patch-2.4.22 linux-2.4.22/arch/mips/tx4927/common/tx4927_irq.c

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diff -urN linux-2.4.21/arch/mips/tx4927/common/tx4927_irq.c linux-2.4.22/arch/mips/tx4927/common/tx4927_irq.c
@@ -0,0 +1,708 @@
+/*
+ * Common tx4927 irq handler
+ *
+ * Author: MontaVista Software, Inc.
+ *         source@mvista.com
+ *
+ *  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.
+ */
+#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/tx4927/tx4927.h>
+
+/*
+ * DEBUG
+ */
+#define TX4927_IRQ_CHECK_CP0
+#define TX4927_IRQ_CHECK_PIC
+
+#undef TX4927_IRQ_DEBUG
+
+#ifdef TX4927_IRQ_DEBUG
+#define TX4927_IRQ_NONE        0x00000000
+
+#define TX4927_IRQ_INFO        ( 1 <<  0 )
+#define TX4927_IRQ_WARN        ( 1 <<  1 )
+#define TX4927_IRQ_EROR        ( 1 <<  2 )
+
+#define TX4927_IRQ_INIT        ( 1 <<  5 )
+#define TX4927_IRQ_NEST1       ( 1 <<  6 )
+#define TX4927_IRQ_NEST2       ( 1 <<  7 )
+#define TX4927_IRQ_NEST3       ( 1 <<  8 )
+#define TX4927_IRQ_NEST4       ( 1 <<  9 )
+
+#define TX4927_IRQ_CP0_INIT     ( 1 << 10 )
+#define TX4927_IRQ_CP0_STARTUP  ( 1 << 11 )
+#define TX4927_IRQ_CP0_SHUTDOWN ( 1 << 12 )
+#define TX4927_IRQ_CP0_ENABLE   ( 1 << 13 )
+#define TX4927_IRQ_CP0_DISABLE  ( 1 << 14 )
+#define TX4927_IRQ_CP0_MASK     ( 1 << 15 )
+#define TX4927_IRQ_CP0_ENDIRQ   ( 1 << 16 )
+
+#define TX4927_IRQ_PIC_INIT     ( 1 << 20 )
+#define TX4927_IRQ_PIC_STARTUP  ( 1 << 21 )
+#define TX4927_IRQ_PIC_SHUTDOWN ( 1 << 22 )
+#define TX4927_IRQ_PIC_ENABLE   ( 1 << 23 )
+#define TX4927_IRQ_PIC_DISABLE  ( 1 << 24 )
+#define TX4927_IRQ_PIC_MASK     ( 1 << 25 )
+#define TX4927_IRQ_PIC_ENDIRQ   ( 1 << 26 )
+
+#define TX4927_IRQ_ALL         0xffffffff
+#endif
+
+#ifdef TX4927_IRQ_DEBUG
+static const u32 tx4927_irq_debug_flag = (TX4927_IRQ_NONE
+					  | TX4927_IRQ_INFO
+					  | TX4927_IRQ_WARN | TX4927_IRQ_EROR
+//                                       | TX4927_IRQ_CP0_INIT
+//                                       | TX4927_IRQ_CP0_STARTUP
+//                                       | TX4927_IRQ_CP0_SHUTDOWN
+//                                       | TX4927_IRQ_CP0_ENABLE
+//                                       | TX4927_IRQ_CP0_DISABLE
+//                                       | TX4927_IRQ_CP0_MASK
+//                                       | TX4927_IRQ_CP0_ENDIRQ
+//                                       | TX4927_IRQ_PIC_INIT
+//                                       | TX4927_IRQ_PIC_STARTUP
+//                                       | TX4927_IRQ_PIC_SHUTDOWN
+//                                       | TX4927_IRQ_PIC_ENABLE
+//                                       | TX4927_IRQ_PIC_DISABLE
+//                                       | TX4927_IRQ_PIC_MASK
+//                                       | TX4927_IRQ_PIC_ENDIRQ
+//                                       | TX4927_IRQ_INIT
+//                                       | TX4927_IRQ_NEST1
+//                                       | TX4927_IRQ_NEST2
+//                                       | TX4927_IRQ_NEST3
+//                                       | TX4927_IRQ_NEST4
+    );
+#endif
+
+#ifdef TX4927_IRQ_DEBUG
+#define TX4927_IRQ_DPRINTK(flag,str...) \
+        if ( (tx4927_irq_debug_flag) & (flag) ) \
+        { \
+           char tmp[100]; \
+           sprintf( tmp, str ); \
+           printk( "%s(%s:%u)::%s", __FUNCTION__, __FILE__, __LINE__, tmp ); \
+        }
+#else
+#define TX4927_IRQ_DPRINTK(flag,str...)
