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Diffstat (limited to 'drivers/isdn/hardware/eicon/diva_dma.c')
-rw-r--r--drivers/isdn/hardware/eicon/diva_dma.c94
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 000000000000..f53a7407605f
--- /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);
+}