2 * at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC
4 * Author: Frank Mandarino <fmandarino@endrelia.com>
5 * Endrelia Technologies Inc.
8 * Based on pxa2xx-pcm.h by:
10 * Author: Nicolas Pitre
11 * Created: Nov 30, 2004
12 * Copyright: MontaVista Software, Inc.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 #include <asm/arch/hardware.h>
21 struct at91_ssc_periph {
28 * Registers and status bits that are required by the PCM driver.
30 struct at91_pdc_regs {
31 unsigned int xpr; /* PDC recv/trans pointer */
32 unsigned int xcr; /* PDC recv/trans counter */
33 unsigned int xnpr; /* PDC next recv/trans pointer */
34 unsigned int xncr; /* PDC next recv/trans counter */
35 unsigned int ptcr; /* PDC transfer control */
38 struct at91_ssc_mask {
39 u32 ssc_enable; /* SSC recv/trans enable */
40 u32 ssc_disable; /* SSC recv/trans disable */
41 u32 ssc_endx; /* SSC ENDTX or ENDRX */
42 u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */
43 u32 pdc_enable; /* PDC recv/trans enable */
44 u32 pdc_disable; /* PDC recv/trans disable */
49 * This structure, shared between the PCM driver and the interface,
50 * contains all information required by the PCM driver to perform the
51 * PDC DMA operation. All fields except dma_intr_handler() are initialized
52 * by the interface. The dms_intr_handler() pointer is set by the PCM
53 * driver and called by the interface SSC interrupt handler if it is
56 struct at91_pcm_dma_params {
57 char *name; /* stream identifier */
58 int pdc_xfer_size; /* PDC counter increment in bytes */
59 void __iomem *ssc_base; /* SSC base address */
60 struct at91_pdc_regs *pdc; /* PDC receive or transmit registers */
61 struct at91_ssc_mask *mask;/* SSC & PDC status bits */
62 struct snd_pcm_substream *substream;
63 void (*dma_intr_handler)(u32, struct snd_pcm_substream *);
66 extern struct snd_soc_cpu_dai at91_i2s_dai[3];
67 extern struct snd_soc_platform at91_soc_platform;
70 #define at91_ssc_read(a) ((unsigned long) __raw_readl(a))
71 #define at91_ssc_write(a,v) __raw_writel((v),(a))