1 /* Various workarounds for chipset bugs.
2 This code runs very early and can't use the regular PCI subsystem
3 The entries are keyed to PCI bridges which usually identify chipsets
5 This is only for whole classes of chipsets with specific problems which
6 need early invasive action (e.g. before the timers are initialized).
7 Most PCI device specific workarounds can be done later and should be
9 Mainboard specific bugs should be handled by DMI entries.
10 CPU specific bugs in setup.c */
12 #include <linux/pci.h>
13 #include <linux/acpi.h>
14 #include <linux/pci_ids.h>
15 #include <asm/pci-direct.h>
17 #include <asm/io_apic.h>
19 #include <asm/iommu.h>
21 static void __init fix_hypertransport_config(int num, int slot, int func)
25 * we found a hypertransport bus
26 * make sure that we are broadcasting
27 * interrupts to all cpus on the ht bus
28 * if we're using extended apic ids
30 htcfg = read_pci_config(num, slot, func, 0x68);
31 if (htcfg & (1 << 18)) {
32 printk(KERN_INFO "Detected use of extended apic ids "
33 "on hypertransport bus\n");
34 if ((htcfg & (1 << 17)) == 0) {
35 printk(KERN_INFO "Enabling hypertransport extended "
36 "apic interrupt broadcast\n");
37 printk(KERN_INFO "Note this is a bios bug, "
38 "please contact your hw vendor\n");
40 write_pci_config(num, slot, func, 0x68, htcfg);
47 static void __init via_bugs(int num, int slot, int func)
49 #ifdef CONFIG_GART_IOMMU
50 if ((max_pfn > MAX_DMA32_PFN || force_iommu) &&
51 !gart_iommu_aperture_allowed) {
53 "Looks like a VIA chipset. Disabling IOMMU."
54 " Override with iommu=allowed\n");
55 gart_iommu_aperture_disabled = 1;
61 #ifdef CONFIG_X86_IO_APIC
63 static int __init nvidia_hpet_check(struct acpi_table_header *header)
67 #endif /* CONFIG_X86_IO_APIC */
68 #endif /* CONFIG_ACPI */
70 static void __init nvidia_bugs(int num, int slot, int func)
73 #ifdef CONFIG_X86_IO_APIC
75 * All timer overrides on Nvidia are
76 * wrong unless HPET is enabled.
77 * Unfortunately that's not true on many Asus boards.
78 * We don't know yet how to detect this automatically, but
79 * at least allow a command line override.
81 if (acpi_use_timer_override)
84 if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
85 acpi_skip_timer_override = 1;
86 printk(KERN_INFO "Nvidia board "
87 "detected. Ignoring ACPI "
89 printk(KERN_INFO "If you got timer trouble "
90 "try acpi_use_timer_override\n");
94 /* RED-PEN skip them on mptables too? */
98 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
99 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
104 b = read_pci_config_byte(num, slot, func, 0xac);
106 write_pci_config_byte(num, slot, func, 0xac, b);
108 d = read_pci_config(num, slot, func, 0x70);
110 write_pci_config(num, slot, func, 0x70, d);
112 d = read_pci_config(num, slot, func, 0x8);
117 static void __init ati_bugs(int num, int slot, int func)
122 if (acpi_use_timer_override)
125 d = ati_ixp4x0_rev(num, slot, func);
127 acpi_skip_timer_override = 1;
129 /* check for IRQ0 interrupt swap */
130 outb(0x72, 0xcd6); b = inb(0xcd7);
132 acpi_skip_timer_override = 1;
135 if (acpi_skip_timer_override) {
136 printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
137 printk(KERN_INFO "Ignoring ACPI timer override.\n");
138 printk(KERN_INFO "If you got timer trouble "
139 "try acpi_use_timer_override\n");
143 static u32 __init ati_sbx00_rev(int num, int slot, int func)
147 d = read_pci_config(num, slot, func, 0x70);
150 write_pci_config(num, slot, func, 0x70, d);
151 d = read_pci_config(num, slot, func, 0x8);
153 write_pci_config(num, slot, func, 0x70, old);
158 static void __init ati_bugs_contd(int num, int slot, int func)
162 if (acpi_use_timer_override)
165 rev = ati_sbx00_rev(num, slot, func);
169 /* check for IRQ0 interrupt swap */
170 d = read_pci_config(num, slot, func, 0x64);
172 acpi_skip_timer_override = 1;
174 if (acpi_skip_timer_override) {
175 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
176 printk(KERN_INFO "Ignoring ACPI timer override.\n");
177 printk(KERN_INFO "If you got timer trouble "
178 "try acpi_use_timer_override\n");
182 static void __init ati_bugs(int num, int slot, int func)
186 static void __init ati_bugs_contd(int num, int slot, int func)
191 #define QFLAG_APPLY_ONCE 0x1
192 #define QFLAG_APPLIED 0x2
193 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
200 void (*f)(int num, int slot, int func);
203 static struct chipset early_qrk[] __initdata = {
204 { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
205 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
206 { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
207 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
208 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
209 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
210 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
211 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
212 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
213 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
218 * check_dev_quirk - apply early quirks to a given PCI device
221 * @func: PCI function
223 * Check the vendor & device ID against the early quirks table.
225 * If the device is single function, let early_quirks() know so we don't
226 * poke at this device again.
228 static int __init check_dev_quirk(int num, int slot, int func)
236 class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
239 return -1; /* no class, treat as single function */
241 vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
243 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
245 for (i = 0; early_qrk[i].f != NULL; i++) {
246 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
247 (early_qrk[i].vendor == vendor)) &&
248 ((early_qrk[i].device == PCI_ANY_ID) ||
249 (early_qrk[i].device == device)) &&
250 (!((early_qrk[i].class ^ class) &
251 early_qrk[i].class_mask))) {
252 if ((early_qrk[i].flags &
253 QFLAG_DONE) != QFLAG_DONE)
254 early_qrk[i].f(num, slot, func);
255 early_qrk[i].flags |= QFLAG_APPLIED;
259 type = read_pci_config_byte(num, slot, func,
267 void __init early_quirks(void)
271 if (!early_pci_allowed())
274 /* Poor man's PCI discovery */
275 for (num = 0; num < 32; num++)
276 for (slot = 0; slot < 32; slot++)
277 for (func = 0; func < 8; func++) {
278 /* Only probe function 0 on single fn devices */
279 if (check_dev_quirk(num, slot, func))