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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/isdn/hardware/eicon/diva_dma.c |
Initial import
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 000000000..217b6aa9f --- /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); +} |