02e7b06795
Setting the start (or boot) address of a CPU is no more used only during SMP bring up on Armada 370/XP, but it will also be used by the CPU idle function of Armada XP, and by the Armada 38x SMP support. Therefore this commit creates a separate PMSU function to set the boot address of a CPU with the PMSU. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Link: https://lkml.kernel.org/r/1397483433-25836-7-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1397483433-25836-7-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
/*
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* Power Management Service Unit(PMSU) support for Armada 370/XP platforms.
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*
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* Copyright (C) 2012 Marvell
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*
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* Yehuda Yitschak <yehuday@marvell.com>
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* Gregory Clement <gregory.clement@free-electrons.com>
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*
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* The Armada 370 and Armada XP SOCs have a power management service
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* unit which is responsible for powering down and waking up CPUs and
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* other SOC units
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*/
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#define pr_fmt(fmt) "mvebu-pmsu: " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include <linux/smp.h>
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#include <linux/resource.h>
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#include <asm/smp_plat.h>
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#include "common.h"
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#include "pmsu.h"
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static void __iomem *pmsu_mp_base;
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#define PMSU_BASE_OFFSET 0x100
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#define PMSU_REG_SIZE 0x1000
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#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124)
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static struct of_device_id of_pmsu_table[] = {
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{ .compatible = "marvell,armada-370-pmsu", },
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{ .compatible = "marvell,armada-370-xp-pmsu", },
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{ /* end of list */ },
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};
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static void mvebu_pmsu_set_cpu_boot_addr(int hw_cpu, void *boot_addr)
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{
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writel(virt_to_phys(boot_addr), pmsu_mp_base +
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PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu));
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}
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#ifdef CONFIG_SMP
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int armada_xp_boot_cpu(unsigned int cpu_id, void *boot_addr)
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{
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int hw_cpu, ret;
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if (!pmsu_mp_base) {
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pr_warn("Can't boot CPU. PMSU is uninitialized\n");
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return -ENODEV;
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}
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hw_cpu = cpu_logical_map(cpu_id);
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mvebu_pmsu_set_cpu_boot_addr(hw_cpu, boot_addr);
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ret = mvebu_cpu_reset_deassert(hw_cpu);
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if (ret) {
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pr_warn("unable to boot CPU: %d\n", ret);
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return ret;
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}
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return 0;
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}
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#endif
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static int __init armada_370_xp_pmsu_init(void)
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{
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struct device_node *np;
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struct resource res;
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int ret = 0;
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np = of_find_matching_node(NULL, of_pmsu_table);
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if (!np)
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return 0;
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pr_info("Initializing Power Management Service Unit\n");
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if (of_address_to_resource(np, 0, &res)) {
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pr_err("unable to get resource\n");
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ret = -ENOENT;
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goto out;
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}
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if (of_device_is_compatible(np, "marvell,armada-370-xp-pmsu")) {
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pr_warn(FW_WARN "deprecated pmsu binding\n");
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res.start = res.start - PMSU_BASE_OFFSET;
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res.end = res.start + PMSU_REG_SIZE - 1;
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}
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if (!request_mem_region(res.start, resource_size(&res),
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np->full_name)) {
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pr_err("unable to request region\n");
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ret = -EBUSY;
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goto out;
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}
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pmsu_mp_base = ioremap(res.start, resource_size(&res));
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if (!pmsu_mp_base) {
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pr_err("unable to map registers\n");
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release_mem_region(res.start, resource_size(&res));
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ret = -ENOMEM;
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goto out;
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}
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out:
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of_node_put(np);
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return ret;
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}
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early_initcall(armada_370_xp_pmsu_init);
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