[PATCH v2 1/3] counter: 104-quad-8: Utilize bitfield access macros

William Breathitt Gray
2023-03-23T21:26:05Z

The 104-QUAD-8 features several registers with various bitfields.
Utilize bitfield access macros such as u8_get_bits() and
u8_encode_bits() to make the code easier to read and the intent clearer.

Suggested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
Changes in v2:
- Replace FIELD_PREP() and FIELD_GET() with u8_encode_bits() and
u8_get_bits()

drivers/counter/104-quad-8.c | 274 ++++++++++++++++++++++-------------
1 file changed, 172 insertions(+), 102 deletions(-)

diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
index d9cb937665cf..f07e4a9b946d 100644
--- a/drivers/counter/104-quad-8.c
+++ b/drivers/counter/104-quad-8.c
@@ -5,7 +5,8 @@
*
* This driver supports the ACCES 104-QUAD-8 and ACCES 104-QUAD-4.
*/
-#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
#include <linux/counter.h>
#include <linux/device.h>
#include <linux/errno.h>
@@ -98,36 +99,108 @@ struct quad8 {
};

/* Error flag */
-#define QUAD8_FLAG_E BIT(4)
+#define FLAG_E BIT(4)
/* Up/Down flag */
-#define QUAD8_FLAG_UD BIT(5)
+#define FLAG_UD BIT(5)
+
+#define REGISTER_SELECTION GENMASK(6, 5)
+
/* Reset and Load Signal Decoders */
-#define QUAD8_CTR_RLD 0x00
+#define SELECT_RLD u8_encode_bits(0x0, REGISTER_SELECTION)
/* Counter Mode Register */
-#define QUAD8_CTR_CMR 0x20
+#define SELECT_CMR u8_encode_bits(0x1, REGISTER_SELECTION)
/* Input / Output Control Register */
-#define QUAD8_CTR_IOR 0x40
+#define SELECT_IOR u8_encode_bits(0x2, REGISTER_SELECTION)
/* Index Control Register */
-#define QUAD8_CTR_IDR 0x60
+#define SELECT_IDR u8_encode_bits(0x3, REGISTER_SELECTION)
+
+/*
+ * Reset and Load Signal Decoders
+ */
+#define RESETS GENMASK(2, 1)
+#define LOADS GENMASK(4, 3)
/* 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
+#define RESET_BP BIT(0)
+/* Reset Borrow Toggle, Carry toggle, Compare toggle, Sign, and Index flags */
+#define RESET_BT_CT_CPT_S_IDX u8_encode_bits(0x2, RESETS)
/* Reset Error flag */
-#define QUAD8_RLD_RESET_E 0x06
+#define RESET_E u8_encode_bits(0x3, RESETS)
/* Preset Register to Counter */
-#define QUAD8_RLD_PRESET_CNTR 0x08
+#define TRANSFER_PR_TO_CNTR u8_encode_bits(0x1, LOADS)
/* Transfer Counter to Output Latch */
-#define QUAD8_RLD_CNTR_OUT 0x10
+#define TRANSFER_CNTR_TO_OL u8_encode_bits(0x2, LOADS)
/* Transfer Preset Register LSB to FCK Prescaler */
-#define QUAD8_RLD_PRESET_PSC 0x18
