:38 PM To: tf-m@lists.trustedfirmware.org Subject: [TF-M] Enable SPI interrupt in secure partition

Hi experts,

Recently we're developing a demo based on TF-M, this demo involves using SPI module to drive a sensor by sending commands in a secure partition.

And we need to enable SPI receive and send interrupt in this secure partition and the latency shall be as small as possible. I am wondering how to implement this secure interrupts. Is there any example code or instrucstions?

Thanks.

Best Regards, Poppy Wu 吴偏偏

Macronix Microelectronics (Suzhou) Co.,Ltd 旺宏微电子（苏州）有限公司 http://www.mxic.com.cn CONFIDENTIALITY NOTE: This e-mail and any attachments may contain confidential information and/or personal data, which is protected by applicable laws. Please be reminded that duplication, disclosure, distribution, or use of this e-mail (and/or its attachments) or any part thereof is prohibited. If you receive this e-mail in error, please notify us immediately and delete this mail as well as its attachment(s) from your system. In addition, please be informed that collection, processing, and/or use of personal data is prohibited unless expressly permitted by personal data protection laws. Thank you for your attention and cooperation. Macronix International Co., Ltd. =====================================================================-- TF-M mailing list -- tf-m@lists.trustedfirmware.org To unsubscribe send an email to tf-m-leave@lists.trustedfirmware.org

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