Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/soc/atmel/atmel-pcm.h
10817 views
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 <[email protected]>

8
 *

9
 * Based on at91-pcm. by:

10
 * Frank Mandarino <[email protected]>

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


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 */

84


85