[PATCH v2 3/6] usb: chipidea: imx: add HSIO Block Control wakeup setting

Xu Yang
2025-02-25T05:39:06Z

On i.MX95 platform, USB wakeup setting is controlled by HSIO Block
Control:

HSIO Block Control Overview:
- The HSIO block control include configuration and status registers that
provide miscellaneous top-level controls for clocking, beat limiter
enables, wakeup signal enables and interrupt status for the PCIe and USB
interfaces.

The wakeup function of HSIO blkctl is basically same as non-core, except
improvements about power lost cases. This will add the wakeup setting for
HSIO blkctl on i.MX95. It will firstly ioremap hsio blkctl memory, then do
wakeup setting as needs.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v2:
- add Rb tag
---
drivers/usb/chipidea/usbmisc_imx.c | 107 +++++++++++++++++++++++++++++
1 file changed, 107 insertions(+)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 1394881fde5f..f933fc70be66 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -139,6 +139,22 @@
#define MX6_USB_OTG_WAKEUP_BITS (MX6_BM_WAKEUP_ENABLE | MX6_BM_VBUS_WAKEUP | \
MX6_BM_ID_WAKEUP | MX6SX_BM_DPDM_WAKEUP_EN)

+/*
+ * HSIO Block Control Register
+ */
+
+#define BLKCTL_USB_WAKEUP_CTRL 0x0
+#define BLKCTL_OTG_WAKE_ENABLE BIT(31)
+#define BLKCTL_OTG_VBUS_SESSVALID BIT(4)
+#define BLKCTL_OTG_ID_WAKEUP_EN BIT(2)
+#define BLKCTL_OTG_VBUS_WAKEUP_EN BIT(1)
+#define BLKCTL_OTG_DPDM_WAKEUP_EN BIT(0)
+
+#define BLKCTL_WAKEUP_SOURCE (BLKCTL_OTG_WAKE_ENABLE | \
+ BLKCTL_OTG_ID_WAKEUP_EN | \
+ BLKCTL_OTG_VBUS_WAKEUP_EN | \
+ BLKCTL_OTG_DPDM_WAKEUP_EN)
+
struct usbmisc_ops {
/* It's called once when probe a usb device */
int (*init)(struct imx_usbmisc_data *data);
@@ -159,6 +175,7 @@ struct usbmisc_ops {

struct imx_usbmisc {
void __iomem *base;
+ void __iomem *blkctl;
spinlock_t lock;
const struct usbmisc_ops *ops;
};
@@ -1016,6 +1033,76 @@ static int usbmisc_imx6sx_power_lost_check(struct imx_usbmisc_data *data)
return 0;
}

+static u32 usbmisc_blkctl_wakeup_setting(struct imx_usbmisc_data *data)
+{
+ u32 wakeup_setting = BLKCTL_WAKEUP_SOURCE;
+
+ if (data->ext_id || data->available_role != USB_DR_MODE_OTG)
+ wakeup_setting &= ~BLKCTL_OTG_ID_WAKEUP_EN;
+
+ if (data->ext_vbus || data->available_role == USB_DR_MODE_HOST)
+ wakeup_setting &= ~BLKCTL_OTG_VBUS_WAKEUP_EN;
+
+ /* Select session valid as VBUS wakeup source */
+ wakeup_setting |= BLKCTL_OTG_VBUS_SESSVALID;
+
+ return wakeup_setting;
+}
+
+static int usbmisc_imx95_set_wakeup(struct imx_usbmisc_data *data, bool enabled)
+{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(&usbmisc->lock, flags);
+ val = readl(usbmisc->blkctl + BLKCTL_USB_WAKEUP_CTRL);
+ val &= ~BLKCTL_WAKEUP_SOURCE;
+
+ if (enabled)
+ val |= usbmisc_blkctl_wakeup_setting(data);
+
+ writel(val, usbmisc->blkctl + BLKCTL_USB_WAKEUP_CTRL);
+ spin_unlock_irqrestore(&usbmisc->lock, flags);
+
+ return 0;
+}
+
+static int usbmisc_imx95_init(struct imx_usbmisc_data *data)
+{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+ unsigned long flags;
+ u32 reg;
+
+ if (data->index >= 1)
+ return -EINVAL;
+
+ spin_lock_irqsave(&usbmisc->lock, flags);
+ reg = readl(usbmisc->base);
+
+ if (data->disable_oc) {
+ reg |= MX6_BM_OVER_CUR_DIS;
+ } else {
+ reg &= ~MX6_BM_OVER_CUR_DIS;
+
+ if (data->oc_pol_configured && data->oc_pol_active_low)
+ reg |= MX6_BM_OVER_CUR_POLARITY;
+ else if (data->oc_pol_configured)
+ reg &= ~MX6_BM_OVER_CUR_POLARITY;
+ }
+
+ if (data->pwr_pol == 1)
+ reg |= MX6_BM_PWR_POLARITY;
+
+ writel(reg, usbmisc->base);
+ spin_unlock_irqrestore(&usbmisc->lock, flags);
+
+ /* use HSIO blkctl wakeup as source, disable usbmisc setting*/
+ usbmisc_imx7d_set_wakeup(data, false);
+
+ return 0;
+}
+
static const struct usbmisc_ops imx25_usbmisc_ops = {
.init = usbmisc_imx25_init,
.post = usbmisc_imx25_post,
@@ -1068,6 +1155,14 @@ static const struct usbmisc_ops imx7ulp_usbmisc_ops = {
.power_lost_check = usbmisc_imx7d_power_lost_check,
};

+static const struct usbmisc_ops imx95_usbmisc_ops = {
+ .init = usbmisc_imx95_init,
+ .set_wakeup = usbmisc_imx95_set_wakeup,
+ .charger_detection = imx7d_charger_detection,
+ .power_lost_check = usbmisc_imx7d_power_lost_check,
+ .vbus_comparator_on = usbmisc_imx7d_vbus_comparator_on,
+};
+
static inline bool is_imx53_usbmisc(struct imx_usbmisc_data *data)
{
struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
@@ -1289,6 +1384,10 @@ static const struct of_device_id usbmisc_imx_dt_ids[] = {
.compatible = "fsl,imx8ulp-usbmisc",
.data = &imx7ulp_usbmisc_ops,
},
+ {
+ .compatible = "fsl,imx95-usbmisc",
+ .data = &imx95_usbmisc_ops,
+ },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
@@ -1296,6 +1395,7 @@ MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
static int usbmisc_imx_probe(struct platform_device *pdev)
{
struct imx_usbmisc *data;
+ struct resource *res;

data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
@@ -1307,6 +1407,13 @@ static int usbmisc_imx_probe(struct platform_device *pdev)
if (IS_ERR(data->base))
return PTR_ERR(data->base);

+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res) {
+ data->blkctl = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(data->blkctl))
+ return PTR_ERR(data->blkctl);
+ }
+
data->ops = of_device_get_match_data(&pdev->dev);
platform_set_drvdata(pdev, data);

--
2.34.1