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[PATCH] sb1250-duart.c: SB1250 DUART serial support

To: Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH] sb1250-duart.c: SB1250 DUART serial support
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Thu, 12 Jul 2007 18:39:00 +0100 (BST)
Cc: Ralf Baechle <ralf@linux-mips.org>, Mark Mason <mason@broadcom.com>, Andy Whitcroft <apw@shadowen.org>, Randy Dunlap <rdunlap@xenotime.net>, Joel Schopp <jschopp@austin.ibm.com>, linux-mips@linux-mips.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
 This is a driver for the SB1250 DUART, a dual serial port implementation 
included in the Broadcom family of SOCs descending from the SiByte SB1250 
MIPS64 chip multiprocessor.  It is a new implementation replacing the 
old-fashioned driver currently present in the linux-mips.org tree.  It 
supports all the usual features one would expect from a(n asynchronous) 
serial driver, including modem line control (as far as hardware supports 
it -- there is edge detection logic missing from the DCD and RI lines and 
the driver does not implement polling of these lines at the moment), the 
serial console, BREAK transmission and reception, including the magic 
SysRq.  The receive FIFO threshold is not maintained though.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
---
Hi,

 The driver was tested with a SWARM board which uses a BCM1250 SOC (which 
is dual MIPS64 CMP) and has both ports of the single DUART implemented 
wired externally.  Both were tested.  Testing included using the ports as 
terminal lines at 1200bps (which is the ports minimum), 115200bps and a 
couple of random speeds inbetween.  The modem lines were verified to 
operate correctly.  No testing was performed with a use as a network 
interface, like with SLIP or PPP.

 The driver builds succesfully and without warnings both as integrated and 
as modular.  There are a couple of -W warnings, but they are results of 
some inconsistencies (signedness mismatches) in the serial core.  It 
produces no sparse warnings.  There are a few benign warnings from 
patchcheck.pl, one of which is, I believe, a bug in the script itself 
(maintainers cc-ed):

printk() should include KERN_ facility level
#750: FILE: drivers/serial/sb1250-duart.c:675:
+               printk(err);

The <asm/io.h> warning is, I gather, not a problem and warnings about the 
_SB_MAKEMASK() macro should be addressed as a separate change.

 The driver runs correctly with a 64-bit SMP kernel in a big- and 
little-endian configuration (with spinlock debugging enabled).  Modular 
configuration was not tested at the run time.  UP configuration was not 
tested at all, but is not expected to give any troubles.

 I have asked for testing at the linux-mips list, but rather than results 
I have received some pressure to push the patch regardless.  So here it 
goes. ;-)

 Please apply.

  Maciej

patch-2.6.22-20070712-serial-sb1250-duart-28
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/arch/mips/sibyte/bcm1480/setup.c 
linux-2.6.22-20070712/arch/mips/sibyte/bcm1480/setup.c
--- linux-2.6.22-20070712.macro/arch/mips/sibyte/bcm1480/setup.c        
2007-07-12 02:55:17.000000000 +0000
+++ linux-2.6.22-20070712/arch/mips/sibyte/bcm1480/setup.c      2007-07-12 
14:26:21.000000000 +0000
@@ -31,6 +31,7 @@
 unsigned int sb1_pass;
 unsigned int soc_pass;
 unsigned int soc_type;
+EXPORT_SYMBOL(soc_type);
 unsigned int periph_rev;
 unsigned int zbbus_mhz;
 
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/arch/mips/sibyte/sb1250/setup.c 
linux-2.6.22-20070712/arch/mips/sibyte/sb1250/setup.c
--- linux-2.6.22-20070712.macro/arch/mips/sibyte/sb1250/setup.c 2007-07-12 
02:55:17.000000000 +0000
+++ linux-2.6.22-20070712/arch/mips/sibyte/sb1250/setup.c       2007-07-12 
14:26:21.000000000 +0000
@@ -31,6 +31,7 @@
 unsigned int sb1_pass;
 unsigned int soc_pass;
 unsigned int soc_type;
+EXPORT_SYMBOL(soc_type);
 unsigned int periph_rev;
 unsigned int zbbus_mhz;
 EXPORT_SYMBOL(zbbus_mhz);
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/drivers/serial/Kconfig 
linux-2.6.22-20070712/drivers/serial/Kconfig
--- linux-2.6.22-20070712.macro/drivers/serial/Kconfig  2007-07-12 
02:55:29.000000000 +0000
+++ linux-2.6.22-20070712/drivers/serial/Kconfig        2007-07-12 
17:34:55.000000000 +0000
@@ -324,6 +324,34 @@ config SERIAL_AMBA_PL011_CONSOLE
          your boot loader (lilo or loadlin) about how to pass options to the
          kernel at boot time.)
 
