1 /*
2 * MSP71xx Platform-specific hooks for SMP operation
3 */
4 #include <linux/irq.h>
5 #include <linux/init.h>
6
7 #include <asm/mipsmtregs.h>
8 #include <asm/mipsregs.h>
9 #include <asm/smtc.h>
10 #include <asm/smtc_ipi.h>
11
12 /* VPE/SMP Prototype implements platform interfaces directly */
13
14 /*
15 * Cause the specified action to be performed on a targeted "CPU"
16 */
17
msp_smtc_send_ipi_single(int cpu,unsigned int action)18 static void msp_smtc_send_ipi_single(int cpu, unsigned int action)
19 {
20 /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
21 smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
22 }
23
msp_smtc_send_ipi_mask(const struct cpumask * mask,unsigned int action)24 static void msp_smtc_send_ipi_mask(const struct cpumask *mask,
25 unsigned int action)
26 {
27 unsigned int i;
28
29 for_each_cpu(i, mask)
30 msp_smtc_send_ipi_single(i, action);
31 }
32
33 /*
34 * Post-config but pre-boot cleanup entry point
35 */
msp_smtc_init_secondary(void)36 static void __cpuinit msp_smtc_init_secondary(void)
37 {
38 int myvpe;
39
40 /* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */
41 myvpe = read_c0_tcbind() & TCBIND_CURVPE;
42 if (myvpe > 0)
43 change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
44 STATUSF_IP6 | STATUSF_IP7);
45 smtc_init_secondary();
46 }
47
48 /*
49 * Platform "CPU" startup hook
50 */
msp_smtc_boot_secondary(int cpu,struct task_struct * idle)51 static void __cpuinit msp_smtc_boot_secondary(int cpu,
52 struct task_struct *idle)
53 {
54 smtc_boot_secondary(cpu, idle);
55 }
56
57 /*
58 * SMP initialization finalization entry point
59 */
msp_smtc_smp_finish(void)60 static void __cpuinit msp_smtc_smp_finish(void)
61 {
62 smtc_smp_finish();
63 }
64
65 /*
66 * Hook for after all CPUs are online
67 */
68
msp_smtc_cpus_done(void)69 static void msp_smtc_cpus_done(void)
70 {
71 }
72
73 /*
74 * Platform SMP pre-initialization
75 *
76 * As noted above, we can assume a single CPU for now
77 * but it may be multithreaded.
78 */
79
msp_smtc_smp_setup(void)80 static void __init msp_smtc_smp_setup(void)
81 {
82 /*
83 * we won't get the definitive value until
84 * we've run smtc_prepare_cpus later, but
85 */
86
87 if (read_c0_config3() & (1 << 2))
88 smp_num_siblings = smtc_build_cpu_map(0);
89 }
90
msp_smtc_prepare_cpus(unsigned int max_cpus)91 static void __init msp_smtc_prepare_cpus(unsigned int max_cpus)
92 {
93 smtc_prepare_cpus(max_cpus);
94 }
95
96 struct plat_smp_ops msp_smtc_smp_ops = {
97 .send_ipi_single = msp_smtc_send_ipi_single,
98 .send_ipi_mask = msp_smtc_send_ipi_mask,
99 .init_secondary = msp_smtc_init_secondary,
100 .smp_finish = msp_smtc_smp_finish,
101 .cpus_done = msp_smtc_cpus_done,
102 .boot_secondary = msp_smtc_boot_secondary,
103 .smp_setup = msp_smtc_smp_setup,
104 .prepare_cpus = msp_smtc_prepare_cpus,
105 };
106