X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fserial%2F8250.c;h=b4b39811b44544cc76a4c71e00c5c02567a765c2;hb=51a2301e719e42b370bbb258c7ef6a7e7590b390;hp=f47d2c454e331be473b008398ac66a9f0778ab9f;hpb=d052d1beff706920e82c5d55006b08e256b5df09;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index f47d2c4..b4b3981 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -12,14 +12,11 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
- *  $Id: 8250.c,v 1.90 2002/07/28 10:03:27 rmk Exp $
- *
  * A note about mapbase / membase
  *
  *  mapbase is the physical address of the IO port.
  *  membase is an 'ioremapped' cookie.
  */
-#include <linux/config.h>
 
 #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
 #define SUPPORT_SYSRQ
@@ -31,7 +28,6 @@
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/sysrq.h>
-#include <linux/mca.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/tty.h>
@@ -40,19 +36,34 @@
 #include <linux/serial_core.h>
 #include <linux/serial.h>
 #include <linux/serial_8250.h>
+#include <linux/nmi.h>
+#include <linux/mutex.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
 
 #include "8250.h"
 
+#ifdef CONFIG_SPARC
+#include "suncore.h"
+#endif
+
 /*
  * Configuration:
- *   share_irqs - whether we pass SA_SHIRQ to request_irq().  This option
+ *   share_irqs - whether we pass IRQF_SHARED to request_irq().  This option
  *                is unsafe when used on edge-triggered interrupts.
  */
 static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
 
+static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
+
+static struct uart_driver serial8250_reg;
+
+static int serial_index(struct uart_port *port)
+{
+	return (serial8250_reg.minor - 64) + port->line;
+}
+
 /*
  * Debugging.
  */
@@ -91,7 +102,6 @@ static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
 #define CONFIG_HUB6 1
 
 #include <asm/serial.h>
-
 /*
  * SERIAL_PORT_DFNS tells us about built-in ports that have no
  * standard enumeration mechanism.   Platforms that can find all
@@ -101,7 +111,7 @@ static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
 #define SERIAL_PORT_DFNS
 #endif
 
-static struct old_serial_port old_serial_port[] = {
+static const struct old_serial_port old_serial_port[] = {
 	SERIAL_PORT_DFNS /* defined in asm/serial.h */
 };
 
@@ -127,7 +137,16 @@ struct uart_8250_port {
 	unsigned char		mcr;
 	unsigned char		mcr_mask;	/* mask of user bits */
 	unsigned char		mcr_force;	/* mask of forced bits */
-	unsigned char		lsr_break_flag;
+
+	/*
+	 * Some bits in registers are cleared on a read, so they must
+	 * be saved whenever the register is read but the bits will not
+	 * be immediately processed.
+	 */
+#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
+	unsigned char		lsr_saved_flags;
+#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
+	unsigned char		msr_saved_flags;
 
 	/*
 	 * We provide a per-port pm hook.
@@ -137,11 +156,15 @@ struct uart_8250_port {
 };
 
 struct irq_info {
-	spinlock_t		lock;
+	struct			hlist_node node;
+	int			irq;
+	spinlock_t		lock;	/* Protects list not the hash */
 	struct list_head	*head;
 };
 
-static struct irq_info irq_lists[NR_IRQS];
+#define NR_IRQ_HASH		32	/* Can be adjusted later */
+static struct hlist_head irq_lists[NR_IRQ_HASH];
+static DEFINE_MUTEX(hash_mutex);	/* Used to walk the hash */
 
 /*
  * Here we define the default xmit fifo size used for each type of UART.
@@ -249,52 +272,268 @@ static const struct serial8250_config uart_config[] = {
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
 		.flags		= UART_CAP_FIFO | UART_CAP_UUE,
 	},
+	[PORT_RM9000] = {
+		.name		= "RM9000",
+		.fifo_size	= 16,
+		.tx_loadsz	= 16,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.flags		= UART_CAP_FIFO,
+	},
+	[PORT_OCTEON] = {
+		.name		= "OCTEON",
+		.fifo_size	= 64,
+		.tx_loadsz	= 64,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.flags		= UART_CAP_FIFO,
+	},
+};
+
+#if defined (CONFIG_SERIAL_8250_AU1X00)
+
+/* Au1x00 UART hardware has a weird register layout */
+static const u8 au_io_in_map[] = {
+	[UART_RX]  = 0,
+	[UART_IER] = 2,
+	[UART_IIR] = 3,
+	[UART_LCR] = 5,
+	[UART_MCR] = 6,
+	[UART_LSR] = 7,
+	[UART_MSR] = 8,
+};
+
+static const u8 au_io_out_map[] = {
+	[UART_TX]  = 1,
+	[UART_IER] = 2,
+	[UART_FCR] = 4,
+	[UART_LCR] = 5,
+	[UART_MCR] = 6,
 };
 
-static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
+/* sane hardware needs no mapping */
+static inline int map_8250_in_reg(struct uart_port *p, int offset)
 {
-	offset <<= up->port.regshift;
+	if (p->iotype != UPIO_AU)
+		return offset;
+	return au_io_in_map[offset];
+}
 
-	switch (up->port.iotype) {
-	case UPIO_HUB6:
-		outb(up->port.hub6 - 1 + offset, up->port.iobase);
-		return inb(up->port.iobase + 1);
+static inline int map_8250_out_reg(struct uart_port *p, int offset)
+{
+	if (p->iotype != UPIO_AU)
+		return offset;
+	return au_io_out_map[offset];
+}
 
-	case UPIO_MEM:
-		return readb(up->port.membase + offset);
+#elif defined(CONFIG_SERIAL_8250_RM9K)
 
-	case UPIO_MEM32:
-		return readl(up->port.membase + offset);
+static const u8
+	regmap_in[8] = {
+		[UART_RX]	= 0x00,
+		[UART_IER]	= 0x0c,
+		[UART_IIR]	= 0x14,
+		[UART_LCR]	= 0x1c,
+		[UART_MCR]	= 0x20,
+		[UART_LSR]	= 0x24,
+		[UART_MSR]	= 0x28,
+		[UART_SCR]	= 0x2c
+	},
+	regmap_out[8] = {
+		[UART_TX] 	= 0x04,
+		[UART_IER]	= 0x0c,
+		[UART_FCR]	= 0x18,
+		[UART_LCR]	= 0x1c,
+		[UART_MCR]	= 0x20,
+		[UART_LSR]	= 0x24,
+		[UART_MSR]	= 0x28,
+		[UART_SCR]	= 0x2c
+	};
 
-	default:
-		return inb(up->port.iobase + offset);
+static inline int map_8250_in_reg(struct uart_port *p, int offset)
+{
+	if (p->iotype != UPIO_RM9000)
+		return offset;
+	return regmap_in[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_port *p, int offset)
+{
+	if (p->iotype != UPIO_RM9000)
+		return offset;
+	return regmap_out[offset];
+}
+
+#else
+
+/* sane hardware needs no mapping */
+#define map_8250_in_reg(up, offset) (offset)
+#define map_8250_out_reg(up, offset) (offset)
+
+#endif
+
+static unsigned int hub6_serial_in(struct uart_port *p, int offset)
+{
+	offset = map_8250_in_reg(p, offset) << p->regshift;
+	outb(p->hub6 - 1 + offset, p->iobase);
+	return inb(p->iobase + 1);
+}
+
+static void hub6_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	outb(p->hub6 - 1 + offset, p->iobase);
+	outb(value, p->iobase + 1);
+}
+
+static unsigned int mem_serial_in(struct uart_port *p, int offset)
+{
+	offset = map_8250_in_reg(p, offset) << p->regshift;
+	return readb(p->membase + offset);
+}
+
+static void mem_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	writeb(value, p->membase + offset);
+}
+
+static void mem32_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	writel(value, p->membase + offset);
+}
+
+static unsigned int mem32_serial_in(struct uart_port *p, int offset)
+{
+	offset = map_8250_in_reg(p, offset) << p->regshift;
+	return readl(p->membase + offset);
+}
+
+#ifdef CONFIG_SERIAL_8250_AU1X00
+static unsigned int au_serial_in(struct uart_port *p, int offset)
+{
+	offset = map_8250_in_reg(p, offset) << p->regshift;
+	return __raw_readl(p->membase + offset);
+}
+
+static void au_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	__raw_writel(value, p->membase + offset);
+}
+#endif
+
+static unsigned int tsi_serial_in(struct uart_port *p, int offset)
+{
+	unsigned int tmp;
+	offset = map_8250_in_reg(p, offset) << p->regshift;
+	if (offset == UART_IIR) {
+		tmp = readl(p->membase + (UART_IIR & ~3));
+		return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */
+	} else
+		return readb(p->membase + offset);
+}
+
+static void tsi_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	if (!((offset == UART_IER) && (value & UART_IER_UUE)))
+		writeb(value, p->membase + offset);
+}
+
+static void dwapb_serial_out(struct uart_port *p, int offset, int value)
+{
+	int save_offset = offset;
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	/* Save the LCR value so it can be re-written when a
+	 * Busy Detect interrupt occurs. */
+	if (save_offset == UART_LCR) {
+		struct uart_8250_port *up = (struct uart_8250_port *)p;
+		up->lcr = value;
 	}
+	writeb(value, p->membase + offset);
+	/* Read the IER to ensure any interrupt is cleared before
+	 * returning from ISR. */
+	if (save_offset == UART_TX || save_offset == UART_IER)
+		value = p->serial_in(p, UART_IER);
 }
 
