Add support for Intel Panther Point PCH
[coreboot.git] / src / southbridge / intel / bd82x6x / pci.c
1 /*
2  * This file is part of the coreboot project.
3  *
4  * Copyright (C) 2008-2009 coresystems GmbH
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License as
8  * published by the Free Software Foundation; version 2 of
9  * the License.
10  *
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.
15  *
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
19  */
20
21 #include <console/console.h>
22 #include <device/device.h>
23 #include <device/pci.h>
24 #include <device/pci_ids.h>
25 #include "pch.h"
26
27 static void pci_init(struct device *dev)
28 {
29         u16 reg16;
30         u8 reg8;
31
32         printk(BIOS_DEBUG, "PCI init.\n");
33         /* Enable Bus Master */
34         reg16 = pci_read_config16(dev, PCI_COMMAND);
35         reg16 |= PCI_COMMAND_MASTER;
36         pci_write_config16(dev, PCI_COMMAND, reg16);
37
38         /* This device has no interrupt */
39         pci_write_config8(dev, INTR, 0xff);
40
41         /* disable parity error response and SERR */
42         reg16 = pci_read_config16(dev, BCTRL);
43         reg16 &= ~(1 << 0);
44         reg16 &= ~(1 << 1);
45         pci_write_config16(dev, BCTRL, reg16);
46
47         /* Master Latency Count must be set to 0x04! */
48         reg8 = pci_read_config8(dev, SMLT);
49         reg8 &= 0x07;
50         reg8 |= (0x04 << 3);
51         pci_write_config8(dev, SMLT, reg8);
52
53         /* Will this improve throughput of bus masters? */
54         pci_write_config8(dev, PCI_MIN_GNT, 0x06);
55
56         /* Clear errors in status registers */
57         reg16 = pci_read_config16(dev, PSTS);
58         //reg16 |= 0xf900;
59         pci_write_config16(dev, PSTS, reg16);
60
61         reg16 = pci_read_config16(dev, SECSTS);
62         // reg16 |= 0xf900;
63         pci_write_config16(dev, SECSTS, reg16);
64 }
65
66 #undef PCI_BRIDGE_UPDATE_COMMAND
67 static void ich_pci_dev_enable_resources(struct device *dev)
68 {
69         const struct pci_operations *ops;
70         uint16_t command;
71
72         /* Set the subsystem vendor and device id for mainboard devices */
73         ops = ops_pci(dev);
74         if (dev->on_mainboard && ops && ops->set_subsystem) {
75                 printk(BIOS_DEBUG, "%s subsystem <- %02x/%02x\n",
76                         dev_path(dev),
77                         CONFIG_MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID,
78                         CONFIG_MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID);
79                 ops->set_subsystem(dev,
80                         CONFIG_MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID,
81                         CONFIG_MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID);
82         }
83
84         command = pci_read_config16(dev, PCI_COMMAND);
85         command |= dev->command;
86 #ifdef PCI_BRIDGE_UPDATE_COMMAND
87         /* If we write to PCI_COMMAND, on some systems
88          * this will cause the ROM and APICs not being visible
89          * anymore.
90          */
91         printk(BIOS_DEBUG, "%s cmd <- %02x\n", dev_path(dev), command);
92         pci_write_config16(dev, PCI_COMMAND, command);
93 #else
94         printk(BIOS_DEBUG, "%s cmd <- %02x (NOT WRITTEN!)\n", dev_path(dev), command);
95 #endif
96 }
97
98 static void ich_pci_bus_enable_resources(struct device *dev)
99 {
100         uint16_t ctrl;
101         /* enable IO in command register if there is VGA card
102          * connected with (even it does not claim IO resource)
103          */
104         if (dev->link_list->bridge_ctrl & PCI_BRIDGE_CTL_VGA)
105                 dev->command |= PCI_COMMAND_IO;
106         ctrl = pci_read_config16(dev, PCI_BRIDGE_CONTROL);
107         ctrl |= dev->link_list->bridge_ctrl;
108         ctrl |= (PCI_BRIDGE_CTL_PARITY + PCI_BRIDGE_CTL_SERR); /* error check */
109         printk(BIOS_DEBUG, "%s bridge ctrl <- %04x\n", dev_path(dev), ctrl);
110         pci_write_config16(dev, PCI_BRIDGE_CONTROL, ctrl);
111
112         /* This is the reason we need our own pci_bus_enable_resources */
113         ich_pci_dev_enable_resources(dev);
114 }
115
116 static void set_subsystem(device_t dev, unsigned vendor, unsigned device)
117 {
118         /* NOTE: This is not the default position! */
119         if (!vendor || !device) {
120                 pci_write_config32(dev, 0x54,
121                                 pci_read_config32(dev, PCI_VENDOR_ID));
122         } else {
123                 pci_write_config32(dev, 0x54,
124                                 ((device & 0xffff) << 16) | (vendor & 0xffff));
125         }
126 }
127
128 static struct pci_operations pci_ops = {
129         .set_subsystem = set_subsystem,
130 };
131
132 static struct device_operations device_ops = {
133         .read_resources         = pci_bus_read_resources,
134         .set_resources          = pci_dev_set_resources,
135         .enable_resources       = ich_pci_bus_enable_resources,
136         .init                   = pci_init,
137         .scan_bus               = pci_scan_bridge,
138         .ops_pci                = &pci_ops,
139 };
140
141 static const struct pci_driver pch_pci __pci_driver = {
142         .ops    = &device_ops,
143         .vendor = PCI_VENDOR_ID_INTEL,
144         .device = 0x2448,
145 };