The ADRF6780 is a silicon germanium (SiGe) design, wideband, microwave upconverter optimized for point to point microwave radio designs operating in the 5.9 GHz to 23.6 GHz frequency range. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADRF6780.pdf Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx> --- changes in v8: - condense lines that are very long - set ADC channel as input - add `dev_err_probe` - handle device powerdown via `devm_add_action_or_reset` drivers/iio/frequency/Kconfig | 12 + drivers/iio/frequency/Makefile | 1 + drivers/iio/frequency/adrf6780.c | 496 +++++++++++++++++++++++++++++++ 3 files changed, 509 insertions(+) create mode 100644 drivers/iio/frequency/adrf6780.c diff --git a/drivers/iio/frequency/Kconfig b/drivers/iio/frequency/Kconfig index 240b81502512..2c9e0559e8a4 100644 --- a/drivers/iio/frequency/Kconfig +++ b/drivers/iio/frequency/Kconfig @@ -49,5 +49,17 @@ config ADF4371 To compile this driver as a module, choose M here: the module will be called adf4371. + +config ADRF6780 + tristate "Analog Devices ADRF6780 Microwave Upconverter" + depends on SPI + depends on COMMON_CLK + help + Say yes here to build support for Analog Devices ADRF6780 + 5.9 GHz to 23.6 GHz, Wideband, Microwave Upconverter. + + To compile this driver as a module, choose M here: the + module will be called adrf6780. + endmenu endmenu diff --git a/drivers/iio/frequency/Makefile b/drivers/iio/frequency/Makefile index 518b1e50caef..ae3136c79202 100644 --- a/drivers/iio/frequency/Makefile +++ b/drivers/iio/frequency/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_AD9523) += ad9523.o obj-$(CONFIG_ADF4350) += adf4350.o obj-$(CONFIG_ADF4371) += adf4371.o +obj-$(CONFIG_ADRF6780) += adrf6780.o diff --git a/drivers/iio/frequency/adrf6780.c b/drivers/iio/frequency/adrf6780.c new file mode 100644 index 000000000000..4097b31bdf0b --- /dev/null +++ b/drivers/iio/frequency/adrf6780.c @@ -0,0 +1,496 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ADRF6780 driver + * + * Copyright 2021 Analog Devices Inc. + */ + +#include <linux/bitfield.h> +#include <linux/bits.h> +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/iio/iio.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/spi/spi.h> + +#include <asm/unaligned.h> + +/* ADRF6780 Register Map */ +#define ADRF6780_REG_CONTROL 0x00 +#define ADRF6780_REG_ALARM_READBACK 0x01 +#define ADRF6780_REG_ALARM_MASKS 0x02 +#define ADRF6780_REG_ENABLE 0x03 +#define ADRF6780_REG_LINEARIZE 0x04 +#define ADRF6780_REG_LO_PATH 0x05 +#define ADRF6780_REG_ADC_CONTROL 0x06 +#define ADRF6780_REG_ADC_OUTPUT 0x0C + +/* ADRF6780_REG_CONTROL Map */ +#define ADRF6780_PARITY_EN_MSK BIT(15) +#define ADRF6780_SOFT_RESET_MSK BIT(14) +#define ADRF6780_CHIP_ID_MSK GENMASK(11, 4) +#define ADRF6780_CHIP_ID 0xA +#define ADRF6780_CHIP_REVISION_MSK GENMASK(3, 0) + +/* ADRF6780_REG_ALARM_READBACK Map */ +#define ADRF6780_PARITY_ERROR_MSK BIT(15) +#define ADRF6780_TOO_FEW_ERRORS_MSK BIT(14) +#define ADRF6780_TOO_MANY_ERRORS_MSK BIT(13) +#define ADRF6780_ADDRESS_RANGE_ERROR_MSK BIT(12) + +/* ADRF6780_REG_ENABLE Map */ +#define ADRF6780_VGA_BUFFER_EN_MSK BIT(8) +#define ADRF6780_DETECTOR_EN_MSK BIT(7) +#define ADRF6780_LO_BUFFER_EN_MSK BIT(6) +#define ADRF6780_IF_MODE_EN_MSK BIT(5) +#define ADRF6780_IQ_MODE_EN_MSK BIT(4) +#define ADRF6780_LO_X2_EN_MSK BIT(3) +#define ADRF6780_LO_PPF_EN_MSK BIT(2) +#define ADRF6780_LO_EN_MSK BIT(1) +#define ADRF6780_UC_BIAS_EN_MSK BIT(0) + +/* ADRF6780_REG_LINEARIZE Map */ +#define ADRF6780_RDAC_LINEARIZE_MSK GENMASK(7, 0) + +/* ADRF6780_REG_LO_PATH Map */ +#define ADRF6780_LO_SIDEBAND_MSK BIT(10) +#define ADRF6780_Q_PATH_PHASE_ACCURACY_MSK GENMASK(7, 4) +#define