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163 lines
3.9 KiB
163 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This file contains Xilinx specific SMP code, used to start up |
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* the second processor. |
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* |
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* Copyright (C) 2011-2013 Xilinx |
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* |
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* based on linux/arch/arm/mach-realview/platsmp.c |
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* |
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* Copyright (C) 2002 ARM Ltd. |
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*/ |
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#include <linux/export.h> |
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#include <linux/jiffies.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <asm/cacheflush.h> |
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#include <asm/smp_plat.h> |
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#include <asm/smp_scu.h> |
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#include <linux/irqchip/arm-gic.h> |
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#include "common.h" |
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/* |
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* Store number of cores in the system |
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* Because of scu_get_core_count() must be in __init section and can't |
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* be called from zynq_cpun_start() because it is not in __init section. |
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*/ |
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static int ncores; |
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int zynq_cpun_start(u32 address, int cpu) |
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{ |
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u32 trampoline_code_size = &zynq_secondary_trampoline_end - |
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&zynq_secondary_trampoline; |
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u32 phy_cpuid = cpu_logical_map(cpu); |
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/* MS: Expectation that SLCR are directly map and accessible */ |
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/* Not possible to jump to non aligned address */ |
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if (!(address & 3) && (!address || (address >= trampoline_code_size))) { |
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/* Store pointer to ioremap area which points to address 0x0 */ |
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static u8 __iomem *zero; |
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u32 trampoline_size = &zynq_secondary_trampoline_jump - |
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&zynq_secondary_trampoline; |
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zynq_slcr_cpu_stop(phy_cpuid); |
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if (address) { |
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if (__pa(PAGE_OFFSET)) { |
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zero = ioremap(0, trampoline_code_size); |
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if (!zero) { |
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pr_warn("BOOTUP jump vectors not accessible\n"); |
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return -1; |
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} |
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} else { |
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zero = (__force u8 __iomem *)PAGE_OFFSET; |
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} |
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/* |
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* This is elegant way how to jump to any address |
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* 0x0: Load address at 0x8 to r0 |
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* 0x4: Jump by mov instruction |
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* 0x8: Jumping address |
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*/ |
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memcpy_toio(zero, &zynq_secondary_trampoline, |
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trampoline_size); |
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writel(address, zero + trampoline_size); |
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flush_cache_all(); |
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outer_flush_range(0, trampoline_code_size); |
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smp_wmb(); |
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if (__pa(PAGE_OFFSET)) |
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iounmap(zero); |
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} |
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zynq_slcr_cpu_start(phy_cpuid); |
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return 0; |
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} |
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pr_warn("Can't start CPU%d: Wrong starting address %x\n", cpu, address); |
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return -1; |
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} |
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EXPORT_SYMBOL(zynq_cpun_start); |
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static int zynq_boot_secondary(unsigned int cpu, struct task_struct *idle) |
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{ |
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return zynq_cpun_start(__pa_symbol(secondary_startup_arm), cpu); |
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} |
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/* |
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* Initialise the CPU possible map early - this describes the CPUs |
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* which may be present or become present in the system. |
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*/ |
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static void __init zynq_smp_init_cpus(void) |
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{ |
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int i; |
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ncores = scu_get_core_count(zynq_scu_base); |
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for (i = 0; i < ncores && i < CONFIG_NR_CPUS; i++) |
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set_cpu_possible(i, true); |
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} |
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static void __init zynq_smp_prepare_cpus(unsigned int max_cpus) |
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{ |
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scu_enable(zynq_scu_base); |
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} |
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/** |
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* zynq_secondary_init - Initialize secondary CPU cores |
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* @cpu: CPU that is initialized |
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* |
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* This function is in the hotplug path. Don't move it into the |
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* init section!! |
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*/ |
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static void zynq_secondary_init(unsigned int cpu) |
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{ |
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zynq_core_pm_init(); |
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} |
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#ifdef CONFIG_HOTPLUG_CPU |
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static int zynq_cpu_kill(unsigned cpu) |
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{ |
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unsigned long timeout = jiffies + msecs_to_jiffies(50); |
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while (zynq_slcr_cpu_state_read(cpu)) |
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if (time_after(jiffies, timeout)) |
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return 0; |
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zynq_slcr_cpu_stop(cpu); |
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return 1; |
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} |
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/** |
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* zynq_cpu_die - Let a CPU core die |
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* @cpu: Dying CPU |
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* |
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* Platform-specific code to shutdown a CPU. |
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* Called with IRQs disabled on the dying CPU. |
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*/ |
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static void zynq_cpu_die(unsigned int cpu) |
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{ |
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zynq_slcr_cpu_state_write(cpu, true); |
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/* |
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* there is no power-control hardware on this platform, so all |
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* we can do is put the core into WFI; this is safe as the calling |
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* code will have already disabled interrupts |
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*/ |
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for (;;) |
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cpu_do_idle(); |
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} |
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#endif |
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const struct smp_operations zynq_smp_ops __initconst = { |
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.smp_init_cpus = zynq_smp_init_cpus, |
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.smp_prepare_cpus = zynq_smp_prepare_cpus, |
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.smp_boot_secondary = zynq_boot_secondary, |
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.smp_secondary_init = zynq_secondary_init, |
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#ifdef CONFIG_HOTPLUG_CPU |
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.cpu_die = zynq_cpu_die, |
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.cpu_kill = zynq_cpu_kill, |
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#endif |
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};
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