Support for Toshiba's RBHMA4500 eval board for the TX4938.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

24 files changed, 4118 insertions, 0 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 338c21f3efd..1f53fe8a89f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -695,6 +695,24 @@ config SOC_AU1500
 config SOC_AU1550
 	bool "SOC_AU1550"
 
+config TOSHIBA_RBTX4938
+	bool "Support for Toshiba RBTX4938 board"
+	select HAVE_STD_PC_SERIAL_PORT
+	select DMA_NONCOHERENT
+	select GENERIC_ISA_DMA
+	select HAS_TXX9_SERIAL
+	select HW_HAS_PCI
+	select I8259
+	select ISA
+	select SWAP_IO_SPACE
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_BIG_ENDIAN
+	select TOSHIBA_BOARDS
+	help
+	  This Toshiba board is based on the TX4938 processor. Say Y here to
+	  support this machine type
+
 endchoice
 
 choice
@@ -837,6 +855,7 @@ config TOSHIBA_FPCIB0
 
 source "arch/mips/sgi-ip27/Kconfig"
 source "arch/mips/sibyte/Kconfig"
+source "arch/mips/tx4938/Kconfig"
 source "arch/mips/philips/pnx8550/common/Kconfig"
 
 config RWSEM_GENERIC_SPINLOCK
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 9c91e70d8ee..3dc2fb81fb2 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -690,6 +690,13 @@ core-$(CONFIG_TOSHIBA_RBTX4927)	+= arch/mips/tx4927/toshiba_rbtx4927/
 core-$(CONFIG_TOSHIBA_RBTX4927)	+= arch/mips/tx4927/common/
 load-$(CONFIG_TOSHIBA_RBTX4927)	+= 0xffffffff80020000
 
+#
+# Toshiba RBTX4938 board
+#
+core-$(CONFIG_TOSHIBA_RBTX4938) += arch/mips/tx4938/toshiba_rbtx4938/
+core-$(CONFIG_TOSHIBA_RBTX4938) += arch/mips/tx4938/common/
+load-$(CONFIG_TOSHIBA_RBTX4938) += 0xffffffff80100000
+
 cflags-y			+= -Iinclude/asm-mips/mach-generic
 drivers-$(CONFIG_PCI)		+= arch/mips/pci/
 
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index ea8438b81fe..6956de95a7e 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -52,5 +52,6 @@ obj-$(CONFIG_TANBAC_TB0226)	+= fixup-tb0226.o
 obj-$(CONFIG_TANBAC_TB0287)	+= fixup-tb0287.o
 obj-$(CONFIG_TOSHIBA_JMR3927)	+= fixup-jmr3927.o pci-jmr3927.o
 obj-$(CONFIG_TOSHIBA_RBTX4927)	+= fixup-rbtx4927.o ops-tx4927.o
+obj-$(CONFIG_TOSHIBA_RBTX4938)	+= fixup-tx4938.o ops-tx4938.o
 obj-$(CONFIG_VICTOR_MPC30X)	+= fixup-mpc30x.o
 obj-$(CONFIG_ZAO_CAPCELLA)	+= fixup-capcella.o
diff --git a/arch/mips/pci/fixup-tx4938.c b/arch/mips/pci/fixup-tx4938.c
new file mode 100644
index 00000000000..f455520ada8
--- /dev/null
+++ b/arch/mips/pci/fixup-tx4938.c
@@ -0,0 +1,92 @@
+/*
+ * Toshiba rbtx4938 pci routines
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/tx4938/rbtx4938.h>
+
+extern struct pci_controller tx4938_pci_controller[];
+
+int pci_get_irq(struct pci_dev *dev, int pin)
+{
+	int irq = pin;
+	u8 slot = PCI_SLOT(dev->devfn);
+	struct pci_controller *controller = (struct pci_controller *)dev->sysdata;
+
+	if (controller == &tx4938_pci_controller[1]) {
+		/* TX4938 PCIC1 */
+		switch (slot) {
+		case TX4938_PCIC_IDSEL_AD_TO_SLOT(31):
+			if (tx4938_ccfgptr->pcfg & TX4938_PCFG_ETH0_SEL)
+				return RBTX4938_IRQ_IRC + TX4938_IR_ETH0;
+			break;
+		case TX4938_PCIC_IDSEL_AD_TO_SLOT(30):
