2 * Copyright (C) 2000 RidgeRun, Inc.
3 * Author: RidgeRun, Inc.
4 * glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com
6 * Copyright 2001 MontaVista Software Inc.
7 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
8 * Copyright (C) 2000, 2001 Ralf Baechle (ralf@gnu.org)
10 * Copyright 2004 PMC-Sierra
11 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
21 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
24 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
33 * Copyright (C) 2004 MontaVista Software Inc.
34 * Author: Manish Lachwani, mlachwani@mvista.com
37 #include <linux/errno.h>
38 #include <linux/init.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/module.h>
41 #include <linux/signal.h>
42 #include <linux/sched.h>
43 #include <linux/types.h>
44 #include <linux/interrupt.h>
45 #include <linux/ioport.h>
46 #include <linux/timex.h>
47 #include <linux/slab.h>
48 #include <linux/random.h>
49 #include <asm/bitops.h>
50 #include <asm/bootinfo.h>
53 #include <asm/mipsregs.h>
54 #include <asm/system.h>
56 static struct irqaction cascade_mv64340 = {
57 no_action, SA_INTERRUPT, CPU_MASK_NONE, "MV64340-Cascade", NULL, NULL
60 void __init arch_init_irq(void)
63 * Clear all of the interrupts while we change the able around a bit.
64 * int-handler is not on bootstrap
66 clear_c0_status(ST0_IM | ST0_BEV);
70 /* set up the cascading interrupts */
71 setup_irq(8, &cascade_mv64340); /* unmask intControl IM8, IRQ 9 */
74 set_c0_status(ST0_IM); /* IE in the status register */
78 asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
80 unsigned int pending = read_c0_cause() & read_c0_status();
82 if (pending & STATUSF_IP0)
84 else if (pending & STATUSF_IP1)
86 else if (pending & STATUSF_IP2)
88 else if (pending & STATUSF_IP3)
90 else if (pending & STATUSF_IP4)
92 else if (pending & STATUSF_IP5)
94 else if (pending & STATUSF_IP6)
96 else if (pending & STATUSF_IP7)
100 * Now look at the extended interrupts
102 pending = (read_c0_cause() & (read_c0_intcontrol() << 8)) >> 16;
104 if (pending & STATUSF_IP8)
105 ll_mv64340_irq(regs);
107 spurious_interrupt(regs);