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SubjectRe: [PATCH v4 5/5] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8
On Wed, Jul 22, 2020 at 1:06 AM William Breathitt Gray
<vilhelm.gray@gmail.com> wrote:
>
> The LSI/CSI LS7266R1 chip provides programmable output via the FLG pins.
> When interrupts are enabled on the ACCES 104-QUAD-8, they occur whenever
> FLG1 is active. Four functions are available for the FLG1 signal: Carry,
> Compare, Carry-Borrow, and Index.
>
> Carry:
> Interrupt generated on active low Carry signal. Carry
> signal toggles every time the respective channel's
> counter overflows.
>
> Compare:
> Interrupt generated on active low Compare signal.
> Compare signal toggles every time respective channel's
> preset register is equal to the respective channel's
> counter.
>
> Carry-Borrow:
> Interrupt generated on active low Carry signal and
> active low Borrow signal. Carry signal toggles every
> time the respective channel's counter overflows. Borrow
> signal toggles every time the respective channel's
> counter underflows.
>
> Index:
> Interrupt generated on active high Index signal.
>
> The irq_trigger Count extension is introduced to allow the selection of
> the desired IRQ trigger function per channel. The irq_trigger_enable
> Count extension is introduced to allow the enablement of interrupts for
> a respective channel. Interrupts push Counter events as Event X, where
> 'X' is the respective channel whose FLG1 activated.
>
> This patch adds IRQ support for the ACCES 104-QUAD-8. The interrupt line
> numbers for the devices may be configured via the irq array module
> parameter.
>
> Cc: Syed Nayyar Waris <syednwaris@gmail.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
> ---
> .../ABI/testing/sysfs-bus-counter-104-quad-8 | 32 ++
> drivers/counter/104-quad-8.c | 283 +++++++++++++-----
> drivers/counter/Kconfig | 6 +-
> 3 files changed, 249 insertions(+), 72 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8 b/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
> index eac32180c40d..718f6199c71e 100644
> --- a/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
> +++ b/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
> @@ -1,3 +1,35 @@
> +What: /sys/bus/counter/devices/counterX/countY/irq_trigger
> +KernelVersion: 5.9
> +Contact: linux-iio@vger.kernel.org
> +Description:
> + IRQ trigger function for channel Y. Four trigger functions are
> + available: carry, compare, carry-borrow, and index.
> +
> + carry:
> + Interrupt generated on active low Carry signal. Carry
> + signal toggles every time channel Y counter overflows.
> +
> + compare:
> + Interrupt generated on active low Compare signal.
> + Compare signal toggles every time channel Y preset
> + register is equal to channel Y counter.
> +
> + carry-borrow:
> + Interrupt generated on active low Carry signal and
> + active low Borrow signal. Carry signal toggles every
> + time channel Y counter overflows. Borrow signal toggles
> + every time channel Y counter underflows.
> +
> + index:
> + Interrupt generated on active high Index signal.
> +
> +What: /sys/bus/counter/devices/counterX/countY/irq_trigger_enable
> +KernelVersion: 5.9
> +Contact: linux-iio@vger.kernel.org
> +Description:
> + Whether generation of interrupts is enabled for channel Y. Valid
> + attribute values are boolean.
