Merge branch 'fixes' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur...
[pandora-kernel.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
27 #include "platform.h"
28
29 #if defined(DEBUG)
30 #define DBG udbg_printf
31 #else
32 #define DBG pr_debug
33 #endif
34
35 /**
36   * ps3_ipi_virqs - a per cpu array of virqs for ipi use
37   */
38
39 #define MSG_COUNT 4
40 static DEFINE_PER_CPU(unsigned int [MSG_COUNT], ps3_ipi_virqs);
41
42 static void ps3_smp_message_pass(int cpu, int msg)
43 {
44         int result;
45         unsigned int virq;
46
47         if (msg >= MSG_COUNT) {
48                 DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
49                 return;
50         }
51
52         virq = per_cpu(ps3_ipi_virqs, cpu)[msg];
53         result = ps3_send_event_locally(virq);
54
55         if (result)
56                 DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
57                         " (%d)\n", __func__, __LINE__, cpu, msg, result);
58 }
59
60 static int ps3_smp_probe(void)
61 {
62         int cpu;
63
64         for (cpu = 0; cpu < 2; cpu++) {
65                 int result;
66                 unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
67                 int i;
68
69                 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
70
71                 /*
72                 * Check assumptions on ps3_ipi_virqs[] indexing. If this
73                 * check fails, then a different mapping of PPC_MSG_
74                 * to index needs to be setup.
75                 */
76
77                 BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION    != 0);
78                 BUILD_BUG_ON(PPC_MSG_RESCHEDULE       != 1);
79                 BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
80                 BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK   != 3);
81
82                 for (i = 0; i < MSG_COUNT; i++) {
83                         result = ps3_event_receive_port_setup(cpu, &virqs[i]);
84
85                         if (result)
86                                 continue;
87
88                         DBG("%s:%d: (%d, %d) => virq %u\n",
89                                 __func__, __LINE__, cpu, i, virqs[i]);
90
91                         result = smp_request_message_ipi(virqs[i], i);
92
93                         if (result)
94                                 virqs[i] = NO_IRQ;
95                         else
96                                 ps3_register_ipi_irq(cpu, virqs[i]);
97                 }
98
99                 ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
100
101                 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
102         }
103
104         return 2;
105 }
106
107 void ps3_smp_cleanup_cpu(int cpu)
108 {
109         unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
110         int i;
111
112         DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
113
114         for (i = 0; i < MSG_COUNT; i++) {
115                 /* Can't call free_irq from interrupt context. */
116                 ps3_event_receive_port_destroy(virqs[i]);
117                 virqs[i] = NO_IRQ;
118         }
119
120         DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
121 }
122
123 static struct smp_ops_t ps3_smp_ops = {
124         .probe          = ps3_smp_probe,
125         .message_pass   = ps3_smp_message_pass,
126         .kick_cpu       = smp_generic_kick_cpu,
127 };
128
129 void smp_init_ps3(void)
130 {
131         DBG(" -> %s\n", __func__);
132         smp_ops = &ps3_smp_ops;
133         DBG(" <- %s\n", __func__);
134 }