Merge baythorne.infradead.org:/inst/bk/hsserial-2.5

into hera.kernel.org:/home/dwmw2/BK/uart-2.5

drivers/serial/21285.c

@@ -237,7 +237,7 @@ serial21285_set_termios(struct uart_port *port, struct termios *termios,
 			struct termios *old)
 {
 	unsigned long flags;
-	unsigned int quot, h_lcr;
+	unsigned int baud, quot, h_lcr;
 
 	/*
 	 * We don't support modem control lines.
@@ -253,7 +253,8 @@ serial21285_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -286,7 +287,7 @@ serial21285_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	/*
 	 * Which character status flags are we interested in?

drivers/serial/8250.c

@@ -159,7 +159,8 @@ static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
 	{ "16C950/954",	128,	UART_CLEAR_FIFO | UART_USE_FIFO },
 	{ "ST16654",	64,	UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
 	{ "XR16850",	128,	UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
-	{ "RSA",	2048,	UART_CLEAR_FIFO | UART_USE_FIFO }
+	{ "RSA",	2048,	UART_CLEAR_FIFO | UART_USE_FIFO },
+	{ "NS16550A",	16,	UART_CLEAR_FIFO | UART_USE_FIFO | UART_NATSEMI }
 };
 
 static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
@@ -481,6 +482,40 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 		return;
 	}
 
+	/*
+	 * Check for a National Semiconductor SuperIO chip.
+	 * Attempt to switch to bank 2, read the value of the LOOP bit
+	 * from EXCR1. Switch back to bank 0, change it in MCR. Then
+	 * switch back to bank 2, read it from EXCR1 again and check
+	 * it's changed. If so, set baud_base in EXCR2 to 921600.
+	 */
+	serial_outp(up, UART_LCR, 0);
+	status1 = serial_in(up, UART_MCR);
+	serial_outp(up, UART_LCR, 0xE0);
+	status2 = serial_in(up, 0x02); /* EXCR1 */
+
+	if (!((status2 ^ status1) & UART_MCR_LOOP)) {
+		serial_outp(up, UART_LCR, 0);
+		serial_outp(up, UART_MCR, status1 ^ UART_MCR_LOOP);
+		serial_outp(up, UART_LCR, 0xE0);
+		status2 = serial_in(up, 0x02); /* EXCR1 */
+		serial_outp(up, UART_LCR, 0);
+		serial_outp(up, UART_MCR, status1);
+
+		if ((status2 ^ status1) & UART_MCR_LOOP) {
+			serial_outp(up, UART_LCR, 0xE0);
+			status1 = serial_in(up, 0x04); /* EXCR1 */
+			status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
+			status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
+			serial_outp(up, 0x04, status1);
+			serial_outp(up, UART_LCR, 0);
+
+			up->port.type = PORT_NS16550A;
+			up->port.uartclk = 921600*16;
+			return;
+		}
+	}
+
 	/*
 	 * No EFR.  Try to detect a TI16750, which only sets bit 5 of
 	 * the IIR when 64 byte FIFO mode is enabled when DLAB is set.
@@ -1318,6 +1353,26 @@ static void serial8250_shutdown(struct uart_port *port)
 		serial_unlink_irq_chain(up);
 }
 
+static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud)
+{
+	unsigned int quot;
+
+	/*
+	 * Handle magic divisors for baud rates above baud_base on
+	 * SMSC SuperIO chips.
+	 */
+	if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
+	    baud == (port->uartclk/4))
+		quot = 0x8001;
+	else if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
+		 baud == (port->uartclk/8))
+		quot = 0x8002;
+	else
+		quot = uart_get_divisor(port, baud);
+
+	return quot;
+}
+
 static void
 serial8250_set_termios(struct uart_port *port, struct termios *termios,
 		       struct termios *old)
@@ -1325,7 +1380,7 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 	unsigned char cval, fcr = 0;
 	unsigned long flags;
-	unsigned int quot;
+	unsigned int baud, quot;
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -1357,7 +1412,8 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = serial8250_get_divisor(port, baud);
 