-static _INLINE_ void
-serial_out(struct uart_8250_port *up, int offset, int value)
+static unsigned int io_serial_in(struct uart_port *p, int offset)
 {
-	offset <<= up->port.regshift;
+	offset = map_8250_in_reg(p, offset) << p->regshift;
+	return inb(p->iobase + offset);
+}
 
-	switch (up->port.iotype) {
+static void io_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = map_8250_out_reg(p, offset) << p->regshift;
+	outb(value, p->iobase + offset);
+}
+
+static void set_io_from_upio(struct uart_port *p)
+{
+	switch (p->iotype) {
 	case UPIO_HUB6:
-		outb(up->port.hub6 - 1 + offset, up->port.iobase);
-		outb(value, up->port.iobase + 1);
+		p->serial_in = hub6_serial_in;
+		p->serial_out = hub6_serial_out;
 		break;
 
 	case UPIO_MEM:
-		writeb(value, up->port.membase + offset);
+		p->serial_in = mem_serial_in;
+		p->serial_out = mem_serial_out;
 		break;
 
+	case UPIO_RM9000:
 	case UPIO_MEM32:
-		writel(value, up->port.membase + offset);
+		p->serial_in = mem32_serial_in;
+		p->serial_out = mem32_serial_out;
+		break;
+
+#ifdef CONFIG_SERIAL_8250_AU1X00
+	case UPIO_AU:
+		p->serial_in = au_serial_in;
+		p->serial_out = au_serial_out;
+		break;
+#endif
+	case UPIO_TSI:
+		p->serial_in = tsi_serial_in;
+		p->serial_out = tsi_serial_out;
 		break;
 
+	case UPIO_DWAPB:
+		p->serial_in = mem_serial_in;
+		p->serial_out = dwapb_serial_out;
+		break;
+
+	default:
+		p->serial_in = io_serial_in;
+		p->serial_out = io_serial_out;
+		break;
+	}
+}
+
+static void
+serial_out_sync(struct uart_8250_port *up, int offset, int value)
+{
+	struct uart_port *p = &up->port;
+	switch (p->iotype) {
+	case UPIO_MEM:
+	case UPIO_MEM32:
+#ifdef CONFIG_SERIAL_8250_AU1X00
+	case UPIO_AU:
+#endif
+	case UPIO_DWAPB:
+		p->serial_out(p, offset, value);
+		p->serial_in(p, UART_LCR);	/* safe, no side-effects */
+		break;
 	default:
-		outb(value, up->port.iobase + offset);
+		p->serial_out(p, offset, value);
 	}
 }
 
+#define serial_in(up, offset)		\
+	(up->port.serial_in(&(up)->port, (offset)))
+#define serial_out(up, offset, value)	\
+	(up->port.serial_out(&(up)->port, (offset), (value)))
 /*
  * We used to support using pause I/O for certain machines.  We
  * haven't supported this for a while, but just in case it's badly
@@ -304,6 +543,58 @@ serial_out(struct uart_8250_port *up, int offset, int value)
 #define serial_inp(up, offset)		serial_in(up, offset)
 #define serial_outp(up, offset, value)	serial_out(up, offset, value)
 
+/* Uart divisor latch read */
+static inline int _serial_dl_read(struct uart_8250_port *up)
+{
+	return serial_inp(up, UART_DLL) | serial_inp(up, UART_DLM) << 8;
+}
+
+/* Uart divisor latch write */
+static inline void _serial_dl_write(struct uart_8250_port *up, int value)
+{
+	serial_outp(up, UART_DLL, value & 0xff);
+	serial_outp(up, UART_DLM, value >> 8 & 0xff);
+}
+
+#if defined(CONFIG_SERIAL_8250_AU1X00)
+/* Au1x00 haven't got a standard divisor latch */
+static int serial_dl_read(struct uart_8250_port *up)
+{
+	if (up->port.iotype == UPIO_AU)
+		return __raw_readl(up->port.membase + 0x28);
+	else
+		return _serial_dl_read(up);
+}
+
+static void serial_dl_write(struct uart_8250_port *up, int value)
+{
+	if (up->port.iotype == UPIO_AU)
+		__raw_writel(value, up->port.membase + 0x28);
+	else
+		_serial_dl_write(up, value);
+}
+#elif defined(CONFIG_SERIAL_8250_RM9K)
+static int serial_dl_read(struct uart_8250_port *up)
+{
+	return	(up->port.iotype == UPIO_RM9000) ?
+		(((__raw_readl(up->port.membase + 0x10) << 8) |
+		(__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff) :
+		_serial_dl_read(up);
+}
+
+static void serial_dl_write(struct uart_8250_port *up, int value)
+{
+	if (up->port.iotype == UPIO_RM9000) {
+		__raw_writel(value, up->port.membase + 0x08);
+		__raw_writel(value >> 8, up->port.membase + 0x10);
+	} else {
+		_serial_dl_write(up, value);
+	}
+}
+#else
+#define serial_dl_read(up) _serial_dl_read(up)
+#define serial_dl_write(up, value) _serial_dl_write(up, value)
+#endif
 
 /*
  * For the 16C950
@@ -329,7 +620,7 @@ static unsigned int serial_icr_read(struct uart_8250_port *up, int offset)
 /*
  * FIFO support.
  */
-static inline void serial8250_clear_fifos(struct uart_8250_port *p)
+static void serial8250_clear_fifos(struct uart_8250_port *p)
 {
 	if (p->capabilities & UART_CAP_FIFO) {
 		serial_outp(p, UART_FCR, UART_FCR_ENABLE_FIFO);
@@ -344,7 +635,7 @@ static inline void serial8250_clear_fifos(struct uart_8250_port *p)
  * capability" bit enabled.  Note that on XR16C850s, we need to
  * reset LCR to write to IER.
  */
-static inline void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
+static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
 {
 	if (p->capabilities & UART_CAP_SLEEP) {
 		if (p->capabilities & UART_CAP_EFR) {
@@ -436,7 +727,8 @@ static void disable_rsa(struct uart_8250_port *up)
  */
 static int size_fifo(struct uart_8250_port *up)
 {
-	unsigned char old_fcr, old_mcr, old_dll, old_dlm, old_lcr;
+	unsigned char old_fcr, old_mcr, old_lcr;
+	unsigned short old_dl;
 	int count;
 
 	old_lcr = serial_inp(up, UART_LCR);
@@ -447,10 +739,8 @@ static int size_fifo(struct uart_8250_port *up)
 		    UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 	serial_outp(up, UART_MCR, UART_MCR_LOOP);
 	serial_outp(up, UART_LCR, UART_LCR_DLAB);
-	old_dll = serial_inp(up, UART_DLL);
-	old_dlm = serial_inp(up, UART_DLM);
-	serial_outp(up, UART_DLL, 0x01);
-	serial_outp(up, UART_DLM, 0x00);
+	old_dl = serial_dl_read(up);
+	serial_dl_write(up, 0x0001);
 	serial_outp(up, UART_LCR, 0x03);
 	for (count = 0; count < 256; count++)
 		serial_outp(up, UART_TX, count);
@@ -461,8 +751,7 @@ static int size_fifo(struct uart_8250_port *up)
 	serial_outp(up, UART_FCR, old_fcr);
 	serial_outp(up, UART_MCR, old_mcr);
 	serial_outp(up, UART_LCR, UART_LCR_DLAB);
-	serial_outp(up, UART_DLL, old_dll);
-	serial_outp(up, UART_DLM, old_dlm);
+	serial_dl_write(up, old_dl);
 	serial_outp(up, UART_LCR, old_lcr);
 
 	return count;
@@ -503,7 +792,7 @@ static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
  * its clones.  (We treat the broken original StarTech 16650 V1 as a
  * 16550, and why not?  Startech doesn't seem to even acknowledge its
  * existence.)
- * 
+ *
  * What evil have men's minds wrought...
  */
 static void autoconfig_has_efr(struct uart_8250_port *up)
@@ -556,7 +845,7 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
 			up->bugs |= UART_BUG_QUOT;
 		return;
 	}
-	
+
 	/*
 	 * We check for a XR16C850 by setting DLL and DLM to 0, and then
 	 * reading back DLL and DLM.  The chip type depends on the DLM
@@ -692,17 +981,15 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 
 			serial_outp(up, UART_LCR, 0xE0);
 
-			quot = serial_inp(up, UART_DLM) << 8;
-			quot += serial_inp(up, UART_DLL);
+			quot = serial_dl_read(up);
 			quot <<= 3;
 
