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ATI Mach64 GX controller emulation.

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Maxim Poliakovski 2022-04-13 23:25:28 +02:00
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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** ATI Mach64 GX emulation.
It emulates an ATI88800GX controller with an IBM RGB514 style RAMDAC.
Emulation is limited to a basic framebuffer for now.
*/
#include <core/timermanager.h>
#include <devices/video/atimach64defs.h>
#include <devices/video/atimach64gx.h>
#include <devices/video/displayid.h>
#include <devices/video/rgb514defs.h>
#include <loguru.hpp>
#include <memaccess.h>
#include <string>
AtiMach64Gx::AtiMach64Gx()
: PCIDevice("ati-mach64-gx"), VideoCtrlBase(1024, 768)
{
supports_types(HWCompType::MMIO_DEV | HWCompType::PCI_DEV);
/* set up PCI configuration space header */
this->vendor_id = PCI_VENDOR_ATI;
this->device_id = ATI_MACH64_GX_DEV_ID;
this->class_rev = (0x030000 << 8) | 3;
this->bars_cfg[0] = 0xFF000000UL; // declare main aperture (16MB)
this->pci_notify_bar_change = [this](int bar_num) {
this->notify_bar_change(bar_num);
};
// declare expansion ROM containing FCode and Mac OS drivers
if (this->attach_exp_rom_image(std::string("113-32900-004_Apple_MACH64.bin"))) {
LOG_F(WARNING, "AtiMach64Gx: could not load ROM - this device won't work properly!");
}
// initialize display identification
this->disp_id = std::unique_ptr<DisplayID> (new DisplayID(0x07, 0x3A));
// allocate video RAM
this->vram_size = 2 << 20;
this->vram_ptr = std::unique_ptr<uint8_t[]> (new uint8_t[this->vram_size]);
}
void AtiMach64Gx::notify_bar_change(int bar_num)
{
if (bar_num) // only BAR0 is supported
return;
if (this->aperture_base != (this->bars[bar_num] & 0xFFFFFFF0UL)) {
if (this->aperture_base) {
LOG_F(WARNING, "AtiMach64Gx: deallocating I/O memory not implemented");
}
this->aperture_base = this->bars[0] & 0xFFFFFFF0UL;
this->host_instance->pci_register_mmio_region(this->aperture_base,
APERTURE_SIZE, this);
// copy aperture address to CONFIG_CNTL:CFG_MEM_AP_LOC
this->config_cntl = (this->config_cntl & 0xFFFFC00FUL) |
((this->aperture_base >> 18) & 0x3FF0U);
LOG_F(INFO, "AtiMach64Gx: aperture address set to 0x%08X", this->aperture_base);
}
}
// map I/O register index to MMIO register offset
static const uint32_t io_idx_to_reg_offset[32] = {
ATI_CRTC_H_TOTAL_DISP, ATI_CRTC_H_SYNC_STRT_WID,
ATI_CRTC_V_TOTAL_DISP, ATI_CRTC_V_SYNC_STRT_WID,
ATI_CRTC_VLINE_CRNT_VLINE, ATI_CRTC_OFF_PITCH,
ATI_CRTC_INT_CNTL, ATI_CRTC_GEN_CNTL,
ATI_OVR_CLR, ATI_OVR_WID_LEFT_RIGHT,
ATI_OVR_WID_TOP_BOTTOM, ATI_CUR_CLR0,
ATI_CUR_CLR1, ATI_CUR_OFFSET,
ATI_CUR_HORZ_VERT_POSN, ATI_CUR_HORZ_VERT_OFF,
ATI_SCRATCH_REG0, ATI_SCRATCH_REG1,
ATI_CLOCK_CNTL, ATI_BUS_CNTL,
ATI_MEM_CNTL, ATI_MEM_VGA_WP_SEL,
ATI_MEM_VGA_RP_SEL, ATI_DAC_REGS,
ATI_DAC_CNTL, ATI_GEN_TEST_CNTL,
ATI_CONFIG_CNTL, ATI_CONFIG_CHIP_ID,
ATI_CONFIG_STAT0, ATI_GX_CONFIG_STAT1,
ATI_INVALID, ATI_INVALID
};
bool AtiMach64Gx::pci_io_read(uint32_t offset, uint32_t size, uint32_t* res)
{
*res = 0;
// check for valid I/O base and I/O access permission
if ((offset & 0x3FC) != 0x2EC || !(this->command & 1)) {
return false;
}
// convert ISA-style I/O address to MMIO register offset
