| Sedji Gaouaou | 6c74250 | 2008-10-03 16:57:50 +0200 | [diff] [blame] | 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 | |
| 77 | extern struct snd_soc_platform atmel_soc_platform; |
| 78 | |
| 79 | |
| 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 | |
| 86 | #endif /* _ATMEL_PCM_H */ |