2 * Copyright (C) 2003 PMC-Sierra Inc.
3 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
5 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
12 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
13 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
15 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
18 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
19 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 675 Mass Ave, Cambridge, MA 02139, USA.
27 * Second level Interrupt handlers for the PMC-Sierra Titan/Yosemite board
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/kernel_stat.h>
32 #include <linux/module.h>
33 #include <linux/signal.h>
34 #include <linux/sched.h>
35 #include <linux/types.h>
36 #include <linux/interrupt.h>
37 #include <linux/ioport.h>
38 #include <linux/irq.h>
39 #include <linux/timex.h>
40 #include <linux/slab.h>
41 #include <linux/random.h>
42 #include <linux/bitops.h>
43 #include <asm/bootinfo.h>
46 #include <asm/irq_cpu.h>
47 #include <asm/mipsregs.h>
48 #include <asm/system.h>
49 #include <asm/titan_dep.h>
51 /* Hypertransport specific */
52 #define IRQ_ACK_BITS 0x00000000 /* Ack bits */
54 #define HYPERTRANSPORT_INTA 0x78 /* INTA# */
55 #define HYPERTRANSPORT_INTB 0x79 /* INTB# */
56 #define HYPERTRANSPORT_INTC 0x7a /* INTC# */
57 #define HYPERTRANSPORT_INTD 0x7b /* INTD# */
59 extern void titan_mailbox_irq(void);
61 #ifdef CONFIG_HYPERTRANSPORT
63 * Handle hypertransport & SMP interrupts. The interrupt lines are scarce.
64 * For interprocessor interrupts, the best thing to do is to use the INTMSG
65 * register. We use the same external interrupt line, i.e. INTB3 and monitor
68 static void ll_ht_smp_irq_handler(int irq)
70 u32 status = OCD_READ(RM9000x2_OCD_INTP0STATUS4);
72 /* Ack all the bits that correspond to the interrupt sources */
74 OCD_WRITE(RM9000x2_OCD_INTP0STATUS4, IRQ_ACK_BITS);
76 status = OCD_READ(RM9000x2_OCD_INTP1STATUS4);
78 OCD_WRITE(RM9000x2_OCD_INTP1STATUS4, IRQ_ACK_BITS);
80 #ifdef CONFIG_HT_LEVEL_TRIGGER
82 * Level Trigger Mode only. Send the HT EOI message back to the source.
86 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTA);
89 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTB);
92 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTC);
95 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTD);
99 OCD_WRITE(RM9000x2_OCD_HTEOI, 0x20);
100 OCD_WRITE(IRQ_CLEAR_REG, IRQ_ACK_BITS);
103 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTA);
104 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTB);
105 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTC);
106 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTD);
109 #endif /* CONFIG_HT_LEVEL_TRIGGER */
115 asmlinkage void plat_irq_dispatch(void)
117 unsigned int cause = read_c0_cause();
118 unsigned int status = read_c0_status();
119 unsigned int pending = cause & status;
121 if (pending & STATUSF_IP7) {
123 } else if (pending & STATUSF_IP2) {
124 #ifdef CONFIG_HYPERTRANSPORT
125 ll_ht_smp_irq_handler(2);
129 } else if (pending & STATUSF_IP3) {
131 } else if (pending & STATUSF_IP4) {
133 } else if (pending & STATUSF_IP5) {
139 } else if (pending & STATUSF_IP6) {
145 * Initialize the next level interrupt handler
147 void __init arch_init_irq(void)
149 clear_c0_status(ST0_IM);
155 #ifdef CONFIG_GDB_CONSOLE
156 register_gdb_console();