include/asm-m68k/atari_SCCserial.h

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 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 */