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 */
68
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