> +
> What: /sys/bus/counter/devices/counterX/signalY/cable_fault
> KernelVersion: 5.7
> Contact: linux-iio@vger.kernel.org
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index 0f20920073d6..b43be2d5464d 100644
> --- a/drivers/counter/104-quad-8.c
> +++ b/drivers/counter/104-quad-8.c
> @@ -13,23 +13,30 @@
> #include <linux/iio/types.h>
> #include <linux/io.h>
> #include <linux/ioport.h>
> +#include <linux/interrupt.h>
> #include <linux/isa.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/moduleparam.h>
> #include <linux/types.h>
> +#include <linux/spinlock.h>
>
> #define QUAD8_EXTENT 32
>
> static unsigned int base[max_num_isa_dev(QUAD8_EXTENT)];
> static unsigned int num_quad8;
> -module_param_array(base, uint, &num_quad8, 0);
> +module_param_hw_array(base, uint, ioport, &num_quad8, 0);
> MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
>
> +static unsigned int irq[max_num_isa_dev(QUAD8_EXTENT)];
> +module_param_hw_array(irq, uint, irq, NULL, 0);
> +MODULE_PARM_DESC(irq, "ACCES 104-QUAD-8 interrupt line numbers");
> +
> #define QUAD8_NUM_COUNTERS 8
>
> /**
> * struct quad8_iio - IIO device private data structure
> + * @lock: synchronization lock to prevent I/O race conditions
> * @counter: instance of the counter_device
> * @fck_prescaler: array of filter clock prescaler configurations
> * @preset: array of preset values
> @@ -38,13 +45,14 @@ MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
> * @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
> + * @irq_trigger: array of interrupt trigger function 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 IIO device
> */
> struct quad8_iio {
> - struct mutex lock;
> + raw_spinlock_t lock;
> struct counter_device counter;
> unsigned int fck_prescaler[QUAD8_NUM_COUNTERS];
> unsigned int preset[QUAD8_NUM_COUNTERS];
> @@ -53,13 +61,16 @@ struct quad8_iio {
> unsigned int quadrature_scale[QUAD8_NUM_COUNTERS];
> unsigned int ab_enable[QUAD8_NUM_COUNTERS];
> unsigned int preset_enable[QUAD8_NUM_COUNTERS];
> + unsigned int irq_trigger[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_INTERRUPT_STATUS 0x10
> #define QUAD8_REG_CHAN_OP 0x11
> +#define QUAD8_REG_INDEX_INTERRUPT 0x12
> #define QUAD8_REG_INDEX_INPUT_LEVELS 0x16
> #define QUAD8_DIFF_ENCODER_CABLE_STATUS 0x17
> /* Borrow Toggle flip-flop */
> @@ -92,8 +103,8 @@ struct quad8_iio {
> #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_CHAN_OP_ENABLE_INTERRUPT_FUNC 0x04
> #define QUAD8_CMR_QUADRATURE_X1 0x08
> #define QUAD8_CMR_QUADRATURE_X2 0x10
> #define QUAD8_CMR_QUADRATURE_X4 0x18
> @@ -107,6 +118,7 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
> unsigned int flags;
> unsigned int borrow;
> unsigned int carry;
> + unsigned long irqflags;
> int i;
>
> switch (mask) {
> @@ -124,7 +136,7 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
> /* Borrow XOR Carry effectively doubles count range */
> *val = (borrow ^ carry) << 24;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> /* Reset Byte Pointer; transfer Counter to Output Latch */
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,
> @@ -133,7 +145,7 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
> for (i = 0; i < 3; i++)
> *val |= (unsigned int)inb(base_offset) << (8 * i);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_ENABLE:
> @@ -153,6 +165,7 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
> {
> struct quad8_iio *const priv = iio_priv(indio_dev);
> const int base_offset = priv->base + 2 * chan->channel;
> + unsigned long flags;
> int i;
> unsigned int ior_cfg;
>
> @@ -165,7 +178,7 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
> if ((unsigned int)val > 0xFFFFFF)
> return -EINVAL;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, flags);
>
> /* Reset Byte Pointer */
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
> @@ -190,7 +203,7 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
> /* Reset Error flag */
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, flags);
>
> return 0;
> case IIO_CHAN_INFO_ENABLE:
> @@ -198,25 +211,26 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
