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DMA + IRQ for RAM Disk

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This commit is contained in:
Romain Dolbeau 2022-10-08 18:23:01 +02:00
parent 6040bca13a
commit c08acd77ed
11 changed files with 317 additions and 158 deletions
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3
nubus-to-ztex-gateware/DeclROM/NuBusFPGADrvr_Ctrl.c
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@ -27,6 +27,9 @@ OSErr changeIRQ(AuxDCEPtr dce, char en, OSErr err) {
if (SIntInstall(dStore->siqel, dce->dCtlSlot)) {
return err;
}
write_reg(dce, GOBOFB_DEBUG, 0x88888888);
write_reg(dce, GOBOFB_DEBUG, dStore->siqel);
write_reg(dce, GOBOFB_DEBUG, dStore->siqel->sqLink);
} else {
if (SIntRemove(dStore->siqel, dce->dCtlSlot)) {
return err;

6
nubus-to-ztex-gateware/DeclROM/NuBusFPGADrvr_OpenClose.c
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@ -20,7 +20,7 @@ __attribute__ ((section (".text.fbdriver"))) short fbIrq(const long sqParameter)
asm volatile("" : "+d" (p_D1), "+d" (p_D2));
ret = 0;
irq = (*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+GOBOFB_INTR_CLEAR)));
if (irq) {
if (irq & 1) {
vblproto myVbl = *(vblproto**)0x0d28;
*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+GOBOFB_INTR_CLEAR)) = 0;
myVbl((sqParameter>>24)&0xf); // cleaner to use dStore->slot ? but require more code...
@ -34,8 +34,8 @@ __attribute__ ((section (".text.fbdriver"))) short fbIrq(const long sqParameter)
OSErr cNuBusFPGAOpen(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce)
{
OSErr ret = noErr;
write_reg(dce, GOBOFB_DEBUG, 0xBEEF0000);
write_reg(dce, GOBOFB_DEBUG, (unsigned long)dce->dCtlDevBase);
/* write_reg(dce, GOBOFB_DEBUG, 0xBEEF0000); */
/* write_reg(dce, GOBOFB_DEBUG, (unsigned long)dce->dCtlDevBase); */
if (dce->dCtlStorage == nil)
{

8
nubus-to-ztex-gateware/DeclROM/NuBusFPGAPrimaryInit_Primary.c
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@ -1,4 +1,5 @@
#include "NuBusFPGADrvr.h"
#include "NuBusFPGARAMDskDrvr.h"
#include <Traps.h>
#include <ROMDefs.h>
@ -23,10 +24,11 @@ UInt32 Primary(SEBlock* seblock) {
busMode = 1;
SwapMMUMode ( &busMode ); // to32 // this likely won't work on older MacII ???
PRIM_WRITEREG(GOBOFB_VBL_MASK, 0);// disable interrupts
PRIM_WRITEREG(GOBOFB_VBL_MASK, 0);// disable interrupts on FB
PRIM_WRITEREG(DMA_IRQ_CTL, revb(0x2));// disable/clear interrupts on DSK
PRIM_WRITEREG(GOBOFB_DEBUG, 0x87654321);// trace
PRIM_WRITEREG(GOBOFB_DEBUG, busMode);// trace
/* PRIM_WRITEREG(GOBOFB_DEBUG, 0x87654321);// trace */
/* PRIM_WRITEREG(GOBOFB_DEBUG, busMode);// trace */
hres = __builtin_bswap32((UInt32)PRIM_READREG(GOBOFB_HRES)); // fixme: endianness
vres = __builtin_bswap32((UInt32)PRIM_READREG(GOBOFB_VRES)); // fixme: endianness

