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Diffstat (limited to 'arch/mips/mips-boards/malta/malta_smp.c')
-rw-r--r--arch/mips/mips-boards/malta/malta_smp.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/mips/mips-boards/malta/malta_smp.c b/arch/mips/mips-boards/malta/malta_smp.c
new file mode 100644
index 00000000000..6c6c8eeedbc
--- /dev/null
+++ b/arch/mips/mips-boards/malta/malta_smp.c
@@ -0,0 +1,128 @@
+/*
+ * Malta Platform-specific hooks for SMP operation
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/cpumask.h>
+#include <linux/interrupt.h>
+
+#include <asm/atomic.h>
+#include <asm/cpu.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/hardirq.h>
+#include <asm/mmu_context.h>
+#include <asm/smp.h>
+#ifdef CONFIG_MIPS_MT_SMTC
+#include <asm/smtc_ipi.h>
+#endif /* CONFIG_MIPS_MT_SMTC */
+
+/* VPE/SMP Prototype implements platform interfaces directly */
+#if !defined(CONFIG_MIPS_MT_SMP)
+
+/*
+ * Cause the specified action to be performed on a targeted "CPU"
+ */
+
+void core_send_ipi(int cpu, unsigned int action)
+{
+/* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
+#ifdef CONFIG_MIPS_MT_SMTC
+ smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
+#endif /* CONFIG_MIPS_MT_SMTC */
+}
+
+/*
+ * Detect available CPUs/VPEs/TCs and populate phys_cpu_present_map
+ */
+
+void __init prom_build_cpu_map(void)
+{
+ int nextslot;
+
+ /*
+ * As of November, 2004, MIPSsim only simulates one core
+ * at a time. However, that core may be a MIPS MT core
+ * with multiple virtual processors and thread contexts.
+ */
+
+ if (read_c0_config3() & (1<<2)) {
+ nextslot = mipsmt_build_cpu_map(1);
+ }
+}
+
+/*
+ * Platform "CPU" startup hook
+ */
+
+void prom_boot_secondary(int cpu, struct task_struct *idle)
+{
+#ifdef CONFIG_MIPS_MT_SMTC
+ smtc_boot_secondary(cpu, idle);
+#endif /* CONFIG_MIPS_MT_SMTC */
+}
+
+/*
+ * Post-config but pre-boot cleanup entry point
+ */
+
+void prom_init_secondary(void)
+{
+#ifdef CONFIG_MIPS_MT_SMTC
+ void smtc_init_secondary(void);
+ int myvpe;
+
+ /* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */
+ myvpe = read_c0_tcbind() & TCBIND_CURVPE;
+ if (myvpe != 0) {
+ /* Ideally, this should be done only once per VPE, but... */
+ clear_c0_status(STATUSF_IP2);
+ set_c0_status(STATUSF_IP0 | STATUSF_IP1 | STATUSF_IP3
+ | STATUSF_IP4 | STATUSF_IP5 | STATUSF_IP6
+ | STATUSF_IP7);
+ }
+
+ smtc_init_secondary();
+#endif /* CONFIG_MIPS_MT_SMTC */
+}
+
+/*
+ * Platform SMP pre-initialization
+ *
+ * As noted above, we can assume a single CPU for now
+ * but it may be multithreaded.
+ */
+
+void plat_smp_setup(void)
+{
+ if (read_c0_config3() & (1<<2))
+ mipsmt_build_cpu_map(0);
+}
+
+void __init plat_prepare_cpus(unsigned int max_cpus)
+{
+ if (read_c0_config3() & (1<<2))
+ mipsmt_prepare_cpus();
+}
+
+/*
+ * SMP initialization finalization entry point
+ */
+
+void prom_smp_finish(void)
+{
+#ifdef CONFIG_MIPS_MT_SMTC
+ smtc_smp_finish();
+#endif /* CONFIG_MIPS_MT_SMTC */
+}
+
+/*
+ * Hook for after all CPUs are online
+ */
+
+void prom_cpus_done(void)
+{
+}
+
+#endif /* CONFIG_MIPS32R2_MT_SMP */