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Atmosphere/exosphere/program/sc7fw/source/sc7fw_dram.cpp

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <exosphere.hpp>
#include "sc7fw_util.hpp"
#include "sc7fw_dram.hpp"
namespace ams::sc7fw {
namespace {
constexpr inline const uintptr_t PMC = secmon::MemoryRegionPhysicalDevicePmc.GetAddress();
void UpdateEmcTiming() {
/* Enable timing update. */
reg::Write(EMC_ADDRESS(EMC_TIMING_CONTROL), EMC_REG_BITS_ENUM(TIMING_CONTROL_TIMING_UPDATE, ENABLED));
/* Wait for the timing update to complete. */
while (!reg::HasValue(EMC_ADDRESS(EMC_EMC_STATUS), EMC_REG_BITS_ENUM(EMC_STATUS_TIMING_UPDATE_STALLED, DONE))) {
/* ... */
}
}
void RequestAllPadsPowerDown(uintptr_t addr, uintptr_t expected) {
constexpr u32 DpdAllRequestValue = reg::Encode(PMC_REG_BITS_ENUM(IO_DPD_REQ_CODE, DPD_ON)) | 0x0FFFFFFF;
const auto RequestAddress = addr;
const auto StatusAddress = addr + 4;
/* Request all pads enter power down. */
reg::Write(PMC + RequestAddress, DpdAllRequestValue);
/* Wait until the status reflects our expectation (and all pads are shut down). */
while (reg::Read(PMC + StatusAddress) != expected) { /* ... */ }
/* Wait a little while to allow the power down status to propagate. */
SpinLoop(0x20);
};
}
void SaveEmcFsp() {
/* We require that the RAM is LPDDR4. */
AMS_ABORT_UNLESS(reg::HasValue(EMC_ADDRESS(EMC_FBIO_CFG5), EMC_REG_BITS_ENUM(FBIO_CFG5_DRAM_TYPE, LPDDR4)));
/* Read the frequency set points from MRW3. */
constexpr u32 FspShift = 6;
constexpr u32 FspBits = 2;
constexpr u32 FspMask = ((1u << FspBits) - 1) << FspShift;
static_assert(FspMask == 0x000000C0);
const u32 fsp = (reg::Read(EMC_ADDRESS(EMC_MRW3)) & FspMask) >> FspShift;
/* Write the fsp to PMC_SCRATCH18, where it will be restored to MRW3 by brom. */
reg::ReadWrite(PMC + APBDEV_PMC_SCRATCH18, REG_BITS_VALUE(FspShift, FspBits, fsp));
/* Write the fsp twice to PMC_SCRATCH12, where it will be restored to MRW12 by brom. */
reg::ReadWrite(PMC + APBDEV_PMC_SCRATCH12, REG_BITS_VALUE(FspShift, FspBits, fsp), REG_BITS_VALUE(FspShift + 8, FspBits, fsp));
/* Write the fsp twice to PMC_SCRATCH13, where it will be restored to MRW13 by brom. */
reg::ReadWrite(PMC + APBDEV_PMC_SCRATCH13, REG_BITS_VALUE(FspShift, FspBits, fsp), REG_BITS_VALUE(FspShift + 8, FspBits, fsp));
}
void EnableSdramSelfRefresh() {
/* We require that the RAM is dual-channel. */
AMS_ABORT_UNLESS(reg::HasValue(EMC_ADDRESS(EMC_FBIO_CFG7), EMC_REG_BITS_ENUM(FBIO_CFG7_CH1_ENABLE, ENABLE)));
/* Disable RAM's ability to dynamically self-refresh, and to opportunistically perform powerdown. */
reg::Write(EMC_ADDRESS(EMC_CFG), EMC_REG_BITS_ENUM(CFG_DYN_SELF_REF, DISABLED),
EMC_REG_BITS_ENUM(CFG_DRAM_ACPD, NO_POWERDOWN));
/* Update the EMC timing. */
UpdateEmcTiming();
/* Wait five microseconds. */
util::WaitMicroSeconds(5);
/* Disable ZQ calibration. */
reg::Write(EMC_ADDRESS(EMC_ZCAL_INTERVAL), 0);
/* Disable automatic calibration. */
reg::Write(EMC_ADDRESS(EMC_AUTO_CAL_CONFIG), EMC_REG_BITS_ENUM(AUTO_CAL_CONFIG_AUTO_CAL_MEASURE_STALL, ENABLE),
EMC_REG_BITS_ENUM(AUTO_CAL_CONFIG_AUTO_CAL_UPDATE_STALL, ENABLE),
EMC_REG_BITS_ENUM(AUTO_CAL_CONFIG_AUTO_CAL_START, DISABLE));
/* Get whether digital delay locked loops are enabled. */
const bool has_dll = reg::HasValue(EMC_ADDRESS(EMC_CFG_DIG_DLL), EMC_REG_BITS_ENUM(CFG_DIG_DLL_CFG_DLL_EN, ENABLED));
if (has_dll) {
/* If they are, disable them. */
reg::ReadWrite(EMC_ADDRESS(EMC_CFG_DIG_DLL), EMC_REG_BITS_ENUM(CFG_DIG_DLL_CFG_DLL_EN, DISABLED));
}
/* Update the EMC timing. */
UpdateEmcTiming();