-			status1 = serial_in(up, 0x04); /* EXCR1 */
+			status1 = serial_in(up, 0x04); /* EXCR2 */
 			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_DLL, quot & 0xff);
-			serial_outp(up, UART_DLM, quot >> 8);
+
+			serial_dl_write(up, quot);
 
 			serial_outp(up, UART_LCR, 0);
 
@@ -790,14 +1077,13 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 		return;
 
 	DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04x, 0x%p): ",
-			up->port.line, up->port.iobase, up->port.membase);
+		       serial_index(&up->port), up->port.iobase, up->port.membase);
 
 	/*
 	 * We really do need global IRQs disabled here - we're going to
 	 * be frobbing the chips IRQ enable register to see if it exists.
 	 */
 	spin_lock_irqsave(&up->port.lock, flags);
-//	save_flags(flags); cli();
 
 	up->capabilities = 0;
 	up->bugs = 0;
@@ -806,7 +1092,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 		/*
 		 * Do a simple existence test first; if we fail this,
 		 * there's no point trying anything else.
-		 * 
+		 *
 		 * 0x80 is used as a nonsense port to prevent against
 		 * false positives due to ISA bus float.  The
 		 * assumption is that 0x80 is a non-existent port;
@@ -821,12 +1107,16 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 #ifdef __i386__
 		outb(0xff, 0x080);
 #endif
-		scratch2 = serial_inp(up, UART_IER);
+		/*
+		 * Mask out IER[7:4] bits for test as some UARTs (e.g. TL
+		 * 16C754B) allow only to modify them if an EFR bit is set.
+		 */
+		scratch2 = serial_inp(up, UART_IER) & 0x0f;
 		serial_outp(up, UART_IER, 0x0F);
 #ifdef __i386__
 		outb(0, 0x080);
 #endif
-		scratch3 = serial_inp(up, UART_IER);
+		scratch3 = serial_inp(up, UART_IER) & 0x0f;
 		serial_outp(up, UART_IER, scratch);
 		if (scratch2 != 0 || scratch3 != 0x0F) {
 			/*
@@ -841,7 +1131,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 	save_mcr = serial_in(up, UART_MCR);
 	save_lcr = serial_in(up, UART_LCR);
 
-	/* 
+	/*
 	 * Check to see if a UART is really there.  Certain broken
 	 * internal modems based on the Rockwell chipset fail this
 	 * test, because they apparently don't implement the loopback
@@ -910,13 +1200,20 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 		}
 	}
 #endif
+
+#ifdef CONFIG_SERIAL_8250_AU1X00
+	/* if access method is AU, it is a 16550 with a quirk */
+	if (up->port.type == PORT_16550A && up->port.iotype == UPIO_AU)
+		up->bugs |= UART_BUG_NOMSR;
+#endif
+
 	serial_outp(up, UART_LCR, save_lcr);
 
 	if (up->capabilities != uart_config[up->port.type].flags) {
 		printk(KERN_WARNING
 		       "ttyS%d: detected caps %08x should be %08x\n",
-			up->port.line, up->capabilities,
-			uart_config[up->port.type].flags);
+		       serial_index(&up->port), up->capabilities,
+		       uart_config[up->port.type].flags);
 	}
 
 	up->port.fifosize = uart_config[up->port.type].fifo_size;
@@ -935,12 +1232,14 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 #endif
 	serial_outp(up, UART_MCR, save_mcr);
 	serial8250_clear_fifos(up);
-	(void)serial_in(up, UART_RX);
-	serial_outp(up, UART_IER, 0);
+	serial_in(up, UART_RX);
+	if (up->capabilities & UART_CAP_UUE)
+		serial_outp(up, UART_IER, UART_IER_UUE);
+	else
+		serial_outp(up, UART_IER, 0);
 
- out:	
+ out:
 	spin_unlock_irqrestore(&up->port.lock, flags);
-//	restore_flags(flags);
 	DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
 }
 
@@ -964,11 +1263,11 @@ static void autoconfig_irq(struct uart_8250_port *up)
 	save_mcr = serial_inp(up, UART_MCR);
 	save_ier = serial_inp(up, UART_IER);
 	serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
-	
+
 	irqs = probe_irq_on();
 	serial_outp(up, UART_MCR, 0);
-	udelay (10);
-	if (up->port.flags & UPF_FOURPORT)  {
+	udelay(10);
+	if (up->port.flags & UPF_FOURPORT) {
 		serial_outp(up, UART_MCR,
 			    UART_MCR_DTR | UART_MCR_RTS);
 	} else {
@@ -981,7 +1280,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
 	(void)serial_inp(up, UART_IIR);
 	(void)serial_inp(up, UART_MSR);
 	serial_outp(up, UART_TX, 0xFF);
-	udelay (20);
+	udelay(20);
 	irq = probe_irq_off(irqs);
 
 	serial_outp(up, UART_MCR, save_mcr);
@@ -1029,8 +1328,12 @@ static void serial8250_start_tx(struct uart_port *port)
 		if (up->bugs & UART_BUG_TXEN) {
 			unsigned char lsr, iir;
 			lsr = serial_in(up, UART_LSR);
-			iir = serial_in(up, UART_IIR);
-			if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)
+			up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+			iir = serial_in(up, UART_IIR) & 0x0f;
+			if ((up->port.type == PORT_RM9000) ?
+				(lsr & UART_LSR_THRE &&
+				(iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) :
+				(lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT))
 				transmit_chars(up);
 		}
 	}
@@ -1057,48 +1360,42 @@ static void serial8250_enable_ms(struct uart_port *port)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 
+	/* no MSR capabilities */
+	if (up->bugs & UART_BUG_NOMSR)
+		return;
+
 	up->ier |= UART_IER_MSI;
 	serial_out(up, UART_IER, up->ier);
 }
 
-static _INLINE_ void
-receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
+static void
+receive_chars(struct uart_8250_port *up, unsigned int *status)
 {
-	struct tty_struct *tty = up->port.info->tty;
+	struct tty_struct *tty = up->port.info->port.tty;
 	unsigned char ch, lsr = *status;
 	int max_count = 256;
 	char flag;
 
 	do {
-		/* The following is not allowed by the tty layer and
-		   unsafe. It should be fixed ASAP */
-		if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
-			if (tty->low_latency) {
-				spin_unlock(&up->port.lock);
-				tty_flip_buffer_push(tty);
-				spin_lock(&up->port.lock);
-			}
+		if (likely(lsr & UART_LSR_DR))
+			ch = serial_inp(up, UART_RX);
+		else
 			/*
-			 * If this failed then we will throw away the
-			 * bytes but must do so to clear interrupts
+			 * Intel 82571 has a Serial Over Lan device that will
+			 * set UART_LSR_BI without setting UART_LSR_DR when
+			 * it receives a break. To avoid reading from the
+			 * receive buffer without UART_LSR_DR bit set, we
+			 * just force the read character to be 0
 			 */
-		}
-		ch = serial_inp(up, UART_RX);
+			ch = 0;
+
 		flag = TTY_NORMAL;
 		up->port.icount.rx++;
 
-#ifdef CONFIG_SERIAL_8250_CONSOLE
-		/*
-		 * Recover the break flag from console xmit
-		 */
-		if (up->port.line == up->port.cons->index) {
-			lsr |= up->lsr_break_flag;
-			up->lsr_break_flag = 0;
-		}
-#endif
+		lsr |= up->lsr_saved_flags;
+		up->lsr_saved_flags = 0;
 
-		if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
-				    UART_LSR_FE | UART_LSR_OE))) {
+		if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
 			/*
 			 * For statistics only
 			 */
@@ -1133,21 +1430,21 @@ receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
 			else if (lsr & UART_LSR_FE)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 
 		uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
 
-	ignore_char:
+ignore_char:
 		lsr = serial_inp(up, UART_LSR);
-	} while ((lsr & UART_LSR_DR) && (max_count-- > 0));
+	} while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
 	spin_unlock(&up->port.lock);
 	tty_flip_buffer_push(tty);
 	spin_lock(&up->port.lock);
 	*status = lsr;
 }
 
-static _INLINE_ void transmit_chars(struct uart_8250_port *up)
+static void transmit_chars(struct uart_8250_port *up)
 {
 	struct circ_buf *xmit = &up->port.info->xmit;
 	int count;
@@ -1185,42 +1482,50 @@ static _INLINE_ void transmit_chars(struct uart_8250_port *up)
 		__stop_tx(up);
 }
 
-static _INLINE_ void check_modem_status(struct uart_8250_port *up)
+static unsigned int check_modem_status(struct uart_8250_port *up)
 {
-	int status;
+	unsigned int status = serial_in(up, UART_MSR);
 
