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>

8 files changed, 691 insertions, 2 deletions

diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index 5b47fab9966e..6b3b076173f4 100644
--- a/arch/sparc/kernel/Makefile
+++ b/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
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index f41ecc5ac0b4..ec9c7bc67d21 100644
--- a/arch/sparc/kernel/entry.S
+++ b/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
diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S
index 439d82a95ac9..21bb2590d4ae 100644
--- a/arch/sparc/kernel/head_32.S
+++ b/arch/sparc/kernel/head_32.S
@@ -811,9 +811,31 @@ 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
 
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 9f61fd8cbb7b..3c8c44f6a41c 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/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);
diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index 54d8a5bd4824..87f1760c0aa2 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 @@ 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;
diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c
new file mode 100644
index 000000000000..05c0dadd6371
--- /dev/null
+++ b/arch/sparc/kernel/leon_smp.c
@@ -0,0 +1,468 @@
+/* leon_smp.c: Sparc-Leon SMP support.
+ *
+ * based on sun4m_smp.c
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
+ * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
+ */
+
+#include <asm/head.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/threads.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/profile.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
+
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+#include <asm/ptrace.h>
+#include <asm/atomic.h>
+#include <asm/irq_regs.h>
+
+#include <asm/delay.h>
+#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/oplib.h>
+#include <asm/cpudata.h>
+#include <asm/asi.h>
+#include <asm/leon.h>
+#include <asm/leon_amba.h>
+
+#ifdef CONFIG_SPARC_LEON
+
+#include "irq.h"
+
+extern ctxd_t *srmmu_ctx_table_phys;
+static int smp_processors_ready;
+extern volatile unsigned long cpu_callin_map[NR_CPUS];
+extern unsigned char boot_cpu_id;
+extern cpumask_t smp_commenced_mask;
+void __init leon_configure_cache_smp(void);
+
+static inline unsigned long do_swap(volatile unsigned long *ptr,
+                                    unsigned long val)
+{
+        __asm__ __volatile__("swapa [%1] %2, %0\n\t" : "=&r"(val)
+                             : "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
+                             : "memory");
+        return val;
+}
+
+static void smp_setup_percpu_timer(void);
+
+void __cpuinit leon_callin(void)
+{
+        int cpuid = hard_smpleon_processor_id();
+
+        local_flush_cache_all();
+        local_flush_tlb_all();
+        leon_configure_cache_smp();
+
+        /* Get our local ticker going. */
+        smp_setup_percpu_timer();
+
+        calibrate_delay();
+        smp_store_cpu_info(cpuid);
+
+        local_flush_cache_all();
+        local_flush_tlb_all();
+
+        /*
+         * Unblock the master CPU _only_ when the scheduler state
+         * of all secondary CPUs will be up-to-date, so after
+         * the SMP initialization the master will be just allowed
+         * to call the scheduler code.
+         * Allow master to continue.
+         */
+        do_swap(&cpu_callin_map[cpuid], 1);
+
+        local_flush_cache_all();
+        local_flush_tlb_all();
+
+        cpu_probe();
+
+        /* Fix idle thread fields. */
+        __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
+                             : "memory" /* paranoid */);
+
+        /* Attach to the address space of init_task. */
+        atomic_inc(&init_mm.mm_count);
+        current->active_mm = &init_mm;
+
+        while (!cpu_isset(cpuid, smp_commenced_mask))
+                mb();
+
+        local_irq_enable();
+        cpu_set(cpuid, cpu_online_map);
+}
+
+/*
+ *      Cycle through the processors asking the PROM to start each one.
+ */
+
+extern struct linux_prom_registers smp_penguin_ctable;
+
+void __init leon_configure_cache_smp(void)
+{
+        unsigned long cfg = sparc_leon3_get_dcachecfg();
+        int me = smp_processor_id();
+
+        if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
+                printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
+                     (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
+                     (unsigned int)cfg, (unsigned int)me);
+                sparc_leon3_disable_cache();
+        } else {
+                if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
+                        sparc_leon3_enable_snooping();
+                } else {
+                        printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
+                             me);
+                        sparc_leon3_disable_cache();
+                }
+        }
+
+        local_flush_cache_all();
+        local_flush_tlb_all();
+}
+
+void leon_smp_setbroadcast(unsigned int mask)
+{
+        int broadcast =
+            ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
+              LEON3_IRQMPSTATUS_BROADCAST) & 1);
+        if (!broadcast) {
+                prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
+                     leon_smp_nrcpus());
+                if (leon_smp_nrcpus() > 1) {
