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[79.54.25.3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42f86b1d826sm129591215e9.26.2024.10.08.08.45.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2024 08:45:28 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Tue, 08 Oct 2024 17:43:41 +0200 Subject: [PATCH v5 09/10] iio: dac: ad3552r: add high-speed platform driver Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241008-wip-bl-ad3552r-axi-v0-iio-testing-v5-9-3d410944a63d@baylibre.com> References: <20241008-wip-bl-ad3552r-axi-v0-iio-testing-v5-0-3d410944a63d@baylibre.com> In-Reply-To: <20241008-wip-bl-ad3552r-axi-v0-iio-testing-v5-0-3d410944a63d@baylibre.com> To: Lars-Peter Clausen , Michael Hennerich , Nuno Sa , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Olivier Moysan Cc: Jonathan Cameron , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, dletchner@baylibre.com, Mark Brown , Angelo Dureghello X-Mailer: b4 0.14.1 From: Angelo Dureghello Add High Speed ad3552r platform driver. The ad3552r DAC is controlled by a custom (fpga-based) DAC IP through the current AXI backend, or similar alternative IIO backend. Compared to the existing driver (ad3552r.c), that is a simple SPI driver, this driver is coupled with a DAC IIO backend that finally controls the ad3552r by a fpga-based "QSPI+DDR" interface, to reach maximum transfer rate of 33MUPS using dma stream capabilities. All commands involving QSPI bus read/write are delegated to the backend through the provided APIs for bus read/write. Signed-off-by: Angelo Dureghello --- drivers/iio/dac/Kconfig | 14 + drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ad3552r-hs.c | 526 +++++++++++++++++++++++++++++++ drivers/iio/dac/ad3552r.h | 7 + include/linux/platform_data/ad3552r-hs.h | 18 ++ 5 files changed, 566 insertions(+) diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index fa091995d002..fc11698e88f2 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -6,6 +6,20 @@ menu "Digital to analog converters" +config AD3552R_HS + tristate "Analog Devices AD3552R DAC High Speed driver" + select ADI_AXI_DAC + help + Say yes here to build support for Analog Devices AD3552R + Digital to Analog Converter High Speed driver. + + The driver requires the assistance of an IP core to operate, + since data is streamed into target device via DMA, sent over a + QSPI + DDR (Double Data Rate) bus. + + To compile this driver as a module, choose M here: the + module will be called ad3552r-hs. + config AD3552R tristate "Analog Devices AD3552R DAC driver" depends on SPI_MASTER diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index c92de0366238..d92e08ca93ca 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -4,6 +4,7 @@ # # When adding new entries keep the list in alphabetical order +obj-$(CONFIG_AD3552R_HS) += ad3552r-hs.o ad3552r-common.o obj-$(CONFIG_AD3552R) += ad3552r.o ad3552r-common.o obj-$(CONFIG_AD5360) += ad5360.o obj-$(CONFIG_AD5380) += ad5380.o diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c new file mode 100644 index 000000000000..4de33988721f --- /dev/null +++ b/drivers/iio/dac/ad3552r-hs.c @@ -0,0 +1,526 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices AD3552R + * Digital to Analog converter driver, High Speed version + * + * Copyright 2024 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ad3552r.h" + +struct ad3552r_hs_state { + const struct ad3552r_model_data *model_data; + struct gpio_desc *reset_gpio; + struct device *dev; + struct iio_backend *back; + bool single_channel; + struct ad3552r_hs_platform_data *data; + bool ddr_mode; +}; + +static int ad3552r_qspi_update_reg_bits(struct ad3552r_hs_state *st, + u32 reg, u32 mask, u32 val, + size_t xfer_size) +{ + u32 rval; + int err; + + err = st->data->bus_reg_read(st->back, reg, &rval, xfer_size); + if (err) + return err; + + rval &= ~mask; + rval |= val; + + return st->data->bus_reg_write(st->back, reg, rval, xfer_size); +} + +static int ad3552r_hs_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct ad3552r_hs_state *st = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: { + int sclk; + + ret = iio_backend_read_raw(st->back, chan, &sclk, 0, + IIO_CHAN_INFO_FREQUENCY); + if (ret != IIO_VAL_INT) + return -EINVAL; + + /* Using 4 lanes (QSPI) */ + *val = DIV_ROUND_CLOSEST(sclk * 4 * (1 + st->ddr_mode), + chan->scan_type.storagebits); + + return IIO_VAL_INT; + } + case IIO_CHAN_INFO_RAW: + ret = st->data->bus_reg_read(st->back, + AD3552R_REG_ADDR_CH_DAC_16B(chan->channel), + val, 2); + if (ret) + return ret; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int ad3552r_hs_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ad3552r_hs_state *st = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + iio_device_claim_direct_scoped(return -EBUSY, indio_dev) { + return st->data->bus_reg_write(st->back, + AD3552R_REG_ADDR_CH_DAC_16B(chan->channel), + val, 2); + } + unreachable(); + default: + return -EINVAL; + } +} + +static int ad3552r_hs_buffer_postenable(struct iio_dev *indio_dev) +{ + struct ad3552r_hs_state *st = iio_priv(indio_dev); + struct iio_backend_data_fmt fmt = { + .type = IIO_BACKEND_DATA_UNSIGNED + }; + int loop_len, val, err; + + /* Inform DAC chip to switch into DDR mode */ + err = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_D, + AD3552R_MASK_SPI_CONFIG_DDR, + AD3552R_MASK_SPI_CONFIG_DDR, 1); + if (err) + return err; + + /* Inform DAC IP to go for DDR mode from now on */ + err = iio_backend_ddr_enable(st->back); + if (err) { + dev_warn(st->dev, "could not set DDR mode, not streaming"); + goto exit_err; + } + + st->ddr_mode = true; + + switch (*indio_dev->active_scan_mask) { + case AD3552R_CH0_ACTIVE: + st->single_channel = true; + loop_len = 2; + val = AD3552R_REG_ADDR_CH_DAC_16B(0); + break; + case AD3552R_CH1_ACTIVE: + st->single_channel = true; + loop_len = 2; + val = AD3552R_REG_ADDR_CH_DAC_16B(1); + break; + case AD3552R_CH0_CH1_ACTIVE: + st->single_channel = false; + loop_len = 4; + val = AD3552R_REG_ADDR_CH_DAC_16B(1); + break; + default: + err = -EINVAL; + goto exit_err_ddr; + } + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_STREAM_MODE, + loop_len, 1); + if (err) + goto exit_err_ddr; + + err = iio_backend_data_transfer_addr(st->back, val); + if (err) + goto exit_err_ddr; + + err = iio_backend_data_format_set(st->back, 0, &fmt); + if (err) + goto exit_err_ddr; + + err = iio_backend_data_stream_enable(st->back); + if (err) + goto exit_err_ddr; + + return 0; + +exit_err_ddr: + iio_backend_ddr_disable(st->back); + +exit_err: + ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_D, + AD3552R_MASK_SPI_CONFIG_DDR, + 0, 1); + + iio_backend_ddr_disable(st->back); + + st->ddr_mode = false; + + return err; +} + +static int ad3552r_hs_buffer_predisable(struct iio_dev *indio_dev) +{ + struct ad3552r_hs_state *st = iio_priv(indio_dev); + int err; + + err = iio_backend_data_stream_disable(st->back); + if (err) + return err; + + /* Inform DAC to set in SDR mode */ + err = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_D, + AD3552R_MASK_SPI_CONFIG_DDR, + 0, 1); + if (err) + return err; + + err = iio_backend_ddr_disable(st->back); + if (err) + return err; + + st->ddr_mode = false; + + return 0; +} + +static int ad3552r_hs_set_output_range(struct ad3552r_hs_state *st, + unsigned int mode) +{ + return ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_CH0_CH1_OUTPUT_RANGE, + AD3552R_MASK_CH_OUTPUT_RANGE, + FIELD_PREP(AD3552R_MASK_CH0_RANGE, mode) | + FIELD_PREP(AD3552R_MASK_CH1_RANGE, mode), + 1); +} + +static int ad3552r_hs_reset(struct ad3552r_hs_state *st) +{ + int err; + + st->reset_gpio = devm_gpiod_get_optional(st->dev, + "reset", GPIOD_OUT_LOW); + if (IS_ERR(st->reset_gpio)) + return PTR_ERR(st->reset_gpio); + + if (st->reset_gpio) { + fsleep(10); + gpiod_set_value_cansleep(st->reset_gpio, 1); + } else { + err = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_A, + AD3552R_MASK_SOFTWARE_RESET, + AD3552R_MASK_SOFTWARE_RESET, 1); + if (err) + return err; + } + msleep(100); + + return 0; +} + +static int ad3552r_hs_scratch_pad_test(struct