Commit 1fb62ea2 authored by Ivan Kokshaysky's avatar Ivan Kokshaysky Committed by Linus Torvalds

[PATCH] alpha: cia-1 fix [5/10]

From Jay Estabrook:
CIA rev 1 can't use DAC and windows 1,2 for SG.
parent a63ab460
...@@ -370,7 +370,7 @@ cia_pci_tbi_try2(struct pci_controller *hose, ...@@ -370,7 +370,7 @@ cia_pci_tbi_try2(struct pci_controller *hose,
} }
static inline void static inline void
cia_prepare_tbia_workaround(void) cia_prepare_tbia_workaround(int cia_rev, int is_pyxis)
{ {
unsigned long *ppte, pte; unsigned long *ppte, pte;
long i; long i;
...@@ -382,10 +382,20 @@ cia_prepare_tbia_workaround(void) ...@@ -382,10 +382,20 @@ cia_prepare_tbia_workaround(void)
for (i = 0; i < CIA_BROKEN_TBIA_SIZE / sizeof(unsigned long); ++i) for (i = 0; i < CIA_BROKEN_TBIA_SIZE / sizeof(unsigned long); ++i)
ppte[i] = pte; ppte[i] = pte;
if (is_pyxis || cia_rev != 1) {
/* We can use W1 for SG on PYXIS/CIA rev 2. */
*(vip)CIA_IOC_PCI_W1_BASE = CIA_BROKEN_TBIA_BASE | 3; *(vip)CIA_IOC_PCI_W1_BASE = CIA_BROKEN_TBIA_BASE | 3;
*(vip)CIA_IOC_PCI_W1_MASK = (CIA_BROKEN_TBIA_SIZE*1024 - 1) *(vip)CIA_IOC_PCI_W1_MASK = (CIA_BROKEN_TBIA_SIZE*1024 - 1)
& 0xfff00000; & 0xfff00000;
*(vip)CIA_IOC_PCI_T1_BASE = virt_to_phys(ppte) >> 2; *(vip)CIA_IOC_PCI_T1_BASE = virt_to_phys(ppte) >> 2;
} else {
/* CIA rev 1 can't use W1 or W2 for SG, apparently,
so use W3, which we made sure is not used for DAC. */
*(vip)CIA_IOC_PCI_W3_BASE = CIA_BROKEN_TBIA_BASE | 3;
*(vip)CIA_IOC_PCI_W3_MASK = (CIA_BROKEN_TBIA_SIZE*1024 - 1)
& 0xfff00000;
*(vip)CIA_IOC_PCI_T3_BASE = virt_to_phys(ppte) >> 2;
}
} }
static void __init static void __init
...@@ -684,10 +694,10 @@ do_init_arch(int is_pyxis) ...@@ -684,10 +694,10 @@ do_init_arch(int is_pyxis)
/* /*
* Set up the PCI to main memory translation windows. * Set up the PCI to main memory translation windows.
* *
* Window 0 is scatter-gather 8MB at 8MB (for isa) * Window 0 is S/G 8MB at 8MB (for isa)
* Window 1 is scatter-gather 1MB at 768MB (for tbia) * Window 1 is S/G 1MB at 768MB (for tbia) (unused for CIA rev 1)
* Window 2 is direct access 2GB at 2GB * Window 2 is direct access 2GB at 2GB
* Window 3 is DAC access 4GB at 8GB * Window 3 is DAC access 4GB at 8GB (or S/G for tbia if CIA rev 1)
* *
* ??? NetBSD hints that page tables must be aligned to 32K, * ??? NetBSD hints that page tables must be aligned to 32K,
* possibly due to a hardware bug. This is over-aligned * possibly due to a hardware bug. This is over-aligned
...@@ -697,6 +707,7 @@ do_init_arch(int is_pyxis) ...@@ -697,6 +707,7 @@ do_init_arch(int is_pyxis)
hose->sg_pci = NULL; hose->sg_pci = NULL;
hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 32768); hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 32768);
__direct_map_base = 0x80000000; __direct_map_base = 0x80000000;
__direct_map_size = 0x80000000; __direct_map_size = 0x80000000;
...@@ -715,8 +726,14 @@ do_init_arch(int is_pyxis) ...@@ -715,8 +726,14 @@ do_init_arch(int is_pyxis)
are compared against W_DAC. We can, however, directly map 4GB, are compared against W_DAC. We can, however, directly map 4GB,
which is better than before. However, due to assumptions made which is better than before. However, due to assumptions made
elsewhere, we should not claim that we support DAC unless that elsewhere, we should not claim that we support DAC unless that
4GB covers all of physical memory. */ 4GB covers all of physical memory.
if (is_pyxis || max_low_pfn > (0x100000000 >> PAGE_SHIFT)) {
Also, don't do DAC on CIA rev 1, it has other problems and is
unlikely to have more than 2GB of memory anyway, so direct is
fine.
*/
if (cia_rev == 1 || is_pyxis ||
max_low_pfn > (0x100000000UL >> PAGE_SHIFT)) {
*(vip)CIA_IOC_PCI_W3_BASE = 0; *(vip)CIA_IOC_PCI_W3_BASE = 0;
} else { } else {
*(vip)CIA_IOC_PCI_W3_BASE = 0x00000000 | 1 | 8; *(vip)CIA_IOC_PCI_W3_BASE = 0x00000000 | 1 | 8;
...@@ -728,7 +745,7 @@ do_init_arch(int is_pyxis) ...@@ -728,7 +745,7 @@ do_init_arch(int is_pyxis)
} }
/* Prepare workaround for apparently broken tbia. */ /* Prepare workaround for apparently broken tbia. */
cia_prepare_tbia_workaround(); cia_prepare_tbia_workaround(cia_rev, is_pyxis);
} }
void __init void __init
......
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