+			if (tx4938_ccfgptr->pcfg & TX4938_PCFG_ETH1_SEL)
+				return RBTX4938_IRQ_IRC + TX4938_IR_ETH1;
+			break;
+		}
+		return 0;
+	}
+
+	/* IRQ rotation */
+	irq--;	/* 0-3 */
+	if (dev->bus->parent == NULL &&
+	    (slot == TX4938_PCIC_IDSEL_AD_TO_SLOT(23))) {
+		/* PCI CardSlot (IDSEL=A23) */
+		/* PCIA => PCIA (IDSEL=A23) */
+		irq = (irq + 0 + slot) % 4;
+	} else {
+		/* PCI Backplane */
+		irq = (irq + 33 - slot) % 4;
+	}
+	irq++;	/* 1-4 */
+
+	switch (irq) {
+	case 1:
+		irq = RBTX4938_IRQ_IOC_PCIA;
+		break;
+	case 2:
+		irq = RBTX4938_IRQ_IOC_PCIB;
+		break;
+	case 3:
+		irq = RBTX4938_IRQ_IOC_PCIC;
+		break;
+	case 4:
+		irq = RBTX4938_IRQ_IOC_PCID;
+		break;
+	}
+	return irq;
+}
+
+int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+	unsigned char irq = 0;
+
+	irq = pci_get_irq(dev, pin);
+
+	printk(KERN_INFO "PCI: 0x%02x:0x%02x(0x%02x,0x%02x) IRQ=%d\n",
+	       dev->bus->number, dev->devfn, PCI_SLOT(dev->devfn),
+	       PCI_FUNC(dev->devfn), irq);
+
+	return irq;
+}
+
+/*
+ * Do platform specific device initialization at pci_enable_device() time
+ */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+	return 0;
+}
+
diff --git a/arch/mips/pci/ops-tx4938.c b/arch/mips/pci/ops-tx4938.c
new file mode 100644
index 00000000000..4c0dcfce529
--- /dev/null
+++ b/arch/mips/pci/ops-tx4938.c
@@ -0,0 +1,198 @@
+/*
+ * Define the pci_ops for the Toshiba rbtx4938
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/addrspace.h>
+#include <asm/tx4938/rbtx4938.h>
+
+/* initialize in setup */
+struct resource pci_io_resource = {
+	.name	= "pci IO space",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_IO
+};
+
+/* initialize in setup */
+struct resource pci_mem_resource = {
+	.name	= "pci memory space",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_MEM
+};
+
+struct resource tx4938_pcic1_pci_io_resource = {
+       	.name	= "PCI1 IO",
+       	.start	= 0,
+       	.end	= 0,
+       	.flags	= IORESOURCE_IO
+};
+struct resource tx4938_pcic1_pci_mem_resource = {
+       	.name	= "PCI1 mem",
+       	.start	= 0,
+       	.end	= 0,
+       	.flags	= IORESOURCE_MEM
+};
+
+static int mkaddr(int bus, int dev_fn, int where, int *flagsp)
+{
+	if (bus > 0) {
+		/* Type 1 configuration */
+		tx4938_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) |
+		    ((dev_fn & 0xff) << 0x08) | (where & 0xfc) | 1;
+	} else {
+		if (dev_fn >= PCI_DEVFN(TX4938_PCIC_MAX_DEVNU, 0))
+			return -1;
+
+		/* Type 0 configuration */
+		tx4938_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) |
+		    ((dev_fn & 0xff) << 0x08) | (where & 0xfc);
+	}
+	/* clear M_ABORT and Disable M_ABORT Int. */
+	tx4938_pcicptr->pcistatus =
+	    (tx4938_pcicptr->pcistatus & 0x0000ffff) |
+	    (PCI_STATUS_REC_MASTER_ABORT << 16);
+	tx4938_pcicptr->pcimask &= ~PCI_STATUS_REC_MASTER_ABORT;
+
+	return 0;
+}
+
+static int check_abort(int flags)
+{
+	int code = PCIBIOS_SUCCESSFUL;
+	/* wait write cycle completion before checking error status */
+	while (tx4938_pcicptr->pcicstatus & TX4938_PCIC_PCICSTATUS_IWB)
+				;
+	if (tx4938_pcicptr->pcistatus & (PCI_STATUS_REC_MASTER_ABORT << 16)) {
