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);
+}