tty: Blackin CTS/RTS

d307d36a · Sonic Zhang <[email protected]> · 2009-04-07 16:52:26 +01:00

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 <[email protected]>
Signed-off-by: Bryan Wu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Alan Cox <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: d307d36adeaa70074773b3e5eab8d7e1beb008a4
Parents: 6f95570e

Changes

9 files changed · +209 −116

File	Status	Add	Del	Content
arch/blackfin/mach-bf518/include/mach/bfin_serial_5xx.h	modified	+7	−3	View file
arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h	modified	+7	−3	View file
arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h	modified	+6	−3	View file
arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h	modified	+7	−3	View file
arch/blackfin/mach-bf538/include/mach/bfin_serial_5xx.h	modified	+7	−3	View file
arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h	modified	+32	−40	View file
arch/blackfin/mach-bf561/include/mach/bfin_serial_5xx.h	modified	+6	−3	View file
drivers/serial/Kconfig	modified	+20	−6	View file
drivers/serial/bfin_5xx.c	modified	+117	−52	View file

Only the first 600 diff lines are shown. Download the complete patch.

arch/blackfin/mach-bf518/include/mach/bfin_serial_5xx.h

View file

diff --git a/arch/blackfin/mach-bf518/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf518/include/mach/bfin_serial_5xx.h
index e21c1c3..0fb2ce5 100644
--- a/arch/blackfin/mach-bf518/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf518/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,

arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h

View file

diff --git a/arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h
index d2b160c..a625659 100644
--- a/arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf527/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,

arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h

View file

diff --git a/arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h
index 70356dd..a3789d7 100644
--- a/arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf533/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)
 
@@ -74,6 +74,7 @@
 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;
@@ -116,6 +117,7 @@ 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;
@@ -130,6 +132,7 @@ struct bfin_serial_res bfin_serial_resource[] = {
 	{
 	0xFFC00400,
 	IRQ_UART_RX,
+	IRQ_UART_ERROR,
 #ifdef CONFIG_SERIAL_BFIN_DMA
 	CH_UART_TX,
 	CH_UART_RX,

arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h

View file

diff --git a/arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h
index d46fc4f..b86662f 100644
--- a/arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf537/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;
@@ -124,6 +125,7 @@ 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;
@@ -139,6 +141,7 @@ 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,
@@ -153,6 +156,7 @@ 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,

arch/blackfin/mach-bf538/include/mach/bfin_serial_5xx.h

View file

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 3c2811e..c536551 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,

arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h

View file

diff --git a/arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h
index 388e232..2d1b5fa 100644
--- a/arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h
@@ -46,41 +46,27 @@
 #define UART_PUT_CHAR(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_THR),v)
 #define UART_PUT_DLL(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
 #define UART_SET_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER_SET),v)
-#define UART_CLEAR_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER_CLEAR),v)
+#define UART_CLEAR_IER(uart,v)  bfin_write16(((uart)->port.membase + OFFSET_IER_CLEAR),v)
 #define UART_PUT_DLH(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
 #define UART_PUT_LSR(uart,v)	bfin_write16(((uart)->port.membase + OFFSET_LSR),v)
 #define UART_PUT_LCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
 #define UART_CLEAR_LSR(uart)    bfin_write16(((uart)->port.membase + OFFSET_LSR), -1)
 #define UART_PUT_GCTL(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
 #define UART_PUT_MCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_MCR),v)
+#define UART_CLEAR_SCTS(uart)   bfin_write16(((uart)->port.membase + OFFSET_MSR),SCTS)
 
 #define UART_SET_DLAB(uart)     /* MMRs not muxed on BF54x */
 #define UART_CLEAR_DLAB(uart)   /* MMRs not muxed on BF54x */
 
 #define UART_GET_CTS(x) (UART_GET_MSR(x) & CTS)
-#define UART_SET_RTS(x) (UART_PUT_MCR(x, UART_GET_MCR(x) | MRTS))
-#define UART_CLEAR_RTS(x) (UART_PUT_MCR(x, UART_GET_MCR(x) & ~MRTS))
+#define UART_DISABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) & ~(ARTS|MRTS))
+#define UART_ENABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) | MRTS | ARTS)
 #define UART_ENABLE_INTS(x, v) UART_SET_IER(x, v)
 #define UART_DISABLE_INTS(x) UART_CLEAR_IER(x, 0xF)
 
