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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 | ||
92dfa619 BS |
39 | #define ATMEL_SSC_DMABUF_SIZE (64 * 1024) |
40 | ||
6c742509 SG |
41 | /* |
42 | * Registers and status bits that are required by the PCM driver. | |
43 | */ | |
44 | struct atmel_pdc_regs { | |
45 | unsigned int xpr; /* PDC recv/trans pointer */ | |
46 | unsigned int xcr; /* PDC recv/trans counter */ | |
47 | unsigned int xnpr; /* PDC next recv/trans pointer */ | |
48 | unsigned int xncr; /* PDC next recv/trans counter */ | |
49 | unsigned int ptcr; /* PDC transfer control */ | |
50 | }; | |
51 | ||
52 | struct atmel_ssc_mask { | |
53 | u32 ssc_enable; /* SSC recv/trans enable */ | |
54 | u32 ssc_disable; /* SSC recv/trans disable */ | |
3951e4aa | 55 | u32 ssc_error; /* SSC error conditions */ |
6c742509 SG |
56 | u32 ssc_endx; /* SSC ENDTX or ENDRX */ |
57 | u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */ | |
58 | u32 pdc_enable; /* PDC recv/trans enable */ | |
59 | u32 pdc_disable; /* PDC recv/trans disable */ | |
60 | }; | |
61 | ||
62 | /* | |
63 | * This structure, shared between the PCM driver and the interface, | |
64 | * contains all information required by the PCM driver to perform the | |
65 | * PDC DMA operation. All fields except dma_intr_handler() are initialized | |
97b4fc3c | 66 | * by the interface. The dma_intr_handler() pointer is set by the PCM |
6c742509 SG |
67 | * driver and called by the interface SSC interrupt handler if it is |
68 | * non-NULL. | |
69 | */ | |
70 | struct atmel_pcm_dma_params { | |
71 | char *name; /* stream identifier */ | |
72 | int pdc_xfer_size; /* PDC counter increment in bytes */ | |
73 | struct ssc_device *ssc; /* SSC device for stream */ | |
74 | struct atmel_pdc_regs *pdc; /* PDC receive or transmit registers */ | |
75 | struct atmel_ssc_mask *mask; /* SSC & PDC status bits */ | |
76 | struct snd_pcm_substream *substream; | |
77 | void (*dma_intr_handler)(u32, struct snd_pcm_substream *); | |
78 | }; | |
79 | ||
6c742509 SG |
80 | /* |
81 | * SSC register access (since ssc_writel() / ssc_readl() require literal name) | |
82 | */ | |
83 | #define ssc_readx(base, reg) (__raw_readl((base) + (reg))) | |
84 | #define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg)) | |
85 | ||
d8976cfd BS |
86 | #if defined(CONFIG_SND_ATMEL_SOC_PDC) || \ |
87 | defined(CONFIG_SND_ATMEL_SOC_PDC_MODULE) | |
92dfa619 BS |
88 | int atmel_pcm_pdc_platform_register(struct device *dev); |
89 | void atmel_pcm_pdc_platform_unregister(struct device *dev); | |
90 | #else | |
91 | static inline int atmel_pcm_pdc_platform_register(struct device *dev) | |
92 | { | |
93 | return 0; | |
94 | } | |
95 | static inline void atmel_pcm_pdc_platform_unregister(struct device *dev) | |
96 | { | |
97 | } | |
98 | #endif | |
be681a82 | 99 | |
d8976cfd BS |
100 | #if defined(CONFIG_SND_ATMEL_SOC_DMA) || \ |
101 | defined(CONFIG_SND_ATMEL_SOC_DMA_MODULE) | |
3951e4aa BS |
102 | int atmel_pcm_dma_platform_register(struct device *dev); |
103 | void atmel_pcm_dma_platform_unregister(struct device *dev); | |
104 | #else | |
105 | static inline int atmel_pcm_dma_platform_register(struct device *dev) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | static inline void atmel_pcm_dma_platform_unregister(struct device *dev) | |
110 | { | |
111 | } | |
112 | #endif | |
113 | ||
6c742509 | 114 | #endif /* _ATMEL_PCM_H */ |