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authorLanqing Liu <liuhhome@gmail.com>2019-09-19 11:10:37 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-10-04 14:50:01 +0200
commit39f809192661be91fabc3ee77c2e15f9123c11cf (patch)
treea7f472940490996f1c68db09c4fa3db338a9f1f0 /drivers/tty
parent76c38d30fee7907289c1951e6dc6e10ead12f4e1 (diff)
serial: sprd: Add polling IO support
In order to access the UART without the interrupts, the kernel uses the basic polling methods for IO with the device. With these methods implemented, it is now possible to enable kgdb during early boot over serial. Signed-off-by: Lanqing Liu <liuhhome@gmail.com> Reviewed-by: Baolin Wang <baolin.wang@linaro.org> Tested-by: Baolin Wang <baolin.wang@linaro.org> Link: https://lore.kernel.org/r/f112a741c053ac5fb0637e2f058be81e17f78ccc.1568862391.git.liuhhome@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sprd_serial.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 771d11196523..31df23502562 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -919,6 +919,34 @@ static void sprd_pm(struct uart_port *port, unsigned int state,
}
}
+#ifdef CONFIG_CONSOLE_POLL
+static int sprd_poll_init(struct uart_port *port)
+{
+ if (port->state->pm_state != UART_PM_STATE_ON) {
+ sprd_pm(port, UART_PM_STATE_ON, 0);
+ port->state->pm_state = UART_PM_STATE_ON;
+ }
+
+ return 0;
+}
+
+static int sprd_poll_get_char(struct uart_port *port)
+{
+ while (!(serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK))
+ cpu_relax();
+
+ return serial_in(port, SPRD_RXD);
+}
+
+static void sprd_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+ while (serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
+ cpu_relax();
+
+ serial_out(port, SPRD_TXD, ch);
+}
+#endif
+
static const struct uart_ops serial_sprd_ops = {
.tx_empty = sprd_tx_empty,
.get_mctrl = sprd_get_mctrl,
@@ -936,6 +964,11 @@ static const struct uart_ops serial_sprd_ops = {
.config_port = sprd_config_port,
.verify_port = sprd_verify_port,
.pm = sprd_pm,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_init = sprd_poll_init,
+ .poll_get_char = sprd_poll_get_char,
+ .poll_put_char = sprd_poll_put_char,
+#endif
};
#ifdef CONFIG_SERIAL_SPRD_CONSOLE