76 lines
1.9 KiB
C
76 lines
1.9 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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#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 <asm/smp_plat.h>
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static void __iomem *pmsu_mp_base;
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static void __iomem *pmsu_reset_base;
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#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24)
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#define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8)
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static struct of_device_id of_pmsu_table[] = {
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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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#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 reg, hw_cpu;
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if (!pmsu_mp_base || !pmsu_reset_base) {
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pr_warn("Can't boot CPU. PMSU is uninitialized\n");
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return 1;
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}
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hw_cpu = cpu_logical_map(cpu_id);
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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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/* Release CPU from reset by clearing reset bit*/
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reg = readl(pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu));
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reg &= (~0x1);
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writel(reg, pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu));
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return 0;
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}
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#endif
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int __init armada_370_xp_pmsu_init(void)
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{
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struct device_node *np;
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np = of_find_matching_node(NULL, of_pmsu_table);
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if (np) {
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pr_info("Initializing Power Management Service Unit\n");
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pmsu_mp_base = of_iomap(np, 0);
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pmsu_reset_base = of_iomap(np, 1);
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}
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return 0;
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}
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early_initcall(armada_370_xp_pmsu_init);
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