kernel/drivers/counter/104-quad-8.c
2024-07-22 17:22:30 +08:00

1031 lines
28 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Counter driver for the ACCES 104-QUAD-8
* Copyright (C) 2016 William Breathitt Gray
*
* This driver supports the ACCES 104-QUAD-8 and ACCES 104-QUAD-4.
*/
#include <linux/bitops.h>
#include <linux/counter.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/isa.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#define QUAD8_EXTENT 32
static unsigned int base[max_num_isa_dev(QUAD8_EXTENT)];
static unsigned int num_quad8;
module_param_hw_array(base, uint, ioport, &num_quad8, 0);
MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
#define QUAD8_NUM_COUNTERS 8
/**
* struct quad8 - device private data structure
* @lock: lock to prevent clobbering device states during R/W ops
* @counter: instance of the counter_device
* @fck_prescaler: array of filter clock prescaler configurations
* @preset: array of preset values
* @count_mode: array of count mode configurations
* @quadrature_mode: array of quadrature mode configurations
* @quadrature_scale: array of quadrature mode scale configurations
* @ab_enable: array of A and B inputs enable configurations
* @preset_enable: array of set_to_preset_on_index attribute configurations
* @synchronous_mode: array of index function synchronous mode configurations
* @index_polarity: array of index function polarity configurations
* @cable_fault_enable: differential encoder cable status enable configurations
* @base: base port address of the device
*/
struct quad8 {
struct mutex lock;
struct counter_device counter;
unsigned int fck_prescaler[QUAD8_NUM_COUNTERS];
unsigned int preset[QUAD8_NUM_COUNTERS];
unsigned int count_mode[QUAD8_NUM_COUNTERS];
unsigned int quadrature_mode[QUAD8_NUM_COUNTERS];
unsigned int quadrature_scale[QUAD8_NUM_COUNTERS];
unsigned int ab_enable[QUAD8_NUM_COUNTERS];
unsigned int preset_enable[QUAD8_NUM_COUNTERS];
unsigned int synchronous_mode[QUAD8_NUM_COUNTERS];
unsigned int index_polarity[QUAD8_NUM_COUNTERS];
unsigned int cable_fault_enable;
unsigned int base;
};
#define QUAD8_REG_CHAN_OP 0x11
#define QUAD8_REG_INDEX_INPUT_LEVELS 0x16
#define QUAD8_DIFF_ENCODER_CABLE_STATUS 0x17
/* Error flag */
#define QUAD8_FLAG_E BIT(4)
/* Up/Down flag */
#define QUAD8_FLAG_UD BIT(5)
/* Reset and Load Signal Decoders */
#define QUAD8_CTR_RLD 0x00
/* Counter Mode Register */
#define QUAD8_CTR_CMR 0x20
/* Input / Output Control Register */
#define QUAD8_CTR_IOR 0x40
/* Index Control Register */
#define QUAD8_CTR_IDR 0x60
/* Reset Byte Pointer (three byte data pointer) */
#define QUAD8_RLD_RESET_BP 0x01
/* Reset Counter */
#define QUAD8_RLD_RESET_CNTR 0x02
/* Reset Borrow Toggle, Carry Toggle, Compare Toggle, and Sign flags */
#define QUAD8_RLD_RESET_FLAGS 0x04
/* Reset Error flag */
#define QUAD8_RLD_RESET_E 0x06
/* Preset Register to Counter */
#define QUAD8_RLD_PRESET_CNTR 0x08
/* Transfer Counter to Output Latch */
#define QUAD8_RLD_CNTR_OUT 0x10
/* Transfer Preset Register LSB to FCK Prescaler */
#define QUAD8_RLD_PRESET_PSC 0x18
#define QUAD8_CHAN_OP_ENABLE_COUNTERS 0x00
#define QUAD8_CHAN_OP_RESET_COUNTERS 0x01
#define QUAD8_CMR_QUADRATURE_X1 0x08
#define QUAD8_CMR_QUADRATURE_X2 0x10
#define QUAD8_CMR_QUADRATURE_X4 0x18
/* Each Counter is 24 bits wide */
#define LS7267_CNTR_MAX GENMASK(23, 0)
static int quad8_signal_read(struct counter_device *counter,
struct counter_signal *signal,
enum counter_signal_level *level)
{
const struct quad8 *const priv = counter->priv;
unsigned int state;
/* Only Index signal levels can be read */
if (signal->id < 16)
return -EINVAL;
state = inb(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS)
& BIT(signal->id - 16);
*level = (state) ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW;
return 0;
}
static int quad8_count_read(struct counter_device *counter,
