135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* comedi_8254.h
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* Generic 8254 timer/counter support
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* Copyright (C) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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*/
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#ifndef _COMEDI_8254_H
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#define _COMEDI_8254_H
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#include <linux/types.h>
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struct comedi_device;
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struct comedi_insn;
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struct comedi_subdevice;
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/*
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* Common oscillator base values in nanoseconds
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*/
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#define I8254_OSC_BASE_10MHZ 100
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#define I8254_OSC_BASE_5MHZ 200
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#define I8254_OSC_BASE_4MHZ 250
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#define I8254_OSC_BASE_2MHZ 500
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#define I8254_OSC_BASE_1MHZ 1000
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#define I8254_OSC_BASE_100KHZ 10000
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#define I8254_OSC_BASE_10KHZ 100000
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#define I8254_OSC_BASE_1KHZ 1000000
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/*
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* I/O access size used to read/write registers
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*/
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#define I8254_IO8 1
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#define I8254_IO16 2
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#define I8254_IO32 4
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/*
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* Register map for generic 8254 timer (I8254_IO8 with 0 regshift)
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*/
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#define I8254_COUNTER0_REG 0x00
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#define I8254_COUNTER1_REG 0x01
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#define I8254_COUNTER2_REG 0x02
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#define I8254_CTRL_REG 0x03
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#define I8254_CTRL_SEL_CTR(x) ((x) << 6)
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#define I8254_CTRL_READBACK(x) (I8254_CTRL_SEL_CTR(3) | BIT(x))
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#define I8254_CTRL_READBACK_COUNT I8254_CTRL_READBACK(4)
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#define I8254_CTRL_READBACK_STATUS I8254_CTRL_READBACK(5)
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#define I8254_CTRL_READBACK_SEL_CTR(x) (2 << (x))
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#define I8254_CTRL_RW(x) (((x) & 0x3) << 4)
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#define I8254_CTRL_LATCH I8254_CTRL_RW(0)
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#define I8254_CTRL_LSB_ONLY I8254_CTRL_RW(1)
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#define I8254_CTRL_MSB_ONLY I8254_CTRL_RW(2)
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#define I8254_CTRL_LSB_MSB I8254_CTRL_RW(3)
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/* counter maps zero to 0x10000 */
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#define I8254_MAX_COUNT 0x10000
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/**
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* struct comedi_8254 - private data used by this module
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* @iobase: PIO base address of the registers (in/out)
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* @mmio: MMIO base address of the registers (read/write)
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* @iosize: I/O size used to access the registers (b/w/l)
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* @regshift: register gap shift
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* @osc_base: cascaded oscillator speed in ns
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* @divisor: divisor for single counter
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* @divisor1: divisor loaded into first cascaded counter
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* @divisor2: divisor loaded into second cascaded counter
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* #next_div: next divisor for single counter
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* @next_div1: next divisor to use for first cascaded counter
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* @next_div2: next divisor to use for second cascaded counter
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* @clock_src; current clock source for each counter (driver specific)
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* @gate_src; current gate source for each counter (driver specific)
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* @busy: flags used to indicate that a counter is "busy"
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* @insn_config: driver specific (*insn_config) callback
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*/
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struct comedi_8254 {
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unsigned long iobase;
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void __iomem *mmio;
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unsigned int iosize;
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unsigned int regshift;
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unsigned int osc_base;
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unsigned int divisor;
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unsigned int divisor1;
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unsigned int divisor2;
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unsigned int next_div;
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unsigned int next_div1;
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unsigned int next_div2;
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unsigned int clock_src[3];
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unsigned int gate_src[3];
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bool busy[3];
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int (*insn_config)(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn, unsigned int *data);
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};
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unsigned int comedi_8254_status(struct comedi_8254 *i8254,
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unsigned int counter);
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unsigned int comedi_8254_read(struct comedi_8254 *i8254, unsigned int counter);
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void comedi_8254_write(struct comedi_8254 *i8254,
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unsigned int counter, unsigned int val);
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int comedi_8254_set_mode(struct comedi_8254 *i8254,
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unsigned int counter, unsigned int mode);
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int comedi_8254_load(struct comedi_8254 *i8254,
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unsigned int counter, unsigned int val, unsigned int mode);
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void comedi_8254_pacer_enable(struct comedi_8254 *i8254,
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unsigned int counter1, unsigned int counter2,
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bool enable);
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void comedi_8254_update_divisors(struct comedi_8254 *i8254);
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void comedi_8254_cascade_ns_to_timer(struct comedi_8254 *i8254,
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unsigned int *nanosec, unsigned int flags);
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void comedi_8254_ns_to_timer(struct comedi_8254 *i8254,
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unsigned int *nanosec, unsigned int flags);
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void comedi_8254_set_busy(struct comedi_8254 *i8254,
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unsigned int counter, bool busy);
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void comedi_8254_subdevice_init(struct comedi_subdevice *s,
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struct comedi_8254 *i8254);
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struct comedi_8254 *comedi_8254_init(unsigned long iobase,
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unsigned int osc_base,
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unsigned int iosize,
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unsigned int regshift);
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struct comedi_8254 *comedi_8254_mm_init(void __iomem *mmio,
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unsigned int osc_base,
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unsigned int iosize,
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unsigned int regshift);
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#endif /* _COMEDI_8254_H */
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