diff options
| -rw-r--r-- | MAINTAINERS | 8 | ||||
| -rw-r--r-- | drivers/iio/adc/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/iio/adc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/iio/adc/rzg2l_adc.c | 600 |
4 files changed, 619 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index e8793413935e..e2eb0d3561f9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15856,6 +15856,14 @@ L: linux-renesas-soc@vger.kernel.org S: Maintained F: drivers/phy/renesas/phy-rcar-gen3-usb*.c +RENESAS RZ/G2L A/D DRIVER +M: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> +L: linux-iio@vger.kernel.org +L: linux-renesas-soc@vger.kernel.org +S: Supported +F: Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml +F: drivers/iio/adc/rzg2l_adc.c + RESET CONTROLLER FRAMEWORK M: Philipp Zabel <p.zabel@pengutronix.de> S: Maintained diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index db0c8fb60515..af168e1c9fdb 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -887,6 +887,16 @@ config ROCKCHIP_SARADC To compile this driver as a module, choose M here: the module will be called rockchip_saradc. +config RZG2L_ADC + tristate "Renesas RZ/G2L ADC driver" + depends on ARCH_R9A07G044 || COMPILE_TEST + help + Say yes here to build support for the ADC found in Renesas + RZ/G2L family. + + To compile this driver as a module, choose M here: the + module will be called rzg2l_adc. + config SC27XX_ADC tristate "Spreadtrum SC27xx series PMICs ADC" depends on MFD_SC27XX_PMIC || COMPILE_TEST diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index f70d877c555a..d68550f493e3 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -82,6 +82,7 @@ obj-$(CONFIG_QCOM_PM8XXX_XOADC) += qcom-pm8xxx-xoadc.o obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o obj-$(CONFIG_RN5T618_ADC) += rn5t618-adc.o obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o +obj-$(CONFIG_RZG2L_ADC) += rzg2l_adc.o obj-$(CONFIG_SC27XX_ADC) += sc27xx_adc.o obj-$(CONFIG_SPEAR_ADC) += spear_adc.o obj-$(CONFIG_STX104) += stx104.o diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c new file mode 100644 index 000000000000..9996d5eef289 --- /dev/null +++ b/drivers/iio/adc/rzg2l_adc.c @@ -0,0 +1,600 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * RZ/G2L A/D Converter driver + * + * Copyright (c) 2021 Renesas Electronics Europe GmbH + * + * Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> + +#define DRIVER_NAME "rzg2l-adc" + +#define RZG2L_ADM(n) ((n) * 0x4) +#define RZG2L_ADM0_ADCE BIT(0) +#define RZG2L_ADM0_ADBSY BIT(1) +#define RZG2L_ADM0_PWDWNB BIT(2) +#define RZG2L_ADM0_SRESB BIT(15) +#define RZG2L_ADM1_TRG BIT(0) +#define RZG2L_ADM1_MS BIT(2) +#define RZG2L_ADM1_BS BIT(4) +#define RZG2L_ADM1_EGA_MASK GENMASK(13, 12) +#define RZG2L_ADM2_CHSEL_MASK GENMASK(7, 0) +#define RZG2L_ADM3_ADIL_MASK GENMASK(31, 24) +#define RZG2L_ADM3_ADCMP_MASK GENMASK(23, 16) +#define RZG2L_ADM3_ADCMP_E FIELD_PREP(RZG2L_ADM3_ADCMP_MASK, 0xe) +#define RZG2L_ADM3_ADSMP_MASK GENMASK(15, 0) + +#define RZG2L_ADINT 0x20 +#define RZG2L_ADINT_INTEN_MASK GENMASK(7, 0) +#define RZG2L_ADINT_CSEEN BIT(16) +#define RZG2L_ADINT_INTS BIT(31) + +#define RZG2L_ADSTS 0x24 +#define RZG2L_ADSTS_CSEST BIT(16) +#define RZG2L_ADSTS_INTST_MASK GENMASK(7, 0) + +#define RZG2L_ADIVC 0x28 +#define RZG2L_ADIVC_DIVADC_MASK GENMASK(8, 0) +#define RZG2L_ADIVC_DIVADC_4 FIELD_PREP(RZG2L_ADIVC_DIVADC_MASK, 0x4) + +#define RZG2L_ADFIL 0x2c + +#define RZG2L_ADCR(n) (0x30 + ((n) * 0x4)) +#define RZG2L_ADCR_AD_MASK GENMASK(11, 0) + +#define RZG2L_ADSMP_DEFUALT_SAMPLING 0x578 + +#define RZG2L_ADC_MAX_CHANNELS 8 +#define RZG2L_ADC_CHN_MASK 0x7 +#define RZG2L_ADC_TIMEOUT usecs_to_jiffies(1 * 4) + +struct rzg2l_adc_data { + const struct iio_chan_spec *channels; + u8 num_channels; +}; + +struct rzg2l_adc { + void __iomem *base; + struct clk *pclk; + struct clk *adclk; + struct reset_control *presetn; + struct reset_control *adrstn; + struct completion completion; + const struct rzg2l_adc_data *data; + struct mutex lock; + u16 last_val[RZG2L_ADC_MAX_CHANNELS]; +}; + +static const char * const rzg2l_adc_channel_name[] = { + "adc0", + "adc1", + "adc2", + "adc3", + "adc4", + "adc5", + "adc6", + "adc7", +}; + +static unsigned int rzg2l_adc_readl(struct rzg2l_adc *adc, u32 reg) +{ + return readl(adc->base + reg); +} + +static void rzg2l_adc_writel(struct rzg2l_adc *adc, unsigned int reg, u32 val) +{ + writel(val, adc->base + reg); +} + +static void rzg2l_adc_pwr(struct rzg2l_adc *adc, bool on) +{ + u32 reg; + + reg = rzg2l_adc_readl(adc, RZG2L_ADM(0)); + if (on) + reg |= RZG2L_ADM0_PWDWNB; + else + reg &= ~RZG2L_ADM0_PWDWNB; + rzg2l_adc_writel(adc, RZG2L_ADM(0), reg); + udelay(2); +} + +static void rzg2l_adc_start_stop(struct rzg2l_adc *adc, bool start) +{ + int timeout = 5; + u32 reg; + + reg = rzg2l_adc_readl(adc, RZG2L_ADM(0)); + if (start) + reg |= RZG2L_ADM0_ADCE; + else + reg &= ~RZG2L_ADM0_ADCE; + rzg2l_adc_writel(adc, RZG2L_ADM(0), reg); + + if (start) + return; + + do { + usleep_range(100, 200); + reg = rzg2l_adc_readl(adc, RZG2L_ADM(0)); + timeout--; + if (!timeout) { + pr_err("%s stopping ADC timed out\n", __func__); + break; + } + } while (((reg & RZG2L_ADM0_ADBSY) || (reg & RZG2L_ADM0_ADCE))); +} + +static void rzg2l_set_trigger(struct rzg2l_adc *adc) +{ + u32 reg; + + /* + * Setup ADM1 for SW trigger + * EGA[13:12] - Set 00 to indicate hardware trigger is invalid + * BS[4] - Enable 1-buffer mode + * MS[1] - Enable Select mode + * TRG[0] - Enable software trigger mode + */ + reg = rzg2l_adc_readl(adc, RZG2L_ADM(1)); + reg &= ~RZG2L_ADM1_EGA_MASK; + reg &= ~RZG2L_ADM1_BS; + reg &= ~RZG2L_ADM1_TRG; + reg |= RZG2L_ADM1_MS; + rzg2l_adc_writel(adc, RZG2L_ADM(1), reg); +} + +static int rzg2l_adc_conversion_setup(struct rzg2l_adc *adc, u8 ch) +{ + u32 reg; + + if (rzg2l_adc_readl(adc, RZG2L_ADM(0)) & RZG2L_ADM0_ADBSY) + return -EBUSY; + + rzg2l_set_trigger(adc); + + /* Select analog input channel subjected to conversion. */ + reg = rzg2l_adc_readl(adc, RZG2L_ADM(2)); + reg &= ~RZG2L_ADM2_CHSEL_MASK; + reg |= BIT(ch); + rzg2l_adc_writel(adc, RZG2L_ADM(2), reg); + + /* + * Setup ADINT + * INTS[31] - Select pulse signal + * CSEEN[16] - Enable channel select error interrupt + * INTEN[7:0] - Select channel interrupt + */ + reg = rzg2l_adc_readl(adc, RZG2L_ADINT); + reg &= ~RZG2L_ADINT_INTS; + reg &= ~RZG2L_ADINT_INTEN_MASK; + reg |= (RZG2L_ADINT_CSEEN | BIT(ch)); + rzg2l_adc_writel(adc, RZG2L_ADINT, reg); + + return 0; +} + +static int rzg2l_adc_set_power(struct iio_dev *indio_dev, bool on) +{ + struct device *dev = indio_dev->dev.parent; + + if (on) + return pm_runtime_resume_and_get(dev); + + return pm_runtime_put_sync(dev); +} + +static int rzg2l_adc_conversion(struct iio_dev *indio_dev, struct rzg2l_adc *adc, u8 ch) +{ + int ret; + + ret = rzg2l_adc_set_power(indio_dev, true); + if (ret) + return ret; + + ret = rzg2l_adc_conversion_setup(adc, ch); + if (ret) { + rzg2l_adc_set_power(indio_dev, false); + return ret; + } + + reinit_completion(&adc->completion); + + rzg2l_adc_start_stop(adc, true); + + if (!wait_for_completion_timeout(&adc->completion, RZG2L_ADC_TIMEOUT)) { + rzg2l_adc_writel(adc, RZG2L_ADINT, + rzg2l_adc_readl(adc, RZG2L_ADINT) & ~RZG2L_ADINT_INTEN_MASK); + rzg2l_adc_start_stop(adc, false); + rzg2l_adc_set_power(indio_dev, false); + return -ETIMEDOUT; + } + + return rzg2l_adc_set_power(indio_dev, false); +} + +static int rzg2l_adc_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct rzg2l_adc *adc = iio_priv(indio_dev); + int ret; + u8 ch; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (chan->type != IIO_VOLTAGE) + return -EINVAL; + + mutex_lock(&adc->lock); + ch = chan->channel & RZG2L_ADC_CHN_MASK; + ret = rzg2l_adc_conversion(indio_dev, adc, ch); + if (ret) { + mutex_unlock(&adc->lock); + return ret; + } + *val = adc->last_val[ch]; + mutex_unlock(&adc->lock); + + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int rzg2l_adc_read_label(struct iio_dev *iio_dev, + const struct iio_chan_spec *chan, + char *label) +{ + if (chan->channel >= RZG2L_ADC_MAX_CHANNELS) + return -EINVAL; + + return sysfs_emit(label, "%s\n", rzg2l_adc_channel_name[chan->channel]); +} + +static const struct iio_info rzg2l_adc_iio_info = { + .read_raw = rzg2l_adc_read_raw, + .read_label = rzg2l_adc_read_label, +}; + +static irqreturn_t rzg2l_adc_isr(int irq, void *dev_id) +{ + struct rzg2l_adc *adc = dev_id; + unsigned long intst; + u32 reg; + int ch; + + reg = rzg2l_adc_readl(adc, RZG2L_ADSTS); + + /* A/D conversion channel select error interrupt */ + if (reg & RZG2L_ADSTS_CSEST) { + rzg2l_adc_writel(adc, RZG2L_ADSTS, reg); + return IRQ_HANDLED; + } + + intst = reg & RZG2L_ADSTS_INTST_MASK; + if (!intst) + return IRQ_NONE; + + for_each_set_bit(ch, &intst, RZG2L_ADC_MAX_CHANNELS) + adc->last_val[ch] = rzg2l_adc_readl(adc, RZG2L_ADCR(ch)) & RZG2L_ADCR_AD_MASK; + + /* clear the channel interrupt */ + rzg2l_adc_writel(adc, RZG2L_ADSTS, reg); + + complete(&adc->completion); + + return IRQ_HANDLED; +} + +static int rzg2l_adc_parse_properties(struct platform_device *pdev, struct rzg2l_adc *adc) +{ + struct iio_chan_spec *chan_array; + struct fwnode_handle *fwnode; + struct rzg2l_adc_data *data; + unsigned int channel; + int num_channels; + int ret; + u8 i; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + num_channels = device_get_child_node_count(&pdev->dev); + if (!num_channels) { + dev_err(&pdev->dev, "no channel children\n"); + return -ENODEV; + } + + if (num_channels > RZG2L_ADC_MAX_CHANNELS) { + dev_err(&pdev->dev, "num