+		tx4938_pcicptr->pcistatus =
+		    (tx4938_pcicptr->
+		     pcistatus & 0x0000ffff) | (PCI_STATUS_REC_MASTER_ABORT
+						<< 16);
+		tx4938_pcicptr->pcimask |= PCI_STATUS_REC_MASTER_ABORT;
+		code = PCIBIOS_DEVICE_NOT_FOUND;
+	}
+	return code;
+}
+
+static int tx4938_pcibios_read_config(struct pci_bus *bus, unsigned int devfn,
+					int where, int size, u32 * val)
+{
+	int flags, retval, dev, busno, func;
+
+	dev = PCI_SLOT(devfn);
+	func = PCI_FUNC(devfn);
+
+	/* check if the bus is top-level */
+	if (bus->parent != NULL)
+		busno = bus->number;
+	else {
+		busno = 0;
+	}
+
+	if (mkaddr(busno, devfn, where, &flags))
+		return -1;
+
+	switch (size) {
+	case 1:
+		*val = *(volatile u8 *) ((ulong) & tx4938_pcicptr->g2pcfgdata |
+#ifdef __BIG_ENDIAN
+			      ((where & 3) ^ 3));
+#else
+			      (where & 3));
+#endif
+		break;
+	case 2:
+		*val = *(volatile u16 *) ((ulong) & tx4938_pcicptr->g2pcfgdata |
+#ifdef __BIG_ENDIAN
+				((where & 3) ^ 2));
+#else
+				(where & 3));
+#endif
+		break;
+	case 4:
+		*val = tx4938_pcicptr->g2pcfgdata;
+		break;
+	}
+
+	retval = check_abort(flags);
+	if (retval == PCIBIOS_DEVICE_NOT_FOUND)
+		*val = 0xffffffff;
+
+	return retval;
+}
+
+static int tx4938_pcibios_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+						int size, u32 val)
+{
+	int flags, dev, busno, func;
+
+	busno = bus->number;
+	dev = PCI_SLOT(devfn);
+	func = PCI_FUNC(devfn);
+
+	/* check if the bus is top-level */
+	if (bus->parent != NULL) {
+		busno = bus->number;
+	} else {
+		busno = 0;
+	}
+
+	if (mkaddr(busno, devfn, where, &flags))
+		return -1;
+
+	switch (size) {
+	case 1:
+		*(volatile u8 *) ((ulong) & tx4938_pcicptr->g2pcfgdata |
+#ifdef __BIG_ENDIAN
+			  ((where & 3) ^ 3)) = val;
+#else
+			  (where & 3)) = val;
+#endif
+		break;
+	case 2:
+		*(volatile u16 *) ((ulong) & tx4938_pcicptr->g2pcfgdata |
+#ifdef __BIG_ENDIAN
+			((where & 0x3) ^ 0x2)) = val;
+#else
+			(where & 3)) = val;
+#endif
+		break;
+	case 4:
+		tx4938_pcicptr->g2pcfgdata = val;
+		break;
+	}
+
+	return check_abort(flags);
+}
+
+struct pci_ops tx4938_pci_ops = {
+	tx4938_pcibios_read_config,
+	tx4938_pcibios_write_config
+};
+
+struct pci_controller tx4938_pci_controller[] = {
+	/* h/w only supports devices 0x00 to 0x14 */
+	{
+		.pci_ops        = &tx4938_pci_ops,
+		.io_resource    = &pci_io_resource,
+		.mem_resource   = &pci_mem_resource,
+	},
+	/* h/w only supports devices 0x00 to 0x14 */
+	{
+		.pci_ops        = &tx4938_pci_ops,
+		.io_resource    = &tx4938_pcic1_pci_io_resource,
+		.mem_resource   = &tx4938_pcic1_pci_mem_resource,
+        }
+};
diff --git a/arch/mips/tx4938/Kconfig b/arch/mips/tx4938/Kconfig
new file mode 100644
index 00000000000..d90e9cd8513
--- /dev/null
+++ b/arch/mips/tx4938/Kconfig
@@ -0,0 +1,24 @@
+if TOSHIBA_RBTX4938
+
+comment "Multiplex Pin Select"
+choice
+	prompt "PIO[58:61]"
+	default TOSHIBA_RBTX4938_MPLEX_PIO58_61
+
+config TOSHIBA_RBTX4938_MPLEX_PIO58_61
+	bool "PIO"
+config TOSHIBA_RBTX4938_MPLEX_NAND
+	bool "NAND"
+config TOSHIBA_RBTX4938_MPLEX_ATA
+	bool "ATA"
+
+endchoice
+
+config TX4938_NAND_BOOT
