Skip to content

L
linux
Commit bca3a6d1 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
Browse files
Options

staging: comedi: 8253.h: remove unused header 

All the comedi drivers have been converted to use the comedi_8254 module
to provide support for the 8254 timers. Remove this unused header.
Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c0cfeca1
Hide whitespace changes
Inline Side-by-side
Showing with 0 additions and 347 deletions
drivers/staging/comedi/drivers/8253.h deleted 100644 → 0
View file @ c0cfeca1
/*
* comedi/drivers/8253.h
* Header file for 8253
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _8253_H
#define _8253_H
#include "../comedi.h"
/*
* Common oscillator base values in nanoseconds
*/
#define I8254_OSC_BASE_10MHZ 100
#define I8254_OSC_BASE_5MHZ 200
#define I8254_OSC_BASE_4MHZ 250
#define I8254_OSC_BASE_2MHZ 500
#define I8254_OSC_BASE_1MHZ 1000
static inline void i8253_cascade_ns_to_timer(int i8253_osc_base,
unsigned int *d1,
unsigned int *d2,
unsigned int *nanosec,
unsigned int flags)
{
unsigned int divider;
unsigned int div1, div2;
unsigned int div1_glb, div2_glb, ns_glb;
unsigned int div1_lub, div2_lub, ns_lub;
unsigned int ns;
unsigned int start;
unsigned int ns_low, ns_high;
static const unsigned int max_count = 0x10000;
/*
* exit early if everything is already correct (this can save time
* since this function may be called repeatedly during command tests
* and execution)
*/
div1 = *d1 ? *d1 : max_count;
div2 = *d2 ? *d2 : max_count;
divider = div1 * div2;
if (div1 * div2 * i8253_osc_base == *nanosec &&
div1 > 1 && div1 <= max_count && div2 > 1 && div2 <= max_count &&
/* check for overflow */
divider > div1 && divider > div2 &&
divider * i8253_osc_base > divider &&
divider * i8253_osc_base > i8253_osc_base) {
return;
}
divider = *nanosec / i8253_osc_base;
div1_lub = div2_lub = 0;
div1_glb = div2_glb = 0;
ns_glb = 0;
ns_lub = 0xffffffff;
div2 = max_count;
start = divider / div2;
if (start < 2)
start = 2;
for (div1 = start; div1 <= divider / div1 + 1 && div1 <= max_count;
div1++) {
for (div2 = divider / div1;
div1 * div2 <= divider + div1 + 1 && div2 <= max_count;
div2++) {
ns = i8253_osc_base * div1 * div2;
if (ns <= *nanosec && ns > ns_glb) {
ns_glb = ns;
div1_glb = div1;
div2_glb = div2;
}
if (ns >= *nanosec && ns < ns_lub) {
ns_lub = ns;
div1_lub = div1;
div2_lub = div2;
}
}
}
switch (flags & CMDF_ROUND_MASK) {
case CMDF_ROUND_NEAREST:
default:
ns_high = div1_lub * div2_lub * i8253_osc_base;
ns_low = div1_glb * div2_glb * i8253_osc_base;
if (ns_high - *nanosec < *nanosec - ns_low) {
div1 = div1_lub;
div2 = div2_lub;
} else {
div1 = div1_glb;
div2 = div2_glb;
}
break;
case CMDF_ROUND_UP:
div1 = div1_lub;
div2 = div2_lub;
break;
case CMDF_ROUND_DOWN:
div1 = div1_glb;
div2 = div2_glb;
break;
}
*nanosec = div1 * div2 * i8253_osc_base;
/* masking is done since counter maps zero to 0x10000 */
*d1 = div1 & 0xffff;
*d2 = div2 & 0xffff;
}
#ifndef CMDTEST
/*
* i8254_load programs 8254 counter chip. It should also work for the 8253.
* base_address is the lowest io address
* for the chip (the address of counter 0).
* counter_number is the counter you want to load (0,1 or 2)
* count is the number to load into the counter.
*
* You probably want to use mode 2.
*
* Use i8254_mm_load() if you board uses memory-mapped io, it is
* the same as i8254_load() except it uses writeb() instead of outb().
*
* Neither i8254_load() or i8254_read() do their loading/reading
* atomically. The 16 bit read/writes are performed with two successive
* 8 bit read/writes. So if two parts of your driver do a load/read on
* the same counter, it may be necessary to protect these functions
* with a spinlock.
*
* FMH
*/
#define i8254_control_reg 3
static inline int i8254_load(unsigned long base_address, unsigned int regshift,
unsigned int counter_number, unsigned int count,
unsigned int mode)
{
unsigned int byte;
if (counter_number > 2)
return -1;
if (count > 0xffff)
return -1;
if (mode > 5)
return -1;
if ((mode == 2 || mode == 3) && count == 1)
return -1;
byte = counter_number << 6;
byte |= 0x30; /* load low then high byte */
byte |= (mode << 1); /* set counter mode */
outb(byte, base_address + (i8254_control_reg << regshift));
byte = count & 0xff; /* lsb of counter value */
outb(byte, base_address + (counter_number << regshift));
byte = (count >> 8) & 0xff; /* msb of counter value */
