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Implement Aspen memory controller.

This commit is contained in:
Maxim Poliakovski 2024-04-07 18:35:05 +02:00
parent e7da98b6bd
commit 4c9fe06229
3 changed files with 263 additions and 0 deletions
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178
devices/memctrl/aspen.cpp Normal file
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@ -0,0 +1,178 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-24 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/>.
*/
/** Aspen Memory Controller emulation. */
#include <devices/deviceregistry.h>
#include <devices/memctrl/aspen.h>
#include <loguru.hpp>
AspenCtrl::AspenCtrl() : MemCtrlBase() {
this->name = "Aspen";
supports_types(HWCompType::MEM_CTRL | HWCompType::MMIO_DEV);
// add MMIO region for the configuration and status registers
add_mmio_region(0xF8000000, 0x800, this);
}
int AspenCtrl::device_postinit() {
return this->map_phys_ram();
}
void AspenCtrl::insert_ram_dimm(int bank_num, uint32_t capacity) {
if (bank_num < 0 || bank_num > 3)
return;
uint32_t bank_size = capacity << 20; // convert to MB
switch(bank_size) {
case DRAM_CAP_1MB:
case DRAM_CAP_4MB:
case DRAM_CAP_8MB:
case DRAM_CAP_16MB:
bank_sizes[bank_num] = bank_size;
break;
default:
break;
}
}
uint32_t AspenCtrl::read(uint32_t rgn_start, uint32_t offset, int size) {
uint8_t reg_num = (offset >> 2) & 0x1F;
uint32_t reg_val;
switch(reg_num) {
case SYSTEM_ID:
reg_val = 0x40010000;
break;
case CHIP_REV:
reg_val = ASPEN_REV_1;
break;
case GPIO_IN:
case GPIO_OUT:
reg_val = 0;
break;
case GPIO_ENABLE:
reg_val = this->gpio_enable << 24;
break;
default:
LOG_F(WARNING, "%s: reading from register at 0x%X", this->name.c_str(), offset);
reg_val = 0;
}
return reg_val;
}
void AspenCtrl::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size) {
uint8_t reg_num = (offset >> 2) & 0x1F;
switch(reg_num) {
case SYSTEM_ID:
break; // ignore writes to this read-only register
case MEM_CONFIG:
if (this->ram_config != value >> 24) {
this->ram_config = value >> 24;
LOG_F(INFO, "%s: RAM config changed to 0x%X", this->name.c_str(),
this->ram_config);
}
break;
case GPIO_ENABLE:
this->gpio_enable = value >> 24;
break;
case GPIO_OUT:
LOG_F(INFO, "%s: output 0x%X to GPIO pins", this->name.c_str(), value >> 24);
break;
default:
LOG_F(WARNING, "%s: unknown register write at offset 0x%X", this->name.c_str(),
offset);
}
}
int AspenCtrl::map_phys_ram() {
uint32_t total_ram = 0, row_mask, col_mask, offset;
for (int i = 0; i < 4; i++)
total_ram += this->bank_sizes[i];
LOG_F(INFO, "%s: total RAM size = %d bytes", this->name.c_str(), total_ram);
uint32_t addr = 0;
for (int i = 0; i < 4; addr += DRAM_CAP_16MB, i++) {
if (!this->bank_sizes[i])
continue;
if (!add_ram_region(addr, this->bank_sizes[i])) {
LOG_F(ERROR, "%s: could not allocate RAM at 0x%X", this->name.c_str(), addr);
return -1;
}
switch(this->bank_sizes[i]) {
case DRAM_CAP_1MB:
row_mask = (1 << 9) - 1;
col_mask = (1 << 9) - 1;
break;
case DRAM_CAP_4MB:
row_mask = (1 << 10) - 1;
col_mask = (1 << 10) - 1;
break;
case DRAM_CAP_8MB:
row_mask = (1 << 11) - 1;
col_mask = (1 << 10) - 1;
break;
default: // DRAM_CAP_16MB
row_mask = (1 << 11) - 1;
col_mask = (1 << 11) - 1;
}
offset = ((0xC01000 >> 13) & row_mask) | ((0xC01000 >> 2) & col_mask);
if (!this->add_mem_mirror_partial(addr + 0xC01000, addr + offset, offset, 0x1000)) {
LOG_F(ERROR, "%s: could not create alias for RAM bank %d",
this->name.c_str(), i);
return -1;
}
if (this->bank_sizes[i] < DRAM_CAP_16MB) {
if (!this->add_mem_mirror_partial(addr + 0xC00000, addr + offset, offset, 0x1000)) {
LOG_F(ERROR, "%s: could not create alias for RAM bank %d",
this->name.c_str(), i);
return -1;
}
}
if (this->bank_sizes[i] < DRAM_CAP_8MB) {
if (!this->add_mem_mirror_partial(addr + 0x400000, addr + offset, offset, 0x1000)) {
LOG_F(ERROR, "%s: could not create alias for RAM bank %d",
this->name.c_str(), i);
return -1;
}
}
}
return 0;
}
static const DeviceDescription Aspen_Descriptor = {
AspenCtrl::create, {}, {}
};
REGISTER_DEVICE(Aspen, Aspen_Descriptor);

84
devices/memctrl/aspen.h Normal file
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@ -0,0 +1,84 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-24 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/>.
*/
/** Aspem Memory Controller definitions.
Aspen is a custom memory controller and PCI bridge
designed especially for Pippin.
*/
#ifndef ASPEN_MEMCTRL_H
#define ASPEN_MEMCTRL_H
#include <devices/common/mmiodevice.h>
#include <devices/memctrl/memctrlbase.h>
#include <cinttypes>
#include <memory>
/** Aspen register definitions. */
enum {
SYSTEM_ID = 4, // 0x10
CHIP_REV = 5, // 0x14
MEM_CONFIG = 6, // 0x18
GPIO_IN = 12, // 0x30
GPIO_ENABLE = 13, // 0x34
GPIO_OUT = 14, // 0x38
};
#define ASPEN_REV_1 0x01000000
/** Aspen RAM bank size bits. */
enum {
BANK_SIZE_1MB = 0, // 256Kx16, 9 rows x 9 columns
BANK_SIZE_4MB = 1, // 1Mx16, 10 rows x 10 columns
BANK_SIZE_16MB = 2, // 4Mx16, 11 rows x 11 columns
BANK_SIZE_8MB = 3, // 2Mx16, 11 rows x 10 columns
};
class AspenCtrl : public MemCtrlBase, public MMIODevice {
public:
AspenCtrl();
~AspenCtrl() = default;
static std::unique_ptr<HWComponent> create() {
return std::unique_ptr<AspenCtrl>(new AspenCtrl());
}
int device_postinit() override;
void insert_ram_dimm(int bank_num, uint32_t capacity);
// MMIODevice methods
uint32_t read(uint32_t rgn_start, uint32_t offset, int size) override;
void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size) override;
private:
int map_phys_ram();
uint8_t gpio_enable = 0;
uint32_t bank_sizes[4] = {};
uint8_t ram_config = (BANK_SIZE_16MB << 6) | (BANK_SIZE_16MB << 4) |
(BANK_SIZE_16MB << 2) | (BANK_SIZE_16MB << 0);
};
#endif // ASPEN_MEMCTRL_H

1
devices/memctrl/memctrlbase.h
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@ -30,6 +30,7 @@ class MMIODevice;
/* Common DRAM capacities. */
enum {
DRAM_CAP_1MB = (1 << 20),
DRAM_CAP_2MB = (1 << 21),
DRAM_CAP_4MB = (1 << 22),
DRAM_CAP_8MB = (1 << 23),