-#define QUAD8_CHAN_OP_RESET_COUNTERS 0x01
-#define QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC 0x04
-#define QUAD8_CMR_QUADRATURE_X1 0x08
-#define QUAD8_CMR_QUADRATURE_X2 0x10
-#define QUAD8_CMR_QUADRATURE_X4 0x18
+#define TRANSFER_PR0_TO_PSC u8_encode_bits(0x3, LOADS)
+
+/*
+ * Counter Mode Registers
+ */
+#define COUNT_ENCODING BIT(0)
+#define COUNT_MODE GENMASK(2, 1)
+#define QUADRATURE_MODE GENMASK(4, 3)
+/* Binary count */
+#define BINARY u8_encode_bits(0x0, COUNT_ENCODING)
+/* Normal count */
+#define NORMAL_COUNT 0x0
+/* Range Limit */
+#define RANGE_LIMIT 0x1
+/* Non-recycle count */
+#define NON_RECYCLE_COUNT 0x2
+/* Modulo-N */
+#define MODULO_N 0x3
+/* Non-quadrature */
+#define NON_QUADRATURE 0x0
+/* Quadrature X1 */
+#define QUADRATURE_X1 0x1
+/* Quadrature X2 */
+#define QUADRATURE_X2 0x2
+/* Quadrature X4 */
+#define QUADRATURE_X4 0x3
+
+/*
+ * Input/Output Control Register
+ */
+#define AB_GATE BIT(0)
+#define LOAD_PIN BIT(1)
+#define FLG_PINS GENMASK(4, 3)
+/* Disable inputs A and B */
+#define DISABLE_AB u8_encode_bits(0x0, AB_GATE)
+/* Load Counter input */
+#define LOAD_CNTR 0x0
+/* FLG1 = CARRY(active low); FLG2 = BORROW(active low) */
+#define FLG1_CARRY_FLG2_BORROW 0x0
+/* FLG1 = COMPARE(active low); FLG2 = BORROW(active low) */
+#define FLG1_COMPARE_FLG2_BORROW 0x1
+/* FLG1 = Carry(active low)/Borrow(active low); FLG2 = U/D(active low) flag */
+#define FLG1_CARRYBORROW_FLG2_UD 0x2
+/* FLG1 = INDX (low pulse at INDEX pin active level); FLG2 = E flag */
+#define FLG1_INDX_FLG2_E 0x3
+
+/*
+ * INDEX CONTROL REGISTERS
+ */
+#define INDEX_MODE BIT(0)
+#define INDEX_POLARITY BIT(1)
+/* Disable Index mode */
+#define DISABLE_INDEX_MODE 0x0
+/* Negative Index Polarity */
+#define NEGATIVE_INDEX_POLARITY 0x0
+
+/*
+ * Channel Operation Register
+ */
+#define COUNTERS_OPERATION BIT(0)
+#define INTERRUPT_FUNCTION BIT(2)
+/* Enable all Counters */
+#define ENABLE_COUNTERS u8_encode_bits(0x0, COUNTERS_OPERATION)
+/* Reset all Counters */
+#define RESET_COUNTERS u8_encode_bits(0x1, COUNTERS_OPERATION)
+/* Disable the interrupt function */
+#define DISABLE_INTERRUPT_FUNCTION u8_encode_bits(0x0, INTERRUPT_FUNCTION)
+/* Enable the interrupt function */
+#define ENABLE_INTERRUPT_FUNCTION u8_encode_bits(0x1, INTERRUPT_FUNCTION)
+/* Any write to the Channel Operation register clears any pending interrupts */
+#define CLEAR_PENDING_INTERRUPTS (ENABLE_COUNTERS | ENABLE_INTERRUPT_FUNCTION)

