diff options
Diffstat (limited to 'kernel/arch/arm/mach-socfpga')
| -rw-r--r-- | kernel/arch/arm/mach-socfpga/Kconfig | 10 | ||||
| -rw-r--r-- | kernel/arch/arm/mach-socfpga/Makefile | 6 | ||||
| -rw-r--r-- | kernel/arch/arm/mach-socfpga/core.h | 50 | ||||
| -rw-r--r-- | kernel/arch/arm/mach-socfpga/headsmp.S | 37 | ||||
| -rw-r--r-- | kernel/arch/arm/mach-socfpga/platsmp.c | 105 | ||||
| -rw-r--r-- | kernel/arch/arm/mach-socfpga/socfpga.c | 119 |
6 files changed, 327 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-socfpga/Kconfig b/kernel/arch/arm/mach-socfpga/Kconfig new file mode 100644 index 000000000..b5f8d75d5 --- /dev/null +++ b/kernel/arch/arm/mach-socfpga/Kconfig @@ -0,0 +1,10 @@ +config ARCH_SOCFPGA + bool "Altera SOCFPGA family" if ARCH_MULTI_V7 + select ARM_AMBA + select ARM_GIC + select CACHE_L2X0 + select DW_APB_TIMER_OF + select GPIO_PL061 if GPIOLIB + select HAVE_ARM_SCU + select HAVE_ARM_TWD if SMP + select MFD_SYSCON diff --git a/kernel/arch/arm/mach-socfpga/Makefile b/kernel/arch/arm/mach-socfpga/Makefile new file mode 100644 index 000000000..6dd7a93a9 --- /dev/null +++ b/kernel/arch/arm/mach-socfpga/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for the linux kernel. +# + +obj-y := socfpga.o +obj-$(CONFIG_SMP) += headsmp.o platsmp.o diff --git a/kernel/arch/arm/mach-socfpga/core.h b/kernel/arch/arm/mach-socfpga/core.h new file mode 100644 index 000000000..a0f3b1cd4 --- /dev/null +++ b/kernel/arch/arm/mach-socfpga/core.h @@ -0,0 +1,50 @@ +/* + * 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 + +#define SOCFPGA_RSTMGR_CTRL 0x04 +#define SOCFPGA_RSTMGR_MODMPURST 0x10 +#define SOCFPGA_RSTMGR_MODPERRST 0x14 +#define SOCFPGA_RSTMGR_BRGMODRST 0x1c + +/* System Manager bits */ +#define RSTMGR_CTRL_SWCOLDRSTREQ 0x1 /* Cold Reset */ +#define RSTMGR_CTRL_SWWARMRSTREQ 0x2 /* Warm Reset */ + +#define RSTMGR_MPUMODRST_CPU1 0x2 /* CPU1 Reset */ + +extern void socfpga_secondary_startup(void); +extern void __iomem *socfpga_scu_base_addr; + +extern void socfpga_init_clocks(void); +extern void socfpga_sysmgr_init(void); + +extern void __iomem *sys_manager_base_addr; +extern void __iomem *rst_manager_base_addr; + +extern struct smp_operations socfpga_smp_ops; +extern char secondary_trampoline, secondary_trampoline_end; + +extern unsigned long socfpga_cpu1start_addr; + +#define SOCFPGA_SCU_VIRT_BASE 0xfee00000 + +#endif diff --git a/kernel/arch/arm/mach-socfpga/headsmp.S b/kernel/arch/arm/mach-socfpga/headsmp.S new file mode 100644 index 000000000..f65ea0af4 --- /dev/null +++ b/kernel/arch/arm/mach-socfpga/headsmp.S @@ -0,0 +1,37 @@ +/* + * 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> +#include <asm/memory.h> + + .arch armv7-a + +ENTRY(secondary_trampoline) + /* CPU1 will always fetch from 0x0 when it is brought out of reset. + * Thus, we can just subtract the PAGE_OFFSET to get the physical + * address of &cpu1start_addr. This would not work for platforms + * where the physical memory does not start at 0x0. + */ + adr r0, 1f + ldmia r0, {r1, r2} + sub r2, r2, #PAGE_OFFSET + ldr r3, [r2] + ldr r4, [r3] + bx r4 + + .align +1: .long . + .long socfpga_cpu1start_addr +ENTRY(secondary_trampoline_end) + +ENTRY(socfpga_secondary_startup) + bl v7_invalidate_l1 + b secondary_startup +ENDPROC(socfpga_secondary_startup) diff --git a/kernel/arch/arm/mach-socfpga/platsmp.c b/kernel/arch/arm/mach-socfpga/platsmp.c new file mode 100644 index 