diff options
Diffstat (limited to 'drivers/iio/frequency')
| -rw-r--r-- | drivers/iio/frequency/Kconfig | 42 | ||||
| -rw-r--r-- | drivers/iio/frequency/Makefile | 7 | ||||
| -rw-r--r-- | drivers/iio/frequency/ad9523.c | 1083 | ||||
| -rw-r--r-- | drivers/iio/frequency/adf4350.c | 645 |
4 files changed, 1777 insertions, 0 deletions
diff --git a/drivers/iio/frequency/Kconfig b/drivers/iio/frequency/Kconfig new file mode 100644 index 000000000..dc5e0b728 --- /dev/null +++ b/drivers/iio/frequency/Kconfig @@ -0,0 +1,42 @@ +# +# Frequency +# Direct Digital Synthesis drivers (DDS) +# Clock Distribution device drivers +# Phase-Locked Loop (PLL) frequency synthesizers +# +# When adding new entries keep the list in alphabetical order + +menu "Frequency Synthesizers DDS/PLL" + +menu "Clock Generator/Distribution" + +config AD9523 + tristate "Analog Devices AD9523 Low Jitter Clock Generator" + depends on SPI + help + Say yes here to build support for Analog Devices AD9523 Low Jitter + Clock Generator. The driver provides direct access via sysfs. + + To compile this driver as a module, choose M here: the + module will be called ad9523. + +endmenu + +# +# Phase-Locked Loop (PLL) frequency synthesizers +# + +menu "Phase-Locked Loop (PLL) frequency synthesizers" + +config ADF4350 + tristate "Analog Devices ADF4350/ADF4351 Wideband Synthesizers" + depends on SPI + help + Say yes here to build support for Analog Devices ADF4350/ADF4351 + Wideband Synthesizers. The driver provides direct access via sysfs. + + To compile this driver as a module, choose M here: the + module will be called adf4350. + +endmenu +endmenu diff --git a/drivers/iio/frequency/Makefile b/drivers/iio/frequency/Makefile new file mode 100644 index 000000000..2bca03f3e --- /dev/null +++ b/drivers/iio/frequency/Makefile @@ -0,0 +1,7 @@ +# +# Makefile iio/frequency +# + +# When adding new entries keep the list in alphabetical order +obj-$(CONFIG_AD9523) += ad9523.o +obj-$(CONFIG_ADF4350) += adf4350.o diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c new file mode 100644 index 000000000..f4a508107 --- /dev/null +++ b/drivers/iio/frequency/ad9523.c @@ -0,0 +1,1083 @@ +/* + * AD9523 SPI Low Jitter Clock Generator + * + * Copyright 2012 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/gpio/consumer.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/delay.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/frequency/ad9523.h> + +#define AD9523_READ (1 << 15) +#define AD9523_WRITE (0 << 15) +#define AD9523_CNT(x) (((x) - 1) << 13) +#define AD9523_ADDR(x) ((x) & 0xFFF) + +#define AD9523_R1B (1 << 16) +#define AD9523_R2B (2 << 16) +#define AD9523_R3B (3 << 16) +#define AD9523_TRANSF_LEN(x) ((x) >> 16) + +#define AD9523_SERIAL_PORT_CONFIG (AD9523_R1B | 0x0) +#define AD9523_VERSION_REGISTER (AD9523_R1B | 0x2) +#define AD9523_PART_REGISTER (AD9523_R1B | 0x3) +#define AD9523_READBACK_CTRL (AD9523_R1B | 0x4) + +#define AD9523_EEPROM_CUSTOMER_VERSION_ID (AD9523_R2B | 0x6) + +#define AD9523_PLL1_REF_A_DIVIDER (AD9523_R2B | 0x11) +#define AD9523_PLL1_REF_B_DIVIDER (AD9523_R2B | 0x13) +#define AD9523_PLL1_REF_TEST_DIVIDER (AD9523_R1B | 0x14) +#define AD9523_PLL1_FEEDBACK_DIVIDER (AD9523_R2B | 0x17) +#define AD9523_PLL1_CHARGE_PUMP_CTRL (AD9523_R2B | 0x19) +#define AD9523_PLL1_INPUT_RECEIVERS_CTRL (AD9523_R1B | 0x1A) +#define AD9523_PLL1_REF_CTRL (AD9523_R1B | 0x1B) +#define AD9523_PLL1_MISC_CTRL (AD9523_R1B | 0x1C) +#define AD9523_PLL1_LOOP_FILTER_CTRL (AD9523_R1B | 0x1D) + +#define AD9523_PLL2_CHARGE_PUMP (AD9523_R1B | 0xF0) +#define AD9523_PLL2_FEEDBACK_DIVIDER_AB (AD9523_R1B | 0xF1) +#define AD9523_PLL2_CTRL (AD9523_R1B | 0xF2) +#define AD9523_PLL2_VCO_CTRL (AD9523_R1B | 0xF3) +#define AD9523_PLL2_VCO_DIVIDER (AD9523_R1B | 0xF4) +#define AD9523_PLL2_LOOP_FILTER_CTRL (AD9523_R2B | 0xF6) +#define AD9523_PLL2_R2_DIVIDER (AD9523_R1B | 0xF7) + +#define AD9523_CHANNEL_CLOCK_DIST(ch) (AD9523_R3B | (0x192 + 3 * ch)) + +#define AD9523_PLL1_OUTPUT_CTRL (AD9523_R1B | 0x1BA) +#define AD9523_PLL1_OUTPUT_CHANNEL_CTRL (AD9523_R1B | 0x1BB) + +#define AD9523_READBACK_0 (AD9523_R1B | 0x22C) +#define AD9523_READBACK_1 (AD9523_R1B | 0x22D) + +#define AD9523_STATUS_SIGNALS (AD9523_R3B | 0x232) +#define AD9523_POWER_DOWN_CTRL (AD9523_R1B | 0x233) +#define AD9523_IO_UPDATE (AD9523_R1B | 0x234) + +#define AD9523_EEPROM_DATA_XFER_STATUS (AD9523_R1B | 0xB00) +#define AD9523_EEPROM_ERROR_READBACK (AD9523_R1B | 0xB01) +#define AD9523_EEPROM_CTRL1 (AD9523_R1B | 0xB02) +#define AD9523_EEPROM_CTRL2 (AD9523_R1B | 0xB03) + +/* AD9523_SERIAL_PORT_CONFIG */ + +#define AD9523_SER_CONF_SDO_ACTIVE (1 << 7) +#define AD9523_SER_CONF_SOFT_RESET (1 << 5) + +/* AD9523_READBACK_CTRL */ +#define AD9523_READBACK_CTRL_READ_BUFFERED (1 << 0) + +/* AD9523_PLL1_CHARGE_PUMP_CTRL */ +#define AD9523_PLL1_CHARGE_PUMP_CURRENT_nA(x) (((x) / 500) & 0x7F) +#define AD9523_PLL1_CHARGE_PUMP_TRISTATE (1 << 7) +#define AD9523_PLL1_CHARGE_PUMP_MODE_NORMAL (3 << 8) +#define AD9523_PLL1_CHARGE_PUMP_MODE_PUMP_DOWN (2 << 8) +#define AD9523_PLL1_CHARGE_PUMP_MODE_PUMP_UP (1 << 8) +#define AD9523_PLL1_CHARGE_PUMP_MODE_TRISTATE (0 << 8) +#define AD9523_PLL1_BACKLASH_PW_MIN (0 << 10) +#define AD9523_PLL1_BACKLASH_PW_LOW (1 << 10) +#define AD9523_PLL1_BACKLASH_PW_HIGH (2 << 10) +#define AD9523_PLL1_BACKLASH_PW_MAX (3 << 10) + +/* AD9523_PLL1_INPUT_RECEIVERS_CTRL */ +#define AD9523_PLL1_REF_TEST_RCV_EN (1 << 7) +#define AD9523_PLL1_REFB_DIFF_RCV_EN (1 << 6) +#define AD9523_PLL1_REFA_DIFF_RCV_EN (1 << 5) +#define AD9523_PLL1_REFB_RCV_EN (1 << 4) +#define AD9523_PLL1_REFA_RCV_EN (1 << 3) +#define AD9523_PLL1_REFA_REFB_PWR_CTRL_EN (1 << 2) +#define AD9523_PLL1_OSC_IN_CMOS_NEG_INP_EN (1 << 1) +#define AD9523_PLL1_OSC_IN_DIFF_EN (1 << 0) + +/* AD9523_PLL1_REF_CTRL */ +#define AD9523_PLL1_BYPASS_REF_TEST_DIV_EN (1 << 7) +#define AD9523_PLL1_BYPASS_FEEDBACK_DIV_EN (1 << 6) +#define AD9523_PLL1_ZERO_DELAY_MODE_INT (1 << 5) +#define AD9523_PLL1_ZERO_DELAY_MODE_EXT (0 << 5) +#define AD9523_PLL1_OSC_IN_PLL_FEEDBACK_EN (1 << 4) +#define AD9523_PLL1_ZD_IN_CMOS_NEG_INP_EN (1 << 3) +#define AD9523_PLL1_ZD_IN_DIFF_EN (1 << 2) +#define AD9523_PLL1_REFB_CMOS_NEG_INP_EN (1 << 1) +#define AD9523_PLL1_REFA_CMOS_NEG_INP_EN (1 << 0) + +/* AD9523_PLL1_MISC_CTRL */ +#define AD9523_PLL1_REFB_INDEP_DIV_CTRL_EN (1 << 7) +#define AD9523_PLL1_OSC_CTRL_FAIL_VCC_BY2_EN (1 << 6) +#define AD9523_PLL1_REF_MODE(x) ((x) << 2) +#define AD9523_PLL1_BYPASS_REFB_DIV (1 << 1) +#define AD9523_PLL1_BYPASS_REFA_DIV (1 << 0) + +/* AD9523_PLL1_LOOP_FILTER_CTRL */ +#define AD9523_PLL1_LOOP_FILTER_RZERO(x) ((x) & 0xF) + +/* AD9523_PLL2_CHARGE_PUMP */ +#define AD9523_PLL2_CHARGE_PUMP_CURRENT_nA(x) ((x) / 3500) + +/* AD9523_PLL2_FEEDBACK_DIVIDER_AB */ +#define AD9523_PLL2_FB_NDIV_A_CNT(x) (((x) & 0x3) << 6) +#define AD9523_PLL2_FB_NDIV_B_CNT(x) (((x) & 0x3F) << 0) +#define AD9523_PLL2_FB_NDIV(a, b) (4 * (b) + (a)) + +/* AD9523_PLL2_CTRL */ +#define AD9523_PLL2_CHARGE_PUMP_MODE_NORMAL (3 << 0) +#define AD9523_PLL2_CHARGE_PUMP_MODE_PUMP_DOWN (2 << 0) +#define AD9523_PLL2_CHARGE_PUMP_MODE_PUMP_UP (1 << 0) +#define AD9523_PLL2_CHARGE_PUMP_MODE_TRISTATE (0 << 0) +#define AD9523_PLL2_BACKLASH_PW_MIN (0 << 2) +#define AD9523_PLL2_BACKLASH_PW_LOW (1 << 2) +#define AD9523_PLL2_BACKLASH_PW_HIGH (2 << 2) +#define AD9523_PLL2_BACKLASH_PW_MAX (3 << 1) +#define AD9523_PLL2_BACKLASH_CTRL_EN (1 << 4) +#define AD9523_PLL2_FREQ_DOUBLER_EN (1 << 5) +#define AD9523_PLL2_LOCK_DETECT_PWR_DOWN_EN (1 << 7) + +/* AD9523_PLL2_VCO_CTRL */ +#define AD9523_PLL2_VCO_CALIBRATE (1 << 1) +#define AD9523_PLL2_FORCE_VCO_MIDSCALE (1 << 2) +#define AD9523_PLL2_FORCE_REFERENCE_VALID (1 << 3) +#define AD9523_PLL2_FORCE_RELEASE_SYNC (1 << 4) + +/* AD9523_PLL2_VCO_DIVIDER */ +#define AD9523_PLL2_VCO_DIV_M1(x) ((((x) - 3) & 0x3) << 0) +#define AD9523_PLL2_VCO_DIV_M2(x) ((((x) - 3) & 0x3) << 4) +#define AD9523_PLL2_VCO_DIV_M1_PWR_DOWN_EN (1 << 2) +#define AD9523_PLL2_VCO_DIV_M2_PWR_DOWN_EN (1 << 6) + +/* AD9523_PLL2_LOOP_FILTER_CTRL */ +#define AD9523_PLL2_LOOP_FILTER_CPOLE1(x) (((x) & 0x7) << 0) +#define AD9523_PLL2_LOOP_FILTER_RZERO(x) (((x) & 0x7) << 3) +#define AD9523_PLL2_LOOP_FILTER_RPOLE2(x) (((x) & 0x7) << 6) +#define AD9523_PLL2_LOOP_FILTER_RZERO_BYPASS_EN (1 << 8) + +/* AD9523_PLL2_R2_DIVIDER */ +#define AD9523_PLL2_R2_DIVIDER_VAL(x) (((x) & 0x1F) << 0) + +/* AD9523_CHANNEL_CLOCK_DIST */ +#define AD9523_CLK_DIST_DIV_PHASE(x) (((x) & 0x3F) << 18) +#define AD9523_CLK_DIST_DIV_PHASE_REV(x) ((ret >> 18) & 0x3F) +#define AD9523_CLK_DIST_DIV(x) ((((x) - 1) & 0x3FF) << 8) +#define AD9523_CLK_DIST_DIV_REV(x) (((ret >> 8) & 0x3FF) + 1) +#define AD9523_CLK_DIST_INV_DIV_OUTPUT_EN (1 << 7) +#define AD9523_CLK_DIST_IGNORE_SYNC_EN (1 << 6) +#define AD9523_CLK_DIST_PWR_DOWN_EN (1 << 5) +#define AD9523_CLK_DIST_LOW_PWR_MODE_EN (1 << 4) +#define AD9523_CLK_DIST_DRIVER_MODE(x) (((x) & 0xF) << 0) + +/* AD9523_PLL1_OUTPUT_CTRL */ +#define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH6_M2 (1 << 7) +#define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH5_M2 (1 << 6) +#define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH4_M2 (1 << 5) +#define AD9523_PLL1_OUTP_CTRL_CMOS_DRV_WEAK (1 << 4) +#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_1 (0 << 0) +#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_2 (1 << 0) +#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_4 (2 << 0) +#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_8 (4 << 0) +#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_16 (8 << 0) + +/* AD9523_PLL1_OUTPUT_CHANNEL_CTRL */ +#define AD9523_PLL1_OUTP_CH_CTRL_OUTPUT_PWR_DOWN_EN (1 << 7) +#define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH9_M2 (1 << 6) +#define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH8_M2 (1 << 5) +#define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH7_M2 (1 << 4) +#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH3 (1 << 3) +#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH2 (1 << 2) +#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH1 (1 << 1) +#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH0 (1 << 0) + +/* AD9523_READBACK_0 */ +#define AD9523_READBACK_0_STAT_PLL2_REF_CLK (1 << 7) +#define AD9523_READBACK_0_STAT_PLL2_FB_CLK (1 << 6) +#define AD9523_READBACK_0_STAT_VCXO (1 << 5) +#define AD9523_READBACK_0_STAT_REF_TEST (1 << 4) +#define AD9523_READBACK_0_STAT_REFB (1 << 3) +#define AD9523_READBACK_0_STAT_REFA (1 << 2) +#define AD9523_READBACK_0_STAT_PLL2_LD (1 << 1) +#define AD9523_READBACK_0_STAT_PLL1_LD (1 << 0) + +/* AD9523_READBACK_1 */ +#define AD9523_READBACK_1_HOLDOVER_ACTIVE (1 << 3) +#define AD9523_READBACK_1_AUTOMODE_SEL_REFB (1 << 2) +#define AD9523_READBACK_1_VCO_CALIB_IN_PROGRESS (1 << 0) + +/* AD9523_STATUS_SIGNALS */ +#define AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL (1 << 16) +#define AD9523_STATUS_MONITOR_01_PLL12_LOCKED (0x302) +/* AD9523_POWER_DOWN_CTRL */ +#define AD9523_POWER_DOWN_CTRL_PLL1_PWR_DOWN (1 << 2) +#define AD9523_POWER_DOWN_CTRL_PLL2_PWR_DOWN (1 << 1) +#define AD9523_POWER_DOWN_CTRL_DIST_PWR_DOWN (1 << 0) + +/* AD9523_IO_UPDATE */ +#define AD9523_IO_UPDATE_EN (1 << 0) + +/* AD9523_EEPROM_DATA_XFER_STATUS */ +#define AD9523_EEPROM_DATA_XFER_IN_PROGRESS (1 << 0) + +/* AD9523_EEPROM_ERROR_READBACK */ +#define AD9523_EEPROM_ERROR_READBACK_FAIL (1 << 0) + +/* AD9523_EEPROM_CTRL1 */ +#define AD9523_EEPROM_CTRL1_SOFT_EEPROM (1 << 1) +#define AD9523_EEPROM_CTRL1_EEPROM_WRITE_PROT_DIS (1 << 0) + +/* AD9523_EEPROM_CTRL2 */ +#define AD9523_EEPROM_CTRL2_REG2EEPROM (1 << 0) + +#define AD9523_NUM_CHAN 14 +#define AD9523_NUM_CHAN_ALT_CLK_SRC 10 + +/* Helpers to avoid excess line breaks */ +#define AD_IFE(_pde, _a, _b) ((pdata->_pde) ? _a : _b) +#define AD_IF(_pde, _a) AD_IFE(_pde, _a, 0) + +enum { + AD9523_STAT_PLL1_LD, + AD9523_STAT_PLL2_LD, + AD9523_STAT_REFA, + AD9523_STAT_REFB, + AD9523_STAT_REF_TEST, + AD9523_STAT_VCXO, + AD9523_STAT_PLL2_FB_CLK, + AD9523_STAT_PLL2_REF_CLK, + AD9523_SYNC, + AD9523_EEPROM, +}; + +enum { + AD9523_VCO1, + AD9523_VCO2, + AD9523_VCXO, + AD9523_NUM_CLK_SRC, +}; + +struct ad9523_state { + struct spi_device *spi; + struct regulator *reg; + struct ad9523_platform_data *pdata; + struct iio_chan_spec ad9523_channels[AD9523_NUM_CHAN]; + struct gpio_desc *pwrdown_gpio; + struct gpio_desc *reset_gpio; + struct gpio_desc *sync_gpio; + + unsigned long vcxo_freq; + unsigned long vco_freq; + unsigned long vco_out_freq[AD9523_NUM_CLK_SRC]; + unsigned char vco_out_map[AD9523_NUM_CHAN_ALT_CLK_SRC]; + + /* + * Lock for accessing device registers. Some operations require + * multiple consecutive R/W operations, during which the device + * shouldn't be interrupted. The buffers are also shared across + * all operations so need to be protected on stand alone reads and + * writes. + */ + struct mutex lock; + + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + union { + __be32 d32; + u8 d8[4]; + } data[2] ____cacheline_aligned; +}; + +static int ad9523_read(struct iio_dev *indio_dev, unsigned int addr) +{ + struct ad9523_state *st = iio_priv(indio_dev); + int ret; + + /* We encode the register size 1..3 bytes into the register address. + * On transfer we get the size from the register datum, and make sure + * the result is properly aligned. + */ + + struct spi_transfer t[] = { + { + .tx_buf = &st->data[0].d8[2], + .len = 2, + }, { + .rx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)], + .len = AD9523_TRANSF_LEN(addr), + }, + }; + + st->data[0].d32 = cpu_to_be32(AD9523_READ | + AD9523_CNT(AD9523_TRANSF_LEN(addr)) | + AD9523_ADDR(addr)); + + ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t)); + if (ret < 0) + dev_err(&indio_dev->dev, "read failed (%d)", ret); + else + ret = be32_to_cpu(st->data[1].d32) & (0xFFFFFF >> + (8 * (3 - AD9523_TRANSF_LEN(addr)))); + + return ret; +}; + +static int ad9523_write(struct iio_dev *indio_dev, + unsigned int addr, unsigned int val) +{ + struct ad9523_state *st = iio_priv(indio_dev); + int ret; + struct spi_transfer t[] = { + { + .tx_buf = &st->data[0].d8[2], + .len = 2, + }, { + .tx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)], + .len = AD9523_TRANSF_LEN(addr), + }, + }; + + st->data[0].d32 = cpu_to_be32(AD9523_WRITE | + AD9523_CNT(AD9523_TRANSF_LEN(addr)) | + AD9523_ADDR(addr)); + st->data[1].d32 = cpu_to_be32(val); + + ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t)); + + if (ret < 0) + dev_err(&indio_dev->dev, "write failed (%d)", ret); + + return ret; +} + +static int ad9523_io_update(struct iio_dev *indio_dev) +{ + return ad9523_write(indio_dev, AD9523_IO_UPDATE, AD9523_IO_UPDATE_EN); +} + +static int ad9523_vco_out_map(struct iio_dev *indio_dev, + unsigned int ch, unsigned int out) +{ + struct ad9523_state *st = iio_priv(indio_dev); + int ret; + unsigned int mask; + + switch (ch) { + case 0 ... 3: + ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CHANNEL_CTRL); + if (ret < 0) + break; + mask = AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH0 << ch; + if (out) { + ret |= mask; + out = 2; + } else { + ret &= ~mask; + } + ret = ad9523_write(indio_dev, + AD9523_PLL1_OUTPUT_CHANNEL_CTRL, ret); + break; + case 4 ... 6: + ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CTRL); + if (ret < 0) + break; + mask = AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH4_M2 << (ch - 4); + if (out) + ret |= mask; + else + ret &= ~mask; + ret = ad9523_write(indio_dev, AD9523_PLL1_OUTPUT_CTRL, ret); + break; + case 7 ... 9: + ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CHANNEL_CTRL); + if (ret < 0) + break; + mask = AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH7_M2 << (ch - 7); + if (out) + ret |= mask; + else + ret &= ~mask; + ret = ad9523_write(indio_dev, + AD9523_PLL1_OUTPUT_CHANNEL_CTRL, ret); + break; + default: + return 0; + } + + st->vco_out_map[ch] = out; + + return ret; +} + +static int ad9523_set_clock_provider(struct iio_dev *indio_dev, + unsigned int ch, unsigned long freq) +{ + struct ad9523_state *st = iio_priv(indio_dev); + long tmp1, tmp2; + bool use_alt_clk_src; + + switch (ch) { + case 0 ... 3: + use_alt_clk_src = (freq == st->vco_out_freq[AD9523_VCXO]); + break; + case 4 ... 9: + tmp1 = st->vco_out_freq[AD9523_VCO1] / freq; + tmp2 = st->vco_out_freq[AD9523_VCO2] / freq; + tmp1 *= freq; + tmp2 *= freq; + use_alt_clk_src = (abs(tmp1 - freq) > abs(tmp2 - freq)); + break; + default: + /* Ch 10..14: No action required, return success */ + return 0; + } + + return ad9523_vco_out_map(indio_dev, ch, use_alt_clk_src); +} + +static int ad9523_store_eeprom(struct iio_dev *indio_dev) +{ + int ret, tmp; + + ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL1, + AD9523_EEPROM_CTRL1_EEPROM_WRITE_PROT_DIS); + if (ret < 0) + return ret; + ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL2, + AD9523_EEPROM_CTRL2_REG2EEPROM); + if (ret < 0) + return ret; + + tmp = 4; + do { + msleep(20); + ret = ad9523_read(indio_dev, + AD9523_EEPROM_DATA_XFER_STATUS); + if (ret < 0) + return ret; + } while ((ret & AD9523_EEPROM_DATA_XFER_IN_PROGRESS) && tmp--); + + ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL1, 0); + if (ret < 0) + return ret; + + ret = ad9523_read(indio_dev, AD9523_EEPROM_ERROR_READBACK); + if (ret < 0) + return ret; + + if (ret & AD9523_EEPROM_ERROR_READBACK_FAIL) { + dev_err(&indio_dev->dev, "Verify EEPROM failed"); + ret = -EIO; + } + + return ret; +} + +static int ad9523_sync(struct iio_dev *indio_dev) +{ + int ret, tmp; + + ret = ad9523_read(indio_dev, AD9523_STATUS_SIGNALS); + if (ret < 0) + return ret; + + tmp = ret; + tmp |= AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL; + + ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, tmp); + if (ret < 0) + return ret; + + ad9523_io_update(indio_dev); + tmp &= ~AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL; + + ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, tmp); + if (ret < 0) + return ret; + + return ad9523_io_update(indio_dev); +} + +static ssize_t ad9523_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + struct ad9523_state *st = iio_priv(indio_dev); + bool state; + int ret; + + ret = strtobool(buf, &state); + if (ret < 0) + return ret; + + if (!state) + return len; + + mutex_lock(&st->lock); + switch ((u32)this_attr->address) { + case AD9523_SYNC: + ret = ad9523_sync(indio_dev); + break; + case AD9523_EEPROM: + ret = ad9523_store_eeprom(indio_dev); + break; + default: + ret = -ENODEV; + } + mutex_unlock(&st->lock); + + return ret ? ret : len; +} + +static ssize_t ad9523_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + struct ad9523_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->lock); + ret = ad9523_read(indio_dev, AD9523_READBACK_0); + if (ret >= 0) { + ret = sprintf(buf, "%d\n", !!(ret & (1 << + (u32)this_attr->address))); + } + mutex_unlock(&st->lock); + + return ret; +} + +static IIO_DEVICE_ATTR(pll1_locked, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_PLL1_LD); + +static IIO_DEVICE_ATTR(pll2_locked, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_PLL2_LD); + +static IIO_DEVICE_ATTR(pll1_reference_clk_a_present, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_REFA); + +static IIO_DEVICE_ATTR(pll1_reference_clk_b_present, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_REFB); + +static IIO_DEVICE_ATTR(pll1_reference_clk_test_present, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_REF_TEST); + +static IIO_DEVICE_ATTR(vcxo_clk_present, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_VCXO); + +static IIO_DEVICE_ATTR(pll2_feedback_clk_present, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_PLL2_FB_CLK); + +static IIO_DEVICE_ATTR(pll2_reference_clk_present, S_IRUGO, + ad9523_show, + NULL, + AD9523_STAT_PLL2_REF_CLK); + +static IIO_DEVICE_ATTR(sync_dividers, S_IWUSR, + NULL, + ad9523_store, + AD9523_SYNC); + +static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, + NULL, + ad9523_store, + AD9523_EEPROM); + +static struct attribute *ad9523_attributes[] = { + &iio_dev_attr_sync_dividers.dev_attr.attr, + &iio_dev_attr_store_eeprom.dev_attr.attr, + &iio_dev_attr_pll2_feedback_clk_present.dev_attr.attr, + &iio_dev_attr_pll2_reference_clk_present.dev_attr.attr, + &iio_dev_attr_pll1_reference_clk_a_present.dev_attr.attr, + &iio_dev_attr_pll1_reference_clk_b_present.dev_attr.attr, + &iio_dev_attr_pll1_reference_clk_test_present.dev_attr.attr, + &iio_dev_attr_vcxo_clk_present.dev_attr.attr, + &iio_dev_attr_pll1_locked.dev_attr.attr, + &iio_dev_attr_pll2_locked.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad9523_attribute_group = { + .attrs = ad9523_attributes, +}; + +static int ad9523_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad9523_state *st = iio_priv(indio_dev); + unsigned int code; + int ret; + + mutex_lock(&st->lock); + ret = ad9523_read(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel)); + mutex_unlock(&st->lock); + + if (ret < 0) + return ret; + + switch (m) { + case IIO_CHAN_INFO_RAW: + *val = !(ret & AD9523_CLK_DIST_PWR_DOWN_EN); + return IIO_VAL_INT; + case IIO_CHAN_INFO_FREQUENCY: + *val = st->vco_out_freq[st->vco_out_map[chan->channel]] / + AD9523_CLK_DIST_DIV_REV(ret); + return IIO_VAL_INT; + case IIO_CHAN_INFO_PHASE: + code = (AD9523_CLK_DIST_DIV_PHASE_REV(ret) * 3141592) / + AD9523_CLK_DIST_DIV_REV(ret); + *val = code / 1000000; + *val2 = code % 1000000; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +}; + +static int ad9523_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad9523_state *st = iio_priv(indio_dev); + unsigned int reg; + int ret, tmp, code; + + mutex_lock(&st->lock); + ret = ad9523_read(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel)); + if (ret < 0) + goto out; + + reg = ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (val) + reg &= ~AD9523_CLK_DIST_PWR_DOWN_EN; + else + reg |= AD9523_CLK_DIST_PWR_DOWN_EN; + break; + case IIO_CHAN_INFO_FREQUENCY: + if (val <= 0) { + ret = -EINVAL; + goto out; + } + ret = ad9523_set_clock_provider(indio_dev, chan->channel, val); + if (ret < 0) + goto out; + tmp = st->vco_out_freq[st->vco_out_map[chan->channel]] / val; + tmp = clamp(tmp, 1, 1024); + reg &= ~(0x3FF << 8); + reg |= AD9523_CLK_DIST_DIV(tmp); + break; + case IIO_CHAN_INFO_PHASE: + code = val * 1000000 + val2 % 1000000; + tmp = (code * AD9523_CLK_DIST_DIV_REV(ret)) / 3141592; + tmp = clamp(tmp, 0, 63); + reg &= ~AD9523_CLK_DIST_DIV_PHASE(~0); + reg |= AD9523_CLK_DIST_DIV_PHASE(tmp); + break; + default: + ret = -EINVAL; + goto out; + } + + ret = ad9523_write(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel), + reg); + if (ret < 0) + goto out; + + ad9523_io_update(indio_dev); +out: + mutex_unlock(&st->lock); + return ret; +} + +static int ad9523_reg_access(struct iio_dev *indio_dev, + unsigned int reg, unsigned int writeval, + unsigned int *readval) +{ + struct ad9523_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->lock); + if (readval == NULL) { + ret = ad9523_write(indio_dev, reg | AD9523_R1B, writeval); + ad9523_io_update(indio_dev); + } else { + ret = ad9523_read(indio_dev, reg | AD9523_R1B); + if (ret < 0) + goto out_unlock; + *readval = ret; + ret = 0; + } + +out_unlock: + mutex_unlock(&st->lock); + + return ret; +} + +static const struct iio_info ad9523_info = { + .read_raw = &ad9523_read_raw, + .write_raw = &ad9523_write_raw, + .debugfs_reg_access = &ad9523_reg_access, + .attrs = &ad9523_attribute_group, +}; + +static int ad9523_setup(struct iio_dev *indio_dev) +{ + struct ad9523_state *st = iio_priv(indio_dev); + struct ad9523_platform_data *pdata = st->pdata; + struct ad9523_channel_spec *chan; + unsigned long active_mask = 0; + int ret, i; + + ret = ad9523_write(indio_dev, AD9523_SERIAL_PORT_CONFIG, + AD9523_SER_CONF_SOFT_RESET | + (st->spi->mode & SPI_3WIRE ? 