 	/*
 	 * Work around a bug in the Oxford Semiconductor 952 rev B
@@ -1369,7 +1425,7 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 		quot ++;
 
 	if (uart_config[up->port.type].flags & UART_USE_FIFO) {
-		if ((up->port.uartclk / quot) < (2400 * 16))
+		if (baud < 2400)
 			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
 #ifdef CONFIG_SERIAL_8250_RSA
 		else if (up->port.type == PORT_RSA)
@@ -1390,7 +1446,7 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 	if (termios->c_iflag & INPCK)
@@ -1434,7 +1490,13 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 		serial_outp(up, UART_EFR,
 			    termios->c_cflag & CRTSCTS ? UART_EFR_CTS :0);
 	}
-	serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+
+	if (uart_config[up->port.type].flags & UART_NATSEMI) {
+		/* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */
+		serial_outp(up, UART_LCR, 0xe0);
+	} else {
+		serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+	}
 	serial_outp(up, UART_DLL, quot & 0xff);		/* LS of divisor */
 	serial_outp(up, UART_DLM, quot >> 8);		/* MS of divisor */
 	if (up->port.type == PORT_16750)

drivers/serial/amba.c

@@ -408,12 +408,13 @@ ambauart_set_termios(struct uart_port *port, struct termios *termios,
 {
 	unsigned int lcr_h, old_cr;
 	unsigned long flags;
-	unsigned int quot;
+	unsigned int baud, quot;
 
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -444,7 +445,7 @@ ambauart_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	port->read_status_mask = AMBA_UARTRSR_OE;
 	if (termios->c_iflag & INPCK)

drivers/serial/anakin.c

@@ -287,7 +287,7 @@ anakin_set_termios(struct uart_port *port, struct termios *termios,
 		   struct termios *old)
 {
 	unsigned long flags;
-	unsigned int quot;
+	unsigned int baud, quot;
 
 	/*
 	 * We don't support parity, stop bits, or anything other
@@ -304,11 +304,12 @@ anakin_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	spin_lock_irqsave(&port->lock, flags);
 
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	while (!(anakin_in(port, 0x10) & TXEMPTY))
 		barrier();

drivers/serial/clps711x.c

@@ -320,7 +320,7 @@ static void
 clps711xuart_set_termios(struct uart_port *port, struct termios *termios,
 			 struct termios *old)
 {
-	unsigned int ubrlcr, quot;
+	unsigned int ubrlcr, baud, quot;
 	unsigned long flags;
 
 	/*
@@ -331,7 +331,8 @@ clps711xuart_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -362,7 +363,7 @@ clps711xuart_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	port->read_status_mask = UARTDR_OVERR;
 	if (termios->c_iflag & INPCK)

drivers/serial/core.c

@@ -271,7 +271,7 @@ static void uart_shutdown(struct uart_info *info)
  */
 void
 uart_update_timeout(struct uart_port *port, unsigned int cflag,
-		    unsigned int quot)
+		    unsigned int baud)
 {
 	unsigned int bits;
 
@@ -305,7 +305,7 @@ uart_update_timeout(struct uart_port *port, unsigned int cflag,
 	 * Figure the timeout to send the above number of bits.
 	 * Add .02 seconds of slop
 	 */
-	port->timeout = (HZ * bits) / (port->uartclk / (16 * quot)) + HZ/50;
+	port->timeout = (HZ * bits) / baud + HZ/50;
 }
 
 EXPORT_SYMBOL(uart_update_timeout);
@@ -321,6 +321,12 @@ EXPORT_SYMBOL(uart_update_timeout);
  *	Decode the termios structure into a numeric baud rate,
  *	taking account of the magic 38400 baud rate (with spd_*
  *	flags), and mapping the %B0 rate to 9600 baud.
+ *
+ *	If the new baud rate is invalid, try the old termios setting.
+ *	If it's still invalid, we try 9600 baud.
+ *
+ *	Update the @termios structure to reflect the baud rate
+ *	we're actually going to be using.
  */
 unsigned int
 uart_get_baud_rate(struct uart_port *port, struct termios *termios,
@@ -383,26 +389,14 @@ EXPORT_SYMBOL(uart_get_baud_rate);
 /**
  *	uart_get_divisor - return uart clock divisor
  *	@port: uart_port structure describing the port.
- *	@termios: desired termios settings
- *	@old_termios: the original port settings, or NULL
- *
- *	Calculate the uart clock divisor for the port.  If the
- *	divisor is invalid, try the old termios setting.  If
- *	the divisor is still invalid, we try 9600 baud.
+ *	@baud: desired baud rate
  *
- *	Update the @termios structure to reflect the baud rate
- *	we're actually going to be using.
- *
- *	If 9600 baud fails, we return a zero divisor.
+ *	Calculate the uart clock divisor for the port.
  */
 unsigned int
-uart_get_divisor(struct uart_port *port, struct termios *termios,
-		 struct termios *old_termios)
+uart_get_divisor(struct uart_port *port, unsigned int baud)
 {
-	unsigned int quot, baud, max = port->uartclk / 16;
-
-	/* Determine divisor based on baud rate */
-	baud = uart_get_baud_rate(port, termios, old_termios, 0, max);
+	unsigned int quot;
 