+                        BUG();
+                } else {
+                        prom_printf("continue anyway\n");
+                        return;
+                }
+        }
+        LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
+}
+
+unsigned int leon_smp_getbroadcast(void)
+{
+        unsigned int mask;
+        mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
+        return mask;
+}
+
+int leon_smp_nrcpus(void)
+{
+        int nrcpu =
+            ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
+              LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
+        return nrcpu;
+}
+
+void __init leon_boot_cpus(void)
+{
+        int nrcpu = leon_smp_nrcpus();
+        int me = smp_processor_id();
+
+        printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x \n", (unsigned int)me,
+               (unsigned int)nrcpu, (unsigned int)NR_CPUS,
+               (unsigned int)&(leon3_irqctrl_regs->mpstatus));
+
+        leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
+        leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
+        leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);
+
+        leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
+
+        leon_configure_cache_smp();
+        smp_setup_percpu_timer();
+        local_flush_cache_all();
+
+}
+
+int __cpuinit leon_boot_one_cpu(int i)
+{
+
+        struct task_struct *p;
+        int timeout;
+
+        /* Cook up an idler for this guy. */
+        p = fork_idle(i);
+
+        current_set[i] = task_thread_info(p);
+
+        /* See trampoline.S:leon_smp_cpu_startup for details...
+         * Initialize the contexts table
+         * Since the call to prom_startcpu() trashes the structure,
+         * we need to re-initialize it for each cpu
+         */
+        smp_penguin_ctable.which_io = 0;
+        smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
+        smp_penguin_ctable.reg_size = 0;
+
+        /* whirrr, whirrr, whirrrrrrrrr... */
+        printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
+               (unsigned int)&leon3_irqctrl_regs->mpstatus);
+        local_flush_cache_all();
+
+        LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
+
+        /* wheee... it's going... */
+        for (timeout = 0; timeout < 10000; timeout++) {
+                if (cpu_callin_map[i])
+                        break;
+                udelay(200);
+        }
+        printk(KERN_INFO "Started CPU %d \n", (unsigned int)i);
+
+        if (!(cpu_callin_map[i])) {
+                printk(KERN_ERR "Processor %d is stuck.\n", i);
+                return -ENODEV;
+        } else {
+                leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
+                leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
+                leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
+        }
+
+        local_flush_cache_all();
+        return 0;
+}
+
+void __init leon_smp_done(void)
+{
+
+        int i, first;
+        int *prev;
+
+        /* setup cpu list for irq rotation */
+        first = 0;
+        prev = &first;
+        for (i = 0; i < NR_CPUS; i++) {
+                if (cpu_online(i)) {
+                        *prev = i;
+                        prev = &cpu_data(i).next;
+                }
+        }
+        *prev = first;
+        local_flush_cache_all();
+
+        /* Free unneeded trap tables */
+        if (!cpu_isset(1, cpu_present_map)) {
+                ClearPageReserved(virt_to_page(trapbase_cpu1));
+                init_page_count(virt_to_page(trapbase_cpu1));
+                free_page((unsigned long)trapbase_cpu1);
+                totalram_pages++;
+                num_physpages++;
+        }
+        if (!cpu_isset(2, cpu_present_map)) {
+                ClearPageReserved(virt_to_page(trapbase_cpu2));
+                init_page_count(virt_to_page(trapbase_cpu2));
+                free_page((unsigned long)trapbase_cpu2);
+                totalram_pages++;
+                num_physpages++;
+        }
+        if (!cpu_isset(3, cpu_present_map)) {
+                ClearPageReserved(virt_to_page(trapbase_cpu3));
+                init_page_count(virt_to_page(trapbase_cpu3));
+                free_page((unsigned long)trapbase_cpu3);
+                totalram_pages++;
+                num_physpages++;
+        }
+        /* Ok, they are spinning and ready to go. */
+        smp_processors_ready = 1;
+
+}
+
+void leon_irq_rotate(int cpu)
+{
+}
+
+static struct smp_funcall {
+        smpfunc_t func;
+        unsigned long arg1;
+        unsigned long arg2;
+        unsigned long arg3;
+        unsigned long arg4;
+        unsigned long arg5;
+        unsigned long processors_in[NR_CPUS];   /* Set when ipi entered. */
+        unsigned long processors_out[NR_CPUS];  /* Set when ipi exited. */
+} ccall_info;
+
+static DEFINE_SPINLOCK(cross_call_lock);
+
+/* Cross calls must be serialized, at least currently. */
+static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
+                            unsigned long arg2, unsigned long arg3,
+                            unsigned long arg4)
+{
+        if (smp_processors_ready) {
+                register int high = NR_CPUS - 1;
+                unsigned long flags;
+
+                spin_lock_irqsave(&cross_call_lock, flags);
+
+                {