11
nubus-to-ztex-gateware/DeclROM/NuBusFPGARAMDskDrvr.h
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@ -12,7 +12,6 @@
#include "NuBusFPGADrvr.h"
#ifdef ENABLE_DMA
typedef struct {
unsigned long blk_todo;
unsigned long blk_done;
@ -21,26 +20,24 @@ typedef struct {
void *ioBuffer;
int write;
} ram_dsk_op;
#endif
struct RAMDrvContext {
DrvSts2 drvsts;
ram_dsk_op op;
char slot;
#ifdef ENABLE_DMA
char irqen;
unsigned int dma_blk_size;
unsigned int dma_blk_size_mask;
unsigned int dma_blk_size_shift;
unsigned long dma_blk_base;
unsigned long dma_mem_size;
SlotIntQElement *siqel;
ram_dsk_op op;
char irqen;
#endif
};
#define DRIVE_SIZE_BYTES ((256ul-8ul)*1024ul*1024ul) // FIXME: mem size minus fb size
#ifdef ENABLE_DMA
/* FIXME; should be auto-generated for CSR addresses... */
/* WARNING: 0x00100800 is the offset to GOBOFB_BASE !! */
#define DMA_BLK_SIZE (0x00100800 | 0x00)
@ -56,15 +53,15 @@ struct RAMDrvContext {
#define DMA_IRQSTATUS (0x00100800 | 0x34)
#endif
/* ctrl */
OSErr changeRAMdskIRQ(AuxDCEPtr dce, char en, OSErr err) __attribute__ ((section (".text.dskdriver")));
OSErr changeRAMDskIRQ(AuxDCEPtr dce, char en, OSErr err) __attribute__ ((section (".text.dskdriver")));
OSErr cNuBusFPGARAMDskCtl(CntrlParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce) __attribute__ ((section (".text.dskdriver")));
/* open, close */
OSErr cNuBusFPGARAMDskOpen(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce) __attribute__ ((section (".text.dskdriver")));
OSErr cNuBusFPGARAMDskClose(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce) __attribute__ ((section (".text.dskdriver")));
/* prime */
short dskIrq(const long sqParameter) __attribute__ ((section (".text.dskdriver")));
OSErr cNuBusFPGARAMDskPrime(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce) __attribute__ ((section (".text.dskdriver")));
/* status */
OSErr cNuBusFPGARAMDskStatus(CntrlParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce) __attribute__ ((section (".text.dskdriver")));

6
nubus-to-ztex-gateware/DeclROM/NuBusFPGARAMDskDrvr_Ctrl.c
View File

@ -1,7 +1,6 @@
#include "NuBusFPGARAMDskDrvr.h"
#ifdef ENABLE_DMA
OSErr changeRAMDskIRQ(AuxDCEPtr dce, char en, OSErr err) {
struct RAMDrvContext *ctx = *(struct RAMDrvContext**)dce->dCtlStorage;
@ -19,11 +18,12 @@ OSErr changeRAMDskIRQ(AuxDCEPtr dce, char en, OSErr err) {
}
}
write_reg(dce, DMA_IRQ_CTL, en ? 0x3 : 0x2); // 0x2: always clear pending interrupt
write_reg(dce, DMA_IRQ_CTL, en ? revb(0x3) : revb(0x2)); // 0x2: always clear pending interrupt
ctx->irqen = en;
}
return noErr;
}
#endif
#pragma parameter __D0 cNuBusFPGARAMDskCtl(__A0, __A1)

