[PATCH v4][ 3/8] usb: chipidea: usbmisc: Add USB support for i.MX25/i.MX35 CPUs

[denis@eukrea.com (Denis Carikli)]

This adds the i.MX25 and the i.MX35 support in the
ChipIdea usbmisc driver.

The i.MX25 and i.MX35 usb controllers are similar enough to be
able to use the same code.

Signed-off-by: Denis Carikli <denis@eukrea.com>
---
Changelog v3->v4:
- The MXC_EHCI_INTERFACE_* were renamed in MX25_EHCI_INTERFACE_*
- Since the peripheral mode also works with USB OTG,
  the commit summary was updated to reflect that.

Changelog v2->v3:
- Add a commit log

Changelog v1->v2:
- converted two remaining defines to BIT()
- Removed a variable declaration that was not used in usbmisc_imx25_init
---
 drivers/usb/chipidea/usbmisc_imx.c |   58 ++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index cd061ab..419b895 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -21,6 +21,26 @@
 #define MX25_USB_PHY_CTRL_OFFSET	0x08
 #define MX25_BM_EXTERNAL_VBUS_DIVIDER	BIT(23)
 
+#define MX25_EHCI_INTERFACE_SINGLE_UNI	(2 << 0)
+#define MX25_EHCI_INTERFACE_DIFF_UNI	(0 << 0)
+#define MX25_EHCI_INTERFACE_MASK	(0xf)
+
+#define MX25_OTG_SIC_SHIFT		29
+#define MX25_OTG_SIC_MASK		(0x3 << MX25_OTG_SIC_SHIFT)
+#define MX25_OTG_PM_BIT			BIT(24)
+#define MX25_OTG_PP_BIT			BIT(11)
+#define MX25_OTG_OCPOL_BIT		BIT(3)
+
+#define MX25_H1_SIC_SHIFT		21
+#define MX25_H1_SIC_MASK		(0x3 << MX25_H1_SIC_SHIFT)
+#define MX25_H1_PP_BIT			BIT(18)
+#define MX25_H1_PM_BIT			BIT(16)
+#define MX25_H1_IPPUE_UP_BIT		BIT(7)
+#define MX25_H1_IPPUE_DOWN_BIT		BIT(6)
+#define MX25_H1_TLL_BIT			BIT(5)
+#define MX25_H1_USBTE_BIT		BIT(4)
+#define MX25_H1_OCPOL_BIT		BIT(2)
+
 #define MX27_H1_PM_BIT			BIT(8)
 #define MX27_H2_PM_BIT			BIT(16)
 #define MX27_OTG_PM_BIT			BIT(24)
@@ -50,6 +70,39 @@ struct imx_usbmisc {
 
 static struct imx_usbmisc *usbmisc;
 
+static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
+{
+	unsigned long flags;
+	u32 val = 0;
+
+	if (data->index > 1)
+		return -EINVAL;
+
+	spin_lock_irqsave(&usbmisc->lock, flags);
+	switch (data->index) {
+	case 0:
+		val = readl(usbmisc->base);
+		val &= ~(MX25_OTG_SIC_MASK | MX25_OTG_PP_BIT);
+		val |= (MX25_EHCI_INTERFACE_DIFF_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_OTG_SIC_SHIFT;
+		val |= (MX25_OTG_PM_BIT | MX25_OTG_OCPOL_BIT);
+		writel(val, usbmisc->base);
+		break;
+	case 1:
+		val = readl(usbmisc->base);
+		val &= ~(MX25_H1_SIC_MASK | MX25_H1_PP_BIT |  MX25_H1_IPPUE_UP_BIT);
+		val |= (MX25_EHCI_INTERFACE_SINGLE_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_H1_SIC_SHIFT;
+		val |= (MX25_H1_PM_BIT | MX25_H1_OCPOL_BIT | MX25_H1_TLL_BIT |
+			MX25_H1_USBTE_BIT | MX25_H1_IPPUE_DOWN_BIT);
+
+		writel(val, usbmisc->base);
+
+		break;
+	}
+	spin_unlock_irqrestore(&usbmisc->lock, flags);
+
+	return 0;
+}
+
 static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
 {
 	void __iomem *reg;
@@ -159,6 +212,7 @@ static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
 }
 
 static const struct usbmisc_ops imx25_usbmisc_ops = {
+	.init = usbmisc_imx25_init,
 	.post = usbmisc_imx25_post,
 };
 
@@ -200,6 +254,10 @@ static const struct of_device_id usbmisc_imx_dt_ids[] = {
 		.data = &imx25_usbmisc_ops,
 	},
 	{
+		.compatible = "fsl,imx35-usbmisc",
+		.data = &imx25_usbmisc_ops,
+	},
+	{
 		.compatible = "fsl,imx27-usbmisc",
 		.data = &imx27_usbmisc_ops,
 	},
-- 
1.7.9.5