+	depends on EXPERIMENTAL && TOSHIBA_RBTX4938_MPLEX_NAND
+	bool "NAND Boot Support (EXPERIMENTAL)"
+	help
+	  This is only for Toshiba RBTX4938 reference board, which has NAND IPL.
+	  Select this option if you need to use NAND boot.
+
+endif
diff --git a/arch/mips/tx4938/common/Makefile b/arch/mips/tx4938/common/Makefile
new file mode 100644
index 00000000000..74c95c5bcdb
--- /dev/null
+++ b/arch/mips/tx4938/common/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for common code for Toshiba TX4927 based systems
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+
+obj-y	+= prom.o setup.o irq.o irq_handler.o rtc_rx5c348.o
+obj-$(CONFIG_KGDB) += dbgio.o
+
diff --git a/arch/mips/tx4938/common/dbgio.c b/arch/mips/tx4938/common/dbgio.c
new file mode 100644
index 00000000000..bea59ff1842
--- /dev/null
+++ b/arch/mips/tx4938/common/dbgio.c
@@ -0,0 +1,50 @@
+/*
+ * linux/arch/mips/tx4938/common/dbgio.c
+ *
+ * kgdb interface for gdb
+ *
+ * Author: MontaVista Software, Inc.
+ *         source@mvista.com
+ *
+ * Copyright 2005 MontaVista Software Inc.
+ *
+ *  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.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Support for TX4938 in 2.6 - Hiroshi DOYU <Hiroshi_DOYU@montavista.co.jp>
+ */
+
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/tx4938/tx4938_mips.h>
+
+extern u8 txx9_sio_kdbg_rd(void);
+extern int txx9_sio_kdbg_wr( u8 ch );
+
+u8 getDebugChar(void)
+{
+	return (txx9_sio_kdbg_rd());
+}
+
+int putDebugChar(u8 byte)
+{
+	return (txx9_sio_kdbg_wr(byte));
+}
+
diff --git a/arch/mips/tx4938/common/irq.c b/arch/mips/tx4938/common/irq.c
new file mode 100644
index 00000000000..4f90d7faf63
--- /dev/null
+++ b/arch/mips/tx4938/common/irq.c
@@ -0,0 +1,424 @@
+/*
+ * linux/arch/mps/tx4938/common/irq.c
+ *
+ * Common tx4938 irq handler
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/irq.h>
+#include <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/tx4938/rbtx4938.h>
+
+/**********************************************************************************/
+/* Forwad definitions for all pic's                                               */
+/**********************************************************************************/
+
+static unsigned int tx4938_irq_cp0_startup(unsigned int irq);
+static void tx4938_irq_cp0_shutdown(unsigned int irq);
+static void tx4938_irq_cp0_enable(unsigned int irq);
+static void tx4938_irq_cp0_disable(unsigned int irq);
+static void tx4938_irq_cp0_mask_and_ack(unsigned int irq);
+static void tx4938_irq_cp0_end(unsigned int irq);
+
+static unsigned int tx4938_irq_pic_startup(unsigned int irq);
+static void tx4938_irq_pic_shutdown(unsigned int irq);
+static void tx4938_irq_pic_enable(unsigned int irq);
+static void tx4938_irq_pic_disable(unsigned int irq);
+static void tx4938_irq_pic_mask_and_ack(unsigned int irq);
+static void tx4938_irq_pic_end(unsigned int irq);
+
+/**********************************************************************************/
+/* Kernel structs for all pic's                                                   */