offset = io_idx_to_reg_offset[(offset >> 10) & 0x1F] + (offset & 3);
// CONFIG_CNTL is accessible from I/O space only
if ((offset & ~3) == ATI_CONFIG_CNTL) {
*res = read_mem(((uint8_t *)&this->config_cntl) + (offset & 3), size);
} else {
*res = this->read_reg(offset, size);
}
return true;
}
bool AtiMach64Gx::pci_io_write(uint32_t offset, uint32_t value, uint32_t size)
{
// check for valid I/O base and I/O access permission
if ((offset & 0x3FC) != 0x2EC || !(this->command & 1)) {
return false;
}
// convert ISA-style I/O address to MMIO register offset
offset = io_idx_to_reg_offset[(offset >> 10) & 0x1F] + (offset & 3);
// CONFIG_CNTL is accessible from I/O space only
if ((offset & ~3) == ATI_CONFIG_CNTL) {
write_mem(((uint8_t *)&this->config_cntl) + (offset & 3), value, size);
switch (this->config_cntl & 3) {
case 0:
LOG_F(WARNING, "AtiMach64Gx: linear aperture disabled!");
break;
case 1:
LOG_F(INFO, "AtiMach64Gx: aperture size set to 4MB");
this->mm_regs_offset = MM_REGS_2_OFF;
break;
case 2:
LOG_F(INFO, "AtiMach64Gx: aperture size set to 8MB");
this->mm_regs_offset = MM_REGS_0_OFF;
break;
default:
LOG_F(ERROR, "AtiMach64Gx: invalid aperture size in CONFIG_CNTL");
}
} else {
this->write_reg(offset, value, size);
}
return true;
}
uint32_t AtiMach64Gx::read_reg(uint32_t offset, uint32_t size)
{
LOG_F(INFO, "AtiMach64Gx: read from I/O mapped reg at 0x%X", offset);
return read_mem(&this->mm_regs[offset], size);
}
void AtiMach64Gx::write_reg(uint32_t offset, uint32_t value, uint32_t size)
{
uint8_t gpio_dirs, gpio_levels;
int crtc_en;
// write value to internal registers with endian conversion
write_mem(&this->mm_regs[offset], value, size);
switch (offset & ~3) {
case ATI_CRTC_GEN_CNTL:
crtc_en = (this->mm_regs[ATI_CRTC_GEN_CNTL+3] >> 1) & 1;
if (crtc_en != this->crtc_enable) {
if (!crtc_en) {
this->disable_crtc_internal();
}
}
break;
case ATI_DAC_REGS:
if (size == 1) { // only byte accesses are allowed for DAC registers
int dac_reg_addr = ((this->mm_regs[ATI_DAC_CNTL] & 1) << 2) | (offset & 3);
rgb514_write_reg(dac_reg_addr, value);
}
break;
case ATI_DAC_CNTL:
// monitor ID is usually accessed using 8bit writes
if ((offset & 3) == 3) {
gpio_dirs = (value >> 3) & 7;
gpio_levels = value & 7;
gpio_levels = this->disp_id->read_monitor_sense(gpio_levels, gpio_dirs);
this->mm_regs[ATI_DAC_CNTL+3] = (this->mm_regs[ATI_DAC_CNTL+3] & 0xF8U) | gpio_levels;
}
break;
default:
LOG_F(INFO, "AtiMach64Gx: write 0x%X to I/O mapped reg at 0x%X", value, offset);
}
}
uint32_t AtiMach64Gx::read(uint32_t rgn_start, uint32_t offset, int size)
{
if (rgn_start == this->aperture_base) {
if (offset < this->vram_size) {
return read_mem(&this->vram_ptr[offset], size);
} else if (offset >= this->mm_regs_offset) {
return read_reg(offset - this->mm_regs_offset, size);
}
}
// memory mapped expansion ROM region
if (rgn_start >= this->exp_rom_addr && offset < this->exp_rom_size) {
return read_mem(&this->exp_rom_data[offset], size);
}
return 0;
}
void AtiMach64Gx::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
{
if (rgn_start == this->aperture_base) {
if (offset < this->vram_size) {
write_mem(&this->vram_ptr[offset], value, size);
} else if (offset >= this->mm_regs_offset) {
write_reg(offset - this->mm_regs_offset, value, size);
}
}
}
void AtiMach64Gx::enable_crtc_internal()