43
nubus-to-ztex-gateware/DeclROM/NuBusFPGARAMDskDrvr_OpenClose.c
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@ -14,32 +14,6 @@ __attribute__ ((section (".text.dskdriver"))) static inline int dupAddDrive(unsi
return num; // should cost nothing, num is already in D0
}
/* see the comment for the FB irq */
#pragma parameter __D0 dskIrq(__A1)
__attribute__ ((section (".text.dskdriver"))) short dskIrq(const long sqParameter) {
register unsigned long p_D1 asm("d1"), p_D2 asm("d2");
AuxDCEPtr dce;
struct RAMDrvContext *ctx;
unsigned int irq;
short ret;
asm volatile("" : "+d" (p_D1), "+d" (p_D2));
dce = (AuxDCEPtr)sqParameter;
ctx = *(struct RAMDrvContext**)dce->dCtlStorage;
ret = 0;
irq = revb(*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+DMA_IRQSTATUS)));
*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+GOBOFB_DEBUG)) = 0x11111111;
*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+GOBOFB_DEBUG)) = irq;
if (irq & 1) {
unsigned int irqctrl = revb(*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+DMA_IRQ_CTL)));
irqctrl |= 0x2; // irq clear
*((volatile unsigned int*)(sqParameter+GOBOFB_BASE+DMA_IRQ_CTL)) = revb(irqctrl);
ret = 1;
}
asm volatile("" : : "d" (p_D1), "d" (p_D2));
return ret;
}
#include <ROMDefs.h>
#pragma parameter __D0 cNuBusFPGARAMDskOpen(__A0, __A1)
@ -101,6 +75,9 @@ OSErr cNuBusFPGARAMDskOpen(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce)
ctx = *(struct RAMDrvContext **)dce->dCtlStorage;
ctx->slot = slot;
// disable IRQ for now
write_reg(dce, DMA_IRQ_CTL, revb(0x2)); // 0x1 would enable irq, 0x2 is auto-clear so we make sure there's no spurious IRQ pending ; should be already done by Pirmary
dsptr = &ctx->drvsts;
// dsptr->track /* current track */
dsptr->writeProt = 0; /* bit 7 = 1 if volume is locked */
@ -150,24 +127,26 @@ OSErr cNuBusFPGARAMDskOpen(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce)
/* write_reg(dce, GOBOFB_DEBUG, ctx->dma_blk_base); */
/* write_reg(dce, GOBOFB_DEBUG, ctx->dma_mem_size); */
if (1) {
{
SlotIntQElement *siqel = (SlotIntQElement *)NewPtrSysClear(sizeof(SlotIntQElement));
if (siqel == NULL) {
return openErr;
}
// disable IRQ for now
write_reg(dce, DMA_IRQ_CTL, 0x2); // 0x1 would enable irq, 0x2 is auto-clear so we make sure there's no spurious IRQ pending
siqel->sqType = sIQType;
siqel->sqPrio = 7;
siqel->sqAddr = dskIrq;
siqel->sqParm = (long)dce;
ctx->siqel = siqel;
ctx->irqen = 0;
write_reg(dce, GOBOFB_DEBUG, siqel);
write_reg(dce, GOBOFB_DEBUG, ctx);
ctx->op.blk_todo = 0;
ctx->op.blk_done = 0;
ctx->op.blk_offset = 0;
ctx->op.blk_doing = 0;
ctx->op.ioBuffer = 0;
ctx->op.write = 0;
}
#endif