> if (val < 0 || val > 1)
> return -EINVAL;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, flags);
>
> priv->ab_enable[chan->channel] = val;
>
> - ior_cfg = val | priv->preset_enable[chan->channel] << 1;
> + ior_cfg = val | priv->preset_enable[chan->channel] << 1 |
> + priv->irq_trigger[chan->channel] << 3;
>
> /* Load I/O control configuration */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, flags);
>
> return 0;
> case IIO_CHAN_INFO_SCALE:
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, flags);
>
> /* Quadrature scaling only available in quadrature mode */
> if (!priv->quadrature_mode[chan->channel] &&
> (val2 || val != 1)) {
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, flags);
> return -EINVAL;
> }
>
> @@ -232,15 +246,15 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
> priv->quadrature_scale[chan->channel] = 2;
> break;
> default:
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, flags);
> return -EINVAL;
> }
> else {
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, flags);
> return -EINVAL;
> }
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, flags);
> return 0;
> }
>
> @@ -266,6 +280,7 @@ static ssize_t quad8_write_preset(struct iio_dev *indio_dev, uintptr_t private,
> struct quad8_iio *const priv = iio_priv(indio_dev);
> const int base_offset = priv->base + 2 * chan->channel;
> unsigned int preset;
> + unsigned long irqflags;
> int ret;
> int i;
>
> @@ -277,7 +292,7 @@ static ssize_t quad8_write_preset(struct iio_dev *indio_dev, uintptr_t private,
> if (preset > 0xFFFFFF)
> return -EINVAL;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->preset[chan->channel] = preset;
>
> @@ -288,7 +303,7 @@ static ssize_t quad8_write_preset(struct iio_dev *indio_dev, uintptr_t private,
> for (i = 0; i < 3; i++)
> outb(preset >> (8 * i), base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return len;
> }
> @@ -309,6 +324,7 @@ static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
> struct quad8_iio *const priv = iio_priv(indio_dev);
> const int base_offset = priv->base + 2 * chan->channel + 1;
> bool preset_enable;
> + unsigned long irqflags;
> int ret;
> unsigned int ior_cfg;
>
> @@ -319,17 +335,18 @@ static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
> /* Preset enable is active low in Input/Output Control register */
> preset_enable = !preset_enable;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->preset_enable[chan->channel] = preset_enable;
>
> ior_cfg = priv->ab_enable[chan->channel] |
> - (unsigned int)preset_enable << 1;
> + (unsigned int)preset_enable << 1 |
> + priv->irq_trigger[chan->channel] << 3;
>
> /* Load I/O control configuration to Input / Output Control Register */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return len;
> }
> @@ -387,8 +404,9 @@ static int quad8_set_count_mode(struct iio_dev *indio_dev,
> struct quad8_iio *const priv = iio_priv(indio_dev);
> unsigned int mode_cfg = cnt_mode << 1;
> const int base_offset = priv->base + 2 * chan->channel + 1;
> + unsigned long irqflags;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->count_mode[chan->channel] = cnt_mode;
>
> @@ -399,7 +417,7 @@ static int quad8_set_count_mode(struct iio_dev *indio_dev,
> /* Load mode configuration to Counter Mode Register */
> outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -430,14 +448,15 @@ static int quad8_set_synchronous_mode(struct iio_dev *indio_dev,
> struct quad8_iio *const priv = iio_priv(indio_dev);
> const int base_offset = priv->base + 2 * chan->channel + 1;
> unsigned int idr_cfg = synchronous_mode;
> + unsigned long irqflags;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> idr_cfg |= priv->index_polarity[chan->channel] << 1;
>
> /* Index function must be non-synchronous in non-quadrature mode */
> if (synchronous_mode && !priv->quadrature_mode[chan->channel]) {
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
> return -EINVAL;
> }
>
> @@ -446,7 +465,7 @@ static int quad8_set_synchronous_mode(struct iio_dev *indio_dev,