+                        /* If you make changes here, make sure gcc generates proper code... */
+                        register smpfunc_t f asm("i0") = func;
+                        register unsigned long a1 asm("i1") = arg1;
+                        register unsigned long a2 asm("i2") = arg2;
+                        register unsigned long a3 asm("i3") = arg3;
+                        register unsigned long a4 asm("i4") = arg4;
+                        register unsigned long a5 asm("i5") = 0;
+
+                        __asm__ __volatile__("std %0, [%6]\n\t"
+                                             "std %2, [%6 + 8]\n\t"
+                                             "std %4, [%6 + 16]\n\t" : :
+                                             "r"(f), "r"(a1), "r"(a2), "r"(a3),
+                                             "r"(a4), "r"(a5),
+                                             "r"(&ccall_info.func));
+                }
+
+                /* Init receive/complete mapping, plus fire the IPI's off. */
+                {
+                        register int i;
+
+                        cpu_clear(smp_processor_id(), mask);
+                        cpus_and(mask, cpu_online_map, mask);
+                        for (i = 0; i <= high; i++) {
+                                if (cpu_isset(i, mask)) {
+                                        ccall_info.processors_in[i] = 0;
+                                        ccall_info.processors_out[i] = 0;
+                                        set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
+
+                                }
+                        }
+                }
+
+                {
+                        register int i;
+
+                        i = 0;
+                        do {
+                                if (!cpu_isset(i, mask))
+                                        continue;
+
+                                while (!ccall_info.processors_in[i])
+                                        barrier();
+                        } while (++i <= high);
+
+                        i = 0;
+                        do {
+                                if (!cpu_isset(i, mask))
+                                        continue;
+
+                                while (!ccall_info.processors_out[i])
+                                        barrier();
+                        } while (++i <= high);
+                }
+
+                spin_unlock_irqrestore(&cross_call_lock, flags);
+        }
+}
+
+/* Running cross calls. */
+void leon_cross_call_irq(void)
+{
+        int i = smp_processor_id();
+
+        ccall_info.processors_in[i] = 1;
+        ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
+                        ccall_info.arg4, ccall_info.arg5);
+        ccall_info.processors_out[i] = 1;
+}
+
+void leon_percpu_timer_interrupt(struct pt_regs *regs)
+{
+        struct pt_regs *old_regs;
+        int cpu = smp_processor_id();
+
+        old_regs = set_irq_regs(regs);
+
+        leon_clear_profile_irq(cpu);
+
+        profile_tick(CPU_PROFILING);
+
+        if (!--prof_counter(cpu)) {
+                int user = user_mode(regs);
+
+                irq_enter();
+                update_process_times(user);
+                irq_exit();
+
+                prof_counter(cpu) = prof_multiplier(cpu);
+        }
+        set_irq_regs(old_regs);
+}
+
+static void __init smp_setup_percpu_timer(void)
+{
+        int cpu = smp_processor_id();
+
+        prof_counter(cpu) = prof_multiplier(cpu) = 1;
+}
+
+void __init leon_blackbox_id(unsigned *addr)
+{
+        int rd = *addr & 0x3e000000;
+        int rs1 = rd >> 11;
+
+        /* patch places where ___b_hard_smp_processor_id appears */
+        addr[0] = 0x81444000 | rd;      /* rd %asr17, reg */
+        addr[1] = 0x8130201c | rd | rs1;        /* srl reg, 0x1c, reg */
+        addr[2] = 0x01000000;   /* nop */
+}
+
+void __init leon_blackbox_current(unsigned *addr)
+{
+        int rd = *addr & 0x3e000000;
+        int rs1 = rd >> 11;
+
+        /* patch LOAD_CURRENT macro where ___b_load_current appears */
+        addr[0] = 0x81444000 | rd;      /* rd %asr17, reg */
+        addr[2] = 0x8130201c | rd | rs1;        /* srl reg, 0x1c, reg */
+        addr[4] = 0x81282002 | rd | rs1;        /* sll reg, 0x2, reg */
+
+}
+
+/*
+ * CPU idle callback function
+ * See .../arch/sparc/kernel/process.c
+ */
+void pmc_leon_idle(void)
+{
+        __asm__ volatile ("mov %g0, %asr19");
+}
+
+void __init leon_init_smp(void)
+{
+        /* Patch ipi15 trap table */
+        t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
+
+        BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
+        BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
+        BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
+        BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
+                        BTFIXUPCALL_NORM);
+
+#ifndef PMC_NO_IDLE
+        /* Assign power management IDLE handler */
+        pm_idle = pmc_leon_idle;
+        printk(KERN_INFO "leon: power management initialized\n");
+#endif
+
+}
+
+#endif /* CONFIG_SPARC_LEON */
diff --git a/arch/sparc/kernel/smp_32.c b/arch/sparc/kernel/smp_32.c
index 132d81fb2616..91c10fb70858 100644
--- a/arch/sparc/kernel/smp_32.c
+++ b/arch/sparc/kernel/smp_32.c
@@ -32,6 +32,7 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm/cpudata.h>
+#include <asm/leon.h>
 
