-/*
+/*
* Firmware replacement code.
- *
+ *
* Work around broken BIOSes that don't set an aperture or only set the
- * aperture in the AGP bridge.
- * If all fails map the aperture over some low memory. This is cheaper than
- * doing bounce buffering. The memory is lost. This is done at early boot
- * because only the bootmem allocator can allocate 32+MB.
- *
+ * aperture in the AGP bridge.
+ * If all fails map the aperture over some low memory. This is cheaper than
+ * doing bounce buffering. The memory is lost. This is done at early boot
+ * because only the bootmem allocator can allocate 32+MB.
+ *
* Copyright 2002 Andi Kleen, SuSE Labs.
*/
#include <linux/kernel.h>
int gart_iommu_aperture_allowed __initdata = 0;
int fallback_aper_order __initdata = 1; /* 64MB */
-int fallback_aper_force __initdata = 0;
+int fallback_aper_force __initdata = 0;
int fix_aperture __initdata = 1;
/* This code runs before the PCI subsystem is initialized, so just
access the northbridge directly. */
-static u32 __init allocate_aperture(void)
+static u32 __init allocate_aperture(void)
{
u32 aper_size;
- void *p;
+ void *p;
- if (fallback_aper_order > 7)
- fallback_aper_order = 7;
- aper_size = (32 * 1024 * 1024) << fallback_aper_order;
+ if (fallback_aper_order > 7)
+ fallback_aper_order = 7;
+ aper_size = (32 * 1024 * 1024) << fallback_aper_order;
- /*
- * Aperture has to be naturally aligned. This means an 2GB aperture won't
- * have much chance of finding a place in the lower 4GB of memory.
- * Unfortunately we cannot move it up because that would make the
- * IOMMU useless.
+ /*
+ * Aperture has to be naturally aligned. This means a 2GB aperture
+ * won't have much chance of finding a place in the lower 4GB of
+ * memory. Unfortunately we cannot move it up because that would
+ * make the IOMMU useless.
*/
p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
if (!p || __pa(p)+aper_size > 0xffffffff) {
return 0;
}
printk("Mapping aperture over %d KB of RAM @ %lx\n",
- aper_size >> 10, __pa(p));
+ aper_size >> 10, __pa(p));
insert_aperture_resource((u32)__pa(p), aper_size);
- return (u32)__pa(p);
+
+ return (u32)__pa(p);
}
static int __init aperture_valid(u64 aper_base, u32 aper_size)
-{
- if (!aper_base)
+{
+ if (!aper_base)
return 0;
- if (aper_size < 64*1024*1024) {
+ if (aper_size < 64*1024*1024) {
printk("Aperture too small (%d MB)\n", aper_size>>20);
return 0;
}
if (aper_base + aper_size > 0x100000000UL) {
printk("Aperture beyond 4GB. Ignoring.\n");
- return 0;
+ return 0;
}
if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
printk("Aperture pointing to e820 RAM. Ignoring.\n");
- return 0;
- }
+ return 0;
+ }
return 1;
-}
+}
/* Find a PCI capability */
-static __u32 __init find_cap(int num, int slot, int func, int cap)
-{
- u8 pos;
+static __u32 __init find_cap(int num, int slot, int func, int cap)
+{
int bytes;
- if (!(read_pci_config_16(num,slot,func,PCI_STATUS) & PCI_STATUS_CAP_LIST))
+ u8 pos;
+
+ if (!(read_pci_config_16(num, slot, func, PCI_STATUS) &
+ PCI_STATUS_CAP_LIST))
return 0;
- pos = read_pci_config_byte(num,slot,func,PCI_CAPABILITY_LIST);
- for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
+
+ pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST);
+ for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
u8 id;
- pos &= ~3;
- id = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_ID);
+
+ pos &= ~3;
+ id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID);
if (id == 0xff)
break;
- if (id == cap)
- return pos;