> /* Load Index Control configuration to Index Control Register */
> outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -476,9 +495,10 @@ static int quad8_set_quadrature_mode(struct iio_dev *indio_dev,
> {
> struct quad8_iio *const priv = iio_priv(indio_dev);
> const int base_offset = priv->base + 2 * chan->channel + 1;
> + unsigned long irqflags;
> unsigned int mode_cfg;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> mode_cfg = priv->count_mode[chan->channel] << 1;
>
> @@ -498,7 +518,7 @@ static int quad8_set_quadrature_mode(struct iio_dev *indio_dev,
> /* Load mode configuration to Counter Mode Register */
> outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -529,8 +549,9 @@ static int quad8_set_index_polarity(struct iio_dev *indio_dev,
> struct quad8_iio *const priv = iio_priv(indio_dev);
> const int base_offset = priv->base + 2 * chan->channel + 1;
> unsigned int idr_cfg = index_polarity << 1;
> + unsigned long irqflags;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> idr_cfg |= priv->synchronous_mode[chan->channel];
>
> @@ -539,7 +560,7 @@ static int quad8_set_index_polarity(struct iio_dev *indio_dev,
> /* Load Index Control configuration to Index Control Register */
> outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -646,6 +667,7 @@ static int quad8_count_read(struct counter_device *counter,
> unsigned int flags;
> unsigned int borrow;
> unsigned int carry;
> + unsigned long irqflags;
> int i;
>
> flags = inb(base_offset + 1);
> @@ -655,7 +677,7 @@ static int quad8_count_read(struct counter_device *counter,
> /* Borrow XOR Carry effectively doubles count range */
> *val = (unsigned long)(borrow ^ carry) << 24;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> /* Reset Byte Pointer; transfer Counter to Output Latch */
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,
> @@ -664,7 +686,7 @@ static int quad8_count_read(struct counter_device *counter,
> for (i = 0; i < 3; i++)
> *val |= (unsigned long)inb(base_offset) << (8 * i);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -674,13 +696,14 @@ static int quad8_count_write(struct counter_device *counter,
> {
> struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> + unsigned long irqflags;
> int i;
>
> /* Only 24-bit values are supported */
> if (val > 0xFFFFFF)
> return -EINVAL;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> /* Reset Byte Pointer */
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
> @@ -705,7 +728,7 @@ static int quad8_count_write(struct counter_device *counter,
> /* Reset Error flag */
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -723,8 +746,9 @@ static int quad8_function_read(struct counter_device *counter,
> {
> struct quad8_iio *const priv = counter->priv;
> const int id = count->id;
> + unsigned long irqflags;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> if (priv->quadrature_mode[id])
> switch (priv->quadrature_scale[id]) {
> @@ -741,7 +765,7 @@ static int quad8_function_read(struct counter_device *counter,
> else
> *function = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION;
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -755,10 +779,11 @@ static int quad8_function_write(struct counter_device *counter,
> 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 long irqflags;
> unsigned int mode_cfg;
> unsigned int idr_cfg;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> mode_cfg = priv->count_mode[id] << 1;
> idr_cfg = priv->index_polarity[id] << 1;
> @@ -797,7 +822,7 @@ static int quad8_function_write(struct counter_device *counter,
> /* Load mode configuration to Counter Mode Register */
> outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -906,9 +931,10 @@ static int quad8_index_polarity_set(struct counter_device *counter,
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id - 16;
> const int base_offset = priv->base + 2 * channel_id + 1;
> + unsigned long irqflags;
> unsigned int idr_cfg;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->index_polarity[channel_id] = index_polarity;
>
> @@ -916,7 +942,7 @@ static int quad8_index_polarity_set(struct counter_device *counter,