struct counter_count *count, u64 *val)
{
struct quad8 *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id;
int i;
*val = 0;
mutex_lock(&priv->lock);
/* Reset Byte Pointer; transfer Counter to Output Latch */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,
base_offset + 1);
for (i = 0; i < 3; i++)
*val |= (unsigned long)inb(base_offset) << (8 * i);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_count_write(struct counter_device *counter,
struct counter_count *count, u64 val)
{
struct quad8 *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id;
int i;
if (val > LS7267_CNTR_MAX)
return -ERANGE;
mutex_lock(&priv->lock);
/* Reset Byte Pointer */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Counter can only be set via Preset Register */
for (i = 0; i < 3; i++)
outb(val >> (8 * i), base_offset);
/* Transfer Preset Register to Counter */
outb(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1);
/* Reset Byte Pointer */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Set Preset Register back to original value */
val = priv->preset[count->id];
for (i = 0; i < 3; i++)
outb(val >> (8 * i), base_offset);
/* Reset Borrow, Carry, Compare, and Sign flags */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1);
/* Reset Error flag */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
mutex_unlock(&priv->lock);
return 0;
}
static const enum counter_function quad8_count_functions_list[] = {
COUNTER_FUNCTION_PULSE_DIRECTION,
COUNTER_FUNCTION_QUADRATURE_X1_A,
COUNTER_FUNCTION_QUADRATURE_X2_A,
COUNTER_FUNCTION_QUADRATURE_X4,
};
static int quad8_function_read(struct counter_device *counter,
struct counter_count *count,
enum counter_function *function)
{
struct quad8 *const priv = counter->priv;
const int id = count->id;
mutex_lock(&priv->lock);
if (priv->quadrature_mode[id])
switch (priv->quadrature_scale[id]) {
case 0:
*function = COUNTER_FUNCTION_QUADRATURE_X1_A;
break;
case 1:
*function = COUNTER_FUNCTION_QUADRATURE_X2_A;
break;
case 2:
*function = COUNTER_FUNCTION_QUADRATURE_X4;
break;
}
else
*function = COUNTER_FUNCTION_PULSE_DIRECTION;
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_function_write(struct counter_device *counter,
struct counter_count *count,
enum counter_function function)
{
struct quad8 *const priv = counter->priv;
const int id = count->id;
unsigned int *const quadrature_mode = priv->quadrature_mode + id;
unsigned int *const scale = priv->quadrature_scale + id;
unsigned int *const synchronous_mode = priv->synchronous_mode + id;
const int base_offset = priv->base + 2 * id + 1;
unsigned int mode_cfg;
unsigned int idr_cfg;
mutex_lock(&priv->lock);
mode_cfg = priv->count_mode[id] << 1;
idr_cfg = priv->index_polarity[id] << 1;
if (function == COUNTER_FUNCTION_PULSE_DIRECTION) {
*quadrature_mode = 0;
/* Quadrature scaling only available in quadrature mode */
*scale = 0;
/* Synchronous function not supported in non-quadrature mode */
if (*synchronous_mode) {
*synchronous_mode = 0;
/* Disable synchronous function mode */
outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
}
} else {
*quadrature_mode = 1;
switch (function) {
case COUNTER_FUNCTION_QUADRATURE_X1_A:
*scale = 0;
mode_cfg |= QUAD8_CMR_QUADRATURE_X1;
break;
case COUNTER_FUNCTION_QUADRATURE_X2_A:
*scale = 1;
mode_cfg |= QUAD8_CMR_QUADRATURE_X2;
break;
case COUNTER_FUNCTION_QUADRATURE_X4:
*scale = 2;
mode_cfg |= QUAD8_CMR_QUADRATURE_X4;
break;
default:
/* should never reach this path */
mutex_unlock(&priv->lock);
return -EINVAL;
}
}
/* Load mode configuration to Counter Mode Register */
outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_direction_read(struct counter_device *counter,
struct counter_count *count,
enum counter_count_direction *direction)
{
const struct quad8 *const priv = counter->priv;