+/**********************************************************************************/
+DEFINE_SPINLOCK(tx4938_cp0_lock);
+DEFINE_SPINLOCK(tx4938_pic_lock);
+
+#define TX4938_CP0_NAME "TX4938-CP0"
+static struct hw_interrupt_type tx4938_irq_cp0_type = {
+	.typename = TX4938_CP0_NAME,
+	.startup = tx4938_irq_cp0_startup,
+	.shutdown = tx4938_irq_cp0_shutdown,
+	.enable = tx4938_irq_cp0_enable,
+	.disable = tx4938_irq_cp0_disable,
+	.ack = tx4938_irq_cp0_mask_and_ack,
+	.end = tx4938_irq_cp0_end,
+	.set_affinity = NULL
+};
+
+#define TX4938_PIC_NAME "TX4938-PIC"
+static struct hw_interrupt_type tx4938_irq_pic_type = {
+	.typename = TX4938_PIC_NAME,
+	.startup = tx4938_irq_pic_startup,
+	.shutdown = tx4938_irq_pic_shutdown,
+	.enable = tx4938_irq_pic_enable,
+	.disable = tx4938_irq_pic_disable,
+	.ack = tx4938_irq_pic_mask_and_ack,
+	.end = tx4938_irq_pic_end,
+	.set_affinity = NULL
+};
+
+static struct irqaction tx4938_irq_pic_action = {
+	.handler = no_action,
+	.flags = 0,
+	.mask = CPU_MASK_NONE,
+	.name = TX4938_PIC_NAME
+};
+
+/**********************************************************************************/
+/* Functions for cp0                                                              */
+/**********************************************************************************/
+
+#define tx4938_irq_cp0_mask(irq) ( 1 << ( irq-TX4938_IRQ_CP0_BEG+8 ) )
+
+static void __init
+tx4938_irq_cp0_init(void)
+{
+	int i;
+
+	for (i = TX4938_IRQ_CP0_BEG; i <= TX4938_IRQ_CP0_END; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 1;
+		irq_desc[i].handler = &tx4938_irq_cp0_type;
+	}
+
+	return;
+}
+
+static unsigned int
+tx4938_irq_cp0_startup(unsigned int irq)
+{
+	tx4938_irq_cp0_enable(irq);
+
+	return (0);
+}
+
+static void
+tx4938_irq_cp0_shutdown(unsigned int irq)
+{
+	tx4938_irq_cp0_disable(irq);
+}
+
+static void
+tx4938_irq_cp0_enable(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&tx4938_cp0_lock, flags);
+
+	set_c0_status(tx4938_irq_cp0_mask(irq));
+
+	spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
+}
+
+static void
+tx4938_irq_cp0_disable(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&tx4938_cp0_lock, flags);
+
+	clear_c0_status(tx4938_irq_cp0_mask(irq));
+
+	spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
+
+	return;
+}
+
+static void
+tx4938_irq_cp0_mask_and_ack(unsigned int irq)
+{
+	tx4938_irq_cp0_disable(irq);
+
+	return;
+}
+
+static void
+tx4938_irq_cp0_end(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+		tx4938_irq_cp0_enable(irq);
+	}
+
+	return;
+}
+
+/**********************************************************************************/
+/* Functions for pic                                                              */
+/**********************************************************************************/
+
+u32
+tx4938_irq_pic_addr(int irq)
+{
+	/* MVMCP -- need to formulize this */
+	irq -= TX4938_IRQ_PIC_BEG;
+
+	switch (irq) {
+	case 17:
+	case 16:
+	case 1:
+	case 0:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL0));
+		}
+	case 19:
+	case 18:
+	case 3:
+	case 2:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL1));
+		}
+	case 21:
+	case 20:
+	case 5:
+	case 4:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL2));
+		}
+	case 23:
+	case 22:
+	case 7:
+	case 6:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL3));
+		}
+	case 25:
+	case 24:
+	case 9:
+	case 8:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL4));
+		}
+	case 27:
+	case 26:
+	case 11:
+	case 10:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL5));
+		}
+	case 29:
+	case 28:
+	case 13:
+	case 12:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL6));
+		}
+	case 31:
+	case 30:
+	case 15:
+	case 14:{
+			return (TX4938_MKA(TX4938_IRC_IRLVL7));
+		}
+	}
+
+	return (0);
+}
+
+u32
+tx4938_irq_pic_mask(int irq)
+{
+	/* MVMCP -- need to formulize this */
+	irq -= TX4938_IRQ_PIC_BEG;
+
+	switch (irq) {
+	case 31:
+	case 29:
+	case 27:
+	case 25:
+	case 23:
+	case 21:
+	case 19:
+	case 17:{
+			return (0x07000000);
+		}
+	case 30:
+	case 28:
+	case 26:
+	case 24:
+	case 22:
+	case 20:
+	case 18:
+	case 16:{
+			return (0x00070000);
+		}
+	case 15:
+	case 13:
+	case 11:
+	case 9:
+	case 7:
+	case 5:
+	case 3:
+	case 1:{
+			return (0x00000700);
+		}
+	case 14:
+	case 12:
+	case 10:
+	case 8:
+	case 6:
+	case 4:
+	case 2:
+	case 0:{
+			return (0x00000007);
+		}
+	}
+	return (0x00000000);
+}
+
+static void
+tx4938_irq_pic_modify(unsigned pic_reg, unsigned clr_bits, unsigned set_bits)
+{
+	unsigned long val = 0;
+
+	val = TX4938_RD(pic_reg);
+	val &= (~clr_bits);
+	val |= (set_bits);
+	TX4938_WR(pic_reg, val);
+	mmiowb();
+	TX4938_RD(pic_reg);
+
+	return;
+}
+
+static void __init
+tx4938_irq_pic_init(void)
+{
+	unsigned long flags;
+	int i;
+
+	for (i = TX4938_IRQ_PIC_BEG; i <= TX4938_IRQ_PIC_END; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 2;
+		irq_desc[i].handler = &tx4938_irq_pic_type;
+	}
+
+	setup_irq(TX4938_IRQ_NEST_PIC_ON_CP0, &tx4938_irq_pic_action);
+
+	spin_lock_irqsave(&tx4938_pic_lock, flags);
+
+	TX4938_WR(0xff1ff640, 0x6);	/* irq level mask -- only accept hightest */
+	TX4938_WR(0xff1ff600, TX4938_RD(0xff1ff600) | 0x1);	/* irq enable */
+
+	spin_unlock_irqrestore(&tx4938_pic_lock, flags);
+
+	return;
+}
+
+static unsigned int
+tx4938_irq_pic_startup(unsigned int irq)
+{
+	tx4938_irq_pic_enable(irq);
+
+	return (0);
+}
+
+static void
+tx4938_irq_pic_shutdown(unsigned int irq)
+{
+	tx4938_irq_pic_disable(irq);
+
+	return;
+}
+
+static void
+tx4938_irq_pic_enable(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&tx4938_pic_lock, flags);
+
+	tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq), 0,
+			      tx4938_irq_pic_mask(irq));
+
+	spin_unlock_irqrestore(&tx4938_pic_lock, flags);
+
+	return;
+}
+
+static void
+tx4938_irq_pic_disable(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&tx4938_pic_lock, flags);
+
+	tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq),
+			      tx4938_irq_pic_mask(irq), 0);
+
+	spin_unlock_irqrestore(&tx4938_pic_lock, flags);
+
+	return;
+}
+
+static void
+tx4938_irq_pic_mask_and_ack(unsigned int irq)
+{
+	tx4938_irq_pic_disable(irq);
+
+	return;
+}
+
+static void