ad3552r_hs_state *st) +{ + int err, val; + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_SCRATCH_PAD, + AD3552R_SCRATCH_PAD_TEST_VAL1, 1); + if (err) + return err; + + err = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_SCRATCH_PAD, + &val, 1); + if (err) + return err; + + if (val != AD3552R_SCRATCH_PAD_TEST_VAL1) { + dev_err(st->dev, + "SCRATCH_PAD_TEST mismatch. Expected 0x%x, Read 0x%x\n", + AD3552R_SCRATCH_PAD_TEST_VAL1, val); + return -EIO; + } + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_SCRATCH_PAD, + AD3552R_SCRATCH_PAD_TEST_VAL2, 1); + if (err) + return err; + + err = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_SCRATCH_PAD, + &val, 1); + if (err) + return err; + + if (val != AD3552R_SCRATCH_PAD_TEST_VAL2) { + dev_err(st->dev, + "SCRATCH_PAD_TEST mismatch. Expected 0x%x, Read 0x%x\n", + AD3552R_SCRATCH_PAD_TEST_VAL2, val); + return -EIO; + } + + return 0; +} + +static int ad3552r_hs_setup_custom_gain(struct ad3552r_hs_state *st, + u16 gain, u16 offset) +{ + int err; + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_CH_OFFSET(0), + offset, 1); + if (err) + return dev_err_probe(st->dev, err, "Error writing register\n"); + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_CH_OFFSET(1), + offset, 1); + if (err) + return dev_err_probe(st->dev, err, "Error writing register\n"); + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_CH_GAIN(0), + gain, 1); + if (err) + return dev_err_probe(st->dev, err, "Error writing register\n"); + + err = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_CH_GAIN(1), + gain, 1); + if (err) + return dev_err_probe(st->dev, err, "Error writing register\n"); + + return 0; +} + +static int ad3552r_hs_setup(struct ad3552r_hs_state *st) +{ + u8 gs_p, gs_n; + s16 goffs; + u16 id, rfb; + u16 gain = 0, offset = 0; + u32 val, range; + int err; + + err = ad3552r_hs_reset(st); + if (err) + return err; + + err = iio_backend_ddr_disable(st->back); + if (err) + return err; + + err = ad3552r_hs_scratch_pad_test(st); + if (err) + return err; + + err = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_PRODUCT_ID_L, + &val, 1); + if (err) + return err; + + id = val; + + err = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_PRODUCT_ID_H, + &val, 1); + if (err) + return err; + + id |= val << 8; + if (id != st->model_data->chip_id) + dev_info(st->dev, "Chip ID error. Expected 0x%x, Read 0x%x\n", + AD3552R_ID, id); + + err = st->data->bus_reg_write(st->back, + AD3552R_REG_ADDR_SH_REFERENCE_CONFIG, + 0, 1); + if (err) + return err; + + err = st->data->bus_reg_write(st->back, + AD3552R_REG_ADDR_TRANSFER_REGISTER, + AD3552R_MASK_QUAD_SPI | + AD3552R_MASK_STREAM_LENGTH_KEEP_VALUE, 1); + if (err) + return err; + + err = iio_backend_data_source_set(st->back, 0, IIO_BACKEND_EXTERNAL); + if (err) + return err; + + err = iio_backend_data_source_set(st->back, 1, IIO_BACKEND_EXTERNAL); + if (err) + return err; + + err = ad3552r_get_ref_voltage(st->dev); + if (err < 0) + return err; + + val = err; + + err = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_SH_REFERENCE_CONFIG, + AD3552R_MASK_REFERENCE_VOLTAGE_SEL, + val, 1); + if (err) + return err; + + err = ad3552r_get_drive_strength(st->dev, &val); + if (!err) { + err = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_D, + AD3552R_MASK_SDO_DRIVE_STRENGTH, + val, 1); + if (err) + return err; + } + + struct fwnode_handle *child __free(fwnode_handle) = + device_get_named_child_node(st->dev, "channel"); + if (!child) + return -EINVAL; + + /* + * One of "adi,output-range-microvolt" or "custom-output-range-config" + * must be available in fdt. + */ + err = ad3552r_get_output_range(st->dev, st->model_data, child, &range); + if (!err) + return ad3552r_hs_set_output_range(st, range); + if (err != -ENOENT) + return err; + + err = ad3552r_get_custom_gain(st->dev, child, &gs_p, &gs_n, &rfb, + &goffs); + if (err) + return err; + + gain = ad3552r_calc_custom_gain(gs_p, gs_n, goffs); + offset = abs(goffs); + + return ad3552r_hs_setup_custom_gain(st, gain, offset); +} + +static