[PATCH 3/6] iio: imx8qxp-adc: Add the detail for NXP i.MX8QuadXPlus ADC driver
Cai Huoqing
caihuoqing at baidu.com
Mon Aug 30 10:21:37 PDT 2021
The NXP i.MX 8QuadXPlus SOC has a new ADC IP, so add the detail for NXP
i.MX8QuadXPlus ADC driver which includes: probe/remove/pm_ops/iio_dev.
Signed-off-by: Cai Huoqing <caihuoqing at baidu.com>
---
drivers/iio/adc/imx8qxp-adc.c | 513 ++++++++++++++++++++++++++++++++++
1 file changed, 513 insertions(+)
diff --git a/drivers/iio/adc/imx8qxp-adc.c b/drivers/iio/adc/imx8qxp-adc.c
index aec1b45c8fb9..d39bf382c582 100644
--- a/drivers/iio/adc/imx8qxp-adc.c
+++ b/drivers/iio/adc/imx8qxp-adc.c
@@ -20,23 +20,536 @@
#define ADC_DRIVER_NAME "imx8qxp-adc"
+/* Register map definition */
+#define ADC_CTRL 0x10
+#define ADC_STAT 0x14
+#define ADC_IE 0x18
+#define ADC_DE 0x1c
+#define ADC_CFG 0x20
+#define ADC_FCTRL 0x30
+#define ADC_SWTRIG 0x34
+#define ADC_TCTRL(tid) (0xc0 + tid * 4)
+#define ADC_CMDH(cid) (0x100 + cid * 8)
+#define ADC_CMDL(cid) (0x104 + cid * 8)
+#define ADC_RESFIFO 0x300
+#define ADC_TST 0xffc
+
+/* ADC bit shift */
+#define ADC_IE_FWMIE_SHIFT (0)
+#define ADC_CTRL_FIFO_RESET_SHIFT (8)
+#define ADC_CTRL_SOFTWARE_RESET_SHIFT (1)
+#define ADC_CTRL_ADC_ENABLE (0)
+#define ADC_TCTRL_TCMD_SHIFT (24)
+#define ADC_TCTRL_TDLY_SHIFT (16)
+#define ADC_TCTRL_TPRI_SHIFT (8)
+#define ADC_TCTRL_HTEN_SHIFT (0)
+#define ADC_CMDL_CSCALE_SHIFT (8)
+#define ADC_CMDL_MODE_SHIFT (7)
+#define ADC_CMDL_DIFF_SHIFT (6)
+#define ADC_CMDL_ABSEL_SHIFT (5)
+#define ADC_CMDL_ADCH_SHIFT (0)
+#define ADC_CMDH_NEXT_SHIFT (24)
+#define ADC_CMDH_LOOP_SHIFT (16)
+#define ADC_CMDH_AVGS_SHIFT (12)
+#define ADC_CMDH_STS_SHIFT (8)
+#define ADC_CMDH_LWI_SHIFT (7)
+#define ADC_CMDH_CMPEN_SHIFT (0)
+#define ADC_CFG_PWREN_SHIFT (28)
+#define ADC_CFG_PUDLY_SHIFT (16)
+#define ADC_CFG_REFSEL_SHIFT (6)
+#define ADC_CFG_PWRSEL_SHIFT (4)
+#define ADC_CFG_TPRICTRL_SHIFT (0)
+#define ADC_FCTRL_FWMARK_SHIFT (16)
+#define ADC_FCTRL_FWMARK_MASK (0x1f << 16)
+#define ADC_FCTRL_FCOUNT_MASK (0x1f)
+
+/* ADC PARAMETER*/
+#define ADC_CMDL_CHANNEL_SCALE_FULL (0x3f)
+#define ADC_CMDL_SEL_A_A_B_CHANNEL (0)
+#define ADC_CMDL_STANDARD_RESOLUTION (0)
+#define ADC_CMDL_MODE_SINGLE (0)
+#define ADC_CMDH_LWI_INCREMENT_DISABLE (0)
+#define ADC_CMDH_CMPEN_DISABLE (0)
+#define ADC_PAUSE_ENABLE (0x80000000)
+#define ADC_TCTRL_TPRI_PRIORITY_HIGH (0)
+
+#define ADC_TCTRL_HTEN_HARDWARE_TIRGGER_DISABLE (0)
+
+#define MAX_CMD (8)
+#define MAX_TRIG (8)
+
+#define ADC_TIMEOUT msecs_to_jiffies(100)
+
+struct imx8qxp_adc_trigger_ctrl {
+ u32 tcmd;
+ u32 tdly;
+ u32 tpri;
+ u32 hten;
+};
+
+struct imx8qxp_adc_cmd_l {
+ u32 scale;
+ u32 mode;
+ u32 diff;
+ u32 absel;
+ u32 adch;
+};
+
+struct imx8qxp_adc_cmd_h {
+ u32 next;
+ u32 loop;
+ u32 avgs;
+ u32 sts;
+ u32 lwi;
+ u32 cmpen;
+};
+
+struct imx8qxp_adc_cfg {
+ u32 pwren;
