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>

arch/sparc/include/asm/leon.h

@@ -340,6 +340,30 @@ extern int leon_flush_needed(void);
 extern void leon_switch_mm(void);
 extern int srmmu_swprobe_trace;
 
+#ifdef CONFIG_SMP
+extern int leon_smp_nrcpus(void);
+extern void leon_clear_profile_irq(int cpu);
+extern void leon_smp_done(void);
+extern void leon_boot_cpus(void);
+extern int leon_boot_one_cpu(int i);
+void leon_init_smp(void);
+extern void cpu_probe(void);
+extern void cpu_idle(void);
+extern void init_IRQ(void);
+extern void cpu_panic(void);
+extern int __leon_processor_id(void);
+void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu);
+
+extern unsigned int real_irq_entry[], smpleon_ticker[];
+extern unsigned int patchme_maybe_smp_msg[];
+extern unsigned long trapbase_cpu1[];
+extern unsigned long trapbase_cpu2[];
+extern unsigned long trapbase_cpu3[];
+extern unsigned int t_nmi[], linux_trap_ipi15_leon[];
+extern unsigned int linux_trap_ipi15_sun4m[];
+
+#endif /* CONFIG_SMP */
+
 #endif /* __KERNEL__ */
 
 #endif /* __ASSEMBLY__ */
@@ -356,6 +380,10 @@ extern int srmmu_swprobe_trace;
 #define leon_switch_mm() do {} while (0)
 #define leon_init_IRQ() do {} while (0)
 #define init_leon() do {} while (0)
+#define leon_smp_done() do {} while (0)
+#define leon_boot_cpus() do {} while (0)
+#define leon_boot_one_cpu(i) 1
+#define leon_init_smp() do {} while (0)
 
 #endif /* !defined(CONFIG_SPARC_LEON) */
 

arch/sparc/include/asm/smp_32.h

@@ -106,6 +106,15 @@ static inline int hard_smp4d_processor_id(void)
 	return cpuid;
 }
 
+extern inline int hard_smpleon_processor_id(void)
+{
+	int cpuid;
+	__asm__ __volatile__("rd     %%asr17,%0\n\t"
+			     "srl    %0,28,%0" :
+			     "=&r" (cpuid) : );
+	return cpuid;
+}
+
 #ifndef MODULE
 static inline int hard_smp_processor_id(void)
 {

arch/sparc/kernel/Makefile

@@ -72,7 +72,7 @@ obj-y                     += dma.o
 obj-$(CONFIG_SPARC32_PCI) += pcic.o
 
 obj-$(CONFIG_SMP)         += trampoline_$(BITS).o smp_$(BITS).o
-obj-$(CONFIG_SPARC32_SMP) += sun4m_smp.o sun4d_smp.o
+obj-$(CONFIG_SPARC32_SMP) += sun4m_smp.o sun4d_smp.o leon_smp.o
 obj-$(CONFIG_SPARC64_SMP) += hvtramp.o
 
 obj-y                     += auxio_$(BITS).o

arch/sparc/kernel/entry.S

@@ -400,6 +400,39 @@ linux_trap_ipi15_sun4d:
 	/* FIXME */
 1:	b,a	1b
 
+#ifdef CONFIG_SPARC_LEON
+
+	.globl	smpleon_ticker
+	/* SMP per-cpu ticker interrupts are handled specially. */
+smpleon_ticker:
+        SAVE_ALL
+	or	%l0, PSR_PIL, %g2
+	wr	%g2, 0x0, %psr
+	WRITE_PAUSE
+	wr	%g2, PSR_ET, %psr
+	WRITE_PAUSE
+	call	leon_percpu_timer_interrupt
+	 add	%sp, STACKFRAME_SZ, %o0
+	wr	%l0, PSR_ET, %psr
+	WRITE_PAUSE
+	RESTORE_ALL
+
+	.align	4
+	.globl	linux_trap_ipi15_leon
+linux_trap_ipi15_leon:
+	SAVE_ALL
+	or	%l0, PSR_PIL, %l4
+	wr	%l4, 0x0, %psr
+	WRITE_PAUSE
+	wr	%l4, PSR_ET, %psr
+	WRITE_PAUSE
+	call	leon_cross_call_irq
+	 nop
+	b	ret_trap_lockless_ipi
+	 clr	%l6
+
+#endif /* CONFIG_SPARC_LEON */
+
 #endif /* CONFIG_SMP */
 
 	/* This routine handles illegal instructions and privileged

arch/sparc/kernel/head_32.S

@@ -811,8 +811,30 @@ found_version:
 got_prop:
 #ifdef CONFIG_SPARC_LEON
 	        /* no cpu-type check is needed, it is a SPARC-LEON */
+#ifdef CONFIG_SMP
+		ba leon_smp_init
+		 nop
+
+		.global leon_smp_init
+leon_smp_init:
+		sethi	%hi(boot_cpu_id), %g1    ! master always 0
+		stb	%g0, [%g1 + %lo(boot_cpu_id)]
+		sethi	%hi(boot_cpu_id4), %g1   ! master always 0
+		stb	%g0, [%g1 + %lo(boot_cpu_id4)]
+
+		rd     %asr17,%g1
+		srl    %g1,28,%g1
+
+		cmp %g0,%g1
+		 beq sun4c_continue_boot         !continue with master
+		nop
+
+		ba leon_smp_cpu_startup
+		 nop
+#else
 		ba sun4c_continue_boot
 		 nop
+#endif
 #endif
 		set	cputypval, %o2
 		ldub	[%o2 + 0x4], %l1

arch/sparc/kernel/ioport.c

@@ -48,8 +48,13 @@
 #include <asm/dma.h>
 #include <asm/iommu.h>
 #include <asm/io-unit.h>
+#include <asm/leon.h>
 
+#ifdef CONFIG_SPARC_LEON
+#define mmu_inval_dma_area(p, l) leon_flush_dcache_all()
+#else
 #define mmu_inval_dma_area(p, l)	/* Anton pulled it out for 2.4.0-xx */
+#endif
 
 static struct resource *_sparc_find_resource(struct resource *r,
 					     unsigned long);

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 @@ void __init leon_init_timers(irq_handler_t counter_fn)
 				      (((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 @@ void __init leon_init_timers(irq_handler_t counter_fn)
 		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 @@ void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
 	}
 }
 
+#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;