include/asm-m68k/atari_SCCserial.h

   1 #ifndef _ATARI_SCCSERIAL_H
   2 #define _ATARI_SCCSERIAL_H
   3
   4 /* Special configuration ioctls for the Atari SCC5380 Serial
   5  * Communications Controller
   6  */
   7
   8 /* ioctl command codes */
   9
  10 #define TIOCGATSCC      0x54c0  /* get SCC configuration */
  11 #define TIOCSATSCC      0x54c1  /* set SCC configuration */
  12 #define TIOCDATSCC      0x54c2  /* reset configuration to defaults */
  13
  14 /* Clock sources */
  15
  16 #define CLK_RTxC        0
  17 #define CLK_TRxC        1
  18 #define CLK_PCLK        2
  19
  20 /* baud_bases for the common clocks in the Atari. These are the real
  21  * frequencies divided by 16.
  22  */
  23
  24 #define SCC_BAUD_BASE_TIMC      19200   /* 0.3072 MHz from TT-MFP, Timer C */
  25 #define SCC_BAUD_BASE_BCLK      153600  /* 2.4576 MHz */
  26 #define SCC_BAUD_BASE_PCLK4     229500  /* 3.6720 MHz */
  27 #define SCC_BAUD_BASE_PCLK      503374  /* 8.0539763 MHz */
  28 #define SCC_BAUD_BASE_NONE      0               /* for not connected or unused
  29                                                  * clock sources */
  30
  31 #define SCC_BAUD_BASE_M147_PCLK 312500  /* 5 MHz */
  32 #define SCC_BAUD_BASE_M147      312500  /* 5 MHz */
  33 #define SCC_BAUD_BASE_MVME_PCLK 781250  /* 12.5 MHz */
  34 #define SCC_BAUD_BASE_MVME      625000  /* 10.000 MHz */
  35 #define SCC_BAUD_BASE_BVME_PCLK 781250  /* 12.5 MHz */   /* XXX ??? */
  36 #define SCC_BAUD_BASE_BVME      460800  /* 7.3728 MHz */
  37
  38 /* The SCC configuration structure */
  39
  40 struct atari_SCCserial {
  41         unsigned        RTxC_base;      /* base_baud of RTxC */
  42         unsigned        TRxC_base;      /* base_baud of TRxC */
  43         unsigned        PCLK_base;      /* base_baud of PCLK, for both channels! */
  44         struct {
  45                 unsigned clksrc;        /* CLK_RTxC, CLK_TRxC or CLK_PCLK */
  46                 unsigned divisor;       /* divisor for base baud, valid values:
  47                                          * see below */
  48         } baud_table[17];               /* For 50, 75, 110, 135, 150, 200, 300,
  49                                          * 600, 1200, 1800, 2400, 4800, 9600,
  50                                          * 19200, 38400, 57600 and 115200 bps. The
  51                                          * last two could be replaced by other
  52                                          * rates > 38400 if they're not possible.
  53                                          */
  54 };
  55
  56 /* The following divisors are valid:
  57  *
  58  *   - CLK_RTxC: 1 or even (1, 2 and 4 are the direct modes, > 4 use
  59  *               the BRG)
  60  *
  61  *   - CLK_TRxC: 1, 2 or 4 (no BRG, only direct modes possible)
  62  *
  63  *   - CLK_PCLK: >= 4 and even (no direct modes, only BRG)
  64  *
  65  */
  66
  67 #endif /* _ATARI_SCCSERIAL_H */