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bdk: smmu: add smmu disable

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CTCaer
2025-06-22 12:52:55 +03:00
parent 1fbecfc76a
commit f365dd40f4
2 changed files with 35 additions and 8 deletions
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42
bdk/mem/smmu.c
View File

@@ -1,7 +1,7 @@
/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2018 balika011
* Copyright (c) 2018-2024 CTCaer
* Copyright (c) 2018-2025 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -54,10 +54,12 @@
#define SMMU_PDN_TO_ADDR(pdn) ((pdn) << SMMU_PDN_SHIFT)
#define SMMU_PTB(page, attr) (((attr) << 29u) | ((page) >> SMMU_PAGE_SHIFT))
static void *smmu_heap = (void *)SMMU_HEAP_ADDR;
#define SMMU_PAYLOAD_EN_SHIFT 4
#define SMMU_PAYLOAD_EN_SET 0x20
#define SMMU_PAYLOAD_EN_UNSET 0x00
// Enabling SMMU requires a TZ (EL3) secure write. MC(MC_SMMU_CONFIG) = 1;
static const u8 smmu_enable_payload[] = {
static u8 smmu_enable_payload[] = {
0xC1, 0x00, 0x00, 0x18, // 0x00: LDR W1, =0x70019010
0x20, 0x00, 0x80, 0xD2, // 0x04: MOV X0, #0x1
0x20, 0x00, 0x00, 0xB9, // 0x08: STR W0, [X1]
@@ -67,6 +69,9 @@ static const u8 smmu_enable_payload[] = {
0x10, 0x90, 0x01, 0x70, // 0x18: MC_SMMU_CONFIG
};
static void *smmu_heap = (void *)SMMU_HEAP_ADDR;
static bool smmu_enabled = false;
void *smmu_page_zalloc(u32 num)
{
void *page = smmu_heap;
@@ -95,7 +100,6 @@ static void _smmu_flush_regs()
void smmu_flush_all()
{
// Flush the entire page table cache.
MC(MC_SMMU_PTC_FLUSH) = 0;
_smmu_flush_regs();
@@ -117,9 +121,7 @@ void smmu_init()
void smmu_enable()
{
static bool enabled = false;
if (enabled)
if (smmu_enabled)
return;
// Launch payload on CCPLEX in order to set SMMU enable bit.
@@ -129,7 +131,31 @@ void smmu_enable()
smmu_flush_all();
enabled = true;
smmu_enabled = true;
}
void smmu_disable()
{
if (!smmu_enabled)
return;
// Set payload to disable SMMU.
smmu_enable_payload[SMMU_PAYLOAD_EN_SHIFT] = SMMU_PAYLOAD_EN_UNSET;
smmu_flush_all();
bpmp_mmu_maintenance(BPMP_MMU_MAINT_CLN_INV_WAY, false);
// Launch payload on CCPLEX in order to set SMMU enable bit.
ccplex_boot_cpu0((u32)smmu_enable_payload, false);
msleep(100);
ccplex_powergate_cpu0();
smmu_flush_all();
// Restore payload to SMMU enable.
smmu_enable_payload[SMMU_PAYLOAD_EN_SHIFT] = SMMU_PAYLOAD_EN_SET;
smmu_enabled = false;
}
void smmu_reset_heap()

1
bdk/mem/smmu.h
View File

@@ -63,6 +63,7 @@ void *smmu_page_zalloc(u32 num);
void smmu_flush_all();
void smmu_init();
void smmu_enable();
void smmu_disable();
void smmu_reset_heap();
void *smmu_init_domain(u32 dev_base, u32 asid);
void smmu_deinit_domain(u32 dev_base, u32 asid);