1 /*
2 * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
3 * Copyright (C) 2001 Ralf Baechle
4 * Copyright (C) 2010 PMC-Sierra, Inc.
5 *
6 * VSMP support for MSP platforms . Derived from malta vsmp support.
7 *
8 * This program is free software; you can distribute it and/or modify it
9 * under the terms of the GNU General Public License (Version 2) as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
20 *
21 */
22 #include <linux/smp.h>
23 #include <linux/interrupt.h>
24
25 #ifdef CONFIG_MIPS_MT_SMP
26 #define MIPS_CPU_IPI_RESCHED_IRQ 0 /* SW int 0 for resched */
27 #define MIPS_CPU_IPI_CALL_IRQ 1 /* SW int 1 for call */
28
29
ipi_resched_dispatch(void)30 static void ipi_resched_dispatch(void)
31 {
32 do_IRQ(MIPS_CPU_IPI_RESCHED_IRQ);
33 }
34
ipi_call_dispatch(void)35 static void ipi_call_dispatch(void)
36 {
37 do_IRQ(MIPS_CPU_IPI_CALL_IRQ);
38 }
39
ipi_resched_interrupt(int irq,void * dev_id)40 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
41 {
42 return IRQ_HANDLED;
43 }
44
ipi_call_interrupt(int irq,void * dev_id)45 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
46 {
47 generic_smp_call_function_interrupt();
48
49 return IRQ_HANDLED;
50 }
51
52 static struct irqaction irq_resched = {
53 .handler = ipi_resched_interrupt,
54 .flags = IRQF_PERCPU,
55 .name = "IPI_resched"
56 };
57
58 static struct irqaction irq_call = {
59 .handler = ipi_call_interrupt,
60 .flags = IRQF_PERCPU,
61 .name = "IPI_call"
62 };
63
arch_init_ipiirq(int irq,struct irqaction * action)64 void __init arch_init_ipiirq(int irq, struct irqaction *action)
65 {
66 setup_irq(irq, action);
67 irq_set_handler(irq, handle_percpu_irq);
68 }
69
msp_vsmp_int_init(void)70 void __init msp_vsmp_int_init(void)
71 {
72 set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
73 set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
74 arch_init_ipiirq(MIPS_CPU_IPI_RESCHED_IRQ, &irq_resched);
75 arch_init_ipiirq(MIPS_CPU_IPI_CALL_IRQ, &irq_call);
76 }
77 #endif /* CONFIG_MIPS_MT_SMP */
78