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soc/intel_adsp: Fix region cacheability for MP cores

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On MP cores that don't come through the core entry point
(e.g. TGL/v2.5) we reach C code with hardware defaults for the RPO/TLB
settings.  Set these up correctly on entry.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2021-08-05 12:57:20 -07:00 • committed by Anas Nashif
commit 5183e5e606
1 changed files with 17 additions and 0 deletions
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17
soc/xtensa/intel_adsp/common/soc_mp.c
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@ -122,6 +122,23 @@ void z_mp_entry(void)
volatile int ie;
uint32_t idc_reg;
/* Correct the Region Protection Option cachability settings.
* The hardware defaults (everything accessible and uncached)
* don't match the design intent. Registers in the first
* region are RW but uncached, as is the RAM mapped in the
* fifth. The same RAM in the sixth is mapped cached. Note
* that there's actually a HAL call to do this by emulating
* the older cacheattr feature, but it generates significantly
* more code.
*/
const uint32_t attribs[] = { 2, 15, 15, 15, 2, 4, 15, 15 };
for (int region = 0; region < 8; region++) {
uint32_t addr = 0x20000000 * region;
__asm__ volatile("wdtlb %0, %1" :: "r"(attribs[region]), "r"(addr));
}
/* We don't know what the boot ROM might have touched and we
* don't care. Make sure it's not in our local cache to be
* flushed accidentally later.