1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Support for Intel Camera Imaging ISP subsystem.
4  * Copyright (c) 2010 - 2015, Intel Corporation.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  */
15 
16 #include "system_global.h"
17 
18 
19 #include "assert_support.h"
20 #include "platform_support.h"
21 #include "ia_css_isys.h"
22 #include "bitop_support.h"
23 #include "isys_dma_rmgr.h"
24 
25 static isys_dma_rsrc_t isys_dma_rsrc[N_ISYS2401_DMA_ID];
26 
27 void ia_css_isys_dma_channel_rmgr_init(void)
28 {
29 	memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
30 }
31 
32 void ia_css_isys_dma_channel_rmgr_uninit(void)
33 {
34 	memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
35 }
36 
37 bool ia_css_isys_dma_channel_rmgr_acquire(
38     isys2401_dma_ID_t	dma_id,
39     isys2401_dma_channel	*channel)
40 {
41 	bool retval = false;
42 	isys2401_dma_channel	i;
43 	isys2401_dma_channel	max_dma_channel;
44 	isys_dma_rsrc_t		*cur_rsrc = NULL;
45 
46 	assert(dma_id < N_ISYS2401_DMA_ID);
47 	assert(channel);
48 
49 	max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
50 	cur_rsrc = &isys_dma_rsrc[dma_id];
51 
52 	if (cur_rsrc->num_active < max_dma_channel) {
53 		for (i = ISYS2401_DMA_CHANNEL_0; i < N_ISYS2401_DMA_CHANNEL; i++) {
54 			if (bitop_getbit(cur_rsrc->active_table, i) == 0) {
55 				bitop_setbit(cur_rsrc->active_table, i);
56 				*channel = i;
57 				cur_rsrc->num_active++;
58 				retval = true;
59 				break;
60 			}
61 		}
62 	}
63 
64 	return retval;
65 }
66 
67 void ia_css_isys_dma_channel_rmgr_release(
68     isys2401_dma_ID_t	dma_id,
69     isys2401_dma_channel	*channel)
70 {
71 	isys2401_dma_channel	max_dma_channel;
72 	isys_dma_rsrc_t		*cur_rsrc = NULL;
73 
74 	assert(dma_id < N_ISYS2401_DMA_ID);
75 	assert(channel);
76 
77 	max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
78 	cur_rsrc = &isys_dma_rsrc[dma_id];
79 
80 	if ((*channel < max_dma_channel) && (cur_rsrc->num_active > 0)) {
81 		if (bitop_getbit(cur_rsrc->active_table, *channel) == 1) {
82 			bitop_clearbit(cur_rsrc->active_table, *channel);
83 			cur_rsrc->num_active--;
84 		}
85 	}
86 }
87