+config SERIAL_SB1250_DUART
+       tristate "BCM1xxx on-chip DUART serial support"
+       depends on SIBYTE_SB1xxx_SOC=y
+       select SERIAL_CORE
+       default y
+       ---help---
+         Support for the asynchronous serial interface (DUART) included in
+         the BCM1250 and derived System-On-a-Chip (SOC) devices.  Note that
+         the letter D in DUART stands for "dual", which is how the device
+         is implemented.  Depending on the SOC configuration there may be
+         one or more DUARTs available of which all are handled.
+
+         If unsure, say Y.  To compile this driver as a module, choose M here:
+         the module will be called sb1250-duart.
+
+config SERIAL_SB1250_DUART_CONSOLE
+       bool "Support for console on a BCM1xxx DUART serial port"
+       depends on SERIAL_SB1250_DUART=y
+       select SERIAL_CORE_CONSOLE
+       default y
+       ---help---
+         If you say Y here, it will be possible to use a serial port as the
+         system console (the system console is the device which receives all
+         kernel messages and warnings and which allows logins in single user
+         mode).
+
+         If unsure, say Y.
+
 config SERIAL_ATMEL
        bool "AT91 / AT32 on-chip serial port support"
        depends on (ARM && ARCH_AT91) || AVR32
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/drivers/serial/Makefile 
linux-2.6.22-20070712/drivers/serial/Makefile
--- linux-2.6.22-20070712.macro/drivers/serial/Makefile 2007-07-12 
02:55:29.000000000 +0000
+++ linux-2.6.22-20070712/drivers/serial/Makefile       2007-07-12 
14:26:21.000000000 +0000
@@ -23,6 +23,7 @@ obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mc
 obj-$(CONFIG_SERIAL_8250_AU1X00) += 8250_au1x00.o
 obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
 obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
+obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
 obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
 obj-$(CONFIG_SERIAL_PXA) += pxa.o
 obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/drivers/serial/sb1250-duart.c 
linux-2.6.22-20070712/drivers/serial/sb1250-duart.c
--- linux-2.6.22-20070712.macro/drivers/serial/sb1250-duart.c   1970-01-01 
00:00:00.000000000 +0000
+++ linux-2.6.22-20070712/drivers/serial/sb1250-duart.c 2007-07-11 
02:17:35.000000000 +0000
@@ -0,0 +1,972 @@
+/*
+ *     drivers/serial/sb1250-duart.c
+ *
+ *     Support for the asynchronous serial interface (DUART) included
+ *     in the BCM1250 and derived System-On-a-Chip (SOC) devices.
+ *
+ *     Copyright (c) 2007  Maciej W. Rozycki
+ *
+ *     Derived from drivers/char/sb1250_duart.c for which the following
+ *     copyright applies:
+ *
+ *     Copyright (c) 2000, 2001, 2002, 2003, 2004  Broadcom Corporation
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License
+ *     as published by the Free Software Foundation; either version
+ *     2 of the License, or (at your option) any later version.
+ *
+ *     References:
+ *
+ *     "BCM1250/BCM1125/BCM1125H User Manual", Broadcom Corporation
+ */
+
+#if defined(CONFIG_SERIAL_SB1250_DUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/spinlock.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/types.h>
+
+#include <asm/atomic.h>
+#include <asm/io.h>
+#include <asm/war.h>
+
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_uart.h>
+#include <asm/sibyte/swarm.h>
+
+
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#include <asm/sibyte/bcm1480_regs.h>
+#include <asm/sibyte/bcm1480_int.h>
+
+#define SBD_CHANREGS(line)     A_BCM1480_DUART_CHANREG((line), 0)
+#define SBD_CTRLREGS(line)     A_BCM1480_DUART_CTRLREG((line), 0)
+#define SBD_INT(line)          (K_BCM1480_INT_UART_0 + (line))
+
+#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+
+#define SBD_CHANREGS(line)     A_DUART_CHANREG((line), 0)
+#define SBD_CTRLREGS(line)     A_DUART_CTRLREG(0)
+#define SBD_INT(line)          (K_INT_UART_0 + (line))
+
+#else
+#error invalid SB1250 UART configuration
+
+#endif
+
+
+MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
+MODULE_DESCRIPTION("BCM1xxx on-chip DUART serial driver");
+MODULE_LICENSE("GPL");
+
+
+#define DUART_MAX_CHIP 2
+#define DUART_MAX_SIDE 2
+
+/*
+ * Per-port state.
+ */
+struct sbd_port {
+       struct sbd_duart        *duart;
+       struct uart_port        port;
+       unsigned char __iomem   *memctrl;
+       int                     tx_stopped;
+       int                     initialised;
+};
+
+/*
+ * Per-DUART state for the shared register space.
+ */
+struct sbd_duart {
+       struct sbd_port         sport[2];
+       unsigned long           mapctrl;
+       atomic_t                map_guard;
+};
+
+#define to_sport(uport) container_of(uport, struct sbd_port, port)
+
+static struct sbd_duart sbd_duarts[DUART_MAX_CHIP];
+
+#define __unused __attribute__((__unused__))
+
+
+/*
+ * Reading and writing SB1250 DUART registers.
+ *
+ * There are three register spaces: two per-channel ones and
+ * a shared one.  We have to define accessors appropriately.
+ * All registers are 64-bit and all but the Baud Rate Clock
+ * registers only define 8 least significant bits.  There is
+ * also a workaround to take into account.  Raw accessors use
+ * the full register width, but cooked ones truncate it
+ * intentionally so that the rest of the driver does not care.
+ */
+static u64 __read_sbdchn(struct sbd_port *sport, int reg)
+{
+       void __iomem *csr = sport->port.membase + reg;
+
+       return __raw_readq(csr);
+}
+
+static u64 __read_sbdshr(struct sbd_port *sport, int reg)
+{
+       void __iomem *csr = sport->memctrl + reg;
+
+       return __raw_readq(csr);
+}
+
+static void __write_sbdchn(struct sbd_port *sport, int reg, u64 value)
+{
+       void __iomem *csr = sport->port.membase + reg;
+
+       __raw_writeq(value, csr);
+}
+
+static void __write_sbdshr(struct sbd_port *sport, int reg, u64 value)
+{
+       void __iomem *csr = sport->memctrl + reg;
+
+       __raw_writeq(value, csr);
+}
+
+/*
+ * In bug 1956, we get glitches that can mess up uart registers.  This
+ * "read-mode-reg after any register access" is an accepted workaround.
+ */
+static void __war_sbd1956(struct sbd_port *sport)
+{
+       __read_sbdchn(sport, R_DUART_MODE_REG_1);
+       __read_sbdchn(sport, R_DUART_MODE_REG_2);
+}
+
+static unsigned char read_sbdchn(struct sbd_port *sport, int reg)
+{
+       unsigned char retval;
+
+       retval = __read_sbdchn(sport, reg);
+       if (SIBYTE_1956_WAR)
+               __war_sbd1956(sport);
+       return retval;
+}
+
+static unsigned char read_sbdshr(struct sbd_port *sport, int reg)
+{
+       unsigned char retval;
+
+       retval = __read_sbdshr(sport, reg);
+       if (SIBYTE_1956_WAR)
+               __war_sbd1956(sport);
+       return retval;
+}
+
+static void write_sbdchn(struct sbd_port *sport, int reg, unsigned int value)
+{
+       __write_sbdchn(sport, reg, value);
+       if (SIBYTE_1956_WAR)
+               __war_sbd1956(sport);
+}
+
+static void write_sbdshr(struct sbd_port *sport, int reg, unsigned int value)
+{
+       __write_sbdshr(sport, reg, value);
+       if (SIBYTE_1956_WAR)
+               __war_sbd1956(sport);
+}
+
+
+static int sbd_receive_ready(struct sbd_port *sport)
+{
+       return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_RX_RDY;
+}
+
+static int sbd_receive_drain(struct sbd_port *sport)
+{
+       int loops = 10000;
+
+       while (sbd_receive_ready(sport) && loops--)
+               read_sbdchn(sport, R_DUART_RX_HOLD);
+       return loops;
+}
+
+static int __unused sbd_transmit_ready(struct sbd_port *sport)
+{
+       return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_RDY;
+}
+
+static int __unused sbd_transmit_drain(struct sbd_port *sport)
+{
+       int loops = 10000;
+
+       while (!sbd_transmit_ready(sport) && loops--)
+               udelay(2);
+       return loops;
+}
+
+static int sbd_transmit_empty(struct sbd_port *sport)
+{
+       return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_EMT;
+}
+
+static int sbd_line_drain(struct sbd_port *sport)
+{
+       int loops = 10000;
+
+       while (!sbd_transmit_empty(sport) && loops--)
+               udelay(2);
+       return loops;
+}
+
+