unsigned int ud_flag;
const unsigned int flag_addr = priv->base + 2 * count->id + 1;
/* U/D flag: nonzero = up, zero = down */
ud_flag = inb(flag_addr) & QUAD8_FLAG_UD;
*direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD :
COUNTER_COUNT_DIRECTION_BACKWARD;
return 0;
}
static const enum counter_synapse_action quad8_index_actions_list[] = {
COUNTER_SYNAPSE_ACTION_NONE,
COUNTER_SYNAPSE_ACTION_RISING_EDGE,
};
static const enum counter_synapse_action quad8_synapse_actions_list[] = {
COUNTER_SYNAPSE_ACTION_NONE,
COUNTER_SYNAPSE_ACTION_RISING_EDGE,
COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
};
static int quad8_action_read(struct counter_device *counter,
struct counter_count *count,
struct counter_synapse *synapse,
enum counter_synapse_action *action)
{
struct quad8 *const priv = counter->priv;
int err;
enum counter_function function;
const size_t signal_a_id = count->synapses[0].signal->id;
enum counter_count_direction direction;
/* Handle Index signals */
if (synapse->signal->id >= 16) {
if (!priv->preset_enable[count->id])
*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
else
*action = COUNTER_SYNAPSE_ACTION_NONE;
return 0;
}
err = quad8_function_read(counter, count, &function);
if (err)
return err;
/* Default action mode */
*action = COUNTER_SYNAPSE_ACTION_NONE;
/* Determine action mode based on current count function mode */
switch (function) {
case COUNTER_FUNCTION_PULSE_DIRECTION:
if (synapse->signal->id == signal_a_id)
*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
return 0;
case COUNTER_FUNCTION_QUADRATURE_X1_A:
if (synapse->signal->id == signal_a_id) {
err = quad8_direction_read(counter, count, &direction);
if (err)
return err;
if (direction == COUNTER_COUNT_DIRECTION_FORWARD)
*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
else
*action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE;
}
return 0;
case COUNTER_FUNCTION_QUADRATURE_X2_A:
if (synapse->signal->id == signal_a_id)
*action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
return 0;
case COUNTER_FUNCTION_QUADRATURE_X4:
*action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
return 0;
default:
/* should never reach this path */
return -EINVAL;
}
}
static const struct counter_ops quad8_ops = {
.signal_read = quad8_signal_read,
.count_read = quad8_count_read,
.count_write = quad8_count_write,
.function_read = quad8_function_read,
.function_write = quad8_function_write,
.action_read = quad8_action_read
};
static const char *const quad8_index_polarity_modes[] = {
"negative",
"positive"
};
static int quad8_index_polarity_get(struct counter_device *counter,
struct counter_signal *signal,
u32 *index_polarity)
{
const struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id - 16;
*index_polarity = priv->index_polarity[channel_id];
return 0;
}
static int quad8_index_polarity_set(struct counter_device *counter,
struct counter_signal *signal,
u32 index_polarity)
{
struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id - 16;
const int base_offset = priv->base + 2 * channel_id + 1;
unsigned int idr_cfg = index_polarity << 1;
mutex_lock(&priv->lock);
idr_cfg |= priv->synchronous_mode[channel_id];
priv->index_polarity[channel_id] = index_polarity;
/* Load Index Control configuration to Index Control Register */
outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
mutex_unlock(&priv->lock);
return 0;
}
static const char *const quad8_synchronous_modes[] = {
"non-synchronous",
"synchronous"
};
static int quad8_synchronous_mode_get(struct counter_device *counter,
struct counter_signal *signal,
u32 *synchronous_mode)
{
const struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id - 16;
*synchronous_mode = priv->synchronous_mode[channel_id];
return 0;
}
static int quad8_synchronous_mode_set(struct counter_device *counter,
struct counter_signal *signal,