 	/*
 	 * Old custom speed handling.
@@ -832,8 +826,17 @@ uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
 		goto exit;
 	if (info->flags & UIF_INITIALIZED) {
 		if (((old_flags ^ port->flags) & UPF_SPD_MASK) ||
-		    old_custom_divisor != port->custom_divisor)
+		    old_custom_divisor != port->custom_divisor) {
+			/* If they're setting up a custom divisor or speed,
+			 * instead of clearing it, then bitch about it. No
+			 * need to rate-limit; it's CAP_SYS_ADMIN only. */
+			if (port->flags & UPF_SPD_MASK) {
+				printk(KERN_NOTICE "%s sets custom speed on %s%d. This is deprecated.\n",
+				       current->comm, info->tty->driver.name, 
+				       info->port->line);
+			}
 			uart_change_speed(info, NULL);
+		}
 	} else
 		retval = uart_startup(info, 1);
  exit:

drivers/serial/sa1100.c

@@ -441,7 +441,7 @@ sa1100_set_termios(struct uart_port *port, struct termios *termios,
 {
 	struct sa1100_port *sport = (struct sa1100_port *)port;
 	unsigned long flags;
-	unsigned int utcr0, old_utcr3, quot;
+	unsigned int utcr0, old_utcr3, baud, quot;
 	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
 
 	/*
@@ -470,7 +470,8 @@ sa1100_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
@@ -507,7 +508,7 @@ sa1100_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	/*
 	 * disable interrupts and drain transmitter

drivers/serial/sunsu.c

@@ -853,7 +853,7 @@ sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, cflag, quot);
+	uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
 
 	up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 	if (iflag & INPCK)
@@ -920,12 +920,13 @@ static void
 sunsu_set_termios(struct uart_port *port, struct termios *termios,
 		  struct termios *old)
 {
-	unsigned int quot;
+	unsigned int baud, quot;
 
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
 }

drivers/serial/uart00.c

@@ -317,7 +317,7 @@ static void
 uart00_set_termios(struct uart_port *port, struct termios *termios,
 		   struct termios *old)
 {
-	unsigned int uart_mc, old_ies, quot;
+	unsigned int uart_mc, old_ies, baud, quot;
 	unsigned long flags;
 
 	/*
@@ -328,7 +328,8 @@ uart00_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	quot = uart_get_divisor(port, termios, old);
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
 
 	/* byte size and parity */
 	switch (termios->c_cflag & CSIZE) {
@@ -358,7 +359,7 @@ uart00_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, quot);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	port->read_status_mask = UART_RDS_OE_MSK;
 	if (termios->c_iflag & INPCK)

include/linux/serial.h

@@ -91,6 +91,7 @@ struct serial_uart_config {
 #define UART_CLEAR_FIFO		0x01
 #define UART_USE_FIFO		0x02
 #define UART_STARTECH		0x04
+#define UART_NATSEMI		0x08
 
 /*
  * Definitions for async_struct (and serial_struct) flags field

include/linux/serial_core.h

@@ -37,7 +37,8 @@
 #define PORT_16654	11
 #define PORT_16850	12
 #define PORT_RSA	13
-#define PORT_MAX_8250	13	/* max port ID */
+#define PORT_NS16550A	14
+#define PORT_MAX_8250	14	/* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed
@@ -172,6 +173,7 @@ struct uart_port {
 #define UPF_LOW_LATENCY		(1 << 13)
 #define UPF_BUGGY_UART		(1 << 14)
 #define UPF_AUTOPROBE		(1 << 15)
+#define UPF_MAGIC_MULTIPLIER	(1 << 16)
 #define UPF_BOOT_ONLYMCA	(1 << 22)
 #define UPF_CONS_FLOW		(1 << 23)
 #define UPF_SHARE_IRQ		(1 << 24)
@@ -179,7 +181,7 @@ struct uart_port {
 #define UPF_RESOURCES		(1 << 30)
 #define UPF_IOREMAP		(1 << 31)
 
-#define UPF_CHANGE_MASK		(0x7fff)
+#define UPF_CHANGE_MASK		(0x17fff)
 #define UPF_USR_MASK		(UPF_SPD_MASK|UPF_LOW_LATENCY)
 
 	unsigned int		mctrl;			/* current modem ctrl settings */
@@ -279,12 +281,11 @@ void uart_write_wakeup(struct uart_port *port);
  * Baud rate helpers.
  */
 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
-			 unsigned int quot);
+			 unsigned int baud);
 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
 				struct termios *old, unsigned int min,
 				unsigned int max);
-unsigned int uart_get_divisor(struct uart_port *port, struct termios *termios,
-			      struct termios *old_termios);
+unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 
 /*
  * Console helpers.