X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=drivers%2Fserial%2Fbfin_5xx.c;h=18ba812a4f84bc6b3aea2c5818613a811a681387;hb=d307d36adeaa70074773b3e5eab8d7e1beb008a4;hp=318d69dce8e1351f72cf1c100c0eba4b508cf54f;hpb=99793e3dbe39a50d871eedc361659a894601e2bf;p=linux-2.6-omap-h63xx.git

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 318d69dce8e..18ba812a4f8 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -63,7 +63,6 @@ static int kgdboc_break_enabled;
 #define DMA_RX_YCOUNT		(PAGE_SIZE / DMA_RX_XCOUNT)
 
 #define DMA_RX_FLUSH_JIFFIES	(HZ / 50)
-#define CTS_CHECK_JIFFIES	(HZ / 50)
 
 #ifdef CONFIG_SERIAL_BFIN_DMA
 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
@@ -71,10 +70,65 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
 #endif
 
-static void bfin_serial_mctrl_check(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
  */
@@ -111,6 +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
+
 	/*
 	 * To avoid losting RX interrupt, we reset IR function
 	 * before sending data.
@@ -174,10 +235,10 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 			return;
 		}
 
-	if (!uart->port.info || !uart->port.info->tty)
+	if (!uart->port.info || !uart->port.info->port.tty)
 		return;
 #endif
-	tty = uart->port.info->tty;
+	tty = uart->port.info->port.tty;
 
 	if (ANOMALY_05000363) {
 		/* The BF533 (and BF561) family of processors have a nice anomaly
@@ -264,12 +325,6 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 {
 	struct circ_buf *xmit = &uart->port.info->xmit;
 
-	/*
-	 * Check the modem control lines before
-	 * transmitting anything.
-	 */
-	bfin_serial_mctrl_check(uart);
-
 	if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 #ifdef CONFIG_BF54x
 		/* Clear TFI bit */
@@ -312,6 +367,12 @@ static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 {
 	struct bfin_serial_port *uart = dev_id;
 
+#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
 	spin_lock(&uart->port.lock);
 	if (UART_GET_LSR(uart) & THRE)
 		bfin_serial_tx_chars(uart);
@@ -328,12 +389,6 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 
 	uart->tx_done = 0;
 
-	/*
-	 * Check the modem control lines before
-	 * transmitting anything.
-	 */
-	bfin_serial_mctrl_check(uart);
-
 	if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 		uart->tx_count = 0;
 		uart->tx_done = 1;
@@ -401,9 +456,11 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 	else
 		flg = TTY_NORMAL;
 
-	for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
+	for (i = uart->rx_dma_buf.tail; ; i++) {
 		if (i >= UART_XMIT_SIZE)
 			i = 0;
+		if (i == uart->rx_dma_buf.head)
+			break;
 		if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 			uart_insert_char(&uart->port, status, OE,
 				uart->rx_dma_buf.buf[i], flg);
@@ -415,7 +472,8 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 
 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 {
-	int x_pos, pos, flags;
+	int x_pos, pos;
+	unsigned long flags;
 
 	spin_lock_irqsave(&uart->port.lock, flags);
 
@@ -445,6 +503,13 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 	struct bfin_serial_port *uart = dev_id;
 	struct circ_buf *xmit = &uart->port.info->xmit;
 
+#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
+
 	spin_lock(&uart->port.lock);
 	if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 		disable_dma(uart->tx_dma_channel);
@@ -493,61 +558,6 @@ static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 		return 0;
 }
 
