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SubjectRe: [PATCH] Add poll_get_char and poll_put_char uart_ops to atmel_serial.
This patch allows using KGDB over the console with the atmel_serial
driver.

Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
---
Updated patch to use __raw_readl/__raw_writel, as per Haavard's comments.

drivers/serial/atmel_serial.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index 338b15c..1e65046 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -1213,6 +1213,28 @@ static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
return ret;
}

+#ifdef CONFIG_CONSOLE_POLL
+static int atmel_poll_get_char(struct uart_port *port)
+{
+ struct atmel_uart_port *aup = to_atmel_uart_port(port);
+
+ while (!(__raw_readl(aup->uart.membase + ATMEL_US_CSR) & ATMEL_US_RXRDY))
+ barrier();
+
+ return __raw_readl(aup->uart.membase + ATMEL_US_RHR);
+}
+
+static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+ struct atmel_uart_port *aup = to_atmel_uart_port(port);
+
+ while (!(__raw_readl(aup->uart.membase + ATMEL_US_CSR) & ATMEL_US_TXRDY))
+ barrier();
+
+ __raw_writel(ch, aup->uart.membase + ATMEL_US_THR);
+}
+#endif
+
static struct uart_ops atmel_pops = {
.tx_empty = atmel_tx_empty,
.set_mctrl = atmel_set_mctrl,
@@ -1232,6 +1254,10 @@ static struct uart_ops atmel_pops = {
.config_port = atmel_config_port,
.verify_port = atmel_verify_port,
.pm = atmel_serial_pm,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = atmel_poll_get_char,
+ .poll_put_char = atmel_poll_put_char,
+#endif
};

/*
--
Albin Tonnerre, Free Electrons
Kernel, drivers and embedded Linux development,
consulting, training and support.
http://free-electrons.com

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