+static unsigned int sbd_tx_empty(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       return sbd_transmit_empty(sport) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int sbd_get_mctrl(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+       unsigned int mctrl, status;
+
+       status = read_sbdshr(sport, R_DUART_IN_PORT);
+       status >>= (uport->line) % 2;
+       mctrl = (!(status & M_DUART_IN_PIN0_VAL) ? TIOCM_CTS : 0) |
+               (!(status & M_DUART_IN_PIN4_VAL) ? TIOCM_CAR : 0) |
+               (!(status & M_DUART_RIN0_PIN) ? TIOCM_RNG : 0) |
+               (!(status & M_DUART_IN_PIN2_VAL) ? TIOCM_DSR : 0);
+       return mctrl;
+}
+
+static void sbd_set_mctrl(struct uart_port *uport, unsigned int mctrl)
+{
+       struct sbd_port *sport = to_sport(uport);
+       unsigned int clr = 0, set = 0, mode2;
+
+       if (mctrl & TIOCM_DTR)
+               set |= M_DUART_SET_OPR2;
+       else
+               clr |= M_DUART_CLR_OPR2;
+       if (mctrl & TIOCM_RTS)
+               set |= M_DUART_SET_OPR0;
+       else
+               clr |= M_DUART_CLR_OPR0;
+       clr <<= (uport->line) % 2;
+       set <<= (uport->line) % 2;
+
+       mode2 = read_sbdchn(sport, R_DUART_MODE_REG_2);
+       mode2 &= ~M_DUART_CHAN_MODE;
+       if (mctrl & TIOCM_LOOP)
+               mode2 |= V_DUART_CHAN_MODE_LCL_LOOP;
+       else
+               mode2 |= V_DUART_CHAN_MODE_NORMAL;
+
+       write_sbdshr(sport, R_DUART_CLEAR_OPR, clr);
+       write_sbdshr(sport, R_DUART_SET_OPR, set);
+       write_sbdchn(sport, R_DUART_MODE_REG_2, mode2);
+}
+
+static void sbd_stop_tx(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS);
+       sport->tx_stopped = 1;
+};
+
+static void sbd_start_tx(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+       unsigned int mask;
+
+       /* Enable tx interrupts.  */
+       mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
+       mask |= M_DUART_IMR_TX;
+       write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
+
+       /* Go!, go!, go!...  */
+       write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN);
+       sport->tx_stopped = 0;
+};
+
+static void sbd_stop_rx(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), 0);
+};
+
+static void sbd_enable_ms(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       write_sbdchn(sport, R_DUART_AUXCTL_X,
+                    M_DUART_CIN_CHNG_ENA | M_DUART_CTS_CHNG_ENA);
+}
+
+static void sbd_break_ctl(struct uart_port *uport, int break_state)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       if (break_state == -1)
+               write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_START_BREAK);
+       else
+               write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_STOP_BREAK);
+}
+
+
+static void sbd_receive_chars(struct sbd_port *sport)
+{
+       struct uart_port *uport = &sport->port;
+       struct uart_icount *icount;
+       unsigned int status, ch, flag;
+       int count;
+
+       for (count = 16; count; count--) {
+               status = read_sbdchn(sport, R_DUART_STATUS);
+               if (!(status & M_DUART_RX_RDY))
+                       break;
+
+               ch = read_sbdchn(sport, R_DUART_RX_HOLD);
+
+               flag = TTY_NORMAL;
+
+               icount = &uport->icount;
+               icount->rx++;
+
+               if (unlikely(status &
+                            (M_DUART_RCVD_BRK | M_DUART_FRM_ERR |
+                             M_DUART_PARITY_ERR | M_DUART_OVRUN_ERR))) {
+                       if (status & M_DUART_RCVD_BRK) {
+                               icount->brk++;
+                               if (uart_handle_break(uport))
+                                       continue;
+                       } else if (status & M_DUART_FRM_ERR)
+                               icount->frame++;
+                       else if (status & M_DUART_PARITY_ERR)
+                               icount->parity++;
+                       if (status & M_DUART_OVRUN_ERR)
+                               icount->overrun++;
+
+                       status &= uport->read_status_mask;
+                       if (status & M_DUART_RCVD_BRK)
+                               flag = TTY_BREAK;
+                       else if (status & M_DUART_FRM_ERR)
+                               flag = TTY_FRAME;
+                       else if (status & M_DUART_PARITY_ERR)
+                               flag = TTY_PARITY;
+               }
+
+               if (uart_handle_sysrq_char(uport, ch))
+                       continue;
+
+               uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
+       }
+
+       tty_flip_buffer_push(uport->info->tty);
+}
+
+static void sbd_transmit_chars(struct sbd_port *sport)
+{
+       struct uart_port *uport = &sport->port;
+       struct circ_buf *xmit = &sport->port.info->xmit;
+       unsigned int mask;
+       int stop_tx;
+
+       /* XON/XOFF chars.  */
+       if (sport->port.x_char) {
+               write_sbdchn(sport, R_DUART_TX_HOLD, sport->port.x_char);
+               sport->port.icount.tx++;
+               sport->port.x_char = 0;
+               return;
+       }
+
+       /* If nothing to do or stopped or hardware stopped.  */
+       stop_tx = (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port));
+
+       /* Send char.  */
+       if (!stop_tx) {
+               write_sbdchn(sport, R_DUART_TX_HOLD, xmit->buf[xmit->tail]);
+               xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+               sport->port.icount.tx++;
+
+               if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                       uart_write_wakeup(&sport->port);
+       }
+
+       /* Are we are done?  */
+       if (stop_tx || uart_circ_empty(xmit)) {
+               /* Disable tx interrupts.  */
+               mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
+               mask &= ~M_DUART_IMR_TX;
+               write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
+       }
+}
+
+static void sbd_status_handle(struct sbd_port *sport)
+{
+       struct uart_port *uport = &sport->port;
+       unsigned int delta;
+
+       delta = read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
+       delta >>= (uport->line) % 2;
+
+       if (delta & (M_DUART_IN_PIN0_VAL << S_DUART_IN_PIN_CHNG))
+               uart_handle_cts_change(uport, !(delta & M_DUART_IN_PIN0_VAL));
+
+       if (delta & (M_DUART_IN_PIN2_VAL << S_DUART_IN_PIN_CHNG))
+               uport->icount.dsr++;
+
+       if (delta & ((M_DUART_IN_PIN2_VAL | M_DUART_IN_PIN0_VAL) <<
+                    S_DUART_IN_PIN_CHNG))
+               wake_up_interruptible(&uport->info->delta_msr_wait);
+}
+
+static irqreturn_t sbd_interrupt(int irq, void *dev_id)
+{
+       struct sbd_port *sport = dev_id;
+       struct uart_port *uport = &sport->port;
+       irqreturn_t status = IRQ_NONE;
+       unsigned int intstat;
+       int count;
+
+       for (count = 16; count; count--) {
+               intstat = read_sbdshr(sport,
+                                     R_DUART_ISRREG((uport->line) % 2));
+               intstat &= read_sbdshr(sport,
+                                      R_DUART_IMRREG((uport->line) % 2));
+               intstat &= M_DUART_ISR_ALL;
+               if (!intstat)
+                       break;
+
+               if (intstat & M_DUART_ISR_RX)
+                       sbd_receive_chars(sport);
+               if (intstat & M_DUART_ISR_IN)
+                       sbd_status_handle(sport);
+               if (intstat & M_DUART_ISR_TX)
+                       sbd_transmit_chars(sport);
+
+               status = IRQ_HANDLED;
+       }
+
+       return status;
+}
+
+
+static int sbd_startup(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+       unsigned int mode1;
+       int ret;
+
+       ret = request_irq(sport->port.irq, sbd_interrupt,
+                         IRQF_SHARED, "sb1250-duart", sport);
+       if (ret)
+               return ret;
+
+       /* Clear the receive FIFO.  */
+       sbd_receive_drain(sport);
+
+       /* Clear the interrupt registers.  */
+       write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT);
+       read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
