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 00000000..217b6aa9
--- /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);
+}