-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
-{
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-	if (uart->cts_pin < 0)
-		return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-
-	if (UART_GET_CTS(uart))
-		return TIOCM_DSR | TIOCM_CAR;
-	else
-#endif
-		return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-}
-
-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-	if (uart->rts_pin < 0)
-		return;
-
-	if (mctrl & TIOCM_RTS)
-		UART_CLEAR_RTS(uart);
-	else
-		UART_SET_RTS(uart);
-#endif
-}
-
-/*
- * Handle any change of modem status signal since we were last called.
- */
-static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
-{
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-	unsigned int status;
-	struct uart_info *info = uart->port.info;
-	struct tty_struct *tty = info->port.tty;
-
-	status = bfin_serial_get_mctrl(&uart->port);
-	uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
-	if (!(status & TIOCM_CTS)) {
-		tty->hw_stopped = 1;
-		uart->cts_timer.data = (unsigned long)(uart);
-		uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
-		uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
-		add_timer(&(uart->cts_timer));
-	} else {
-		tty->hw_stopped = 0;
-	}
-#endif
-}
-
-/*
- * Interrupts are always disabled.
- */
 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 {
 	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
@@ -603,7 +613,7 @@ static int bfin_serial_startup(struct uart_port *port)
 	uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 	add_timer(&(uart->rx_dma_timer));
 #else
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 	if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 		kgdboc_break_enabled = 0;
@@ -658,11 +668,50 @@ static int bfin_serial_startup(struct uart_port *port)
 		}
 	}
 # endif
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 	}
 # endif
 #endif
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+	if (uart->cts_pin >= 0) {
+		if (request_irq(gpio_to_irq(uart->cts_pin),
+			bfin_serial_mctrl_cts_int,
+			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+			IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
+			uart->cts_pin = -1;
+			pr_info("Unable to attach BlackFin UART CTS interrupt.\
+				 So, disable it.\n");
+		}
+	}
+	if (uart->rts_pin >= 0) {
+		gpio_request(uart->rts_pin, DRIVER_NAME);
+		gpio_direction_output(uart->rts_pin, 0);
+	}
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	if (request_irq(uart->status_irq,
+		bfin_serial_mctrl_cts_int,
+		IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+		pr_info("Unable to attach BlackFin UART Modem \
+			Status interrupt.\n");
+	}
+
+	if (uart->cts_pin >= 0) {
+		gpio_request(uart->cts_pin, DRIVER_NAME);
+		gpio_direction_output(uart->cts_pin, 1);
+	}
+	if (uart->rts_pin >= 0) {
+		gpio_request(uart->rts_pin, DRIVER_NAME);
+		gpio_direction_output(uart->rts_pin, 0);
+	}
+
+	/* CTS RTS PINs are negative assertive. */
+	UART_PUT_MCR(uart, ACTS);
+	UART_SET_IER(uart, EDSSI);
+#endif
+
 	UART_SET_IER(uart, ERBFI);
 	return 0;
 }
@@ -696,6 +745,21 @@ static void bfin_serial_shutdown(struct uart_port *port)
 	free_irq(uart->port.irq, uart);
 	free_irq(uart->port.irq+1, uart);
 #endif
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+	if (uart->cts_pin >= 0)
+		free_irq(gpio_to_irq(uart->cts_pin), uart);
+	if (uart->rts_pin >= 0)
+		gpio_free(uart->rts_pin);
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	if (uart->cts_pin >= 0)
+		gpio_free(uart->cts_pin);
+	if (uart->rts_pin >= 0)
+		gpio_free(uart->rts_pin);
+	if (UART_GET_IER(uart) && EDSSI)
+		free_irq(uart->status_irq, uart);
+#endif
 }
 
 static void
@@ -757,7 +821,7 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 	}
 
 	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
-	quot = uart_get_divisor(port, baud);
+	quot = uart_get_divisor(port, baud) - ANOMALY_05000230;
 	spin_lock_irqsave(&uart->port.lock, flags);
 
 	UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
@@ -861,6 +925,20 @@ static void bfin_serial_set_ldisc(struct uart_port *port)
 	}
 }
 
+static void bfin_serial_reset_irda(struct uart_port *port)
+{
+	int line = port->line;
+	unsigned short val;
+
+	val = UART_GET_GCTL(&bfin_serial_ports[line]);
+	val &= ~(IREN | RPOLC);
+	UART_PUT_GCTL(&bfin_serial_ports[line], val);
+	SSYNC();
+	val |= (IREN | RPOLC);
+	UART_PUT_GCTL(&bfin_serial_ports[line], val);
+	SSYNC();
+}
+
 #ifdef CONFIG_CONSOLE_POLL
 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 {
@@ -906,20 +984,6 @@ static int bfin_kgdboc_port_startup(struct uart_port *port)
 }
 #endif
 