> idr_cfg = priv->synchronous_mode[channel_id] | index_polarity << 1;
> outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -940,13 +966,14 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id - 16;
> const int base_offset = priv->base + 2 * channel_id + 1;
> + unsigned long irqflags;
> unsigned int idr_cfg;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> /* Index function must be non-synchronous in non-quadrature mode */
> if (synchronous_mode && !priv->quadrature_mode[channel_id]) {
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
> return -EINVAL;
> }
>
> @@ -956,7 +983,7 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
> idr_cfg = synchronous_mode | priv->index_polarity[channel_id] << 1;
> outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1001,6 +1028,7 @@ static int quad8_count_mode_write(struct counter_device *counter,
> unsigned int count_mode;
> unsigned int mode_cfg;
> const int base_offset = priv->base + 2 * count->id + 1;
> + unsigned long irqflags;
>
> /* Map Generic Counter count mode to 104-QUAD-8 count mode */
> switch (cnt_mode) {
> @@ -1018,7 +1046,7 @@ static int quad8_count_mode_write(struct counter_device *counter,
> break;
> }
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->count_mode[count->id] = count_mode;
>
> @@ -1032,7 +1060,7 @@ static int quad8_count_mode_write(struct counter_device *counter,
> /* Load mode configuration to Counter Mode Register */
> outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1052,18 +1080,20 @@ static int quad8_count_enable_write(struct counter_device *counter,
> {
> struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> + unsigned long irqflags;
> unsigned int ior_cfg;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->ab_enable[count->id] = enable;
>
> - ior_cfg = enable | priv->preset_enable[count->id] << 1;
> + ior_cfg = enable | priv->preset_enable[count->id] << 1 |
> + priv->irq_trigger[count->id] << 3;
>
> /* Load I/O control configuration */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1109,16 +1139,17 @@ static int quad8_count_preset_write(struct counter_device *counter,
> struct counter_count *count, u64 preset)
> {
> struct quad8_iio *const priv = counter->priv;
> + unsigned long irqflags;
>
> /* Only 24-bit values are supported */
> if (preset > 0xFFFFFF)
> return -EINVAL;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> quad8_preset_register_set(priv, count->id, preset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1127,18 +1158,19 @@ static int quad8_count_ceiling_read(struct counter_device *counter,
> struct counter_count *count, u64 *ceiling)
> {
> struct quad8_iio *const priv = counter->priv;
> + unsigned long irqflags;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> /* Range Limit and Modulo-N count modes use preset value as ceiling */
> switch (priv->count_mode[count->id]) {
> case 1:
> case 3:
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
> return quad8_count_preset_read(counter, count, ceiling);
> }
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */
> *ceiling = 0x1FFFFFF;
> @@ -1150,12 +1182,13 @@ static int quad8_count_ceiling_write(struct counter_device *counter,
> struct counter_count *count, u64 ceiling)
> {
> struct quad8_iio *const priv = counter->priv;
> + unsigned long irqflags;
>
> /* Only 24-bit values are supported */
> if (ceiling > 0xFFFFFF)
> return -EINVAL;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> /* Range Limit and Modulo-N count modes use preset value as ceiling */
> switch (priv->count_mode[count->id]) {
> @@ -1164,7 +1197,7 @@ static int quad8_count_ceiling_write(struct counter_device *counter,
> return quad8_count_preset_write(counter, count, ceiling);
> }
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return -EINVAL;
> }
> @@ -1186,21 +1219,91 @@ static int quad8_count_preset_enable_write(struct counter_device *counter,
> {
> struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id + 1;
> + unsigned long irqflags;
> unsigned int ior_cfg;
>