/* Each Counter is 24 bits wide */
#define LS7267_CNTR_MAX GENMASK(23, 0)
@@ -162,9 +235,7 @@ static int quad8_count_read(struct counter_device *counter,

spin_lock_irqsave(&priv->lock, irqflags);

- /* Reset Byte Pointer; transfer Counter to Output Latch */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,
- &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP | TRANSFER_CNTR_TO_OL, &chan->control);

for (i = 0; i < 3; i++)
*val |= (unsigned long)ioread8(&chan->data) << (8 * i);
@@ -187,28 +258,23 @@ static int quad8_count_write(struct counter_device *counter,

spin_lock_irqsave(&priv->lock, irqflags);

- /* Reset Byte Pointer */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP, &chan->control);

/* Counter can only be set via Preset Register */
for (i = 0; i < 3; i++)
iowrite8(val >> (8 * i), &chan->data);

- /* Transfer Preset Register to Counter */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, &chan->control);
+ iowrite8(SELECT_RLD | TRANSFER_PR_TO_CNTR, &chan->control);

- /* Reset Byte Pointer */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP, &chan->control);

/* Set Preset Register back to original value */
val = priv->preset[count->id];
for (i = 0; i < 3; i++)
iowrite8(val >> (8 * i), &chan->data);

- /* Reset Borrow, Carry, Compare, and Sign flags */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control);
- /* Reset Error flag */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BT_CT_CPT_S_IDX, &chan->control);
+ iowrite8(SELECT_RLD | RESET_E, &chan->control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -279,8 +345,8 @@ static int quad8_function_write(struct counter_device *counter,

spin_lock_irqsave(&priv->lock, irqflags);

- mode_cfg = priv->count_mode[id] << 1;
- idr_cfg = priv->index_polarity[id] << 1;
+ mode_cfg = u8_encode_bits(priv->count_mode[id], COUNT_MODE);
+ idr_cfg = u8_encode_bits(priv->index_polarity[id], INDEX_POLARITY);

if (function == COUNTER_FUNCTION_PULSE_DIRECTION) {
*quadrature_mode = 0;
@@ -288,11 +354,14 @@ static int quad8_function_write(struct counter_device *counter,
/* Quadrature scaling only available in quadrature mode */
*scale = 0;

+ mode_cfg |= u8_encode_bits(NON_QUADRATURE, QUADRATURE_MODE);
+
/* Synchronous function not supported in non-quadrature mode */
if (*synchronous_mode) {
*synchronous_mode = 0;
/* Disable synchronous function mode */
- iowrite8(QUAD8_CTR_IDR | idr_cfg, control);
+ idr_cfg |= u8_encode_bits(*synchronous_mode, INDEX_MODE);
+ iowrite8(SELECT_IDR | idr_cfg, control);
}
} else {
*quadrature_mode = 1;
@@ -300,15 +369,15 @@ static int quad8_function_write(struct counter_device *counter,
switch (function) {
case COUNTER_FUNCTION_QUADRATURE_X1_A:
*scale = 0;
- mode_cfg |= QUAD8_CMR_QUADRATURE_X1;
+ mode_cfg |= u8_encode_bits(QUADRATURE_X1, QUADRATURE_MODE);
break;
case COUNTER_FUNCTION_QUADRATURE_X2_A:
*scale = 1;
- mode_cfg |= QUAD8_CMR_QUADRATURE_X2;
+ mode_cfg |= u8_encode_bits(QUADRATURE_X2, QUADRATURE_MODE);
break;
case COUNTER_FUNCTION_QUADRATURE_X4:
*scale = 2;
- mode_cfg |= QUAD8_CMR_QUADRATURE_X4;
+ mode_cfg |= u8_encode_bits(QUADRATURE_X4, QUADRATURE_MODE);
break;
default:
/* should never reach this path */
@@ -318,7 +387,7 @@ static int quad8_function_write(struct counter_device *counter,
}

/* Load mode configuration to Counter Mode Register */
- iowrite8(QUAD8_CTR_CMR | mode_cfg, control);
+ iowrite8(SELECT_CMR | mode_cfg, control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -332,9 +401,11 @@ static int quad8_direction_read(struct counter_device *counter,
const struct quad8 *const priv = counter_priv(counter);
unsigned int ud_flag;
u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control;
+ u8 flag;

+ flag = ioread8(flag_addr);
/* U/D flag: nonzero = up, zero = down */
- ud_flag = ioread8(flag_addr) & QUAD8_FLAG_UD;
+ ud_flag = u8_get_bits(flag, FLAG_UD);

*direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD :
COUNTER_COUNT_DIRECTION_BACKWARD;
@@ -423,10 +494,10 @@ static int quad8_action_read(struct counter_device *counter,
}

enum {
- QUAD8_EVENT_CARRY = 0,
- QUAD8_EVENT_COMPARE = 1,
- QUAD8_EVENT_CARRY_BORROW = 2,
- QUAD8_EVENT_INDEX = 3,
+ QUAD8_EVENT_CARRY = FLG1_CARRY_FLG2_BORROW,
+ QUAD8_EVENT_COMPARE = FLG1_COMPARE_FLG2_BORROW,
+ QUAD8_EVENT_CARRY_BORROW = FLG1_CARRYBORROW_FLG2_UD,
+ QUAD8_EVENT_INDEX = FLG1_INDX_FLG2_E,
};

static int quad8_events_configure(struct counter_device *counter)
@@ -471,10 +542,10 @@ static int quad8_events_configure(struct counter_device *counter)
priv->irq_trigger[event_node->channel] = next_irq_trigger;

