mxs phy has data pin contact and usb charger detector blocks which
can be controlled by software to detect charger type for SDP, CDP and
DCP.
Signed-off-by: Li Jun <jun.li@xxxxxxx>
---
drivers/usb/phy/phy-mxs-usb.c | 154 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 154 insertions(+)
diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index 0e2f1a3..1f8a8eb 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -67,11 +67,26 @@
#define ANADIG_ANA_MISC0_SET 0x154
#define ANADIG_ANA_MISC0_CLR 0x158
+#define ANADIG_USB1_CHRG_DETECT_SET 0x1b4
+#define ANADIG_USB1_CHRG_DETECT_CLR 0x1b8
+#define ANADIG_USB1_CHRG_DETECT_EN_B BIT(20)
+#define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B BIT(19)
+#define ANADIG_USB1_CHRG_DETECT_CHK_CONTACT BIT(18)
+
#define ANADIG_USB1_VBUS_DET_STAT 0x1c0
+#define ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3)
+
+#define ANADIG_USB1_CHRG_DET_STAT 0x1d0
+#define ANADIG_USB1_CHRG_DET_STAT_DM_STATE BIT(2)
+#define ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED BIT(1)
+#define ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT BIT(0)
+
#define ANADIG_USB2_VBUS_DET_STAT 0x220
#define ANADIG_USB1_LOOPBACK_SET 0x1e4
#define ANADIG_USB1_LOOPBACK_CLR 0x1e8
+#define ANADIG_USB1_LOOPBACK_UTMI_TESTSTART BIT(0)
+
#define ANADIG_USB2_LOOPBACK_SET 0x244
#define ANADIG_USB2_LOOPBACK_CLR 0x248
@@ -479,6 +494,144 @@ static int mxs_phy_on_disconnect(struct usb_phy *phy,
return 0;
}
+#define MXS_USB_CHARGER_DATA_CONTACT_TIME_OUT 100
+static int mxs_charger_data_contact_detect(struct mxs_phy *x)
+{
+ struct regmap *regmap = x->regmap_anatop;
+ int i, stable_contact_count = 0;
+ u32 val;
+
+ /* Check if vbus is valid */
+ regmap_read(regmap, ANADIG_USB1_VBUS_DET_STAT, &val);
+ if (!(val & ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)) {
+ dev_err(x->phy.dev, "vbus is not valid\n");
+ return -EINVAL;
+ }
+
+ /* Enable charger detector */
+ regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR,
+ ANADIG_USB1_CHRG_DETECT_EN_B);
+ /*
+ * - Do not check whether a charger is connected to the USB port
+ * - Check whether the USB plug has been in contact with each other
+ */
+ regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
+ ANADIG_USB1_CHRG_DETECT_CHK_CONTACT |
+ ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
+
+ /* Check if plug is connected */
+ for (i = 0; i < MXS_USB_CHARGER_DATA_CONTACT_TIME_OUT; i = i + 1) {
+ regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
+ if (val & ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT) {
+ stable_contact_count++;
+ if (stable_contact_count > 5)
+ /* Data pin makes contact */
+ break;
+ else
+ usleep_range(5000, 10000);
+ } else {
+ stable_contact_count = 0;
+ usleep_range(5000, 6000);
+ }
+ }
+
+ if (i == MXS_USB_CHARGER_DATA_CONTACT_TIME_OUT) {
+ dev_err(x->phy.dev,
+ "Data pin can't make good contact.\n");
+ /* Disable charger detector */
+ regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
+ ANADIG_USB1_CHRG_DETECT_EN_B |
+ ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static enum usb_charger_type mxs_charger_primary_detection(struct mxs_phy *x)
+{
+ struct regmap *regmap = x->regmap_anatop;
+ enum usb_charger_type chgr_type = UNKNOWN_TYPE;
+ u32 val;
+
+ /*
+ * - Do check whether a charger is connected to the USB port
+ * - Do not Check whether the USB plug has been in contact with
+ * each other
+ */
+ regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR,
+ ANADIG_USB1_CHRG_DETECT_CHK_CONTACT |
+ ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
+
+ msleep(100);
+
+ /* Check if it is a charger */
+ regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
+ if (!(val & ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED)) {
+ chgr_type = SDP_TYPE;
+ dev_dbg(x->phy.dev, "It is a stardard downstream port\n");
+ }
+
+ /* Disable charger detector */
+ regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
+ ANADIG_USB1_CHRG_DETECT_EN_B |
+ ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
+
+ return chgr_type;
+}
+
+/*
+ * It must be called after DP is pulled up, which is used to
+ * differentiate DCP and CDP.
+ */
+enum usb_charger_type mxs_charger_secondary_detection(struct mxs_phy *x)
+{
+ struct regmap *regmap = x->regmap_anatop;
+ int val;
+
+ msleep(80);
+
+ regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
+ if (val & ANADIG_USB1_CHRG_DET_STAT_DM_STATE) {
+ dev_dbg(x->phy.dev, "It is a dedicate charging port\n");
+ return DCP_TYPE;
+ } else {
+ dev_dbg(x->phy.dev, "It is a charging downstream port\n");
+ return CDP_TYPE;
+ }
+}
+
+static enum usb_charger_type mxs_phy_charger_detect(struct usb_phy *phy)
+{
+ struct mxs_phy *mxs_phy = to_mxs_phy(phy);
+ struct regmap *regmap = mxs_phy->regmap_anatop;
+ void __iomem *base = phy->io_priv;
+ enum usb_charger_type chgr_type = UNKNOWN_TYPE;
+
+ if (mxs_charger_data_contact_detect(mxs_phy))
+ return chgr_type;
+
+ chgr_type = mxs_charger_primary_detection(mxs_phy);
+
+ if (chgr_type != SDP_TYPE) {
+ /* Pull up DP via test */
+ writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
+ base + HW_USBPHY_DEBUG_CLR);
+ regmap_write(regmap, ANADIG_USB1_LOOPBACK_SET,
+ ANADIG_USB1_LOOPBACK_UTMI_TESTSTART);
+
+ chgr_type = mxs_charger_secondary_detection(mxs_phy);
+
+ /* Stop the test */
+ regmap_write(regmap, ANADIG_USB1_LOOPBACK_CLR,
+ ANADIG_USB1_LOOPBACK_UTMI_TESTSTART);
+ writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
+ base + HW_USBPHY_DEBUG_SET);
+ }
+
+ return chgr_type;
+}
+
static int mxs_phy_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -567,6 +720,7 @@ static int mxs_phy_probe(struct platform_device *pdev)
mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
mxs_phy->phy.type = USB_PHY_TYPE_USB2;
mxs_phy->phy.set_wakeup = mxs_phy_set_wakeup;
+ mxs_phy->phy.charger_detect = mxs_phy_charger_detect;
mxs_phy->clk = clk;
mxs_phy->data = of_id->data;
--
2.7.4
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