+
+       /* Set rx/tx interrupt to FIFO available.  */
+       mode1 = read_sbdchn(sport, R_DUART_MODE_REG_1);
+       mode1 &= ~(M_DUART_RX_IRQ_SEL_RXFULL | M_DUART_TX_IRQ_SEL_TXEMPT);
+       write_sbdchn(sport, R_DUART_MODE_REG_1, mode1);
+
+       /* Disable tx, enable rx.  */
+       write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_EN);
+       sport->tx_stopped = 1;
+
+       /* Enable interrupts.  */
+       write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
+                    M_DUART_IMR_IN | M_DUART_IMR_RX);
+
+       return 0;
+}
+
+static void sbd_shutdown(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
+       sport->tx_stopped = 1;
+       free_irq(sport->port.irq, sport);
+}
+
+
+static void sbd_init_port(struct sbd_port *sport)
+{
+       struct uart_port *uport = &sport->port;
+
+       if (sport->initialised)
+               return;
+
+       /* There is no DUART reset feature, so just set some sane defaults.  */
+       write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_TX);
+       write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_RX);
+       write_sbdchn(sport, R_DUART_MODE_REG_1, V_DUART_BITS_PER_CHAR_8);
+       write_sbdchn(sport, R_DUART_MODE_REG_2, 0);
+       write_sbdchn(sport, R_DUART_FULL_CTL,
+                    V_DUART_INT_TIME(0) | V_DUART_SIG_FULL(15));
+       write_sbdchn(sport, R_DUART_OPCR_X, 0);
+       write_sbdchn(sport, R_DUART_AUXCTL_X, 0);
+       write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), 0);
+
+       sport->initialised = 1;
+}
+
+static void sbd_set_termios(struct uart_port *uport, struct ktermios *termios,
+                           struct ktermios *old_termios)
+{
+       struct sbd_port *sport = to_sport(uport);
+       unsigned int mode1 = 0, mode2 = 0, aux = 0;
+       unsigned int mode1mask = 0, mode2mask = 0, auxmask = 0;
+       unsigned int oldmode1, oldmode2, oldaux;
+       unsigned int baud, brg;
+       unsigned int command;
+
+       mode1mask |= ~(M_DUART_PARITY_MODE | M_DUART_PARITY_TYPE_ODD |
+                      M_DUART_BITS_PER_CHAR);
+       mode2mask |= ~M_DUART_STOP_BIT_LEN_2;
+       auxmask |= ~M_DUART_CTS_CHNG_ENA;
+
+       /* Byte size.  */
+       switch (termios->c_cflag & CSIZE) {
+       case CS5:
+       case CS6:
+               /* Unsupported, leave unchanged.  */
+               mode1mask |= M_DUART_PARITY_MODE;
+               break;
+       case CS7:
+               mode1 |= V_DUART_BITS_PER_CHAR_7;
+               break;
+       case CS8:
+       default:
+               mode1 |= V_DUART_BITS_PER_CHAR_8;
+               break;
+       }
+
+       /* Parity and stop bits.  */
+       if (termios->c_cflag & CSTOPB)
+               mode2 |= M_DUART_STOP_BIT_LEN_2;
+       else
+               mode2 |= M_DUART_STOP_BIT_LEN_1;
+       if (termios->c_cflag & PARENB)
+               mode1 |= V_DUART_PARITY_MODE_ADD;
+       else
+               mode1 |= V_DUART_PARITY_MODE_NONE;
+       if (termios->c_cflag & PARODD)
+               mode1 |= M_DUART_PARITY_TYPE_ODD;
+       else
+               mode1 |= M_DUART_PARITY_TYPE_EVEN;
+
+       baud = uart_get_baud_rate(uport, termios, old_termios, 1200, 5000000);
+       brg = V_DUART_BAUD_RATE(baud);
+       /* The actual lower bound is 1221bps, so compensate.  */
+       if (brg > M_DUART_CLK_COUNTER)
+               brg = M_DUART_CLK_COUNTER;
+
+       uart_update_timeout(uport, termios->c_cflag, baud);
+
+       uport->read_status_mask = M_DUART_OVRUN_ERR;
+       if (termios->c_iflag & INPCK)
+               uport->read_status_mask |= M_DUART_FRM_ERR |
+                                          M_DUART_PARITY_ERR;
+       if (termios->c_iflag & (BRKINT | PARMRK))
+               uport->read_status_mask |= M_DUART_RCVD_BRK;
+
+       uport->ignore_status_mask = 0;
+       if (termios->c_iflag & IGNPAR)
+               uport->ignore_status_mask |= M_DUART_FRM_ERR |
+                                            M_DUART_PARITY_ERR;
+       if (termios->c_iflag & IGNBRK) {
+               uport->ignore_status_mask |= M_DUART_RCVD_BRK;
+               if (termios->c_iflag & IGNPAR)
+                       uport->ignore_status_mask |= M_DUART_OVRUN_ERR;
+       }
+
+       if (termios->c_cflag & CREAD)
+               command = M_DUART_RX_EN;
+       else
+               command = M_DUART_RX_DIS;
+
+       if (termios->c_cflag & CRTSCTS)
+               aux |= M_DUART_CTS_CHNG_ENA;
+       else
+               aux &= ~M_DUART_CTS_CHNG_ENA;
+
+       spin_lock(&uport->lock);
+
+       if (sport->tx_stopped)
+               command |= M_DUART_TX_DIS;
+       else
+               command |= M_DUART_TX_EN;
+
+       oldmode1 = read_sbdchn(sport, R_DUART_MODE_REG_1) & mode1mask;
+       oldmode2 = read_sbdchn(sport, R_DUART_MODE_REG_2) & mode2mask;
+       oldaux = read_sbdchn(sport, R_DUART_AUXCTL_X) & auxmask;
+
+       if (!sport->tx_stopped)
+               sbd_line_drain(sport);
+       write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
+
+       write_sbdchn(sport, R_DUART_MODE_REG_1, mode1 | oldmode1);
+       write_sbdchn(sport, R_DUART_MODE_REG_2, mode2 | oldmode2);
+       write_sbdchn(sport, R_DUART_CLK_SEL, brg);
+       write_sbdchn(sport, R_DUART_AUXCTL_X, aux | oldaux);
+
+       write_sbdchn(sport, R_DUART_CMD, command);
+
+       spin_unlock(&uport->lock);
+}
+
+
+static const char *sbd_type(struct uart_port *uport)
+{
+       return "SB1250 DUART";
+}
+
+static void sbd_release_port(struct uart_port *uport)
+{
+       struct sbd_port *sport = to_sport(uport);
+       struct sbd_duart *duart = sport->duart;
+       int map_guard;
+
+       iounmap(sport->memctrl);
+       sport->memctrl = NULL;
+       iounmap(uport->membase);
+       uport->membase = NULL;
+
+       map_guard = atomic_add_return(-1, &duart->map_guard);
+       if (!map_guard)
+               release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING);
+       release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
+}
+
+static int sbd_map_port(struct uart_port *uport)
+{
+       static const char *err = KERN_ERR "sbd: Cannot map MMIO\n";
+       struct sbd_port *sport = to_sport(uport);
+       struct sbd_duart *duart = sport->duart;
+
+       if (!uport->membase)
+               uport->membase = ioremap_nocache(uport->mapbase,
+                                                DUART_CHANREG_SPACING);
+       if (!uport->membase) {
+               printk(err);
+               return -ENOMEM;
+       }
+
+       if (!sport->memctrl)
+               sport->memctrl = ioremap_nocache(duart->mapctrl,
+                                                DUART_CHANREG_SPACING);
+       if (!sport->memctrl) {
+               printk(err);
+               iounmap(uport->membase);
+               uport->membase = NULL;
+               return -ENOMEM;
+       }
+
+       return 0;
+}
+
+static int sbd_request_port(struct uart_port *uport)
+{
+       static const char *err = KERN_ERR
+                                "sbd: Unable to reserve MMIO resource\n";
+       struct sbd_duart *duart = to_sport(uport)->duart;
+       int map_guard;
+       int ret = 0;
+
+       if (!request_mem_region(uport->mapbase, DUART_CHANREG_SPACING,
+                               "sb1250-duart")) {
+               printk(err);
+               return -EBUSY;
+       }
+       map_guard = atomic_add_return(1, &duart->map_guard);
+       if (map_guard == 1) {
+               if (!request_mem_region(duart->mapctrl, DUART_CHANREG_SPACING,
+                                       "sb1250-duart")) {
+                       atomic_add(-1, &duart->map_guard);
+                       printk(err);
+                       ret = -EBUSY;
+               }
+       }
+       if (!ret) {
+               ret = sbd_map_port(uport);
+               if (ret) {
+                       map_guard = atomic_add_return(-1, &duart->map_guard);
+                       if (!map_guard)
+                               release_mem_region(duart->mapctrl,
+                                                  DUART_CHANREG_SPACING);
+               }
+       }
+       if (ret) {
+               release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
+               return ret;
+       }
