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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2015, Siemens AG
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* Author: Jan Kiszka <jan.kiszka@siemens.com>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/psci.h>
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#include <asm/arch/flow.h>
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#include <asm/arch/powergate.h>
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#include <asm/arch-tegra/ap.h>
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#include <asm/arch-tegra/pmc.h>
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static void park_cpu(void)
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{
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while (1)
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asm volatile("wfi");
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}
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/**
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* Initialize power management for application processors
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*/
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void psci_board_init(void)
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{
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struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
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writel((u32)park_cpu, EXCEP_VECTOR_CPU_RESET_VECTOR);
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/*
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* The naturally expected order of putting these CPUs under Flow
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* Controller regime would be
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* - configure the Flow Controller
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* - power up the CPUs
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* - wait for the CPUs to hit wfi and be powered down again
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*
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* However, this doesn't work in practice. We rather need to power them
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* up first and park them in wfi. While they are waiting there, we can
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* indeed program the Flow Controller to powergate them on wfi, which
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* will then happen immediately as they are already in that state.
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*/
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tegra_powergate_power_on(TEGRA_POWERGATE_CPU1);
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tegra_powergate_power_on(TEGRA_POWERGATE_CPU2);
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tegra_powergate_power_on(TEGRA_POWERGATE_CPU3);
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writel((2 << CSR_WAIT_WFI_SHIFT) | CSR_ENABLE, &flow->cpu1_csr);
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writel((4 << CSR_WAIT_WFI_SHIFT) | CSR_ENABLE, &flow->cpu2_csr);
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writel((8 << CSR_WAIT_WFI_SHIFT) | CSR_ENABLE, &flow->cpu3_csr);
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writel(EVENT_MODE_STOP, &flow->halt_cpu1_events);
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writel(EVENT_MODE_STOP, &flow->halt_cpu2_events);
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writel(EVENT_MODE_STOP, &flow->halt_cpu3_events);
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while (!(readl(&flow->cpu1_csr) & CSR_PWR_OFF_STS) ||
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!(readl(&flow->cpu2_csr) & CSR_PWR_OFF_STS) ||
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!(readl(&flow->cpu3_csr) & CSR_PWR_OFF_STS))
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/* wait */;
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}
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