u32 synchronous_mode)
{
struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id - 16;
const int base_offset = priv->base + 2 * channel_id + 1;
unsigned int idr_cfg = synchronous_mode;
mutex_lock(&priv->lock);
idr_cfg |= priv->index_polarity[channel_id] << 1;
/* Index function must be non-synchronous in non-quadrature mode */
if (synchronous_mode && !priv->quadrature_mode[channel_id]) {
mutex_unlock(&priv->lock);
return -EINVAL;
}
priv->synchronous_mode[channel_id] = synchronous_mode;
/* Load Index Control configuration to Index Control Register */
outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_count_floor_read(struct counter_device *counter,
struct counter_count *count, u64 *floor)
{
/* Only a floor of 0 is supported */
*floor = 0;
return 0;
}
static int quad8_count_mode_read(struct counter_device *counter,
struct counter_count *count,
enum counter_count_mode *cnt_mode)
{
const struct quad8 *const priv = counter->priv;
/* Map 104-QUAD-8 count mode to Generic Counter count mode */
switch (priv->count_mode[count->id]) {
case 0:
*cnt_mode = COUNTER_COUNT_MODE_NORMAL;
break;
case 1:
*cnt_mode = COUNTER_COUNT_MODE_RANGE_LIMIT;
break;
case 2:
*cnt_mode = COUNTER_COUNT_MODE_NON_RECYCLE;
break;
case 3:
*cnt_mode = COUNTER_COUNT_MODE_MODULO_N;
break;
}
return 0;
}
static int quad8_count_mode_write(struct counter_device *counter,
struct counter_count *count,
enum counter_count_mode cnt_mode)
{
struct quad8 *const priv = counter->priv;
unsigned int count_mode;
unsigned int mode_cfg;
const int base_offset = priv->base + 2 * count->id + 1;
/* Map Generic Counter count mode to 104-QUAD-8 count mode */
switch (cnt_mode) {
case COUNTER_COUNT_MODE_NORMAL:
count_mode = 0;
break;
case COUNTER_COUNT_MODE_RANGE_LIMIT:
count_mode = 1;
break;
case COUNTER_COUNT_MODE_NON_RECYCLE:
count_mode = 2;
break;
case COUNTER_COUNT_MODE_MODULO_N:
count_mode = 3;
break;
default:
/* should never reach this path */
return -EINVAL;
}
mutex_lock(&priv->lock);
priv->count_mode[count->id] = count_mode;
/* Set count mode configuration value */
mode_cfg = count_mode << 1;
/* Add quadrature mode configuration */
if (priv->quadrature_mode[count->id])
mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3;
/* Load mode configuration to Counter Mode Register */
outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_count_enable_read(struct counter_device *counter,
struct counter_count *count, u8 *enable)
{
const struct quad8 *const priv = counter->priv;
*enable = priv->ab_enable[count->id];
return 0;
}
static int quad8_count_enable_write(struct counter_device *counter,
struct counter_count *count, u8 enable)
{
struct quad8 *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id;
unsigned int ior_cfg;
mutex_lock(&priv->lock);
priv->ab_enable[count->id] = enable;
ior_cfg = enable | priv->preset_enable[count->id] << 1;
/* Load I/O control configuration */
outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
mutex_unlock(&priv->lock);
return 0;
}
static const char *const quad8_noise_error_states[] = {
"No excessive noise is present at the count inputs",
"Excessive noise is present at the count inputs"
};
static int quad8_error_noise_get(struct counter_device *counter,
struct counter_count *count, u32 *noise_error)
{
const struct quad8 *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id + 1;
*noise_error = !!(inb(base_offset) & QUAD8_FLAG_E);
return 0;
}
static int quad8_count_preset_read(struct counter_device *counter,
struct counter_count *count, u64 *preset)
{
const struct quad8 *const priv = counter->priv;
*preset = priv->preset[count->id];
return 0;
}
static void quad8_preset_register_set(struct quad8 *const priv, const int id,
const unsigned int preset)
{
const unsigned int base_offset = priv->base + 2 * id;
int i;
priv->preset[id] = preset;