ADRF6780_I_PATH_PHASE_ACCURACY_MSK GENMASK(3, 0) + +/* ADRF6780_REG_ADC_CONTROL Map */ +#define ADRF6780_VDET_OUTPUT_SELECT_MSK BIT(3) +#define ADRF6780_ADC_START_MSK BIT(2) +#define ADRF6780_ADC_EN_MSK BIT(1) +#define ADRF6780_ADC_CLOCK_EN_MSK BIT(0) + +/* ADRF6780_REG_ADC_OUTPUT Map */ +#define ADRF6780_ADC_STATUS_MSK BIT(8) +#define ADRF6780_ADC_VALUE_MSK GENMASK(7, 0) + +struct adrf6780_dev { + struct spi_device *spi; + struct clk *clkin; + /* Protect against concurrent accesses to the device */ + struct mutex lock; + bool vga_buff_en; + bool lo_buff_en; + bool if_mode_en; + bool iq_mode_en; + bool lo_x2_en; + bool lo_ppf_en; + bool lo_en; + bool uc_bias_en; + bool lo_sideband; + bool vdet_out_en; + u8 data[3] ____cacheline_aligned; +}; + +static int adrf6780_spi_read(struct adrf6780_dev *dev, unsigned int reg, + unsigned int *val) +{ + int ret; + struct spi_transfer t = {0}; + + dev->data[0] = 0x80 | (reg << 1); + dev->data[1] = 0x0; + dev->data[2] = 0x0; + + t.rx_buf = &dev->data[0]; + t.tx_buf = &dev->data[0]; + t.len = 3; + + ret = spi_sync_transfer(dev->spi, &t, 1); + if (ret) + return ret; + + *val = (get_unaligned_be24(&dev->data[0]) >> 1) & GENMASK(15, 0); + + return ret; +} + +static int adrf6780_spi_write(struct adrf6780_dev *dev, + unsigned int reg, + unsigned int val) +{ + put_unaligned_be24((val << 1) | (reg << 17), &dev->data[0]); + + return spi_write(dev->spi, &dev->data[0], 3); +} + +static int adrf6780_spi_update_bits(struct adrf6780_dev *dev, unsigned int reg, + unsigned int mask, unsigned int val) +{ + int ret; + unsigned int data, temp; + + ret = adrf6780_spi_read(dev, reg, &data); + if (ret) + return ret; + + temp = (data & ~mask) | (val & mask); + + return adrf6780_spi_write(dev, reg, temp); +} + +static int adrf6780_read_adc_raw(struct adrf6780_dev *dev, unsigned int *read_val) +{ + int ret; + + mutex_lock(&dev->lock); + + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_ADC_CONTROL, + ADRF6780_ADC_EN_MSK | + ADRF6780_ADC_CLOCK_EN_MSK | + ADRF6780_ADC_START_MSK, + FIELD_PREP(ADRF6780_ADC_EN_MSK, 1) | + FIELD_PREP(ADRF6780_ADC_CLOCK_EN_MSK, 1) | + FIELD_PREP(ADRF6780_ADC_START_MSK, 1)); + if (ret) + goto exit; + + /* Recommended delay for the ADC to be ready*/ + usleep_range(200, 250); + + ret = adrf6780_spi_read(dev, ADRF6780_REG_ADC_OUTPUT, read_val); + if (ret) + goto exit; + + if (!(*read_val & ADRF6780_ADC_STATUS_MSK)) { + ret = -EINVAL; + goto exit; + } + + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_ADC_CONTROL, + ADRF6780_ADC_START_MSK, + FIELD_PREP(ADRF6780_ADC_START_MSK, 0)); + if (ret) + goto exit; + + ret = adrf6780_spi_read(dev, ADRF6780_REG_ADC_OUTPUT, read_val); + +exit: + mutex_unlock(&dev->lock); + return ret; +} + +static int adrf6780_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long info) +{ + struct adrf6780_dev *dev = iio_priv(indio_dev); + unsigned int data; + int ret; + + switch (info) { + case IIO_CHAN_INFO_RAW: + ret = adrf6780_read_adc_raw(dev, &data); + if (ret) + return ret; + + *val = data & ADRF6780_ADC_VALUE_MSK; + + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + ret = adrf6780_spi_read(dev, ADRF6780_REG_LINEARIZE, &data); + if (ret) + return ret; + + *val = data & ADRF6780_RDAC_LINEARIZE_MSK; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_PHASE: + ret = adrf6780_spi_read(dev, ADRF6780_REG_LO_PATH, &data); + if (ret) + return ret; + + switch (chan->channel2) { + case IIO_MOD_I: + *val = data & ADRF6780_I_PATH_PHASE_ACCURACY_MSK; + + return IIO_VAL_INT; + case IIO_MOD_Q: + *val = FIELD_GET(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, data); + + return IIO_VAL_INT; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static