ARM: socfpga: Enable SMP for socfpga

Enable SMP for the SOCFPGA platform.

Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

8 files changed, 232 insertions, 2 deletions

diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
index 0772f5739f59..19aec421bb26 100644
--- a/arch/arm/boot/dts/socfpga.dtsi
+++ b/arch/arm/boot/dts/socfpga.dtsi
@@ -143,5 +143,15 @@
                         reg-shift = <2>;
                         reg-io-width = <4>;
                 };
+
+                rstmgr@ffd05000 {
+                                compatible = "altr,rst-mgr";
+                                reg = <0xffd05000 0x1000>;
+                        };
+
+                sysmgr@ffd08000 {
+                                compatible = "altr,sys-mgr";
+                                reg = <0xffd08000 0x4000>;
+                        };
         };
 };
diff --git a/arch/arm/configs/socfpga_defconfig b/arch/arm/configs/socfpga_defconfig
index 0ac1293dba10..4e1ce211d43f 100644
--- a/arch/arm/configs/socfpga_defconfig
+++ b/arch/arm/configs/socfpga_defconfig
@@ -18,9 +18,10 @@ CONFIG_MODULE_UNLOAD=y
 CONFIG_ARCH_SOCFPGA=y
 CONFIG_MACH_SOCFPGA_CYCLONE5=y
 CONFIG_ARM_THUMBEE=y
+# CONFIG_ARCH_VEXPRESS_CORTEX_A5_A9_ERRATA is not set
 # CONFIG_CACHE_L2X0 is not set
 CONFIG_HIGH_RES_TIMERS=y
-CONFIG_VMSPLIT_2G=y
+CONFIG_SMP=y
 CONFIG_NR_CPUS=2
 CONFIG_AEABI=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index 803a3281feb5..566e804d4036 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -12,5 +12,6 @@ config ARCH_SOCFPGA
         select GENERIC_CLOCKEVENTS
         select GPIO_PL061 if GPIOLIB
         select HAVE_ARM_SCU
+        select HAVE_SMP
         select SPARSE_IRQ
         select USE_OF
diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile
index 4fb93240971d..6dd7a93a90fe 100644
--- a/arch/arm/mach-socfpga/Makefile
+++ b/arch/arm/mach-socfpga/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-y                                   := socfpga.o
+obj-$(CONFIG_SMP)       += headsmp.o platsmp.o
diff --git a/arch/arm/mach-socfpga/core.h b/arch/arm/mach-socfpga/core.h
new file mode 100644
index 000000000000..9941caa94931
--- /dev/null
+++ b/arch/arm/mach-socfpga/core.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2012 Pavel Machek <pavel@denx.de>
+ * Copyright (C) 2012 Altera Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __MACH_CORE_H
+#define __MACH_CORE_H
+
+extern void secondary_startup(void);
+extern void __iomem *socfpga_scu_base_addr;
+
+extern void socfpga_init_clocks(void);
+extern void socfpga_sysmgr_init(void);
+
+extern struct smp_operations socfpga_smp_ops;
+extern char secondary_trampoline, secondary_trampoline_end;
+
+#define SOCFPGA_SCU_VIRT_BASE   0xfffec000
+
+#endif
diff --git a/arch/arm/mach-socfpga/headsmp.S b/arch/arm/mach-socfpga/headsmp.S
new file mode 100644
index 000000000000..17d6eaf9afff
--- /dev/null
+++ b/arch/arm/mach-socfpga/headsmp.S
@@ -0,0 +1,24 @@
+/*
+ *  Copyright (c) 2003 ARM Limited
+ *  Copyright (c) u-boot contributors
+ *  Copyright (c) 2012 Pavel Machek <pavel@denx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+        __INIT
+
+#define CPU1_START_ADDR                 0xffd08010
+
+ENTRY(secondary_trampoline)
+        movw    r0, #:lower16:CPU1_START_ADDR
+        movt  r0, #:upper16:CPU1_START_ADDR
+
+        ldr     r1, [r0]
+        bx      r1
+
+ENTRY(secondary_trampoline_end)
diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c
new file mode 100644
index 000000000000..68dd1b69512a
--- /dev/null
+++ b/arch/arm/mach-socfpga/platsmp.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2010-2011 Calxeda, Inc.
+ * Copyright 2012 Pavel Machek <pavel@denx.de>
+ * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
+ * Copyright (C) 2012 Altera Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/cacheflush.h>
+#include <asm/hardware/gic.h>
+#include <asm/smp_scu.h>
+#include <asm/smp_plat.h>
+
+#include "core.h"
+
+extern void __iomem *sys_manager_base_addr;
+extern void __iomem *rst_manager_base_addr;
+
+static void __cpuinit socfpga_secondary_init(unsigned int cpu)
+{
+        /*
+         * if any interrupts are already enabled for the primary
+         * core (e.g. timer irq), then they will not have been enabled
+         * for us: do so
+         */
+        gic_secondary_init(0);
+}
+
+static int __cpuinit socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+        int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
+
+        memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
+
+        __raw_writel(virt_to_phys(secondary_startup), (sys_manager_base_addr+0x10));
+
+        flush_cache_all();
+        smp_wmb();
+        outer_clean_range(0, trampoline_size);
+
+        /* This will release CPU #1 out of reset.*/
+        __raw_writel(0, rst_manager_base_addr + 0x10);
+
+        return 0;
+}
+
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+static void __init socfpga_smp_init_cpus(void)
+{
+        unsigned int i, ncores;
+
+        ncores = scu_get_core_count(socfpga_scu_base_addr);
+
+        for (i = 0; i < ncores; i++)
+                set_cpu_possible(i, true);
+
+        /* sanity check */
+        if (ncores > num_possible_cpus()) {
+                pr_warn("socfpga: no. of cores (%d) greater than configured"
+                        "maximum of %d - clipping\n", ncores, num_possible_cpus());
+                ncores = num_possible_cpus();
+        }
+
+        for (i = 0; i < ncores; i++)
+                set_cpu_possible(i, true);
+
+        set_smp_cross_call(gic_raise_softirq);
+}
+
+static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
+{
+        scu_enable(socfpga_scu_base_addr);
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+static void socfpga_cpu_die(unsigned int cpu)
+{
+        cpu_do_idle();
+
+        /* We should have never returned from idle */
+        panic("cpu %d unexpectedly exit from shutdown\n", cpu);
+}
+
+struct smp_operations socfpga_smp_ops __initdata = {
+        .smp_init_cpus          = socfpga_smp_init_cpus,
+        .smp_prepare_cpus       = socfpga_smp_prepare_cpus,
+        .smp_secondary_init     = socfpga_secondary_init,
+        .smp_boot_secondary     = socfpga_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+        .cpu_die                = socfpga_cpu_die,
+#endif
+};
diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
index f01e1ebf5396..ab81ea91a7c4 100644
--- a/arch/arm/mach-socfpga/socfpga.c
+++ b/arch/arm/mach-socfpga/socfpga.c
@@ -15,23 +15,64 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/dw_apb_timer.h>
+#include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/hardware/gic.h>
 #include <asm/mach/arch.h>
+#include <asm/mach/map.h>
 
