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hwcrypto: Fixes for disabling one hardware unit causing reset of a different unit

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ROM functions reset related units, but this can have problems in a
multithreaded environment.
This commit is contained in:
Angus Gratton
2016-11-22 18:09:32 +11:00
parent c48612e516
commit 2561b68af8
5 changed files with 55 additions and 10 deletions
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20
components/mbedtls/port/esp_bignum.c
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@@ -33,6 +33,8 @@
#include "esp_intr.h"
#include "esp_attr.h"
#include "soc/dport_reg.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
@@ -71,7 +73,16 @@ void esp_mpi_acquire_hardware( void )
{
/* newlib locks lazy initialize on ESP-IDF */
_lock_acquire(&mpi_lock);
ets_bigint_enable();
REG_SET_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_RSA);
/* also clear reset on digital signature, otherwise RSA is held in reset */
REG_CLR_BIT(DPORT_PERI_RST_EN_REG,
DPORT_PERI_EN_RSA
| DPORT_PERI_EN_DIGITAL_SIGNATURE);
REG_CLR_BIT(DPORT_RSA_PD_CTRL_REG, DPORT_RSA_PD);
while(REG_READ(RSA_CLEAN_REG) != 1);
#ifdef CONFIG_MBEDTLS_MPI_USE_INTERRUPT
rsa_isr_initialise();
#endif
@@ -79,7 +90,12 @@ void esp_mpi_acquire_hardware( void )
void esp_mpi_release_hardware( void )
{
ets_bigint_disable();
REG_SET_BIT(DPORT_RSA_PD_CTRL_REG, DPORT_RSA_PD);
/* don't reset digital signature unit, as this resets AES also */
REG_SET_BIT(DPORT_PERI_RST_EN_REG, DPORT_PERI_EN_RSA);
REG_CLR_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_RSA);
_lock_release(&mpi_lock);
}