diff options
Diffstat (limited to 'arch/arm/mach-axxia')
| -rw-r--r-- | arch/arm/mach-axxia/Kconfig | 15 | ||||
| -rw-r--r-- | arch/arm/mach-axxia/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/mach-axxia/axxia.c | 28 | ||||
| -rw-r--r-- | arch/arm/mach-axxia/platsmp.c | 89 |
4 files changed, 135 insertions, 0 deletions
diff --git a/arch/arm/mach-axxia/Kconfig b/arch/arm/mach-axxia/Kconfig new file mode 100644 index 000000000..d3eae6037 --- /dev/null +++ b/arch/arm/mach-axxia/Kconfig @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 +config ARCH_AXXIA + bool "LSI Axxia platforms" + depends on ARCH_MULTI_V7 && ARM_LPAE + select ARM_AMBA + select ARM_GIC + select ARM_TIMER_SP804 + select HAVE_ARM_ARCH_TIMER + select MFD_SYSCON + select ZONE_DMA + help + This enables support for the LSI Axxia devices. + + The LSI Axxia platforms require a Flattened Device Tree to be passed + to the kernel. diff --git a/arch/arm/mach-axxia/Makefile b/arch/arm/mach-axxia/Makefile new file mode 100644 index 000000000..8df8fe76a --- /dev/null +++ b/arch/arm/mach-axxia/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-y += axxia.o +obj-$(CONFIG_SMP) += platsmp.o diff --git a/arch/arm/mach-axxia/axxia.c b/arch/arm/mach-axxia/axxia.c new file mode 100644 index 000000000..4db76a493 --- /dev/null +++ b/arch/arm/mach-axxia/axxia.c @@ -0,0 +1,28 @@ +/* + * Support for the LSI Axxia SoC devices based on ARM cores. + * + * Copyright (C) 2012 LSI + * + * 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. + */ +#include <linux/init.h> +#include <asm/mach/arch.h> + +static const char *const axxia_dt_match[] __initconst = { + "lsi,axm5516", + "lsi,axm5516-sim", + "lsi,axm5516-emu", + NULL +}; + +DT_MACHINE_START(AXXIA_DT, "LSI Axxia AXM55XX") + .dt_compat = axxia_dt_match, +MACHINE_END diff --git a/arch/arm/mach-axxia/platsmp.c b/arch/arm/mach-axxia/platsmp.c new file mode 100644 index 000000000..502e3df69 --- /dev/null +++ b/arch/arm/mach-axxia/platsmp.c @@ -0,0 +1,89 @@ +/* + * linux/arch/arm/mach-axxia/platsmp.c + * + * Copyright (C) 2012 LSI Corporation + * + * 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/init.h> +#include <linux/io.h> +#include <linux/smp.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <asm/cacheflush.h> + +/* Syscon register offsets for releasing cores from reset */ +#define SC_CRIT_WRITE_KEY 0x1000 +#define SC_RST_CPU_HOLD 0x1010 + +/* + * Write the kernel entry point for secondary CPUs to the specified address + */ +static void write_release_addr(u32 release_phys) +{ + u32 *virt = (u32 *) phys_to_virt(release_phys); + writel_relaxed(__pa_symbol(secondary_startup), virt); + /* Make sure this store is visible to other CPUs */ + smp_wmb(); + __cpuc_flush_dcache_area(virt, sizeof(u32)); +} + +static int axxia_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + struct device_node *syscon_np; + void __iomem *syscon; + u32 tmp; + + syscon_np = of_find_compatible_node(NULL, NULL, "lsi,axxia-syscon"); + if (!syscon_np) + return -ENOENT; + + syscon = of_iomap(syscon_np, 0); + if (!syscon) + return -ENOMEM; + + tmp = readl(syscon + SC_RST_CPU_HOLD); + writel(0xab, syscon + SC_CRIT_WRITE_KEY); + tmp &= ~(1 << cpu); + writel(tmp, syscon + SC_RST_CPU_HOLD); + + return 0; +} + +static void __init axxia_smp_prepare_cpus(unsigned int max_cpus) +{ + int cpu_count = 0; + int cpu; + + /* + * Initialise the present map, which describes the set of CPUs actually + * populated at the present time. + */ + for_each_possible_cpu(cpu) { + struct device_node *np; + u32 release_phys; + + np = of_get_cpu_node(cpu, NULL); + if (!np) + continue; + if (of_property_read_u32(np, "cpu-release-addr", &release_phys)) + continue; + + if (cpu_count < max_cpus) { + set_cpu_present(cpu, true); + cpu_count++; + } + + if (release_phys != 0) + write_release_addr(release_phys); + } +} + +static const struct smp_operations axxia_smp_ops __initconst = { + .smp_prepare_cpus = axxia_smp_prepare_cpus, + .smp_boot_secondary = axxia_boot_secondary, +}; +CPU_METHOD_OF_DECLARE(axxia_smp, "lsi,syscon-release", &axxia_smp_ops); |