On 05.03.25 11:11, Mykola Kvach wrote:
From: Mykola Kvach <mykola_kv...@epam.com>
The changes have been tested only on the Renesas R-Car-H3 Starter Kit board.
Signed-off-by: Volodymyr Babchuk <volodymyr_babc...@epam.com>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushche...@epam.com>
Signed-off-by: Mykola Kvach <mykola_kv...@epam.com>
---
xen/drivers/char/scif-uart.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/xen/drivers/char/scif-uart.c b/xen/drivers/char/scif-uart.c
index 757793ca45..e166fb0f36 100644
--- a/xen/drivers/char/scif-uart.c
+++ b/xen/drivers/char/scif-uart.c
@@ -139,7 +139,7 @@ static void scif_uart_interrupt(int irq, void *data)
}
}
-static void __init scif_uart_init_preirq(struct serial_port *port)
+static void scif_uart_init_preirq(struct serial_port *port)
{
struct scif_uart *uart = port->uart;
const struct port_params *params = uart->params;
@@ -271,6 +271,33 @@ static void scif_uart_stop_tx(struct serial_port *port)
scif_writew(uart, SCIF_SCSCR, scif_readw(uart, SCIF_SCSCR) & ~SCSCR_TIE);
}
I assume you want ifdef CONFIG_SYSTEM_SUSPEND here also
+static void scif_uart_suspend(struct serial_port *port)
+{
+ struct scif_uart *uart = port->uart;
+
+ scif_uart_stop_tx(port);
+
+ /* Wait until last bit has been transmitted. */
+ while ( !(scif_readw(uart, SCIF_SCFSR) & SCFSR_TEND) );
+
+ /* Disable TX/RX parts and all interrupts */
+ scif_writew(uart, SCIF_SCSCR, 0);
+
+ /* Reset TX/RX FIFOs */
+ scif_writew(uart, SCIF_SCFCR, SCFCR_RFRST | SCFCR_TFRST);
+}
+
+static void scif_uart_resume(struct serial_port *port)
+{
+ struct scif_uart *uart = port->uart;
+
+ scif_uart_init_preirq(port);
+
+ /* Enable TX/RX and Error Interrupts */
+ scif_writew(uart, SCIF_SCSCR, scif_readw(uart, SCIF_SCSCR) |
+ SCSCR_TIE | SCSCR_RIE | SCSCR_REIE);
+}
+
static struct uart_driver __read_mostly scif_uart_driver = {
.init_preirq = scif_uart_init_preirq,
.init_postirq = scif_uart_init_postirq,
@@ -281,6 +308,8 @@ static struct uart_driver __read_mostly scif_uart_driver = {
.start_tx = scif_uart_start_tx,
.stop_tx = scif_uart_stop_tx,
.vuart_info = scif_vuart_info,
+ .suspend = scif_uart_suspend,
+ .resume = scif_uart_resume,
};
static const struct dt_device_match scif_uart_dt_match[] __initconst =
--
Best regards,
-grygorii