/* Reset Byte Pointer */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Set Preset Register */
for (i = 0; i < 3; i++)
outb(preset >> (8 * i), base_offset);
}
static int quad8_count_preset_write(struct counter_device *counter,
struct counter_count *count, u64 preset)
{
struct quad8 *const priv = counter->priv;
if (preset > LS7267_CNTR_MAX)
return -ERANGE;
mutex_lock(&priv->lock);
quad8_preset_register_set(priv, count->id, preset);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_count_ceiling_read(struct counter_device *counter,
struct counter_count *count, u64 *ceiling)
{
struct quad8 *const priv = counter->priv;
mutex_lock(&priv->lock);
/* Range Limit and Modulo-N count modes use preset value as ceiling */
switch (priv->count_mode[count->id]) {
case 1:
case 3:
*ceiling = priv->preset[count->id];
break;
default:
*ceiling = LS7267_CNTR_MAX;
break;
}
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_count_ceiling_write(struct counter_device *counter,
struct counter_count *count, u64 ceiling)
{
struct quad8 *const priv = counter->priv;
if (ceiling > LS7267_CNTR_MAX)
return -ERANGE;
mutex_lock(&priv->lock);
/* Range Limit and Modulo-N count modes use preset value as ceiling */
switch (priv->count_mode[count->id]) {
case 1:
case 3:
quad8_preset_register_set(priv, count->id, ceiling);
mutex_unlock(&priv->lock);
return 0;
}
mutex_unlock(&priv->lock);
return -EINVAL;
}
static int quad8_count_preset_enable_read(struct counter_device *counter,
struct counter_count *count,
u8 *preset_enable)
{
const struct quad8 *const priv = counter->priv;
*preset_enable = !priv->preset_enable[count->id];
return 0;
}
static int quad8_count_preset_enable_write(struct counter_device *counter,
struct counter_count *count,
u8 preset_enable)
{
struct quad8 *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id + 1;
unsigned int ior_cfg;
/* Preset enable is active low in Input/Output Control register */
preset_enable = !preset_enable;
mutex_lock(&priv->lock);
priv->preset_enable[count->id] = preset_enable;
ior_cfg = priv->ab_enable[count->id] | preset_enable << 1;
/* Load I/O control configuration to Input / Output Control Register */
outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_signal_cable_fault_read(struct counter_device *counter,
struct counter_signal *signal,
u8 *cable_fault)
{
struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id / 2;
bool disabled;
unsigned int status;
mutex_lock(&priv->lock);
disabled = !(priv->cable_fault_enable & BIT(channel_id));
if (disabled) {
mutex_unlock(&priv->lock);
return -EINVAL;
}
/* Logic 0 = cable fault */
status = inb(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
mutex_unlock(&priv->lock);
/* Mask respective channel and invert logic */
*cable_fault = !(status & BIT(channel_id));
return 0;
}
static int quad8_signal_cable_fault_enable_read(struct counter_device *counter,
struct counter_signal *signal,
u8 *enable)
{
const struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id / 2;
*enable = !!(priv->cable_fault_enable & BIT(channel_id));
return 0;
}
static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
struct counter_signal *signal,
u8 enable)
{
struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id / 2;
unsigned int cable_fault_enable;
mutex_lock(&priv->lock);
if (enable)
priv->cable_fault_enable |= BIT(channel_id);
else
priv->cable_fault_enable &= ~BIT(channel_id);
/* Enable is active low in Differential Encoder Cable Status register */
cable_fault_enable = ~priv->cable_fault_enable;
outb(cable_fault_enable, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
mutex_unlock(&priv->lock);
return 0;
}
static int quad8_signal_fck_prescaler_read(struct counter_device *counter,
struct counter_signal *signal,
u8 *prescaler)
{
const struct quad8 *const priv = counter->priv;
