include/minix/audio_fw.h

   1 #ifndef AUDIO_FW_H
   2 #define AUDIO_FW_H
   3
   4 #include <minix/drivers.h>
   5 #include <minix/chardriver.h>
   6 #include <sys/ioc_sound.h>
   7
   8
   9 int drv_init(void);
  10 int drv_init_hw(void);
  11 int drv_reset(void);
  12 int drv_start(int sub_dev, int DmaMode);
  13 int drv_stop(int sub_dev);
  14 int drv_set_dma(u32_t dma, u32_t length, int chan);
  15 int drv_reenable_int(int chan);
  16 int drv_int_sum(void);
  17 int drv_int(int sub_dev);
  18 int drv_pause(int chan);
  19 int drv_resume(int chan);
  20 int drv_io_ctl(unsigned long request, void * val, int * len, int sub_dev);
  21 int drv_get_irq(char *irq);
  22 int drv_get_frag_size(u32_t *frag_size, int sub_dev);
  23
  24
  25
  26 /* runtime status fields */
  27 typedef struct {
  28         int readable;
  29         int writable;
  30         int DmaSize;
  31         int NrOfDmaFragments;
  32         int MinFragmentSize;
  33         int NrOfExtraBuffers;
  34         int Nr;                                   /* sub device number */
  35         int Opened;                               /* sub device opened */
  36         int DmaBusy;                              /* is dma busy? */
  37         int DmaMode;                              /* DEV_WRITE / DEV_READ */
  38         int DmaReadNext;                          /* current dma buffer */
  39         int DmaFillNext;                          /* next dma buffer to fill */
  40         int DmaLength;
  41         int BufReadNext;                          /* start of extra circular buffer */
  42         int BufFillNext;                          /* end of extra circular buffer */
  43         int BufLength;
  44         int RevivePending;                        /* process waiting for this dev? */
  45         endpoint_t ReviveProcNr;                  /* the process to unblock */
  46         cdev_id_t ReviveId;                       /* request ID */
  47         cp_grant_id_t ReviveGrant;                /* grant id associated with io */
  48         endpoint_t SourceProcNr;                  /* process to send notify to (FS) */
  49         u32_t FragSize;                           /* dma fragment size */
  50         char *DmaBuf;        /* the dma buffer; extra space for
  51                                                                                                   page alignment */
  52         phys_bytes DmaPhys;                       /* physical address of dma buffer */
  53         char* DmaPtr;                             /* pointer to aligned dma buffer */
  54         int OutOfData;                            /* all buffers empty? */
  55         char *ExtraBuf;                           /* don't use extra buffer;just
  56                                                                                            declare a pointer to supress
  57                                                                                            error messages */
  58 } sub_dev_t;
  59
  60 typedef struct {
  61         int minor_dev_nr;
  62         int read_chan;
  63         int write_chan;
  64         int io_ctl;
  65 } special_file_t;
  66
  67 typedef struct {
  68         char* DriverName;
  69         int NrOfSubDevices;
  70         int NrOfSpecialFiles;
  71 } drv_t;
  72
  73 EXTERN drv_t drv;
  74 EXTERN sub_dev_t sub_dev[];
  75 EXTERN special_file_t special_file[];
  76
  77 /* Number of bytes you can DMA before hitting a 64K boundary: */
  78 #define dma_bytes_left(phys)    \
  79    ((unsigned) (sizeof(int) == 2 ? 0 : 0x10000) - (unsigned) ((phys) & 0xFFFF))
  80
  81 #define NO_CHANNEL -1
  82
  83 #define NO_DMA 0
  84 #define READ_DMA 1
  85 #define WRITE_DMA 2
  86
  87 #endif /* AUDIO_FW_H */