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1 /*
2  * chnl.c
3  *
4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
5  *
6  * DSP API channel interface: multiplexes data streams through the single
7  * physical link managed by a Bridge Bridge driver.
8  *
9  * Copyright (C) 2005-2006 Texas Instruments, Inc.
10  *
11  * This package is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License version 2 as
13  * published by the Free Software Foundation.
14  *
15  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18  */
19 
20 #include <linux/types.h>
21 /*  ----------------------------------- Host OS */
22 #include <dspbridge/host_os.h>
23 
24 /*  ----------------------------------- DSP/BIOS Bridge */
25 #include <dspbridge/dbdefs.h>
26 
27 /*  ----------------------------------- OS Adaptation Layer */
28 #include <dspbridge/sync.h>
29 
30 /*  ----------------------------------- Platform Manager */
31 #include <dspbridge/proc.h>
32 #include <dspbridge/dev.h>
33 
34 /*  ----------------------------------- Others */
35 #include <dspbridge/chnlpriv.h>
36 #include <chnlobj.h>
37 
38 /*  ----------------------------------- This */
39 #include <dspbridge/chnl.h>
40 
41 /*
42  *  ======== chnl_create ========
43  *  Purpose:
44  *      Create a channel manager object, responsible for opening new channels
45  *      and closing old ones for a given 'Bridge board.
46  */
chnl_create(struct chnl_mgr ** channel_mgr,struct dev_object * hdev_obj,const struct chnl_mgrattrs * mgr_attrts)47 int chnl_create(struct chnl_mgr **channel_mgr,
48 		       struct dev_object *hdev_obj,
49 		       const struct chnl_mgrattrs *mgr_attrts)
50 {
51 	int status;
52 	struct chnl_mgr *hchnl_mgr;
53 	struct chnl_mgr_ *chnl_mgr_obj = NULL;
54 
55 	*channel_mgr = NULL;
56 
57 	/* Validate args: */
58 	if ((0 < mgr_attrts->max_channels) &&
59 	    (mgr_attrts->max_channels <= CHNL_MAXCHANNELS))
60 		status = 0;
61 	else if (mgr_attrts->max_channels == 0)
62 		status = -EINVAL;
63 	else
64 		status = -ECHRNG;
65 
66 	if (mgr_attrts->word_size == 0)
67 		status = -EINVAL;
68 
69 	if (!status) {
70 		status = dev_get_chnl_mgr(hdev_obj, &hchnl_mgr);
71 		if (!status && hchnl_mgr != NULL)
72 			status = -EEXIST;
73 
74 	}
75 
76 	if (!status) {
77 		struct bridge_drv_interface *intf_fxns;
78 		dev_get_intf_fxns(hdev_obj, &intf_fxns);
79 		/* Let Bridge channel module finish the create: */
80 		status = (*intf_fxns->chnl_create) (&hchnl_mgr, hdev_obj,
81 							mgr_attrts);
82 		if (!status) {
83 			/* Fill in DSP API channel module's fields of the
84 			 * chnl_mgr structure */
85 			chnl_mgr_obj = (struct chnl_mgr_ *)hchnl_mgr;
86 			chnl_mgr_obj->intf_fxns = intf_fxns;
87 			/* Finally, return the new channel manager handle: */
88 			*channel_mgr = hchnl_mgr;
89 		}
90 	}
91 
92 	return status;
93 }
94 
95 /*
96  *  ======== chnl_destroy ========
97  *  Purpose:
98  *      Close all open channels, and destroy the channel manager.
99  */
chnl_destroy(struct chnl_mgr * hchnl_mgr)100 int chnl_destroy(struct chnl_mgr *hchnl_mgr)
101 {
102 	struct chnl_mgr_ *chnl_mgr_obj = (struct chnl_mgr_ *)hchnl_mgr;
103 	struct bridge_drv_interface *intf_fxns;
104 	int status;
105 
106 	if (chnl_mgr_obj) {
107 		intf_fxns = chnl_mgr_obj->intf_fxns;
108 		/* Let Bridge channel module destroy the chnl_mgr: */
109 		status = (*intf_fxns->chnl_destroy) (hchnl_mgr);
110 	} else {
111 		status = -EFAULT;
112 	}
113 
114 	return status;
115 }
116