 #include "irq.h"
 
@@ -96,6 +97,9 @@ void __init smp_cpus_done(unsigned int max_cpus)
         case sun4d:
                 smp4d_smp_done();
                 break;
+        case sparc_leon:
+                leon_smp_done();
+                break;
         case sun4e:
                 printk("SUN4E\n");
                 BUG();
@@ -306,6 +310,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         case sun4d:
                 smp4d_boot_cpus();
                 break;
+        case sparc_leon:
+                leon_boot_cpus();
+                break;
         case sun4e:
                 printk("SUN4E\n");
                 BUG();
@@ -376,6 +383,9 @@ int __cpuinit __cpu_up(unsigned int cpu)
         case sun4d:
                 ret = smp4d_boot_one_cpu(cpu);
                 break;
+        case sparc_leon:
+                ret = leon_boot_one_cpu(cpu);
+                break;
         case sun4e:
                 printk("SUN4E\n");
                 BUG();
diff --git a/arch/sparc/kernel/trampoline_32.S b/arch/sparc/kernel/trampoline_32.S
index 5e235c52d667..691f484e03b3 100644
--- a/arch/sparc/kernel/trampoline_32.S
+++ b/arch/sparc/kernel/trampoline_32.S
@@ -15,7 +15,7 @@
 #include <asm/contregs.h>
 #include <asm/thread_info.h>
 
-        .globl sun4m_cpu_startup, __smp4m_processor_id
+        .globl sun4m_cpu_startup, __smp4m_processor_id, __leon_processor_id
         .globl sun4d_cpu_startup, __smp4d_processor_id
 
         __CPUINIT
@@ -106,6 +106,12 @@ __smp4d_processor_id:
         retl
          mov    %g1, %o7
 
+__leon_processor_id:
+        rd     %asr17,%g2
+        srl    %g2,28,%g2
+        retl
+         mov    %g1, %o7
+
 /* CPUID in bootbus can be found at PA 0xff0140000 */
 #define SUN4D_BOOTBUS_CPUID     0xf0140000
 
@@ -160,3 +166,64 @@ sun4d_cpu_startup:
          nop
 
         b,a     smp_do_cpu_idle
+
+#ifdef CONFIG_SPARC_LEON
+
+        __CPUINIT
+        .align  4
+        .global leon_smp_cpu_startup, smp_penguin_ctable
+
+leon_smp_cpu_startup:
+
+        set smp_penguin_ctable,%g1
+        ld [%g1+4],%g1
+        srl %g1,4,%g1
+        set 0x00000100,%g5 /* SRMMU_CTXTBL_PTR */
+        sta %g1, [%g5] ASI_M_MMUREGS
+
+        /* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */
+        set     (PSR_PIL | PSR_S | PSR_PS), %g1
+        wr      %g1, 0x0, %psr          ! traps off though
+        WRITE_PAUSE
+
+        /* Our %wim is one behind CWP */
+        mov     2, %g1
+        wr      %g1, 0x0, %wim
+        WRITE_PAUSE
+
+        /* Set tbr - we use just one trap table. */
+        set     trapbase, %g1
+        wr      %g1, 0x0, %tbr
+        WRITE_PAUSE
+
+        /* Get our CPU id */
+        rd     %asr17,%g3
+
+        /* Give ourselves a stack and curptr. */
+        set     current_set, %g5
+        srl     %g3, 28, %g4
+        sll     %g4, 2, %g4
+        ld      [%g5 + %g4], %g6
+
+        sethi   %hi(THREAD_SIZE - STACKFRAME_SZ), %sp
+        or      %sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp
+        add     %g6, %sp, %sp
+
+        /* Turn on traps (PSR_ET). */
+        rd      %psr, %g1
+        wr      %g1, PSR_ET, %psr       ! traps on
+        WRITE_PAUSE
+
+        /* Init our caches, etc. */
+        set     poke_srmmu, %g5
+        ld      [%g5], %g5
+        call    %g5
+         nop
+
+        /* Start this processor. */
+        call    leon_callin
+         nop
+
+        b,a     smp_do_cpu_idle
+
+#endif