> /* Preset enable is active low in Input/Output Control register */
> preset_enable = !preset_enable;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->preset_enable[count->id] = preset_enable;
>
> - ior_cfg = priv->ab_enable[count->id] | preset_enable << 1;
> + ior_cfg = priv->ab_enable[count->id] | preset_enable << 1 |
> + priv->irq_trigger[count->id] << 3;
> +
> + /* Load I/O control configuration to Input / Output Control Register */
> + outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
> +
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
> +
> + return 0;
> +}
> +
> +static int quad8_irq_trigger_get(struct counter_device *counter,
> + struct counter_count *count, u8 *irq_trigger)
> +{
> + const struct quad8_iio *const priv = counter->priv;
> +
> + *irq_trigger = priv->irq_trigger[count->id];
> +
> + return 0;
> +}
> +
> +static int quad8_irq_trigger_set(struct counter_device *counter,
> + struct counter_count *count, u8 irq_trigger)
> +{
> + struct quad8_iio *const priv = counter->priv;
> + const unsigned long base_offset = priv->base + 2 * count->id + 1;
> + unsigned long irqflags;
> + unsigned long ior_cfg;
> +
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
> +
> + priv->irq_trigger[count->id] = irq_trigger;
> +
> + ior_cfg = priv->ab_enable[count->id] |
> + priv->preset_enable[count->id] << 1 | irq_trigger << 3;
>
> /* Load I/O control configuration to Input / Output Control Register */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
> +
> + return 0;
> +}
> +
> +static int quad8_irq_trigger_enable_read(struct counter_device *counter,
> + struct counter_count *count, u8 *state)
> +{
> + const struct quad8_iio *const priv = counter->priv;
> + unsigned long irq_enabled;
> +
> + irq_enabled = inb(priv->base + QUAD8_REG_INDEX_INTERRUPT);
> + *state = !!(irq_enabled & BIT(count->id));
> +
> + return 0;
> +}
> +
> +static int quad8_irq_trigger_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 state)
> +{
> + struct quad8_iio *const priv = counter->priv;
> + unsigned long irqflags;
> + unsigned long irq_enabled;
> +
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
> +
> + irq_enabled = inb(priv->base + QUAD8_REG_INDEX_INTERRUPT);
> +
> + if (state)
> + irq_enabled |= BIT(count->id);
> + else
> + irq_enabled &= ~BIT(count->id);
> +
> + outb(irq_enabled, priv->base + QUAD8_REG_INDEX_INTERRUPT);
> +
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1211,22 +1314,23 @@ static int quad8_signal_cable_fault_read(struct counter_device *counter,
> {
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> + unsigned long irqflags;
> bool disabled;
> unsigned int status;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> disabled = !(priv->cable_fault_enable & BIT(channel_id));
>
> if (disabled) {
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
> return -EINVAL;
> }
>
> /* Logic 0 = cable fault */
> status = inb(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> /* Mask respective channel and invert logic */
> *cable_fault = !(status & BIT(channel_id));
> @@ -1252,9 +1356,10 @@ static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
> {
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> + unsigned long irqflags;
> unsigned int cable_fault_enable;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> if (enable)
> priv->cable_fault_enable |= BIT(channel_id);
> @@ -1266,7 +1371,7 @@ static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
>
> outb(cable_fault_enable, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1289,8 +1394,9 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> const int base_offset = priv->base + 2 * channel_id;
> + unsigned long irqflags;
>
> - mutex_lock(&priv->lock);
> + raw_spin_lock_irqsave(&priv->lock, irqflags);
>
> priv->fck_prescaler[channel_id] = prescaler;
>
> @@ -1302,7 +1408,7 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
> base_offset + 1);
>
> - mutex_unlock(&priv->lock);
> + raw_spin_unlock_irqrestore(&priv->lock, irqflags);
>
> return 0;
> }
> @@ -1405,7 +1511,15 @@ static const u8 quad8_cnt_modes[] = {
>