-extern void socfpga_init_clocks(void);
+#include "core.h"
+
+void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE));
+void __iomem *sys_manager_base_addr;
+void __iomem *rst_manager_base_addr;
+
+static struct map_desc scu_io_desc __initdata = {
+        .virtual        = SOCFPGA_SCU_VIRT_BASE,
+        .pfn            = 0, /* run-time */
+        .length         = SZ_8K,
+        .type           = MT_DEVICE,
+};
+
+static void __init socfpga_scu_map_io(void)
+{
+        unsigned long base;
+
+        /* Get SCU base */
+        asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
+
+        scu_io_desc.pfn = __phys_to_pfn(base);
+        iotable_init(&scu_io_desc, 1);
+}
+
+static void __init socfpga_map_io(void)
+{
+        socfpga_scu_map_io();
+}
 
 const static struct of_device_id irq_match[] = {
         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
         {}
 };
 
+void __init socfpga_sysmgr_init(void)
+{
+        struct device_node *np;
+
+        np = of_find_compatible_node(NULL, NULL, "altr,sys-mgr");
+        sys_manager_base_addr = of_iomap(np, 0);
+
+        np = of_find_compatible_node(NULL, NULL, "altr,rst-mgr");
+        rst_manager_base_addr = of_iomap(np, 0);
+}
+
 static void __init gic_init_irq(void)
 {
         of_irq_init(irq_match);
+        socfpga_sysmgr_init();
 }
 
 static void socfpga_cyclone5_restart(char mode, const char *cmd)
@@ -53,6 +94,8 @@ static const char *altera_dt_match[] = {
 };
 
 DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA")
+        .smp            = smp_ops(socfpga_smp_ops),
+        .map_io         = socfpga_map_io,
         .init_irq       = gic_init_irq,
         .handle_irq     = gic_handle_irq,
         .timer          = &dw_apb_timer,