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[POWERPC] U4 DART improvements

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Better late than never...

Respin based on previous comment. Only remaining issue last time was an
extra mb() that I've taken out.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olof Johansson 2006-06-28 02:50:36 -07:00 committed by Paul Mackerras
parent c220153654
commit feb76c7b23
2 changed files with 48 additions and 7 deletions
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6
arch/powerpc/sysdev/dart.h
View file

@ -47,8 +47,12 @@
/* U4 registers */
#define DART_BASE_U4_BASE_MASK 0xffffff
#define DART_BASE_U4_BASE_SHIFT 0
#define DART_CNTL_U4_FLUSHTLB 0x20000000
#define DART_CNTL_U4_ENABLE 0x80000000
#define DART_CNTL_U4_IONE 0x40000000
#define DART_CNTL_U4_FLUSHTLB 0x20000000
#define DART_CNTL_U4_IDLE 0x10000000
#define DART_CNTL_U4_PAR_EN 0x08000000
#define DART_CNTL_U4_IONE_MASK 0x07ffffff
#define DART_SIZE_U4_SIZE_MASK 0x1fff
#define DART_SIZE_U4_SIZE_SHIFT 0

49
arch/powerpc/sysdev/dart_iommu.c
View file

@ -101,8 +101,8 @@ static inline void dart_tlb_invalidate_all(void)
if (l == (1L << limit)) {
if (limit < 4) {
limit++;
reg = DART_IN(DART_CNTL);
reg &= ~inv_bit;
reg = DART_IN(DART_CNTL);
reg &= ~inv_bit;
DART_OUT(DART_CNTL, reg);
goto retry;
} else
@ -111,11 +111,39 @@ static inline void dart_tlb_invalidate_all(void)
}
}
static inline void dart_tlb_invalidate_one(unsigned long bus_rpn)
{
unsigned int reg;
unsigned int l, limit;
reg = DART_CNTL_U4_ENABLE | DART_CNTL_U4_IONE |
(bus_rpn & DART_CNTL_U4_IONE_MASK);
DART_OUT(DART_CNTL, reg);
limit = 0;
wait_more:
l = 0;
while ((DART_IN(DART_CNTL) & DART_CNTL_U4_IONE) && l < (1L << limit)) {
rmb();
l++;
}
if (l == (1L << limit)) {
if (limit < 4) {
limit++;
goto wait_more;
} else
panic("DART: TLB did not flush after waiting a long "
"time. Buggy U4 ?");
}
}
static void dart_flush(struct iommu_table *tbl)
{
if (dart_dirty)
if (dart_dirty) {
dart_tlb_invalidate_all();
dart_dirty = 0;
dart_dirty = 0;
}
}
static void dart_build(struct iommu_table *tbl, long index,
@ -124,6 +152,7 @@ static void dart_build(struct iommu_table *tbl, long index,
{
unsigned int *dp;
unsigned int rpn;
long l;
DBG("dart: build at: %lx, %lx, addr: %x\n", index, npages, uaddr);
@ -135,7 +164,8 @@ static void dart_build(struct iommu_table *tbl, long index,
/* On U3, all memory is contigous, so we can move this
* out of the loop.
*/
while (npages--) {
l = npages;
while (l--) {
rpn = virt_to_abs(uaddr) >> DART_PAGE_SHIFT;
*(dp++) = DARTMAP_VALID | (rpn & DARTMAP_RPNMASK);
@ -143,7 +173,14 @@ static void dart_build(struct iommu_table *tbl, long index,
uaddr += DART_PAGE_SIZE;
}
dart_dirty = 1;
if (dart_is_u4) {
rpn = index;
mb(); /* make sure all updates have reached memory */
while (npages--)
dart_tlb_invalidate_one(rpn++);
} else {
dart_dirty = 1;
}
}