/* Load configuration to I/O Control Register */
- ior_cfg = priv->ab_enable[event_node->channel] |
- priv->preset_enable[event_node->channel] << 1 |
- priv->irq_trigger[event_node->channel] << 3;
- iowrite8(QUAD8_CTR_IOR | ior_cfg,
+ ior_cfg = u8_encode_bits(priv->ab_enable[event_node->channel], AB_GATE) |
+ u8_encode_bits(priv->preset_enable[event_node->channel], LOAD_PIN) |
+ u8_encode_bits(priv->irq_trigger[event_node->channel], FLG_PINS);
+ iowrite8(SELECT_IOR | ior_cfg,
&priv->reg->channel[event_node->channel].control);
}

@@ -544,16 +615,16 @@ static int quad8_index_polarity_set(struct counter_device *counter,
const size_t channel_id = signal->id - 16;
u8 __iomem *const control = &priv->reg->channel[channel_id].control;
unsigned long irqflags;
- unsigned int idr_cfg = index_polarity << 1;
+ unsigned int idr_cfg = u8_encode_bits(index_polarity, INDEX_POLARITY);

spin_lock_irqsave(&priv->lock, irqflags);

- idr_cfg |= priv->synchronous_mode[channel_id];
+ idr_cfg |= u8_encode_bits(priv->synchronous_mode[channel_id], INDEX_MODE);

priv->index_polarity[channel_id] = index_polarity;

/* Load Index Control configuration to Index Control Register */
- iowrite8(QUAD8_CTR_IDR | idr_cfg, control);
+ iowrite8(SELECT_IDR | idr_cfg, control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -611,11 +682,11 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
const size_t channel_id = signal->id - 16;
u8 __iomem *const control = &priv->reg->channel[channel_id].control;
unsigned long irqflags;
- unsigned int idr_cfg = synchronous_mode;
+ unsigned int idr_cfg = u8_encode_bits(synchronous_mode, INDEX_MODE);

spin_lock_irqsave(&priv->lock, irqflags);

- idr_cfg |= priv->index_polarity[channel_id] << 1;
+ idr_cfg |= u8_encode_bits(priv->index_polarity[channel_id], INDEX_POLARITY);

/* Index function must be non-synchronous in non-quadrature mode */
if (synchronous_mode && !priv->quadrature_mode[channel_id]) {
@@ -626,7 +697,7 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
priv->synchronous_mode[channel_id] = synchronous_mode;

/* Load Index Control configuration to Index Control Register */
- iowrite8(QUAD8_CTR_IDR | idr_cfg, control);
+ iowrite8(SELECT_IDR | idr_cfg, control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -648,18 +719,17 @@ static int quad8_count_mode_read(struct counter_device *counter,
{
const struct quad8 *const priv = counter_priv(counter);

- /* Map 104-QUAD-8 count mode to Generic Counter count mode */
switch (priv->count_mode[count->id]) {
- case 0:
+ case NORMAL_COUNT:
*cnt_mode = COUNTER_COUNT_MODE_NORMAL;
break;
- case 1:
+ case RANGE_LIMIT:
*cnt_mode = COUNTER_COUNT_MODE_RANGE_LIMIT;
break;
- case 2:
+ case NON_RECYCLE_COUNT:
*cnt_mode = COUNTER_COUNT_MODE_NON_RECYCLE;
break;
- case 3:
+ case MODULO_N:
*cnt_mode = COUNTER_COUNT_MODE_MODULO_N;
break;
}
@@ -677,19 +747,18 @@ static int quad8_count_mode_write(struct counter_device *counter,
u8 __iomem *const control = &priv->reg->channel[count->id].control;
unsigned long irqflags;