+tx4938_irq_pic_end(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+		tx4938_irq_pic_enable(irq);
+	}
+
+	return;
+}
+
+/**********************************************************************************/
+/* Main init functions                                                            */
+/**********************************************************************************/
+
+void __init
+tx4938_irq_init(void)
+{
+	extern asmlinkage void tx4938_irq_handler(void);
+
+	tx4938_irq_cp0_init();
+	tx4938_irq_pic_init();
+	set_except_vector(0, tx4938_irq_handler);
+
+	return;
+}
+
+int
+tx4938_irq_nested(void)
+{
+	int sw_irq = 0;
+	u32 level2;
+
+	level2 = TX4938_RD(0xff1ff6a0);
+	if ((level2 & 0x10000) == 0) {
+		level2 &= 0x1f;
+		sw_irq = TX4938_IRQ_PIC_BEG + level2;
+		if (sw_irq == 26) {
+			{
+				extern int toshiba_rbtx4938_irq_nested(int sw_irq);
+				sw_irq = toshiba_rbtx4938_irq_nested(sw_irq);
+			}
+		}
+	}
+
+	wbflush();
+	return (sw_irq);
+}
diff --git a/arch/mips/tx4938/common/irq_handler.S b/arch/mips/tx4938/common/irq_handler.S
new file mode 100644
index 00000000000..1b2f72bac42
--- /dev/null
+++ b/arch/mips/tx4938/common/irq_handler.S
@@ -0,0 +1,84 @@
+/*
+ * linux/arch/mips/tx4938/common/handler.S
+ *
+ * Primary interrupt handler for tx4938 based systems
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/tx4938/rbtx4938.h>
+
+
+		.align	5
+		NESTED(tx4938_irq_handler, PT_SIZE, sp)
+		SAVE_ALL
+		CLI
+		.set	at
+
+		mfc0	t0, CP0_CAUSE
+		mfc0	t1, CP0_STATUS
+		and	t0, t1
+
+		andi	t1, t0, STATUSF_IP7	/* cpu timer */
+		bnez	t1, ll_ip7
+
+		/* IP6..IP3 multiplexed -- do not use */
+
+		andi	t1, t0, STATUSF_IP2	/* tx4938 pic */
+		bnez	t1, ll_ip2
+
+		andi	t1, t0, STATUSF_IP1	/* user line 1 */
+		bnez	t1, ll_ip1
+
+		andi	t1, t0, STATUSF_IP0	/* user line 0 */
+		bnez	t1, ll_ip0
+
+		.set	reorder
+
+		nop
+		END(tx4938_irq_handler)
+
+		.align	5
+
+
+ll_ip7:
+		li	a0, TX4938_IRQ_CPU_TIMER
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
+
+
+ll_ip2:
+		jal	tx4938_irq_nested
+		nop
+		beqz	v0, goto_spurious_interrupt
+		nop
+		move	a0, v0
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
+
+goto_spurious_interrupt:
+		j	ret_from_irq
+
+ll_ip1:
+		li	a0, TX4938_IRQ_USER1
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
+
+ll_ip0:
+		li	a0, TX4938_IRQ_USER0
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
diff --git a/arch/mips/tx4938/common/prom.c b/arch/mips/tx4938/common/prom.c
new file mode 100644
index 00000000000..3189a65f7d7
--- /dev/null
+++ b/arch/mips/tx4938/common/prom.c
@@ -0,0 +1,129 @@
+/*
+ * linux/arch/mips/tx4938/common/prom.c
+ *
+ * common tx4938 memory interface
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/bootmem.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/tx4938/tx4938.h>
+
+static unsigned int __init
+tx4938_process_sdccr(u64 * addr)
+{
+	u64 val;
+	unsigned int sdccr_ce;
+	unsigned int sdccr_rs;
+	unsigned int sdccr_cs;
+	unsigned int sdccr_mw;
+	unsigned int rs = 0;
+	unsigned int cs = 0;
+	unsigned int mw = 0;
+	unsigned int bc = 4;
+	unsigned int msize = 0;