int adrf6780_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long info) +{ + struct adrf6780_dev *dev = iio_priv(indio_dev); + int ret; + + switch (info) { + case IIO_CHAN_INFO_SCALE: + return adrf6780_spi_write(dev, ADRF6780_REG_LINEARIZE, val); + case IIO_CHAN_INFO_PHASE: + switch (chan->channel2) { + case IIO_MOD_I: + mutex_lock(&dev->lock); + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_LO_PATH, + ADRF6780_I_PATH_PHASE_ACCURACY_MSK, + FIELD_PREP(ADRF6780_I_PATH_PHASE_ACCURACY_MSK, val)); + mutex_unlock(&dev->lock); + + return ret; + case IIO_MOD_Q: + mutex_lock(&dev->lock); + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_LO_PATH, + ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, + FIELD_PREP(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, val)); + mutex_unlock(&dev->lock); + + return ret; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static int adrf6780_reg_access(struct iio_dev *indio_dev, + unsigned int reg, + unsigned int write_val, + unsigned int *read_val) +{ + struct adrf6780_dev *dev = iio_priv(indio_dev); + + if (read_val) + return adrf6780_spi_read(dev, reg, read_val); + else + return adrf6780_spi_write(dev, reg, write_val); +} + +static const struct iio_info adrf6780_info = { + .read_raw = adrf6780_read_raw, + .write_raw = adrf6780_write_raw, + .debugfs_reg_access = &adrf6780_reg_access, +}; + +#define ADRF6780_CHAN_ADC(_channel) { \ + .type = IIO_ALTVOLTAGE, \ + .output = 0, \ + .indexed = 1, \ + .channel = _channel, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \ +} + +#define ADRF6780_CHAN_RDAC(_channel) { \ + .type = IIO_ALTVOLTAGE, \ + .output = 1, \ + .indexed = 1, \ + .channel = _channel, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_SCALE) \ +} + +#define ADRF6780_CHAN_IQ_PHASE(_channel, rf_comp) { \ + .type = IIO_ALTVOLTAGE, \ + .modified = 1, \ + .output = 1, \ + .indexed = 1, \ + .channel2 = IIO_MOD_##rf_comp, \ + .channel = _channel, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_PHASE) \ +} + +static const struct iio_chan_spec adrf6780_channels[] = { + ADRF6780_CHAN_ADC(0), + ADRF6780_CHAN_RDAC(0), + ADRF6780_CHAN_IQ_PHASE(0, I), + ADRF6780_CHAN_IQ_PHASE(0, Q), +}; + +static int adrf6780_reset(struct adrf6780_dev *dev) +{ + int ret; + struct spi_device *spi = dev->spi; + + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_CONTROL, + ADRF6780_SOFT_RESET_MSK, + FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 1)); + if (ret) { + dev_err(&spi->dev, "ADRF6780 SPI software reset failed.\n"); + return ret; + } + + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_CONTROL, + ADRF6780_SOFT_RESET_MSK, + FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 0)); + if (ret) { + dev_err(&spi->dev, "ADRF6780 SPI software reset disable failed.\n"); + return ret; + } + + return 0; +} + +static int adrf6780_init(struct adrf6780_dev *dev) +{ + int ret; + unsigned int chip_id, enable_reg, enable_reg_msk; + struct spi_device *spi = dev->spi; + + /* Perform a software reset */ + ret = adrf6780_reset(dev); + if (ret) + return ret; + + ret = adrf6780_spi_read(dev, ADRF6780_REG_CONTROL, &chip_id); + if (ret) + return ret; + + chip_id = FIELD_GET(ADRF6780_CHIP_ID_MSK, chip_id); + if (chip_id != ADRF6780_CHIP_ID) { + dev_err(&spi->dev, "ADRF6780 Invalid Chip ID.