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6c742509 SG |
1 | /* |
2 | * at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC. | |
3 | * | |
4 | * Copyright (C) 2005 SAN People | |
5 | * Copyright (C) 2008 Atmel | |
6 | * | |
7 | * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> | |
8 | * | |
9 | * Based on at91-pcm. by: | |
10 | * Frank Mandarino <fmandarino@endrelia.com> | |
11 | * Copyright 2006 Endrelia Technologies Inc. | |
12 | * | |
13 | * Based on pxa2xx-pcm.c by: | |
14 | * | |
15 | * Author: Nicolas Pitre | |
16 | * Created: Nov 30, 2004 | |
17 | * Copyright: (C) 2004 MontaVista Software, Inc. | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
32 | */ | |
33 | ||
34 | #ifndef _ATMEL_PCM_H | |
35 | #define _ATMEL_PCM_H | |
36 | ||
37 | #include <linux/atmel-ssc.h> | |
38 | ||
39 | /* | |
40 | * Registers and status bits that are required by the PCM driver. | |
41 | */ | |
42 | struct atmel_pdc_regs { | |
43 | unsigned int xpr; /* PDC recv/trans pointer */ | |
44 | unsigned int xcr; /* PDC recv/trans counter */ | |
45 | unsigned int xnpr; /* PDC next recv/trans pointer */ | |
46 | unsigned int xncr; /* PDC next recv/trans counter */ | |
47 | unsigned int ptcr; /* PDC transfer control */ | |
48 | }; | |
49 | ||
50 | struct atmel_ssc_mask { | |
51 | u32 ssc_enable; /* SSC recv/trans enable */ | |
52 | u32 ssc_disable; /* SSC recv/trans disable */ | |
53 | u32 ssc_endx; /* SSC ENDTX or ENDRX */ | |
54 | u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */ | |
55 | u32 pdc_enable; /* PDC recv/trans enable */ | |
56 | u32 pdc_disable; /* PDC recv/trans disable */ | |
57 | }; | |
58 | ||
59 | /* | |
60 | * This structure, shared between the PCM driver and the interface, | |
61 | * contains all information required by the PCM driver to perform the | |
62 | * PDC DMA operation. All fields except dma_intr_handler() are initialized | |
63 | * by the interface. The dms_intr_handler() pointer is set by the PCM | |
64 | * driver and called by the interface SSC interrupt handler if it is | |
65 | * non-NULL. | |
66 | */ | |
67 | struct atmel_pcm_dma_params { | |
68 | char *name; /* stream identifier */ | |
69 | int pdc_xfer_size; /* PDC counter increment in bytes */ | |
70 | struct ssc_device *ssc; /* SSC device for stream */ | |
71 | struct atmel_pdc_regs *pdc; /* PDC receive or transmit registers */ | |
72 | struct atmel_ssc_mask *mask; /* SSC & PDC status bits */ | |
73 | struct snd_pcm_substream *substream; | |
74 | void (*dma_intr_handler)(u32, struct snd_pcm_substream *); | |
75 | }; | |
76 | ||
6c742509 SG |
77 | /* |
78 | * SSC register access (since ssc_writel() / ssc_readl() require literal name) | |
79 | */ | |
80 | #define ssc_readx(base, reg) (__raw_readl((base) + (reg))) | |
81 | #define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg)) | |
82 | ||
83 | #endif /* _ATMEL_PCM_H */ |