+#endif
+
+/*
+ * Forwad definitions for all pic's
+ */
+
+static unsigned int tx4927_irq_cp0_startup(unsigned int irq);
+static void tx4927_irq_cp0_shutdown(unsigned int irq);
+static void tx4927_irq_cp0_enable(unsigned int irq);
+static void tx4927_irq_cp0_disable(unsigned int irq);
+static void tx4927_irq_cp0_mask_and_ack(unsigned int irq);
+static void tx4927_irq_cp0_end(unsigned int irq);
+
+static unsigned int tx4927_irq_pic_startup(unsigned int irq);
+static void tx4927_irq_pic_shutdown(unsigned int irq);
+static void tx4927_irq_pic_enable(unsigned int irq);
+static void tx4927_irq_pic_disable(unsigned int irq);
+static void tx4927_irq_pic_mask_and_ack(unsigned int irq);
+static void tx4927_irq_pic_end(unsigned int irq);
+
+/*
+ * Kernel structs for all pic's
+ */
+
+static spinlock_t tx4927_cp0_lock = SPIN_LOCK_UNLOCKED;
+static spinlock_t tx4927_pic_lock = SPIN_LOCK_UNLOCKED;
+
+#define TX4927_CP0_NAME "TX4927-CP0"
+static struct hw_interrupt_type tx4927_irq_cp0_type = {
+	typename:	TX4927_CP0_NAME,
+	startup:	tx4927_irq_cp0_startup,
+	shutdown:	tx4927_irq_cp0_shutdown,
+	enable:		tx4927_irq_cp0_enable,
+	disable:	tx4927_irq_cp0_disable,
+	ack:		tx4927_irq_cp0_mask_and_ack,
+	end:		tx4927_irq_cp0_end,
+	set_affinity:	NULL
+};
+
+#define TX4927_PIC_NAME "TX4927-PIC"
+static struct hw_interrupt_type tx4927_irq_pic_type = {
+	typename:	TX4927_PIC_NAME,
+	startup:	tx4927_irq_pic_startup,
+	shutdown:	tx4927_irq_pic_shutdown,
+	enable:		tx4927_irq_pic_enable,
+	disable:	tx4927_irq_pic_disable,
+	ack:		tx4927_irq_pic_mask_and_ack,
+	end:		tx4927_irq_pic_end,
+	set_affinity:	NULL
+};
+
+#define TX4927_PIC_ACTION(s) { no_action, 0, 0, s, NULL, NULL }
+static struct irqaction tx4927_irq_pic_action =
+TX4927_PIC_ACTION(TX4927_PIC_NAME);
+
+#define CCP0_STATUS 12
+#define CCP0_CAUSE 13
+
+/*
+ * Functions for cp0
+ */
+
+#define tx4927_irq_cp0_mask(irq) ( 1 << ( irq-TX4927_IRQ_CP0_BEG+8 ) )
+
+static void tx4927_irq_cp0_modify(unsigned cp0_reg, unsigned clr_bits,
+	unsigned set_bits)
+{
+	unsigned long val = 0;
+
+	switch (cp0_reg) {
+	case CCP0_STATUS:
+		val = read_c0_status();
+		break;
+
+	case CCP0_CAUSE:
+		val = read_c0_cause();
+		break;
+
+	}
+
+	val &= (~clr_bits);
+	val |= (set_bits);
+
+	switch (cp0_reg) {
+	case CCP0_STATUS:{
+			write_c0_status(val);
+			break;
+		}
+	case CCP0_CAUSE:{
+			write_c0_cause(val);
+			break;
+		}
+	}
+
+	return;
+}
+
+static void __init tx4927_irq_cp0_init(void)
+{
+	int i;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_INIT, "beg=%d end=%d\n",
+			   TX4927_IRQ_CP0_BEG, TX4927_IRQ_CP0_END);
+
+	for (i = TX4927_IRQ_CP0_BEG; i <= TX4927_IRQ_CP0_END; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 1;
+		irq_desc[i].handler = &tx4927_irq_cp0_type;
+	}
+
+	return;
+}
+
+static unsigned int tx4927_irq_cp0_startup(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_STARTUP, "irq=%d \n", irq);
+
+#ifdef TX4927_IRQ_CHECK_CP0
+	{
+		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	tx4927_irq_cp0_enable(irq);
+
+	return (0);
+}
+
+static void tx4927_irq_cp0_shutdown(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_SHUTDOWN, "irq=%d \n", irq);
+
+#ifdef TX4927_IRQ_CHECK_CP0
+	{
+		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	tx4927_irq_cp0_disable(irq);
+
+	return;
+}
+
+static void tx4927_irq_cp0_enable(unsigned int irq)
+{
+	unsigned long flags;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENABLE, "irq=%d \n", irq);
+
+#ifdef TX4927_IRQ_CHECK_CP0
+	{
+		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	spin_lock_irqsave(&tx4927_cp0_lock, flags);