-#if defined(CONFIG_BFIN_UART0_CTSRTS) || defined(CONFIG_BFIN_UART2_CTSRTS)
-# define CONFIG_SERIAL_BFIN_CTSRTS
-
-# ifndef CONFIG_UART0_CTS_PIN
-#  define CONFIG_UART0_CTS_PIN -1
-# endif
-
-# ifndef CONFIG_UART0_RTS_PIN
-#  define CONFIG_UART0_RTS_PIN -1
-# endif
-
-# ifndef CONFIG_UART2_CTS_PIN
-#  define CONFIG_UART2_CTS_PIN -1
-# endif
-
-# ifndef CONFIG_UART2_RTS_PIN
-#  define CONFIG_UART2_RTS_PIN -1
-# endif
+#if defined(CONFIG_BFIN_UART0_CTSRTS) || defined(CONFIG_BFIN_UART1_CTSRTS) || \
+	defined(CONFIG_BFIN_UART2_CTSRTS) || defined(CONFIG_BFIN_UART3_CTSRTS)
+# define CONFIG_SERIAL_BFIN_HARD_CTSRTS
 #endif
 
 #define BFIN_UART_TX_FIFO_SIZE	2
@@ -91,6 +77,7 @@
 struct bfin_serial_port {
         struct uart_port        port;
         unsigned int            old_status;
+	int			status_irq;
 #ifdef CONFIG_SERIAL_BFIN_DMA
 	int			tx_done;
 	int			tx_count;
@@ -101,23 +88,24 @@ struct bfin_serial_port {
 	unsigned int		rx_dma_channel;
 	struct work_struct	tx_dma_workqueue;
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	struct timer_list 	cts_timer;
-	int		cts_pin;
-	int 		rts_pin;
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	int			scts;
+	int			cts_pin;
+	int			rts_pin;
 #endif
 };
 
 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;
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	int	uart_cts_pin;
-	int	uart_rts_pin;
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	int		uart_cts_pin;
+	int		uart_rts_pin;
 #endif
 };
 
@@ -126,13 +114,14 @@ 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,
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	CONFIG_UART0_CTS_PIN,
-	CONFIG_UART0_RTS_PIN,
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	0,
+	0,
 #endif
 	},
 #endif
@@ -140,13 +129,14 @@ 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,
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	0,
-	0,
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	GPIO_PE10,
+	GPIO_PE9,
 #endif
 	},
 #endif
@@ -154,13 +144,14 @@ struct bfin_serial_res bfin_serial_resource[] = {
 	{
 	0xFFC02100,
 	IRQ_UART2_RX,
+	IRQ_UART2_ERROR,
 #ifdef CONFIG_SERIAL_BFIN_DMA
 	CH_UART2_TX,
 	CH_UART2_RX,
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	CONFIG_UART2_CTS_PIN,
-	CONFIG_UART2_RTS_PIN,
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	0,
+	0,
 #endif
 	},
 #endif
@@ -168,13 +159,14 @@ struct bfin_serial_res bfin_serial_resource[] = {
 	{
 	0xFFC03100,
 	IRQ_UART3_RX,
+	IRQ_UART3_ERROR,
 #ifdef CONFIG_SERIAL_BFIN_DMA
 	CH_UART3_TX,
 	CH_UART3_RX,
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	0,
-	0,
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	GPIO_PB3,
+	GPIO_PB2,
 #endif
 	},
 #endif

arch/blackfin/mach-bf561/include/mach/bfin_serial_5xx.h

View file

diff --git a/arch/blackfin/mach-bf561/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf561/include/mach/bfin_serial_5xx.h
index d0469e3..a1b5087 100644
--- a/arch/blackfin/mach-bf561/include/mach/bfin_serial_5xx.h
+++ b/arch/blackfin/mach-bf561/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)
 
