Revert "chip/npcx: Add support for pad-switching UART"

This reverts commit ab9084fd2a70a505e0e43b39e0ad40876e4853fc.

BUG=b:200823466
TEST=make buildall -j

Change-Id: I2bc23607e4658260bd83c8f9c85d24fe1f9131a2
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3273444
Reviewed-by: Vadim Sukhomlinov <sukhomlinov@chromium.org>

3 files changed, 0 insertions, 54 deletions

diff --git a/core/cortex-m/panic.c b/core/cortex-m/panic.c
index df58db838b..a309728d12 100644
--- a/core/cortex-m/panic.c
+++ b/core/cortex-m/panic.c
@@ -13,7 +13,6 @@
 #include "system.h"
 #include "task.h"
 #include "timer.h"
-#include "uart.h"
 #include "util.h"
 #include "watchdog.h"
 
@@ -337,9 +336,6 @@ void __keep report_panic(void)
 	pdata->cm.hfsr = CPU_NVIC_HFSR;
 	pdata->cm.dfsr = CPU_NVIC_DFSR;
 
-#ifdef CONFIG_UART_PAD_SWITCH
-	uart_reset_default_pad_panic();
-#endif
 	panic_data_print(pdata);
 #ifdef CONFIG_DEBUG_EXCEPTIONS
 	panic_show_process_stack(pdata);
diff --git a/include/config.h b/include/config.h
index c3ad6cacd3..3623c418c3 100644
--- a/include/config.h
+++ b/include/config.h
@@ -3392,13 +3392,6 @@
 #undef CONFIG_UART_INPUT_FILTER
 
 /*
- * Allow switching the EC console UART to an alternate pad. This must be
- * used for short transactions only, and EC is only able to receive data on
- * that alternate pad after it has been explicitly switched.
- */
-#undef CONFIG_UART_PAD_SWITCH
-
-/*
  * UART receive buffer size in bytes.  Must be a power of 2 for macros in
  * common/uart_buffering.c to work properly.  Must be larger than
  * CONFIG_CONSOLE_INPUT_LINE_SIZE to copy and paste scripts.
diff --git a/include/uart.h b/include/uart.h
index e907837d14..41da673daf 100644
--- a/include/uart.h
+++ b/include/uart.h
@@ -249,49 +249,6 @@ int uart_comx_putc_ok(void);
  */
 void uart_comx_putc(int c);
 
-/*
- * Functions for pad switching UART, only defined on some chips (npcx), and
- * if CONFIG_UART_PAD_SWITCH is enabled.
- */
-enum uart_pad {
-	UART_DEFAULT_PAD = 0,
-	UART_ALTERNATE_PAD = 1,
-};
-
-/**
- * Reset UART pad to default pad, so that a panic information can be printed
- * on the EC console.
- */
-void uart_reset_default_pad_panic(void);
-
-/**
- * Specialized function to write then read data on UART alternate pad.
- * The transfer may be interrupted at any time if data is received on the main
- * pad.
- *
- * @param tx		Data to be sent
- * @param tx_len	Length of data to be sent
- * @param rx		Buffer to receive data
- * @param rx_len	Receive buffer length
- * @param timeout_us	Timeout in microseconds for the transaction to complete.
- *
- * @return The number of bytes read back (indicates a timeout if != rx_len).
- *         - -EC_ERROR_BUSY if the alternate pad cannot be used (e.g. default
- *           pad is currently being used), or if the transfer was interrupted.
- *         - -EC_ERROR_TIMEOUT in case tx_len bytes cannot be written in the
- *           time specified in timeout_us.
- */
-int uart_alt_pad_write_read(uint8_t *tx, int tx_len, uint8_t *rx, int rx_len,
-			int timeout_us);
-
-/**
- * Interrupt handler for default UART RX pin transition when UART is switched
- * to alternate pad.
- *
- * @param signal	Signal which triggered the interrupt.
- */
-void uart_default_pad_rx_interrupt(enum gpio_signal signal);
-
 /* Return the size of the free room in the UART TX circular buffer. */
 size_t uart_buffer_room(void);