-	status = serial_in(up, UART_MSR);
+	status |= up->msr_saved_flags;
+	up->msr_saved_flags = 0;
+	if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
+	    up->port.info != NULL) {
+		if (status & UART_MSR_TERI)
+			up->port.icount.rng++;
+		if (status & UART_MSR_DDSR)
+			up->port.icount.dsr++;
+		if (status & UART_MSR_DDCD)
+			uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+		if (status & UART_MSR_DCTS)
+			uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 
-	if ((status & UART_MSR_ANY_DELTA) == 0)
-		return;
-
-	if (status & UART_MSR_TERI)
-		up->port.icount.rng++;
-	if (status & UART_MSR_DDSR)
-		up->port.icount.dsr++;
-	if (status & UART_MSR_DDCD)
-		uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
-	if (status & UART_MSR_DCTS)
-		uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+		wake_up_interruptible(&up->port.info->delta_msr_wait);
+	}
 
-	wake_up_interruptible(&up->port.info->delta_msr_wait);
+	return status;
 }
 
 /*
  * This handles the interrupt from one port.
  */
-static inline void
-serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
+static void serial8250_handle_port(struct uart_8250_port *up)
 {
-	unsigned int status = serial_inp(up, UART_LSR);
+	unsigned int status;
+	unsigned long flags;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	status = serial_inp(up, UART_LSR);
 
 	DEBUG_INTR("status = %x...", status);
 
-	if (status & UART_LSR_DR)
-		receive_chars(up, &status, regs);
+	if (status & (UART_LSR_DR | UART_LSR_BI))
+		receive_chars(up, &status);
 	check_modem_status(up);
 	if (status & UART_LSR_THRE)
 		transmit_chars(up);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
 /*
@@ -1237,7 +1542,7 @@ serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
  * This means we need to loop through all ports. checking that they
  * don't have an interrupt pending.
  */
-static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
 {
 	struct irq_info *i = dev_id;
 	struct list_head *l, *end = NULL;
@@ -1256,9 +1561,20 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *r
 
 		iir = serial_in(up, UART_IIR);
 		if (!(iir & UART_IIR_NO_INT)) {
-			spin_lock(&up->port.lock);
-			serial8250_handle_port(up, regs);
-			spin_unlock(&up->port.lock);
+			serial8250_handle_port(up);
+
+			handled = 1;
+
+			end = NULL;
+		} else if (up->port.iotype == UPIO_DWAPB &&
+			  (iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+			/* The DesignWare APB UART has an Busy Detect (0x07)
+			 * interrupt meaning an LCR write attempt occured while the
+			 * UART was busy. The interrupt must be cleared by reading
+			 * the UART status register (USR) and the LCR re-written. */
+			unsigned int status;
+			status = *(volatile u32 *)up->port.private_data;
+			serial_out(up, UART_LCR, up->lcr);
 
 			handled = 1;
 
@@ -1302,14 +1618,42 @@ static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
 		BUG_ON(i->head != &up->list);
 		i->head = NULL;
 	}
-
 	spin_unlock_irq(&i->lock);
+	/* List empty so throw away the hash node */
+	if (i->head == NULL) {
+		hlist_del(&i->node);
+		kfree(i);
+	}
 }
 
 static int serial_link_irq_chain(struct uart_8250_port *up)
 {
-	struct irq_info *i = irq_lists + up->port.irq;
-	int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? SA_SHIRQ : 0;
+	struct hlist_head *h;
+	struct hlist_node *n;
+	struct irq_info *i;
+	int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
+
+	mutex_lock(&hash_mutex);
+
+	h = &irq_lists[up->port.irq % NR_IRQ_HASH];
+
+	hlist_for_each(n, h) {
+		i = hlist_entry(n, struct irq_info, node);
+		if (i->irq == up->port.irq)
+			break;
+	}
+
+	if (n == NULL) {
+		i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
+		if (i == NULL) {
+			mutex_unlock(&hash_mutex);
+			return -ENOMEM;
+		}
+		spin_lock_init(&i->lock);
+		i->irq = up->port.irq;
+		hlist_add_head(&i->node, h);
+	}
+	mutex_unlock(&hash_mutex);
 
 	spin_lock_irq(&i->lock);
 
@@ -1334,14 +1678,34 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
 
 static void serial_unlink_irq_chain(struct uart_8250_port *up)
 {
-	struct irq_info *i = irq_lists + up->port.irq;
+	struct irq_info *i;
+	struct hlist_node *n;
+	struct hlist_head *h;
+
+	mutex_lock(&hash_mutex);
 
+	h = &irq_lists[up->port.irq % NR_IRQ_HASH];
+
+	hlist_for_each(n, h) {
+		i = hlist_entry(n, struct irq_info, node);
+		if (i->irq == up->port.irq)
+			break;
+	}
+
+	BUG_ON(n == NULL);
 	BUG_ON(i->head == NULL);
 
 	if (list_empty(i->head))
 		free_irq(up->port.irq, i);
 
 	serial_do_unlink(i, up);
+	mutex_unlock(&hash_mutex);
+}
+
+/* Base timer interval for polling */
+static inline int poll_timeout(int timeout)
+{
+	return timeout > 6 ? (timeout / 2 - 2) : 1;
 }
 
 /*
@@ -1353,41 +1717,80 @@ static void serial_unlink_irq_chain(struct uart_8250_port *up)
 static void serial8250_timeout(unsigned long data)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)data;
-	unsigned int timeout;
 	unsigned int iir;
 
 	iir = serial_in(up, UART_IIR);
-	if (!(iir & UART_IIR_NO_INT)) {
-		spin_lock(&up->port.lock);
-		serial8250_handle_port(up, NULL);
-		spin_unlock(&up->port.lock);
+	if (!(iir & UART_IIR_NO_INT))
+		serial8250_handle_port(up);
+	mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout));
+}
+
+static void serial8250_backup_timeout(unsigned long data)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)data;
+	unsigned int iir, ier = 0, lsr;
+	unsigned long flags;
+
+	/*
+	 * Must disable interrupts or else we risk racing with the interrupt
+	 * based handler.
+	 */
+	if (is_real_interrupt(up->port.irq)) {
+		ier = serial_in(up, UART_IER);
+		serial_out(up, UART_IER, 0);
+	}
+
+	iir = serial_in(up, UART_IIR);
+
+	/*
+	 * This should be a safe test for anyone who doesn't trust the
+	 * IIR bits on their UART, but it's specifically designed for
+	 * the "Diva" UART used on the management processor on many HP
+	 * ia64 and parisc boxes.
+	 */
+	spin_lock_irqsave(&up->port.lock, flags);
+	lsr = serial_in(up, UART_LSR);
+	up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+	spin_unlock_irqrestore(&up->port.lock, flags);
+	if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
+	    (!uart_circ_empty(&up->port.info->xmit) || up->port.x_char) &&
+	    (lsr & UART_LSR_THRE)) {
+		iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
+		iir |= UART_IIR_THRI;
 	}
 
-	timeout = up->port.timeout;
-	timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
-	mod_timer(&up->timer, jiffies + timeout);
+	if (!(iir & UART_IIR_NO_INT))
+		serial8250_handle_port(up);
+
+	if (is_real_interrupt(up->port.irq))
+		serial_out(up, UART_IER, ier);
+
+	/* Standard timer interval plus 0.2s to keep the port running */
+	mod_timer(&up->timer,
+		jiffies + poll_timeout(up->port.timeout) + HZ / 5);
 }
 
 static unsigned int serial8250_tx_empty(struct uart_port *port)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 	unsigned long flags;
-	unsigned int ret;
+	unsigned int lsr;
 
 	spin_lock_irqsave(&up->port.lock, flags);
-	ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+	lsr = serial_in(up, UART_LSR);
+	up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
 	spin_unlock_irqrestore(&up->port.lock, flags);
 
-	return ret;
+	return lsr & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
 }
 
 static unsigned int serial8250_get_mctrl(struct uart_port *port)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
-	unsigned char status;
+	unsigned int status;
 	unsigned int ret;
 
-	status = serial_in(up, UART_MSR);
+	status = check_modem_status(up);
 
 	ret = 0;
 	if (status & UART_MSR_DCD)
@@ -1436,6 +1839,94 @@ static void serial8250_break_ctl(struct uart_port *port, int break_state)
 	spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ *	Wait for transmitter & holding register to empty
+ */
+static void wait_for_xmitr(struct uart_8250_port *up, int bits)
+{
+	unsigned int status, tmout = 10000;
+
+	/* Wait up to 10ms for the character(s) to be sent. */
+	do {
+		status = serial_in(up, UART_LSR);
+
+		up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;
+
+		if (--tmout == 0)
+			break;
+		udelay(1);
+	} while ((status & bits) != bits);
+
+	/* Wait up to 1s for flow control if necessary */
+	if (up->port.flags & UPF_CONS_FLOW) {
+		unsigned int tmout;
+		for (tmout = 1000000; tmout; tmout--) {
+			unsigned int msr = serial_in(up, UART_MSR);
+			up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
+			if (msr & UART_MSR_CTS)
+				break;
+			udelay(1);
+			touch_nmi_watchdog();
+		}
+	}
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static int serial8250_get_poll_char(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned char lsr = serial_inp(up, UART_LSR);
+
+	while (!(lsr & UART_LSR_DR))
+		lsr = serial_inp(up, UART_LSR);
+
+	return serial_inp(up, UART_RX);
+}
+
+
+static void serial8250_put_poll_char(struct uart_port *port,
+			 unsigned char c)
+{
+	unsigned int ier;
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+	/*
+	 *	First save the IER then disable the interrupts
+	 */
+	ier = serial_in(up, UART_IER);
+	if (up->capabilities & UART_CAP_UUE)
+		serial_out(up, UART_IER, UART_IER_UUE);
+	else
+		serial_out(up, UART_IER, 0);
+
+	wait_for_xmitr(up, BOTH_EMPTY);
+	/*
+	 *	Send the character out.
+	 *	If a LF, also do CR...
+	 */
+	serial_out(up, UART_TX, c);
+	if (c == 10) {
+		wait_for_xmitr(up, BOTH_EMPTY);
+		serial_out(up, UART_TX, 13);
+	}
+
+	/*
+	 *	Finally, wait for transmitter to become empty
+	 *	and restore the IER
+	 */
+	wait_for_xmitr(up, BOTH_EMPTY);
+	serial_out(up, UART_IER, ier);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
 static int serial8250_startup(struct uart_port *port)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
@@ -1469,7 +1960,7 @@ static int serial8250_startup(struct uart_port *port)
 
