diff options
| -rw-r--r-- | arch/arm/mach-uniphier/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mach-uniphier/headsmp.S | 43 | ||||
| -rw-r--r-- | arch/arm/mach-uniphier/platsmp.c | 185 |
3 files changed, 199 insertions, 31 deletions
diff --git a/arch/arm/mach-uniphier/Makefile b/arch/arm/mach-uniphier/Makefile index 60bd226..1233f9b 100644 --- a/arch/arm/mach-uniphier/Makefile +++ b/arch/arm/mach-uniphier/Makefile @@ -1,2 +1,2 @@ obj-y := uniphier.o -obj-$(CONFIG_SMP) += platsmp.o +obj-$(CONFIG_SMP) += platsmp.o headsmp.o diff --git a/arch/arm/mach-uniphier/headsmp.S b/arch/arm/mach-uniphier/headsmp.S new file mode 100644 index 0000000..c819dff --- /dev/null +++ b/arch/arm/mach-uniphier/headsmp.S @@ -0,0 +1,43 @@ +/* + * 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. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/cp15.h> + +ENTRY(uniphier_smp_trampoline) +ARM_BE8(setend be) @ ensure we are in BE8 mode + mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Reg) + and r2, r0, #0x3 @ CPU ID + ldr r1, uniphier_smp_trampoline_jump + ldr r3, uniphier_smp_trampoline_poll_addr + mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register) + orr r0, r0, #CR_I @ Enable ICache + bic r0, r0, #(CR_C | CR_M) @ Disable MMU and Dcache + mcr p15, 0, r0, c1, c0, 0 + b 1f @ cache the following 5 instructions +0: wfe +1: ldr r0, [r3] + cmp r0, r2 + bxeq r1 @ branch to secondary_startup + b 0b + .globl uniphier_smp_trampoline_jump +uniphier_smp_trampoline_jump: + .word 0 @ set virt_to_phys(secondary_startup) + .globl uniphier_smp_trampoline_poll_addr +uniphier_smp_trampoline_poll_addr: + .word 0 @ set CPU ID to be kicked to this reg + .globl uniphier_smp_trampoline_end +uniphier_smp_trampoline_end: +ENDPROC(uniphier_smp_trampoline) diff --git a/arch/arm/mach-uniphier/platsmp.c b/arch/arm/mach-uniphier/platsmp.c index 4b784f7..f057766 100644 --- a/arch/arm/mach-uniphier/platsmp.c +++ b/arch/arm/mach-uniphier/platsmp.c @@ -12,73 +12,198 @@ * GNU General Public License for more details. */ -#include <linux/sizes.h> -#include <linux/compiler.h> +#define pr_fmt(fmt) "uniphier: " fmt + #include <linux/init.h> #include <linux/io.h> -#include <linux/regmap.h> -#include <linux/mfd/syscon.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> -static struct regmap *sbcm_regmap; +/* + * 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_SBC_ROM_BOOT_RSV2 0x1208 -static void __init uniphier_smp_prepare_cpus(unsigned int max_cpus) +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) { - static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 }; - unsigned long scu_base_phys = 0; - void __iomem *scu_base; + size_t trmp_size; + static void __iomem *trmp_base; - sbcm_regmap = syscon_regmap_lookup_by_compatible( - "socionext,uniphier-system-bus-controller-misc"); - if (IS_ERR(sbcm_regmap)) { - pr_err("failed to regmap system-bus-controller-misc\n"); - goto err; + 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-system-bus-controller"); + ret = of_address_to_resource(np, 1, &res); + if (ret) { + pr_err("failed to get resource of system-bus-controller\n"); + return ret; + } + + rom_rsv2_phys = res.start + UNIPHIER_SBC_ROM_BOOT_RSV2; + + ret = uniphier_smp_copy_trampoline(rom_rsv2_phys); + if (ret) + return ret; + + uniphier_smp_rom_boot_rsv2 = ioremap(rom_rsv2_phys, sizeof(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"); - goto err; + return -ENODEV; } scu_base = ioremap(scu_base_phys, SZ_128); if (!scu_base) { - pr_err("failed to remap scu base (0x%08lx)\n", scu_base_phys); - goto err; + 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); - sbcm_regmap = NULL; + uniphier_smp_unprepare_trampoline(); } -static int uniphier_boot_secondary(unsigned int cpu, - struct task_struct *idle) +static int __init uniphier_smp_boot_secondary(unsigned int cpu, + struct task_struct *idle) { - int ret; + if (WARN_ON_ONCE(!uniphier_smp_rom_boot_rsv2)) + return -EFAULT; - if (!sbcm_regmap) - return -ENODEV; + writel(cpu, uniphier_smp_rom_boot_rsv2); + readl(uniphier_smp_rom_boot_rsv2); /* relax */ - ret = regmap_write(sbcm_regmap, 0x1208, - virt_to_phys(secondary_startup)); - if (!ret) - asm("sev"); /* wake up secondary CPU */ + 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 ret; + return 0; } -struct smp_operations uniphier_smp_ops __initdata = { +static struct smp_operations uniphier_smp_ops __initdata = { .smp_prepare_cpus = uniphier_smp_prepare_cpus, - .smp_boot_secondary = uniphier_boot_secondary, + .smp_boot_secondary = uniphier_smp_boot_secondary, }; CPU_METHOD_OF_DECLARE(uniphier_smp, "socionext,uniphier-smp", &uniphier_smp_ops); |