- /* Map Generic Counter count mode to 104-QUAD-8 count mode */
switch (cnt_mode) {
case COUNTER_COUNT_MODE_NORMAL:
- count_mode = 0;
+ count_mode = NORMAL_COUNT;
break;
case COUNTER_COUNT_MODE_RANGE_LIMIT:
- count_mode = 1;
+ count_mode = RANGE_LIMIT;
break;
case COUNTER_COUNT_MODE_NON_RECYCLE:
- count_mode = 2;
+ count_mode = NON_RECYCLE_COUNT;
break;
case COUNTER_COUNT_MODE_MODULO_N:
- count_mode = 3;
+ count_mode = MODULO_N;
break;
default:
/* should never reach this path */
@@ -701,14 +770,16 @@ static int quad8_count_mode_write(struct counter_device *counter,
priv->count_mode[count->id] = count_mode;

/* Set count mode configuration value */
- mode_cfg = count_mode << 1;
+ mode_cfg = u8_encode_bits(count_mode, COUNT_MODE);

/* Add quadrature mode configuration */
if (priv->quadrature_mode[count->id])
- mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3;
+ mode_cfg |= u8_encode_bits(priv->quadrature_scale[count->id] + 1, QUADRATURE_MODE);
+ else
+ mode_cfg |= u8_encode_bits(NON_QUADRATURE, QUADRATURE_MODE);

/* Load mode configuration to Counter Mode Register */
- iowrite8(QUAD8_CTR_CMR | mode_cfg, control);
+ iowrite8(SELECT_CMR | mode_cfg, control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -737,11 +808,12 @@ static int quad8_count_enable_write(struct counter_device *counter,

priv->ab_enable[count->id] = enable;

- ior_cfg = enable | priv->preset_enable[count->id] << 1 |
- priv->irq_trigger[count->id] << 3;
+ ior_cfg = u8_encode_bits(enable, AB_GATE) |
+ u8_encode_bits(priv->preset_enable[count->id], LOAD_PIN) |
+ u8_encode_bits(priv->irq_trigger[count->id], FLG_PINS);

/* Load I/O control configuration */
- iowrite8(QUAD8_CTR_IOR | ior_cfg, control);
+ iowrite8(SELECT_IOR | ior_cfg, control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -758,8 +830,10 @@ static int quad8_error_noise_get(struct counter_device *counter,
{
const struct quad8 *const priv = counter_priv(counter);
u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control;
+ u8 flag;

- *noise_error = !!(ioread8(flag_addr) & QUAD8_FLAG_E);
+ flag = ioread8(flag_addr);
+ *noise_error = u8_get_bits(flag, FLAG_E);

return 0;
}
@@ -782,8 +856,7 @@ static void quad8_preset_register_set(struct quad8 *const priv, const int id,

priv->preset[id] = preset;

- /* Reset Byte Pointer */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP, &chan->control);

/* Set Preset Register */
for (i = 0; i < 3; i++)
@@ -818,8 +891,8 @@ static int quad8_count_ceiling_read(struct counter_device *counter,

/* Range Limit and Modulo-N count modes use preset value as ceiling */
switch (priv->count_mode[count->id]) {
- case 1:
- case 3:
+ case RANGE_LIMIT:
+ case MODULO_N:
*ceiling = priv->preset[count->id];
break;
default:
@@ -845,8 +918,8 @@ static int quad8_count_ceiling_write(struct counter_device *counter,

/* Range Limit and Modulo-N count modes use preset value as ceiling */
switch (priv->count_mode[count->id]) {
- case 1:
- case 3:
+ case RANGE_LIMIT:
+ case MODULO_N:
quad8_preset_register_set(priv, count->id, ceiling);
spin_unlock_irqrestore(&priv->lock, irqflags);
return 0;
@@ -884,11 +957,12 @@ static int quad8_count_preset_enable_write(struct counter_device *counter,

priv->preset_enable[count->id] = preset_enable;

- ior_cfg = priv->ab_enable[count->id] | preset_enable << 1 |
- priv->irq_trigger[count->id] << 3;
+ ior_cfg = u8_encode_bits(priv->ab_enable[count->id], AB_GATE) |
+ u8_encode_bits(preset_enable, LOAD_PIN) |
+ u8_encode_bits(priv->irq_trigger[count->id], FLG_PINS);

