mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-08 19:23:56 +09:00
1b245fee91
This provides SPL support for T30 boards - AVP early init, plus CPU (A9) init/jump to main U-Boot. Some changes were made to Tegra20 cpu.c to move common routines into tegra-common/cpu.c and reduce code duplication. Signed-off-by: Tom Warren <twarren@nvidia.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Acked-by: Simon Glass <sjg@chromium.org>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
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* Copyright (c) 2010-2012, NVIDIA CORPORATION. All rights reserved.
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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/arch/tegra.h>
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#include <asm/arch-tegra/pmc.h>
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#include "../tegra-common/cpu.h"
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static void enable_cpu_power_rail(void)
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{
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struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
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u32 reg;
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reg = readl(&pmc->pmc_cntrl);
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reg |= CPUPWRREQ_OE;
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writel(reg, &pmc->pmc_cntrl);
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/*
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* The TI PMU65861C needs a 3.75ms delay between enabling
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* the power rail and enabling the CPU clock. This delay
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* between SM1EN and SM1 is for switching time + the ramp
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* up of the voltage to the CPU (VDD_CPU from PMU).
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*/
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udelay(3750);
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}
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void start_cpu(u32 reset_vector)
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{
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/* Enable VDD_CPU */
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enable_cpu_power_rail();
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/* Hold the CPUs in reset */
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reset_A9_cpu(1);
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/* Disable the CPU clock */
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enable_cpu_clock(0);
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/* Enable CoreSight */
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clock_enable_coresight(1);
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/*
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* Set the entry point for CPU execution from reset,
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* if it's a non-zero value.
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*/
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if (reset_vector)
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writel(reset_vector, EXCEP_VECTOR_CPU_RESET_VECTOR);
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/* Enable the CPU clock */
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enable_cpu_clock(1);
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/* If the CPU doesn't already have power, power it up */
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powerup_cpu();
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/* Take the CPU out of reset */
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reset_A9_cpu(0);
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}
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