 	/*
 	 * Clear the FIFO buffers and disable them.
-	 * (they will be reeanbled in set_termios())
+	 * (they will be reenabled in set_termios())
 	 */
 	serial8250_clear_fifos(up);
 
@@ -1488,7 +1979,8 @@ static int serial8250_startup(struct uart_port *port)
 	 */
 	if (!(up->port.flags & UPF_BUGGY_UART) &&
 	    (serial_inp(up, UART_LSR) == 0xff)) {
-		printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
+		printk(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
+		       serial_index(&up->port));
 		return -ENODEV;
 	}
 
@@ -1509,18 +2001,64 @@ static int serial8250_startup(struct uart_port *port)
 		serial_outp(up, UART_LCR, 0);
 	}
 
+	if (is_real_interrupt(up->port.irq)) {
+		unsigned char iir1;
+		/*
+		 * Test for UARTs that do not reassert THRE when the
+		 * transmitter is idle and the interrupt has already
+		 * been cleared.  Real 16550s should always reassert
+		 * this interrupt whenever the transmitter is idle and
+		 * the interrupt is enabled.  Delays are necessary to
+		 * allow register changes to become visible.
+		 */
+		spin_lock_irqsave(&up->port.lock, flags);
+		if (up->port.flags & UPF_SHARE_IRQ)
+			disable_irq_nosync(up->port.irq);
+
+		wait_for_xmitr(up, UART_LSR_THRE);
+		serial_out_sync(up, UART_IER, UART_IER_THRI);
+		udelay(1); /* allow THRE to set */
+		iir1 = serial_in(up, UART_IIR);
+		serial_out(up, UART_IER, 0);
+		serial_out_sync(up, UART_IER, UART_IER_THRI);
+		udelay(1); /* allow a working UART time to re-assert THRE */
+		iir = serial_in(up, UART_IIR);
+		serial_out(up, UART_IER, 0);
+
+		if (up->port.flags & UPF_SHARE_IRQ)
+			enable_irq(up->port.irq);
+		spin_unlock_irqrestore(&up->port.lock, flags);
+
+		/*
+		 * If the interrupt is not reasserted, setup a timer to
+		 * kick the UART on a regular basis.
+		 */
+		if (!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) {
+			up->bugs |= UART_BUG_THRE;
+			pr_debug("ttyS%d - using backup timer\n",
+				 serial_index(port));
+		}
+	}
+
+	/*
+	 * The above check will only give an accurate result the first time
+	 * the port is opened so this value needs to be preserved.
+	 */
+	if (up->bugs & UART_BUG_THRE) {
+		up->timer.function = serial8250_backup_timeout;
+		up->timer.data = (unsigned long)up;
+		mod_timer(&up->timer, jiffies +
+			  poll_timeout(up->port.timeout) + HZ / 5);
+	}
+
 	/*
 	 * If the "interrupt" for this port doesn't correspond with any
 	 * hardware interrupt, we use a timer-based system.  The original
 	 * driver used to do this with IRQ0.
 	 */
 	if (!is_real_interrupt(up->port.irq)) {
-		unsigned int timeout = up->port.timeout;
-
-		timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
-
 		up->timer.data = (unsigned long)up;
-		mod_timer(&up->timer, jiffies + timeout);
+		mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout));
 	} else {
 		retval = serial_link_irq_chain(up);
 		if (retval)
@@ -1545,6 +2083,20 @@ static int serial8250_startup(struct uart_port *port)
 
 	serial8250_set_mctrl(&up->port, up->port.mctrl);
 
+	/* Serial over Lan (SoL) hack:
+	   Intel 8257x Gigabit ethernet chips have a
+	   16550 emulation, to be used for Serial Over Lan.
+	   Those chips take a longer time than a normal
+	   serial device to signalize that a transmission
+	   data was queued. Due to that, the above test generally
+	   fails. One solution would be to delay the reading of
+	   iir. However, this is not reliable, since the timeout
+	   is variable. So, let's just don't test if we receive
+	   TX irq. This way, we'll never enable UART_BUG_TXEN.
+	 */
+	if (up->port.flags & UPF_NO_TXEN_TEST)
+		goto dont_test_tx_en;
+
 	/*
 	 * Do a quick test to see if we receive an
 	 * interrupt when we enable the TX irq.
@@ -1558,15 +2110,28 @@ static int serial8250_startup(struct uart_port *port)
 		if (!(up->bugs & UART_BUG_TXEN)) {
 			up->bugs |= UART_BUG_TXEN;
 			pr_debug("ttyS%d - enabling bad tx status workarounds\n",
-				 port->line);
+				 serial_index(port));
 		}
 	} else {
 		up->bugs &= ~UART_BUG_TXEN;
 	}
 
+dont_test_tx_en:
 	spin_unlock_irqrestore(&up->port.lock, flags);
 
 	/*
+	 * Clear the interrupt registers again for luck, and clear the
+	 * saved flags to avoid getting false values from polling
+	 * routines or the previous session.
+	 */
+	serial_inp(up, UART_LSR);
+	serial_inp(up, UART_RX);
+	serial_inp(up, UART_IIR);
+	serial_inp(up, UART_MSR);
+	up->lsr_saved_flags = 0;
+	up->msr_saved_flags = 0;
+
+	/*
 	 * Finally, enable interrupts.  Note: Modem status interrupts
 	 * are set via set_termios(), which will be occurring imminently
 	 * anyway, so we don't enable them here.
@@ -1584,14 +2149,6 @@ static int serial8250_startup(struct uart_port *port)
 		(void) inb_p(icp);
 	}
 
-	/*
-	 * And clear the interrupt registers again for luck.
-	 */
-	(void) serial_inp(up, UART_LSR);
-	(void) serial_inp(up, UART_RX);
-	(void) serial_inp(up, UART_IIR);
-	(void) serial_inp(up, UART_MSR);
-
 	return 0;
 }
 
@@ -1636,9 +2193,9 @@ static void serial8250_shutdown(struct uart_port *port)
 	 */
 	(void) serial_in(up, UART_RX);
 
-	if (!is_real_interrupt(up->port.irq))
-		del_timer_sync(&up->timer);
-	else
+	del_timer_sync(&up->timer);
+	up->timer.function = serial8250_timeout;
+	if (is_real_interrupt(up->port.irq))
 		serial_unlink_irq_chain(up);
 }
 
@@ -1663,8 +2220,8 @@ static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int
 }
 
 static void
-serial8250_set_termios(struct uart_port *port, struct termios *termios,
-		       struct termios *old)
+serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
+		       struct ktermios *old)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 	unsigned char cval, fcr = 0;
@@ -1701,14 +2258,14 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 	quot = serial8250_get_divisor(port, baud);
 
 	/*
 	 * Oxford Semi 952 rev B workaround
 	 */
 	if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
-		quot ++;
+		quot++;
 
 	if (up->capabilities & UART_CAP_FIFO && up->port.fifosize > 1) {
 		if (baud < 2400)
@@ -1774,7 +2331,8 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	 * CTS flow control flag and modem status interrupts
 	 */
 	up->ier &= ~UART_IER_MSI;
-	if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+	if (!(up->bugs & UART_BUG_NOMSR) &&
+			UART_ENABLE_MS(&up->port, termios->c_cflag))
 		up->ier |= UART_IER_MSI;
 	if (up->capabilities & UART_CAP_UUE)
 		up->ier |= UART_IER_UUE | UART_IER_RTOIE;
@@ -1795,6 +2353,17 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 		serial_outp(up, UART_EFR, efr);
 	}
 
