diff options
Diffstat (limited to 'arch/arm/mach-uniphier/platsmp.c')
| -rw-r--r-- | arch/arm/mach-uniphier/platsmp.c | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/arch/arm/mach-uniphier/platsmp.c b/arch/arm/mach-uniphier/platsmp.c deleted file mode 100644 index 9978c41128f6..000000000000 --- a/arch/arm/mach-uniphier/platsmp.c +++ /dev/null @@ -1,209 +0,0 @@ -/* - * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> - * - * 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. - */ - -#define pr_fmt(fmt) "uniphier: " fmt - -#include <linux/init.h> -#include <linux/io.h> -#include <linux/ioport.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/sizes.h> -#include <asm/cacheflush.h> -#include <asm/hardware/cache-uniphier.h> -#include <asm/pgtable.h> -#include <asm/smp.h> -#include <asm/smp_scu.h> - -/* - * The secondary CPUs check this register from the boot ROM for the jump - * destination. After that, it can be reused as a scratch register. - */ -#define UNIPHIER_SMPCTRL_ROM_RSV2 0x208 - -static void __iomem *uniphier_smp_rom_boot_rsv2; -static unsigned int uniphier_smp_max_cpus; - -extern char uniphier_smp_trampoline; -extern char uniphier_smp_trampoline_jump; -extern char uniphier_smp_trampoline_poll_addr; -extern char uniphier_smp_trampoline_end; - -/* - * Copy trampoline code to the tail of the 1st section of the page table used - * in the boot ROM. This area is directly accessible by the secondary CPUs - * for all the UniPhier SoCs. - */ -static const phys_addr_t uniphier_smp_trampoline_dest_end = SECTION_SIZE; -static phys_addr_t uniphier_smp_trampoline_dest; - -static int __init uniphier_smp_copy_trampoline(phys_addr_t poll_addr) -{ - size_t trmp_size; - static void __iomem *trmp_base; - - if (!uniphier_cache_l2_is_enabled()) { - pr_warn("outer cache is needed for SMP, but not enabled\n"); - return -ENODEV; - } - - uniphier_cache_l2_set_locked_ways(1); - - outer_flush_all(); - - trmp_size = &uniphier_smp_trampoline_end - &uniphier_smp_trampoline; - uniphier_smp_trampoline_dest = uniphier_smp_trampoline_dest_end - - trmp_size; - - uniphier_cache_l2_touch_range(uniphier_smp_trampoline_dest, - uniphier_smp_trampoline_dest_end); - - trmp_base = ioremap_cache(uniphier_smp_trampoline_dest, trmp_size); - if (!trmp_base) { - pr_err("failed to map trampoline destination area\n"); - return -ENOMEM; - } - - memcpy(trmp_base, &uniphier_smp_trampoline, trmp_size); - - writel(virt_to_phys(secondary_startup), - trmp_base + (&uniphier_smp_trampoline_jump - - &uniphier_smp_trampoline)); - - writel(poll_addr, trmp_base + (&uniphier_smp_trampoline_poll_addr - - &uniphier_smp_trampoline)); - - flush_cache_all(); /* flush out trampoline code to outer cache */ - - iounmap(trmp_base); - - return 0; -} - -static int __init uniphier_smp_prepare_trampoline(unsigned int max_cpus) -{ - struct device_node *np; - struct resource res; - phys_addr_t rom_rsv2_phys; - int ret; - - np = of_find_compatible_node(NULL, NULL, "socionext,uniphier-smpctrl"); - ret = of_address_to_resource(np, 0, &res); - of_node_put(np); - if (ret) { - pr_err("failed to get resource of SMP control\n"); - return ret; - } - - rom_rsv2_phys = res.start + UNIPHIER_SMPCTRL_ROM_RSV2; - - ret = uniphier_smp_copy_trampoline(rom_rsv2_phys); - if (ret) - return ret; - - uniphier_smp_rom_boot_rsv2 = ioremap(rom_rsv2_phys, SZ_4); - if (!uniphier_smp_rom_boot_rsv2) { - pr_err("failed to map ROM_BOOT_RSV2 register\n"); - return -ENOMEM; - } - - writel(uniphier_smp_trampoline_dest, uniphier_smp_rom_boot_rsv2); - asm("sev"); /* Bring up all secondary CPUs to the trampoline code */ - - uniphier_smp_max_cpus = max_cpus; /* save for later use */ - - return 0; -} - -static void __init uniphier_smp_unprepare_trampoline(void) -{ - iounmap(uniphier_smp_rom_boot_rsv2); - - if (uniphier_smp_trampoline_dest) - outer_inv_range(uniphier_smp_trampoline_dest, - uniphier_smp_trampoline_dest_end); - - uniphier_cache_l2_set_locked_ways(0); -} - -static int __init uniphier_smp_enable_scu(void) -{ - unsigned long scu_base_phys = 0; - void __iomem *scu_base; - - if (scu_a9_has_base()) - scu_base_phys = scu_a9_get_base(); - - if (!scu_base_phys) { - pr_err("failed to get scu base\n"); - return -ENODEV; - } - - scu_base = ioremap(scu_base_phys, SZ_128); - if (!scu_base) { - pr_err("failed to map scu base\n"); - return -ENOMEM; - } - - scu_enable(scu_base); - iounmap(scu_base); - - return 0; -} - -static void __init uniphier_smp_prepare_cpus(unsigned int max_cpus) -{ - static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 }; - int ret; - - ret = uniphier_smp_prepare_trampoline(max_cpus); - if (ret) - goto err; - - ret = uniphier_smp_enable_scu(); - if (ret) - goto err; - - return; -err: - pr_warn("disabling SMP\n"); - init_cpu_present(&only_cpu_0); - uniphier_smp_unprepare_trampoline(); -} - -static int __init uniphier_smp_boot_secondary(unsigned int cpu, - struct task_struct *idle) -{ - if (WARN_ON_ONCE(!uniphier_smp_rom_boot_rsv2)) - return -EFAULT; - - writel(cpu, uniphier_smp_rom_boot_rsv2); - readl(uniphier_smp_rom_boot_rsv2); /* relax */ - - asm("sev"); /* wake up secondary CPUs sleeping in the trampoline */ - - if (cpu == uniphier_smp_max_cpus - 1) { - /* clean up resources if this is the last CPU */ - uniphier_smp_unprepare_trampoline(); - } - - return 0; -} - -static const struct smp_operations uniphier_smp_ops __initconst = { - .smp_prepare_cpus = uniphier_smp_prepare_cpus, - .smp_boot_secondary = uniphier_smp_boot_secondary, -}; -CPU_METHOD_OF_DECLARE(uniphier_smp, "socionext,uniphier-smp", - &uniphier_smp_ops); |