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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/isdn/hardware/eicon/diva_dma.c | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/isdn/hardware/eicon/diva_dma.c')
-rw-r--r-- | drivers/isdn/hardware/eicon/diva_dma.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/eicon/diva_dma.c b/drivers/isdn/hardware/eicon/diva_dma.c new file mode 100644 index 0000000..f53a740 --- /dev/null +++ b/drivers/isdn/hardware/eicon/diva_dma.c @@ -0,0 +1,94 @@ + +/* + * + Copyright (c) Eicon Networks, 2002. + * + This source file is supplied for the use with + Eicon Networks range of DIVA Server Adapters. + * + Eicon File Revision : 2.1 + * + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + * + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY + implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU General Public License for more details. + * + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ +#include "platform.h" +#include "diva_dma.h" +/* + Every entry has length of PAGE_SIZE + and represents one single physical page + */ +struct _diva_dma_map_entry { + int busy; + dword phys_bus_addr; /* 32bit address as seen by the card */ + void* local_ram_addr; /* local address as seen by the host */ + void* addr_handle; /* handle uset to free allocated memory */ +}; +/* + Create local mapping structure and init it to default state + */ +struct _diva_dma_map_entry* diva_alloc_dma_map (void* os_context, int nentries) { + diva_dma_map_entry_t* pmap = diva_os_malloc(0, sizeof(*pmap)*(nentries+1)); + if (pmap) + memset (pmap, 0, sizeof(*pmap)*(nentries+1)); + return pmap; +} +/* + Free local map (context should be freed before) if any + */ +void diva_free_dma_mapping (struct _diva_dma_map_entry* pmap) { + if (pmap) { + diva_os_free (0, pmap); + } +} +/* + Set information saved on the map entry + */ +void diva_init_dma_map_entry (struct _diva_dma_map_entry* pmap, + int nr, void* virt, dword phys, + void* addr_handle) { + pmap[nr].phys_bus_addr = phys; + pmap[nr].local_ram_addr = virt; + pmap[nr].addr_handle = addr_handle; +} +/* + Allocate one single entry in the map + */ +int diva_alloc_dma_map_entry (struct _diva_dma_map_entry* pmap) { + int i; + for (i = 0; (pmap && pmap[i].local_ram_addr); i++) { + if (!pmap[i].busy) { + pmap[i].busy = 1; + return (i); + } + } + return (-1); +} +/* + Free one single entry in the map + */ +void diva_free_dma_map_entry (struct _diva_dma_map_entry* pmap, int nr) { + pmap[nr].busy = 0; +} +/* + Get information saved on the map entry + */ +void diva_get_dma_map_entry (struct _diva_dma_map_entry* pmap, int nr, + void** pvirt, dword* pphys) { + *pphys = pmap[nr].phys_bus_addr; + *pvirt = pmap[nr].local_ram_addr; +} +void* diva_get_entry_handle (struct _diva_dma_map_entry* pmap, int nr) { + return (pmap[nr].addr_handle); +} |