+ u32 pudly;
+ u32 refsel;
+ u32 pwrsel;
+ u32 tprictrl;
+};
+
+struct imx8qxp_adc {
+ struct device *dev;
+ void __iomem *regs;
+ struct clk *clk;
+ struct clk *ipg_clk;
+
+ u32 vref_uv;
+ u32 value;
+ u32 channel_id;
+ u32 trigger_id;
+ u32 cmd_id;
+
+ struct regulator *vref;
+ struct imx8qxp_adc_cmd_l adc_cmd_l[MAX_CMD + 1];
+ struct imx8qxp_adc_cmd_h adc_cmd_h[MAX_CMD + 1];
+ struct imx8qxp_adc_trigger_ctrl adc_trigger_ctrl[MAX_TRIG + 1];
+ struct imx8qxp_adc_cfg adc_cfg;
+ struct completion completion;
+};
+
+#define IMX8QXP_ADC_CHAN(_idx) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = (_idx), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+}
+
+static const struct iio_chan_spec imx8qxp_adc_iio_channels[] = {
+ IMX8QXP_ADC_CHAN(0),
+ IMX8QXP_ADC_CHAN(1),
+ IMX8QXP_ADC_CHAN(2),
+ IMX8QXP_ADC_CHAN(3),
+ IMX8QXP_ADC_CHAN(4),
+ IMX8QXP_ADC_CHAN(5),
+ IMX8QXP_ADC_CHAN(6),
+ IMX8QXP_ADC_CHAN(7),
+};
+
+static void imx8qxp_adc_feature_prepare(struct imx8qxp_adc *adc)
+{
+ u32 i;
+
+ adc->trigger_id = 0;
+ adc->cmd_id = 0;
+ adc->channel_id = 0;
+
+ for (i = 0; i < MAX_CMD + 1; i++) {
+ adc->adc_cmd_l[i].scale = 1;
+ adc->adc_cmd_l[i].mode = 0;
+ adc->adc_cmd_l[i].diff = 0;
+ adc->adc_cmd_l[i].absel = 0;
+ adc->adc_cmd_l[i].adch = 0;
+ adc->adc_cmd_h[i].next = 0;
+ adc->adc_cmd_h[i].loop = 0;
+ adc->adc_cmd_h[i].avgs = 0;
+ adc->adc_cmd_h[i].sts = 0;
+ adc->adc_cmd_h[i].lwi = 0;
+ adc->adc_cmd_h[i].cmpen = 0;
+ }
+
+ for (i = 0; i < MAX_TRIG; i++) {
+ adc->adc_trigger_ctrl[i].tcmd = 0;
+ adc->adc_trigger_ctrl[i].tdly = 0;
+ adc->adc_trigger_ctrl[i].tpri = 0;
+ adc->adc_trigger_ctrl[i].hten = 0;
+ }
+
+ adc->adc_cfg.pwren = 0;
+ adc->adc_cfg.pudly = 0;
+ adc->adc_cfg.refsel = 0;
+ adc->adc_cfg.pwrsel = 0;
+ adc->adc_cfg.tprictrl = 0;
+}
+
+static void imx8qxp_adc_reset(struct imx8qxp_adc *adc)
+{
+ u32 ctrl;
+
+ /*software reset, need to clear the set bit*/
+ ctrl = readl(adc->regs + ADC_CTRL);
+ ctrl |= 1 << ADC_CTRL_SOFTWARE_RESET_SHIFT;
+ writel(ctrl, adc->regs + ADC_CTRL);
+ udelay(10);
+ ctrl &= ~(1 << ADC_CTRL_SOFTWARE_RESET_SHIFT);
+ writel(ctrl, adc->regs + ADC_CTRL);
+
+ /* reset the fifo */
+ ctrl |= 1 << ADC_CTRL_FIFO_RESET_SHIFT;
+ writel(ctrl, adc->regs + ADC_CTRL);
+}
+
+static void imx8qxp_adc_reg_config(struct imx8qxp_adc *adc)
+{
+ u32 adc_cfg, adc_tctrl, adc_cmdl, adc_cmdh;
+ u32 t_id, c_id;
+
+ adc_cfg = adc->adc_cfg.pwren << ADC_CFG_PWREN_SHIFT |
+ adc->adc_cfg.pudly << ADC_CFG_PUDLY_SHIFT |
+ adc->adc_cfg.refsel << ADC_CFG_REFSEL_SHIFT |
+ adc->adc_cfg.pwrsel << ADC_CFG_PWRSEL_SHIFT |
+ adc->adc_cfg.tprictrl << ADC_CFG_TPRICTRL_SHIFT;
+ writel(adc_cfg, adc->regs + ADC_CFG);
+
+ t_id = adc->trigger_id;
+ adc_tctrl = adc->adc_trigger_ctrl[t_id].tcmd << ADC_TCTRL_TCMD_SHIFT |
+ adc->adc_trigger_ctrl[t_id].tdly << ADC_TCTRL_TDLY_SHIFT |
