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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <device/pcix.h>
static void pcix_tune_dev(struct device *dev)
{
u32 status;
u16 orig_cmd, cmd;
unsigned int cap, max_read, max_tran;
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
return;
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!cap)
return;
printk(BIOS_DEBUG, "%s PCI-X tuning\n", dev_path(dev));
status = pci_read_config32(dev, cap + PCI_X_STATUS);
orig_cmd = cmd = pci_read_config16(dev, cap + PCI_X_CMD);
max_read = (status & PCI_X_STATUS_MAX_READ) >> 21;
max_tran = (status & PCI_X_STATUS_MAX_SPLIT) >> 23;
if (max_read != ((cmd & PCI_X_CMD_MAX_READ) >> 2)) {
cmd &= ~PCI_X_CMD_MAX_READ;
cmd |= max_read << 2;
}
if (max_tran != ((cmd & PCI_X_CMD_MAX_SPLIT) >> 4)) {
cmd &= ~PCI_X_CMD_MAX_SPLIT;
cmd |= max_tran << 4;
}
/* Don't attempt to handle PCI-X errors. */
cmd &= ~PCI_X_CMD_DPERR_E;
/* Enable relaxed ordering. */
cmd |= PCI_X_CMD_ERO;
if (orig_cmd != cmd)
pci_write_config16(dev, cap + PCI_X_CMD, cmd);
}
static void pcix_tune_bus(struct bus *bus)
{
struct device *child;
for (child = bus->children; child; child = child->sibling)
pcix_tune_dev(child);
}
const char *pcix_speed(u16 sstatus)
{
static const char conventional[] = "Conventional PCI";
static const char pcix_66mhz[] = "66MHz PCI-X";
static const char pcix_100mhz[] = "100MHz PCI-X";
static const char pcix_133mhz[] = "133MHz PCI-X";
static const char pcix_266mhz[] = "266MHz PCI-X";
static const char pcix_533mhz[] = "533MHZ PCI-X";
static const char unknown[] = "Unknown";
const char *result;
result = unknown;
switch (PCI_X_SSTATUS_MFREQ(sstatus)) {
case PCI_X_SSTATUS_CONVENTIONAL_PCI:
result = conventional;
break;
case PCI_X_SSTATUS_MODE1_66MHZ:
result = pcix_66mhz;
break;
case PCI_X_SSTATUS_MODE1_100MHZ:
result = pcix_100mhz;
break;
case PCI_X_SSTATUS_MODE1_133MHZ:
result = pcix_133mhz;
break;
case PCI_X_SSTATUS_MODE2_266MHZ_REF_66MHZ:
case PCI_X_SSTATUS_MODE2_266MHZ_REF_100MHZ:
case PCI_X_SSTATUS_MODE2_266MHZ_REF_133MHZ:
result = pcix_266mhz;
break;
case PCI_X_SSTATUS_MODE2_533MHZ_REF_66MHZ:
case PCI_X_SSTATUS_MODE2_533MHZ_REF_100MHZ:
case PCI_X_SSTATUS_MODE2_533MHZ_REF_133MHZ:
result = pcix_533mhz;
break;
}
return result;
}
void pcix_scan_bridge(struct device *dev)
{
unsigned int pos;
u16 sstatus;
do_pci_scan_bridge(dev, pci_scan_bus);
/* Find the PCI-X capability. */
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
sstatus = pci_read_config16(dev, pos + PCI_X_SEC_STATUS);
if (PCI_X_SSTATUS_MFREQ(sstatus) != PCI_X_SSTATUS_CONVENTIONAL_PCI)
pcix_tune_bus(dev->link_list);
/* Print the PCI-X bus speed. */
printk(BIOS_DEBUG, "PCI: %02x: %s\n", dev->link_list->secondary,
pcix_speed(sstatus));
}
/** Default device operations for PCI-X bridges */
static struct pci_operations pcix_bus_ops_pci = {
.set_subsystem = 0,
};
struct device_operations default_pcix_ops_bus = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = 0,
.scan_bus = pcix_scan_bridge,
.enable = 0,
.reset_bus = pci_bus_reset,
.ops_pci = &pcix_bus_ops_pci,
};
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