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[Blackfin] arch: fix bug - Make the MPU code aware of the async banks and the uncached DMA area. 

Bug: CONFIG_MPU doesn't seem to handle access to ASYNC/IO Memory well
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3912

Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Bernd Schmidt 2008-04-23 07:26:23 +08:00 committed by Bryan Wu
parent 2a0c4fdb66
commit b4bb68f7d0
1 changed files with 27 additions and 19 deletions
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46
arch/blackfin/kernel/cplb-mpu/cplbmgr.c
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@ -143,30 +143,39 @@ static noinline int dcplb_miss(void)
unsigned long d_data;
nr_dcplb_miss++;
if (addr >= _ramend)
return CPLB_PROT_VIOL;
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_DCACHE
d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
if (addr < _ramend - DMA_UNCACHED_REGION) {
d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#ifdef CONFIG_BFIN_WT
d_data |= CPLB_L1_AOW | CPLB_WT;
d_data |= CPLB_L1_AOW | CPLB_WT;
#endif
#endif
mask = current_rwx_mask;
if (mask) {
int page = addr >> PAGE_SHIFT;
int offs = page >> 5;
int bit = 1 << (page & 31);
if (mask[offs] & bit)
d_data |= CPLB_USER_RD;
mask += page_mask_nelts;
if (mask[offs] & bit)
d_data |= CPLB_USER_WR;
}
#endif
if (addr >= _ramend) {
if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE
&& (status & FAULT_USERSUPV)) {
addr &= ~0x3fffff;
d_data &= ~PAGE_SIZE_4KB;
d_data |= PAGE_SIZE_4MB;
} else
return CPLB_PROT_VIOL;
} else {
mask = current_rwx_mask;
if (mask) {
int page = addr >> PAGE_SHIFT;
int offs = page >> 5;
int bit = 1 << (page & 31);
if (mask[offs] & bit)
d_data |= CPLB_USER_RD;
mask += page_mask_nelts;
if (mask[offs] & bit)
d_data |= CPLB_USER_WR;
}
}
idx = evict_one_dcplb();
addr &= PAGE_MASK;
@ -280,8 +289,7 @@ int cplb_hdr(int seqstat, struct pt_regs *regs)
case 0x26:
return dcplb_miss();
default:
return 1;
panic_cplb_error(seqstat, regs);
return 1;
}
}