usb: renesas_usbhs: add support for R-Car D3

This patch adds support for R-Car D3. This SoC needs to release
the PLL reset by the UGCTRL register. So, since this is not the same
as other R-Car Gen3 SoCs, this patch adds a new type as
"USBHS_TYPE_RCAR_GEN3_WITH_PLL".

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
index 9e18e00..e79f6e4 100644 (file)
--- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
+++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
@@ -10,6 +10,7 @@ Required properties:
        - "renesas,usbhs-r8a7794" for r8a7794 (R-Car E2) compatible device
        - "renesas,usbhs-r8a7795" for r8a7795 (R-Car H3) compatible device
        - "renesas,usbhs-r8a7796" for r8a7796 (R-Car M3-W) compatible device
+       - "renesas,usbhs-r8a77995" for r8a77995 (R-Car D3) compatible device
        - "renesas,rcar-gen2-usbhs" for R-Car Gen2 compatible device
        - "renesas,rcar-gen3-usbhs" for R-Car Gen3 compatible device
 

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 2a860e4..3e92a78 100644 (file)
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -486,6 +486,10 @@ static const struct of_device_id usbhs_of_match[] = {
                .data = (void *)USBHS_TYPE_RCAR_GEN3,
        },
        {
+               .compatible = "renesas,usbhs-r8a77995",
+               .data = (void *)USBHS_TYPE_RCAR_GEN3_WITH_PLL,
+       },
+       {
                .compatible = "renesas,rcar-gen2-usbhs",
                .data = (void *)USBHS_TYPE_RCAR_GEN2,
        },
@@ -519,7 +523,8 @@ static struct renesas_usbhs_platform_info *usbhs_parse_dt(struct device *dev)
                dparam->enable_gpio = gpio;
 
        if (dparam->type == USBHS_TYPE_RCAR_GEN2 ||
-           dparam->type == USBHS_TYPE_RCAR_GEN3) {
+           dparam->type == USBHS_TYPE_RCAR_GEN3 ||
+           dparam->type == USBHS_TYPE_RCAR_GEN3_WITH_PLL) {
                dparam->has_usb_dmac = 1;
                dparam->pipe_configs = usbhsc_new_pipe;
                dparam->pipe_size = ARRAY_SIZE(usbhsc_new_pipe);
@@ -584,6 +589,9 @@ static int usbhs_probe(struct platform_device *pdev)
        case USBHS_TYPE_RCAR_GEN3:
                priv->pfunc = usbhs_rcar3_ops;
                break;
+       case USBHS_TYPE_RCAR_GEN3_WITH_PLL:
+               priv->pfunc = usbhs_rcar3_with_pll_ops;
+               break;
        default:
                if (!info->platform_callback.get_id) {
                        dev_err(&pdev->dev, "no platform callbacks");

diff --git a/drivers/usb/renesas_usbhs/rcar3.c b/drivers/usb/renesas_usbhs/rcar3.c
index 02b67ab..f436e9d 100644 (file)
--- a/drivers/usb/renesas_usbhs/rcar3.c
+++ b/drivers/usb/renesas_usbhs/rcar3.c
@@ -15,24 +15,39 @@
 #include "rcar3.h"
 
 #define LPSTS          0x102
+#define UGCTRL         0x180   /* 32-bit register */
 #define UGCTRL2                0x184   /* 32-bit register */
+#define UGSTS          0x188   /* 32-bit register */
 
 /* Low Power Status register (LPSTS) */
 #define LPSTS_SUSPM    0x4000
 
+/* R-Car D3 only: USB General control register (UGCTRL) */
+#define UGCTRL_PLLRESET                0x00000001
+#define UGCTRL_CONNECT         0x00000004
+
 /*
  * USB General control register 2 (UGCTRL2)
  * Remarks: bit[31:11] and bit[9:6] should be 0
  */
 #define UGCTRL2_RESERVED_3     0x00000001      /* bit[3:0] should be B'0001 */
+#define UGCTRL2_USB0SEL_HSUSB  0x00000020
 #define UGCTRL2_USB0SEL_OTG    0x00000030
 #define UGCTRL2_VBUSSEL                0x00000400
 
+/* R-Car D3 only: USB General status register (UGSTS) */
+#define UGSTS_LOCK             0x00000100
+
 static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
 {
        iowrite32(data, priv->base + reg);
 }
 
+static u32 usbhs_read32(struct usbhs_priv *priv, u32 reg)
+{
+       return ioread32(priv->base + reg);
+}
+
 static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
                                void __iomem *base, int enable)
 {
@@ -52,6 +67,34 @@ static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
        return 0;
 }
 
+/* R-Car D3 needs to release UGCTRL.PLLRESET */
+static int usbhs_rcar3_power_and_pll_ctrl(struct platform_device *pdev,
+                                         void __iomem *base, int enable)
+{
+       struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+       u32 val;
+       int timeout = 1000;
+
+       if (enable) {
+               usbhs_write32(priv, UGCTRL, 0); /* release PLLRESET */
+               usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 |
+                             UGCTRL2_USB0SEL_HSUSB);
+
+               usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
+               do {
+                       val = usbhs_read32(priv, UGSTS);
+                       udelay(1);
+               } while (!(val & UGSTS_LOCK) && timeout--);
+               usbhs_write32(priv, UGCTRL, UGCTRL_CONNECT);
+       } else {
+               usbhs_write32(priv, UGCTRL, 0);
+               usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
+               usbhs_write32(priv, UGCTRL, UGCTRL_PLLRESET);
+       }
+
+       return 0;
+}
+
 static int usbhs_rcar3_get_id(struct platform_device *pdev)
 {
        return USBHS_GADGET;
@@ -61,3 +104,8 @@ const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
        .power_ctrl = usbhs_rcar3_power_ctrl,
        .get_id = usbhs_rcar3_get_id,
 };
+
+const struct renesas_usbhs_platform_callback usbhs_rcar3_with_pll_ops = {
+       .power_ctrl = usbhs_rcar3_power_and_pll_ctrl,
+       .get_id = usbhs_rcar3_get_id,
+};

diff --git a/drivers/usb/renesas_usbhs/rcar3.h b/drivers/usb/renesas_usbhs/rcar3.h
index 5f850b2..7fe9817 100644 (file)
--- a/drivers/usb/renesas_usbhs/rcar3.h
+++ b/drivers/usb/renesas_usbhs/rcar3.h
@@ -1,3 +1,4 @@
 #include "common.h"
 
 extern const struct renesas_usbhs_platform_callback usbhs_rcar3_ops;
+extern const struct renesas_usbhs_platform_callback usbhs_rcar3_with_pll_ops;

diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h
index 00a47d0..d2f41e4 100644 (file)
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -183,8 +183,9 @@ struct renesas_usbhs_driver_param {
 #define USBHS_USB_DMAC_XFER_SIZE       32      /* hardcode the xfer size */
 };
 
-#define USBHS_TYPE_RCAR_GEN2   1
-#define USBHS_TYPE_RCAR_GEN3   2
+#define USBHS_TYPE_RCAR_GEN2           1
+#define USBHS_TYPE_RCAR_GEN3           2
+#define USBHS_TYPE_RCAR_GEN3_WITH_PLL  3
 
 /*
  * option: