platform: add DMA support for the EZ-Flash Parallel

README.md

@@ -31,7 +31,7 @@ Note that there can be some game compatibility differences between different pla
 | DATEL         | DATEL devices consisting of GAMES n' MUSIC and Action Replay DS(i) Media Edition               | ❌ |
 | DSPICO        | DSpico                                                                                         | ✅ |
 | DSTT          | DSTT, SuperCard DSONE SDHC, r4isdhc.com carts 2014+, r4i-sdhc.com carts, various derivatives   | ❌ |
-| EZP           | EZ-Flash Parallel                                                                              | ❌ |
+| EZP           | EZ-Flash Parallel                                                                              | ✅ |
 | G003          | M3i Zero (GMP-Z003)                                                                            | ✅ |
 | ISNITRO       | Supports the IS-NITRO-EMULATOR through agb semihosting.                                        | ❌ |
 | M3DS          | M3 DS Real, M3i Zero, iTouchDS, r4rts.com, r4isdhc.com RTS (black)                             | ❌ |

arm9/source/patches/platform/ezp/EzpLoaderPlatform.h

@@ -1,6 +1,7 @@
 #pragma once
 #include "../LoaderPlatform.h"
 #include "EzpReadSectorsPatchCode.h"
+#include "EzpReadSectorsDmaPatchCode.h"
 #include "EzpReadSdDataPatchCode.h"
 #include "EzpWriteSectorsPatchCode.h"
 
@@ -21,6 +22,13 @@ class EzpLoaderPlatform : public LoaderPlatform
         });
     }
 
+    const IReadSectorsDmaPatchCode* CreateSdReadDmaPatchCode(PatchCodeCollection& patchCodeCollection,
+        PatchHeap& patchHeap, const void* miiCardDmaCopy32Ptr) const override
+    {
+        return patchCodeCollection.AddUniquePatchCode<EzpReadSectorsDmaPatchCode>(
+            patchHeap, miiCardDmaCopy32Ptr);
+    }
+
     const IWriteSectorsPatchCode* CreateSdWritePatchCode(
         PatchCodeCollection& patchCodeCollection, PatchHeap& patchHeap) const override
     {
@@ -30,5 +38,7 @@ class EzpLoaderPlatform : public LoaderPlatform
         });
     }
 
+    bool HasDmaSdReads() const override { return true; }
+
     LoaderPlatformType GetPlatformType() const override { return LoaderPlatformType::Slot1; }
 };

arm9/source/patches/platform/ezp/EzpReadSectorsDmaPatchCode.h

@@ -0,0 +1,31 @@
+#pragma once
+#include "sections.h"
+#include "patches/PatchCode.h"
+#include "../IReadSectorsDmaPatchCode.h"
+
+DEFINE_SECTION_SYMBOLS(ezp_readsectorsdma);
+
+extern "C" void ezp_readSectorsDma(u32 srcSector, u32 previousSrcSector, u32 dmaChannel, void* dst);
+extern "C" void ezp_finishReadSectorsDma(void);
+
+extern u32 ezp_readSectorsDma_miiCardDmaCopy32Ptr;
+
+class EzpReadSectorsDmaPatchCode : public PatchCode, public IReadSectorsDmaPatchCode
+{
+public:
+    explicit EzpReadSectorsDmaPatchCode(PatchHeap& patchHeap, const void* miiCardDmaCopy32Ptr)
+        : PatchCode(SECTION_START(ezp_readsectorsdma), SECTION_SIZE(ezp_readsectorsdma), patchHeap)
+    {
+        ezp_readSectorsDma_miiCardDmaCopy32Ptr = (u32)miiCardDmaCopy32Ptr;
+    }
+
+    const ReadSectorsDmaFunc GetReadSectorsDmaFunction() const override
+    {
+        return (const ReadSectorsDmaFunc)GetAddressAtTarget((void*)ezp_readSectorsDma);
+    }
+
+    const ReadSectorsDmaFinishFunc GetReadSectorsDmaFinishFunction() const override
+    {
+        return (const ReadSectorsDmaFinishFunc)GetAddressAtTarget((void*)ezp_finishReadSectorsDma);
+    }
+};

arm9/source/patches/platform/ezp/EzpReadSectorsDmaPatchCode.s

@@ -0,0 +1,96 @@
+.cpu arm946e-s
+.section "ezp_readsectorsdma", "ax"
+.syntax unified
+.thumb
+
+// r0 = src sector
+// r1 = previous src sector
+// r2 = dma channel
+// r3 = dst
+.global ezp_readSectorsDma
+.type ezp_readSectorsDma, %function
+ezp_readSectorsDma:
+    push {r4-r7,lr}
+
+    ldr r4, =0x040001A0
+    movs r7, #0x80
+    strb r7, [r4,#0x1]
+
+sector_loop:
+    // request sd read for sector 0xaabbccdd
+    // for xx number of sectors (up to 4 sectors)
+    // TODO implement multiple sectors
+    // B9 00 00 xx aa bb cc dd
+    movs r7, #0xB9
+    str r7, [r4,#0x8]
+    movs r7, #1
+    strb r7, [r4,#0xB]
+    lsrs r7, r0, #24
+    strb r7, [r4,#0xC]
+    lsrs r7, r0, #16
+    strb r7, [r4,#0xD]
+    lsrs r7, r0, #8
+    strb r7, [r4,#0xE]
+    strb r0, [r4,#0xF]
+
+    ldr r1, =0x04100010
+
+B9_poll_loop:
+    ldr r7, =0xA75860C8
+    str r7, [r4,#0x4]
+
+B9_poll_transfer_loop:
+    ldrb r7, [r4,#0x6]
+    lsrs r7, r7, #8
+    bcc B9_poll_check_transfer_end
+    ldr r5, [r1]
+
+B9_poll_check_transfer_end:
+    ldrb r7, [r4,#0x7]
+    lsrs r7, r7, #8
+    bcs B9_poll_transfer_loop
+
+    cmp r5, #0
+    bne B9_poll_loop
+
+    // Setup data read card command
+    movs r7, #0xBA
+    str r7, [r4,#0x8]
+    str r5, [r4,#0xC] // r5 is 0 here
+
+readDataWithDma:
+    movs r0, r2 // DMA channel
+    movs r2, r3 // Destination
+    movs r3, #1
+    lsls r3, r3, #9 // (1 << 9) = 512 = count
+
+    ldr r6, ezp_readSectorsDma_miiCardDmaCopy32Ptr
+    blx r6
+
+BA_data_dma:
+    movs r7, #0xC0 // select rom mode, with irq
+    strb r7, [r4,#0x1]
+    ldr r7, =0xA15A6000
+    str r7, [r4,#0x4]
+
+    pop {r4-r7,pc}
+
+.balign 4
+
+.global ezp_readSectorsDma_miiCardDmaCopy32Ptr
+ezp_readSectorsDma_miiCardDmaCopy32Ptr:
+    .word 0
+
+.pool
+
+.global ezp_finishReadSectorsDma
+.type ezp_finishReadSectorsDma, %function
+ezp_finishReadSectorsDma:
+    // No cleanup needed on this platform.
+    bx lr
+
+.balign 4
+
+.pool
+
+.end