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kernel/drivers/iio/frequency/adf4350.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* ADF4350/ADF4351 SPI Wideband Synthesizer driver
*
* Copyright 2012-2013 Analog Devices Inc.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.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/gcd.h>
#include <linux/gpio/consumer.h>
#include <asm/div64.h>
#include <linux/clk.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 gpio_desc *lock_detect_gpiod;
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;
/*
* Lock to protect the state of the device from potential concurrent
* writes. The device is configured via a sequence of SPI writes,
* and this lock is meant to prevent the start of another sequence
* before another one has finished.
*/
struct mutex lock;
/*
* 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,
};
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(&st->lock);
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(&st->lock);
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(&st->lock);
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(&st->lock);
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(&st->lock);
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 (st->lock_detect_gpiod)
if (!gpiod_get_value(st->lock_detect_gpiod)) {
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(&st->lock);
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,
};
static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
{
struct adf4350_platform_data *pdata;
unsigned int tmp;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
snprintf(pdata->name, sizeof(pdata->name), "%pfw", dev_fwnode(dev));
tmp = 10000;
device_property_read_u32(dev, "adi,channel-spacing", &tmp);
pdata->channel_spacing = tmp;
tmp = 0;
device_property_read_u32(dev, "adi,power-up-frequency", &tmp);
pdata->power_up_frequency = tmp;
tmp = 0;
device_property_read_u32(dev, "adi,reference-div-factor", &tmp);
pdata->ref_div_factor = tmp;
pdata->ref_doubler_en = device_property_read_bool(dev, "adi,reference-doubler-enable");
pdata->ref_div2_en = device_property_read_bool(dev, "adi,reference-div2-enable");
/* r2_user_settings */
pdata->r2_user_settings = 0;
if (device_property_read_bool(dev, "adi,phase-detector-polarity-positive-enable"))
pdata->r2_user_settings |= ADF4350_REG2_PD_POLARITY_POS;
if (device_property_read_bool(dev, "adi,lock-detect-precision-6ns-enable"))
pdata->r2_user_settings |= ADF4350_REG2_LDP_6ns;
if (device_property_read_bool(dev, "adi,lock-detect-function-integer-n-enable"))
pdata->r2_user_settings |= ADF4350_REG2_LDF_INT_N;
tmp = 2500;
device_property_read_u32(dev, "adi,charge-pump-current", &tmp);
pdata->r2_user_settings |= ADF4350_REG2_CHARGE_PUMP_CURR_uA(tmp);
tmp = 0;
device_property_read_u32(dev, "adi,muxout-select", &tmp);
pdata->r2_user_settings |= ADF4350_REG2_MUXOUT(tmp);
if (device_property_read_bool(dev, "adi,low-spur-mode-enable"))
pdata->r2_user_settings |= ADF4350_REG2_NOISE_MODE(0x3);
/* r3_user_settings */
pdata->r3_user_settings = 0;
if (device_property_read_bool(dev, "adi,cycle-slip-reduction-enable"))
pdata->r3_user_settings |= ADF4350_REG3_12BIT_CSR_EN;
if (device_property_read_bool(dev, "adi,charge-cancellation-enable"))
pdata->r3_user_settings |= ADF4351_REG3_CHARGE_CANCELLATION_EN;
if (device_property_read_bool(dev, "adi,anti-backlash-3ns-enable"))
pdata->r3_user_settings |= ADF4351_REG3_ANTI_BACKLASH_3ns_EN;
if (device_property_read_bool(dev, "adi,band-select-clock-mode-high-enable"))
pdata->r3_user_settings |= ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH;
tmp = 0;
device_property_read_u32(dev, "adi,12bit-clk-divider", &tmp);
pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV(tmp);
tmp = 0;
device_property_read_u32(dev, "adi,clk-divider-mode", &tmp);
pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV_MODE(tmp);
/* r4_user_settings */
pdata->r4_user_settings = 0;
if (device_property_read_bool(dev, "adi,aux-output-enable"))
pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_EN;
if (device_property_read_bool(dev, "adi,aux-output-fundamental-enable"))
pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_FUND;
if (device_property_read_bool(dev, "adi,mute-till-lock-enable"))
pdata->r4_user_settings |= ADF4350_REG4_MUTE_TILL_LOCK_EN;
tmp = 0;
device_property_read_u32(dev, "adi,output-power", &tmp);
pdata->r4_user_settings |= ADF4350_REG4_OUTPUT_PWR(tmp);
tmp = 0;
device_property_read_u32(dev, "adi,aux-output-power", &tmp);
pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_PWR(tmp);
return pdata;
}
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 (dev_fwnode(&spi->dev)) {
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->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;
mutex_init(&st->lock);
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));
st->lock_detect_gpiod = devm_gpiod_get_optional(&spi->dev, NULL,
GPIOD_IN);
if (IS_ERR(st->lock_detect_gpiod)) {
ret = PTR_ERR(st->lock_detect_gpiod);
goto error_disable_reg;
}
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:
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);
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 = 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");
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