+ adc->adc_trigger_ctrl[t_id].tpri << ADC_TCTRL_TPRI_SHIFT |
+ adc->adc_trigger_ctrl[t_id].hten << ADC_TCTRL_HTEN_SHIFT;
+ writel(adc_tctrl, adc->regs + ADC_TCTRL(t_id));
+
+ c_id = adc->cmd_id - 1;
+ adc_cmdl = adc->adc_cmd_l[c_id].scale << ADC_CMDL_CSCALE_SHIFT |
+ adc->adc_cmd_l[c_id].mode << ADC_CMDL_MODE_SHIFT |
+ adc->adc_cmd_l[c_id].diff << ADC_CMDL_DIFF_SHIFT |
+ adc->adc_cmd_l[c_id].absel << ADC_CMDL_ABSEL_SHIFT |
+ adc->adc_cmd_l[c_id].adch << ADC_CMDL_ADCH_SHIFT;
+ writel(adc_cmdl, adc->regs + ADC_CMDL(c_id));
+
+ adc_cmdh = adc->adc_cmd_h[c_id].next << ADC_CMDH_NEXT_SHIFT |
+ adc->adc_cmd_h[c_id].loop << ADC_CMDH_LOOP_SHIFT |
+ adc->adc_cmd_h[c_id].avgs << ADC_CMDH_AVGS_SHIFT |
+ adc->adc_cmd_h[c_id].sts << ADC_CMDH_STS_SHIFT |
+ adc->adc_cmd_h[c_id].lwi << ADC_CMDH_LWI_SHIFT |
+ adc->adc_cmd_h[c_id].cmpen << ADC_CMDH_CMPEN_SHIFT;
+ writel(adc_cmdh, adc->regs + ADC_CMDH(c_id));
+}
+
+static void imx8qxp_adc_mode_config(struct imx8qxp_adc *adc)
+{
+ u32 cmd_id, trigger_id, channel_id;
+
+ channel_id = adc->channel_id;
+ cmd_id = adc->cmd_id - 1;
+ trigger_id = adc->trigger_id;
+
+ /* config the cmd */
+ adc->adc_cmd_l[cmd_id].scale = ADC_CMDL_CHANNEL_SCALE_FULL;
+ adc->adc_cmd_l[cmd_id].mode = ADC_CMDL_STANDARD_RESOLUTION;
+ adc->adc_cmd_l[cmd_id].diff = ADC_CMDL_MODE_SINGLE;
+ adc->adc_cmd_l[cmd_id].absel = ADC_CMDL_SEL_A_A_B_CHANNEL;
+ adc->adc_cmd_l[cmd_id].adch = channel_id;
+
+ adc->adc_cmd_h[cmd_id].next = 0;
+ adc->adc_cmd_h[cmd_id].loop = 0;
+ adc->adc_cmd_h[cmd_id].avgs = 7;
+ adc->adc_cmd_h[cmd_id].sts = 0;
+ adc->adc_cmd_h[cmd_id].lwi = ADC_CMDH_LWI_INCREMENT_DISABLE;
+ adc->adc_cmd_h[cmd_id].cmpen = ADC_CMDH_CMPEN_DISABLE;
+
+ /* config the trigger control */
+ adc->adc_trigger_ctrl[trigger_id].tcmd = adc->cmd_id;
+ adc->adc_trigger_ctrl[trigger_id].tdly = 0;
+ adc->adc_trigger_ctrl[trigger_id].tpri = ADC_TCTRL_TPRI_PRIORITY_HIGH;
+ adc->adc_trigger_ctrl[trigger_id].hten = ADC_TCTRL_HTEN_HARDWARE_TIRGGER_DISABLE;
+
+ /* ADC configuration */
+ adc->adc_cfg.pwren = 1;
+ adc->adc_cfg.pudly = 0x80;
+ adc->adc_cfg.refsel = 0;
+ adc->adc_cfg.pwrsel = 3;
+ adc->adc_cfg.tprictrl = 0;
+
+ imx8qxp_adc_reg_config(adc);
+}
+
+static void imx8qxp_adc_fifo_config(struct imx8qxp_adc *adc)
+{
+ u32 fifo_ctrl, interrupt_en;
+
+ fifo_ctrl = readl(adc->regs + ADC_FCTRL);
+ fifo_ctrl &= ~ADC_FCTRL_FWMARK_MASK;
+ /* set the watermark level to 1 */
+ fifo_ctrl |= 0 << ADC_FCTRL_FWMARK_SHIFT;
+ writel(fifo_ctrl, adc->regs + ADC_FCTRL);
+
+ /* FIFO Watermark Interrupt Enable */
+ interrupt_en = readl(adc->regs + ADC_IE);
+ interrupt_en |= 1 << ADC_IE_FWMIE_SHIFT;
+ writel(interrupt_en, adc->regs + ADC_IE);
+}
+
+static void imx8qxp_adc_disable(struct imx8qxp_adc *adc)
+{
+ u32 ctrl;
+
+ ctrl = readl(adc->regs + ADC_CTRL) & ~(1 << ADC_CTRL_ADC_ENABLE);
+ writel(ctrl, adc->regs + ADC_CTRL);
+}
+