const struct iio_buffer_setup_ops ad3552r_hs_buffer_setup_ops = { + .postenable = ad3552r_hs_buffer_postenable, + .predisable = ad3552r_hs_buffer_predisable, +}; + +#define AD3552R_CHANNEL(ch) { \ + .type = IIO_VOLTAGE, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .output = 1, \ + .indexed = 1, \ + .channel = (ch), \ + .scan_index = (ch), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_BE, \ + } \ +} + +static const struct iio_chan_spec ad3552r_hs_channels[] = { + AD3552R_CHANNEL(0), + AD3552R_CHANNEL(1), +}; + +static const struct iio_info ad3552r_hs_info = { + .read_raw = &ad3552r_hs_read_raw, + .write_raw = &ad3552r_hs_write_raw, +}; + +static int ad3552r_hs_probe(struct platform_device *pdev) +{ + struct ad3552r_hs_state *st; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + st->dev = &pdev->dev; + + st->data = pdev->dev.platform_data; + if (!st->data) + dev_err_probe(st->dev, -ENODEV, "No platform data !"); + + st->back = devm_iio_backend_get(&pdev->dev, NULL); + if (IS_ERR(st->back)) + return PTR_ERR(st->back); + + ret = devm_iio_backend_enable(&pdev->dev, st->back); + if (ret) + return ret; + + st->model_data = device_get_match_data(&pdev->dev); + + indio_dev->name = "ad3552r"; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->setup_ops = &ad3552r_hs_buffer_setup_ops; + indio_dev->channels = ad3552r_hs_channels; + indio_dev->num_channels = ARRAY_SIZE(ad3552r_hs_channels); + indio_dev->info = &ad3552r_hs_info; + + ret = devm_iio_backend_request_buffer(&pdev->dev, st->back, indio_dev); + if (ret) + return ret; + + ret = ad3552r_hs_setup(st); + if (ret) + return ret; + + return devm_iio_device_register(&pdev->dev, indio_dev); +} + +static const struct ad3552r_model_data ad3552r_model_data = { + .model_name = "ad3552r", + .chip_id = AD3552R_ID, + .num_hw_channels = 2, + .ranges_table = ad3552r_ch_ranges, + .num_ranges = ARRAY_SIZE(ad3552r_ch_ranges), +}; + +static const struct of_device_id ad3552r_hs_of_id[] = { + { .compatible = "adi,ad3552r", .data = &ad3552r_model_data }, + { } +}; +MODULE_DEVICE_TABLE(of, ad3552r_hs_of_id); + +static struct platform_driver axi_ad3552r_driver = { + .driver = { + .name = "ad3552r-axi", + .of_match_table = ad3552r_hs_of_id, + }, + .probe = ad3552r_hs_probe, +}; +module_platform_driver(axi_ad3552r_driver); + +MODULE_AUTHOR("Dragos Bogdan "); +MODULE_AUTHOR("Angelo Dureghello "); +MODULE_DESCRIPTION("AD3552R Driver - AXI IP version"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(IIO_AD3552R); diff --git a/drivers/iio/dac/ad3552r.h b/drivers/iio/dac/ad3552r.h index 088eb8ecfac6..fc00ed4c2565 100644 --- a/drivers/iio/dac/ad3552r.h +++ b/drivers/iio/dac/ad3552r.h @@ -38,6 +38,8 @@ #define AD3552R_REG_ADDR_TRANSFER_REGISTER 0x0F #define AD3552R_MASK_MULTI_IO_MODE GENMASK(7, 6) #define AD3552R_MASK_STREAM_LENGTH_KEEP_VALUE BIT(2) +#define AD3552R_MASK_DUAL_SPI BIT(6) +#define AD3552R_MASK_QUAD_SPI BIT(7) #define AD3552R_REG_ADDR_INTERFACE_CONFIG_C 0x10 #define AD3552R_MASK_CRC_ENABLE (GENMASK(7, 6) |\ GENMASK(1, 0)) @@ -129,6 +131,11 @@ #define AD3552R_GAIN_SCALE 1000 #define AD3552R_LDAC_PULSE_US 100 +#define AD3552R_CH0_ACTIVE BIT(0) +#define AD3552R_CH1_ACTIVE BIT(1) +#define AD3552R_CH0_CH1_ACTIVE (AD3552R_CH0_ACTIVE | \ + AD3552R_CH1_ACTIVE) + #define AD3552R_MAX_RANGES 5 #define AD3542R_MAX_RANGES 6 diff --git a/include/linux/platform_data/ad3552r-hs.h b/include/linux/platform_data/ad3552r-hs.h new file mode 100644 index 000000000000..4e3213a0c73b --- /dev/null +++ b/include/linux/platform_data/ad3552r-hs.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 2010-2024 Analog Devices Inc. + * Copyright (c) 2024 Baylibre, SAS + */ +#ifndef __LINUX_PLATFORM_DATA_AD3552R_HS_H__ +#define __LINUX_PLATFORM_DATA_AD3552R_HS_H__ + +#include + +struct ad3552r_hs_platform_data { + int (*bus_reg_read)(struct iio_backend *back, u32 reg, u32 *val, + size_t data_size); + int (*bus_reg_write)(struct iio_backend *back, u32 reg, u32 val, + size_t data_size); +}; + +#endif /* __LINUX_PLATFORM_DATA_AD3552R_HS_H__ */