\n"); + return -EINVAL; + } + + enable_reg_msk = ADRF6780_VGA_BUFFER_EN_MSK | + ADRF6780_DETECTOR_EN_MSK | + ADRF6780_LO_BUFFER_EN_MSK | + ADRF6780_IF_MODE_EN_MSK | + ADRF6780_IQ_MODE_EN_MSK | + ADRF6780_LO_X2_EN_MSK | + ADRF6780_LO_PPF_EN_MSK | + ADRF6780_LO_EN_MSK | + ADRF6780_UC_BIAS_EN_MSK; + + enable_reg = FIELD_PREP(ADRF6780_VGA_BUFFER_EN_MSK, dev->vga_buff_en) | + FIELD_PREP(ADRF6780_DETECTOR_EN_MSK, 1) | + FIELD_PREP(ADRF6780_LO_BUFFER_EN_MSK, dev->lo_buff_en) | + FIELD_PREP(ADRF6780_IF_MODE_EN_MSK, dev->if_mode_en) | + FIELD_PREP(ADRF6780_IQ_MODE_EN_MSK, dev->iq_mode_en) | + FIELD_PREP(ADRF6780_LO_X2_EN_MSK, dev->lo_x2_en) | + FIELD_PREP(ADRF6780_LO_PPF_EN_MSK, dev->lo_ppf_en) | + FIELD_PREP(ADRF6780_LO_EN_MSK, dev->lo_en) | + FIELD_PREP(ADRF6780_UC_BIAS_EN_MSK, dev->uc_bias_en); + + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_ENABLE, enable_reg_msk, enable_reg); + if (ret) + return ret; + + ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_LO_PATH, + ADRF6780_LO_SIDEBAND_MSK, + FIELD_PREP(ADRF6780_LO_SIDEBAND_MSK, + dev->lo_sideband)); + if (ret) + return ret; + + return adrf6780_spi_update_bits(dev, ADRF6780_REG_ADC_CONTROL, + ADRF6780_VDET_OUTPUT_SELECT_MSK, + FIELD_PREP(ADRF6780_VDET_OUTPUT_SELECT_MSK, + dev->vdet_out_en)); +} + +static void adrf6780_properties_parse(struct adrf6780_dev *dev) +{ + struct spi_device *spi = dev->spi; + + dev->vga_buff_en = device_property_read_bool(&spi->dev, "adi,vga-buff-en"); + dev->lo_buff_en = device_property_read_bool(&spi->dev, "adi,lo-buff-en"); + dev->if_mode_en = device_property_read_bool(&spi->dev, "adi,if-mode-en"); + dev->iq_mode_en = device_property_read_bool(&spi->dev, "adi,iq-mode-en"); + dev->lo_x2_en = device_property_read_bool(&spi->dev, "adi,lo-x2-en"); + dev->lo_ppf_en = device_property_read_bool(&spi->dev, "adi,lo-ppf-en"); + dev->lo_en = device_property_read_bool(&spi->dev, "adi,lo-en"); + dev->uc_bias_en = device_property_read_bool(&spi->dev, "adi,uc-bias-en"); + dev->lo_sideband = device_property_read_bool(&spi->dev, "adi,lo-sideband"); + dev->vdet_out_en = device_property_read_bool(&spi->dev, "adi,vdet-out-en"); +} + +static void adrf6780_clk_disable(void *data) +{ + clk_disable_unprepare(data); +} + +static void adrf6780_powerdown(void *data) +{ + /* Disable all components in the Enable Register */ + adrf6780_spi_write(data, ADRF6780_REG_ENABLE, 0x0); +} + +static int adrf6780_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct adrf6780_dev *dev; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*dev)); + if (!indio_dev) + return -ENOMEM; + + dev = iio_priv(indio_dev); + + indio_dev->info = &adrf6780_info; + indio_dev->name = "adrf6780"; + indio_dev->channels = adrf6780_channels; + indio_dev->num_channels = ARRAY_SIZE(adrf6780_channels); + + dev->spi = spi; + + adrf6780_properties_parse(dev); + + dev->clkin = devm_clk_get(&spi->dev, "lo_in"); + if (IS_ERR(dev->clkin)) + return dev_err_probe(&spi->dev, PTR_ERR(dev->clkin), + "failed to get the LO input clock\n"); + + ret = clk_prepare_enable(dev->clkin); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&spi->dev, adrf6780_clk_disable, dev->clkin); + if (ret) + return ret; + + mutex_init(&dev->lock); + + ret = adrf6780_init(dev); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&spi->dev, adrf6780_powerdown, dev); + if (ret) + return ret; + + return devm_iio_device_register(&spi->dev, indio_dev); +} + +static const struct spi_device_id adrf6780_id[] = { + { "adrf6780", 0 }, + {} +}; +MODULE_DEVICE_TABLE(spi, adrf6780_id); + +static const struct of_device_id adrf6780_of_match[] = { + { .compatible = "adi,adrf6780" }, + {} +}; +MODULE_DEVICE_TABLE(of, adrf6780_of_match); + +static struct spi_driver adrf6780_driver = { + .driver = { + .name = "adrf6780", + .of_match_table = adrf6780_of_match, + }, + .probe = adrf6780_probe, + .id_table = adrf6780_id, +}; +module_spi_driver(adrf6780_driver); + +MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx"); +MODULE_DESCRIPTION("Analog Devices ADRF6780"); +MODULE_LICENSE("GPL v2"); -- 2.33.1