*prescaler = priv->fck_prescaler[signal->id / 2];
return 0;
}
static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
struct counter_signal *signal,
u8 prescaler)
{
struct quad8 *const priv = counter->priv;
const size_t channel_id = signal->id / 2;
const int base_offset = priv->base + 2 * channel_id;
mutex_lock(&priv->lock);
priv->fck_prescaler[channel_id] = prescaler;
/* Reset Byte Pointer */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Set filter clock factor */
outb(prescaler, base_offset);
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
base_offset + 1);
mutex_unlock(&priv->lock);
return 0;
}
static struct counter_comp quad8_signal_ext[] = {
COUNTER_COMP_SIGNAL_BOOL("cable_fault", quad8_signal_cable_fault_read,
NULL),
COUNTER_COMP_SIGNAL_BOOL("cable_fault_enable",
quad8_signal_cable_fault_enable_read,
quad8_signal_cable_fault_enable_write),
COUNTER_COMP_SIGNAL_U8("filter_clock_prescaler",
quad8_signal_fck_prescaler_read,
quad8_signal_fck_prescaler_write)
};
static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes);
static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes);
static struct counter_comp quad8_index_ext[] = {
COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get,
quad8_index_polarity_set,
quad8_index_pol_enum),
COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get,
quad8_synchronous_mode_set,
quad8_synch_mode_enum),
};
#define QUAD8_QUAD_SIGNAL(_id, _name) { \
.id = (_id), \
.name = (_name), \
.ext = quad8_signal_ext, \
.num_ext = ARRAY_SIZE(quad8_signal_ext) \
}
#define QUAD8_INDEX_SIGNAL(_id, _name) { \
.id = (_id), \
.name = (_name), \
.ext = quad8_index_ext, \
.num_ext = ARRAY_SIZE(quad8_index_ext) \
}
static struct counter_signal quad8_signals[] = {
QUAD8_QUAD_SIGNAL(0, "Channel 1 Quadrature A"),
QUAD8_QUAD_SIGNAL(1, "Channel 1 Quadrature B"),
QUAD8_QUAD_SIGNAL(2, "Channel 2 Quadrature A"),
QUAD8_QUAD_SIGNAL(3, "Channel 2 Quadrature B"),
QUAD8_QUAD_SIGNAL(4, "Channel 3 Quadrature A"),
QUAD8_QUAD_SIGNAL(5, "Channel 3 Quadrature B"),
QUAD8_QUAD_SIGNAL(6, "Channel 4 Quadrature A"),
QUAD8_QUAD_SIGNAL(7, "Channel 4 Quadrature B"),
QUAD8_QUAD_SIGNAL(8, "Channel 5 Quadrature A"),
QUAD8_QUAD_SIGNAL(9, "Channel 5 Quadrature B"),
QUAD8_QUAD_SIGNAL(10, "Channel 6 Quadrature A"),
QUAD8_QUAD_SIGNAL(11, "Channel 6 Quadrature B"),
QUAD8_QUAD_SIGNAL(12, "Channel 7 Quadrature A"),
QUAD8_QUAD_SIGNAL(13, "Channel 7 Quadrature B"),
QUAD8_QUAD_SIGNAL(14, "Channel 8 Quadrature A"),
QUAD8_QUAD_SIGNAL(15, "Channel 8 Quadrature B"),
QUAD8_INDEX_SIGNAL(16, "Channel 1 Index"),
QUAD8_INDEX_SIGNAL(17, "Channel 2 Index"),
QUAD8_INDEX_SIGNAL(18, "Channel 3 Index"),
QUAD8_INDEX_SIGNAL(19, "Channel 4 Index"),
QUAD8_INDEX_SIGNAL(20, "Channel 5 Index"),
QUAD8_INDEX_SIGNAL(21, "Channel 6 Index"),
QUAD8_INDEX_SIGNAL(22, "Channel 7 Index"),
QUAD8_INDEX_SIGNAL(23, "Channel 8 Index")
};
#define QUAD8_COUNT_SYNAPSES(_id) { \
{ \
.actions_list = quad8_synapse_actions_list, \
.num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \
.signal = quad8_signals + 2 * (_id) \
}, \
{ \
.actions_list = quad8_synapse_actions_list, \
.num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \
.signal = quad8_signals + 2 * (_id) + 1 \
}, \
{ \
.actions_list = quad8_index_actions_list, \
.num_actions = ARRAY_SIZE(quad8_index_actions_list), \
.signal = quad8_signals + 2 * (_id) + 16 \
} \
}
static struct counter_synapse quad8_count_synapses[][3] = {
QUAD8_COUNT_SYNAPSES(0), QUAD8_COUNT_SYNAPSES(1),
QUAD8_COUNT_SYNAPSES(2), QUAD8_COUNT_SYNAPSES(3),
QUAD8_COUNT_SYNAPSES(4), QUAD8_COUNT_SYNAPSES(5),
QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7)
};
static const enum counter_count_mode quad8_cnt_modes[] = {
COUNTER_COUNT_MODE_NORMAL,
COUNTER_COUNT_MODE_RANGE_LIMIT,
COUNTER_COUNT_MODE_NON_RECYCLE,
COUNTER_COUNT_MODE_MODULO_N,
};
