2 * This file is part of the coreboot project.
4 * Copyright (C) 2005 Linux Networx
5 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <console/console.h>
22 #include <device/device.h>
23 #include <device/pci.h>
24 #include <device/pci_ids.h>
25 #include <device/pcix.h>
27 static void pcix_tune_dev(device_t dev)
31 unsigned int cap, max_read, max_tran;
33 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
36 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
40 printk(BIOS_DEBUG, "%s PCI-X tuning\n", dev_path(dev));
42 status = pci_read_config32(dev, cap + PCI_X_STATUS);
43 orig_cmd = cmd = pci_read_config16(dev, cap + PCI_X_CMD);
45 max_read = (status & PCI_X_STATUS_MAX_READ) >> 21;
46 max_tran = (status & PCI_X_STATUS_MAX_SPLIT) >> 23;
47 if (max_read != ((cmd & PCI_X_CMD_MAX_READ) >> 2)) {
48 cmd &= ~PCI_X_CMD_MAX_READ;
51 if (max_tran != ((cmd & PCI_X_CMD_MAX_SPLIT) >> 4)) {
52 cmd &= ~PCI_X_CMD_MAX_SPLIT;
56 /* Don't attempt to handle PCI-X errors. */
57 cmd &= ~PCI_X_CMD_DPERR_E;
59 /* Enable relaxed ordering. */
63 pci_write_config16(dev, cap + PCI_X_CMD, cmd);
66 static void pcix_tune_bus(struct bus *bus)
70 for (child = bus->children; child; child = child->sibling)
74 const char *pcix_speed(u16 sstatus)
76 static const char conventional[] = "Conventional PCI";
77 static const char pcix_66mhz[] = "66MHz PCI-X";
78 static const char pcix_100mhz[] = "100MHz PCI-X";
79 static const char pcix_133mhz[] = "133MHz PCI-X";
80 static const char pcix_266mhz[] = "266MHz PCI-X";
81 static const char pcix_533mhz[] = "533MHZ PCI-X";
82 static const char unknown[] = "Unknown";
87 switch (PCI_X_SSTATUS_MFREQ(sstatus)) {
88 case PCI_X_SSTATUS_CONVENTIONAL_PCI:
89 result = conventional;
91 case PCI_X_SSTATUS_MODE1_66MHZ:
94 case PCI_X_SSTATUS_MODE1_100MHZ:
97 case PCI_X_SSTATUS_MODE1_133MHZ:
100 case PCI_X_SSTATUS_MODE2_266MHZ_REF_66MHZ:
101 case PCI_X_SSTATUS_MODE2_266MHZ_REF_100MHZ:
102 case PCI_X_SSTATUS_MODE2_266MHZ_REF_133MHZ:
103 result = pcix_266mhz;
105 case PCI_X_SSTATUS_MODE2_533MHZ_REF_66MHZ:
106 case PCI_X_SSTATUS_MODE2_533MHZ_REF_100MHZ:
107 case PCI_X_SSTATUS_MODE2_533MHZ_REF_133MHZ:
108 result = pcix_533mhz;
115 unsigned int pcix_scan_bridge(device_t dev, unsigned int max)
120 max = do_pci_scan_bridge(dev, max, pci_scan_bus);
122 /* Find the PCI-X capability. */
123 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
124 sstatus = pci_read_config16(dev, pos + PCI_X_SEC_STATUS);
126 if (PCI_X_SSTATUS_MFREQ(sstatus) != PCI_X_SSTATUS_CONVENTIONAL_PCI)
127 pcix_tune_bus(dev->link_list);
129 /* Print the PCI-X bus speed. */
130 printk(BIOS_DEBUG, "PCI: %02x: %s\n", dev->link_list->secondary,
131 pcix_speed(sstatus));
136 /** Default device operations for PCI-X bridges */
137 static struct pci_operations pcix_bus_ops_pci = {
141 struct device_operations default_pcix_ops_bus = {
142 .read_resources = pci_bus_read_resources,
143 .set_resources = pci_dev_set_resources,
144 .enable_resources = pci_bus_enable_resources,
146 .scan_bus = pcix_scan_bridge,
148 .reset_bus = pci_bus_reset,
149 .ops_pci = &pcix_bus_ops_pci,