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Enable a few more bus_space functions. 

If a region is outside the regular obio space in obio_bs_map(), create
mappings for it.
This commit is contained in:
briggs 2003-01-02 23:04:08 +00:00
parent 9f57359336
commit 147ab60754
1 changed files with 44 additions and 9 deletions
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53
sys/arch/evbarm/iq80321/obio_space.c
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@ -1,4 +1,4 @@
/* $NetBSD: obio_space.c,v 1.3 2002/09/27 15:36:01 provos Exp $ */
/* $NetBSD: obio_space.c,v 1.4 2003/01/02 23:04:08 briggs Exp $ */
/*
* Copyright (c) 2001, 2002 Wasabi Systems, Inc.
@ -46,9 +46,12 @@
#include <machine/bus.h>
#include "iq80321reg.h"
/* Prototypes for all the bus_space structure functions */
bs_protos(obio);
bs_protos(generic);
bs_protos(generic_armv4);
bs_protos(bs_notimpl);
/*
@ -79,7 +82,7 @@ struct bus_space obio_bs_tag = {
/* read (single) */
generic_bs_r_1,
bs_notimpl_bs_r_2,
generic_armv4_bs_r_2,
generic_bs_r_4,
bs_notimpl_bs_r_8,
@ -90,14 +93,14 @@ struct bus_space obio_bs_tag = {
bs_notimpl_bs_rm_8,
/* read region */
bs_notimpl_bs_rr_1,
generic_bs_rr_1,
bs_notimpl_bs_rr_2,
bs_notimpl_bs_rr_4,
bs_notimpl_bs_rr_8,
/* write (single) */
generic_bs_w_1,
bs_notimpl_bs_w_2,
generic_armv4_bs_w_2,
generic_bs_w_4,
bs_notimpl_bs_w_8,
@ -136,12 +139,41 @@ int
obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
bus_space_handle_t *bshp)
{
uint32_t startpa, endpa, pa;
vaddr_t va;
pt_entry_t *pte;
/*
* IQ80321 on-board devices are mapped VA==PA. All addresses
* we're provided, therefore, don't need any additional mapping.
*/
*bshp = bpa;
if (bpa > IQ80321_IOPXS_VBASE) {
/*
* IQ80321 on-board devices are mapped VA==PA. All
* addresses we're provided, therefore, don't need
* any additional mapping.
*/
*bshp = bpa;
} else {
/*
* Some devices, however, may lie outside the
* already-mapped space (notably flash).
*/
startpa = trunc_page(bpa);
endpa = round_page(bpa + size);
/* XXX use some extent to check for duplicate mappings? */
va = uvm_km_valloc(kernel_map, endpa - startpa);
if (! va)
return ENOMEM;
*bshp = (bus_space_handle_t) (va + (bpa - startpa));
for (pa=startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE);
pte = vtopte(va);
*pte &= ~L2_S_CACHE_MASK;
PTE_SYNC(pte);
}
pmap_update(pmap_kernel());
}
return 0;
}
@ -161,6 +193,9 @@ obio_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
{
/* Nothing to do. */
/* XXX -- technically, if we alloc and map above, we should
* unmap and free here, but we bail on this for now.
*/
}
void