+       return 0;
+}
+
+static void sbd_config_port(struct uart_port *uport, int flags)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       if (flags & UART_CONFIG_TYPE) {
+               if (sbd_request_port(uport))
+                       return;
+
+               uport->type = PORT_SB1250_DUART;
+
+               sbd_init_port(sport);
+       }
+}
+
+static int sbd_verify_port(struct uart_port *uport, struct serial_struct *ser)
+{
+       int ret = 0;
+
+       if (ser->type != PORT_UNKNOWN && ser->type != PORT_SB1250_DUART)
+               ret = -EINVAL;
+       if (ser->irq != uport->irq)
+               ret = -EINVAL;
+       if (ser->baud_base != uport->uartclk / 16)
+               ret = -EINVAL;
+       return ret;
+}
+
+
+static struct uart_ops sbd_ops = {
+       .tx_empty       = sbd_tx_empty,
+       .set_mctrl      = sbd_set_mctrl,
+       .get_mctrl      = sbd_get_mctrl,
+       .stop_tx        = sbd_stop_tx,
+       .start_tx       = sbd_start_tx,
+       .stop_rx        = sbd_stop_rx,
+       .enable_ms      = sbd_enable_ms,
+       .break_ctl      = sbd_break_ctl,
+       .startup        = sbd_startup,
+       .shutdown       = sbd_shutdown,
+       .set_termios    = sbd_set_termios,
+       .type           = sbd_type,
+       .release_port   = sbd_release_port,
+       .request_port   = sbd_request_port,
+       .config_port    = sbd_config_port,
+       .verify_port    = sbd_verify_port,
+};
+
+/* Initialize SB1250 DUART port structures.  */
+static void __init sbd_probe_duarts(void)
+{
+       static int probed;
+       int chip, side;
+       int max_lines, line;
+
+       if (probed)
+               return;
+
+       /* Set the number of available units based on the SOC type.  */
+       switch (soc_type) {
+       case K_SYS_SOC_TYPE_BCM1x55:
+       case K_SYS_SOC_TYPE_BCM1x80:
+               max_lines = 4;
+               break;
+       default:
+               /* Assume at least two serial ports at the normal address.  */
+               max_lines = 2;
+               break;
+       }
+
+       probed = 1;
+
+       for (chip = 0, line = 0; chip < DUART_MAX_CHIP && line < max_lines;
+            chip++) {
+               sbd_duarts[chip].mapctrl = SBD_CTRLREGS(line);
+
+               for (side = 0; side < DUART_MAX_SIDE && line < max_lines;
+                    side++, line++) {
+                       struct sbd_port *sport = &sbd_duarts[chip].sport[side];
+                       struct uart_port *uport = &sport->port;
+
+                       sport->duart    = &sbd_duarts[chip];
+
+                       uport->irq      = SBD_INT(line);
+                       uport->uartclk  = 100000000 / 20 * 16;
+                       uport->fifosize = 16;
+                       uport->iotype   = UPIO_MEM;
+                       uport->flags    = UPF_BOOT_AUTOCONF;
+                       uport->ops      = &sbd_ops;
+                       uport->line     = line;
+                       uport->mapbase  = SBD_CHANREGS(line);
+               }
+       }
+}
+
+
+#ifdef CONFIG_SERIAL_SB1250_DUART_CONSOLE
+/*
+ * Serial console stuff.  Very basic, polling driver for doing serial
+ * console output.  The console_sem is held by the caller, so we
+ * shouldn't be interrupted for more console activity.
+ */
+static void sbd_console_putchar(struct uart_port *uport, int ch)
+{
+       struct sbd_port *sport = to_sport(uport);
+
+       sbd_transmit_drain(sport);
+       write_sbdchn(sport, R_DUART_TX_HOLD, ch);
+}
+
+static void sbd_console_write(struct console *co, const char *s,
+                             unsigned int count)
+{
+       int chip = co->index / DUART_MAX_SIDE;
+       int side = co->index % DUART_MAX_SIDE;
+       struct sbd_port *sport = &sbd_duarts[chip].sport[side];
+       struct uart_port *uport = &sport->port;
+       unsigned long flags;
+       unsigned int mask;
+
+       /* Disable transmit interrupts and enable the transmitter. */
+       spin_lock_irqsave(&uport->lock, flags);
+       mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
+       write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
+                    mask & ~M_DUART_IMR_TX);
+       write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN);
+       spin_unlock_irqrestore(&uport->lock, flags);
+
+       uart_console_write(&sport->port, s, count, sbd_console_putchar);
+
+       /* Restore transmit interrupts and the transmitter enable. */
+       spin_lock_irqsave(&uport->lock, flags);
+       sbd_line_drain(sport);
+       if (sport->tx_stopped)
+               write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS);
+       write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
+       spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+static int __init sbd_console_setup(struct console *co, char *options)
+{
+       int chip = co->index / DUART_MAX_SIDE;
+       int side = co->index % DUART_MAX_SIDE;
+       struct sbd_port *sport = &sbd_duarts[chip].sport[side];
+       struct uart_port *uport = &sport->port;
+       int baud = 115200;
+       int bits = 8;
+       int parity = 'n';
+       int flow = 'n';
+       int ret;
+
+       if (!sport->duart)
+               return -ENXIO;
+
+       ret = sbd_map_port(uport);
+       if (ret)
+               return ret;
+
+       sbd_init_port(sport);
+
+       if (options)
+               uart_parse_options(options, &baud, &parity, &bits, &flow);
+       return uart_set_options(uport, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver sbd_reg;
+static struct console sbd_console = {
+       .name   = "duart",
+       .write  = sbd_console_write,
+       .device = uart_console_device,
+       .setup  = sbd_console_setup,
+       .flags  = CON_PRINTBUFFER,
+       .index  = -1,
+       .data   = &sbd_reg
+};
+
+static int __init sbd_serial_console_init(void)
+{
+       sbd_probe_duarts();
+       register_console(&sbd_console);
+
+       return 0;
+}
+
+console_initcall(sbd_serial_console_init);
+
+#define SERIAL_SB1250_DUART_CONSOLE    &sbd_console
+#else
+#define SERIAL_SB1250_DUART_CONSOLE    NULL
+#endif /* CONFIG_SERIAL_SB1250_DUART_CONSOLE */
+
+
+static struct uart_driver sbd_reg = {
+       .owner          = THIS_MODULE,
+       .driver_name    = "serial",
+       .dev_name       = "duart",
+       .major          = TTY_MAJOR,
+       .minor          = SB1250_DUART_MINOR_BASE,
+       .nr             = DUART_MAX_CHIP * DUART_MAX_SIDE,
+       .cons           = SERIAL_SB1250_DUART_CONSOLE,
+};
+
+/* Set up the driver and register it.  */
+static int __init sbd_init(void)
+{
+       int i, ret;
+
+       sbd_probe_duarts();
+
+       ret = uart_register_driver(&sbd_reg);
+       if (ret)
+               return ret;
+
+       for (i = 0; i < DUART_MAX_CHIP * DUART_MAX_SIDE; i++) {
+               struct sbd_duart *duart = &sbd_duarts[i / DUART_MAX_SIDE];
+               struct sbd_port *sport = &duart->sport[i % DUART_MAX_SIDE];
+               struct uart_port *uport = &sport->port;
+
+               if (sport->duart)
+                       uart_add_one_port(&sbd_reg, uport);
+       }
+
+       return 0;
+}
+
+/* Unload the driver.  Unregister stuff, get ready to go away.  */
+static void __exit sbd_exit(void)
+{
+       int i;
+
+       for (i = DUART_MAX_CHIP * DUART_MAX_SIDE - 1; i >= 0; i--) {
+               struct sbd_duart *duart = &sbd_duarts[i / DUART_MAX_SIDE];
+               struct sbd_port *sport = &duart->sport[i % DUART_MAX_SIDE];
+               struct uart_port *uport = &sport->port;
+
+               if (sport->duart)
+                       uart_remove_one_port(&sbd_reg, uport);
+       }
+
+       uart_unregister_driver(&sbd_reg);
+}
+
+module_init(sbd_init);
+module_exit(sbd_exit);
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/include/asm-mips/sibyte/bcm1480_regs.h 
linux-2.6.22-20070712/include/asm-mips/sibyte/bcm1480_regs.h
--- linux-2.6.22-20070712.macro/include/asm-mips/sibyte/bcm1480_regs.h  
2007-07-12 02:55:37.000000000 +0000
+++ linux-2.6.22-20070712/include/asm-mips/sibyte/bcm1480_regs.h        
2007-07-12 14:26:21.000000000 +0000
@@ -220,17 +220,25 @@
 #define A_BCM1480_DUART(chan)               ((((chan)&2) == 0)? 
A_BCM1480_DUART0 : A_BCM1480_DUART1)
 
