diff options
Diffstat (limited to 'drivers/iio/addac/stx104.c')
-rw-r--r-- | drivers/iio/addac/stx104.c | 438 |
1 files changed, 243 insertions, 195 deletions
diff --git a/drivers/iio/addac/stx104.c b/drivers/iio/addac/stx104.c index 81020b710195..798f98a8872e 100644 --- a/drivers/iio/addac/stx104.c +++ b/drivers/iio/addac/stx104.c @@ -3,21 +3,20 @@ * IIO driver for the Apex Embedded Systems STX104 * Copyright (C) 2016 William Breathitt Gray */ +#include <linux/bitfield.h> #include <linux/bits.h> #include <linux/device.h> -#include <linux/errno.h> -#include <linux/gpio/driver.h> +#include <linux/err.h> +#include <linux/gpio/regmap.h> #include <linux/iio/iio.h> #include <linux/iio/types.h> -#include <linux/io.h> -#include <linux/ioport.h> #include <linux/isa.h> #include <linux/kernel.h> #include <linux/limits.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/mutex.h> -#include <linux/spinlock.h> +#include <linux/regmap.h> #include <linux/types.h> #define STX104_OUT_CHAN(chan) { \ @@ -47,107 +46,207 @@ static unsigned int num_stx104; module_param_hw_array(base, uint, ioport, &num_stx104, 0); MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses"); -/** - * struct stx104_reg - device register structure - * @ssr_ad: Software Strobe Register and ADC Data - * @achan: ADC Channel - * @dio: Digital I/O - * @dac: DAC Channels - * @cir_asr: Clear Interrupts and ADC Status - * @acr: ADC Control - * @pccr_fsh: Pacer Clock Control and FIFO Status MSB - * @acfg: ADC Configuration - */ -struct stx104_reg { - u16 ssr_ad; - u8 achan; - u8 dio; - u16 dac[2]; - u8 cir_asr; - u8 acr; - u8 pccr_fsh; - u8 acfg; -}; +#define STX104_AIO_BASE 0x0 +#define STX104_SOFTWARE_STROBE STX104_AIO_BASE +#define STX104_ADC_DATA STX104_AIO_BASE +#define STX104_ADC_CHANNEL (STX104_AIO_BASE + 0x2) +#define STX104_DIO_REG (STX104_AIO_BASE + 0x3) +#define STX104_DAC_BASE (STX104_AIO_BASE + 0x4) +#define STX104_ADC_STATUS (STX104_AIO_BASE + 0x8) +#define STX104_ADC_CONTROL (STX104_AIO_BASE + 0x9) +#define STX104_ADC_CONFIGURATION (STX104_AIO_BASE + 0x11) + +#define STX104_AIO_DATA_STRIDE 2 +#define STX104_DAC_OFFSET(_channel) (STX104_DAC_BASE + STX104_AIO_DATA_STRIDE * (_channel)) + +/* ADC Channel */ +#define STX104_FC GENMASK(3, 0) +#define STX104_LC GENMASK(7, 4) +#define STX104_SINGLE_CHANNEL(_channel) \ + (u8_encode_bits(_channel, STX104_FC) | u8_encode_bits(_channel, STX104_LC)) + +/* ADC Status */ +#define STX104_SD BIT(5) +#define STX104_CNV BIT(7) +#define STX104_DIFFERENTIAL 1 + +/* ADC Control */ +#define STX104_ALSS GENMASK(1, 0) +#define STX104_SOFTWARE_TRIGGER u8_encode_bits(0x0, STX104_ALSS) + +/* ADC Configuration */ +#define STX104_GAIN GENMASK(1, 0) +#define STX104_ADBU BIT(2) +#define STX104_BIPOLAR 0 +#define STX104_GAIN_X1 0 +#define STX104_GAIN_X2 1 +#define STX104_GAIN_X4 2 +#define STX104_GAIN_X8 3 /** * struct stx104_iio - IIO device private data structure * @lock: synchronization lock to prevent I/O race conditions - * @chan_out_states: channels' output states - * @reg: I/O address offset for the device registers + * @aio_data_map: Regmap for analog I/O data + * @aio_ctl_map: Regmap for analog I/O control */ struct stx104_iio { struct mutex lock; - unsigned int chan_out_states[STX104_NUM_OUT_CHAN]; - struct stx104_reg __iomem *reg; + struct regmap *aio_data_map; + struct regmap *aio_ctl_map; }; -/** - * struct stx104_gpio - GPIO device private data structure - * @chip: instance of the gpio_chip - * @lock: synchronization lock to prevent I/O race conditions - * @base: base port address of the GPIO device - * @out_state: output bits state - */ -struct stx104_gpio { - struct gpio_chip chip; - spinlock_t lock; - u8 __iomem *base; - unsigned int out_state; +static const struct regmap_range aio_ctl_wr_ranges[] = { + regmap_reg_range(0x0, 0x0), regmap_reg_range(0x2, 0x2), regmap_reg_range(0x9, 0x9), + regmap_reg_range(0x11, 0x11), +}; +static const struct regmap_range aio_ctl_rd_ranges[] = { + regmap_reg_range(0x2, 0x2), regmap_reg_range(0x8, 0x9), regmap_reg_range(0x11, 0x11), +}; +static const struct regmap_range aio_ctl_volatile_ranges[] = { + regmap_reg_range(0x8, 0x8), +}; +static const struct regmap_access_table aio_ctl_wr_table = { + .yes_ranges = aio_ctl_wr_ranges, + .n_yes_ranges = ARRAY_SIZE(aio_ctl_wr_ranges), +}; +static const struct regmap_access_table aio_ctl_rd_table = { + .yes_ranges = aio_ctl_rd_ranges, + .n_yes_ranges = ARRAY_SIZE(aio_ctl_rd_ranges), +}; +static const struct regmap_access_table aio_ctl_volatile_table = { + .yes_ranges = aio_ctl_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(aio_ctl_volatile_ranges), +}; + +static const struct regmap_config aio_ctl_regmap_config = { + .name = "aio_ctl", + .reg_bits = 8, + .reg_stride = 1, + .reg_base = STX104_AIO_BASE, + .val_bits = 8, + .io_port = true, + .wr_table = &aio_ctl_wr_table, + .rd_table = &aio_ctl_rd_table, + .volatile_table = &aio_ctl_volatile_table, + .cache_type = REGCACHE_FLAT, +}; + +static const struct regmap_range aio_data_wr_ranges[] = { + regmap_reg_range(0x4, 0x6), +}; +static const struct regmap_range aio_data_rd_ranges[] = { + regmap_reg_range(0x0, 0x0), +}; +static const struct regmap_access_table aio_data_wr_table = { + .yes_ranges = aio_data_wr_ranges, + .n_yes_ranges = ARRAY_SIZE(aio_data_wr_ranges), +}; +static const struct regmap_access_table aio_data_rd_table = { + .yes_ranges = aio_data_rd_ranges, + .n_yes_ranges = ARRAY_SIZE(aio_data_rd_ranges), +}; + +static const struct regmap_config aio_data_regmap_config = { + .name = "aio_data", + .reg_bits = 16, + .reg_stride = STX104_AIO_DATA_STRIDE, + .reg_base = STX104_AIO_BASE, + .val_bits = 16, + .io_port = true, + .wr_table = &aio_data_wr_table, + .rd_table = &aio_data_rd_table, + .volatile_table = &aio_data_rd_table, + .cache_type = REGCACHE_FLAT, +}; + +static const struct regmap_config dio_regmap_config = { + .name = "dio", + .reg_bits = 8, + .reg_stride = 1, + .reg_base = STX104_DIO_REG, + .val_bits = 8, + .io_port = true, }; static int stx104_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct stx104_iio *const priv = iio_priv(indio_dev); - struct stx104_reg __iomem *const reg = priv->reg; + int err; unsigned int adc_config; - int adbu; - int gain; + unsigned int value; + unsigned int adc_status; switch (mask) { case IIO_CHAN_INFO_HARDWAREGAIN: - /* get gain configuration */ - adc_config = ioread8(®->acfg); - gain = adc_config & 0x3; + err = regmap_read(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, &adc_config); + if (err) + return err; - *val = 1 << gain; + *val = BIT(u8_get_bits(adc_config, STX104_GAIN)); return IIO_VAL_INT; case IIO_CHAN_INFO_RAW: if (chan->output) { - *val = priv->chan_out_states[chan->channel]; + err = regmap_read(priv->aio_data_map, STX104_DAC_OFFSET(chan->channel), + &value); + if (err) + return err; + *val = value; return