206
nubus-to-ztex-gateware/DeclROM/NuBusFPGARAMDskDrvr_Prime.c
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@ -9,6 +9,7 @@ __attribute__ ((section (".text.dskdriver"))) static inline void waitSome(unsign
}
}
#ifdef ENABLE_DMA
__attribute__ ((section (".text.dskdriver"))) static void startOneOp(struct RAMDrvContext *ctx, const AuxDCEPtr dce) {
if (ctx->op.blk_todo > 0) {
ctx->op.blk_doing = ctx->op.blk_todo;
@ -17,13 +18,15 @@ __attribute__ ((section (".text.dskdriver"))) static void startOneOp(struct RAMD
}
write_reg(dce, DMA_BLK_ADDR, revb(ctx->dma_blk_base + ctx->op.blk_offset));
write_reg(dce, DMA_DMA_ADDR, revb(ctx->op.ioBuffer + (ctx->op.blk_done << ctx->dma_blk_size_shift)));
write_reg(dce, DMA_BLK_CNT, revb((ctx->op.write ? 0x80000000ul : 0x00000000ul) | ctx->op.blk_doing));
ctx->op.blk_done += ctx->op.blk_doing;
ctx->op.blk_todo -= ctx->op.blk_doing;
ctx->op.blk_offset += ctx->op.blk_doing;
write_reg(dce, DMA_BLK_CNT, revb((ctx->op.write ? 0x80000000ul : 0x00000000ul) | ctx->op.blk_doing));
}
}
#endif
#ifdef ENABLE_DMA
__attribute__ ((section (".text.dskdriver"))) static OSErr waitForHW(struct RAMDrvContext *ctx, const AuxDCEPtr dce) {
unsigned long count, max_count, delay;
unsigned long blk_cnt, status;
@ -49,23 +52,125 @@ __attribute__ ((section (".text.dskdriver"))) static OSErr waitForHW(struct RAMD
}
return ret;
}
#endif
/* Devices 1-34 (p54) */
#pragma parameter __D0 cNuBusFPGARAMDskPrime(__A0, __A1)
OSErr cNuBusFPGARAMDskPrime(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce)
{
OSErr ret = noErr;
#ifdef ENABLE_DMA
/* see the comment for the FB irq */
#pragma parameter __D0 dskIrq(__A1)
__attribute__ ((section (".text.dskdriver"))) short dskIrq(const long sqParameter) {
register unsigned long p_D1 asm("d1"), p_D2 asm("d2");
AuxDCEPtr dce;
struct RAMDrvContext *ctx;
/* write_reg(dce, GOBOFB_DEBUG, 0xDEAD0003); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioTrap); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioPosMode); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioReqCount); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioPosOffset); */
unsigned int irq;
short ret;
asm volatile("" : "+d" (p_D1), "+d" (p_D2));
dce = (AuxDCEPtr)sqParameter;
ctx = *(struct RAMDrvContext**)dce->dCtlStorage;
ret = 0;
irq = revb(read_reg(dce, DMA_IRQSTATUS));
if (irq & 1) {
unsigned int irqctrl = revb(read_reg(dce, DMA_IRQ_CTL));
irqctrl |= 0x2; // irq clear
write_reg(dce, DMA_IRQ_CTL, revb(irqctrl));
if (ctx->op.blk_todo > 0) {
startOneOp(ctx, dce);
} else {
if (ctx->op.blk_doing > 0) {
ctx->op.blk_doing = 0; // reset just in case
IODone((DCtlPtr)dce, noErr);
}
}
ret = 1;
}
asm volatile("" : : "d" (p_D1), "d" (p_D2));
return ret;
}
#endif
#ifdef ENABLE_DMA
__attribute__ ((section (".text.dskdriver"))) static OSErr doAsync(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce, struct RAMDrvContext *ctx) {
OSErr ret = noErr;
unsigned char* superslot = (unsigned char*)(((unsigned long)ctx->slot) << 28ul);
unsigned long abs_offset = 0;
/* IOParamPtr: Devices 1-53 (p73) */
/* **** WHERE **** */
switch(pb->ioPosMode & 0x000F) { // ignore rdVerify
case fsAtMark:
abs_offset = dce->dCtlPosition;
break;
case fsFromStart:
abs_offset = pb->ioPosOffset;
break;
case fsFromMark:
abs_offset = dce->dCtlPosition + pb->ioPosOffset;
break;
default:
break;
}
/* **** WHAT **** */
/* Devices 1-33 (p53) */
if ((pb->ioTrap & 0x00FF) == aRdCmd) {
if(!(pb->ioPosMode & 0x40)) { // rdVerify, let's ignore it for now
unsigned long blk_cnt, status;
blk_cnt = revb(read_reg(dce, DMA_BLK_CNT)) & 0xFFFF;
status = revb(read_reg(dce, DMA_STATUS)) & DMA_STATUS_CHECK_BITS;
if ((blk_cnt == 0) && (status == 0)) {