static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes);
static DEFINE_COUNTER_ENUM(quad8_error_noise_enum, quad8_noise_error_states);
static struct counter_comp quad8_count_ext[] = {
COUNTER_COMP_CEILING(quad8_count_ceiling_read,
quad8_count_ceiling_write),
COUNTER_COMP_FLOOR(quad8_count_floor_read, NULL),
COUNTER_COMP_COUNT_MODE(quad8_count_mode_read, quad8_count_mode_write,
quad8_count_mode_available),
COUNTER_COMP_DIRECTION(quad8_direction_read),
COUNTER_COMP_ENABLE(quad8_count_enable_read, quad8_count_enable_write),
COUNTER_COMP_COUNT_ENUM("error_noise", quad8_error_noise_get, NULL,
quad8_error_noise_enum),
COUNTER_COMP_PRESET(quad8_count_preset_read, quad8_count_preset_write),
COUNTER_COMP_PRESET_ENABLE(quad8_count_preset_enable_read,
quad8_count_preset_enable_write),
};
#define QUAD8_COUNT(_id, _cntname) { \
.id = (_id), \
.name = (_cntname), \
.functions_list = quad8_count_functions_list, \
.num_functions = ARRAY_SIZE(quad8_count_functions_list), \
.synapses = quad8_count_synapses[(_id)], \
.num_synapses = 2, \
.ext = quad8_count_ext, \
.num_ext = ARRAY_SIZE(quad8_count_ext) \
}
static struct counter_count quad8_counts[] = {
QUAD8_COUNT(0, "Channel 1 Count"),
QUAD8_COUNT(1, "Channel 2 Count"),
QUAD8_COUNT(2, "Channel 3 Count"),
QUAD8_COUNT(3, "Channel 4 Count"),
QUAD8_COUNT(4, "Channel 5 Count"),
QUAD8_COUNT(5, "Channel 6 Count"),
QUAD8_COUNT(6, "Channel 7 Count"),
QUAD8_COUNT(7, "Channel 8 Count")
};
static int quad8_probe(struct device *dev, unsigned int id)
{
struct quad8 *priv;
int i, j;
unsigned int base_offset;
if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) {
dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
base[id], base[id] + QUAD8_EXTENT);
return -EBUSY;
}
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* Initialize Counter device and driver data */
priv->counter.name = dev_name(dev);
priv->counter.parent = dev;
priv->counter.ops = &quad8_ops;
priv->counter.counts = quad8_counts;
priv->counter.num_counts = ARRAY_SIZE(quad8_counts);
priv->counter.signals = quad8_signals;
priv->counter.num_signals = ARRAY_SIZE(quad8_signals);
priv->counter.priv = priv;
priv->base = base[id];
/* Initialize mutex */
mutex_init(&priv->lock);
/* Reset all counters and disable interrupt function */
outb(QUAD8_CHAN_OP_RESET_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);
/* Set initial configuration for all counters */
for (i = 0; i < QUAD8_NUM_COUNTERS; i++) {
base_offset = base[id] + 2 * i;
/* Reset Byte Pointer */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Reset filter clock factor */
outb(0, base_offset);
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
base_offset + 1);
/* Reset Byte Pointer */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Reset Preset Register */
for (j = 0; j < 3; j++)
outb(0x00, base_offset);
/* Reset Borrow, Carry, Compare, and Sign flags */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1);
/* Reset Error flag */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
/* Binary encoding; Normal count; non-quadrature mode */
outb(QUAD8_CTR_CMR, base_offset + 1);
/* Disable A and B inputs; preset on index; FLG1 as Carry */
outb(QUAD8_CTR_IOR, base_offset + 1);
/* Disable index function; negative index polarity */
outb(QUAD8_CTR_IDR, base_offset + 1);
}
/* Disable Differential Encoder Cable Status for all channels */
outb(0xFF, base[id] + QUAD8_DIFF_ENCODER_CABLE_STATUS);
/* Enable all counters */
outb(QUAD8_CHAN_OP_ENABLE_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);
return devm_counter_register(dev, &priv->counter);
}
static struct isa_driver quad8_driver = {
.probe = quad8_probe,
.driver = {
.name = "104-quad-8"
}
};
module_isa_driver(quad8_driver, num_quad8);
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
MODULE_DESCRIPTION("ACCES 104-QUAD-8 driver");
MODULE_LICENSE("GPL v2");