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soc: intel_adsp/cavs: add arch_cpu_idle support

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Cavs platforms starts from Apllolake to Raptorlake. Some of them need some
workaround for arch_cpu_idle so create a bespoken one. Each workaround is
configured by kconfig setting.

Signed-off-by: Rander Wang <rander.wang@intel.com>
This commit is contained in:
Rander Wang 2023-11-03 14:13:37 +08:00 • committed by Carles Cufí
commit 0c27d772f6
1 changed files with 45 additions and 0 deletions
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45
soc/xtensa/intel_adsp/cavs/power.c
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@ -180,6 +180,51 @@ void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
}
#endif /* CONFIG_PM */
#ifdef CONFIG_ARCH_CPU_IDLE_CUSTOM
/* xt-clang removes any NOPs more than 8. So we need to set
* no optimization to avoid those NOPs from being removed.
*
* This function is simply enough and full of hand written
* assembly that optimization is not really meaningful
* anyway. So we can skip optimization unconditionally.
* Re-evalulate its use and add #ifdef if this assumption
* is no longer valid.
*/
__no_optimization
void arch_cpu_idle(void)
{
sys_trace_idle();
/* Just spin forever with interrupts unmasked, for platforms
* where WAITI can't be used or where its behavior is
* complicated (Intel DSPs will power gate on idle entry under
* some circumstances)
*/
if (IS_ENABLED(CONFIG_XTENSA_CPU_IDLE_SPIN)) {
__asm__ volatile("rsil a0, 0");
__asm__ volatile("loop_forever: j loop_forever");
return;
}
/* Cribbed from SOF: workaround for a bug in some versions of
* the LX6 IP. Preprocessor ugliness avoids the need to
* figure out how to get the compiler to unroll a loop.
*/
if (IS_ENABLED(CONFIG_XTENSA_WAITI_BUG)) {
#define NOP4 __asm__ volatile("nop; nop; nop; nop");
#define NOP32 NOP4 NOP4 NOP4 NOP4 NOP4 NOP4 NOP4 NOP4
#define NOP128() NOP32 NOP32 NOP32 NOP32
NOP128();
#undef NOP128
#undef NOP32
#undef NOP4
__asm__ volatile("isync; extw");
}
__asm__ volatile ("waiti 0");
}
#endif
__imr void power_init(void)
{
/* Request HP ring oscillator and