+#ifdef CONFIG_ARCH_OMAP
+	/* Workaround to enable 115200 baud on OMAP1510 internal ports */
+	if (cpu_is_omap1510() && is_omap_port(up)) {
+		if (baud == 115200) {
+			quot = 1;
+			serial_out(up, UART_OMAP_OSC_12M_SEL, 1);
+		} else
+			serial_out(up, UART_OMAP_OSC_12M_SEL, 0);
+	}
+#endif
+
 	if (up->capabilities & UART_NATSEMI) {
 		/* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */
 		serial_outp(up, UART_LCR, 0xe0);
@@ -1802,8 +2371,7 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 		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 */
+	serial_dl_write(up, quot);
 
 	/*
 	 * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
@@ -1823,6 +2391,9 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	}
 	serial8250_set_mctrl(&up->port, up->port.mctrl);
 	spin_unlock_irqrestore(&up->port.lock, flags);
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
 }
 
 static void
@@ -1837,16 +2408,31 @@ serial8250_pm(struct uart_port *port, unsigned int state,
 		p->pm(port, state, oldstate);
 }
 
+static unsigned int serial8250_port_size(struct uart_8250_port *pt)
+{
+	if (pt->port.iotype == UPIO_AU)
+		return 0x100000;
+#ifdef CONFIG_ARCH_OMAP
+	if (is_omap_port(pt))
+		return 0x16 << pt->port.regshift;
+#endif
+	return 8 << pt->port.regshift;
+}
+
 /*
  * Resource handling.
  */
 static int serial8250_request_std_resource(struct uart_8250_port *up)
 {
-	unsigned int size = 8 << up->port.regshift;
+	unsigned int size = serial8250_port_size(up);
 	int ret = 0;
 
 	switch (up->port.iotype) {
+	case UPIO_AU:
+	case UPIO_TSI:
+	case UPIO_MEM32:
 	case UPIO_MEM:
+	case UPIO_DWAPB:
 		if (!up->port.mapbase)
 			break;
 
@@ -1856,7 +2442,8 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
 		}
 
 		if (up->port.flags & UPF_IOREMAP) {
-			up->port.membase = ioremap(up->port.mapbase, size);
+			up->port.membase = ioremap_nocache(up->port.mapbase,
+									size);
 			if (!up->port.membase) {
 				release_mem_region(up->port.mapbase, size);
 				ret = -ENOMEM;
@@ -1875,10 +2462,14 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
 
 static void serial8250_release_std_resource(struct uart_8250_port *up)
 {
-	unsigned int size = 8 << up->port.regshift;
+	unsigned int size = serial8250_port_size(up);
 
 	switch (up->port.iotype) {
+	case UPIO_AU:
+	case UPIO_TSI:
+	case UPIO_MEM32:
 	case UPIO_MEM:
+	case UPIO_DWAPB:
 		if (!up->port.mapbase)
 			break;
 
@@ -1901,17 +2492,15 @@ static int serial8250_request_rsa_resource(struct uart_8250_port *up)
 {
 	unsigned long start = UART_RSA_BASE << up->port.regshift;
 	unsigned int size = 8 << up->port.regshift;
-	int ret = 0;
+	int ret = -EINVAL;
 
 	switch (up->port.iotype) {
-	case UPIO_MEM:
-		ret = -EINVAL;
-		break;
-
 	case UPIO_HUB6:
 	case UPIO_PORT:
 		start += up->port.iobase;
-		if (!request_region(start, size, "serial-rsa"))
+		if (request_region(start, size, "serial-rsa"))
+			ret = 0;
+		else
 			ret = -EBUSY;
 		break;
 	}
@@ -1925,9 +2514,6 @@ static void serial8250_release_rsa_resource(struct uart_8250_port *up)
 	unsigned int size = 8 << up->port.regshift;
 
 	switch (up->port.iotype) {
-	case UPIO_MEM:
-		break;
-
 	case UPIO_HUB6:
 	case UPIO_PORT:
 		release_region(up->port.iobase + offset, size);
@@ -1966,12 +2552,6 @@ static void serial8250_config_port(struct uart_port *port, int flags)
 	int ret;
 
 	/*
-	 * Don't probe for MCA ports on non-MCA machines.
-	 */
-	if (up->port.flags & UPF_BOOT_ONLYMCA && !MCA_bus)
-		return;
-
-	/*
 	 * Find the region that we can probe for.  This in turn
 	 * tells us whether we can probe for the type of port.
 	 */
@@ -1997,7 +2577,7 @@ static void serial8250_config_port(struct uart_port *port, int flags)
 static int
 serial8250_verify_port(struct uart_port *port, struct serial_struct *ser)
 {
-	if (ser->irq >= NR_IRQS || ser->irq < 0 ||
+	if (ser->irq >= nr_irqs || ser->irq < 0 ||
 	    ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
 	    ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS ||
 	    ser->type == PORT_STARTECH)
@@ -2033,6 +2613,10 @@ static struct uart_ops serial8250_pops = {
 	.request_port	= serial8250_request_port,
 	.config_port	= serial8250_config_port,
 	.verify_port	= serial8250_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = serial8250_get_poll_char,
+	.poll_put_char = serial8250_put_poll_char,
+#endif
 };
 
 static struct uart_8250_port serial8250_ports[UART_NR];
@@ -2047,7 +2631,7 @@ static void __init serial8250_isa_init_ports(void)
 		return;
 	first = 0;
 
-	for (i = 0; i < UART_NR; i++) {
+	for (i = 0; i < nr_uarts; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
 		up->port.line = i;
@@ -2066,7 +2650,7 @@ static void __init serial8250_isa_init_ports(void)
 	}
 
 	for (i = 0, up = serial8250_ports;
-	     i < ARRAY_SIZE(old_serial_port) && i < UART_NR;
+	     i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
 	     i++, up++) {
 		up->port.iobase   = old_serial_port[i].port;
 		up->port.irq      = irq_canonicalize(old_serial_port[i].irq);
@@ -2076,6 +2660,7 @@ static void __init serial8250_isa_init_ports(void)
 		up->port.membase  = old_serial_port[i].iomem_base;
 		up->port.iotype   = old_serial_port[i].io_type;
 		up->port.regshift = old_serial_port[i].iomem_reg_shift;
+		set_io_from_upio(&up->port);
 		if (share_irqs)
 			up->port.flags |= UPF_SHARE_IRQ;
 	}
@@ -2088,7 +2673,7 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev)
 
 	serial8250_isa_init_ports();
 
-	for (i = 0; i < UART_NR; i++) {
+	for (i = 0; i < nr_uarts; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
 		up->port.dev = dev;
@@ -2098,34 +2683,12 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev)
 
 #ifdef CONFIG_SERIAL_8250_CONSOLE
 
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
-/*
- *	Wait for transmitter & holding register to empty
- */
-static inline void wait_for_xmitr(struct uart_8250_port *up)
+static void serial8250_console_putchar(struct uart_port *port, int ch)
 {
-	unsigned int status, tmout = 10000;
-
-	/* Wait up to 10ms for the character(s) to be sent. */
-	do {
-		status = serial_in(up, UART_LSR);
-
-		if (status & UART_LSR_BI)
-			up->lsr_break_flag = UART_LSR_BI;
-
-		if (--tmout == 0)
-			break;
-		udelay(1);
-	} while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
 
-	/* Wait up to 1s for flow control if necessary */
-	if (up->port.flags & UPF_CONS_FLOW) {
-		tmout = 1000000;
-		while (--tmout &&
-		       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
-			udelay(1);
-	}
+	wait_for_xmitr(up, UART_LSR_THRE);
+	serial_out(up, UART_TX, ch);
 }
 
 /*
@@ -2138,11 +2701,23 @@ static void
 serial8250_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct uart_8250_port *up = &serial8250_ports[co->index];
+	unsigned long flags;
 	unsigned int ier;
-	int i;
+	int locked = 1;
+
+	touch_nmi_watchdog();
+
+	local_irq_save(flags);
+	if (up->port.sysrq) {
+		/* serial8250_handle_port() already took the lock */
+		locked = 0;
+	} else if (oops_in_progress) {
+		locked = spin_trylock(&up->port.lock);
+	} else
+		spin_lock(&up->port.lock);
 
 	/*
-	 *	First save the UER then disable the interrupts
+	 *	First save the IER then disable the interrupts
 	 */
 	ier = serial_in(up, UART_IER);
 
@@ -2151,32 +2726,31 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
 	else
 		serial_out(up, UART_IER, 0);
 
-	/*
-	 *	Now, do each character
-	 */
-	for (i = 0; i < count; i++, s++) {
-		wait_for_xmitr(up);
-
-		/*
-		 *	Send the character out.
-		 *	If a LF, also do CR...
-		 */
-		serial_out(up, UART_TX, *s);
-		if (*s == 10) {
-			wait_for_xmitr(up);
-			serial_out(up, UART_TX, 13);
-		}
-	}
+	uart_console_write(&up->port, s, count, serial8250_console_putchar);
 
