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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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70678554c4
The actions SMP implementation has several issues: 1. pen_release is only ever read and compared to -1, and is defined in arch/arm/kernel/smp.c to be -1. This test will always succeed. 2. we are already guaranteed to be single threaded while bringing up a CPU, so the spinlock makes no sense, remove it. 3. owl_secondary_startup() is not referenced nor defined, the prototype is redundant, remove it. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/*
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* Actions Semi Leopard
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*
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* This file is based on arm realview smp platform.
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*
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* Copyright 2012 Actions Semi Inc.
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* Author: Actions Semi, Inc.
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*
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* Copyright (c) 2017 Andreas Färber
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/smp.h>
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#include <linux/soc/actions/owl-sps.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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#define OWL_CPU1_ADDR 0x50
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#define OWL_CPU1_FLAG 0x5c
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#define OWL_CPUx_FLAG_BOOT 0x55aa
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#define OWL_SPS_PG_CTL_PWR_CPU2 BIT(5)
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#define OWL_SPS_PG_CTL_PWR_CPU3 BIT(6)
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#define OWL_SPS_PG_CTL_ACK_CPU2 BIT(21)
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#define OWL_SPS_PG_CTL_ACK_CPU3 BIT(22)
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static void __iomem *scu_base_addr;
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static void __iomem *sps_base_addr;
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static void __iomem *timer_base_addr;
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static int ncores;
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static int s500_wakeup_secondary(unsigned int cpu)
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{
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int ret;
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if (cpu > 3)
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return -EINVAL;
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/* The generic PM domain driver is not available this early. */
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switch (cpu) {
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case 2:
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ret = owl_sps_set_pg(sps_base_addr,
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OWL_SPS_PG_CTL_PWR_CPU2,
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OWL_SPS_PG_CTL_ACK_CPU2, true);
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if (ret)
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return ret;
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break;
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case 3:
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ret = owl_sps_set_pg(sps_base_addr,
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OWL_SPS_PG_CTL_PWR_CPU3,
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OWL_SPS_PG_CTL_ACK_CPU3, true);
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if (ret)
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return ret;
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break;
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}
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/* wait for CPUx to run to WFE instruction */
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udelay(200);
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writel(__pa_symbol(secondary_startup),
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timer_base_addr + OWL_CPU1_ADDR + (cpu - 1) * 4);
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writel(OWL_CPUx_FLAG_BOOT,
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timer_base_addr + OWL_CPU1_FLAG + (cpu - 1) * 4);
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dsb_sev();
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mb();
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return 0;
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}
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static int s500_smp_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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int ret;
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ret = s500_wakeup_secondary(cpu);
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if (ret)
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return ret;
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udelay(10);
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smp_send_reschedule(cpu);
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writel(0, timer_base_addr + OWL_CPU1_ADDR + (cpu - 1) * 4);
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writel(0, timer_base_addr + OWL_CPU1_FLAG + (cpu - 1) * 4);
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return 0;
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}
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static void __init s500_smp_prepare_cpus(unsigned int max_cpus)
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{
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struct device_node *node;
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node = of_find_compatible_node(NULL, NULL, "actions,s500-timer");
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if (!node) {
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pr_err("%s: missing timer\n", __func__);
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return;
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}
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timer_base_addr = of_iomap(node, 0);
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if (!timer_base_addr) {
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pr_err("%s: could not map timer registers\n", __func__);
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return;
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}
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node = of_find_compatible_node(NULL, NULL, "actions,s500-sps");
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if (!node) {
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pr_err("%s: missing sps\n", __func__);
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return;
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}
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sps_base_addr = of_iomap(node, 0);
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if (!sps_base_addr) {
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pr_err("%s: could not map sps registers\n", __func__);
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return;
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}
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if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
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node = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
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if (!node) {
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pr_err("%s: missing scu\n", __func__);
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return;
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}
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scu_base_addr = of_iomap(node, 0);
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if (!scu_base_addr) {
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pr_err("%s: could not map scu registers\n", __func__);
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return;
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}
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/*
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* While the number of cpus is gathered from dt, also get the
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* number of cores from the scu to verify this value when
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* booting the cores.
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*/
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ncores = scu_get_core_count(scu_base_addr);
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pr_debug("%s: ncores %d\n", __func__, ncores);
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scu_enable(scu_base_addr);
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}
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}
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static const struct smp_operations s500_smp_ops __initconst = {
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.smp_prepare_cpus = s500_smp_prepare_cpus,
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.smp_boot_secondary = s500_smp_boot_secondary,
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};
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CPU_METHOD_OF_DECLARE(s500_smp, "actions,s500-smp", &s500_smp_ops);
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