- pos = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_NEXT);
- }
+ if (id == cap)
+ return pos;
+ pos = read_pci_config_byte(num, slot, func,
+ pos+PCI_CAP_LIST_NEXT);
+ }
return 0;
-}
+}
/* Read a standard AGPv3 bridge header */
static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
-{
+{
u32 apsize;
u32 apsizereg;
int nbits;
u64 aper;
printk("AGP bridge at %02x:%02x:%02x\n", num, slot, func);
- apsizereg = read_pci_config_16(num,slot,func, cap + 0x14);
+ apsizereg = read_pci_config_16(num, slot, func, cap + 0x14);
if (apsizereg == 0xffffffff) {
printk("APSIZE in AGP bridge unreadable\n");
return 0;
apsize = apsizereg & 0xfff;
/* Some BIOS use weird encodings not in the AGPv3 table. */
- if (apsize & 0xff)
- apsize |= 0xf00;
+ if (apsize & 0xff)
+ apsize |= 0xf00;
nbits = hweight16(apsize);
*order = 7 - nbits;
if ((int)*order < 0) /* < 32MB */
*order = 0;
-
- aper_low = read_pci_config(num,slot,func, 0x10);
- aper_hi = read_pci_config(num,slot,func,0x14);
+
+ aper_low = read_pci_config(num, slot, func, 0x10);
+ aper_hi = read_pci_config(num, slot, func, 0x14);
aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
- printk("Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n",
+ printk("Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n",
aper, 32 << *order, apsizereg);
if (!aperture_valid(aper, (32*1024*1024) << *order))
- return 0;
- return (u32)aper;
-}
-
-/* Look for an AGP bridge. Windows only expects the aperture in the
- AGP bridge and some BIOS forget to initialize the Northbridge too.
- Work around this here.
-
- Do an PCI bus scan by hand because we're running before the PCI
- subsystem.
+ return 0;
+ return (u32)aper;
+}
- All K8 AGP bridges are AGPv3 compliant, so we can do this scan
- generically. It's probably overkill to always scan all slots because
- the AGP bridges should be always an own bus on the HT hierarchy,
- but do it here for future safety. */
+/*
+ * Look for an AGP bridge. Windows only expects the aperture in the
+ * AGP bridge and some BIOS forget to initialize the Northbridge too.
+ * Work around this here.
+ *
+ * Do an PCI bus scan by hand because we're running before the PCI
+ * subsystem.
+ *
+ * All K8 AGP bridges are AGPv3 compliant, so we can do this scan
+ * generically. It's probably overkill to always scan all slots because
+ * the AGP bridges should be always an own bus on the HT hierarchy,
+ * but do it here for future safety.
+ */
static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
{
int num, slot, func;
/* Poor man's PCI discovery */
- for (num = 0; num < 256; num++) {
- for (slot = 0; slot < 32; slot++) {
- for (func = 0; func < 8; func++) {
+ for (num = 0; num < 256; num++) {
+ for (slot = 0; slot < 32; slot++) {
+ for (func = 0; func < 8; func++) {
u32 class, cap;
u8 type;
- class = read_pci_config(num,slot,func,
+ class = read_pci_config(num, slot, func,
PCI_CLASS_REVISION);
if (class == 0xffffffff)
- break;
-
- switch (class >> 16) {
+ break;
+
+ switch (class >> 16) {
case PCI_CLASS_BRIDGE_HOST:
case PCI_CLASS_BRIDGE_OTHER: /* needed? */
/* AGP bridge? */
- cap = find_cap(num,slot,func,PCI_CAP_ID_AGP);
+ cap = find_cap(num, slot, func,
+ PCI_CAP_ID_AGP);
if (!cap)
break;
- *valid_agp = 1;
- return read_agp(num,slot,func,cap,order);
- }
-
+ *valid_agp = 1;
+ return read_agp(num, slot, func, cap,
+ order);
+ }
+
/* No multi-function device? */
- type = read_pci_config_byte(num,slot,func,
+ type = read_pci_config_byte(num, slot, func,
PCI_HEADER_TYPE);
if (!(type & 0x80))