/* Load I/O control configuration to Input / Output Control Register */
- iowrite8(QUAD8_CTR_IOR | ior_cfg, control);
+ iowrite8(SELECT_IOR | ior_cfg, control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -987,13 +1061,11 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter,

priv->fck_prescaler[channel_id] = prescaler;

- /* Reset Byte Pointer */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP, &chan->control);

/* Set filter clock factor */
iowrite8(prescaler, &chan->data);
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
- &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP | TRANSFER_PR0_TO_PSC, &chan->control);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -1183,7 +1255,7 @@ static irqreturn_t quad8_irq_handler(int irq, void *private)
}

/* Clear pending interrupts on device */
- iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper);
+ iowrite8(CLEAR_PENDING_INTERRUPTS, &priv->reg->channel_oper);

return IRQ_HANDLED;
}
@@ -1192,27 +1264,25 @@ static void quad8_init_counter(struct channel_reg __iomem *const chan)
{
unsigned long i;

- /* Reset Byte Pointer */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP, &chan->control);
/* Reset filter clock factor */
iowrite8(0, &chan->data);
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
- &chan->control);
- /* Reset Byte Pointer */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP | TRANSFER_PR0_TO_PSC, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BP, &chan->control);
/* Reset Preset Register */
for (i = 0; i < 3; i++)
iowrite8(0x00, &chan->data);
- /* Reset Borrow, Carry, Compare, and Sign flags */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control);
- /* Reset Error flag */
- iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control);
+ iowrite8(SELECT_RLD | RESET_BT_CT_CPT_S_IDX, &chan->control);
+ iowrite8(SELECT_RLD | RESET_E, &chan->control);
/* Binary encoding; Normal count; non-quadrature mode */
- iowrite8(QUAD8_CTR_CMR, &chan->control);
+ iowrite8(SELECT_CMR | BINARY | u8_encode_bits(NORMAL_COUNT, COUNT_MODE) |
+ u8_encode_bits(NON_QUADRATURE, QUADRATURE_MODE), &chan->control);
/* Disable A and B inputs; preset on index; FLG1 as Carry */
- iowrite8(QUAD8_CTR_IOR, &chan->control);
+ iowrite8(SELECT_IOR | DISABLE_AB | u8_encode_bits(LOAD_CNTR, LOAD_PIN) |
+ u8_encode_bits(FLG1_CARRY_FLG2_BORROW, FLG_PINS), &chan->control);
/* Disable index function; negative index polarity */
- iowrite8(QUAD8_CTR_IDR, &chan->control);
+ iowrite8(SELECT_IDR | u8_encode_bits(DISABLE_INDEX_MODE, INDEX_MODE) |
+ u8_encode_bits(NEGATIVE_INDEX_POLARITY, INDEX_POLARITY), &chan->control);
}

static int quad8_probe(struct device *dev, unsigned int id)
@@ -1251,14 +1321,14 @@ static int quad8_probe(struct device *dev, unsigned int id)
/* Reset Index/Interrupt Register */
iowrite8(0x00, &priv->reg->index_interrupt);
/* Reset all counters and disable interrupt function */
- iowrite8(QUAD8_CHAN_OP_RESET_COUNTERS, &priv->reg->channel_oper);
+ iowrite8(RESET_COUNTERS | DISABLE_INTERRUPT_FUNCTION, &priv->reg->channel_oper);
/* Set initial configuration for all counters */
for (i = 0; i < QUAD8_NUM_COUNTERS; i++)
quad8_init_counter(priv->reg->channel + i);
/* Disable Differential Encoder Cable Status for all channels */
iowrite8(0xFF, &priv->reg->cable_status);
/* Enable all counters and enable interrupt function */
- iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper);
+ iowrite8(ENABLE_COUNTERS | ENABLE_INTERRUPT_FUNCTION, &priv->reg->channel_oper);

err = devm_request_irq(&counter->dev, irq[id], quad8_irq_handler,
IRQF_SHARED, counter->name, counter);
--
2.39.2