serial: bfin_sport_uart: add support for CTS/RTS via GPIOs

Some people need flow control on their ports, so now boards can support
that via any GPIOs.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 135 insertions, 11 deletions

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 302836a80693..63258305c057 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -1443,24 +1443,48 @@ config SERIAL_BFIN_SPORT0_UART
         help
           Enable UART over SPORT0
 
+config SERIAL_BFIN_SPORT0_UART_CTSRTS
+        bool "Enable UART over SPORT0 hardware flow control"
+        depends on SERIAL_BFIN_SPORT0_UART
+        help
+          Enable hardware flow control in the driver.
+
 config SERIAL_BFIN_SPORT1_UART
         bool "Enable UART over SPORT1"
         depends on SERIAL_BFIN_SPORT
         help
           Enable UART over SPORT1
 
+config SERIAL_BFIN_SPORT1_UART_CTSRTS
+        bool "Enable UART over SPORT1 hardware flow control"
+        depends on SERIAL_BFIN_SPORT1_UART
+        help
+          Enable hardware flow control in the driver.
+
 config SERIAL_BFIN_SPORT2_UART
         bool "Enable UART over SPORT2"
         depends on SERIAL_BFIN_SPORT && (BF54x || BF538 || BF539)
         help
           Enable UART over SPORT2
 
+config SERIAL_BFIN_SPORT2_UART_CTSRTS
+        bool "Enable UART over SPORT2 hardware flow control"
+        depends on SERIAL_BFIN_SPORT2_UART
+        help
+          Enable hardware flow control in the driver.
+
 config SERIAL_BFIN_SPORT3_UART
         bool "Enable UART over SPORT3"
         depends on SERIAL_BFIN_SPORT && (BF54x || BF538 || BF539)
         help
           Enable UART over SPORT3
 
+config SERIAL_BFIN_SPORT3_UART_CTSRTS
+        bool "Enable UART over SPORT3 hardware flow control"
+        depends on SERIAL_BFIN_SPORT3_UART
+        help
+          Enable hardware flow control in the driver.
+
 config SERIAL_TIMBERDALE
         tristate "Support for timberdale UART"
         select SERIAL_CORE
diff --git a/drivers/serial/bfin_sport_uart.c b/drivers/serial/bfin_sport_uart.c
index 79252664f706..8cb0a40c2baa 100644
--- a/drivers/serial/bfin_sport_uart.c
+++ b/drivers/serial/bfin_sport_uart.c
@@ -48,6 +48,10 @@ struct sport_uart_port {
         unsigned short          txmask2;
         unsigned char           stopb;
 /*      unsigned char           parib; */
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        int cts_pin;
+        int rts_pin;
+#endif
 };
 
 static void sport_uart_tx_chars(struct sport_uart_port *up);
@@ -198,6 +202,59 @@ static irqreturn_t sport_uart_err_irq(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+static unsigned int sport_get_mctrl(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        if (up->cts_pin < 0)
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+        /* CTS PIN is negative assertive. */
+        if (SPORT_UART_GET_CTS(up))
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+        else
+                return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        if (up->rts_pin < 0)
+                return;
+
+        /* RTS PIN is negative assertive. */
+        if (mctrl & TIOCM_RTS)
+                SPORT_UART_ENABLE_RTS(up);
+        else
+                SPORT_UART_DISABLE_RTS(up);
+}
+
+/*
+ * Handle any change of modem status signal.
+ */
+static irqreturn_t sport_mctrl_cts_int(int irq, void *dev_id)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)dev_id;
+        unsigned int status;
+
+        status = sport_get_mctrl(&up->port);
+        uart_handle_cts_change(&up->port, status & TIOCM_CTS);
+
+        return IRQ_HANDLED;
+}
+#else
+static unsigned int sport_get_mctrl(struct uart_port *port)
+{
+        pr_debug("%s enter\n", __func__);
+        return TIOCM_CTS | TIOCM_CD | TIOCM_DSR;
+}
+
+static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        pr_debug("%s enter\n", __func__);
+}
+#endif
+
 /* Reqeust IRQ, Setup clock */
 static int sport_startup(struct uart_port *port)
 {
@@ -226,6 +283,21 @@ static int sport_startup(struct uart_port *port)
                 goto fail2;
         }
 
