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Implement the DEC/Intel 21152-AB PCI bridge for the Dell Gn+/GXa riser card.

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This commit is contained in:
OBattler
2025-05-24 07:10:49 +02:00
parent e083daf4bb
commit fa5f1224ca
4 changed files with 68 additions and 11 deletions
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64
src/device/pci_bridge.c
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@@ -30,8 +30,10 @@
#include <86box/mem.h>
#include <86box/device.h>
#include <86box/pci.h>
#include <86box/plat_fallthrough.h>
#define PCI_BRIDGE_DEC_21150 0x10110022
#define PCI_BRIDGE_DEC_21152 0x10110024
#define AGP_BRIDGE_ALI_M5243 0x10b95243
#define AGP_BRIDGE_ALI_M5247 0x10b95247
#define AGP_BRIDGE_INTEL_440LX 0x80867181
@@ -242,12 +244,15 @@ pci_bridge_write(int func, int addr, uint8_t val, void *priv)
case 0x40:
if (dev->local == PCI_BRIDGE_DEC_21150)
val &= 0x32;
else if (dev->local == PCI_BRIDGE_DEC_21152)
val &= 0x12;
break;
case 0x41:
if (AGP_BRIDGE_VIA(dev->local))
val &= 0x7e;
else if (dev->local == PCI_BRIDGE_DEC_21150)
else if ((dev->local == PCI_BRIDGE_DEC_21150) ||
(dev->local == PCI_BRIDGE_DEC_21152))
val &= 0x07;
break;
@@ -257,18 +262,22 @@ pci_bridge_write(int func, int addr, uint8_t val, void *priv)
break;
case 0x43:
if (dev->local == PCI_BRIDGE_DEC_21150)
if ((dev->local == PCI_BRIDGE_DEC_21150) ||
(dev->local == PCI_BRIDGE_DEC_21152))
val &= 0x03;
break;
case 0x64:
if (dev->local == PCI_BRIDGE_DEC_21150)
if ((dev->local == PCI_BRIDGE_DEC_21150) ||
(dev->local == PCI_BRIDGE_DEC_21152))
val &= 0x7e;
break;
case 0x69:
if (dev->local == PCI_BRIDGE_DEC_21150)
val &= 0x3f;
else if (dev->local == PCI_BRIDGE_DEC_21152)
val = (val & 0x01) | 0x3e;
break;
case 0x86:
@@ -302,6 +311,15 @@ pci_bridge_write(int func, int addr, uint8_t val, void *priv)
break;
case 0xe0:
if (AGP_BRIDGE_ALI(dev->local)) {
if (!(dev->ctl & 0x20))
return;
} else if (dev->local == PCI_BRIDGE_DEC_21152)
val &= 0x03;
else
return;
break;
case 0xe1:
if (AGP_BRIDGE_ALI(dev->local)) {
if (!(dev->ctl & 0x20))
@@ -399,6 +417,14 @@ pci_bridge_reset(void *priv)
/* command and status */
switch (dev->local) {
case PCI_BRIDGE_DEC_21152:
dev->regs[0x08] = 0x03;
dev->regs[0x34] = 0xdc;
dev->regs[0x69] = 0x3e;
dev->regs[0xdc] = 0x01;
dev->regs[0xde] = 0x01;
dev->regs[0xe2] = 0x80;
fallthrough;
case PCI_BRIDGE_DEC_21150:
dev->regs[0x06] = 0x80;
dev->regs[0x07] = 0x02;
@@ -490,6 +516,8 @@ pci_bridge_init(const device_t *info)
uint8_t interrupt_count;
uint8_t interrupt_mask;
uint8_t slot_count;
uint8_t dell_slots[3] = { 0x09, 0x0a, 0x0b };
uint8_t dell_interrupts[3][4] = { { 1, 2, 3, 4 }, { 4, 2, 1, 3 }, { 1, 3, 4, 2 } };
pci_bridge_t *dev = (pci_bridge_t *) calloc(1, sizeof(pci_bridge_t));
@@ -499,7 +527,10 @@ pci_bridge_init(const device_t *info)
pci_bridge_reset(dev);
pci_add_bridge(AGP_BRIDGE(dev->local), pci_bridge_read, pci_bridge_write, dev, &dev->slot);
if (info->local == PCI_BRIDGE_DEC_21152)
pci_add_card(PCI_ADD_BRIDGE, pci_bridge_read, pci_bridge_write, dev, &dev->slot);
else
pci_add_bridge(AGP_BRIDGE(dev->local), pci_bridge_read, pci_bridge_write, dev, &dev->slot);
interrupt_count = sizeof(interrupts);
interrupt_mask = interrupt_count - 1;
@@ -513,16 +544,23 @@ pci_bridge_init(const device_t *info)
if (info->local == PCI_BRIDGE_DEC_21150)
slot_count = 9; /* 9 bus masters */
else if (info->local == PCI_BRIDGE_DEC_21152)
slot_count = 3; /* 3 bus masters */
else
slot_count = 1; /* AGP bridges always have 1 slot */
for (uint8_t i = 0; i < slot_count; i++) {
uint8_t slot = i;
if (info->local == PCI_BRIDGE_DEC_21152) {
slot = dell_slots[i];
memcpy(interrupts, dell_interrupts[i], 4);
}
/* Interrupts for bridge slots are assigned in round-robin: ABCD, BCDA, CDAB and so on. */
pci_bridge_log("PCI Bridge %d: downstream slot %02X interrupts %02X %02X %02X %02X\n",
dev->bus_index, i, interrupts[i & interrupt_mask],
dev->bus_index, slot, interrupts[i & interrupt_mask],
interrupts[(i + 1) & interrupt_mask], interrupts[(i + 2) & interrupt_mask],
interrupts[(i + 3) & interrupt_mask]);
pci_register_bus_slot(dev->bus_index, i, AGP_BRIDGE(dev->local) ? PCI_CARD_AGP : PCI_CARD_NORMAL,
pci_register_bus_slot(dev->bus_index, slot, AGP_BRIDGE(dev->local) ? PCI_CARD_AGP : PCI_CARD_NORMAL,
interrupts[i & interrupt_mask],
interrupts[(i + 1) & interrupt_mask],
interrupts[(i + 2) & interrupt_mask],
@@ -547,6 +585,20 @@ const device_t dec21150_device = {
.config = NULL
};
const device_t dec21152_device = {
.name = "DEC 21152 PCI Bridge",
.internal_name = "dec21152",
.flags = DEVICE_PCI,
.local = PCI_BRIDGE_DEC_21152,
.init = pci_bridge_init,
.close = NULL,
.reset = pci_bridge_reset,
.available = NULL,
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
/* AGP bridges */
const device_t ali5243_agp_device = {
.name = "ALi M5243 AGP Bridge",