Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * |
| 4 | Copyright (c) Eicon Networks, 2002. |
| 5 | * |
| 6 | This source file is supplied for the use with |
| 7 | Eicon Networks range of DIVA Server Adapters. |
| 8 | * |
| 9 | Eicon File Revision : 2.1 |
| 10 | * |
| 11 | This program is free software; you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation; either version 2, or (at your option) |
| 14 | any later version. |
| 15 | * |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY |
| 18 | implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 19 | See the GNU General Public License for more details. |
| 20 | * |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | * |
| 25 | */ |
| 26 | #include "platform.h" |
| 27 | #include "diva_dma.h" |
| 28 | /* |
| 29 | Every entry has length of PAGE_SIZE |
| 30 | and represents one single physical page |
| 31 | */ |
| 32 | struct _diva_dma_map_entry { |
| 33 | int busy; |
| 34 | dword phys_bus_addr; /* 32bit address as seen by the card */ |
| 35 | void* local_ram_addr; /* local address as seen by the host */ |
| 36 | void* addr_handle; /* handle uset to free allocated memory */ |
| 37 | }; |
| 38 | /* |
| 39 | Create local mapping structure and init it to default state |
| 40 | */ |
| 41 | struct _diva_dma_map_entry* diva_alloc_dma_map (void* os_context, int nentries) { |
| 42 | diva_dma_map_entry_t* pmap = diva_os_malloc(0, sizeof(*pmap)*(nentries+1)); |
| 43 | if (pmap) |
| 44 | memset (pmap, 0, sizeof(*pmap)*(nentries+1)); |
| 45 | return pmap; |
| 46 | } |
| 47 | /* |
| 48 | Free local map (context should be freed before) if any |
| 49 | */ |
| 50 | void diva_free_dma_mapping (struct _diva_dma_map_entry* pmap) { |
| 51 | if (pmap) { |
| 52 | diva_os_free (0, pmap); |
| 53 | } |
| 54 | } |
| 55 | /* |
| 56 | Set information saved on the map entry |
| 57 | */ |
| 58 | void diva_init_dma_map_entry (struct _diva_dma_map_entry* pmap, |
| 59 | int nr, void* virt, dword phys, |
| 60 | void* addr_handle) { |
| 61 | pmap[nr].phys_bus_addr = phys; |
| 62 | pmap[nr].local_ram_addr = virt; |
| 63 | pmap[nr].addr_handle = addr_handle; |
| 64 | } |
| 65 | /* |
| 66 | Allocate one single entry in the map |
| 67 | */ |
| 68 | int diva_alloc_dma_map_entry (struct _diva_dma_map_entry* pmap) { |
| 69 | int i; |
| 70 | for (i = 0; (pmap && pmap[i].local_ram_addr); i++) { |
| 71 | if (!pmap[i].busy) { |
| 72 | pmap[i].busy = 1; |
| 73 | return (i); |
| 74 | } |
| 75 | } |
| 76 | return (-1); |
| 77 | } |
| 78 | /* |
| 79 | Free one single entry in the map |
| 80 | */ |
| 81 | void diva_free_dma_map_entry (struct _diva_dma_map_entry* pmap, int nr) { |
| 82 | pmap[nr].busy = 0; |
| 83 | } |
| 84 | /* |
| 85 | Get information saved on the map entry |
| 86 | */ |
| 87 | void diva_get_dma_map_entry (struct _diva_dma_map_entry* pmap, int nr, |
| 88 | void** pvirt, dword* pphys) { |
| 89 | *pphys = pmap[nr].phys_bus_addr; |
| 90 | *pvirt = pmap[nr].local_ram_addr; |
| 91 | } |
| 92 | void* diva_get_entry_handle (struct _diva_dma_map_entry* pmap, int nr) { |
| 93 | return (pmap[nr].addr_handle); |
| 94 | } |