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39b8d525 RB |
1 | /* |
2 | * This program is free software; you can distribute it and/or modify it | |
3 | * under the terms of the GNU General Public License (Version 2) as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope it will be useful, but WITHOUT | |
7 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
8 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
9 | * for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License along | |
12 | * with this program; if not, write to the Free Software Foundation, Inc., | |
13 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
14 | * | |
15 | * Copyright (C) 2007 MIPS Technologies, Inc. | |
16 | * Chris Dearman (chris@mips.com) | |
17 | */ | |
18 | ||
19 | #undef DEBUG | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/sched.h> | |
631330f5 | 23 | #include <linux/smp.h> |
39b8d525 RB |
24 | #include <linux/cpumask.h> |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/compiler.h> | |
27 | ||
28 | #include <asm/atomic.h> | |
29 | #include <asm/cacheflush.h> | |
30 | #include <asm/cpu.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/hardirq.h> | |
34 | #include <asm/mmu_context.h> | |
35 | #include <asm/smp.h> | |
36 | #include <asm/time.h> | |
37 | #include <asm/mipsregs.h> | |
38 | #include <asm/mipsmtregs.h> | |
39 | #include <asm/mips_mt.h> | |
0365070f TA |
40 | #include <asm/amon.h> |
41 | #include <asm/gic.h> | |
39b8d525 RB |
42 | |
43 | static void ipi_call_function(unsigned int cpu) | |
44 | { | |
39b8d525 RB |
45 | pr_debug("CPU%d: %s cpu %d status %08x\n", |
46 | smp_processor_id(), __func__, cpu, read_c0_status()); | |
47 | ||
0365070f | 48 | gic_send_ipi(plat_ipi_call_int_xlate(cpu)); |
39b8d525 RB |
49 | } |
50 | ||
51 | ||
52 | static void ipi_resched(unsigned int cpu) | |
53 | { | |
39b8d525 RB |
54 | pr_debug("CPU%d: %s cpu %d status %08x\n", |
55 | smp_processor_id(), __func__, cpu, read_c0_status()); | |
56 | ||
0365070f | 57 | gic_send_ipi(plat_ipi_resched_int_xlate(cpu)); |
39b8d525 RB |
58 | } |
59 | ||
60 | /* | |
61 | * FIXME: This isn't restricted to CMP | |
62 | * The SMVP kernel could use GIC interrupts if available | |
63 | */ | |
64 | void cmp_send_ipi_single(int cpu, unsigned int action) | |
65 | { | |
66 | unsigned long flags; | |
67 | ||
68 | local_irq_save(flags); | |
69 | ||
70 | switch (action) { | |
71 | case SMP_CALL_FUNCTION: | |
72 | ipi_call_function(cpu); | |
73 | break; | |
74 | ||
75 | case SMP_RESCHEDULE_YOURSELF: | |
76 | ipi_resched(cpu); | |
77 | break; | |
78 | } | |
79 | ||
80 | local_irq_restore(flags); | |
81 | } | |
82 | ||
48a048fe | 83 | static void cmp_send_ipi_mask(const struct cpumask *mask, unsigned int action) |
39b8d525 RB |
84 | { |
85 | unsigned int i; | |
86 | ||
48a048fe | 87 | for_each_cpu(i, mask) |
39b8d525 RB |
88 | cmp_send_ipi_single(i, action); |
89 | } | |
90 | ||
91 | static void cmp_init_secondary(void) | |
92 | { | |
93 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
94 | ||
95 | /* Assume GIC is present */ | |
96 | change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP4 | STATUSF_IP6 | | |
97 | STATUSF_IP7); | |
98 | ||
99 | /* Enable per-cpu interrupts: platform specific */ | |
100 | ||
101 | c->core = (read_c0_ebase() >> 1) & 0xff; | |
102 | #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC) | |
103 | c->vpe_id = (read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) & TCBIND_CURVPE; | |
104 | #endif | |
105 | #ifdef CONFIG_MIPS_MT_SMTC | |
106 | c->tc_id = (read_c0_tcbind() >> TCBIND_CURTC_SHIFT) & TCBIND_CURTC; | |