 	/*
 	 *	Finally, wait for transmitter to become empty
 	 *	and restore the IER
 	 */
-	wait_for_xmitr(up);
+	wait_for_xmitr(up, BOTH_EMPTY);
 	serial_out(up, UART_IER, ier);
+
+	/*
+	 *	The receive handling will happen properly because the
+	 *	receive ready bit will still be set; it is not cleared
+	 *	on read.  However, modem control will not, we must
+	 *	call it if we have saved something in the saved flags
+	 *	while processing with interrupts off.
+	 */
+	if (up->msr_saved_flags)
+		check_modem_status(up);
+
+	if (locked)
+		spin_unlock(&up->port.lock);
+	local_irq_restore(flags);
 }
 
-static int serial8250_console_setup(struct console *co, char *options)
+static int __init serial8250_console_setup(struct console *co, char *options)
 {
 	struct uart_port *port;
 	int baud = 9600;
@@ -2189,7 +2763,7 @@ static int serial8250_console_setup(struct console *co, char *options)
 	 * if so, search for the first available port that does have
 	 * console support.
 	 */
-	if (co->index >= UART_NR)
+	if (co->index >= nr_uarts)
 		co->index = 0;
 	port = &serial8250_ports[co->index].port;
 	if (!port->iobase && !port->membase)
@@ -2201,12 +2775,17 @@ static int serial8250_console_setup(struct console *co, char *options)
 	return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
-static struct uart_driver serial8250_reg;
+static int serial8250_console_early_setup(void)
+{
+	return serial8250_find_port_for_earlycon();
+}
+
 static struct console serial8250_console = {
 	.name		= "ttyS",
 	.write		= serial8250_console_write,
 	.device		= uart_console_device,
 	.setup		= serial8250_console_setup,
+	.early_setup	= serial8250_console_early_setup,
 	.flags		= CON_PRINTBUFFER,
 	.index		= -1,
 	.data		= &serial8250_reg,
@@ -2214,47 +2793,28 @@ static struct console serial8250_console = {
 
 static int __init serial8250_console_init(void)
 {
+	if (nr_uarts > UART_NR)
+		nr_uarts = UART_NR;
+
 	serial8250_isa_init_ports();
 	register_console(&serial8250_console);
 	return 0;
 }
 console_initcall(serial8250_console_init);
 
-static int __init find_port(struct uart_port *p)
+int serial8250_find_port(struct uart_port *p)
 {
 	int line;
 	struct uart_port *port;
 
-	for (line = 0; line < UART_NR; line++) {
+	for (line = 0; line < nr_uarts; line++) {
 		port = &serial8250_ports[line].port;
-		if (p->iotype == port->iotype &&
-		    p->iobase == port->iobase &&
-		    p->membase == port->membase)
+		if (uart_match_port(p, port))
 			return line;
 	}
 	return -ENODEV;
 }
 
-int __init serial8250_start_console(struct uart_port *port, char *options)
-{
-	int line;
-
-	line = find_port(port);
-	if (line < 0)
-		return -ENODEV;
-
-	add_preferred_console("ttyS", line, options);
-	printk("Adding console on ttyS%d at %s 0x%lx (options '%s')\n",
-		line, port->iotype == UPIO_MEM ? "MMIO" : "I/O port",
-		port->iotype == UPIO_MEM ? (unsigned long) port->mapbase :
-		    (unsigned long) port->iobase, options);
-	if (!(serial8250_console.flags & CON_ENABLED)) {
-		serial8250_console.flags &= ~CON_PRINTBUFFER;
-		register_console(&serial8250_console);
-	}
-	return line;
-}
-
 #define SERIAL8250_CONSOLE	&serial8250_console
 #else
 #define SERIAL8250_CONSOLE	NULL
@@ -2263,29 +2823,52 @@ int __init serial8250_start_console(struct uart_port *port, char *options)
 static struct uart_driver serial8250_reg = {
 	.owner			= THIS_MODULE,
 	.driver_name		= "serial",
-	.devfs_name		= "tts/",
 	.dev_name		= "ttyS",
 	.major			= TTY_MAJOR,
 	.minor			= 64,
-	.nr			= UART_NR,
 	.cons			= SERIAL8250_CONSOLE,
 };
 
+/*
+ * early_serial_setup - early registration for 8250 ports
+ *
+ * Setup an 8250 port structure prior to console initialisation.  Use
+ * after console initialisation will cause undefined behaviour.
+ */
 int __init early_serial_setup(struct uart_port *port)
 {
+	struct uart_port *p;
+
 	if (port->line >= ARRAY_SIZE(serial8250_ports))
 		return -ENODEV;
 
 	serial8250_isa_init_ports();
-	serial8250_ports[port->line].port	= *port;
-	serial8250_ports[port->line].port.ops	= &serial8250_pops;
+	p = &serial8250_ports[port->line].port;
+	p->iobase       = port->iobase;
+	p->membase      = port->membase;
+	p->irq          = port->irq;
+	p->uartclk      = port->uartclk;
+	p->fifosize     = port->fifosize;
+	p->regshift     = port->regshift;
+	p->iotype       = port->iotype;
+	p->flags        = port->flags;
+	p->mapbase      = port->mapbase;
+	p->private_data = port->private_data;
+	p->type		= port->type;
+	p->line		= port->line;
+
+	set_io_from_upio(p);
+	if (port->serial_in)
+		p->serial_in = port->serial_in;
+	if (port->serial_out)
+		p->serial_out = port->serial_out;
+
 	return 0;
 }
 
 /**
  *	serial8250_suspend_port - suspend one serial port
  *	@line:  serial line number
- *      @level: the level of port suspension, as per uart_suspend_port
  *
  *	Suspend one serial port.
  */
@@ -2297,13 +2880,27 @@ void serial8250_suspend_port(int line)
 /**
  *	serial8250_resume_port - resume one serial port
  *	@line:  serial line number
- *      @level: the level of port resumption, as per uart_resume_port
  *
  *	Resume one serial port.
  */
 void serial8250_resume_port(int line)
 {
-	uart_resume_port(&serial8250_reg, &serial8250_ports[line].port);
+	struct uart_8250_port *up = &serial8250_ports[line];
+
+	if (up->capabilities & UART_NATSEMI) {
+		unsigned char tmp;
+
+		/* Ensure it's still in high speed mode */
+		serial_outp(up, UART_LCR, 0xE0);
+
+		tmp = serial_in(up, 0x04); /* EXCR2 */
+		tmp &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
+		tmp |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
+		serial_outp(up, 0x04, tmp);
+
+		serial_outp(up, UART_LCR, 0);
+	}
+	uart_resume_port(&serial8250_reg, &up->port);
 }
 
 /*
@@ -2311,32 +2908,37 @@ void serial8250_resume_port(int line)
  * list is terminated with a zero flags entry, which means we expect
  * all entries to have at least UPF_BOOT_AUTOCONF set.
  */
-static int __devinit serial8250_probe(struct device *dev)
+static int __devinit serial8250_probe(struct platform_device *dev)
 {
-	struct plat_serial8250_port *p = dev->platform_data;
+	struct plat_serial8250_port *p = dev->dev.platform_data;
 	struct uart_port port;
 	int ret, i;
 
 	memset(&port, 0, sizeof(struct uart_port));
 
 	for (i = 0; p && p->flags != 0; p++, i++) {
-		port.iobase	= p->iobase;
-		port.membase	= p->membase;
-		port.irq	= p->irq;
-		port.uartclk	= p->uartclk;
-		port.regshift	= p->regshift;
-		port.iotype	= p->iotype;
-		port.flags	= p->flags;
-		port.mapbase	= p->mapbase;
-		port.hub6	= p->hub6;
-		port.dev	= dev;
+		port.iobase		= p->iobase;
+		port.membase		= p->membase;
+		port.irq		= p->irq;
+		port.uartclk		= p->uartclk;
+		port.regshift		= p->regshift;
+		port.iotype		= p->iotype;
+		port.flags		= p->flags;
+		port.mapbase		= p->mapbase;
+		port.hub6		= p->hub6;
+		port.private_data	= p->private_data;
+		port.type		= p->type;
+		port.serial_in		= p->serial_in;
+		port.serial_out		= p->serial_out;
+		port.dev		= &dev->dev;
 		if (share_irqs)
 			port.flags |= UPF_SHARE_IRQ;
 		ret = serial8250_register_port(&port);
 		if (ret < 0) {
-			dev_err(dev, "unable to register port at index %d "
-				"(IO%lx MEM%lx IRQ%d): %d\n", i,
-				p->iobase, p->mapbase, p->irq, ret);
+			dev_err(&dev->dev, "unable to register port at index %d "
+				"(IO%lx MEM%llx IRQ%d): %d\n", i,
+				p->iobase, (unsigned long long)p->mapbase,
+				p->irq, ret);
 		}
 	}
 	return 0;
@@ -2345,54 +2947,56 @@ static int __devinit serial8250_probe(struct device *dev)
 /*
  * Remove serial ports registered against a platform device.
  */
-static int __devexit serial8250_remove(struct device *dev)
+static int __devexit serial8250_remove(struct platform_device *dev)
 {
 	int i;
 
