[PATCH 2/2] USB: dwc2: Add OTG support for Ingenic SoCs.

["周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>]

Add OTG support for the JZ4775 SoC, the JZ4780 SoC, the X1000
SoC, the X1600 SoC, the X1830 SoC, and the X2000 SoC. Introduce
support for disable Ingenic overcurrent detection, once selected
it enables GOTGCTL register bits VbvalidOvEn and VbvalidOvVal to
disable the VBUS overcurrent detection.

This patch is derived from Dragan Čečavac (in the kernel 3.18.3
tree of CI20). It is very useful for the MIPS Creator CI20 (r1).
Without this patch, OTG port of CI20 has a great probability to
face overcurrent warning, which breaks the OTG functionality.

Signed-off-by: Dragan Čečavac <dragancecavac@yahoo.com>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 drivers/usb/dwc2/core.c   |  9 +++++++++
 drivers/usb/dwc2/core.h   |  5 +++++
 drivers/usb/dwc2/params.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index 272ae57..c35b2e2 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -1153,6 +1153,7 @@ static void dwc2_set_turnaround_time(struct dwc2_hsotg *hsotg)
 int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
 {
 	u32 usbcfg;
+	u32 otgctl;
 	int retval = 0;
 
 	if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
@@ -1187,6 +1188,14 @@ int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
 		dwc2_writel(hsotg, usbcfg, GUSBCFG);
 	}
 
+	if (hsotg->params.deactivate_ingenic_overcurrent_detection) {
+		if (dwc2_is_host_mode(hsotg)) {
+			otgctl = readl(hsotg->regs + GOTGCTL);
+			otgctl |= GOTGCTL_VBVALOEN | GOTGCTL_VBVALOVAL;
+			writel(otgctl, hsotg->regs + GOTGCTL);
+		}
+	}
+
 	return retval;
 }
 
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index ab6b815..e026d13 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -418,6 +418,10 @@ enum dwc2_ep0_state {
  *			detection using GGPIO register.
  *			0 - Deactivate the external level detection (default)
  *			1 - Activate the external level detection
+ * @deactivate_ingenic_overcurrent_detection: Deactivate Ingenic overcurrent
+ *			detection.
+ *			0 - Activate the overcurrent detection (default)
+ *			1 - Deactivate the overcurrent detection
  * @g_dma:              Enables gadget dma usage (default: autodetect).
  * @g_dma_desc:         Enables gadget descriptor DMA (default: autodetect).
  * @g_rx_fifo_size:	The periodic rx fifo size for the device, in
@@ -489,6 +493,7 @@ struct dwc2_core_params {
 	u8 hird_threshold;
 	bool activate_stm_fs_transceiver;
 	bool activate_stm_id_vb_detection;
+	bool deactivate_ingenic_overcurrent_detection;
 	bool ipg_isoc_en;
 	u16 max_packet_count;
 	u32 max_transfer_size;
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index 67c5eb1..a7a1b50 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -71,6 +71,47 @@ static void dwc2_set_his_params(struct dwc2_hsotg *hsotg)
 	p->power_down = DWC2_POWER_DOWN_PARAM_NONE;
 }
 
+static void dwc2_set_jz4775_params(struct dwc2_hsotg *hsotg)
+{
+	struct dwc2_core_params *p = &hsotg->params;
+
+	p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE;
+	p->speed = DWC2_SPEED_PARAM_HIGH;
+	p->phy_type = DWC2_PHY_TYPE_PARAM_UTMI;
+	p->phy_utmi_width = 16;
+	p->deactivate_ingenic_overcurrent_detection =
+		device_property_read_bool(hsotg->dev, "disable-over-current");
+}
+
+static void dwc2_set_x1600_params(struct dwc2_hsotg *hsotg)
+{
+	struct dwc2_core_params *p = &hsotg->params;
+
+	p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE;
+	p->speed = DWC2_SPEED_PARAM_HIGH;
+	p->host_channels = 16;
+	p->phy_type = DWC2_PHY_TYPE_PARAM_UTMI;
+	p->phy_utmi_width = 16;
+	p->deactivate_ingenic_overcurrent_detection =
+		device_property_read_bool(hsotg->dev, "disable-over-current");
+}
+
+static void dwc2_set_x2000_params(struct dwc2_hsotg *hsotg)
+{
+	struct dwc2_core_params *p = &hsotg->params;
+
+	p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE;
+	p->speed = DWC2_SPEED_PARAM_HIGH;
+	p->host_rx_fifo_size = 1024;
+	p->host_nperio_tx_fifo_size = 1024;
+	p->host_perio_tx_fifo_size = 1024;
+	p->host_channels = 16;
+	p->phy_type = DWC2_PHY_TYPE_PARAM_UTMI;
+	p->phy_utmi_width = 16;
+	p->deactivate_ingenic_overcurrent_detection =
+		device_property_read_bool(hsotg->dev, "disable-over-current");
+}
+
 static void dwc2_set_s3c6400_params(struct dwc2_hsotg *hsotg)
 {
 	struct dwc2_core_params *p = &hsotg->params;
@@ -202,7 +243,13 @@ static void dwc2_set_stm32mp15_hsotg_params(struct dwc2_hsotg *hsotg)
 
 const struct of_device_id dwc2_of_match_table[] = {
 	{ .compatible = "brcm,bcm2835-usb", .data = dwc2_set_bcm_params },
-	{ .compatible = "hisilicon,hi6220-usb", .data = dwc2_set_his_params  },
+	{ .compatible = "hisilicon,hi6220-usb", .data = dwc2_set_his_params },
+	{ .compatible = "ingenic,jz4775-otg", .data = dwc2_set_jz4775_params },
+	{ .compatible = "ingenic,jz4780-otg", .data = dwc2_set_jz4775_params },
+	{ .compatible = "ingenic,x1000-otg", .data = dwc2_set_jz4775_params },
+	{ .compatible = "ingenic,x1600-otg", .data = dwc2_set_x1600_params },
+	{ .compatible = "ingenic,x1830-otg", .data = dwc2_set_x1600_params },
+	{ .compatible = "ingenic,x2000-otg", .data = dwc2_set_x2000_params },
 	{ .compatible = "rockchip,rk3066-usb", .data = dwc2_set_rk_params },
 	{ .compatible = "lantiq,arx100-usb", .data = dwc2_set_ltq_params },
 	{ .compatible = "lantiq,xrx200-usb", .data = dwc2_set_ltq_params },
-- 
2.7.4