atari_SCCserial.h
上传用户:lgb322
上传日期:2013-02-24
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文件大小:2k
- #ifndef _ATARI_SCCSERIAL_H
- #define _ATARI_SCCSERIAL_H
- /* Special configuration ioctls for the Atari SCC5380 Serial
- * Communications Controller
- */
- /* ioctl command codes */
- #define TIOCGATSCC 0x54c0 /* get SCC configuration */
- #define TIOCSATSCC 0x54c1 /* set SCC configuration */
- #define TIOCDATSCC 0x54c2 /* reset configuration to defaults */
- /* Clock sources */
- #define CLK_RTxC 0
- #define CLK_TRxC 1
- #define CLK_PCLK 2
- /* baud_bases for the common clocks in the Atari. These are the real
- * frequencies divided by 16.
- */
-
- #define SCC_BAUD_BASE_TIMC 19200 /* 0.3072 MHz from TT-MFP, Timer C */
- #define SCC_BAUD_BASE_BCLK 153600 /* 2.4576 MHz */
- #define SCC_BAUD_BASE_PCLK4 229500 /* 3.6720 MHz */
- #define SCC_BAUD_BASE_PCLK 503374 /* 8.0539763 MHz */
- #define SCC_BAUD_BASE_NONE 0 /* for not connected or unused
- * clock sources */
- #define SCC_BAUD_BASE_M147_PCLK 312500 /* 5 MHz */
- #define SCC_BAUD_BASE_M147 312500 /* 5 MHz */
- #define SCC_BAUD_BASE_MVME_PCLK 781250 /* 12.5 MHz */
- #define SCC_BAUD_BASE_MVME 625000 /* 10.000 MHz */
- #define SCC_BAUD_BASE_BVME_PCLK 781250 /* 12.5 MHz */ /* XXX ??? */
- #define SCC_BAUD_BASE_BVME 460800 /* 7.3728 MHz */
- /* The SCC configuration structure */
- struct atari_SCCserial {
- unsigned RTxC_base; /* base_baud of RTxC */
- unsigned TRxC_base; /* base_baud of TRxC */
- unsigned PCLK_base; /* base_baud of PCLK, for both channels! */
- struct {
- unsigned clksrc; /* CLK_RTxC, CLK_TRxC or CLK_PCLK */
- unsigned divisor; /* divisor for base baud, valid values:
- * see below */
- } baud_table[17]; /* For 50, 75, 110, 135, 150, 200, 300,
- * 600, 1200, 1800, 2400, 4800, 9600,
- * 19200, 38400, 57600 and 115200 bps. The
- * last two could be replaced by other
- * rates > 38400 if they're not possible.
- */
- };
- /* The following divisors are valid:
- *
- * - CLK_RTxC: 1 or even (1, 2 and 4 are the direct modes, > 4 use
- * the BRG)
- *
- * - CLK_TRxC: 1, 2 or 4 (no BRG, only direct modes possible)
- *
- * - CLK_PCLK: >= 4 and even (no direct modes, only BRG)
- *
- */
- #endif /* _ATARI_SCCSERIAL_H */