The Preset Register (PR), Flag Register (FLAG), and Filter Clock Prescaler (PSC) have common usage patterns. Wrap up such usage into dedicated functions to improve code clarity. Signed-off-by: William Breathitt Gray <william.gray@xxxxxxxxxx> --- drivers/counter/104-quad-8.c | 103 +++++++++++++++-------------------- 1 file changed, 45 insertions(+), 58 deletions(-) diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 796f02fc53b8..27ec905ebe85 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -241,41 +241,49 @@ static int quad8_count_read(struct counter_device *counter, return 0; } +static void quad8_preset_register_set(struct quad8 *const priv, const size_t id, + const unsigned long preset) +{ + struct channel_reg __iomem *const chan = priv->reg->channel + id; + int i; + + /* Reset Byte Pointer */ + iowrite8(SELECT_RLD | RESET_BP, &chan->control); + + /* Set Preset Register */ + for (i = 0; i < 3; i++) + iowrite8(preset >> (8 * i), &chan->data); +} + +static void quad8_flag_register_reset(struct quad8 *const priv, const size_t id) +{ + struct channel_reg __iomem *const chan = priv->reg->channel + id; + + /* Reset Borrow, Carry, Compare, and Sign flags */ + iowrite8(SELECT_RLD | RESET_BT_CT_CPT_S_IDX, &chan->control); + /* Reset Error flag */ + iowrite8(SELECT_RLD | RESET_E, &chan->control); +} + static int quad8_count_write(struct counter_device *counter, struct counter_count *count, u64 val) { struct quad8 *const priv = counter_priv(counter); struct channel_reg __iomem *const chan = priv->reg->channel + count->id; unsigned long irqflags; - int i; if (val > LS7267_CNTR_MAX) return -ERANGE; spin_lock_irqsave(&priv->lock, irqflags); - /* Reset Byte Pointer */ - 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); - + quad8_preset_register_set(priv, count->id, val); /* Transfer Preset Register to Counter */ iowrite8(SELECT_RLD | TRANSFER_PR_TO_CNTR, &chan->control); - - /* Reset Byte Pointer */ - iowrite8(SELECT_RLD | RESET_BP, &chan->control); - + quad8_flag_register_reset(priv, count->id); /* 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(SELECT_RLD | RESET_BT_CT_CPT_S_IDX, &chan->control); - /* Reset Error flag */ - iowrite8(SELECT_RLD | RESET_E, &chan->control); + quad8_preset_register_set(priv, count->id, priv->preset[count->id]); spin_unlock_irqrestore(&priv->lock, irqflags); @@ -791,22 +799,6 @@ static int quad8_count_preset_read(struct counter_device *counter, return 0; } -static void quad8_preset_register_set(struct quad8 *const priv, const int id, - const unsigned int preset) -{ - struct channel_reg __iomem *const chan = priv->reg->channel + id; - int i; - - priv->preset[id] = preset; - - /* Reset Byte Pointer */ - iowrite8(SELECT_RLD | RESET_BP, &chan->control); - - /* Set Preset Register */ - for (i = 0; i < 3; i++) - iowrite8(preset >> (8 * i), &chan->data); -} - static int quad8_count_preset_write(struct counter_device *counter, struct counter_count *count, u64 preset) { @@ -818,6 +810,7 @@ static int quad8_count_preset_write(struct counter_device *counter, spin_lock_irqsave(&priv->lock, irqflags); + priv->preset[count->id] = preset; quad8_preset_register_set(priv, count->id, preset); spin_unlock_irqrestore(&priv->lock, irqflags); @@ -864,6 +857,7 @@ static int quad8_count_ceiling_write(struct counter_device *counter, switch (FIELD_GET(COUNT_MODE, priv->cmr[count->id])) { case RANGE_LIMIT: case MODULO_N: + priv->preset[count->id] = ceiling; quad8_preset_register_set(priv, count->id, ceiling); spin_unlock_irqrestore(&priv->lock, irqflags); return 0; @@ -985,25 +979,30 @@ static int quad8_signal_fck_prescaler_read(struct counter_device *counter, return 0; } +static void quad8_filter_clock_prescaler_set(struct quad8 *const priv, const size_t id, + const u8 prescaler) +{ + struct channel_reg __iomem *const chan = priv->reg->channel + id; + + /* Reset Byte Pointer */ + iowrite8(SELECT_RLD | RESET_BP, &chan->control); + /* Reset filter clock factor */ + iowrite8(prescaler, &chan->data); + iowrite8(SELECT_RLD | TRANSFER_PR0_TO_PSC, &chan->control); +} + static int quad8_signal_fck_prescaler_write(struct counter_device *counter, struct counter_signal *signal, u8 prescaler) { struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id / 2; - struct channel_reg __iomem *const chan = priv->reg->channel + channel_id; unsigned long irqflags; spin_lock_irqsave(&priv->lock, irqflags); priv->fck_prescaler[channel_id] = prescaler; - - /* Reset Byte Pointer */ - iowrite8(SELECT_RLD | RESET_BP, &chan->control); - - /* Set filter clock factor */ - iowrite8(prescaler, &chan->data); - iowrite8(SELECT_RLD | RESET_BP | TRANSFER_PR0_TO_PSC, &chan->control); + quad8_filter_clock_prescaler_set(priv, channel_id, prescaler); spin_unlock_irqrestore(&priv->lock, irqflags); @@ -1203,22 +1202,10 @@ static irqreturn_t quad8_irq_handler(int irq, void *private) static void quad8_init_counter(struct quad8 *const priv, const size_t channel) { struct channel_reg __iomem *const chan = priv->reg->channel + channel; - unsigned long i; - /* Reset Byte Pointer */ - iowrite8(SELECT_RLD | RESET_BP, &chan->control); - /* Reset filter clock factor */ - iowrite8(0, &chan->data); - iowrite8(SELECT_RLD | RESET_BP | TRANSFER_PR0_TO_PSC, &chan->control); - /* Reset Byte Pointer */ - 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(SELECT_RLD | RESET_BT_CT_CPT_S_IDX, &chan->control); - /* Reset Error flag */ - iowrite8(SELECT_RLD | RESET_E, &chan->control); + quad8_filter_clock_prescaler_set(priv, channel, 0); + quad8_preset_register_set(priv, channel, 0); + quad8_flag_register_reset(priv, channel); /* Binary encoding; Normal count; non-quadrature mode */ priv->cmr[channel] = SELECT_CMR | BINARY | FIELD_PREP(COUNT_MODE, NORMAL_COUNT) | -- 2.39.2