of channel children out of range\n"); + return -EINVAL; + } + + chan_array = devm_kcalloc(&pdev->dev, num_channels, sizeof(*chan_array), + GFP_KERNEL); + if (!chan_array) + return -ENOMEM; + + i = 0; + device_for_each_child_node(&pdev->dev, fwnode) { + ret = fwnode_property_read_u32(fwnode, "reg", &channel); + if (ret) + return ret; + + if (channel >= RZG2L_ADC_MAX_CHANNELS) + return -EINVAL; + + chan_array[i].type = IIO_VOLTAGE; + chan_array[i].indexed = 1; + chan_array[i].channel = channel; + chan_array[i].info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan_array[i].datasheet_name = rzg2l_adc_channel_name[channel]; + i++; + } + + data->num_channels = num_channels; + data->channels = chan_array; + adc->data = data; + + return 0; +} + +static int rzg2l_adc_hw_init(struct rzg2l_adc *adc) +{ + int timeout = 5; + u32 reg; + int ret; + + ret = clk_prepare_enable(adc->pclk); + if (ret) + return ret; + + /* SW reset */ + reg = rzg2l_adc_readl(adc, RZG2L_ADM(0)); + reg |= RZG2L_ADM0_SRESB; + rzg2l_adc_writel(adc, RZG2L_ADM(0), reg); + + while (!(rzg2l_adc_readl(adc, RZG2L_ADM(0)) & RZG2L_ADM0_SRESB)) { + if (!timeout) { + ret = -EBUSY; + goto exit_hw_init; + } + timeout--; + usleep_range(100, 200); + } + + /* Only division by 4 can be set */ + reg = rzg2l_adc_readl(adc, RZG2L_ADIVC); + reg &= ~RZG2L_ADIVC_DIVADC_MASK; + reg |= RZG2L_ADIVC_DIVADC_4; + rzg2l_adc_writel(adc, RZG2L_ADIVC, reg); + + /* + * Setup AMD3 + * ADIL[31:24] - Should be always set to 0 + * ADCMP[23:16] - Should be always set to 0xe + * ADSMP[15:0] - Set default (0x578) sampling period + */ + reg = rzg2l_adc_readl(adc, RZG2L_ADM(3)); + reg &= ~RZG2L_ADM3_ADIL_MASK; + reg &= ~RZG2L_ADM3_ADCMP_MASK; + reg &= ~RZG2L_ADM3_ADSMP_MASK; + reg |= (RZG2L_ADM3_ADCMP_E | RZG2L_ADSMP_DEFUALT_SAMPLING); + rzg2l_adc_writel(adc, RZG2L_ADM(3), reg); + +exit_hw_init: + clk_disable_unprepare(adc->pclk); + + return 0; +} + +static void rzg2l_adc_pm_runtime_disable(void *data) +{ + struct device *dev = data; + + pm_runtime_disable(dev->parent); +} + +static void rzg2l_adc_pm_runtime_set_suspended(void *data) +{ + struct device *dev = data; + + pm_runtime_set_suspended(dev->parent); +} + +static void rzg2l_adc_reset_assert(void *data) +{ + reset_control_assert(data); +} + +static int rzg2l_adc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct iio_dev *indio_dev; + struct rzg2l_adc *adc; + int ret; + int irq; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*adc)); + if (!indio_dev) + return -ENOMEM; + + adc = iio_priv(indio_dev); + + ret = rzg2l_adc_parse_properties(pdev, adc); + if (ret) + return ret; + + mutex_init(&adc->lock); + + adc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(adc->base)) + return PTR_ERR(adc->base); + + adc->pclk = devm_clk_get(dev, "pclk"); + if (IS_ERR(adc->pclk)) { + dev_err(dev, "Failed to get pclk"); + return PTR_ERR(adc->pclk); + } + + adc->adclk = devm_clk_get(dev, "adclk"); + if (IS_ERR(adc->adclk)) { + dev_err(dev, "Failed to get adclk"); + return PTR_ERR(adc->adclk); + } + + adc->adrstn = devm_reset_control_get_exclusive(dev, "adrst-n"); + if (IS_ERR(adc->adrstn)) { + dev_err(dev, "failed to get