> static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes);
>
> +static const char *const quad8_irq_trigger_states[] = {
> + "carry",
> + "compare",
> + "carry-borrow",
> + "index",
> +};
> +
> static DEFINE_COUNTER_ENUM(quad8_error_noise_enum, quad8_noise_error_states);
> +static DEFINE_COUNTER_ENUM(quad8_irq_trigger_enum, quad8_irq_trigger_states);
>
> static struct counter_data quad8_count_ext[] = {
> COUNTER_DATA_CEILING(quad8_count_ceiling_read,
> @@ -1420,6 +1534,11 @@ static struct counter_data quad8_count_ext[] = {
> COUNTER_DATA_PRESET(quad8_count_preset_read, quad8_count_preset_write),
> COUNTER_DATA_PRESET_ENABLE(quad8_count_preset_enable_read,
> quad8_count_preset_enable_write),
> + COUNTER_DATA_COUNT_ENUM("irq_trigger", quad8_irq_trigger_get,
> + quad8_irq_trigger_set, quad8_irq_trigger_enum),
> + COUNTER_DATA_COUNT_BOOL("irq_trigger_enable",
> + quad8_irq_trigger_enable_read,
> + quad8_irq_trigger_enable_write),
> };
>
> #define QUAD8_COUNT(_id, _cntname) { \
> @@ -1444,6 +1563,26 @@ static struct counter_count quad8_counts[] = {
> QUAD8_COUNT(7, "Channel 8 Count")
> };
>
> +static irqreturn_t quad8_irq_handler(int irq, void *quad8iio)
> +{
> + struct quad8_iio *const priv = quad8iio;
> + const unsigned long base = priv->base;
> + unsigned long irq_status;
> + unsigned long channel;
> +
> + irq_status = inb(base + QUAD8_REG_INTERRUPT_STATUS);
> + if (!irq_status)
> + return IRQ_NONE;
> +
> + for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS)
> + counter_push_event(&priv->counter, channel);
> +
> + /* Clear pending interrupts on device */
> + outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base + QUAD8_REG_CHAN_OP);
> +
> + return IRQ_HANDLED;
> +}
> +
> static int quad8_probe(struct device *dev, unsigned int id)
> {
> struct iio_dev *indio_dev;
> @@ -1487,9 +1626,10 @@ static int quad8_probe(struct device *dev, unsigned int id)
> quad8iio->counter.priv = quad8iio;
> quad8iio->base = base[id];
>
> - /* Initialize mutex */
> - mutex_init(&quad8iio->lock);
> + raw_spin_lock_init(&quad8iio->lock);
>
> + /* Reset Index/Interrupt Register */
> + outb(0x00, base[id] + QUAD8_REG_INDEX_INTERRUPT);
> /* 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 */
> @@ -1519,8 +1659,8 @@ static int quad8_probe(struct device *dev, unsigned int id)
> }
> /* 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);
> + /* Enable all counters and enable interrupt function */
> + outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base[id] + QUAD8_REG_CHAN_OP);
>
> /* Register IIO device */
> err = devm_iio_device_register(dev, indio_dev);
> @@ -1528,7 +1668,12 @@ static int quad8_probe(struct device *dev, unsigned int id)
> return err;
>
> /* Register Counter device */
> - return devm_counter_register(dev, &quad8iio->counter);
> + err = devm_counter_register(dev, &quad8iio->counter);
> + if (err)
> + return err;
> +
> + return devm_request_irq(dev, irq[id], quad8_irq_handler, IRQF_SHARED,
> + quad8iio->counter.name, quad8iio);
> }
>
> static struct isa_driver quad8_driver = {
> diff --git a/drivers/counter/Kconfig b/drivers/counter/Kconfig
> index 2de53ab0dd25..bd42df98f522 100644
> --- a/drivers/counter/Kconfig
> +++ b/drivers/counter/Kconfig
> @@ -23,11 +23,11 @@ config 104_QUAD_8
> A counter's respective error flag may be cleared by performing a write
> operation on the respective count value attribute. Although the
> 104-QUAD-8 counters have a 25-bit range, only the lower 24 bits may be
> - set, either directly or via the counter's preset attribute. Interrupts
> - are not supported by this driver.
> + set, either directly or via the counter's preset attribute.
>
> The base port addresses for the devices may be configured via the base
> - array module parameter.
> + array module parameter. The interrupt line numbers for the devices may
> + be configured via the irq array module parameter.
>
> config STM32_TIMER_CNT
> tristate "STM32 Timer encoder counter driver"
> --
> 2.27.0
>


Reviewed-by: Syed Nayyar Waris <syednwaris@gmail.com>

Thanks.

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