projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d42b5211 HS |
1 | /* |
| 2 | * comedi_8254.h | |
| 3 | * Generic 8254 timer/counter support | |
| 4 | * Copyright (C) 2014 H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 5 | * | |
| 6 | * COMEDI - Linux Control and Measurement Device Interface | |
| 7 | * Copyright (C) 2000 David A. Schleef <ds@schleef.org> | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or modify | |
| 10 | * it under the terms of the GNU General Public License as published by | |
| 11 | * the Free Software Foundation; either version 2 of the License, or | |
| 12 | * (at your option) any later version. | |
| 13 | * | |
| 14 | * This program is distributed in the hope that it will be useful, | |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | * GNU General Public License for more details. | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef _COMEDI_8254_H | |
| 21 | #define _COMEDI_8254_H | |
| 22 | ||
| b727255f IA |
23 | #include <linux/types.h> |
| 24 | ||
| 25 | struct comedi_device; | |
| 26 | struct comedi_insn; | |
| 27 | struct comedi_subdevice; | |
| 28 | ||
| d42b5211 HS |
29 | /* |
| 30 | * Common oscillator base values in nanoseconds | |
| 31 | */ | |
| 32 | #define I8254_OSC_BASE_10MHZ 100 | |
| 33 | #define I8254_OSC_BASE_5MHZ 200 | |
| 34 | #define I8254_OSC_BASE_4MHZ 250 | |
| 35 | #define I8254_OSC_BASE_2MHZ 500 | |
| 36 | #define I8254_OSC_BASE_1MHZ 1000 | |
| 37 | #define I8254_OSC_BASE_100KHZ 10000 | |
| 38 | #define I8254_OSC_BASE_10KHZ 100000 | |
| 39 | #define I8254_OSC_BASE_1KHZ 1000000 | |
| 40 | ||
| 41 | /* | |
| 42 | * I/O access size used to read/write registers | |
| 43 | */ | |
| 44 | #define I8254_IO8 1 | |
| 45 | #define I8254_IO16 2 | |
| 46 | #define I8254_IO32 4 | |
| 47 | ||
| 48 | /* | |
| 49 | * Register map for generic 8254 timer (I8254_IO8 with 0 regshift) | |
| 50 | */ | |
| 51 | #define I8254_COUNTER0_REG 0x00 | |
| 52 | #define I8254_COUNTER1_REG 0x01 | |
| 53 | #define I8254_COUNTER2_REG 0x02 | |
| 54 | #define I8254_CTRL_REG 0x03 | |
| 55 | #define I8254_CTRL_SEL_CTR(x) ((x) << 6) | |
| 56 | #define I8254_CTRL_READBACK_COUNT ((3 << 6) | (1 << 4)) | |
| 57 | #define I8254_CTRL_READBACK_STATUS ((3 << 6) | (1 << 5)) | |
| 58 | #define I8254_CTRL_READBACK_SEL_CTR(x) (2 << (x)) | |
| 59 | #define I8254_CTRL_LATCH (0 << 4) | |
| 60 | #define I8254_CTRL_LSB_ONLY (1 << 4) | |
| 61 | #define I8254_CTRL_MSB_ONLY (2 << 4) | |
| 62 | #define I8254_CTRL_LSB_MSB (3 << 4) | |
| 63 | ||
| 64 | /* counter maps zero to 0x10000 */ | |
| 65 | #define I8254_MAX_COUNT 0x10000 | |
| 66 | ||
| 67 | /** | |
| 68 | * struct comedi_8254 - private data used by this module | |
| 69 | * @iobase: PIO base address of the registers (in/out) | |
| 70 | * @mmio: MMIO base address of the registers (read/write) | |
| 71 | * @iosize: I/O size used to access the registers (b/w/l) | |
| 72 | * @regshift: register gap shift | |
| 73 | * @osc_base: cascaded oscillator speed in ns | |
| 74 | * @divisor: divisor for single counter | |
| 75 | * @divisor1: divisor loaded into first cascaded counter | |
| 76 | * @divisor2: divisor loaded into second cascaded counter | |
| 77 | * #next_div: next divisor for single counter | |
| 78 | * @next_div1: next divisor to use for first cascaded counter | |
| 79 | * @next_div2: next divisor to use for second cascaded counter | |
| 5a213fa6 HS |
80 | * @clock_src; current clock source for each counter (driver specific) |
| 81 | * @gate_src; current gate source for each counter (driver specific) | |
| d42b5211 HS |
82 | * @busy: flags used to indicate that a counter is "busy" |
| 83 | * @insn_config: driver specific (*insn_config) callback | |
| 84 | */ | |
| 85 | struct comedi_8254 { | |
| 86 | unsigned long iobase; | |
| 87 | void __iomem *mmio; | |
| 88 | unsigned int iosize; | |
| 89 | unsigned int regshift; | |
| 90 | unsigned int osc_base; | |
| 91 | unsigned int divisor; | |
| 92 | unsigned int divisor1; | |
| 93 | unsigned int divisor2; | |
| 94 | unsigned int next_div; | |
| 95 | unsigned int next_div1; | |
| 96 | unsigned int next_div2; | |
| 5a213fa6 HS |
97 | unsigned int clock_src[3]; |
| 98 | unsigned int gate_src[3]; | |
| d42b5211 HS |
99 | bool busy[3]; |
| 100 | ||
| 101 | int (*insn_config)(struct comedi_device *, struct comedi_subdevice *s, | |
| 102 | struct comedi_insn *, unsigned int *data); | |
| 103 | }; | |
| 104 | ||
| 105 | unsigned int comedi_8254_status(struct comedi_8254 *, unsigned int counter); | |
| 106 | unsigned int comedi_8254_read(struct comedi_8254 *, unsigned int counter); | |
| 107 | void comedi_8254_write(struct comedi_8254 *, | |
| 108 | unsigned int counter, unsigned int val); | |
| 109 | ||
| 110 | int comedi_8254_set_mode(struct comedi_8254 *, | |
| 111 | unsigned int counter, unsigned int mode); | |
| 112 | int comedi_8254_load(struct comedi_8254 *, | |
| 113 | unsigned int counter, unsigned int val, unsigned int mode); | |
| 114 | ||
| 115 | void comedi_8254_pacer_enable(struct comedi_8254 *, | |
| 116 | unsigned int counter1, unsigned int counter2, | |
| 117 | bool enable); | |
| 118 | void comedi_8254_update_divisors(struct comedi_8254 *); | |
| 119 | void comedi_8254_cascade_ns_to_timer(struct comedi_8254 *, | |
| 120 | unsigned int *nanosec, unsigned int flags); | |
| 121 | void comedi_8254_ns_to_timer(struct comedi_8254 *, | |
| 122 | unsigned int *nanosec, unsigned int flags); | |
| 123 | ||
| 124 | void comedi_8254_set_busy(struct comedi_8254 *, | |
| 125 | unsigned int counter, bool busy); | |
| 126 | ||
| 127 | void comedi_8254_subdevice_init(struct comedi_subdevice *, | |
| 128 | struct comedi_8254 *); | |
| 129 | ||
| 130 | struct comedi_8254 *comedi_8254_init(unsigned long iobase, | |
| 131 | unsigned int osc_base, | |
| 132 | unsigned int iosize, | |
| 133 | unsigned int regshift); | |
| 134 | struct comedi_8254 *comedi_8254_mm_init(void __iomem *mmio, | |
| 135 | unsigned int osc_base, | |
| 136 | unsigned int iosize, | |
| 137 | unsigned int regshift); | |
| 138 | ||
| 139 | #endif /* _COMEDI_8254_H */ |