1 /*
2 * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
3 *
4 * This program is free software; you can distribute it and/or modify it
5 * under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16 *
17 */
18 /*
19 * Simulator Platform-specific hooks for SMTC operation
20 */
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/cpumask.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp.h>
26
27 #include <linux/atomic.h>
28 #include <asm/cpu.h>
29 #include <asm/processor.h>
30 #include <asm/smtc.h>
31 #include <asm/mmu_context.h>
32 #include <asm/smtc_ipi.h>
33
34 /* VPE/SMP Prototype implements platform interfaces directly */
35
36 /*
37 * Cause the specified action to be performed on a targeted "CPU"
38 */
39
ssmtc_send_ipi_single(int cpu,unsigned int action)40 static void ssmtc_send_ipi_single(int cpu, unsigned int action)
41 {
42 smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
43 /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
44 }
45
ssmtc_send_ipi_mask(const struct cpumask * mask,unsigned int action)46 static inline void ssmtc_send_ipi_mask(const struct cpumask *mask,
47 unsigned int action)
48 {
49 unsigned int i;
50
51 for_each_cpu(i, mask)
52 ssmtc_send_ipi_single(i, action);
53 }
54
55 /*
56 * Post-config but pre-boot cleanup entry point
57 */
ssmtc_init_secondary(void)58 static void __cpuinit ssmtc_init_secondary(void)
59 {
60 smtc_init_secondary();
61 }
62
63 /*
64 * SMP initialization finalization entry point
65 */
ssmtc_smp_finish(void)66 static void __cpuinit ssmtc_smp_finish(void)
67 {
68 smtc_smp_finish();
69 }
70
71 /*
72 * Hook for after all CPUs are online
73 */
ssmtc_cpus_done(void)74 static void ssmtc_cpus_done(void)
75 {
76 }
77
78 /*
79 * Platform "CPU" startup hook
80 */
ssmtc_boot_secondary(int cpu,struct task_struct * idle)81 static void __cpuinit ssmtc_boot_secondary(int cpu, struct task_struct *idle)
82 {
83 smtc_boot_secondary(cpu, idle);
84 }
85
ssmtc_smp_setup(void)86 static void __init ssmtc_smp_setup(void)
87 {
88 if (read_c0_config3() & (1 << 2))
89 mipsmt_build_cpu_map(0);
90 }
91
92 /*
93 * Platform SMP pre-initialization
94 */
ssmtc_prepare_cpus(unsigned int max_cpus)95 static void ssmtc_prepare_cpus(unsigned int max_cpus)
96 {
97 /*
98 * As noted above, we can assume a single CPU for now
99 * but it may be multithreaded.
100 */
101
102 if (read_c0_config3() & (1 << 2)) {
103 mipsmt_prepare_cpus();
104 }
105 }
106
107 struct plat_smp_ops ssmtc_smp_ops = {
108 .send_ipi_single = ssmtc_send_ipi_single,
109 .send_ipi_mask = ssmtc_send_ipi_mask,
110 .init_secondary = ssmtc_init_secondary,
111 .smp_finish = ssmtc_smp_finish,
112 .cpus_done = ssmtc_cpus_done,
113 .boot_secondary = ssmtc_boot_secondary,
114 .smp_setup = ssmtc_smp_setup,
115 .prepare_cpus = ssmtc_prepare_cpus,
116 };
117