+
+	tx4927_irq_cp0_modify(CCP0_STATUS, 0, tx4927_irq_cp0_mask(irq));
+
+	spin_unlock_irqrestore(&tx4927_cp0_lock, flags);
+
+	return;
+}
+
+static void tx4927_irq_cp0_disable(unsigned int irq)
+{
+	unsigned long flags;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_DISABLE, "irq=%d \n", irq);
+
+#ifdef TX4927_IRQ_CHECK_CP0
+	{
+		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	spin_lock_irqsave(&tx4927_cp0_lock, flags);
+
+	tx4927_irq_cp0_modify(CCP0_STATUS, tx4927_irq_cp0_mask(irq), 0);
+
+	spin_unlock_irqrestore(&tx4927_cp0_lock, flags);
+
+	return;
+}
+
+static void tx4927_irq_cp0_mask_and_ack(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_MASK, "irq=%d \n", irq);
+
+#ifdef TX4927_IRQ_CHECK_CP0
+	{
+		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	tx4927_irq_cp0_disable(irq);
+
+	return;
+}
+
+static void tx4927_irq_cp0_end(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENDIRQ, "irq=%d \n", irq);
+
+#ifdef TX4927_IRQ_CHECK_CP0
+	{
+		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+		tx4927_irq_cp0_enable(irq);
+	}
+
+	return;
+}
+
+/*
+ * Functions for pic
+ */
+
+u32 tx4927_irq_pic_addr(int irq)
+{
+	/* MVMCP -- need to formulize this */
+	irq -= TX4927_IRQ_PIC_BEG;
+	switch (irq) {
+	case 17:
+	case 16:
+	case 1:
+	case 0:
+		return (0xff1ff610);
+
+	case 19:
+	case 18:
+	case 3:
+	case 2:
+		return (0xff1ff614);
+
+	case 21:
+	case 20:
+	case 5:
+	case 4:
+		return (0xff1ff618);
+
+	case 23:
+	case 22:
+	case 7:
+	case 6:
+		return (0xff1ff61c);
+
+	case 25:
+	case 24:
+	case 9:
+	case 8:
+		return (0xff1ff620);
+
+	case 27:
+	case 26:
+	case 11:
+	case 10:
+		return (0xff1ff624);
+
+	case 29:
+	case 28:
+	case 13:
+	case 12:
+		return (0xff1ff628);
+
+	case 31:
+	case 30:
+	case 15:
+	case 14:
+		return (0xff1ff62c);
+
+	}
+	return (0);
+}
+
+u32 tx4927_irq_pic_mask(int irq)
+{
+	/* MVMCP -- need to formulize this */
+	irq -= TX4927_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 tx4927_irq_pic_modify(unsigned pic_reg, unsigned clr_bits,
+	unsigned set_bits)
+{
+	unsigned long val = 0;
+
+	val = TX4927_RD(pic_reg);
+	val &= (~clr_bits);
+	val |= (set_bits);
+	TX4927_WR(pic_reg, val);
+
+	return;
+}
+
+static void __init tx4927_irq_pic_init(void)
+{
+	unsigned long flags;
+	int i;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_INIT, "beg=%d end=%d\n",
+			   TX4927_IRQ_PIC_BEG, TX4927_IRQ_PIC_END);
+
+	for (i = TX4927_IRQ_PIC_BEG; i <= TX4927_IRQ_PIC_END; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 2;
+		irq_desc[i].handler = &tx4927_irq_pic_type;
+	}
+
+	setup_irq(TX4927_IRQ_NEST_PIC_ON_CP0, &tx4927_irq_pic_action);
+
+	spin_lock_irqsave(&tx4927_pic_lock, flags);
+
+	TX4927_WR(0xff1ff640, 0x6);	/* irq level mask -- only accept hightest */
+	TX4927_WR(0xff1ff600, TX4927_RD(0xff1ff600) | 0x1);	/* irq enable */
+
+	spin_unlock_irqrestore(&tx4927_pic_lock, flags);
+
+	return;
+}
+
+static unsigned int tx4927_irq_pic_startup(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_STARTUP, "irq=%d\n", irq);
+
+#ifdef TX4927_IRQ_CHECK_PIC
+	{
+		if (irq < TX4927_IRQ_PIC_BEG || irq > TX4927_IRQ_PIC_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	tx4927_irq_pic_enable(irq);
+
+	return (0);
+}
+
+static void tx4927_irq_pic_shutdown(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_SHUTDOWN, "irq=%d\n", irq);
+
+#ifdef TX4927_IRQ_CHECK_PIC
+	{
+		if (irq < TX4927_IRQ_PIC_BEG || irq > TX4927_IRQ_PIC_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	tx4927_irq_pic_disable(irq);
+