 #define BCM1480_DUART_CHANREG_SPACING       0x100
-#define A_BCM1480_DUART_CHANREG(chan,reg)   (A_BCM1480_DUART(chan) \
-                                     + 
BCM1480_DUART_CHANREG_SPACING*((chan)&1) \
-                                     + (reg))
-#define R_BCM1480_DUART_CHANREG(chan,reg)   
(BCM1480_DUART_CHANREG_SPACING*((chan)&1) + (reg))
-
-#define R_BCM1480_DUART_IMRREG(chan)       (R_DUART_IMR_A + 
((chan)&1)*DUART_IMRISR_SPACING)
-#define R_BCM1480_DUART_ISRREG(chan)       (R_DUART_ISR_A + 
((chan)&1)*DUART_IMRISR_SPACING)
-
-#define A_BCM1480_DUART_IMRREG(chan)       (A_BCM1480_DUART(chan) + 
R_BCM1480_DUART_IMRREG(chan))
-#define A_BCM1480_DUART_ISRREG(chan)       (A_BCM1480_DUART(chan) + 
R_BCM1480_DUART_ISRREG(chan))
-#define A_BCM1480_DUART_IN_PORT(chan)       (A_BCM1480_DUART(chan) + 
R_DUART_INP_ORT)
+#define A_BCM1480_DUART_CHANREG(chan, reg)                             \
+       (A_BCM1480_DUART(chan) +                                        \
+        BCM1480_DUART_CHANREG_SPACING * (((chan) & 1) + 1) + (reg))
+#define A_BCM1480_DUART_CTRLREG(chan, reg)                             \
+       (A_BCM1480_DUART(chan) +                                        \
+        BCM1480_DUART_CHANREG_SPACING * 3 + (reg))
+
+#define R_BCM1480_DUART_IMRREG(chan)                                   \
+       (R_DUART_IMR_A + ((chan) & 1) * DUART_IMRISR_SPACING)
+#define R_BCM1480_DUART_ISRREG(chan)                                   \
+       (R_DUART_ISR_A + ((chan) & 1) * DUART_IMRISR_SPACING)
+
+#define A_BCM1480_DUART_IMRREG(chan)                                   \
+       (A_BCM1480_DUART_CTRLREG((chan), R_BCM1480_DUART_IMRREG(chan)))
+#define A_BCM1480_DUART_ISRREG(chan)                                   \
+       (A_BCM1480_DUART_CTRLREG((chan), R_BCM1480_DUART_ISRREG(chan)))
+
+#define A_BCM1480_DUART_IN_PORT(chan)                                  \
+       (A_BCM1480_DUART_CTRLREG((chan), R_DUART_IN_PORT))
 
