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/*
Copyright (c) 2003 Andreas Robinson, All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <fusion/shmalloc.h>
#include "uc_fifo.h"
//#define UC_FIFO_DUMP_DATA
// Private functions ---------------------------------------------------------
/**
* Pad the FIFO buffer to a 32 byte boundary. Used by uc_flush_agp().
* @note Equivalent DRI code is in via_ioctl::viaFlushPrimsLocked()
*/
static void uc_fifo_pad(struct uc_fifo* fifo)
{
switch (fifo->used & 0x7)
{
case 0:
break;
case 2:
UC_FIFO_ADD(fifo, HALCYON_HEADER2);
UC_FIFO_ADD(fifo, HC_ParaType_NotTex << 16);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
break;
case 4:
UC_FIFO_ADD(fifo, HALCYON_HEADER2);
UC_FIFO_ADD(fifo, HC_ParaType_NotTex << 16);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
break;
case 6:
UC_FIFO_ADD(fifo, HALCYON_HEADER2);
UC_FIFO_ADD(fifo, HC_ParaType_NotTex << 16);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
UC_FIFO_ADD(fifo, HC_DUMMY);
break;
default:
break;
}
}
/**
* Manually write the FIFO buffer to the hardware.
* @note Equivalent DRI code is in via_ioctl::flush_sys()
*/
void uc_fifo_flush_sys(struct uc_fifo* fifo, volatile void *regs)
{
u32* p;
u32* q;
volatile u32* hwregs = regs;
volatile u32* reg_tset = regs + VIA_REG_TRANSET;
volatile u32* reg_tspace = regs + VIA_REG_TRANSPACE;
int check2Dcmd;
u32 addr;
p = fifo->buf;
q = fifo->head;
check2Dcmd = 0;
uc_fifo_pad(fifo);
#ifdef UC_FIFO_DUMP_DATA
printf("Flushing FIFO ... \n");
#endif
while (p != q) {
if (*p == HALCYON_HEADER2) {
p++;
check2Dcmd = !(*p == HALCYON_SUB_ADDR0);
#ifdef UC_FIFO_DUMP_DATA
printf("tset = 0x%08x\n", *p);
#endif
*reg_tset = *p;
p++;
}
else if (check2Dcmd && ((*p & HALCYON_HEADER1MASK) == HALCYON_HEADER1)) {
addr = (*p) & 0x0000001f;
p++;
#ifdef UC_FIFO_DUMP_DATA
printf("2D (0x%02x) = 0x%x\n", addr << 2, *p);
#endif
*(hwregs + addr) = *p;
p++;
}
else if ((*p & HALCYON_FIREMASK) == HALCYON_FIRECMD) {
#ifdef UC_FIFO_DUMP_DATA
printf("tspace = 0x%08x\n", *p);
#endif
*reg_tspace = *p;
p++;
if ((p != q) && ((*p & HALCYON_FIREMASK) == HALCYON_FIRECMD))
p++;
if ((*p & HALCYON_CMDBMASK) != HC_ACMD_HCmdB)
check2Dcmd = 1;
}
else {
#ifdef UC_FIFO_DUMP_DATA
printf("tspace = 0x%08x\n", *p);
#endif
*reg_tspace = *p;
p++;
}
}
fifo->head = fifo->buf;
fifo->used = 0;
fifo->prep = 0;
}
/** Use an AGP transfer to write the FIFO buffer to the hardware. Not implemented. */
#if 0
static void uc_fifo_flush_agp(struct uc_fifo* fifo)
{
// TODO - however, there is no point in doing this, because
// an AGP transfer can require more register writes than
// needed for drawing a single primitive. DirectFB needs to
// adopt a begin/end architecture first, like OpenGL has.
fifo->head = fifo->buf;
fifo->used = 0;
fifo->prep = 0;
}
#endif
// Public functions ----------------------------------------------------------
/** Create a FIFO. Returns NULL on failure. */
struct uc_fifo* uc_fifo_create(FusionSHMPoolShared *pool, size_t size)
{
struct uc_fifo* fifo;
size += 32; // Needed for padding.
fifo = SHCALLOC(pool, 1, sizeof(struct uc_fifo));
if (!fifo) return NULL;
// Note: malloc won't work for DMA buffers...
fifo->buf = SHMALLOC(pool, sizeof(u32) * size);
if (!(fifo->buf)) {
SHFREE(pool, fifo);
return NULL;
}
fifo->head = fifo->buf;
fifo->used = 0;
fifo->size = (unsigned int) size;
fifo->prep = 0;
//fifo->flush_sys = uc_fifo_flush_sys;
//fifo->flush = uc_fifo_flush_sys;
return fifo;
}
/** Destroy a FIFO */
void uc_fifo_destroy(FusionSHMPoolShared *pool, struct uc_fifo* fifo)
{
if (fifo) {
if (fifo->buf) {
SHFREE(pool, fifo->buf);
fifo->buf = NULL;
}
SHFREE(pool, fifo);
}
}
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