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a9ff696160
Making virt_to_pfn() a static inline taking a strongly typed (const void *) makes the contract of a passing a pointer of that type to the function explicit and exposes any misuse of the macro virt_to_pfn() acting polymorphic and accepting many types such as (void *), (unitptr_t) or (unsigned long) as arguments without warnings. Doing this is a bit intrusive: virt_to_pfn() requires PHYS_PFN_OFFSET and PAGE_SHIFT to be defined, and this is defined in <asm/page.h>, so this must be included *before* <asm/memory.h>. The use of macros were obscuring the unclear inclusion order here, as the macros would eventually be resolved, but a static inline like this cannot be compiled with unresolved macros. The naive solution to include <asm/page.h> at the top of <asm/memory.h> does not work, because <asm/memory.h> sometimes includes <asm/page.h> at the end of itself, which would create a confusing inclusion loop. So instead, take the approach to always unconditionally include <asm/page.h> at the end of <asm/memory.h> arch/arm uses <asm/memory.h> explicitly in a lot of places, however it turns out that if we just unconditionally include <asm/memory.h> into <asm/page.h> and switch all inclusions of <asm/memory.h> to <asm/page.h> instead, we enforce the right order and <asm/memory.h> will always have access to the definitions. Put an inclusion guard in place making it impossible to include <asm/memory.h> explicitly. Link: https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2014 Marvell Technology Group Ltd.
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*
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* Antoine Ténart <antoine.tenart@free-electrons.com>
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*/
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <asm/cacheflush.h>
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#include <asm/cp15.h>
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#include <asm/page.h>
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#include <asm/smp_plat.h>
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#include <asm/smp_scu.h>
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/*
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* There are two reset registers, one with self-clearing (SC)
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* reset and one with non-self-clearing reset (NON_SC).
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*/
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#define CPU_RESET_SC 0x00
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#define CPU_RESET_NON_SC 0x20
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#define RESET_VECT 0x00
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#define SW_RESET_ADDR 0x94
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extern u32 boot_inst;
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static void __iomem *cpu_ctrl;
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static inline void berlin_perform_reset_cpu(unsigned int cpu)
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{
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u32 val;
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val = readl(cpu_ctrl + CPU_RESET_NON_SC);
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val &= ~BIT(cpu_logical_map(cpu));
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writel(val, cpu_ctrl + CPU_RESET_NON_SC);
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val |= BIT(cpu_logical_map(cpu));
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writel(val, cpu_ctrl + CPU_RESET_NON_SC);
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}
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static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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if (!cpu_ctrl)
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return -EFAULT;
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/*
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* Reset the CPU, making it to execute the instruction in the reset
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* exception vector.
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*/
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berlin_perform_reset_cpu(cpu);
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return 0;
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}
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static void __init berlin_smp_prepare_cpus(unsigned int max_cpus)
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{
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struct device_node *np;
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void __iomem *scu_base;
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void __iomem *vectors_base;
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np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
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scu_base = of_iomap(np, 0);
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of_node_put(np);
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if (!scu_base)
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return;
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np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl");
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cpu_ctrl = of_iomap(np, 0);
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of_node_put(np);
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if (!cpu_ctrl)
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goto unmap_scu;
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vectors_base = ioremap(VECTORS_BASE, SZ_32K);
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if (!vectors_base)
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goto unmap_scu;
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scu_enable(scu_base);
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/*
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* Write the first instruction the CPU will execute after being reset
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* in the reset exception vector.
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*/
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writel(boot_inst, vectors_base + RESET_VECT);
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/*
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* Write the secondary startup address into the SW reset address
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* vector. This is used by boot_inst.
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*/
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writel(__pa_symbol(secondary_startup), vectors_base + SW_RESET_ADDR);
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iounmap(vectors_base);
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unmap_scu:
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iounmap(scu_base);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void berlin_cpu_die(unsigned int cpu)
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{
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v7_exit_coherency_flush(louis);
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while (1)
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cpu_do_idle();
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}
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static int berlin_cpu_kill(unsigned int cpu)
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{
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u32 val;
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val = readl(cpu_ctrl + CPU_RESET_NON_SC);
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val &= ~BIT(cpu_logical_map(cpu));
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writel(val, cpu_ctrl + CPU_RESET_NON_SC);
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return 1;
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}
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#endif
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static const struct smp_operations berlin_smp_ops __initconst = {
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.smp_prepare_cpus = berlin_smp_prepare_cpus,
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.smp_boot_secondary = berlin_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = berlin_cpu_die,
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.cpu_kill = berlin_cpu_kill,
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#endif
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};
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CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops);
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