mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-09-20 07:08:59 +00:00
463 lines
17 KiB
C++
463 lines
17 KiB
C++
/*
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* Copyright (c) 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 <mesosphere.hpp>
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#include "kern_lps_driver.hpp"
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#include "kern_k_sleep_manager.hpp"
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#include "kern_bpmp_api.hpp"
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#include "kern_atomics_registers.hpp"
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#include "kern_ictlr_registers.hpp"
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#include "kern_sema_registers.hpp"
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namespace ams::kern::board::nintendo::nx::lps {
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namespace {
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constexpr inline int ChannelCount = 12;
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constexpr inline TimeSpan ChannelTimeout = TimeSpan::FromSeconds(1);
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constinit bool g_lps_init_done = false;
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constinit bool g_bpmp_connected = false;
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constinit bool g_bpmp_mail_initialized = false;
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constinit KSpinLock g_bpmp_mrq_lock;
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constinit KVirtualAddress g_evp_address = Null<KVirtualAddress>;
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constinit KVirtualAddress g_flow_address = Null<KVirtualAddress>;
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constinit KVirtualAddress g_prictlr_address = Null<KVirtualAddress>;
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constinit KVirtualAddress g_sema_address = Null<KVirtualAddress>;
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constinit KVirtualAddress g_atomics_address = Null<KVirtualAddress>;
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constinit KVirtualAddress g_clkrst_address = Null<KVirtualAddress>;
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constinit KVirtualAddress g_pmc_address = Null<KVirtualAddress>;
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constinit ChannelData g_channel_area[ChannelCount] = {};
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constinit u32 g_csite_clk_source = 0;
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ALWAYS_INLINE u32 Read(KVirtualAddress address) {
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return *GetPointer<volatile u32>(address);
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}
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ALWAYS_INLINE void Write(KVirtualAddress address, u32 value) {
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*GetPointer<volatile u32>(address) = value;
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}
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void InitializeDeviceVirtualAddresses() {
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/* Retrieve randomized mappings. */
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g_evp_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsExceptionVectors);
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g_flow_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsFlowController);
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g_prictlr_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsPrimaryICtlr);
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g_sema_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsSemaphore);
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g_atomics_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsAtomics);
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g_clkrst_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsClkRst);
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g_pmc_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_PowerManagementController);
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}
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/* NOTE: linux "do_cc4_init" */
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void ConfigureCc3AndCc4() {
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/* Configure CC4/CC3 as enabled with time threshold as 2 microseconds. */
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Write(g_flow_address + FLOW_CTLR_CC4_HVC_CONTROL, (0x2 << 3) | 0x1);
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/* Configure Retention with threshold 2 microseconds. */
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Write(g_flow_address + FLOW_CTLR_CC4_RETENTION_CONTROL, (0x2 << 3));
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/* Configure CC3/CC3 retry threshold as 2 microseconds. */
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Write(g_flow_address + FLOW_CTLR_CC4_HVC_RETRY, (0x2 << 3));
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/* Read the retry register to ensure writes take. */
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Read(g_flow_address + FLOW_CTLR_CC4_HVC_RETRY);
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}
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constexpr bool IsValidMessageDataSize(int size) {
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return 0 <= size && size < MessageDataSizeMax;
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}
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/* NOTE: linux "bpmp_valid_txfer" */
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constexpr bool IsTransferValid(const void *ob, int ob_size, void *ib, int ib_size) {
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return IsValidMessageDataSize(ob_size) && IsValidMessageDataSize(ib_size) && (ob_size == 0 || ob != nullptr) && (ib_size == 0 || ib != nullptr);
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}
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/* NOTE: linux "bpmp_ob_channel" */
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int BpmpGetOutboundChannel() {
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return GetCurrentCoreId();
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}
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/* NOTE: linux "bpmp_ch_sta" */
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u32 BpmpGetChannelState(int channel) {
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cpu::DataSynchronizationBarrier();
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return Read(g_sema_address + RES_SEMA_SHRD_SMP_STA) & CH_MASK(channel);
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}
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/* NOTE: linux "bpmp_master_free" */
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bool BpmpIsMasterFree(int channel) {
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return BpmpGetChannelState(channel) == MA_FREE(channel);
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}
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/* NOTE: linux "bpmp_master_acked" */
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bool BpmpIsMasterAcked(int channel) {
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return BpmpGetChannelState(channel) == MA_ACKD(channel);
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}
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/* NOTE: linux "bpmp_signal_slave" */
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void BpmpSignalSlave(int channel) {
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Write(g_sema_address + RES_SEMA_SHRD_SMP_CLR, CH_MASK(channel));
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cpu::DataSynchronizationBarrier();
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}
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/* NOTE: linux "bpmp_free_master" */
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void BpmpFreeMaster(int channel) {
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/* Transition state from ack'd to free. */
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Write(g_sema_address + RES_SEMA_SHRD_SMP_CLR, ((MA_ACKD(channel)) ^ (MA_FREE(channel))));
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cpu::DataSynchronizationBarrier();
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}
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/* NOTE: linux "bpmp_ring_doorbell" */
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void BpmpRingDoorbell() {
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Write(g_prictlr_address + ICTLR_FIR_SET(INT_SHR_SEM_OUTBOX_IBF), FIR_BIT(INT_SHR_SEM_OUTBOX_IBF));
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cpu::DataSynchronizationBarrier();
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}
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/* NOTE: linux "bpmp_wait_master_free" */
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int BpmpWaitMasterFree(int channel) {
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/* Check if the master is already freed. */
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if (BpmpIsMasterFree(channel)) {
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return 0;
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}
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/* Spin-poll for the master to be freed until timeout occurs. */
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const auto start_tick = KHardwareTimer::GetTick();
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const auto timeout = ams::svc::Tick(ChannelTimeout);
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do {
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if (BpmpIsMasterFree(channel)) {
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return 0;
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}
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} while ((KHardwareTimer::GetTick() - start_tick) < timeout);
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/* The master didn't become free. */
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return -1;
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}
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/* NOTE: linux "bpmp_wait_ack" */
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int BpmpWaitAck(int channel) {
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/* Check if the master is already ACK'd. */
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if (BpmpIsMasterAcked(channel)) {
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return 0;
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}
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/* Spin-poll for the master to be ACK'd until timeout occurs. */
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const auto start_tick = KHardwareTimer::GetTick();
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const auto timeout = ams::svc::Tick(ChannelTimeout);
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do {
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if (BpmpIsMasterAcked(channel)) {
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return 0;
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}
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} while ((KHardwareTimer::GetTick() - start_tick) < timeout);
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/* The master didn't get ACK'd. */
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return -1;
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}
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/* NOTE: linux "bpmp_write_ch" */
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int BpmpWriteChannel(int channel, int mrq, int flags, const void *data, size_t data_size) {
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/* Wait to be able to master the mailbox. */
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if (int res = BpmpWaitMasterFree(channel); res != 0) {
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return res;
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}
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/* Prepare the message. */
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MailboxData *mb = g_channel_area[channel].ob;
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mb->code = mrq;
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mb->flags = flags;
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if (data != nullptr) {
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std::memcpy(mb->data, data, data_size);
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}
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/* Signal to slave that message is available. */
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BpmpSignalSlave(channel);
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return 0;
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}
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/* NOTE: linux "__bpmp_read_ch" */
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int BpmpReadChannel(int channel, void *data, size_t data_size) {
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/* Get the message. */
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MailboxData *mb = g_channel_area[channel].ib;
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/* Copy any return data. */
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if (data != nullptr) {
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std::memcpy(data, mb->data, data_size);
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}
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/* Free the channel. */
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BpmpFreeMaster(channel);
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/* Return result. */
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return mb->code;
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}
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/* NOTE: linux "tegra_bpmp_send_receive_atomic" or "tegra_bpmp_send_receive". */
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int BpmpSendAndReceive(int mrq, const void *ob, int ob_size, void *ib, int ib_size) {
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/* Validate that the data transfer is valid. */
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if (!IsTransferValid(ob, ob_size, ib, ib_size)) {
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return -1;
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}
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/* Validate that the bpmp is connected. */
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if (!g_bpmp_connected) {
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return -1;
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}
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/* Disable interrupts. */
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KScopedInterruptDisable di;
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/* Acquire exclusive access to send mrqs. */
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KScopedSpinLock lk(g_bpmp_mrq_lock);
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/* Send the message. */
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int channel = BpmpGetOutboundChannel();
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if (int res = BpmpWriteChannel(channel, mrq, BPMP_MSG_DO_ACK, ob, ob_size); res != 0) {
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return res;
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}
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/* Send "doorbell" irq to the bpmp firmware. */
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BpmpRingDoorbell();
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/* Wait for the bpmp firmware to acknowledge our request. */
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if (int res = BpmpWaitAck(channel); res != 0) {
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return res;
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}
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/* Read the data the bpmp sent back. */
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return BpmpReadChannel(channel, ib, ib_size);
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}
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/* NOTE: linux "tegra_bpmp_send" */
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int BpmpSend(int mrq, const void *ob, int ob_size) {
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/* Validate that the data transfer is valid. */
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if (!IsTransferValid(ob, ob_size, nullptr, 0)) {
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return -1;
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}
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/* Validate that the bpmp is connected. */
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if (!g_bpmp_connected) {
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return -1;
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}
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/* Disable interrupts. */
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KScopedInterruptDisable di;
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/* Acquire exclusive access to send mrqs. */
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KScopedSpinLock lk(g_bpmp_mrq_lock);
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/* Send the message. */
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int channel = BpmpGetOutboundChannel();
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if (int res = BpmpWriteChannel(channel, mrq, 0, ob, ob_size); res != 0) {
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return res;
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}
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/* Send "doorbell" irq to the bpmp firmware. */
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BpmpRingDoorbell();
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return 0;
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}
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/* NOTE: modified linux "tegra_bpmp_enable_suspend" */
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int BpmpEnableSuspend(int mode, int flags) {
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/* Prepare data for bpmp. */
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const s32 data[] = { mode, flags };
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/* Send the data. */
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return BpmpSend(MRQ_ENABLE_SUSPEND, data, sizeof(data));
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}
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/* NOTE: linux "__bpmp_connect" */
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int ConnectToBpmp() {
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/* Check if we've already connected. */
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if (g_bpmp_connected) {
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return 0;
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}
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/* Verify that the resource semaphore state is set. */
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if (Read(g_sema_address + RES_SEMA_SHRD_SMP_STA) == 0) {
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return -1;
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}
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/* Get the channels, which the bpmp firmware has configured in advance. */
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{
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const KVirtualAddress iram_virt_addr = KMemoryLayout::GetDeviceVirtualAddress (KMemoryRegionType_LegacyLpsIram);
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const KPhysicalAddress iram_phys_addr = KMemoryLayout::GetDevicePhysicalAddress(KMemoryRegionType_LegacyLpsIram);
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for (auto i = 0; i < ChannelCount; ++i) {
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/* Trigger a get command for the desired channel. */
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Write(g_atomics_address + ATOMICS_AP0_TRIGGER, TRIGGER_CMD_GET | (i << 16));
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/* Retrieve the channel phys-addr-in-iram, and convert it to a kernel address. */
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auto *ch = GetPointer<MailboxData>(iram_virt_addr + (Read(g_atomics_address + ATOMICS_AP0_RESULT(i)) - GetInteger(iram_phys_addr)));
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/* Verify the channel isn't null. */
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/* NOTE: This is an utterly nonsense check, as this would require the bpmp firmware to specify */
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/* a phys-to-virt diff as an address. On 1.0.0, which had no ASLR, this was 0x8028C000. */
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/* However, Nintendo has the check, and we'll preserve it to be faithful. */
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if (ch == nullptr) {
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return -1;
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}
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/* Set the channel in the channel area. */
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g_channel_area[i].ib = ch;
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g_channel_area[i].ob = ch;
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}
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}
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/* Mark driver as connected to bpmp. */
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g_bpmp_connected = true;
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return 0;
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}
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/* NOTE: Modified linux "bpmp_mail_init" */
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int InitializeBpmpMail() {
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/* Check if we've already initialized. */
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if (g_bpmp_mail_initialized) {
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return 0;
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}
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/* Mark function as having been called. */
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g_bpmp_mail_initialized = true;
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/* Forward declare result/reply variables. */
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int res, request = 0, reply = 0;
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/* Try to connect to the bpmp. */
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if (res = ConnectToBpmp(); res != 0) {
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MESOSPHERE_LOG("bpmp: connect error returns %d\n", res);
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return res;
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}
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/* Ensure that we can successfully ping the bpmp. */
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request = 1;
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if (res = BpmpSendAndReceive(MRQ_PING, std::addressof(request), sizeof(request), std::addressof(reply), sizeof(reply)); res != 0) {
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MESOSPHERE_LOG("bpmp: MRQ_PING error returns %d with reply %d\n", res, reply);
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return res;
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}
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/* Configure the PMIC. */
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request = 1;
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if (res = BpmpSendAndReceive(MRQ_CPU_PMIC_SELECT, std::addressof(request), sizeof(request), std::addressof(reply), sizeof(reply)); res != 0) {
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MESOSPHERE_LOG("bpmp: MRQ_CPU_PMIC_SELECT for MAX77621 error returns %d with reply %d\n", res, reply);
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return res;
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}
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return 0;
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}
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}
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void Initialize() {
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if (!g_lps_init_done) {
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/* Get the addresses of the devices the driver needs. */
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InitializeDeviceVirtualAddresses();
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/* Configure CC3/CC4. */
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ConfigureCc3AndCc4();
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/* Initialize ccplex <-> bpmp mail. */
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/* NOTE: Nintendo does not check that this call succeeds. */
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InitializeBpmpMail();
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g_lps_init_done = true;
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}
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}
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Result EnableSuspend(bool enable) {
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/* If we're not on core 0, there's nothing to do. */
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R_SUCCEED_IF(GetCurrentCoreId() != 0);
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/* If we're not enabling suspend, there's nothing to do. */
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R_SUCCEED_IF(!enable);
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/* Instruct BPMP to enable suspend-to-sc7. */
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R_UNLESS(BpmpEnableSuspend(TEGRA_BPMP_PM_SC7, 0) == 0, svc::ResultInvalidState());
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return ResultSuccess();
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}
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void InvokeCpuSleepHandler(uintptr_t arg, uintptr_t entry) {
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/* Verify that we're allowed to perform suspension. */
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MESOSPHERE_ABORT_UNLESS(g_lps_init_done);
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MESOSPHERE_ABORT_UNLESS(GetCurrentCoreId() == 0);
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/* Save the CSITE clock source. */
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g_csite_clk_source = Read(g_clkrst_address + CLK_RST_CONTROLLER_CLK_SOURCE_CSITE);
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/* Configure CSITE clock source as CLK_M. */
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Write(g_clkrst_address + CLK_RST_CONTROLLER_CLK_SOURCE_CSITE, (0x6 << 29));
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/* Clear the top bit of PMC_SCRATCH4. */
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Write(g_pmc_address + APBDEV_PMC_SCRATCH4, Read(g_pmc_address + APBDEV_PMC_SCRATCH4) & 0x7FFFFFFF);
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/* Write 1 to PMC_SCRATCH0. This will cause the bootrom to use the warmboot code-path. */
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Write(g_pmc_address + APBDEV_PMC_SCRATCH0, 1);
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/* Read PMC_SCRATCH0 to be sure our write takes. */
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Read(g_pmc_address + APBDEV_PMC_SCRATCH0);
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/* Invoke the sleep hander. */
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KSleepManager::CpuSleepHandler(arg, entry);
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/* Disable deep power down. */
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Write(g_pmc_address + APBDEV_PMC_DPD_ENABLE, 0);
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/* Restore the saved CSITE clock source. */
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Write(g_clkrst_address + CLK_RST_CONTROLLER_CLK_SOURCE_CSITE, g_csite_clk_source);
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/* Read the CSITE clock source to ensure our configuration takes. */
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Read(g_clkrst_address + CLK_RST_CONTROLLER_CLK_SOURCE_CSITE);
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/* Configure CC3/CC4. */
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ConfigureCc3AndCc4();
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}
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void ResumeBpmpFirmware() {
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/* Halt the bpmp. */
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Write(g_flow_address + FLOW_CTLR_HALT_COP_EVENTS, (0x2 << 29));
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/* Hold the bpmp in reset. */
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Write(g_clkrst_address + CLK_RST_CONTROLLER_RST_DEV_L_SET, 0x2);
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/* Read the saved bpmp entrypoint, and write it to the relevant exception vector. */
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const u32 bpmp_entry = Read(g_pmc_address + APBDEV_PMC_SCRATCH39);
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Write(g_evp_address + EVP_COP_RESET_VECTOR, bpmp_entry);
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/* Verify that we can read back the address we wrote. */
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while (Read(g_evp_address + EVP_COP_RESET_VECTOR) != bpmp_entry) {
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/* ... */
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}
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/* Spin for 40 ticks, to give enough time for the bpmp to be reset. */
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const auto start_tick = KHardwareTimer::GetTick();
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do {
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__asm__ __volatile__("" ::: "memory");
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} while ((KHardwareTimer::GetTick() - start_tick) < 40);
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/* Take the bpmp out of reset. */
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Write(g_clkrst_address + CLK_RST_CONTROLLER_RST_DEV_L_CLR, 0x2);
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/* Resume the bpmp. */
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Write(g_flow_address + FLOW_CTLR_HALT_COP_EVENTS, (0x0 << 29));
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}
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} |