ctx->op.blk_todo = pb->ioReqCount >> ctx->dma_blk_size_shift;
ctx->op.blk_done = 0;
ctx->op.blk_offset = abs_offset >> ctx->dma_blk_size_shift;
ctx->op.ioBuffer = pb->ioBuffer;
ctx->op.write = 0;
/* should we do it now ? */
pb->ioActCount = pb->ioReqCount;
dce->dCtlPosition = abs_offset + pb->ioReqCount;
pb->ioPosOffset = dce->dCtlPosition;
if (ctx->op.blk_todo > 0) {
startOneOp(ctx, dce);
goto done;
}
}
if (blk_cnt || status) {
ret = readErr;
goto done;
}
}
} else if ((pb->ioTrap & 0x00FF) == aWrCmd) {
unsigned long blk_cnt, status;
blk_cnt = revb(read_reg(dce, DMA_BLK_CNT)) & 0xFFFF;
status = revb(read_reg(dce, DMA_STATUS)) & DMA_STATUS_CHECK_BITS;
if ((blk_cnt == 0) && (status == 0)) {
ctx->op.blk_todo = pb->ioReqCount >> ctx->dma_blk_size_shift;
ctx->op.blk_done = 0;
ctx->op.blk_offset = abs_offset >> ctx->dma_blk_size_shift;
ctx->op.ioBuffer = pb->ioBuffer;
ctx->op.write = 1;
/* should we do it now ? */
pb->ioActCount = pb->ioReqCount;
dce->dCtlPosition = abs_offset + pb->ioReqCount;
pb->ioPosOffset = dce->dCtlPosition;
if (ctx->op.blk_todo > 0) {
startOneOp(ctx, dce);
goto done;
}
}
if (blk_cnt || status) {
ret = writErr;
goto done;
}
} else {
ret = paramErr;
goto done;
}
done:
return ret;
}
#endif // ENABLE_DMA
__attribute__ ((section (".text.dskdriver"))) static OSErr doSync(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce, struct RAMDrvContext *ctx) {
OSErr ret = noErr;
if (ctx) {
unsigned char* superslot = (unsigned char*)(((unsigned long)ctx->slot) << 28ul);
unsigned long abs_offset = 0;
/* IOParamPtr: Devices 1-53 (p73) */
@ -163,14 +268,81 @@ OSErr cNuBusFPGARAMDskPrime(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce)
ret = paramErr;
goto done;
}
done:
ctx->op.blk_doing = 0;
return ret;
}
/* Devices 1-34 (p54) */
#pragma parameter __D0 cNuBusFPGARAMDskPrime(__A0, __A1)
OSErr cNuBusFPGARAMDskPrime(IOParamPtr pb, /* DCtlPtr */ AuxDCEPtr dce)
{
OSErr ret = noErr;
struct RAMDrvContext *ctx;
unsigned long abs_offset = 0;
/* IOParamPtr: Devices 1-53 (p73) */
/* **** WHERE **** */
switch(pb->ioPosMode & 0x000F) { // ignore rdVerify
case fsAtMark:
abs_offset = dce->dCtlPosition;
break;
case fsFromStart:
abs_offset = pb->ioPosOffset;
break;
case fsFromMark:
abs_offset = dce->dCtlPosition + pb->ioPosOffset;
break;
default:
break;
}
/* write_reg(dce, GOBOFB_DEBUG, 0xDEAD0003); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioTrap); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioPosMode); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioReqCount); */
/* write_reg(dce, GOBOFB_DEBUG, pb->ioPosOffset); */
ctx = *(struct RAMDrvContext**)dce->dCtlStorage;
if (ctx) {
#ifdef ENABLE_DMA
if ((((unsigned long)pb->ioBuffer & ctx->dma_blk_size_mask) == 0) &&
(((unsigned long)pb->ioReqCount & ctx->dma_blk_size_mask) == 0) &&
(((unsigned long)abs_offset & ctx->dma_blk_size_mask) == 0) &&
(!(pb->ioTrap & (1<<noQueueBit)))) {
ret = changeRAMDskIRQ(dce, 1, (pb->ioTrap & 0x00FF) == aWrCmd ? writErr : readErr);
if (ret != noErr) {
IODone((DCtlPtr)dce, ret);
goto done;
}
// DMA-ifiable & queuable, go async
ret = doAsync(pb, dce, ctx);
// no IODone if ongoing, done at interrupt time
if (ret != noErr)
IODone((DCtlPtr)dce, ret);
goto done;
} else
#endif
{
#ifdef ENABLE_DMA
ret = changeRAMDskIRQ(dce, 0, (pb->ioTrap & 0x00FF) == aWrCmd ? writErr : readErr);
#endif
if (ret)
goto done;
ret = doSync(pb, dce, ctx);
if (!(pb->ioTrap & (1<<noQueueBit))) {
IODone((DCtlPtr)dce, ret);
}
goto done;
}
} else {
ret = offLinErr; /* r/w requested for an off-line drive */
if (!(pb->ioTrap & (1<<noQueueBit)))
IODone((DCtlPtr)dce, ret);
goto done;
}
done:
if (!(pb->ioTrap & (1<<noQueueBit)))
IODone((DCtlPtr)dce, ret);
return ret;
}

