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platform: cavs: configure resume from IMR 

To enable the feature that resuming from IMR, we need to configure IMR
layout with correct magic number and IMR restore vector, in the
platform_context_save() routine.

This is harmless even the driver want to re-downloading FW at resuming
stage, sending the FW_PURGE IPC from the host side will ask the ROM code
to omit these IMR restoring stuff.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
This commit is contained in:
Keyon Jie 2021-06-09 17:16:22 +08:00 committed by Liam Girdwood
parent e609b18b54
commit 6c0db22c65
1 changed files with 48 additions and 0 deletions
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48
src/platform/intel/cavs/platform.c
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@ -550,7 +550,55 @@ void platform_wait_for_interrupt(int level)
}
#endif
/* These structs and macros are from from the ROM code header
* on cAVS platforms, please keep them immutable
*/
#define ADSP_IMR_MAGIC_VALUE 0x02468ACE
#define IMR_L1_CACHE_ADDRESS 0xB0000000
struct imr_header {
uint32_t adsp_imr_magic;
uint32_t structure_version;
uint32_t structure_size;
uint32_t imr_state;
uint32_t imr_size;
void *imr_restore_vector;
};
struct imr_state {
struct imr_header header;
uint8_t reserved[0x1000 - sizeof(struct imr_header)];
};
struct imr_layout {
uint8_t css_reserved[0x1000];
struct imr_state imr_state;
};
/* cAVS ROM structs and macros end */
static void imr_layout_update(void *vector)
{
struct imr_layout *imr_layout = (struct imr_layout *)(IMR_L1_CACHE_ADDRESS);
/* update the IMR layout and write it back to uncache memory
* for ROM code usage. The ROM code will read this from IMR
* at the subsequent run and decide (e.g. combine with checking
* if FW_PURGE IPC from host got) if it can use the previous
* IMR FW directly. So this here is only a host->FW->ROM one way
* configuration, no symmetric task need to done in any
* platform_resume() to clear the configuration.
*/
dcache_invalidate_region(imr_layout, sizeof(*imr_layout));
imr_layout->imr_state.header.adsp_imr_magic = ADSP_IMR_MAGIC_VALUE;
imr_layout->imr_state.header.imr_restore_vector = vector;
dcache_writeback_region(imr_layout, sizeof(*imr_layout));
}
int platform_context_save(struct sof *sof)
{
imr_layout_update((void *)IMR_BOOT_LDR_TEXT_ENTRY_BASE);
return 0;
}