| Geoffrey Wossum | 9aaca96 | 2008-06-05 13:49:34 +0100 | [diff] [blame] | 1 | /* sound/soc/at32/at32-pcm.h |
| 2 | * ASoC PCM interface for Atmel AT32 SoC |
| 3 | * |
| 4 | * Copyright (C) 2008 Long Range Systems |
| 5 | * Geoffrey Wossum <gwossum@acm.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #ifndef __SOUND_SOC_AT32_AT32_PCM_H |
| 13 | #define __SOUND_SOC_AT32_AT32_PCM_H __FILE__ |
| 14 | |
| 15 | #include <linux/atmel-ssc.h> |
| 16 | |
| 17 | |
| 18 | /* |
| 19 | * Registers and status bits that are required by the PCM driver |
| 20 | * TODO: Is ptcr really used? |
| 21 | */ |
| 22 | struct at32_pdc_regs { |
| 23 | u32 xpr; /* PDC RX/TX pointer */ |
| 24 | u32 xcr; /* PDC RX/TX counter */ |
| 25 | u32 xnpr; /* PDC next RX/TX pointer */ |
| 26 | u32 xncr; /* PDC next RX/TX counter */ |
| 27 | u32 ptcr; /* PDC transfer control */ |
| 28 | }; |
| 29 | |
| 30 | |
| 31 | |
| 32 | /* |
| 33 | * SSC mask info |
| 34 | */ |
| 35 | struct at32_ssc_mask { |
| 36 | u32 ssc_enable; /* SSC RX/TX enable */ |
| 37 | u32 ssc_disable; /* SSC RX/TX disable */ |
| 38 | u32 ssc_endx; /* SSC ENDTX or ENDRX */ |
| 39 | u32 ssc_endbuf; /* SSC TXBUFF or RXBUFF */ |
| 40 | u32 pdc_enable; /* PDC RX/TX enable */ |
| 41 | u32 pdc_disable; /* PDC RX/TX disable */ |
| 42 | }; |
| 43 | |
| 44 | |
| 45 | |
| 46 | /* |
| 47 | * This structure, shared between the PCM driver and the interface, |
| 48 | * contains all information required by the PCM driver to perform the |
| 49 | * PDC DMA operation. All fields except dma_intr_handler() are initialized |
| 50 | * by the interface. The dms_intr_handler() pointer is set by the PCM |
| 51 | * driver and called by the interface SSC interrupt handler if it is |
| 52 | * non-NULL. |
| 53 | */ |
| 54 | struct at32_pcm_dma_params { |
| 55 | char *name; /* stream identifier */ |
| 56 | int pdc_xfer_size; /* PDC counter increment in bytes */ |
| 57 | struct ssc_device *ssc; /* SSC device for stream */ |
| 58 | struct at32_pdc_regs *pdc; /* PDC register info */ |
| 59 | struct at32_ssc_mask *mask; /* SSC mask info */ |
| 60 | struct snd_pcm_substream *substream; |
| 61 | void (*dma_intr_handler) (u32, struct snd_pcm_substream *); |
| 62 | }; |
| 63 | |
| 64 | |
| 65 | |
| 66 | /* |
| 67 | * The AT32 ASoC platform driver |
| 68 | */ |
| 69 | extern struct snd_soc_platform at32_soc_platform; |
| 70 | |
| 71 | |
| 72 | |
| 73 | /* |
| 74 | * SSC register access (since ssc_writel() / ssc_readl() require literal name) |
| 75 | */ |
| 76 | #define ssc_readx(base, reg) (__raw_readl((base) + (reg))) |
| 77 | #define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg)) |
| 78 | |
| 79 | #endif /* __SOUND_SOC_AT32_AT32_PCM_H */ |