 /*
  * These constants are the absolute addresses.
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/include/asm-mips/sibyte/sb1250_regs.h 
linux-2.6.22-20070712/include/asm-mips/sibyte/sb1250_regs.h
--- linux-2.6.22-20070712.macro/include/asm-mips/sibyte/sb1250_regs.h   
2007-07-12 02:55:37.000000000 +0000
+++ linux-2.6.22-20070712/include/asm-mips/sibyte/sb1250_regs.h 2007-07-12 
14:26:21.000000000 +0000
@@ -272,59 +272,69 @@
     ********************************************************************* */
 
 
-#if SIBYTE_HDR_FEATURE_1250_112x               /* This MC only on 1250 & 112x 
*/
+#if SIBYTE_HDR_FEATURE_1250_112x    /* This MC only on 1250 & 112x */
 #define R_DUART_NUM_PORTS           2
 
 #define A_DUART                     0x0010060000
 
 #define DUART_CHANREG_SPACING       0x100
-#define A_DUART_CHANREG(chan,reg)   (A_DUART + DUART_CHANREG_SPACING*(chan) + 
(reg))
-#define R_DUART_CHANREG(chan,reg)   (DUART_CHANREG_SPACING*(chan) + (reg))
+
+#define A_DUART_CHANREG(chan, reg)                                     \
+       (A_DUART + DUART_CHANREG_SPACING * ((chan) + 1) + (reg))
 #endif /* 1250 & 112x */
 
-#define R_DUART_MODE_REG_1         0x100
-#define R_DUART_MODE_REG_2         0x110
-#define R_DUART_STATUS              0x120
-#define R_DUART_CLK_SEL             0x130
-#define R_DUART_CMD                 0x150
-#define R_DUART_RX_HOLD             0x160
-#define R_DUART_TX_HOLD             0x170
+#define R_DUART_MODE_REG_1         0x000
+#define R_DUART_MODE_REG_2         0x010
+#define R_DUART_STATUS             0x020
+#define R_DUART_CLK_SEL                    0x030
+#define R_DUART_CMD                0x050
+#define R_DUART_RX_HOLD                    0x060
+#define R_DUART_TX_HOLD                    0x070
 
 #if SIBYTE_HDR_FEATURE(1250, PASS2) || SIBYTE_HDR_FEATURE(112x, PASS1) || 
SIBYTE_HDR_FEATURE_CHIP(1480)
-#define R_DUART_FULL_CTL           0x140
-#define R_DUART_OPCR_X             0x180
-#define R_DUART_AUXCTL_X           0x190
-#endif /* 1250 PASS2 || 112x PASS1 || 1480*/
+#define R_DUART_FULL_CTL           0x040
+#define R_DUART_OPCR_X             0x080
+#define R_DUART_AUXCTL_X           0x090
+#endif /* 1250 PASS2 || 112x PASS1 || 1480 */
 
 
 /*
  * The IMR and ISR can't be addressed with A_DUART_CHANREG,
- * so use this macro instead.
+ * so use these macros instead.
  */
 
