From f469dcd53ba83992d983dfab6cd5f79c0a5b2e90 Mon Sep 17 00:00:00 2001 From: Namyoon Woo Date: Thu, 6 Feb 2020 10:30:30 -0800 Subject: ccdblock can block EC-CR50 communication This patch introduces 'EC_CR50_COMM' a new option for ccdblock console command. It can be useful for system rescue purpose like you want to force cr50 to yield EC_UART (especially TX) port to servo. BUG=chromium:1047287 BRANCH=cr50, cr50-mp TEST=ran manually ccdblock. > ccdstate AP: off AP UART: off EC: on Rdd: connected Servo: undetectable CCD EXT: enabled State flags: UARTEC+TX I2C SPI CCD ports blocked: (none) > > > ccdblock EC_CR50_COMM enable CCD ports blocked: EC_CR50_COMM > [73.386550 CCD state: UARTEC I2C SPI] > > ccdstate AP: off AP UART: off EC: on Rdd: connected Servo: disconnected CCD EXT: enabled State flags: UARTEC I2C SPI CCD ports blocked: EC_CR50_COMM > > > ccdblock EC_CR50_COMM disable CCD ports blocked: (none) > [104.781623 CCD state: UARTEC+TX I2C SPI] ccdstate AP: off AP UART: off EC: on Rdd: connected Servo: undetectable CCD EXT: enabled State flags: UARTEC+TX I2C SPI CCD ports blocked: (none) Change-Id: I7816c201054f1793906bd19d4b58755593d2fbac Signed-off-by: Namyoon Woo Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2042118 Reviewed-by: Mary Ruthven --- board/cr50/rdd.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) (limited to 'board/cr50/rdd.c') diff --git a/board/cr50/rdd.c b/board/cr50/rdd.c index 2e5ccc7e81..228f076831 100644 --- a/board/cr50/rdd.c +++ b/board/cr50/rdd.c @@ -56,7 +56,13 @@ enum ccd_block_flags { * uart while servo is connected, it could break the hardware and the * ccd uart could become permanently unusable. */ - CCD_BLOCK_IGNORE_SERVO = BIT(3) + CCD_BLOCK_IGNORE_SERVO = BIT(3), + + /* + * This will block EC-CR50-communication. CR50 should not enable EC + * UART. + */ + CCD_BLOCK_EC_CR50_COMM = BIT(4) }; /* Which UARTs are blocked by console command */ @@ -300,9 +306,11 @@ static void ccd_state_change_hook(void) /* * EC UART flags are cleared if ccd ext is not detected or if ccd block * EC UART is enabled. EC-CR50 comm trumps both of those conditions. - * Re-enable the EC UART flags if EC-CR50 comm is enabled. + * Re-enable the EC UART flags if EC-CR50 comm is enabled and + * CCD_BLOCK_EC_CR50_COMM must be off in ccd_block bitmap. */ - if (ec_comm_is_uart_in_packet_mode(UART_EC)) + if (ec_comm_is_uart_in_packet_mode(UART_EC) && + !(ccd_block & CCD_BLOCK_EC_CR50_COMM)) flags_want |= (CCD_ENABLE_UART_EC | CCD_ENABLE_UART_EC_TX); /* @@ -442,6 +450,8 @@ static void print_ccd_ports_blocked(void) ccputs("\nWARNING: enabling UART while servo is connected may " "damage hardware"); } + if (ccd_block & CCD_BLOCK_EC_CR50_COMM) + ccputs(" EC_CR50_COMM"); if (!ccd_block) ccputs(" (none)"); ccputs("\n"); @@ -484,6 +494,8 @@ static int command_ccd_block(int argc, char **argv) block_flag = CCD_BLOCK_SERVO_SHARED; else if (!strcasecmp(argv[1], "IGNORE_SERVO")) block_flag = CCD_BLOCK_IGNORE_SERVO; + else if (!strcasecmp(argv[1], "EC_CR50_COMM")) + block_flag = CCD_BLOCK_EC_CR50_COMM; else return EC_ERROR_PARAM1; @@ -497,6 +509,8 @@ static int command_ccd_block(int argc, char **argv) if (block_flag == CCD_BLOCK_IGNORE_SERVO) servo_ignore(new_state); + else if (block_flag == CCD_BLOCK_EC_CR50_COMM) + ec_comm_block(new_state); /* Update blocked state in deferred function */ ccd_update_state(); @@ -507,5 +521,6 @@ static int command_ccd_block(int argc, char **argv) return EC_SUCCESS; } DECLARE_CONSOLE_COMMAND(ccdblock, command_ccd_block, - "[ [BOOLEAN]]", + "[" + " [BOOLEAN]]", "Force CCD ports disabled"); -- cgit v1.2.1