+static int imx8qxp_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct imx8qxp_adc *adc = iio_priv(indio_dev);
+ struct device *dev = adc->dev;
+
+ u32 channel;
+ u32 ctrl;
+ long ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ pm_runtime_get_sync(dev);
+
+ mutex_lock(&indio_dev->mlock);
+ reinit_completion(&adc->completion);
+
+ channel = chan->channel & 0x07;
+ adc->channel_id = channel;
+ adc->cmd_id = 1;
+ adc->trigger_id = 0;
+ imx8qxp_adc_mode_config(adc);
+
+ imx8qxp_adc_fifo_config(adc);
+
+ /* adc enable */
+ ctrl = readl(adc->regs + ADC_CTRL) | (1 << ADC_CTRL_ADC_ENABLE);
+ writel(ctrl, adc->regs + ADC_CTRL);
+ /* adc start */
+ writel(1 << adc->trigger_id, adc->regs + ADC_SWTRIG);
+
+ ret = wait_for_completion_interruptible_timeout
+ (&adc->completion, ADC_TIMEOUT);
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_sync_autosuspend(dev);
+
+ if (ret == 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return -ETIMEDOUT;
+ }
+ if (ret < 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ }
+
+ *val = adc->value;
+ mutex_unlock(&indio_dev->mlock);
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ adc->vref_uv = regulator_get_voltage(adc->vref);
+ *val = adc->vref_uv / 1000;
+ *val2 = 12;
+ return IIO_VAL_FRACTIONAL_LOG2;
+
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = clk_get_rate(adc->clk) / 3;
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static irqreturn_t imx8qxp_adc_isr(int irq, void *dev_id)
+{
+ struct imx8qxp_adc *adc = (struct imx8qxp_adc *)dev_id;
+
+ u32 fifo_count;
+
+ fifo_count = readl(adc->regs + ADC_FCTRL)
+ & ADC_FCTRL_FCOUNT_MASK;
+
+ if (fifo_count) {
+ adc->value = (readl(adc->regs + ADC_RESFIFO) & 0xffff) >> 3;
+ complete(&adc->completion);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int imx8qxp_adc_reg_access(struct iio_dev *indio_dev, unsigned int reg,
+ unsigned int writeval, unsigned int *readval)
+{
+ struct imx8qxp_adc *adc = iio_priv(indio_dev);
+ struct device *dev = adc->dev;
+
+ if (!readval || reg % 4 || reg > ADC_TST)
+ return -EINVAL;
+
+ pm_runtime_get_sync(dev);
+
+ *readval = readl(adc->regs + reg);
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_sync_autosuspend(dev);
+
+ return 0;
+}
+
+static const struct iio_info imx8qxp_adc_iio_info = {
+ .read_raw = &imx8qxp_adc_read_raw,
+ .debugfs_reg_access = &imx8qxp_adc_reg_access,
+};
+
static int imx8qxp_adc_probe(struct platform_device *pdev)
{
+ struct imx8qxp_adc *adc;
+ struct iio_dev *indio_dev;
+ struct device *dev = &pdev->dev;
+ int irq;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
+ if (!indio_dev) {
+ dev_err(dev, "Failed allocating iio device\n");
+ return -ENOMEM;
+ }
+
+ adc = iio_priv(indio_dev);
+ adc->dev = dev;
+
+ adc->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(adc->regs))
