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46 lines
2 KiB
C++
46 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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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 <exosphere.hpp>
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#include "warmboot_clkrst.hpp"
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namespace ams::warmboot {
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namespace {
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constexpr inline const uintptr_t CLKRST = secmon::MemoryRegionPhysicalDeviceClkRst.GetAddress();
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constexpr inline const uintptr_t PMC = secmon::MemoryRegionPhysicalDevicePmc.GetAddress();
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constexpr inline const uintptr_t TIMER = secmon::MemoryRegionPhysicalDeviceTimer.GetAddress();
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}
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void ConfigureOscillators() {
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/* Enable the crystal oscillator, and copy the drive strength from pmc. */
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const auto xofs = reg::GetValue(PMC + APBDEV_PMC_OSC_EDPD_OVER, PMC_REG_BITS_MASK(OSC_EDPD_OVER_XOFS));
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reg::ReadWrite(CLKRST + CLK_RST_CONTROLLER_OSC_CTRL, CLK_RST_REG_BITS_ENUM (OSC_CTRL_XOE, ENABLE),
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CLK_RST_REG_BITS_VALUE(OSC_CTRL_XOFS, xofs));
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/* Configure CLK_M_DIVISOR to 2. */
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reg::Write(CLKRST + CLK_RST_CONTROLLER_SPARE_REG0, CLK_RST_REG_BITS_ENUM(SPARE_REG0_CLK_M_DIVISOR, CLK_M_DIVISOR2));
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reg::Read(CLKRST + CLK_RST_CONTROLLER_SPARE_REG0);
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/* Restore TIMERUS config to 19.2 MHz. */
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reg::Write(TIMER + TIMERUS_USEC_CFG, TIMER_REG_BITS_VALUE(USEC_CFG_USEC_DIVIDEND, 5 - 1),
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TIMER_REG_BITS_VALUE(USEC_CFG_USEC_DIVISOR, 96 - 1));
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}
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}
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