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        if (up->cts_pin >= 0) {
+                if (request_irq(gpio_to_irq(up->cts_pin),
+                        sport_mctrl_cts_int,
+                        IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                        IRQF_DISABLED, "BFIN_SPORT_UART_CTS", up)) {
+                        up->cts_pin = -1;
+                        dev_info(port->dev, "Unable to attach BlackFin UART \
+                                over SPORT CTS interrupt. So, disable it.\n");
+                }
+        }
+        if (up->rts_pin >= 0)
+                gpio_direction_output(up->rts_pin, 0);
+#endif
+
         return 0;
  fail2:
         free_irq(up->port.irq+1, up);
@@ -283,17 +355,6 @@ static unsigned int sport_tx_empty(struct uart_port *port)
                 return 0;
 }
 
-static unsigned int sport_get_mctrl(struct uart_port *port)
-{
-        pr_debug("%s enter\n", __func__);
-        return (TIOCM_CTS | TIOCM_CD | TIOCM_DSR);
-}
-
-static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-        pr_debug("%s enter\n", __func__);
-}
-
 static void sport_stop_tx(struct uart_port *port)
 {
         struct sport_uart_port *up = (struct sport_uart_port *)port;
@@ -364,6 +425,10 @@ static void sport_shutdown(struct uart_port *port)
         free_irq(up->port.irq, up);
         free_irq(up->port.irq+1, up);
         free_irq(up->err_irq, up);
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        if (up->cts_pin >= 0)
+                free_irq(gpio_to_irq(up->cts_pin), up);
+#endif
 }
 
 static const char *sport_type(struct uart_port *port)
@@ -536,7 +601,11 @@ sport_uart_console_setup(struct console *co, char *options)
         int baud = 57600;
         int bits = 8;
         int parity = 'n';
+# ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        int flow = 'r';
+# else
         int flow = 'n';
+# endif
 
         /* Check whether an invalid uart number has been specified */
         if (co->index < 0 || co->index >= BFIN_SPORT_UART_MAX_PORTS)
@@ -729,6 +798,22 @@ static int __devinit sport_uart_probe(struct platform_device *pdev)
                         ret = -ENOENT;
                         goto out_error_unmap;
                 }
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+                res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+                if (res == NULL)
+                        sport->cts_pin = -1;
+                else
+                        sport->cts_pin = res->start;
+
+                res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+                if (res == NULL)
+                        sport->rts_pin = -1;
+                else
+                        sport->rts_pin = res->start;
+
+                if (sport->rts_pin >= 0)
+                        gpio_request(sport->rts_pin, DRV_NAME);
+#endif
         }
 
 #ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
@@ -767,6 +852,10 @@ static int __devexit sport_uart_remove(struct platform_device *pdev)
 
         if (sport) {
                 uart_remove_one_port(&sport_uart_reg, &sport->port);
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+                if (sport->rts_pin >= 0)
+                        gpio_free(sport->rts_pin);
+#endif
                 iounmap(sport->port.membase);
                 peripheral_free_list(
                         (unsigned short *)pdev->dev.platform_data);
diff --git a/drivers/serial/bfin_sport_uart.h b/drivers/serial/bfin_sport_uart.h
index 9791fcc80a74..9ce253e381d2 100644
--- a/drivers/serial/bfin_sport_uart.h
+++ b/drivers/serial/bfin_sport_uart.h
@@ -72,4 +72,15 @@
 
 #define SPORT_TX_FIFO_SIZE      8
 
+#define SPORT_UART_GET_CTS(x)           gpio_get_value(x->cts_pin)
+#define SPORT_UART_DISABLE_RTS(x)       gpio_set_value(x->rts_pin, 1)
+#define SPORT_UART_ENABLE_RTS(x)        gpio_set_value(x->rts_pin, 0)
+
+#if defined(CONFIG_SERIAL_BFIN_SPORT0_UART_CTSRTS) \
+        || defined(CONFIG_SERIAL_BFIN_SPORT1_UART_CTSRTS) \
+        || defined(CONFIG_SERIAL_BFIN_SPORT2_UART_CTSRTS) \
+        || defined(CONFIG_SERIAL_BFIN_SPORT3_UART_CTSRTS)
+# define CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+#endif
+
 #endif /* _BFIN_SPORT_UART_H */