2 * Copyright (C) 2003 PMC-Sierra Inc.
3 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
13 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
14 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
15 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
16 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
17 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
18 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
19 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 675 Mass Ave, Cambridge, MA 02139, USA.
25 * Second level Interrupt handlers for the PMC-Sierra Titan/Yosemite board
27 #include <linux/config.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/kernel_stat.h>
31 #include <linux/module.h>
32 #include <linux/signal.h>
33 #include <linux/sched.h>
34 #include <linux/types.h>
35 #include <linux/interrupt.h>
36 #include <linux/ioport.h>
37 #include <linux/irq.h>
38 #include <linux/timex.h>
39 #include <linux/slab.h>
40 #include <linux/random.h>
41 #include <linux/bitops.h>
42 #include <asm/bootinfo.h>
45 #include <asm/irq_cpu.h>
46 #include <asm/mipsregs.h>
47 #include <asm/system.h>
48 #include <asm/titan_dep.h>
50 /* Hypertransport specific */
51 #define IRQ_ACK_BITS 0x00000000 /* Ack bits */
53 #define HYPERTRANSPORT_INTA 0x78 /* INTA# */
54 #define HYPERTRANSPORT_INTB 0x79 /* INTB# */
55 #define HYPERTRANSPORT_INTC 0x7a /* INTC# */
56 #define HYPERTRANSPORT_INTD 0x7b /* INTD# */
58 extern asmlinkage void titan_handle_int(void);
59 extern void jaguar_mailbox_irq(struct pt_regs *);
62 * Handle hypertransport & SMP interrupts. The interrupt lines are scarce.
63 * For interprocessor interrupts, the best thing to do is to use the INTMSG
64 * register. We use the same external interrupt line, i.e. INTB3 and monitor
67 asmlinkage void ll_ht_smp_irq_handler(int irq, struct pt_regs *regs)
69 u32 status = OCD_READ(RM9000x2_OCD_INTP0STATUS4);
71 /* Ack all the bits that correspond to the interrupt sources */
73 OCD_WRITE(RM9000x2_OCD_INTP0STATUS4, IRQ_ACK_BITS);
75 status = OCD_READ(RM9000x2_OCD_INTP1STATUS4);
77 OCD_WRITE(RM9000x2_OCD_INTP1STATUS4, IRQ_ACK_BITS);
79 #ifdef CONFIG_HT_LEVEL_TRIGGER
81 * Level Trigger Mode only. Send the HT EOI message back to the source.
85 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTA);
88 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTB);
91 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTC);
94 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTD);
98 OCD_WRITE(RM9000x2_OCD_HTEOI, 0x20);
99 OCD_WRITE(IRQ_CLEAR_REG, IRQ_ACK_BITS);
102 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTA);
103 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTB);
104 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTC);
105 OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTD);
108 #endif /* CONFIG_HT_LEVEL_TRIGGER */
113 asmlinkage void do_extended_irq(struct pt_regs *regs)
115 unsigned int intcontrol = read_c0_intcontrol();
116 unsigned int cause = read_c0_cause();
117 unsigned int status = read_c0_status();
118 unsigned int pending_sr, pending_ic;
120 pending_sr = status & cause & 0xff00;
121 pending_ic = (cause >> 8) & intcontrol & 0xff00;
123 if (pending_ic & (1 << 13))
129 extern void init_second_port(void);
133 * Initialize the next level interrupt handler
135 void __init arch_init_irq(void)
137 clear_c0_status(ST0_IM);
139 set_except_vector(0, titan_handle_int);
140 mips_cpu_irq_init(0);
141 rm7k_cpu_irq_init(8);
142 rm9k_cpu_irq_init(12);
145 /* At this point, initialize the second serial port */
149 #ifdef CONFIG_GDB_CONSOLE
150 register_gdb_console();
156 * The 16550 DUART has two ports, but is allocated one IRQ
157 * for the serial console. Hence, a generic framework for
158 * serial IRQ routing in place. Currently, just calls the
159 * do_IRQ fuction. But, going in the future, need to check
160 * DUART registers for channel A and B, then decide the
163 asmlinkage void yosemite_kgdb_irq(int irq, struct pt_regs *regs)