-#define R_DUART_AUX_CTRL            0x310
-#define R_DUART_ISR_A               0x320
-#define R_DUART_IMR_A               0x330
-#define R_DUART_ISR_B               0x340
-#define R_DUART_IMR_B               0x350
-#define R_DUART_OUT_PORT            0x360
-#define R_DUART_OPCR                0x370
-#define R_DUART_IN_PORT             0x380
-
-#define R_DUART_SET_OPR                    0x3B0
-#define R_DUART_CLEAR_OPR          0x3C0
-
-#define DUART_IMRISR_SPACING        0x20
-
-#if SIBYTE_HDR_FEATURE_1250_112x               /* This MC only on 1250 & 112x 
*/
-#define R_DUART_IMRREG(chan)       (R_DUART_IMR_A + 
(chan)*DUART_IMRISR_SPACING)
-#define R_DUART_ISRREG(chan)       (R_DUART_ISR_A + 
(chan)*DUART_IMRISR_SPACING)
-
-#define A_DUART_IMRREG(chan)       (A_DUART + R_DUART_IMRREG(chan))
-#define A_DUART_ISRREG(chan)       (A_DUART + R_DUART_ISRREG(chan))
+#if SIBYTE_HDR_FEATURE_1250_112x    /* This MC only on 1250 & 112x */
+#define DUART_IMRISR_SPACING       0x20
+#define DUART_INCHNG_SPACING       0x10
+
+#define A_DUART_CTRLREG(reg)                                           \
+       (A_DUART + DUART_CHANREG_SPACING * 3 + (reg))
+
+#define R_DUART_IMRREG(chan)                                           \
+       (R_DUART_IMR_A + (chan) * DUART_IMRISR_SPACING)
+#define R_DUART_ISRREG(chan)                                           \
+       (R_DUART_ISR_A + (chan) * DUART_IMRISR_SPACING)
+#define R_DUART_INCHREG(chan)                                          \
+       (R_DUART_IN_CHNG_A + (chan) * DUART_INCHNG_SPACING)
+
+#define A_DUART_IMRREG(chan)       A_DUART_CTRLREG(R_DUART_IMRREG(chan))
+#define A_DUART_ISRREG(chan)       A_DUART_CTRLREG(R_DUART_ISRREG(chan))
+#define A_DUART_INCHREG(chan)      A_DUART_CTRLREG(R_DUART_INCHREG(chan))
 #endif /* 1250 & 112x */
 
-
+#define R_DUART_AUX_CTRL           0x010
+#define R_DUART_ISR_A              0x020
+#define R_DUART_IMR_A              0x030
+#define R_DUART_ISR_B              0x040
+#define R_DUART_IMR_B              0x050
+#define R_DUART_OUT_PORT           0x060
+#define R_DUART_OPCR               0x070
+#define R_DUART_IN_PORT                    0x080
+
+#define R_DUART_SET_OPR                    0x0B0
+#define R_DUART_CLEAR_OPR          0x0C0
+#define R_DUART_IN_CHNG_A          0x0D0
+#define R_DUART_IN_CHNG_B          0x0E0
 
 
 /*
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/include/asm-mips/sibyte/sb1250_uart.h 
linux-2.6.22-20070712/include/asm-mips/sibyte/sb1250_uart.h
--- linux-2.6.22-20070712.macro/include/asm-mips/sibyte/sb1250_uart.h   
2007-07-12 02:55:37.000000000 +0000
+++ linux-2.6.22-20070712/include/asm-mips/sibyte/sb1250_uart.h 2007-07-12 
14:26:21.000000000 +0000
@@ -75,7 +75,8 @@
 #define V_DUART_PARITY_MODE_ADD_FIXED 
V_DUART_PARITY_MODE(K_DUART_PARITY_MODE_ADD_FIXED)
 #define V_DUART_PARITY_MODE_NONE      
V_DUART_PARITY_MODE(K_DUART_PARITY_MODE_NONE)
 
-#define M_DUART_ERR_MODE            _SB_MAKEMASK1(5)    /* must be zero */
+#define M_DUART_TX_IRQ_SEL_TXRDY    0
+#define M_DUART_TX_IRQ_SEL_TXEMPT   _SB_MAKEMASK1(5)
 
 #define M_DUART_RX_IRQ_SEL_RXRDY    0
 #define M_DUART_RX_IRQ_SEL_RXFULL   _SB_MAKEMASK1(6)
@@ -246,10 +247,13 @@
 
 #define M_DUART_ISR_BRK_A           _SB_MAKEMASK1(2)
 #define M_DUART_ISR_IN_A            _SB_MAKEMASK1(3)
+#define M_DUART_ISR_ALL_A          _SB_MAKEMASK(4,0)
+
 #define M_DUART_ISR_TX_B            _SB_MAKEMASK1(4)
 #define M_DUART_ISR_RX_B            _SB_MAKEMASK1(5)
 #define M_DUART_ISR_BRK_B           _SB_MAKEMASK1(6)
 #define M_DUART_ISR_IN_B            _SB_MAKEMASK1(7)
+#define M_DUART_ISR_ALL_B          _SB_MAKEMASK(4,4)
 
 /*
  * DUART Channel A Interrupt Status Register (Table 10-17)
@@ -262,6 +266,7 @@
 #define M_DUART_ISR_RX              _SB_MAKEMASK1(1)
 #define M_DUART_ISR_BRK             _SB_MAKEMASK1(2)
 #define M_DUART_ISR_IN              _SB_MAKEMASK1(3)
+#define M_DUART_ISR_ALL                    _SB_MAKEMASK(4,0)
 #define M_DUART_ISR_RESERVED        _SB_MAKEMASK(4,4)
 
 /*
diff -up --recursive --new-file 
linux-2.6.22-20070712.macro/include/linux/serial_core.h 
linux-2.6.22-20070712/include/linux/serial_core.h
--- linux-2.6.22-20070712.macro/include/linux/serial_core.h     2007-07-12 
02:55:45.000000000 +0000
+++ linux-2.6.22-20070712/include/linux/serial_core.h   2007-07-12 
14:30:44.000000000 +0000
@@ -142,6 +142,9 @@
 /* Micrel KS8695 */
 #define PORT_KS8695    76
 
+/* Broadcom SB1250, etc. SOC */
+#define PORT_SB1250_DUART      77
+
 
 #ifdef __KERNEL__
 

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