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machinegossamer: proper system & clocks configuration.

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This commit is contained in:
Maxim Poliakovski 2022-08-15 14:51:37 +02:00
parent 0dbcda5710
commit c5ecdb840d
1 changed files with 17 additions and 4 deletions
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21
machines/machinegossamer.cpp
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@ -92,14 +92,20 @@ static void setup_ram_slot(std::string name, int i2c_addr, int capacity_megs) {
i2c_bus->register_device(i2c_addr, ram_dimm);
}
int initialize_gossamer(std::string& id)
{
// get pointer to the memory controller/PCI host bridge object
MPC106* grackle_obj = dynamic_cast<MPC106*>(gMachineObj->get_comp_by_name("Grackle"));
// add the machine ID register
gMachineObj->add_device("MachineID", std::unique_ptr<GossamerID>(new GossamerID(0xBF3D)));
// configure the Gossamer system register
uint16_t sys_reg = FDC_TYPE_SWIM3 | BURST_ROM_TRUE
| (0x3F << PCI_A_PRSNT_POS) // pull up all PRSNT bits
| (1 << PCM_PID_POS) // CPU/Cache speed ratio = 2:1
| AIO_PRSNT_FALSE // this machine is not All-in-one
| (BUS_FREQ_66P82 << BUS_SPEED_POS) // set bus frequency
| UNKNOWN_BIT_0; // pull up bit 0
gMachineObj->add_device("MachineID", std::unique_ptr<GossamerID>(new GossamerID(sys_reg)));
grackle_obj->add_mmio_region(
0xFF000004, 4096, dynamic_cast<MMIODevice*>(gMachineObj->get_comp_by_name("MachineID")));
@ -141,8 +147,15 @@ int initialize_gossamer(std::string& id)
perch_id->set_memory(0, WhisperID, sizeof(WhisperID));
i2c_bus->register_device(0x53, perch_id);
// configure CPU clocks
uint64_t bus_freq = 66820000ULL;
uint64_t timebase_freq = bus_freq / 4;
// initialize virtual CPU and request MPC750 CPU aka G3
ppc_cpu_init(grackle_obj, PPC_VER::MPC750, 16705000ULL);
ppc_cpu_init(grackle_obj, PPC_VER::MPC750, timebase_freq);
// set CPU PLL ratio to 3.5
ppc_state.spr[SPR::HID1] = 0xE << 28;
return 0;
}