+	return;
+}
+
+static void tx4927_irq_pic_enable(unsigned int irq)
+{
+	unsigned long flags;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_ENABLE, "irq=%d\n", irq);
+
+#ifdef TX4927_IRQ_CHECK_PIC
+	{
+		if (irq < TX4927_IRQ_PIC_BEG || irq > TX4927_IRQ_PIC_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	spin_lock_irqsave(&tx4927_pic_lock, flags);
+
+	tx4927_irq_pic_modify(tx4927_irq_pic_addr(irq), 0,
+			      tx4927_irq_pic_mask(irq));
+
+	spin_unlock_irqrestore(&tx4927_pic_lock, flags);
+
+	return;
+}
+
+static void tx4927_irq_pic_disable(unsigned int irq)
+{
+	unsigned long flags;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_DISABLE, "irq=%d\n", irq);
+
+#ifdef TX4927_IRQ_CHECK_PIC
+	{
+		if (irq < TX4927_IRQ_PIC_BEG || irq > TX4927_IRQ_PIC_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	spin_lock_irqsave(&tx4927_pic_lock, flags);
+
+	tx4927_irq_pic_modify(tx4927_irq_pic_addr(irq),
+			      tx4927_irq_pic_mask(irq), 0);
+
+	spin_unlock_irqrestore(&tx4927_pic_lock, flags);
+
+	return;
+}
+
+static void tx4927_irq_pic_mask_and_ack(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_MASK, "irq=%d\n", irq);
+
+#ifdef TX4927_IRQ_CHECK_PIC
+	{
+		if (irq < TX4927_IRQ_PIC_BEG || irq > TX4927_IRQ_PIC_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	tx4927_irq_pic_disable(irq);
+
+	return;
+}
+
+static void tx4927_irq_pic_end(unsigned int irq)
+{
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_ENDIRQ, "irq=%d\n", irq);
+
+#ifdef TX4927_IRQ_CHECK_PIC
+	{
+		if (irq < TX4927_IRQ_PIC_BEG || irq > TX4927_IRQ_PIC_END) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
+					   "bad irq=%d \n", irq);
+			panic("\n");
+		}
+	}
+#endif
+
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+		tx4927_irq_pic_enable(irq);
+	}
+
+	return;
+}
+
+/*
+ * Main init functions
+ */
+void __init tx4927_irq_init(void)
+{
+	extern asmlinkage void tx4927_irq_handler(void);
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "-\n");
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_cp0_init()\n");
+	tx4927_irq_cp0_init();
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_pic_init()\n");
+	tx4927_irq_pic_init();
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT,
+			   "=Calling set_except_vector(tx4927_irq_handler)\n");
+	set_except_vector(0, tx4927_irq_handler);
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "+\n");
+
+	return;
+}
+
+int tx4927_irq_nested(void)
+{
+	int sw_irq = 0;
+	u32 level2;
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST1, "-\n");
+
+	level2 = TX4927_RD(0xff1ff6a0);
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST2, "=level2a=0x%x\n", level2);
+
+	if ((level2 & 0x10000) == 0) {
+		level2 &= 0x1f;
+		TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST3, "=level2b=0x%x\n", level2);
+
+		sw_irq = TX4927_IRQ_PIC_BEG + level2;
+		TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST3, "=sw_irq=%d\n", sw_irq);
+
+		if (sw_irq == 27) {
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST4, "=irq-%d\n",
+					   sw_irq);
+
+#ifdef CONFIG_TOSHIBA_RBTX4927
+			{
+				extern int toshiba_rbtx4927_irq_nested(int sw_irq);
+
+				sw_irq = toshiba_rbtx4927_irq_nested(sw_irq);
+			}
+#endif
+
+			TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST4, "=irq+%d\n",
+					   sw_irq);
+		}
+	}
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST2, "=sw_irq=%d\n", sw_irq);
+
+	TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST1, "+\n");
+
+	return (sw_irq);
+}

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)