adrstn\n"); + return PTR_ERR(adc->adrstn); + } + + adc->presetn = devm_reset_control_get_exclusive(dev, "presetn"); + if (IS_ERR(adc->presetn)) { + dev_err(dev, "failed to get presetn\n"); + return PTR_ERR(adc->presetn); + } + + ret = reset_control_deassert(adc->adrstn); + if (ret) { + dev_err(&pdev->dev, "failed to deassert adrstn pin, %d\n", ret); + return ret; + } + + ret = devm_add_action_or_reset(&pdev->dev, + rzg2l_adc_reset_assert, adc->adrstn); + if (ret) { + dev_err(&pdev->dev, "failed to register adrstn assert devm action, %d\n", + ret); + return ret; + } + + ret = reset_control_deassert(adc->presetn); + if (ret) { + dev_err(&pdev->dev, "failed to deassert presetn pin, %d\n", ret); + return ret; + } + + ret = devm_add_action_or_reset(&pdev->dev, + rzg2l_adc_reset_assert, adc->presetn); + if (ret) { + dev_err(&pdev->dev, "failed to register presetn assert devm action, %d\n", + ret); + return ret; + } + + ret = rzg2l_adc_hw_init(adc); + if (ret) { + dev_err(&pdev->dev, "failed to initialize ADC HW, %d\n", ret); + return ret; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(dev, "no irq resource\n"); + return irq; + } + + ret = devm_request_irq(dev, irq, rzg2l_adc_isr, + 0, dev_name(dev), adc); + if (ret < 0) + return ret; + + init_completion(&adc->completion); + + platform_set_drvdata(pdev, indio_dev); + + indio_dev->name = DRIVER_NAME; + indio_dev->info = &rzg2l_adc_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = adc->data->channels; + indio_dev->num_channels = adc->data->num_channels; + + pm_runtime_set_suspended(dev); + ret = devm_add_action_or_reset(&pdev->dev, + rzg2l_adc_pm_runtime_set_suspended, &indio_dev->dev); + if (ret) + return ret; + + pm_runtime_enable(dev); + ret = devm_add_action_or_reset(&pdev->dev, + rzg2l_adc_pm_runtime_disable, &indio_dev->dev); + if (ret) + return ret; + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct of_device_id rzg2l_adc_match[] = { + { .compatible = "renesas,rzg2l-adc",}, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rzg2l_adc_match); + +static int __maybe_unused rzg2l_adc_pm_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct rzg2l_adc *adc = iio_priv(indio_dev); + + rzg2l_adc_pwr(adc, false); + clk_disable_unprepare(adc->adclk); + clk_disable_unprepare(adc->pclk); + + return 0; +} + +static int __maybe_unused rzg2l_adc_pm_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct rzg2l_adc *adc = iio_priv(indio_dev); + int ret; + + ret = clk_prepare_enable(adc->pclk); + if (ret) + return ret; + + ret = clk_prepare_enable(adc->adclk); + if (ret) + return ret; + + rzg2l_adc_pwr(adc, true); + + return 0; +} + +static const struct dev_pm_ops rzg2l_adc_pm_ops = { + SET_RUNTIME_PM_OPS(rzg2l_adc_pm_runtime_suspend, + rzg2l_adc_pm_runtime_resume, + NULL) +}; + +static struct platform_driver rzg2l_adc_driver = { + .probe = rzg2l_adc_probe, + .driver = { + .name = DRIVER_NAME, + .of_match_table = rzg2l_adc_match, + .pm = &rzg2l_adc_pm_ops, + }, +}; + +module_platform_driver(rzg2l_adc_driver); + +MODULE_AUTHOR("Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>"); +MODULE_DESCRIPTION("Renesas RZ/G2L ADC driver"); +MODULE_LICENSE("GPL v2"); |