diff options
Diffstat (limited to 'common/i2cs_tpm.c')
| -rw-r--r-- | common/i2cs_tpm.c | 37 |
1 files changed, 30 insertions, 7 deletions
diff --git a/common/i2cs_tpm.c b/common/i2cs_tpm.c index cb893cf84f..d76befcbee 100644 --- a/common/i2cs_tpm.c +++ b/common/i2cs_tpm.c @@ -84,6 +84,8 @@ static uint32_t i2cs_fifo_adjust_count; /* Used to track number of write mismatch errors */ static uint32_t i2cs_write_error_count; +static bool int_ap_extension_enabled_; + static void process_read_access(uint16_t reg_size, uint16_t tpm_reg, uint8_t *data) { @@ -202,6 +204,11 @@ static void wr_complete_handler(void *i2cs_data, size_t i2cs_data_size) process_write_access(reg_size, tpm_reg, data, i2cs_data_size); + if (assert_int_ap()) { + gpio_enable_interrupt(GPIO_MONITOR_I2CS_SDA); + return; + } + /* * Since cr50 does not provide i2c clock stretching, we need some * onther means of flow controlling the host. Let's generate a pulse @@ -209,20 +216,23 @@ static void wr_complete_handler(void *i2cs_data, size_t i2cs_data_size) */ gpio_set_level(GPIO_INT_AP_L, 0); - /* - * This is to meet the AP requirement of minimum 4 usec - * duration of INT_AP_L assertion. - * - * TODO(b/130515803): Ideally, this should be improved - * to support any duration requirement in future. - */ tick_delay(2); gpio_set_level(GPIO_INT_AP_L, 1); } +void i2cs_sda_isr(enum gpio_signal signal) +{ + gpio_disable_interrupt(GPIO_MONITOR_I2CS_SDA); + + deassert_int_ap(); +} + static void i2cs_if_stop(void) { + if (int_ap_extension_enabled_) + int_ap_extension_stop_pulse(); + i2cs_register_write_complete_handler(NULL); } @@ -231,6 +241,12 @@ static void i2cs_if_start(void) i2cs_register_write_complete_handler(wr_complete_handler); } +/* Function that sets up for I2CS to enable INT_AP_L extension. */ +static void i2cs_int_ap_extension_enable_(void) +{ + int_ap_extension_enabled_ = true; +} + static void i2cs_if_register(void) { if (!board_tpm_uses_i2c()) @@ -239,6 +255,13 @@ static void i2cs_if_register(void) tpm_register_interface(i2cs_if_start, i2cs_if_stop); i2cs_fifo_adjust_count = 0; i2cs_write_error_count = 0; + + int_ap_register(i2cs_int_ap_extension_enable_); + + /* + * TODO: if TPM_BOARD_CFG has INT_AP extension enabled, then call + * int_ap_extension_enable(), and set int_ap_extension_enabled_ true. + */ } DECLARE_HOOK(HOOK_INIT, i2cs_if_register, HOOK_PRIO_LAST); |