/* If dll was enabled, wait until both EMC0 and EMC1 have dll disabled. */
if (has_dll) {
while (!reg::HasValue(EMC0_ADDRESS(EMC_CFG_DIG_DLL), EMC_REG_BITS_ENUM(CFG_DIG_DLL_CFG_DLL_EN, DISABLED))) { /* ... */ }
while (!reg::HasValue(EMC1_ADDRESS(EMC_CFG_DIG_DLL), EMC_REG_BITS_ENUM(CFG_DIG_DLL_CFG_DLL_EN, DISABLED))) { /* ... */ }
}
/* Stall all reads and writes. */
reg::Write(EMC_ADDRESS(EMC_REQ_CTRL), EMC_REG_BITS_VALUE(REQ_CTRL_STALL_ALL_READS, 1),
EMC_REG_BITS_VALUE(REQ_CTRL_STALL_ALL_WRITES, 1));
/* Wait until both EMC0 and EMC1 have no outstanding transactions. */
while (!reg::HasValue(EMC0_ADDRESS(EMC_EMC_STATUS), EMC_REG_BITS_ENUM(EMC_STATUS_NO_OUTSTANDING_TRANSACTIONS, COMPLETED))) { /* ... */ }
while (!reg::HasValue(EMC1_ADDRESS(EMC_EMC_STATUS), EMC_REG_BITS_ENUM(EMC_STATUS_NO_OUTSTANDING_TRANSACTIONS, COMPLETED))) { /* ... */ }
/* Enable self-refresh. */
reg::Write(EMC_ADDRESS(EMC_SELF_REF), EMC_REG_BITS_ENUM(SELF_REF_SREF_DEV_SELECTN, BOTH),
EMC_REG_BITS_ENUM(SELF_REF_SELF_REF_CMD, ENABLED));
/* Wait until both EMC and EMC1 are in self-refresh. */
const auto desired = reg::HasValue(EMC_ADDRESS(EMC_ADR_CFG), EMC_REG_BITS_ENUM(ADR_CFG_EMEM_NUMDEV, N2)) ? EMC_REG_BITS_ENUM(EMC_STATUS_DRAM_IN_SELF_REFRESH, BOTH_ENABLED)
: EMC_REG_BITS_ENUM(EMC_STATUS_DRAM_DEV0_IN_SELF_REFRESH, ENABLED);
/* NOTE: Nintendo's sc7 entry firmware has a bug here. */
/* Instead of waiting for both EMCs to report self-refresh, they just read the EMC_STATUS for each EMC. */
/* This is incorrect, per documentation. */
while (!reg::HasValue(EMC0_ADDRESS(EMC_EMC_STATUS), desired)) { /* ... */ }
while (!reg::HasValue(EMC1_ADDRESS(EMC_EMC_STATUS), desired)) { /* ... */ }
}
void EnableEmcAllSegmentsRefresh() {
constexpr int MR17_PASR_Segment = 17;
/* Write zeros to MR17_PASR_Segment to enable refresh for all segments for dev0. */
reg::Write(EMC_ADDRESS(EMC_MRW), EMC_REG_BITS_ENUM (MRW_DEV_SELECTN, DEV0),
EMC_REG_BITS_ENUM (MRW_CNT, EXT1),
EMC_REG_BITS_VALUE(MRW_MA, MR17_PASR_Segment),
EMC_REG_BITS_VALUE(MRW_OP, 0));
/* If dev1 exists, do the same for dev1. */
if (reg::HasValue(EMC_ADDRESS(EMC_ADR_CFG), EMC_REG_BITS_ENUM(ADR_CFG_EMEM_NUMDEV, N2))) {
reg::Write(EMC_ADDRESS(EMC_MRW), EMC_REG_BITS_ENUM (MRW_DEV_SELECTN, DEV1),
EMC_REG_BITS_ENUM (MRW_CNT, EXT1),
EMC_REG_BITS_VALUE(MRW_MA, MR17_PASR_Segment),
EMC_REG_BITS_VALUE(MRW_OP, 0));
}
}
void EnableDdrDeepPowerDown() {
/* Read and decode the parameters Nintendo stores in EMC_PMC_SCRATCH3. */
const u32 scratch3 = reg::Read(EMC_ADDRESS(EMC_PMC_SCRATCH3));
const bool weak_bias = (scratch3 & reg::EncodeMask(EMC_REG_BITS_MASK(PMC_SCRATCH3_WEAK_BIAS))) == reg::EncodeValue(EMC_REG_BITS_ENUM(PMC_SCRATCH3_WEAK_BIAS, ENABLED));
const u32 ddr_cntrl = (scratch3 & reg::EncodeMask(EMC_REG_BITS_MASK(PMC_SCRATCH3_DDR_CNTRL)));
/* Write the decoded value to PMC_DDR_CNTRL. */
reg::Write(PMC + APBDEV_PMC_DDR_CNTRL, ddr_cntrl);
/* If weak bias is enabled, set all VTT_E_WB bits in APBDEV_PMC_WEAK_BIAS. */
if (weak_bias) {
constexpr u32 WeakBiasVttEWbAll = 0x7FFF0000;
reg::Write(PMC + APBDEV_PMC_WEAK_BIAS, WeakBiasVttEWbAll);
}
/* Request that DPD3 pads power down. */
constexpr u32 EristaDpd3Mask = 0x0FFFFFFF;
constexpr u32 MarikoDpd3Mask = 0x0FFF9FFF;
if (fuse::GetSocType() == fuse::SocType_Erista) {
RequestAllPadsPowerDown(APBDEV_PMC_IO_DPD3_REQ, EristaDpd3Mask);
} else {
RequestAllPadsPowerDown(APBDEV_PMC_IO_DPD3_REQ, MarikoDpd3Mask);
}
/* Request that DPD4 pads power down. */
constexpr u32 Dpd4Mask = 0x0FFF1FFF;
RequestAllPadsPowerDown(APBDEV_PMC_IO_DPD4_REQ, Dpd4Mask);
}
}
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