000000000..c64d89b7c --- /dev/null +++ b/kernel/arch/arm/mach-socfpga/platsmp.c @@ -0,0 +1,105 @@ +/* + * 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/smp_scu.h> +#include <asm/smp_plat.h> + +#include "core.h" + +static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; + + if (socfpga_cpu1start_addr) { + /* This will put CPU #1 into reset. */ + writel(RSTMGR_MPUMODRST_CPU1, + rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); + + memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); + + writel(virt_to_phys(socfpga_secondary_startup), + sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff)); + + flush_cache_all(); + smp_wmb(); + outer_clean_range(0, trampoline_size); + + /* This will release CPU #1 out of reset. */ + writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); + } + + 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); +} + +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) +{ + /* Do WFI. If we wake up early, go back into WFI */ + while (1) + cpu_do_idle(); +} + +struct smp_operations socfpga_smp_ops __initdata = { + .smp_init_cpus = socfpga_smp_init_cpus, + .smp_prepare_cpus = socfpga_smp_prepare_cpus, + .smp_boot_secondary = socfpga_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = socfpga_cpu_die, +#endif +}; diff --git a/kernel/arch/arm/mach-socfpga/socfpga.c b/kernel/arch/arm/mach-socfpga/socfpga.c new file mode 100644 index 000000000..f5e597c20 --- /dev/null +++ b/kernel/arch/arm/mach-socfpga/socfpga.c @@ -0,0 +1,119 @@ +/* + * 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, see <http://www.gnu.org/licenses/>. + */ +#include <linux/irqchip.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/reboot.h> + +#include <asm/hardware/cache-l2x0.h> +#include <asm/mach/arch.h> +#include <asm/mach/map.h> +#include <asm/cacheflush.h> + +#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; +unsigned long socfpga_cpu1start_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 struct map_desc uart_io_desc __initdata = { + .virtual = 0xfec02000, + .pfn = __phys_to_pfn(0xffc02000), + .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(); + iotable_init(&uart_io_desc, 1); + early_printk("Early printk initialized\n"); +} + +void __init socfpga_sysmgr_init(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "altr,sys-mgr"); + + if (of_property_read_u32(np, "cpu1-start-addr", + (u32 *) &socfpga_cpu1start_addr)) + pr_err("SMP: Need cpu1-start-addr in device tree.\n"); + + /* Ensure that socfpga_cpu1start_addr is visible to other CPUs */ + smp_wmb(); + sync_cache_w(&socfpga_cpu1start_addr); + + 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 socfpga_init_irq(void) +{ + irqchip_init(); + socfpga_sysmgr_init(); +} + +static void socfpga_cyclone5_restart(enum reboot_mode mode, const char *cmd) +{ + u32 temp; + + temp = readl(rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL); + + if (mode == REBOOT_HARD) + temp |= RSTMGR_CTRL_SWCOLDRSTREQ; + else + temp |= RSTMGR_CTRL_SWWARMRSTREQ; + writel(temp, rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL); +} + +static const char *altera_dt_match[] = { + "altr,socfpga", + NULL +}; + +DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA") + .l2c_aux_val = 0, + .l2c_aux_mask = ~0, + .smp = smp_ops(socfpga_smp_ops), + .map_io = socfpga_map_io, + .init_irq = socfpga_init_irq, + .restart = socfpga_cyclone5_restart, + .dt_compat = altera_dt_match, +MACHINE_END |