/* * at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC. * * Copyright (C) 2005 SAN People * Copyright (C) 2008 Atmel * * Authors: Sedji Gaouaou * * Based on at91-pcm. by: * Frank Mandarino * Copyright 2006 Endrelia Technologies Inc. * * Based on pxa2xx-pcm.c by: * * Author: Nicolas Pitre * Created: Nov 30, 2004 * Copyright: (C) 2004 MontaVista Software, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _ATMEL_PCM_H #define _ATMEL_PCM_H #include /* * Registers and status bits that are required by the PCM driver. */ struct atmel_pdc_regs { unsigned int xpr; /* PDC recv/trans pointer */ unsigned int xcr; /* PDC recv/trans counter */ unsigned int xnpr; /* PDC next recv/trans pointer */ unsigned int xncr; /* PDC next recv/trans counter */ unsigned int ptcr; /* PDC transfer control */ }; struct atmel_ssc_mask { u32 ssc_enable; /* SSC recv/trans enable */ u32 ssc_disable; /* SSC recv/trans disable */ u32 ssc_endx; /* SSC ENDTX or ENDRX */ u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */ u32 pdc_enable; /* PDC recv/trans enable */ u32 pdc_disable; /* PDC recv/trans disable */ }; /* * This structure, shared between the PCM driver and the interface, * contains all information required by the PCM driver to perform the * PDC DMA operation. All fields except dma_intr_handler() are initialized * by the interface. The dma_intr_handler() pointer is set by the PCM * driver and called by the interface SSC interrupt handler if it is * non-NULL. */ struct atmel_pcm_dma_params { char *name; /* stream identifier */ int pdc_xfer_size; /* PDC counter increment in bytes */ struct ssc_device *ssc; /* SSC device for stream */ struct atmel_pdc_regs *pdc; /* PDC receive or transmit registers */ struct atmel_ssc_mask *mask; /* SSC & PDC status bits */ struct snd_pcm_substream *substream; void (*dma_intr_handler)(u32, struct snd_pcm_substream *); }; /* * SSC register access (since ssc_writel() / ssc_readl() require literal name) */ #define ssc_readx(base, reg) (__raw_readl((base) + (reg))) #define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg)) int atmel_pcm_platform_register(struct device *dev); void atmel_pcm_platform_unregister(struct device *dev); #endif /* _ATMEL_PCM_H */