0 : + AD9523_SER_CONF_SDO_ACTIVE)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_READBACK_CTRL, + AD9523_READBACK_CTRL_READ_BUFFERED); + if (ret < 0) + return ret; + + ret = ad9523_io_update(indio_dev); + if (ret < 0) + return ret; + + /* + * PLL1 Setup + */ + ret = ad9523_write(indio_dev, AD9523_PLL1_REF_A_DIVIDER, + pdata->refa_r_div); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_REF_B_DIVIDER, + pdata->refb_r_div); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_FEEDBACK_DIVIDER, + pdata->pll1_feedback_div); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_CHARGE_PUMP_CTRL, + AD9523_PLL1_CHARGE_PUMP_CURRENT_nA(pdata-> + pll1_charge_pump_current_nA) | + AD9523_PLL1_CHARGE_PUMP_MODE_NORMAL | + AD9523_PLL1_BACKLASH_PW_MIN); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_INPUT_RECEIVERS_CTRL, + AD_IF(refa_diff_rcv_en, AD9523_PLL1_REFA_RCV_EN) | + AD_IF(refb_diff_rcv_en, AD9523_PLL1_REFB_RCV_EN) | + AD_IF(osc_in_diff_en, AD9523_PLL1_OSC_IN_DIFF_EN) | + AD_IF(osc_in_cmos_neg_inp_en, + AD9523_PLL1_OSC_IN_CMOS_NEG_INP_EN) | + AD_IF(refa_diff_rcv_en, AD9523_PLL1_REFA_DIFF_RCV_EN) | + AD_IF(refb_diff_rcv_en, AD9523_PLL1_REFB_DIFF_RCV_EN)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_REF_CTRL, + AD_IF(zd_in_diff_en, AD9523_PLL1_ZD_IN_DIFF_EN) | + AD_IF(zd_in_cmos_neg_inp_en, + AD9523_PLL1_ZD_IN_CMOS_NEG_INP_EN) | + AD_IF(zero_delay_mode_internal_en, + AD9523_PLL1_ZERO_DELAY_MODE_INT) | + AD_IF(osc_in_feedback_en, AD9523_PLL1_OSC_IN_PLL_FEEDBACK_EN) | + AD_IF(refa_cmos_neg_inp_en, AD9523_PLL1_REFA_CMOS_NEG_INP_EN) | + AD_IF(refb_cmos_neg_inp_en, AD9523_PLL1_REFB_CMOS_NEG_INP_EN)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_MISC_CTRL, + AD9523_PLL1_REFB_INDEP_DIV_CTRL_EN | + AD9523_PLL1_REF_MODE(pdata->ref_mode)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL1_LOOP_FILTER_CTRL, + AD9523_PLL1_LOOP_FILTER_RZERO(pdata->pll1_loop_filter_rzero)); + if (ret < 0) + return ret; + /* + * PLL2 Setup + */ + + ret = ad9523_write(indio_dev, AD9523_PLL2_CHARGE_PUMP, + AD9523_PLL2_CHARGE_PUMP_CURRENT_nA(pdata-> + pll2_charge_pump_current_nA)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL2_FEEDBACK_DIVIDER_AB, + AD9523_PLL2_FB_NDIV_A_CNT(pdata->pll2_ndiv_a_cnt) | + AD9523_PLL2_FB_NDIV_B_CNT(pdata->pll2_ndiv_b_cnt)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL2_CTRL, + AD9523_PLL2_CHARGE_PUMP_MODE_NORMAL | + AD9523_PLL2_BACKLASH_CTRL_EN | + AD_IF(pll2_freq_doubler_en, AD9523_PLL2_FREQ_DOUBLER_EN)); + if (ret < 0) + return ret; + + st->vco_freq = (pdata->vcxo_freq * (pdata->pll2_freq_doubler_en ? 2 : 1) + / pdata->pll2_r2_div) * AD9523_PLL2_FB_NDIV(pdata-> + pll2_ndiv_a_cnt, pdata->pll2_ndiv_b_cnt); + + ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_CTRL, + AD9523_PLL2_VCO_CALIBRATE); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_DIVIDER, + AD9523_PLL2_VCO_DIV_M1(pdata->pll2_vco_diff_m1) | + AD9523_PLL2_VCO_DIV_M2(pdata->pll2_vco_diff_m2) | + AD_IFE(pll2_vco_diff_m1, 0, + AD9523_PLL2_VCO_DIV_M1_PWR_DOWN_EN) | + AD_IFE(pll2_vco_diff_m2, 0, + AD9523_PLL2_VCO_DIV_M2_PWR_DOWN_EN)); + if (ret < 0) + return ret; + + if (pdata->pll2_vco_diff_m1) + st->vco_out_freq[AD9523_VCO1] = + st->vco_freq / pdata->pll2_vco_diff_m1; + + if (pdata->pll2_vco_diff_m2) + st->vco_out_freq[AD9523_VCO2] = + st->vco_freq / pdata->pll2_vco_diff_m2; + + st->vco_out_freq[AD9523_VCXO] = pdata->vcxo_freq; + + ret = ad9523_write(indio_dev, AD9523_PLL2_R2_DIVIDER, + AD9523_PLL2_R2_DIVIDER_VAL(pdata->pll2_r2_div)); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_PLL2_LOOP_FILTER_CTRL, + AD9523_PLL2_LOOP_FILTER_CPOLE1(pdata->cpole1) | + AD9523_PLL2_LOOP_FILTER_RZERO(pdata->rzero) | + AD9523_PLL2_LOOP_FILTER_RPOLE2(pdata->rpole2) | + AD_IF(rzero_bypass_en, + AD9523_PLL2_LOOP_FILTER_RZERO_BYPASS_EN)); + if (ret < 0) + return ret; + + for (i = 0; i < pdata->num_channels; i++) { + chan = &pdata->channels[i]; + if (chan->channel_num < AD9523_NUM_CHAN) { + __set_bit(chan->channel_num, &active_mask); + ret = ad9523_write(indio_dev, + AD9523_CHANNEL_CLOCK_DIST(chan->channel_num), + AD9523_CLK_DIST_DRIVER_MODE(chan->driver_mode) | + AD9523_CLK_DIST_DIV(chan->channel_divider) | + AD9523_CLK_DIST_DIV_PHASE(chan->divider_phase) | + (chan->sync_ignore_en ? + AD9523_CLK_DIST_IGNORE_SYNC_EN : 0) | + (chan->divider_output_invert_en ? + AD9523_CLK_DIST_INV_DIV_OUTPUT_EN : 0) | + (chan->low_power_mode_en ? + AD9523_CLK_DIST_LOW_PWR_MODE_EN : 0) | + (chan->output_dis ? + AD9523_CLK_DIST_PWR_DOWN_EN : 0)); + if (ret < 0) + return ret; + + ret = ad9523_vco_out_map(indio_dev, chan->channel_num, + chan->use_alt_clock_src); + if (ret < 0) + return ret; + + st->ad9523_channels[i].type = IIO_ALTVOLTAGE; + st->ad9523_channels[i].output = 1; + st->ad9523_channels[i].indexed = 1; + st->ad9523_channels[i].channel = chan->channel_num; + st->ad9523_channels[i].extend_name = + chan->extended_name; + st->ad9523_channels[i].info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PHASE) | + BIT(IIO_CHAN_INFO_FREQUENCY); + } + } + + for_each_clear_bit(i, &active_mask, AD9523_NUM_CHAN) + ad9523_write(indio_dev, + AD9523_CHANNEL_CLOCK_DIST(i), + AD9523_CLK_DIST_DRIVER_MODE(TRISTATE) | + AD9523_CLK_DIST_PWR_DOWN_EN); + + ret = ad9523_write(indio_dev, AD9523_POWER_DOWN_CTRL, 0); + if (ret < 0) + return ret; + + ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, + AD9523_STATUS_MONITOR_01_PLL12_LOCKED); + if (ret < 0) + return ret; + + ret = ad9523_io_update(indio_dev); + if (ret < 0) + return ret; + + return 0; +} + +static int ad9523_probe(struct spi_device *spi) +{ + struct ad9523_platform_data *pdata = spi->dev.platform_data; + struct iio_dev *indio_dev; + struct ad9523_state *st; + int ret; + + if (!pdata) { + dev_err(&spi->dev, "no platform data?