{
int new_width = (this->mm_regs[ATI_CRTC_H_TOTAL_DISP+2] + 1) * 8;
int new_height = (READ_WORD_LE_A(&this->mm_regs[ATI_CRTC_V_TOTAL_DISP+2]) & 0x7FFUL) + 1;
if (new_width != this->active_width || new_height != this->active_height) {
LOG_F(WARNING, "AtiMach64Gx: display window resizing not implemented yet!");
}
/* calculate display refresh rate */
int hori_total = (this->mm_regs[ATI_CRTC_H_TOTAL_DISP] + 1) * 8;
int vert_total = (READ_WORD_LE_A(&this->mm_regs[ATI_CRTC_V_TOTAL_DISP]) & 0x7FFUL) + 1;
this->refresh_rate = this->pixel_clock / hori_total / vert_total;
int32_t src_offset = (READ_DWORD_LE_A(&this->mm_regs[ATI_CRTC_OFF_PITCH]) & 0xFFFFFU) * 8;
this->fb_pitch = ((READ_DWORD_LE_A(&this->mm_regs[ATI_CRTC_OFF_PITCH])) >> 19) & 0x1FF8U;
this->fb_ptr = &this->vram_ptr[src_offset];
// specify framebuffer converter
switch (this->pixel_depth) {
case 8:
this->convert_fb_cb = [this](uint8_t *dst_buf, int dst_pitch) {
this->convert_frame_8bpp(dst_buf, dst_pitch);
};
break;
default:
ABORT_F("AtiMach64Gx: unsupported pixel depth %d", this->pixel_depth);
}
uint64_t refresh_interval = static_cast<uint64_t>(1.0f / this->refresh_rate * NS_PER_SEC + 0.5);
TimerManager::get_instance()->add_cyclic_timer(
refresh_interval,
[this]() {
this->update_screen();
}
);
this->update_screen();
this->crtc_on = true;
this->crtc_enable = 1;
}
void AtiMach64Gx::disable_crtc_internal()
{
this->crtc_enable = 0;
}
// ========================== IBM RGB514 related code ==========================
void AtiMach64Gx::rgb514_write_reg(uint8_t reg_addr, uint8_t value)
{
switch (reg_addr) {
case Rgb514::CLUT_ADDR_WR:
this->clut_index = value;
break;
case Rgb514::CLUT_DATA:
this->clut_color[this->comp_index++] = value;
if (this->comp_index >= 3) {
// TODO: combine separate components into a single ARGB value
this->palette[this->clut_index][0] = this->clut_color[0];
this->palette[this->clut_index][1] = this->clut_color[1];
this->palette[this->clut_index][2] = this->clut_color[2];
this->palette[this->clut_index][3] = 255;
this->clut_index++;
this->comp_index = 0;
}
break;
case Rgb514::CLUT_MASK:
if (value != 0xFF) {
LOG_F(WARNING, "RGB514: pixel mask set to 0x%X", value);
}
break;
case Rgb514::INDEX_LOW:
this->dac_idx_lo = value;
break;
case Rgb514::INDEX_HIGH:
this->dac_idx_hi = value;
break;
case Rgb514::INDEX_DATA:
this->rgb514_write_ind_reg((this->dac_idx_hi << 8) + this->dac_idx_lo, value);
break;
default:
LOG_F(WARNING, "RGB514: access to unimplemented register at 0x%X", reg_addr);
}
}
void AtiMach64Gx::rgb514_write_ind_reg(uint8_t reg_addr, uint8_t value)
{
LOG_F(INFO, "RGB514: write 0x%X to register 0x%X", value, reg_addr);
this->dac_regs[reg_addr] = value;
switch (reg_addr) {
case Rgb514::MISC_CLK_CNTL:
if (value & PLL_ENAB) {
if ((this->dac_regs[Rgb514::PLL_CTL_1] & 3) != 1)
ABORT_F("RGB514: unsupported PLL source");
int m = 8 >> (this->dac_regs[Rgb514::F0_M0] >> 6);
int vco_div = (this->dac_regs[Rgb514::F0_M0] & 0x3F) + 65;
int ref_div = (this->dac_regs[Rgb514::F1_N0] & 0x1F) * m;
this->pixel_clock = ATI_XTAL * vco_div / ref_div;
LOG_F(INFO, "RGB514: dot clock set to %f Hz", this->pixel_clock);
}
break;
case Rgb514::PIX_FORMAT:
if (value == 3) {
this->pixel_depth = 8;
// HACK: not the best place for enabling display output!
