sparc,leon: Sparc-Leon SMP support
Support SMP for a Sparc-Leon multiprocessor system.
Add Leon specific SMP code to arch/sparc/kernel/leon_smp.c.
Signed-off-by: Konrad Eisele <konrad@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index 54d8a5b..87f1760 100644
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -12,11 +12,14 @@
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
+
#include <asm/oplib.h>
#include <asm/timer.h>
#include <asm/prom.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>
+#include <asm/traps.h>
+#include <asm/cacheflush.h>
#include "prom.h"
#include "irq.h"
@@ -115,6 +118,21 @@
(((1000000 / 100) - 1)));
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0);
+#ifdef CONFIG_SMP
+ leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
+ leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1;
+
+ if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
+ (1<<LEON3_GPTIMER_SEPIRQ))) {
+ prom_printf("irq timer not configured with seperate irqs \n");
+ BUG();
+ }
+
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0);
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/100) - 1)));
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0);
+# endif
+
} else {
printk(KERN_ERR "No Timer/irqctrl found\n");
BUG();
@@ -130,11 +148,41 @@
prom_halt();
}
+# ifdef CONFIG_SMP
+ {
+ unsigned long flags;
+ struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];
+
+ /* For SMP we use the level 14 ticker, however the bootup code
+ * has copied the firmwares level 14 vector into boot cpu's
+ * trap table, we must fix this now or we get squashed.
+ */
+ local_irq_save(flags);
+
+ patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
+
+ /* Adjust so that we jump directly to smpleon_ticker */
+ trap_table->inst_three += smpleon_ticker - real_irq_entry;
+
+ local_flush_cache_all();
+ local_irq_restore(flags);
+ }
+# endif
+
if (leon3_gptimer_regs) {
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl,
LEON3_GPTIMER_EN |
LEON3_GPTIMER_RL |
LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
+
+#ifdef CONFIG_SMP
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl,
+ LEON3_GPTIMER_EN |
+ LEON3_GPTIMER_RL |
+ LEON3_GPTIMER_LD |
+ LEON3_GPTIMER_IRQEN);
+#endif
+
}
}
@@ -175,6 +223,42 @@
}
}
+#ifdef CONFIG_SMP
+
+void leon_set_cpu_int(int cpu, int level)
+{
+ unsigned long mask;
+ mask = get_irqmask(level);
+ LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
+}
+
+static void leon_clear_ipi(int cpu, int level)
+{
+ unsigned long mask;
+ mask = get_irqmask(level);
+ LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
+}
+
+static void leon_set_udt(int cpu)
+{
+}
+
+void leon_clear_profile_irq(int cpu)
+{
+}
+
+void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
+{
+ unsigned long mask, flags, *addr;
+ mask = get_irqmask(irq_nr);
+ local_irq_save(flags);
+ addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
+ LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
+ local_irq_restore(flags);
+}
+
+#endif
+
void __init leon_init_IRQ(void)
{
sparc_init_timers = leon_init_timers;