Pull video into test branch
[linux-drm-fsl-dcu.git] / arch / powerpc / platforms / ps3 / smp.c
1 /*
2  *  PS3 SMP routines.
3  *
4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
5  *  Copyright 2006 Sony Corp.
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; version 2 of the License.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/smp.h>
23
24 #include <asm/machdep.h>
25 #include <asm/udbg.h>
26 #include <asm/ps3.h>
27
28 #include "platform.h"
29
30 #if defined(DEBUG)
31 #define DBG(fmt...) udbg_printf(fmt)
32 #else
33 #define DBG(fmt...) do{if(0)printk(fmt);}while(0)
34 #endif
35
36 static irqreturn_t ipi_function_handler(int irq, void *msg)
37 {
38         smp_message_recv((int)(long)msg);
39         return IRQ_HANDLED;
40 }
41
42 /**
43   * virqs - a per cpu array of virqs for ipi use
44   */
45
46 #define MSG_COUNT 4
47 static DEFINE_PER_CPU(unsigned int, virqs[MSG_COUNT]);
48
49 static const char *names[MSG_COUNT] = {
50         "ipi call",
51         "ipi reschedule",
52         "ipi migrate",
53         "ipi debug brk"
54 };
55
56 static void do_message_pass(int target, int msg)
57 {
58         int result;
59         unsigned int virq;
60
61         if (msg >= MSG_COUNT) {
62                 DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
63                 return;
64         }
65
66         virq = per_cpu(virqs, target)[msg];
67         result = ps3_send_event_locally(virq);
68
69         if (result)
70                 DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
71                         " (%d)\n", __func__, __LINE__, target, msg, result);
72 }
73
74 static void ps3_smp_message_pass(int target, int msg)
75 {
76         int cpu;
77
78         if (target < NR_CPUS)
79                 do_message_pass(target, msg);
80         else if (target == MSG_ALL_BUT_SELF) {
81                 for_each_online_cpu(cpu)
82                         if (cpu != smp_processor_id())
83                                 do_message_pass(cpu, msg);
84         } else {
85                 for_each_online_cpu(cpu)
86                         do_message_pass(cpu, msg);
87         }
88 }
89
90 static int ps3_smp_probe(void)
91 {
92         return 2;
93 }
94
95 static void __init ps3_smp_setup_cpu(int cpu)
96 {
97         int result;
98         unsigned int *virqs = per_cpu(virqs, cpu);
99         int i;
100
101         DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
102
103         /*
104          * Check assumptions on virqs[] indexing. If this
105          * check fails, then a different mapping of PPC_MSG_
106          * to index needs to be setup.
107          */
108
109         BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION  != 0);
110         BUILD_BUG_ON(PPC_MSG_RESCHEDULE     != 1);
111         BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
112
113         for (i = 0; i < MSG_COUNT; i++) {
114                 result = ps3_alloc_event_irq(&virqs[i]);
115
116                 if (result)
117                         continue;
118
119                 DBG("%s:%d: (%d, %d) => virq %u\n",
120                         __func__, __LINE__, cpu, i, virqs[i]);
121
122
123                 request_irq(virqs[i], ipi_function_handler, IRQF_DISABLED,
124                         names[i], (void*)(long)i);
125         }
126
127         ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
128
129         DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
130 }
131
132 void ps3_smp_cleanup_cpu(int cpu)
133 {
134         unsigned int *virqs = per_cpu(virqs, cpu);
135         int i;
136
137         DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
138         for (i = 0; i < MSG_COUNT; i++) {
139                 ps3_free_event_irq(virqs[i]);
140                 free_irq(virqs[i], (void*)(long)i);
141                 virqs[i] = NO_IRQ;
142         }
143         DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
144 }
145
146 static struct smp_ops_t ps3_smp_ops = {
147         .probe          = ps3_smp_probe,
148         .message_pass   = ps3_smp_message_pass,
149         .kick_cpu       = smp_generic_kick_cpu,
150         .setup_cpu      = ps3_smp_setup_cpu,
151 };
152
153 void smp_init_ps3(void)
154 {
155         DBG(" -> %s\n", __func__);
156         smp_ops = &ps3_smp_ops;
157         DBG(" <- %s\n", __func__);
158 }