tty: Blackin CTS/RTS

Both software emulated and hardware based CTS and RTS are enabled in
serial driver.

The CTS RTS PIN connection on BF548 UART port is defined as a modem
device not as a host device.  In order to test it under Linux, please
nake a cross UART cable to exchange CTS and RTS signal.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/blackfin/mach-bf538/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf538/include/mach/bfin_serial_5xx.h
index 3c2811ebecdd..c536551eb4b8 100644
--- a/arch/blackfin/mach-bf538/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf538/include/mach/bfin_serial_5xx.h
@@ -53,9 +53,9 @@
 #define UART_SET_DLAB(uart)     do { UART_PUT_LCR(uart, UART_GET_LCR(uart) | DLAB); SSYNC(); } while (0)
 #define UART_CLEAR_DLAB(uart)   do { UART_PUT_LCR(uart, UART_GET_LCR(uart) & ~DLAB); SSYNC(); } while (0)
 
-#define UART_GET_CTS(x) gpio_get_value(x->cts_pin)
-#define UART_SET_RTS(x) gpio_set_value(x->rts_pin, 1)
-#define UART_CLEAR_RTS(x) gpio_set_value(x->rts_pin, 0)
+#define UART_GET_CTS(x) (!gpio_get_value(x->cts_pin))
+#define UART_DISABLE_RTS(x) gpio_set_value(x->rts_pin, 1)
+#define UART_ENABLE_RTS(x) gpio_set_value(x->rts_pin, 0)
 #define UART_ENABLE_INTS(x, v) UART_PUT_IER(x, v)
 #define UART_DISABLE_INTS(x) UART_PUT_IER(x, 0)
 
@@ -87,6 +87,7 @@
 struct bfin_serial_port {
         struct uart_port        port;
         unsigned int            old_status;
+        int                     status_irq;
         unsigned int lsr;
 #ifdef CONFIG_SERIAL_BFIN_DMA
         int                     tx_done;
@@ -125,6 +126,7 @@ static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
 struct bfin_serial_res {
         unsigned long   uart_base_addr;
         int             uart_irq;
+        int             uart_status_irq;
 #ifdef CONFIG_SERIAL_BFIN_DMA
         unsigned int    uart_tx_dma_channel;
         unsigned int    uart_rx_dma_channel;
@@ -140,6 +142,7 @@ struct bfin_serial_res bfin_serial_resource[] = {
         {
         0xFFC00400,
         IRQ_UART0_RX,
+        IRQ_UART0_ERROR,
 #ifdef CONFIG_SERIAL_BFIN_DMA
         CH_UART0_TX,
         CH_UART0_RX,
@@ -154,6 +157,7 @@ struct bfin_serial_res bfin_serial_resource[] = {
         {
         0xFFC02000,
         IRQ_UART1_RX,
+        IRQ_UART1_ERROR,
 #ifdef CONFIG_SERIAL_BFIN_DMA
         CH_UART1_TX,
         CH_UART1_RX,