-	for (i = 0; i < UART_NR; i++) {
+	for (i = 0; i < nr_uarts; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
-		if (up->port.dev == dev)
+		if (up->port.dev == &dev->dev)
 			serial8250_unregister_port(i);
 	}
 	return 0;
 }
 
-static int serial8250_suspend(struct device *dev, pm_message_t state)
+static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
 {
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
-		if (up->port.type != PORT_UNKNOWN && up->port.dev == dev)
+		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
 			uart_suspend_port(&serial8250_reg, &up->port);
 	}
 
 	return 0;
 }
 
-static int serial8250_resume(struct device *dev)
+static int serial8250_resume(struct platform_device *dev)
 {
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
-		if (up->port.type != PORT_UNKNOWN && up->port.dev == dev)
-			uart_resume_port(&serial8250_reg, &up->port);
+		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
+			serial8250_resume_port(i);
 	}
 
 	return 0;
 }
 
-static struct device_driver serial8250_isa_driver = {
-	.name		= "serial8250",
-	.bus		= &platform_bus_type,
+static struct platform_driver serial8250_isa_driver = {
 	.probe		= serial8250_probe,
 	.remove		= __devexit_p(serial8250_remove),
 	.suspend	= serial8250_suspend,
 	.resume		= serial8250_resume,
+	.driver		= {
+		.name	= "serial8250",
+		.owner	= THIS_MODULE,
+	},
 };
 
 /*
@@ -2406,7 +3010,7 @@ static struct platform_device *serial8250_isa_devs;
  * 16x50 serial ports to be configured at run-time, to support PCMCIA
  * modems and PCI multiport cards.
  */
-static DECLARE_MUTEX(serial_sem);
+static DEFINE_MUTEX(serial_mutex);
 
 static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
 {
@@ -2415,7 +3019,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
 	/*
 	 * First, find a port entry which matches.
 	 */
-	for (i = 0; i < UART_NR; i++)
+	for (i = 0; i < nr_uarts; i++)
 		if (uart_match_port(&serial8250_ports[i].port, port))
 			return &serial8250_ports[i];
 
@@ -2424,7 +3028,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
 	 * free entry.  We look for one which hasn't been previously
 	 * used (indicated by zero iobase).
 	 */
-	for (i = 0; i < UART_NR; i++)
+	for (i = 0; i < nr_uarts; i++)
 		if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
 		    serial8250_ports[i].port.iobase == 0)
 			return &serial8250_ports[i];
@@ -2433,7 +3037,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
 	 * That also failed.  Last resort is to find any entry which
 	 * doesn't have a real port associated with it.
 	 */
-	for (i = 0; i < UART_NR; i++)
+	for (i = 0; i < nr_uarts; i++)
 		if (serial8250_ports[i].port.type == PORT_UNKNOWN)
 			return &serial8250_ports[i];
 
@@ -2461,29 +3065,44 @@ int serial8250_register_port(struct uart_port *port)
 	if (port->uartclk == 0)
 		return -EINVAL;
 
-	down(&serial_sem);
+	mutex_lock(&serial_mutex);
 
 	uart = serial8250_find_match_or_unused(port);
 	if (uart) {
 		uart_remove_one_port(&serial8250_reg, &uart->port);
 
-		uart->port.iobase   = port->iobase;
-		uart->port.membase  = port->membase;
-		uart->port.irq      = port->irq;
-		uart->port.uartclk  = port->uartclk;
-		uart->port.fifosize = port->fifosize;
-		uart->port.regshift = port->regshift;
-		uart->port.iotype   = port->iotype;
-		uart->port.flags    = port->flags | UPF_BOOT_AUTOCONF;
-		uart->port.mapbase  = port->mapbase;
+		uart->port.iobase       = port->iobase;
+		uart->port.membase      = port->membase;
+		uart->port.irq          = port->irq;
+		uart->port.uartclk      = port->uartclk;
+		uart->port.fifosize     = port->fifosize;
+		uart->port.regshift     = port->regshift;
+		uart->port.iotype       = port->iotype;
+		uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
+		uart->port.mapbase      = port->mapbase;
+		uart->port.private_data = port->private_data;
 		if (port->dev)
 			uart->port.dev = port->dev;
 
+		if (port->flags & UPF_FIXED_TYPE) {
+			uart->port.type = port->type;
+			uart->port.fifosize = uart_config[port->type].fifo_size;
+			uart->capabilities = uart_config[port->type].flags;
+			uart->tx_loadsz = uart_config[port->type].tx_loadsz;
+		}
+
+		set_io_from_upio(&uart->port);
+		/* Possibly override default I/O functions.  */
+		if (port->serial_in)
+			uart->port.serial_in = port->serial_in;
+		if (port->serial_out)
+			uart->port.serial_out = port->serial_out;
+
 		ret = uart_add_one_port(&serial8250_reg, &uart->port);
 		if (ret == 0)
 			ret = uart->port.line;
 	}
-	up(&serial_sem);
+	mutex_unlock(&serial_mutex);
 
 	return ret;
 }
@@ -2500,7 +3119,7 @@ void serial8250_unregister_port(int line)
 {
 	struct uart_8250_port *uart = &serial8250_ports[line];
 
-	down(&serial_sem);
+	mutex_lock(&serial_mutex);
 	uart_remove_one_port(&serial8250_reg, &uart->port);
 	if (serial8250_isa_devs) {
 		uart->port.flags &= ~UPF_BOOT_AUTOCONF;
@@ -2510,42 +3129,57 @@ void serial8250_unregister_port(int line)
 	} else {
 		uart->port.dev = NULL;
 	}
-	up(&serial_sem);
+	mutex_unlock(&serial_mutex);
 }
 EXPORT_SYMBOL(serial8250_unregister_port);
 
 static int __init serial8250_init(void)
 {
-	int ret, i;
+	int ret;
 
-	printk(KERN_INFO "Serial: 8250/16550 driver $Revision: 1.90 $ "
-		"%d ports, IRQ sharing %sabled\n", (int) UART_NR,
-		share_irqs ? "en" : "dis");
+	if (nr_uarts > UART_NR)
+		nr_uarts = UART_NR;
 
-	for (i = 0; i < NR_IRQS; i++)
-		spin_lock_init(&irq_lists[i].lock);
+	printk(KERN_INFO "Serial: 8250/16550 driver, "
+		"%d ports, IRQ sharing %sabled\n", nr_uarts,
+		share_irqs ? "en" : "dis");
 
+#ifdef CONFIG_SPARC
+	ret = sunserial_register_minors(&serial8250_reg, UART_NR);
+#else
+	serial8250_reg.nr = UART_NR;
 	ret = uart_register_driver(&serial8250_reg);
+#endif
 	if (ret)
 		goto out;
 
-	serial8250_isa_devs = platform_device_register_simple("serial8250",
-					 PLAT8250_DEV_LEGACY, NULL, 0);
-	if (IS_ERR(serial8250_isa_devs)) {
-		ret = PTR_ERR(serial8250_isa_devs);
-		goto unreg;
+	serial8250_isa_devs = platform_device_alloc("serial8250",
+						    PLAT8250_DEV_LEGACY);
+	if (!serial8250_isa_devs) {
+		ret = -ENOMEM;
+		goto unreg_uart_drv;
 	}
 
+	ret = platform_device_add(serial8250_isa_devs);
+	if (ret)
+		goto put_dev;
+
 	serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
 
-	ret = driver_register(&serial8250_isa_driver);
+	ret = platform_driver_register(&serial8250_isa_driver);
 	if (ret == 0)
 		goto out;
 
-	platform_device_unregister(serial8250_isa_devs);
- unreg:
+	platform_device_del(serial8250_isa_devs);
+put_dev:
+	platform_device_put(serial8250_isa_devs);
+unreg_uart_drv:
+#ifdef CONFIG_SPARC
+	sunserial_unregister_minors(&serial8250_reg, UART_NR);
+#else
 	uart_unregister_driver(&serial8250_reg);
- out:
+#endif
+out:
 	return ret;
 }
 
@@ -2560,10 +3194,14 @@ static void __exit serial8250_exit(void)
 	 */
 	serial8250_isa_devs = NULL;
 
-	driver_unregister(&serial8250_isa_driver);
+	platform_driver_unregister(&serial8250_isa_driver);
 	platform_device_unregister(isa_dev);
 
+#ifdef CONFIG_SPARC
+	sunserial_unregister_minors(&serial8250_reg, UART_NR);
+#else
 	uart_unregister_driver(&serial8250_reg);
+#endif
 }
 
 module_init(serial8250_init);
@@ -2573,12 +3211,15 @@ EXPORT_SYMBOL(serial8250_suspend_port);
 EXPORT_SYMBOL(serial8250_resume_port);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Generic 8250/16x50 serial driver $Revision: 1.90 $");
+MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
 
 module_param(share_irqs, uint, 0644);
 MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices"
 	" (unsafe)");
 
+module_param(nr_uarts, uint, 0644);
+MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
+
 #ifdef CONFIG_SERIAL_8250_RSA
 module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444);
 MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");