How to read/write CAAM registers in non-secure world kernel?

hhan — Tue, 20 May 2014 14:58:56 GMT

I would like to read/write CAAM's Master Configuration Register (MCFGR) (address space 0x02100000+4) in non-secure world Linux kernel, but it does not function well and always return 0. The code I have used is as follows:

res = platform_get_resource_byname(pdev,

IORESOURCE_MEM, "iobase_caam");

if (!res) {

dev_err(dev, "caam: invalid address resource type\n");

return -ENODEV;

}

ctrl = ioremap(res->start, SZ_64K); //0x02100000

if (ctrl == NULL) {

dev_err(dev, "caam: ioremap() failed\n");

return -ENOMEM;

}

...

printk("MCFGR: %x\n", ioread32(&ctrl->mcr)); //0x02100000 + 4

setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE |(sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));

printk("MCFGR: %x\n", ioread32(&ctrl->mcr));

The returned value is always 0, while the expected value is 0x2140

U-Boot > md.l 0x02100000 6

02100000: 00000000 00002140 00000000 00000001 ....@!..........

02100010: 00000001 00020002 ........

I have set the CSU_CSL17 register to 0x00ff00ff so that CAAM can be accessible in both non-secure and secure worlds. However, it does not solve the problem. Could anyone please help me figure it out?

Thank you very much!

Re: How to read/write CAAM registers in non-secure world kernel?

Yuri — Mon, 26 May 2014 06:36:58 GMT

Please use Linux driver as examples how to access CAAM registers,

In particular use test module tcrypt.c. The sources may be found in

<kernel>/drivers/crypto/

<kernel>/drivers/crypto/caam

Also please refer to Chapter 51 [CAAM (Cryptographic Acceleration and Assurance

Module)] of “i.MX_6_Linux_Reference_Manual.pdf”.

https://www.freescale.com/webapp/Download?colCode=L3.10.17_1.0.0_IMX6QDLS_BUNDLE&appType=license&location=null&fasp=1&WT…

Have a great day,
Yuri

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i.MX ProcessorsのトピックHow to read/write CAAM registers in non-secure world kernel?

How to read/write CAAM registers in non-secure world kernel?

Re: How to read/write CAAM registers in non-secure world kernel?