\n"); + return -EINVAL; + } + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (indio_dev == NULL) + return -ENOMEM; + + st = iio_priv(indio_dev); + + mutex_init(&st->lock); + + st->reg = devm_regulator_get(&spi->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + return ret; + } + + st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(st->pwrdown_gpio)) { + ret = PTR_ERR(st->pwrdown_gpio); + goto error_disable_reg; + } + + st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(st->reset_gpio)) { + ret = PTR_ERR(st->reset_gpio); + goto error_disable_reg; + } + + if (st->reset_gpio) { + udelay(1); + gpiod_direction_output(st->reset_gpio, 1); + } + + st->sync_gpio = devm_gpiod_get_optional(&spi->dev, "sync", + GPIOD_OUT_HIGH); + if (IS_ERR(st->sync_gpio)) { + ret = PTR_ERR(st->sync_gpio); + goto error_disable_reg; + } + + spi_set_drvdata(spi, indio_dev); + st->spi = spi; + st->pdata = pdata; + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = (pdata->name[0] != 0) ? pdata->name : + spi_get_device_id(spi)->name; + indio_dev->info = &ad9523_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = st->ad9523_channels; + indio_dev->num_channels = pdata->num_channels; + + ret = ad9523_setup(indio_dev); + if (ret < 0) + goto error_disable_reg; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_disable_reg; + + dev_info(&spi->dev, "probed %s\n", indio_dev->name); + + return 0; + +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); + + return ret; +} + +static int ad9523_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad9523_state *st = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); + + return 0; +} + +static const struct spi_device_id ad9523_id[] = { + {"ad9523-1", 9523}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad9523_id); + +static struct spi_driver ad9523_driver = { + .driver = { + .name = "ad9523", + }, + .probe = ad9523_probe, + .remove = ad9523_remove, + .id_table = ad9523_id, +}; +module_spi_driver(ad9523_driver); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD9523 CLOCKDIST/PLL"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c new file mode 100644 index 000000000..6d768431d --- /dev/null +++ b/drivers/iio/frequency/adf4350.c @@ -0,0 +1,645 @@ +/* + * ADF4350/ADF4351 SPI Wideband Synthesizer driver + * + * Copyright 2012-2013 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/gcd.h> +#include <linux/gpio.h> +#include <asm/div64.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/of_gpio.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/frequency/adf4350.h> + +enum { + ADF4350_FREQ, + ADF4350_FREQ_REFIN, + ADF4350_FREQ_RESOLUTION, + ADF4350_PWRDOWN, +}; + +struct adf4350_state { + struct spi_device *spi; + struct regulator *reg; + struct adf4350_platform_data *pdata; + struct clk *clk; + unsigned long clkin; + unsigned long chspc; /* Channel Spacing */ + unsigned long fpfd; /* Phase Frequency Detector */ + unsigned long min_out_freq; + unsigned r0_fract; + unsigned r0_int; + unsigned r1_mod; + unsigned r4_rf_div_sel; + unsigned long regs[6]; + unsigned long regs_hw[6]; + unsigned long long freq_req; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + __be32 val ____cacheline_aligned; +}; + +static struct adf4350_platform_data default_pdata = { + .channel_spacing = 10000, + .r2_user_settings = ADF4350_REG2_PD_POLARITY_POS | + ADF4350_REG2_CHARGE_PUMP_CURR_uA(2500), + .r3_user_settings = ADF4350_REG3_12BIT_CLKDIV_MODE(0), + .r4_user_settings = ADF4350_REG4_OUTPUT_PWR(3) | + ADF4350_REG4_MUTE_TILL_LOCK_EN, + .gpio_lock_detect = -1, +}; + +static int adf4350_sync_config(struct adf4350_state *st) +{ + int ret, i, doublebuf = 0; + + for (i = ADF4350_REG5; i >= ADF4350_REG0; i--) { + if ((st->regs_hw[i] != st->regs[i]) || + ((i == ADF4350_REG0) && doublebuf)) { + switch (i) { + case ADF4350_REG1: + case ADF4350_REG4: + doublebuf = 1; + break; + } + + st->val = cpu_to_be32(st->regs[i] | i); + ret = spi_write(st->spi, &st->val, 4); + if (ret < 0) + return ret; + st->regs_hw[i] = st->regs[i]; + dev_dbg(&st->spi->dev, "[%d] 0x%X\n", + i, (u32)st->regs[i] | i); + } + } + return 0; +} + +static int adf4350_reg_access(struct iio_dev *indio_dev, + unsigned reg, unsigned writeval, + unsigned *readval) +{ + struct adf4350_state *st = iio_priv(indio_dev); + int ret; + + if (reg > ADF4350_REG5) + return -EINVAL; + + mutex_lock(&indio_dev->mlock); + if (readval == NULL) { + st->regs[reg] = writeval & ~(BIT(0) | BIT(1) | BIT(2)); + ret = adf4350_sync_config(st); + } else { + *readval = st->regs_hw[reg]; + ret = 0; + } + mutex_unlock(&indio_dev->mlock); + + return ret; +} + +static int adf4350_tune_r_cnt(struct adf4350_state *st, unsigned short r_cnt) +{ + struct adf4350_platform_data *pdata = st->pdata; + + do { + r_cnt++; + st->fpfd = (st->clkin * (pdata->ref_doubler_en ? 2 : 1)) / + (r_cnt * (pdata->ref_div2_en ? 2 : 1)); + } while (st->fpfd > ADF4350_MAX_FREQ_PFD); + + return r_cnt; +} + +static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq) +{ + struct adf4350_platform_data *pdata = st->pdata; + u64 tmp; + u32 div_gcd, prescaler, chspc; + u16 mdiv, r_cnt = 0; + u8 band_sel_div; + + if (freq > ADF4350_MAX_OUT_FREQ || freq < st->min_out_freq) + return -EINVAL; + + if (freq > ADF4350_MAX_FREQ_45_PRESC) { + prescaler = ADF4350_REG1_PRESCALER; + mdiv = 75; + } else { + prescaler = 0; + mdiv = 23; + } + + st->r4_rf_div_sel = 0; + + while (freq < ADF4350_MIN_VCO_FREQ) { + freq <<= 1; + st->r4_rf_div_sel++; + } + + /* + * Allow a predefined reference division factor + * if not set, compute our own + */ + if (pdata->ref_div_factor) + r_cnt = pdata->ref_div_factor - 1; + + chspc = st->chspc; + + do { + do { + do { + r_cnt = adf4350_tune_r_cnt(st, r_cnt); + st->r1_mod = st->fpfd / chspc; + if (r_cnt > ADF4350_MAX_R_CNT) { + /* try higher spacing values */ + chspc++; + r_cnt = 0; + } + } while ((st->r1_mod > ADF4350_MAX_MODULUS) && r_cnt); + } while (r_cnt == 0); + + tmp = freq * (u64)st->r1_mod + (st->fpfd >> 1); + do_div(tmp, st->fpfd); /* Div round closest (n + d/2)/d */ + st->r0_fract = do_div(tmp, st->r1_mod); + st->r0_int = tmp; + } while (mdiv > st->r0_int); + + band_sel_div = DIV_ROUND_UP(st->fpfd, ADF4350_MAX_BANDSEL_CLK); + + if (st->r0_fract && st->r1_mod) { + div_gcd = gcd(st->r1_mod, st->r0_fract); + st->r1_mod /= div_gcd; + st->r0_fract /= div_gcd; + } else { + st->r0_fract = 0; + st->r1_mod = 1; + } + + dev_dbg(&st->spi->dev, "VCO: %llu Hz, PFD %lu Hz\n" + "REF_DIV %d, R0_INT %d, R0_FRACT %d\n" + "R1_MOD %d, RF_DIV %d\nPRESCALER %s, BAND_SEL_DIV %d\n", + freq, st->fpfd, r_cnt, st->r0_int, st->r0_fract, st->r1_mod, + 1 << st->r4_rf_div_sel, prescaler ? "8/9" : "4/5", + band_sel_div); + + st->regs[ADF4350_REG0] = ADF4350_REG0_INT(st->r0_int) | + ADF4350_REG0_FRACT(st->r0_fract); + + st->regs[ADF4350_REG1] = ADF4350_REG1_PHASE(1) | + ADF4350_REG1_MOD(st->r1_mod) | + prescaler; + + st->regs[ADF4350_REG2] = + ADF4350_REG2_10BIT_R_CNT(r_cnt) | + ADF4350_REG2_DOUBLE_BUFF_EN | + (pdata->ref_doubler_en ? ADF4350_REG2_RMULT2_EN : 0) | + (pdata->ref_div2_en ? ADF4350_REG2_RDIV2_EN : 0) | + (pdata->r2_user_settings & (ADF4350_REG2_PD_POLARITY_POS | + ADF4350_REG2_LDP_6ns | ADF4350_REG2_LDF_INT_N | + ADF4350_REG2_CHARGE_PUMP_CURR_uA(5000) | + ADF4350_REG2_MUXOUT(0x7) | ADF4350_REG2_NOISE_MODE(0x3))); + + st->regs[ADF4350_REG3] = pdata->r3_user_settings & + (ADF4350_REG3_12BIT_CLKDIV(0xFFF) | + ADF4350_REG3_12BIT_CLKDIV_MODE(0x3) | + ADF4350_REG3_12BIT_CSR_EN | + ADF4351_REG3_CHARGE_CANCELLATION_EN | + ADF4351_REG3_ANTI_BACKLASH_3ns_EN | + ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH); + + st->regs[ADF4350_REG4] = + ADF4350_REG4_FEEDBACK_FUND | + ADF4350_REG4_RF_DIV_SEL(st->r4_rf_div_sel) | + ADF4350_REG4_8BIT_BAND_SEL_CLKDIV(band_sel_div) | + ADF4350_REG4_RF_OUT_EN | + (pdata->r4_user_settings & + (ADF4350_REG4_OUTPUT_PWR(0x3) | + ADF4350_REG4_AUX_OUTPUT_PWR(0x3) | + ADF4350_REG4_AUX_OUTPUT_EN | + ADF4350_REG4_AUX_OUTPUT_FUND | + ADF4350_REG4_MUTE_TILL_LOCK_EN)); + + st->regs[ADF4350_REG5] = ADF4350_REG5_LD_PIN_MODE_DIGITAL; + st->freq_req = freq; + + return adf4350_sync_config(st); +} + +static ssize_t adf4350_write(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct adf4350_state *st = iio_priv(indio_dev); + unsigned long long readin; + unsigned long tmp; + int ret; + + ret = kstrtoull(buf, 10, &readin); + if (ret) + return ret; + + mutex_lock(&indio_dev->mlock); + switch ((u32)private) { + case ADF4350_FREQ: + ret = adf4350_set_freq(st, readin); + break; + case ADF4350_FREQ_REFIN: + if (readin > ADF4350_MAX_FREQ_REFIN) { + ret = -EINVAL; + break; + } + + if (st->clk) { + tmp = clk_round_rate(st->clk, readin); + if (tmp != readin) { + ret = -EINVAL; + break; + } + ret = clk_set_rate(st->clk, tmp); + if (ret < 0) + break; + } + st->clkin = readin; + ret = adf4350_set_freq(st, st->freq_req); + break; + case ADF4350_FREQ_RESOLUTION: + if (readin == 0) + ret = -EINVAL; + else + st->chspc = readin; + break; + case ADF4350_PWRDOWN: + if (readin) + st->regs[ADF4350_REG2] |= ADF4350_REG2_POWER_DOWN_EN; + else + st->regs[ADF4350_REG2] &= ~ADF4350_REG2_POWER_DOWN_EN; + + adf4350_sync_config(st); + break; + default: + ret = -EINVAL; + } + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + +static ssize_t adf4350_read(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct adf4350_state *st = iio_priv(indio_dev); + unsigned long long val; + int ret = 0; + + mutex_lock(&indio_dev->mlock); + switch ((u32)private) { + case ADF4350_FREQ: + val = (u64)((st->r0_int * st->r1_mod) + st->r0_fract) * + (u64)st->fpfd; + do_div(val, st->r1_mod * (1 << st->r4_rf_div_sel)); + /* PLL unlocked? return error */ + if (gpio_is_valid(st->pdata->gpio_lock_detect)) + if (!gpio_get_value(st->pdata->gpio_lock_detect)) { + dev_dbg(&st->spi->dev, "PLL un-locked\n"); + ret = -EBUSY; + } + break; + case ADF4350_FREQ_REFIN: + if (st->clk) + st->clkin = clk_get_rate(st->clk); + + val = st->clkin; + break; + case ADF4350_FREQ_RESOLUTION: + val = st->chspc; + break; + case ADF4350_PWRDOWN: + val = !!(st->regs[ADF4350_REG2] & ADF4350_REG2_POWER_DOWN_EN); + break; + default: + ret = -EINVAL; + val = 0; + } + mutex_unlock(&indio_dev->mlock); + + return ret < 0 ? ret : sprintf(buf, "%llu\n", val); +} + +#define _ADF4350_EXT_INFO(_name, _ident) { \ + .name = _name, \ + .read = adf4350_read, \ + .write = adf4350_write, \ + .private = _ident, \ + .shared = IIO_SEPARATE, \ +} + +static const struct iio_chan_spec_ext_info adf4350_ext_info[] = { + /* Ideally we use IIO_CHAN_INFO_FREQUENCY, but there are + * values > 2^32 in order to support the entire frequency range + * in Hz. Using scale is a bit ugly. + */ + _ADF4350_EXT_INFO("frequency", ADF4350_FREQ), + _ADF4350_EXT_INFO("frequency_resolution", ADF4350_FREQ_RESOLUTION), + _ADF4350_EXT_INFO("refin_frequency", ADF4350_FREQ_REFIN), + _ADF4350_EXT_INFO("powerdown", ADF4350_PWRDOWN), + { }, +}; + +static const struct iio_chan_spec adf4350_chan = { + .type = IIO_ALTVOLTAGE, + .indexed = 1, + .output = 1, + .ext_info = adf4350_ext_info, +}; + +static const struct iio_info adf4350_info = { + .debugfs_reg_access = &adf4350_reg_access, +}; + +#ifdef CONFIG_OF +static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct adf4350_platform_data *pdata; + unsigned int tmp; + int ret; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + strncpy(&pdata->name[0], np->name, SPI_NAME_SIZE - 1); + + tmp = 10000; + of_property_read_u32(np, "adi,channel-spacing", &tmp); + pdata->channel_spacing = tmp; + + tmp = 0; + of_property_read_u32(np, "adi,power-up-frequency", &tmp); + pdata->power_up_frequency = tmp; + + tmp = 0; + of_property_read_u32(np, "adi,reference-div-factor", &tmp); + pdata->ref_div_factor = tmp; + + ret = of_get_gpio(np, 0); + if (ret < 0) + pdata->gpio_lock_detect = -1; + else + pdata->gpio_lock_detect = ret; + + pdata->ref_doubler_en = of_property_read_bool(np, + "adi,reference-doubler-enable"); + pdata->ref_div2_en = of_property_read_bool(np, + "adi,reference-div2-enable"); + + /* r2_user_settings */ + pdata->r2_user_settings = of_property_read_bool(np, + "adi,phase-detector-polarity-positive-enable") ? + ADF4350_REG2_PD_POLARITY_POS : 0; + pdata->r2_user_settings |= of_property_read_bool(np, + "adi,lock-detect-precision-6ns-enable") ? + ADF4350_REG2_LDP_6ns : 0; + pdata->r2_user_settings |= of_property_read_bool(np, + "adi,lock-detect-function-integer-n-enable") ? + ADF4350_REG2_LDF_INT_N : 0; + + tmp = 2500; + of_property_read_u32(np, "adi,charge-pump-current", &tmp); + pdata->r2_user_settings |= ADF4350_REG2_CHARGE_PUMP_CURR_uA(tmp); + + tmp = 0; + of_property_read_u32(np, "adi,muxout-select", &tmp); + pdata->r2_user_settings |= ADF4350_REG2_MUXOUT(tmp); + + pdata->r2_user_settings |= of_property_read_bool(np, + "adi,low-spur-mode-enable") ? + ADF4350_REG2_NOISE_MODE(0x3) : 0; + + /* r3_user_settings */ + + pdata->r3_user_settings = of_property_read_bool(np, + "adi,cycle-slip-reduction-enable") ? + ADF4350_REG3_12BIT_CSR_EN : 0; + pdata->r3_user_settings |= of_property_read_bool(np, + "adi,charge-cancellation-enable") ? + ADF4351_REG3_CHARGE_CANCELLATION_EN : 0; + + pdata->r3_user_settings |= of_property_read_bool(np, + "adi,anti-backlash-3ns-enable") ? + ADF4351_REG3_ANTI_BACKLASH_3ns_EN : 0; + pdata->r3_user_settings |= of_property_read_bool(np, + "adi,band-select-clock-mode-high-enable") ? + ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH : 0; + + tmp = 0; + of_property_read_u32(np, "adi,12bit-clk-divider", &tmp); + pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV(tmp); + + tmp = 0; + of_property_read_u32(np, "adi,clk-divider-mode", &tmp); + pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV_MODE(tmp); + + /* r4_user_settings */ + + pdata->r4_user_settings = of_property_read_bool(np, + "adi,aux-output-enable") ? + ADF4350_REG4_AUX_OUTPUT_EN : 0; + pdata->r4_user_settings |= of_property_read_bool(np, + "adi,aux-output-fundamental-enable") ? + ADF4350_REG4_AUX_OUTPUT_FUND : 0; + pdata->r4_user_settings |= of_property_read_bool(np, + "adi,mute-till-lock-enable") ? + ADF4350_REG4_MUTE_TILL_LOCK_EN : 0; + + tmp = 0; + of_property_read_u32(np, "adi,output-power", &tmp); + pdata->r4_user_settings |= ADF4350_REG4_OUTPUT_PWR(tmp); + + tmp = 0; + of_property_read_u32(np, "adi,aux-output-power", &tmp); + pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_PWR(tmp); + + return pdata; +} +#else +static +struct adf4350_platform_data *adf4350_parse_dt(struct device *dev) +{ + return NULL; +} +#endif + +static int adf4350_probe(struct spi_device *spi) +{ + struct adf4350_platform_data *pdata; + struct iio_dev *indio_dev; + struct adf4350_state *st; + struct clk *clk = NULL; + int ret; + + if (spi->dev.of_node) { + pdata = adf4350_parse_dt(&spi->dev); + if (pdata == NULL) + return -EINVAL; + } else { + pdata = spi->dev.platform_data; + } + + if (!pdata) { + dev_warn(&spi->dev, "no platform data? using default\n"); + pdata = &default_pdata; + } + + if (!pdata->clkin) { + clk = devm_clk_get(&spi->dev, "clkin"); + if (IS_ERR(clk)) + return -EPROBE_DEFER; + + ret = clk_prepare_enable(clk); + if (ret < 0) + return ret; + } + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_clk; + } + + st = iio_priv(indio_dev); + + st->reg = devm_regulator_get(&spi->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_disable_clk; + } + + spi_set_drvdata(spi, indio_dev); + st->spi = spi; + st->pdata = pdata; + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = (pdata->name[0] != 0) ? pdata->name : + spi_get_device_id(spi)->name; + + indio_dev->info = &adf4350_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = &adf4350_chan; + indio_dev->num_channels = 1; + + st->chspc = pdata->channel_spacing; + if (clk) { + st->clk = clk; + st->clkin = clk_get_rate(clk); + } else { + st->clkin = pdata->clkin; + } + + st->min_out_freq = spi_get_device_id(spi)->driver_data == 4351 ? + ADF4351_MIN_OUT_FREQ : ADF4350_MIN_OUT_FREQ; + + memset(st->regs_hw, 0xFF, sizeof(st->regs_hw)); + + if (gpio_is_valid(pdata->gpio_lock_detect)) { + ret = devm_gpio_request(&spi->dev, pdata->gpio_lock_detect, + indio_dev->name); + if (ret) { + dev_err(&spi->dev, "fail to request lock detect GPIO-%d", + pdata->gpio_lock_detect); + goto error_disable_reg; + } + gpio_direction_input(pdata->gpio_lock_detect); + } + + if (pdata->power_up_frequency) { + ret = adf4350_set_freq(st, pdata->power_up_frequency); + if (ret) + goto error_disable_reg; + } + + ret = iio_device_register(indio_dev); + if (ret) + goto error_disable_reg; + + return 0; + +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_disable_clk: + if (clk) + clk_disable_unprepare(clk); + + return ret; +} + +static int adf4350_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct adf4350_state *st = iio_priv(indio_dev); + struct regulator *reg = st->reg; + + st->regs[ADF4350_REG2] |= ADF4350_REG2_POWER_DOWN_EN; + adf4350_sync_config(st); + + iio_device_unregister(indio_dev); + + if (st->clk) + clk_disable_unprepare(st->clk); + + if (!IS_ERR(reg)) + regulator_disable(reg); + + return 0; +} + +static const struct of_device_id adf4350_of_match[] = { + { .compatible = "adi,adf4350", }, + { .compatible = "adi,adf4351", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, adf4350_of_match); + +static const struct spi_device_id adf4350_id[] = { + {"adf4350", 4350}, + {"adf4351", 4351}, + {} +}; +MODULE_DEVICE_TABLE(spi, adf4350_id); + +static struct spi_driver adf4350_driver = { + .driver = { + .name = "adf4350", + .of_match_table = of_match_ptr(adf4350_of_match), + }, + .probe = adf4350_probe, + .remove = adf4350_remove, + .id_table = adf4350_id, +}; +module_spi_driver(adf4350_driver); + +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); +MODULE_DESCRIPTION("Analog Devices ADF4350/ADF4351 PLL"); +MODULE_LICENSE("GPL v2"); |