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/system.h>
32 #include <asm/mmu_context.h>
33 #include <asm/smtc_ipi.h>
34
35 /* VPE/SMP Prototype implements platform interfaces directly */
36
37 /*
38 * Cause the specified action to be performed on a targeted "CPU"
39 */
40
ssmtc_send_ipi_single(int cpu,unsigned int action)41 static void ssmtc_send_ipi_single(int cpu, unsigned int action)
42 {
43 smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
44 /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
45 }
46
ssmtc_send_ipi_mask(const struct cpumask * mask,unsigned int action)47 static inline void ssmtc_send_ipi_mask(const struct cpumask *mask,
48 unsigned int action)
49 {
50 unsigned int i;
51
52 for_each_cpu(i, mask)
53 ssmtc_send_ipi_single(i, action);
54 }
55
56 /*
57 * Post-config but pre-boot cleanup entry point
58 */
ssmtc_init_secondary(void)59 static void __cpuinit ssmtc_init_secondary(void)
60 {
61 smtc_init_secondary();
62 }
63
64 /*
65 * SMP initialization finalization entry point
66 */
ssmtc_smp_finish(void)67 static void __cpuinit ssmtc_smp_finish(void)
68 {
69 smtc_smp_finish();
70 }
71
72 /*
73 * Hook for after all CPUs are online
74 */
ssmtc_cpus_done(void)75 static void ssmtc_cpus_done(void)
76 {
77 }
78
79 /*
80 * Platform "CPU" startup hook
81 */
ssmtc_boot_secondary(int cpu,struct task_struct * idle)82 static void __cpuinit ssmtc_boot_secondary(int cpu, struct task_struct *idle)
83 {
84 smtc_boot_secondary(cpu, idle);
85 }
86
ssmtc_smp_setup(void)87 static void __init ssmtc_smp_setup(void)
88 {
89 if (read_c0_config3() & (1 << 2))
90 mipsmt_build_cpu_map(0);
91 }
92
93 /*
94 * Platform SMP pre-initialization
95 */
ssmtc_prepare_cpus(unsigned int max_cpus)96 static void ssmtc_prepare_cpus(unsigned int max_cpus)
97 {
98 /*
99 * As noted above, we can assume a single CPU for now
100 * but it may be multithreaded.
101 */
102
103 if (read_c0_config3() & (1 << 2)) {
104 mipsmt_prepare_cpus();
105 }
106 }
107
108 struct plat_smp_ops ssmtc_smp_ops = {
109 .send_ipi_single = ssmtc_send_ipi_single,
110 .send_ipi_mask = ssmtc_send_ipi_mask,
111 .init_secondary = ssmtc_init_secondary,
112 .smp_finish = ssmtc_smp_finish,
113 .cpus_done = ssmtc_cpus_done,
114 .boot_secondary = ssmtc_boot_secondary,
115 .smp_setup = ssmtc_smp_setup,
116 .prepare_cpus = ssmtc_prepare_cpus,
117 };
118