Subversion Repositories or1k

#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 */

/* 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 */