outb(byte, base_address + (counter_number << regshift));
return 0;
}
static inline int i8254_mm_load(void __iomem *base_address,
unsigned int regshift,
unsigned int counter_number,
unsigned int count,
unsigned int mode)
{
unsigned int byte;
if (counter_number > 2)
return -1;
if (count > 0xffff)
return -1;
if (mode > 5)
return -1;
if ((mode == 2 || mode == 3) && count == 1)
return -1;
byte = counter_number << 6;
byte |= 0x30; /* load low then high byte */
byte |= (mode << 1); /* set counter mode */
writeb(byte, base_address + (i8254_control_reg << regshift));
byte = count & 0xff; /* lsb of counter value */
writeb(byte, base_address + (counter_number << regshift));
byte = (count >> 8) & 0xff; /* msb of counter value */
writeb(byte, base_address + (counter_number << regshift));
return 0;
}
/* Returns 16 bit counter value, should work for 8253 also. */
static inline int i8254_read(unsigned long base_address, unsigned int regshift,
unsigned int counter_number)
{
unsigned int byte;
int ret;
if (counter_number > 2)
return -1;
/* latch counter */
byte = counter_number << 6;
outb(byte, base_address + (i8254_control_reg << regshift));
/* read lsb */
ret = inb(base_address + (counter_number << regshift));
/* read msb */
ret += inb(base_address + (counter_number << regshift)) << 8;
return ret;
}
static inline int i8254_mm_read(void __iomem *base_address,
unsigned int regshift,
unsigned int counter_number)
{
unsigned int byte;
int ret;
if (counter_number > 2)
return -1;
/* latch counter */
byte = counter_number << 6;
writeb(byte, base_address + (i8254_control_reg << regshift));
/* read lsb */
ret = readb(base_address + (counter_number << regshift));
/* read msb */
ret += readb(base_address + (counter_number << regshift)) << 8;
return ret;
}
/* Loads 16 bit initial counter value, should work for 8253 also. */
static inline void i8254_write(unsigned long base_address,
unsigned int regshift,
unsigned int counter_number, unsigned int count)
{
unsigned int byte;
if (counter_number > 2)
return;
byte = count & 0xff; /* lsb of counter value */
outb(byte, base_address + (counter_number << regshift));
byte = (count >> 8) & 0xff; /* msb of counter value */
outb(byte, base_address + (counter_number << regshift));
}
static inline void i8254_mm_write(void __iomem *base_address,
unsigned int regshift,
unsigned int counter_number,
unsigned int count)
{
unsigned int byte;
if (counter_number > 2)
return;
byte = count & 0xff; /* lsb of counter value */
writeb(byte, base_address + (counter_number << regshift));
byte = (count >> 8) & 0xff; /* msb of counter value */
writeb(byte, base_address + (counter_number << regshift));
}
/*
* Set counter mode, should work for 8253 also.
* Note: the 'mode' value is different to that for i8254_load() and comes
* from the INSN_CONFIG_8254_SET_MODE command:
* I8254_MODE0, I8254_MODE1, ..., I8254_MODE5
* OR'ed with:
* I8254_BCD, I8254_BINARY
*/
static inline int i8254_set_mode(unsigned long base_address,
unsigned int regshift,
unsigned int counter_number, unsigned int mode)
{
unsigned int byte;
if (counter_number > 2)
return -1;
if (mode > (I8254_MODE5 | I8254_BCD))
return -1;
byte = counter_number << 6;
byte |= 0x30; /* load low then high byte */
byte |= mode; /* set counter mode and BCD|binary */
outb(byte, base_address + (i8254_control_reg << regshift));
return 0;
}
static inline int i8254_mm_set_mode(void __iomem *base_address,
unsigned int regshift,
unsigned int counter_number,
unsigned int mode)
{
unsigned int byte;
if (counter_number > 2)
return -1;
if (mode > (I8254_MODE5 | I8254_BCD))
return -1;
byte = counter_number << 6;
byte |= 0x30; /* load low then high byte */
byte |= mode; /* set counter mode and BCD|binary */
writeb(byte, base_address + (i8254_control_reg << regshift));
return 0;
}
static inline int i8254_status(unsigned long base_address,
unsigned int regshift,
unsigned int counter_number)
{
outb(0xE0 | (2 << counter_number),
base_address + (i8254_control_reg << regshift));
return inb(base_address + (counter_number << regshift));
}
static inline int i8254_mm_status(void __iomem *base_address,
unsigned int regshift,
unsigned int counter_number)
{
writeb(0xE0 | (2 << counter_number),
base_address + (i8254_control_reg << regshift));
return readb(base_address + (counter_number << regshift));
}
#endif
#endif
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7