@@ -74,6 +74,7 @@
 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;
@@ -116,6 +117,7 @@ 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;
@@ -130,6 +132,7 @@ struct bfin_serial_res bfin_serial_resource[] = {
 	{
 	0xFFC00400,
 	IRQ_UART_RX,
+	IRQ_UART_ERROR,
 #ifdef CONFIG_SERIAL_BFIN_DMA
 	CH_UART_TX,
 	CH_UART_RX,

drivers/serial/Kconfig

View file

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index d89972b..f2e5736 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -734,7 +734,7 @@ config BFIN_UART0_CTSRTS
 
 config UART0_CTS_PIN
 	int "UART0 CTS pin"
-	depends on BFIN_UART0_CTSRTS
+	depends on BFIN_UART0_CTSRTS && !BF548
 	default 23
 	help
 	  The default pin is GPIO_GP7.
@@ -742,7 +742,7 @@ config UART0_CTS_PIN
 
 config UART0_RTS_PIN
 	int "UART0 RTS pin"
-	depends on BFIN_UART0_CTSRTS
+	depends on BFIN_UART0_CTSRTS && !BF548
 	default 22
 	help
 	  The default pin is GPIO_GP6.
@@ -763,14 +763,14 @@ config BFIN_UART1_CTSRTS
 
 config UART1_CTS_PIN
 	int "UART1 CTS pin"
-	depends on BFIN_UART1_CTSRTS && !BF54x
+	depends on BFIN_UART1_CTSRTS && !BF548
 	default -1
 	help
 	  Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
 
 config UART1_RTS_PIN
 	int "UART1 RTS pin"
-	depends on BFIN_UART1_CTSRTS && !BF54x
+	depends on BFIN_UART1_CTSRTS && !BF548
 	default -1
 	help
 	  Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
@@ -790,14 +790,14 @@ config BFIN_UART2_CTSRTS
 
 config UART2_CTS_PIN
 	int "UART2 CTS pin"
-	depends on BFIN_UART2_CTSRTS
+	depends on BFIN_UART2_CTSRTS && !BF548
 	default -1
 	help
 	  Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
 
 config UART2_RTS_PIN
 	int "UART2 RTS pin"
-	depends on BFIN_UART2_CTSRTS
+	depends on BFIN_UART2_CTSRTS && !BF548
 	default -1
 	help
 	  Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
@@ -815,6 +815,20 @@ config BFIN_UART3_CTSRTS
 	  Enable hardware flow control in the driver. Using GPIO emulate the CTS/RTS
 	  signal.
 
+config UART3_CTS_PIN
+	int "UART3 CTS pin"
+	depends on BFIN_UART3_CTSRTS && !BF548
+	default -1
+	help
+	  Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
+
+config UART3_RTS_PIN
+	int "UART3 RTS pin"
+	depends on BFIN_UART3_CTSRTS && !BF548
+	default -1
+	help
+	  Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
+
 config SERIAL_IMX
 	bool "IMX serial port support"
 	depends on ARM && (ARCH_IMX || ARCH_MXC)

drivers/serial/bfin_5xx.c

View file

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index fbbddb9..18ba812 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -72,6 +72,63 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
 
 static void bfin_serial_reset_irda(struct uart_port *port);
 
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+	defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
+{
+	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+	if (uart->cts_pin < 0)
+		return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+	/* CTS PIN is negative assertive. */
+	if (UART_GET_CTS(uart))
+		return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+	else
+		return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+	if (uart->rts_pin < 0)
+		return;
+
+	/* RTS PIN is negative assertive. */
+	if (mctrl & TIOCM_RTS)
+		UART_ENABLE_RTS(uart);
+	else
+		UART_DISABLE_RTS(uart);
+}
+
+/*
+ * Handle any change of modem status signal.
+ */
+static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
+{
+	struct bfin_serial_port *uart = dev_id;
+	unsigned int status;
+
+	status = bfin_serial_get_mctrl(&uart->port);
+	uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	uart->scts = 1;
+	UART_CLEAR_SCTS(uart);
+	UART_CLEAR_IER(uart, EDSSI);
+#endif
+
+	return IRQ_HANDLED;
+}
+#else
+static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+#endif
+
 /*
  * interrupts are disabled on entry
  */
@@ -108,6 +165,13 @@ static void bfin_serial_start_tx(struct uart_port *port)
 	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 	struct tty_struct *tty = uart->port.info->port.tty;
 
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	if (uart->scts && (!bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
+		uart->scts = 0;
+		uart_handle_cts_change(&uart->port, uart->scts);
+	}
+#endif
+
 	/*

This diff is incomplete. Download the complete patch.