soc/qualcomm: move uart_bitbang UART w/gpio code to common

BUG=b:182963902
TEST=Validated on qualcomm sc7280 development board

Change-Id: Ic6c70f917a59e233f6ea518d9c39f73fe84991c3
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47284
Reviewed-by: Shelley Chen <shchen@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/soc/qualcomm/common/uart_bitbang.c b/src/soc/qualcomm/common/uart_bitbang.c
new file mode 100644
index 0000000000..943dcf8a06
--- /dev/null
+++ b/src/soc/qualcomm/common/uart_bitbang.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/uart.h>
+#include <gpio.h>
+#include <boot/coreboot_tables.h>
+#include <soc/uart.h>
+
+void uart_fill_lb(void *data)
+{
+
+}
+
+static void set_tx(int line_state)
+{
+	gpio_set(UART_TX_PIN, line_state);
+}
+
+void uart_init(unsigned int idx)
+{
+	gpio_output(UART_TX_PIN, 1);
+}
+
+void uart_tx_byte(unsigned int idx, unsigned char data)
+{
+	uart_bitbang_tx_byte(data, set_tx);
+}
+
+void uart_tx_flush(unsigned int idx)
+{
+	/* unnecessary, PIO Tx means transaction is over when tx_byte returns */
+}
+
+unsigned char uart_rx_byte(unsigned int idx)
+{
+	return 0;	/* not implemented */
+}