+ return PTR_ERR(adc->regs);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ adc->clk = devm_clk_get(dev, "per");
+ if (IS_ERR(adc->clk)) {
+ ret = PTR_ERR(adc->clk);
+ dev_err(dev, "Failed getting clock, err = %d\n", ret);
+ return ret;
+ }
+
+ adc->ipg_clk = devm_clk_get(dev, "ipg");
+ if (IS_ERR(adc->ipg_clk)) {
+ ret = PTR_ERR(adc->ipg_clk);
+ dev_err(dev, "Failed getting clock, err = %d\n", ret);
+ return ret;
+ }
+
+ adc->vref = devm_regulator_get(dev, "vref");
+ if (IS_ERR(adc->vref)) {
+ ret = PTR_ERR(adc->vref);
+ dev_err(dev,
+ "Failed getting reference voltage, err = %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ init_completion(&adc->completion);
+
+ indio_dev->name = dev_name(dev);
+ indio_dev->info = &imx8qxp_adc_iio_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = imx8qxp_adc_iio_channels;
+ indio_dev->num_channels = ARRAY_SIZE(imx8qxp_adc_iio_channels);
+
+ ret = devm_request_irq(dev, irq, imx8qxp_adc_isr, 0, dev_name(dev), adc);
+ if (ret < 0) {
+ dev_err(dev, "Failed requesting irq, irq = %d\n", irq);
+ return ret;
+ }
+
+ imx8qxp_adc_feature_prepare(adc);
+ imx8qxp_adc_reset(adc);
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ imx8qxp_adc_disable(adc);
+ dev_err(dev, "Couldn't register the device.\n");
+ return ret;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_set_autosuspend_delay(dev, 50);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_enable(dev);
+
return 0;
}
static int imx8qxp_adc_remove(struct platform_device *pdev)
{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct imx8qxp_adc *adc = iio_priv(indio_dev);
+ struct device *dev = adc->dev;
+
+ pm_runtime_get_sync(dev);
+
+ iio_device_unregister(indio_dev);
+
+ imx8qxp_adc_disable(adc);
+
+ pm_runtime_disable(dev);
+ pm_runtime_put_noidle(dev);
+
return 0;
}
static int imx8qxp_adc_runtime_suspend(struct device *dev)
{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct imx8qxp_adc *adc = iio_priv(indio_dev);
+
+ imx8qxp_adc_disable(adc);
+
+ clk_disable_unprepare(adc->clk);
+ clk_disable_unprepare(adc->ipg_clk);
+ regulator_disable(adc->vref);
+
return 0;
}
static int imx8qxp_adc_runtime_resume(struct device *dev)
{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct imx8qxp_adc *adc = iio_priv(indio_dev);
+ int ret;
+
+ ret = regulator_enable(adc->vref);
+ if (ret) {
+ dev_err(dev, "Can't enable adc reference top voltage, err = %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(adc->clk);
+ if (ret) {
+ dev_err(dev, "Could not prepare or enable clock.\n");
+ regulator_disable(adc->vref);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(adc->ipg_clk);
+ if (ret) {
+ dev_err(dev, "Could not prepare or enable clock.\n");
+ clk_disable_unprepare(adc->clk);
+ regulator_disable(adc->vref);
+ return ret;
+ }
+ imx8qxp_adc_reset(adc);
+
return 0;
}
--
2.25.1
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