4
nubus-to-ztex-gateware/goblin_fb.py
View File

@ -474,7 +474,7 @@ class goblin(Module, AutoCSR):
videoctrl = Signal() # reg 0x8
vbl_signal = Signal(reset = 0) # reg 0xC
self.comb += irq_line.eq(~vbl_signal | m_vbl_disable) # active low
self.comb += irq_line.eq(~vbl_signal | m_vbl_disable) # irq_line is active low
if (endian == "big"):
low_byte = slice(0, 8)
@ -557,7 +557,7 @@ class goblin(Module, AutoCSR):
# bt_addr
0x0: [ NextValue(bus.dat_r[low_byte], bt_mode), ],
0x2: [ NextValue(bus.dat_r[low_byte], videoctrl), ],
0x3: [ NextValue(bus.dat_r[low_byte], vbl_signal), ],
0x3: [ NextValue(bus.dat_r[low_byte], ~irq_line), ], # irq_line is active low
"default": [ NextValue(bus.dat_r, 0xDEADBEEF)],
0x10: [ NextValue(bus.dat_r, hres), ], # hres (r/o) # FIXME: endianess
0x11: [ NextValue(bus.dat_r, vres), ], # vres (r/o) # FIXME: endianess

8
nubus-to-ztex-gateware/nubus_full.py
View File

@ -15,8 +15,8 @@ class NuBus(Module):
platform = soc.platform
self.add_sources(platform)
led0 = platform.request("user_led", 0)
led1 = platform.request("user_led", 1)
#led0 = platform.request("user_led", 0)
#led1 = platform.request("user_led", 1)
# Signals for tri-stated nubus access
# slave
@ -264,8 +264,8 @@ class NuBus(Module):
fromsbus_fifo_din = Record(soc.fromsbus_layout)
self.comb += fromsbus_fifo.din.eq(fromsbus_fifo_din.raw_bits())
self.comb += led0.eq(~dma_fsm.ongoing("Idle"))
self.comb += led1.eq(burst)
#self.comb += led0.eq(~dma_fsm.ongoing("Idle"))
#self.comb += led1.eq(burst)
dma_fsm.act("Reset",
NextState("Idle")

8
nubus-to-ztex-gateware/nubus_full_sampling.py
View File

@ -15,8 +15,8 @@ class NuBus(Module):
platform = soc.platform
self.add_sources(platform)
led0 = platform.request("user_led", 0)
led1 = platform.request("user_led", 1)
#led0 = platform.request("user_led", 0)
#led1 = platform.request("user_led", 1)
nub_clk = ClockSignal(cd_nubus)
nub_resetn = ~ResetSignal(cd_nubus)
@ -353,8 +353,8 @@ class NuBus(Module):
fromsbus_fifo_din = Record(soc.fromsbus_layout)
self.comb += fromsbus_fifo.din.eq(fromsbus_fifo_din.raw_bits())
self.comb += led0.eq(~dma_fsm.ongoing("Idle"))
self.comb += led1.eq(burst)
#self.comb += led0.eq(~dma_fsm.ongoing("Idle"))
#self.comb += led1.eq(burst)
dma_fsm.act("Reset",
NextState("Idle")

14
nubus-to-ztex-gateware/nubus_to_fpga_soc.py
View File

@ -349,11 +349,17 @@ class NuBusFPGA(SoCCore):
self.submodules.tosbus_fifo = ClockDomainsRenamer({"read": "nubus", "write": "sys"})(AsyncFIFOBuffered(width=layout_len(self.tosbus_layout), depth=1024//data_width))
self.submodules.fromsbus_fifo = ClockDomainsRenamer({"write": "nubus", "read": "sys"})(AsyncFIFOBuffered(width=layout_len(self.fromsbus_layout), depth=512//data_width))
self.submodules.fromsbus_req_fifo = ClockDomainsRenamer({"read": "nubus", "write": "sys"})(AsyncFIFOBuffered(width=layout_len(self.fromsbus_req_layout), depth=512//data_width))
irq_line = self.platform.request("nmrq_3v3_n")
fb_irq = Signal()
dma_irq = Signal()
irq_line = self.platform.request("nmrq_3v3_n") # active low
fb_irq = Signal() # active low
dma_irq = Signal() # active low
led0 = platform.request("user_led", 0)
led1 = platform.request("user_led", 1)
self.comb += [
led0.eq(~fb_irq),
led1.eq(~dma_irq),
]
self.comb += irq_line.eq(fb_irq | dma_irq)
self.comb += irq_line.eq(fb_irq & dma_irq) # active low, enable if one is low
self.submodules.exchange_with_mem = ExchangeWithMem(soc=self,
platform=platform,