-static void bfin_serial_reset_irda(struct uart_port *port)
-{
-	int line = port->line;
-	unsigned short val;
-
-	val = UART_GET_GCTL(&bfin_serial_ports[line]);
-	val &= ~(IREN | RPOLC);
-	UART_PUT_GCTL(&bfin_serial_ports[line], val);
-	SSYNC();
-	val |= (IREN | RPOLC);
-	UART_PUT_GCTL(&bfin_serial_ports[line], val);
-	SSYNC();
-}
-
 static struct uart_ops bfin_serial_pops = {
 	.tx_empty	= bfin_serial_tx_empty,
 	.set_mctrl	= bfin_serial_set_mctrl,
@@ -949,6 +1013,39 @@ static struct uart_ops bfin_serial_pops = {
 #endif
 };
 
+static void __init bfin_serial_hw_init(void)
+{
+#ifdef CONFIG_SERIAL_BFIN_UART0
+	peripheral_request(P_UART0_TX, DRIVER_NAME);
+	peripheral_request(P_UART0_RX, DRIVER_NAME);
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_UART1
+	peripheral_request(P_UART1_TX, DRIVER_NAME);
+	peripheral_request(P_UART1_RX, DRIVER_NAME);
+
+# if defined(CONFIG_BFIN_UART1_CTSRTS) && defined(CONFIG_BF54x)
+	peripheral_request(P_UART1_RTS, DRIVER_NAME);
+	peripheral_request(P_UART1_CTS, DRIVER_NAME);
+# endif
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_UART2
+	peripheral_request(P_UART2_TX, DRIVER_NAME);
+	peripheral_request(P_UART2_RX, DRIVER_NAME);
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_UART3
+	peripheral_request(P_UART3_TX, DRIVER_NAME);
+	peripheral_request(P_UART3_RX, DRIVER_NAME);
+
+# if defined(CONFIG_BFIN_UART3_CTSRTS) && defined(CONFIG_BF54x)
+	peripheral_request(P_UART3_RTS, DRIVER_NAME);
+	peripheral_request(P_UART3_CTS, DRIVER_NAME);
+# endif
+#endif
+}
+
 static void __init bfin_serial_init_ports(void)
 {
 	static int first = 1;
@@ -958,6 +1055,8 @@ static void __init bfin_serial_init_ports(void)
 		return;
 	first = 0;
 
+	bfin_serial_hw_init();
+
 	for (i = 0; i < nr_active_ports; i++) {
 		bfin_serial_ports[i].port.uartclk   = get_sclk();
 		bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
@@ -970,6 +1069,8 @@ static void __init bfin_serial_init_ports(void)
 			bfin_serial_resource[i].uart_base_addr;
 		bfin_serial_ports[i].port.irq       =
 			bfin_serial_resource[i].uart_irq;
+		bfin_serial_ports[i].status_irq	    =
+			bfin_serial_resource[i].uart_status_irq;
 		bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 #ifdef CONFIG_SERIAL_BFIN_DMA
 		bfin_serial_ports[i].tx_done	    = 1;
@@ -980,16 +1081,14 @@ static void __init bfin_serial_init_ports(void)
 			bfin_serial_resource[i].uart_rx_dma_channel;
 		init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 #endif
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-		init_timer(&(bfin_serial_ports[i].cts_timer));
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+	defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
 		bfin_serial_ports[i].cts_pin	    =
 			bfin_serial_resource[i].uart_cts_pin;
 		bfin_serial_ports[i].rts_pin	    =
 			bfin_serial_resource[i].uart_rts_pin;
 #endif
-		bfin_serial_hw_init(&bfin_serial_ports[i]);
 	}
-
 }
 
 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
@@ -1046,7 +1145,8 @@ bfin_serial_console_setup(struct console *co, char *options)
 	int baud = 57600;
 	int bits = 8;
 	int parity = 'n';
-# ifdef CONFIG_SERIAL_BFIN_CTSRTS
+# if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+	defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
 	int flow = 'r';
 # else
 	int flow = 'n';
@@ -1088,7 +1188,7 @@ static void
 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
-	int flags = 0;
+	unsigned long flags;
 
 	spin_lock_irqsave(&uart->port.lock, flags);
 	uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
@@ -1243,7 +1343,8 @@ static int bfin_serial_remove(struct platform_device *dev)
 			continue;
 		uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
 		bfin_serial_ports[i].port.dev = NULL;
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+	defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
 		gpio_free(bfin_serial_ports[i].cts_pin);
 		gpio_free(bfin_serial_ports[i].rts_pin);
 #endif