107 | #endif | |
108 | } | |
109 | ||
110 | static void cmp_smp_finish(void) | |
111 | { | |
112 | pr_debug("SMPCMP: CPU%d: %s\n", smp_processor_id(), __func__); | |
113 | ||
114 | /* CDFIXME: remove this? */ | |
115 | write_c0_compare(read_c0_count() + (8 * mips_hpt_frequency / HZ)); | |
116 | ||
117 | #ifdef CONFIG_MIPS_MT_FPAFF | |
118 | /* If we have an FPU, enroll ourselves in the FPU-full mask */ | |
119 | if (cpu_has_fpu) | |
120 | cpu_set(smp_processor_id(), mt_fpu_cpumask); | |
121 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
122 | ||
123 | local_irq_enable(); | |
124 | } | |
125 | ||
126 | static void cmp_cpus_done(void) | |
127 | { | |
128 | pr_debug("SMPCMP: CPU%d: %s\n", smp_processor_id(), __func__); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Setup the PC, SP, and GP of a secondary processor and start it running | |
133 | * smp_bootstrap is the place to resume from | |
134 | * __KSTK_TOS(idle) is apparently the stack pointer | |
135 | * (unsigned long)idle->thread_info the gp | |
136 | */ | |
137 | static void cmp_boot_secondary(int cpu, struct task_struct *idle) | |
138 | { | |
139 | struct thread_info *gp = task_thread_info(idle); | |
140 | unsigned long sp = __KSTK_TOS(idle); | |
141 | unsigned long pc = (unsigned long)&smp_bootstrap; | |
142 | unsigned long a0 = 0; | |
143 | ||
144 | pr_debug("SMPCMP: CPU%d: %s cpu %d\n", smp_processor_id(), | |
145 | __func__, cpu); | |
146 | ||
147 | #if 0 | |
148 | /* Needed? */ | |
149 | flush_icache_range((unsigned long)gp, | |
150 | (unsigned long)(gp + sizeof(struct thread_info))); | |
151 | #endif | |
152 | ||
0365070f | 153 | amon_cpu_start(cpu, pc, sp, (unsigned long)gp, a0); |
39b8d525 RB |
154 | } |
155 | ||
156 | /* | |
157 | * Common setup before any secondaries are started | |
158 | */ | |
159 | void __init cmp_smp_setup(void) | |
160 | { | |
161 | int i; | |
162 | int ncpu = 0; | |
163 | ||
164 | pr_debug("SMPCMP: CPU%d: %s\n", smp_processor_id(), __func__); | |
165 | ||
166 | #ifdef CONFIG_MIPS_MT_FPAFF | |
167 | /* If we have an FPU, enroll ourselves in the FPU-full mask */ | |
168 | if (cpu_has_fpu) | |
169 | cpu_set(0, mt_fpu_cpumask); | |
170 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
171 | ||
172 | for (i = 1; i < NR_CPUS; i++) { | |
173 | if (amon_cpu_avail(i)) { | |
98a79d6a | 174 | cpu_set(i, cpu_possible_map); |
39b8d525 RB |
175 | __cpu_number_map[i] = ++ncpu; |
176 | __cpu_logical_map[ncpu] = i; | |
177 | } | |
178 | } | |
179 | ||
180 | if (cpu_has_mipsmt) { | |
181 | unsigned int nvpe, mvpconf0 = read_c0_mvpconf0(); | |
182 | ||
183 | nvpe = ((mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1; | |
184 | smp_num_siblings = nvpe; | |
185 | } | |
186 | pr_info("Detected %i available secondary CPU(s)\n", ncpu); | |
187 | } | |
188 | ||
189 | void __init cmp_prepare_cpus(unsigned int max_cpus) | |
190 | { | |
191 | pr_debug("SMPCMP: CPU%d: %s max_cpus=%d\n", | |
192 | smp_processor_id(), __func__, max_cpus); | |
193 | ||
194 | /* | |
195 | * FIXME: some of these options are per-system, some per-core and | |
196 | * some per-cpu | |
197 | */ | |
198 | mips_mt_set_cpuoptions(); | |
199 | } | |
200 | ||
201 | struct plat_smp_ops cmp_smp_ops = { | |
202 | .send_ipi_single = cmp_send_ipi_single, | |
203 | .send_ipi_mask = cmp_send_ipi_mask, | |
204 | .init_secondary = cmp_init_secondary, | |
205 | .smp_finish = cmp_smp_finish, | |
206 | .cpus_done = cmp_cpus_done, | |
207 | .boot_secondary = cmp_boot_secondary, | |
208 | .smp_setup = cmp_smp_setup, | |
209 | .prepare_cpus = cmp_prepare_cpus, | |
210 | }; |