phy: rcar-gen3-usb2: add runtime ID/VBUS pin detection

This patch adds support for runtime ID/VBUS pin detection if
the channel 0 of R-Car gen3 is used. So, we are able to use
the channel as both host and peripheral.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
index affa0f7..2390e4e 100644 (file)
--- a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
+++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
@@ -18,6 +18,7 @@ properties. This is because HSUSB has registers to select USB 2.0 host or
 peripheral at that channel:
 - reg: offset and length of the partial HSUSB register block.
 - reg-names: must be "hsusb".
+- interrupts: interrupt specifier for the PHY.
 
 Example (R-Car H3):
 
@@ -25,6 +26,7 @@ Example (R-Car H3):
                compatible = "renesas,usb2-phy-r8a7795";
                reg = <0 0xee080200 0 0x700>, <0 0xe6590100 0 0x100>;
                reg-names = "usb2_host", "hsusb";
+               interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
                clocks = <&mstp7_clks R8A7795_CLK_EHCI0>,
                         <&mstp7_clks R8A7795_CLK_HSUSB>;
        };

diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
index 2b5d890..ef332ef 100644 (file)
--- a/drivers/phy/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/phy-rcar-gen3-usb2.c
@@ -12,6 +12,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -25,14 +26,18 @@
 #define USB2_SPD_RSM_TIMSET    0x10c
 #define USB2_OC_TIMSET         0x110
 #define USB2_COMMCTRL          0x600
+#define USB2_OBINTSTA          0x604
+#define USB2_OBINTEN           0x608
 #define USB2_VBCTRL            0x60c
 #define USB2_LINECTRL1         0x610
 #define USB2_ADPCTRL           0x630
 
 /* INT_ENABLE */
+#define USB2_INT_ENABLE_UCOM_INTEN     BIT(3)
 #define USB2_INT_ENABLE_USBH_INTB_EN   BIT(2)
 #define USB2_INT_ENABLE_USBH_INTA_EN   BIT(1)
-#define USB2_INT_ENABLE_INIT           (USB2_INT_ENABLE_USBH_INTB_EN | \
+#define USB2_INT_ENABLE_INIT           (USB2_INT_ENABLE_UCOM_INTEN | \
+                                        USB2_INT_ENABLE_USBH_INTB_EN | \
                                         USB2_INT_ENABLE_USBH_INTA_EN)
 
 /* USBCTR */
@@ -48,6 +53,12 @@
 /* COMMCTRL */
 #define USB2_COMMCTRL_OTG_PERI         BIT(31) /* 1 = Peripheral mode */
 
+/* OBINTSTA and OBINTEN */
+#define USB2_OBINT_SESSVLDCHG          BIT(12)
+#define USB2_OBINT_IDDIGCHG            BIT(11)
+#define USB2_OBINT_BITS                        (USB2_OBINT_SESSVLDCHG | \
+                                        USB2_OBINT_IDDIGCHG)
+
 /* VBCTRL */
 #define USB2_VBCTRL_DRVVBUSSEL         BIT(8)
 
@@ -174,6 +185,9 @@ static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
 
        val = readl(usb2_base + USB2_VBCTRL);
        writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
+       writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
+       val = readl(usb2_base + USB2_OBINTEN);
+       writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
        val = readl(usb2_base + USB2_ADPCTRL);
        writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
        val = readl(usb2_base + USB2_LINECTRL1);
@@ -270,6 +284,23 @@ static struct phy_ops rcar_gen3_phy_usb2_ops = {
        .owner          = THIS_MODULE,
 };
 
+static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
+{
+       struct rcar_gen3_chan *ch = _ch;
+       void __iomem *usb2_base = ch->usb2.base;
+       u32 status = readl(usb2_base + USB2_OBINTSTA);
+       irqreturn_t ret = IRQ_NONE;
+
+       if (status & USB2_OBINT_BITS) {
+               dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
+               writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
+               rcar_gen3_device_recognition(ch);
+               ret = IRQ_HANDLED;
+       }
+
+       return ret;
+}
+
 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
        { .compatible = "renesas,usb2-phy-r8a7795" },
        { }
@@ -302,9 +333,19 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
 
        /* To avoid error message by devm_ioremap_resource() */
        if (res) {
+               int irq;
+
                channel->hsusb.base = devm_ioremap_resource(dev, res);
                if (IS_ERR(channel->hsusb.base))
                        channel->hsusb.base = NULL;
+               /* call request_irq for OTG */
+               irq = platform_get_irq(pdev, 0);
+               if (irq >= 0)
+                       irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
+                                              IRQF_SHARED, dev_name(dev),
+                                              channel);
+               if (irq < 0)
+                       dev_err(dev, "No irq handler (%d)\n", irq);
        }
 
        /* devm_phy_create() will call pm_runtime_enable(dev); */