this->enable_crtc_internal();
} else {
ABORT_F("RGB514: unimplemented pixel format %d", value);
}
break;
}
}

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** ATI Mach64 GX definitions. */
#ifndef ATI_MACH64_GX_H
#define ATI_MACH64_GX_H
#include <devices/common/pci/pcidevice.h>
#include <devices/video/atimach64defs.h>
#include <devices/video/displayid.h>
#include <devices/video/videoctrl.h>
#include <cinttypes>
#include <memory>
class AtiMach64Gx : public PCIDevice, public VideoCtrlBase {
public:
AtiMach64Gx();
~AtiMach64Gx() = default;
/* PCI device methods */
bool supports_io_space(void) {
return true;
};
/* I/O space access methods */
bool pci_io_read(uint32_t offset, uint32_t size, uint32_t* res);
bool pci_io_write(uint32_t offset, uint32_t value, uint32_t size);
/* MMIODevice methods */
uint32_t read(uint32_t rgn_start, uint32_t offset, int size);
void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size);
protected:
void notify_bar_change(int bar_num);
uint32_t read_reg(uint32_t offset, uint32_t size);
void write_reg(uint32_t offset, uint32_t value, uint32_t size);
void enable_crtc_internal();
void disable_crtc_internal();
void rgb514_write_reg(uint8_t reg_addr, uint8_t value);
void rgb514_write_ind_reg(uint8_t reg_addr, uint8_t value);
private:
uint8_t mm_regs[2048] = { 0 }; // internal registers
int vram_size;
uint32_t aperture_base;
uint32_t config_cntl;
uint32_t mm_regs_offset;
int crtc_enable = 0;
// RGB514 RAMDAC state
uint8_t dac_idx_lo;
uint8_t dac_idx_hi;
uint8_t clut_index;
uint8_t comp_index;
uint8_t clut_color[3];
uint8_t dac_regs[256];
std::unique_ptr<DisplayID> disp_id;
std::unique_ptr<uint8_t[]> vram_ptr;
};
#endif /* ATI_MACH64_GX_H */

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** IBM RGB514 RAMDAC definitions. */
#include <cinttypes>
#ifndef IBM_RGB514_DEFS_H
#define IBM_RGB514_DEFS_H
namespace Rgb514 {
#define PLL_ENAB 1
/** RGB514 direct register addresses. */
enum {
// standard VGA registers
CLUT_ADDR_WR = 0,
CLUT_DATA = 1,
CLUT_MASK = 2,
CLUT_ADDR_RD = 3,
// extended registers
INDEX_LOW = 4,
INDEX_HIGH = 5,
INDEX_DATA = 6,
INDEX_CNTL = 7
};
/** RGB514 indirect registers. */
enum {
MISC_CLK_CNTL = 0x0002,
HOR_SYNC_POS = 0x0004,
PWR_MNMGMT = 0x0005,
PIX_FORMAT = 0x000A,
PLL_CTL_1 = 0x0010,
F0_M0 = 0x0020,
F1_N0 = 0x0021,
MISC_CNTL_1 = 0x0070,
MISC_CNTL_2 = 0x0071,
VRAM_MASK_LO = 0x0090,
VRAM_MASK_HI = 0x0091,
};
}; // namespace Rgb514
#endif // IBM_RGB514_DEFS_H