break;
- }
- }
+ }
+ }
}
- printk("No AGP bridge found\n");
+ printk("No AGP bridge found\n");
+
return 0;
}
void __init gart_iommu_hole_init(void)
-{
- int fix, num;
+{
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
u64 aper_base, last_aper_base = 0;
- int valid_agp = 0;
+ int fix, num, valid_agp = 0;
if (gart_iommu_aperture_disabled || !fix_aperture ||
!early_pci_allowed())
printk(KERN_INFO "Checking aperture...\n");
fix = 0;
- for (num = 24; num < 32; num++) {
+ for (num = 24; num < 32; num++) {
if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
continue;
iommu_detected = 1;
gart_iommu_aperture = 1;
- aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7;
- aper_size = (32 * 1024 * 1024) << aper_order;
+ aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7;
+ aper_size = (32 * 1024 * 1024) << aper_order;
aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
- aper_base <<= 25;
+ aper_base <<= 25;
- printk("CPU %d: aperture @ %Lx size %u MB\n", num-24,
+ printk("CPU %d: aperture @ %Lx size %u MB\n", num-24,
aper_base, aper_size>>20);
-
+
if (!aperture_valid(aper_base, aper_size)) {
- fix = 1;
- break;
+ fix = 1;
+ break;
}
if ((last_aper_order && aper_order != last_aper_order) ||
}
last_aper_order = aper_order;
last_aper_base = aper_base;
- }
+ }
if (!fix && !fallback_aper_force) {
if (last_aper_base) {
unsigned long n = (32 * 1024 * 1024) << last_aper_order;
+
insert_aperture_resource((u32)last_aper_base, n);
}
- return;
+ return;
}
if (!fallback_aper_force)
- aper_alloc = search_agp_bridge(&aper_order, &valid_agp);
-
- if (aper_alloc) {
+ aper_alloc = search_agp_bridge(&aper_order, &valid_agp);
+
+ if (aper_alloc) {
/* Got the aperture from the AGP bridge */
} else if (swiotlb && !valid_agp) {
/* Do nothing */
} else if ((!no_iommu && end_pfn > MAX_DMA32_PFN) ||
force_iommu ||
valid_agp ||
- fallback_aper_force) {
+ fallback_aper_force) {
printk("Your BIOS doesn't leave a aperture memory hole\n");
printk("Please enable the IOMMU option in the BIOS setup\n");
printk("This costs you %d MB of RAM\n",
aper_order = fallback_aper_order;
aper_alloc = allocate_aperture();
- if (!aper_alloc) {
- /* Could disable AGP and IOMMU here, but it's probably
- not worth it. But the later users cannot deal with
- bad apertures and turning on the aperture over memory
- causes very strange problems, so it's better to
- panic early. */
+ if (!aper_alloc) {
+ /*
+ * Could disable AGP and IOMMU here, but it's
+ * probably not worth it. But the later users
+ * cannot deal with bad apertures and turning
+ * on the aperture over memory causes very
+ * strange problems, so it's better to panic
+ * early.
+ */
panic("Not enough memory for aperture");
}
- } else {
- return;
- }
+ } else {
+ return;
+ }
/* Fix up the north bridges */
- for (num = 24; num < 32; num++) {
+ for (num = 24; num < 32; num++) {
if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
- continue;
-
- /* Don't enable translation yet. That is done later.
- Assume this BIOS didn't initialise the GART so
- just overwrite all previous bits */
- write_pci_config(0, num, 3, 0x90, aper_order<<1);
- write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
- }
-}
+ continue;
+
+ /*
+ * Don't enable translation yet. That is done later.
+ * Assume this BIOS didn't initialise the GART so
+ * just overwrite all previous bits
+ */
+ write_pci_config(0, num, 3, 0x90, aper_order<<1);
+ write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
+ }
+}
projects / linux-2.6 / commitdiff