IIO_VAL_INT; } mutex_lock(&priv->lock); /* select ADC channel */ - iowrite8(chan->channel | (chan->channel << 4), ®->achan); + err = regmap_write(priv->aio_ctl_map, STX104_ADC_CHANNEL, + STX104_SINGLE_CHANNEL(chan->channel)); + if (err) { + mutex_unlock(&priv->lock); + return err; + } /* trigger ADC sample capture by writing to the 8-bit * Software Strobe Register and wait for completion */ - iowrite8(0, ®->ssr_ad); - while (ioread8(®->cir_asr) & BIT(7)); - - *val = ioread16(®->ssr_ad); + err = regmap_write(priv->aio_ctl_map, STX104_SOFTWARE_STROBE, 0); + if (err) { + mutex_unlock(&priv->lock); + return err; + } + do { + err = regmap_read(priv->aio_ctl_map, STX104_ADC_STATUS, &adc_status); + if (err) { + mutex_unlock(&priv->lock); + return err; + } + } while (u8_get_bits(adc_status, STX104_CNV)); + + err = regmap_read(priv->aio_data_map, STX104_ADC_DATA, &value); + if (err) { + mutex_unlock(&priv->lock); + return err; + } + *val = value; mutex_unlock(&priv->lock); return IIO_VAL_INT; case IIO_CHAN_INFO_OFFSET: /* get ADC bipolar/unipolar configuration */ - adc_config = ioread8(®->acfg); - adbu = !(adc_config & BIT(2)); + err = regmap_read(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, &adc_config); + if (err) + return err; - *val = -32768 * adbu; + *val = (u8_get_bits(adc_config, STX104_ADBU) == STX104_BIPOLAR) ? -32768 : 0; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: /* get ADC bipolar/unipolar and gain configuration */ - adc_config = ioread8(®->acfg); - adbu = !(adc_config & BIT(2)); - gain = adc_config & 0x3; + err = regmap_read(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, &adc_config); + if (err) + return err; *val = 5; - *val2 = 15 - adbu + gain; + *val2 = (u8_get_bits(adc_config, STX104_ADBU) == STX104_BIPOLAR) ? 14 : 15; + *val2 += u8_get_bits(adc_config, STX104_GAIN); return IIO_VAL_FRACTIONAL_LOG2; } @@ -158,28 +257,29 @@ static int stx104_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct stx104_iio *const priv = iio_priv(indio_dev); + u8 gain; switch (mask) { case IIO_CHAN_INFO_HARDWAREGAIN: /* Only four gain states (x1, x2, x4, x8) */ switch (val) { case 1: - iowrite8(0, &priv->reg->acfg); + gain = STX104_GAIN_X1; break; case 2: - iowrite8(1, &priv->reg->acfg); + gain = STX104_GAIN_X2; break; case 4: - iowrite8(2, &priv->reg->acfg); + gain = STX104_GAIN_X4; break; case 8: - iowrite8(3, &priv->reg->acfg); + gain = STX104_GAIN_X8; break; default: return -EINVAL; } - return 0; + return regmap_write(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, gain); case IIO_CHAN_INFO_RAW: if (!chan->output) return -EINVAL; @@ -187,13 +287,7 @@ static int stx104_write_raw(struct iio_dev *indio_dev, if (val < 0 || val > U16_MAX) return -EINVAL; - mutex_lock(&priv->lock); - - priv->chan_out_states[chan->channel] = val; - iowrite16(val, &priv->reg->dac[chan->channel]); - - mutex_unlock(&priv->lock); - return 0; + return regmap_write(priv->aio_data_map, STX104_DAC_OFFSET(chan->channel), val); } return -EINVAL; @@ -222,119 +316,66 @@ static const struct iio_chan_spec stx104_channels_diff[] = { STX104_IN_CHAN(6, 1), STX104_IN_CHAN(7, 1) }; -static int stx104_gpio_get_direction(struct gpio_chip *chip, - unsigned int offset) -{ - /* GPIO 0-3 are input only, while the rest are output only */ - if (offset < 4) - return 1; - - return 0; -} - -static int stx104_gpio_direction_input(struct gpio_chip *chip, - unsigned int offset) -{ - if (offset >= 4) - return -EINVAL; - - return 0; -} - -static int stx104_gpio_direction_output(struct gpio_chip *chip, - unsigned int offset, int value) +static int stx104_reg_mask_xlate(struct gpio_regmap *const gpio, const unsigned int base, + unsigned int offset, unsigned int *const reg, + unsigned int *const mask) { - if (offset < 4) - return -EINVAL; - - chip->set(chip, offset, value); - return 0; -} - -static int stx104_gpio_get(struct gpio_chip *chip, unsigned int offset) -{ - struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip); - + /* Output lines are located at same register bit offsets as input lines */ if (offset >= 4) - return -EINVAL; + offset -= 4; - return !!(ioread8(stx104gpio->base) & BIT(offset)); -} - -static int stx104_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, - unsigned long *bits) -{ - struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip); - - *bits = ioread8(stx104gpio->base); + *reg = base; + *mask = BIT(offset); return 0; } -static void stx104_gpio_set(struct gpio_chip *chip, unsigned int offset, - int value) -{ - struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip); - const unsigned int mask = BIT(offset) >> 4; - unsigned long flags; - - if (offset < 4) - return; - - spin_lock_irqsave(&stx104gpio->lock, flags); - - if (value) - stx104gpio->out_state |= mask; - else - stx104gpio->out_state &= ~mask; - - iowrite8(stx104gpio->out_state, stx104gpio->base); - - spin_unlock_irqrestore(&stx104gpio->lock, flags); -} - #define STX104_NGPIO 8 static const char *stx104_names[STX104_NGPIO] = { "DIN0", "DIN1", "DIN2", "DIN3", "DOUT0", "DOUT1", "DOUT2", "DOUT3" }; -static void stx104_gpio_set_multiple(struct gpio_chip *chip, - unsigned long *mask, unsigned long *bits) +static int stx104_init_hw(struct stx104_iio *const priv) { - struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip); - unsigned long flags; - - /* verify masked GPIO are output */ - if (!(*mask & 0xF0)) - return; + int err; - *mask >>= 4; - *bits >>= 4; + /* configure device for software trigger operation */ + err = regmap_write(priv->aio_ctl_map, STX104_ADC_CONTROL, STX104_SOFTWARE_TRIGGER); + if (err) + return err; - spin_lock_irqsave(&stx104gpio->lock, flags); + /* initialize gain setting to x1 */ + err = regmap_write(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, STX104_GAIN_X1); + if (err) + return err; - stx104gpio->out_state &= ~*mask; - stx104gpio->out_state |= *mask & *bits; - iowrite8(stx104gpio->out_state, stx104gpio->base); + /* initialize DAC outputs to 0V */ + err = regmap_write(priv->aio_data_map, STX104_DAC_BASE, 0); + if (err) + return err; + err = regmap_write(priv->aio_data_map, STX104_DAC_BASE + STX104_AIO_DATA_STRIDE, 0); + if (err) + return err; - spin_unlock_irqrestore(&stx104gpio->lock, flags); + return 0; } static int stx104_probe(struct device *dev, unsigned int id) { struct iio_dev *indio_dev; struct stx104_iio *priv; - struct stx104_gpio *stx104gpio; + struct gpio_regmap_config gpio_config; + void __iomem *stx104_base; + struct regmap *aio_ctl_map; + struct regmap *aio_data_map; + struct regmap *dio_map; int err; + unsigned int adc_status; indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); if (!indio_dev) return -ENOMEM; - stx104gpio = devm_kzalloc(dev, sizeof(*stx104gpio), GFP_KERNEL); - if (!stx104gpio) - return -ENOMEM; - if (!devm_request_region(dev, base[id], STX104_EXTENT, dev_name(dev))) { dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n", @@ -342,16 +383,37 @@ static int stx104_probe(struct device *dev, unsigned int id) return -EBUSY; } - priv = iio_priv(indio_dev); - priv->reg = devm_ioport_map(dev, base[id], STX104_EXTENT); - if (!priv->reg) + stx104_base = devm_ioport_map(dev, base[id], STX104_EXTENT); + if (!stx104_base) return -ENOMEM; + aio_ctl_map = devm_regmap_init_mmio(dev, stx104_base, &aio_ctl_regmap_config); + if (IS_ERR(aio_ctl_map)) + return dev_err_probe(dev, PTR_ERR(aio_ctl_map), + "Unable to initialize aio_ctl register map\n"); + + aio_data_map = devm_regmap_init_mmio(dev, stx104_base, &aio_data_regmap_config); + if (IS_ERR(aio_data_map)) + return dev_err_probe(dev, PTR_ERR(aio_data_map), + "Unable to initialize aio_data register map\n"); + + dio_map = devm_regmap_init_mmio(dev, stx104_base, &dio_regmap_config); + if (IS_ERR(dio_map)) + return dev_err_probe(dev, PTR_ERR(dio_map), + "Unable to initialize dio register map\n"); + + priv = iio_priv(indio_dev); + priv->aio_ctl_map = aio_ctl_map; + priv->aio_data_map = aio_data_map; + indio_dev->info = &stx104_info; indio_dev->modes = INDIO_DIRECT_MODE; - /* determine if differential inputs */ - if (ioread8(&priv->reg->cir_asr) & BIT(5)) { + err = regmap_read(aio_ctl_map, STX104_ADC_STATUS, &adc_status); + if (err) + return err; + + if (u8_get_bits(adc_status, STX104_SD) == STX104_DIFFERENTIAL) { indio_dev->num_channels = ARRAY_SIZE(stx104_channels_diff); indio_dev->channels = stx104_channels_diff; } else { @@ -363,41 +425,27 @@ static int stx104_probe(struct device *dev, unsigned int id) mutex_init(&priv->lock); - /* configure device for software trigger operation */ - iowrite8(0, &priv->reg->acr); + err = stx104_init_hw(priv); + if (err) + return err; - /* initialize gain setting to x1 */ - iowrite8(0, &priv->reg->acfg); - - /* initialize DAC output to 0V */ - iowrite16(0, &priv->reg->dac[0]); - iowrite16(0, &priv->reg->dac[1]); - - stx104gpio->chip.label = dev_name(dev); - stx104gpio->chip.parent = dev; - stx104gpio->chip.owner = THIS_MODULE; - stx104gpio->chip.base = -1; - stx104gpio->chip.ngpio = STX104_NGPIO; - stx104gpio->chip.names = stx104_names; - stx104gpio->chip.get_direction = stx104_gpio_get_direction; - stx104gpio->chip.direction_input = stx104_gpio_direction_input; - stx104gpio->chip.direction_output = stx104_gpio_direction_output; - stx104gpio->chip.get = stx104_gpio_get; - stx104gpio->chip.get_multiple = stx104_gpio_get_multiple; - stx104gpio->chip.set = stx104_gpio_set; - stx104gpio->chip.set_multiple = stx104_gpio_set_multiple; - stx104gpio->base = &priv->reg->dio; - stx104gpio->out_state = 0x0; - - spin_lock_init(&stx104gpio->lock); - - err = devm_gpiochip_add_data(dev, &stx104gpio->chip, stx104gpio); - if (err) { - dev_err(dev, "GPIO registering failed (%d)\n", err); + err = devm_iio_device_register(dev, indio_dev); + if (err) return err; - } - return devm_iio_device_register(dev, indio_dev); + gpio_config = (struct gpio_regmap_config) { + .parent = dev, + .regmap = dio_map, + .ngpio = STX104_NGPIO, + .names = stx104_names, + .reg_dat_base = GPIO_REGMAP_ADDR(STX104_DIO_REG), + .reg_set_base = GPIO_REGMAP_ADDR(STX104_DIO_REG), + .ngpio_per_reg = STX104_NGPIO, + .reg_mask_xlate = stx104_reg_mask_xlate, + .drvdata = dio_map, + }; + + return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config)); } static struct isa_driver stx104_driver = { |