linux-kernel - [PATCH] usb: chipidea: imx: Do not access CLKONOFF on i.MX51

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Date:   Mon,  8 May 2017 07:15:01 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Peter Chen <peter.chen@....com>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>, cphealy@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: chipidea: imx: Do not access CLKONOFF on i.MX51

Unlike i.MX53, i.MX51's USBOH3 register file does not implemenent
registers past offset 0x018, which includes
MX53_USB_CLKONOFF_CTRL_OFFSET and trying to access that register on
said platform results in external abort.

Fix it by enabling CLKONOFF accessing codepath only for i.MX53.

Fixes 3be3251db0887f721f9c110e1966900922fc4ff4
("usb: chipidea: imx: Disable internal 60Mhz clock with ULPI PHY")

Cc: cphealy@...il.com
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
---
 drivers/usb/chipidea/usbmisc_imx.c | 44 +++++++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index e77a4ed..fc21f92 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -195,7 +195,7 @@ static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
 	return 0;
 }
 
-static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
+static int usbmisc_imx5x_init(struct imx_usbmisc_data *data, bool has_clkonoff)
 {
 	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
 	void __iomem *reg = NULL;
@@ -242,10 +242,15 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
 				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
 			writel(val, reg);
-			/* Disable internal 60Mhz clock */
-			reg = usbmisc->base + MX53_USB_CLKONOFF_CTRL_OFFSET;
-			val = readl(reg) | MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF;
-			writel(val, reg);
+			if (has_clkonoff) {
+				/* Disable internal 60Mhz clock */
+				reg = usbmisc->base +
+					MX53_USB_CLKONOFF_CTRL_OFFSET;
+				val = readl(reg) |
+					MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF;
+				writel(val, reg);
+			}
+
 		}
 		if (data->disable_oc) {
 			reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
@@ -267,10 +272,15 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
 				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
 			writel(val, reg);
-			/* Disable internal 60Mhz clock */
-			reg = usbmisc->base + MX53_USB_CLKONOFF_CTRL_OFFSET;
-			val = readl(reg) | MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF;
-			writel(val, reg);
+
+			if (has_clkonoff) {
+				/* Disable internal 60Mhz clock */
+				reg = usbmisc->base +
+					MX53_USB_CLKONOFF_CTRL_OFFSET;
+				val = readl(reg) |
+					MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF;
+				writel(val, reg);
+			}
 		}
 		if (data->disable_oc) {
 			reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
@@ -285,6 +295,16 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 	return 0;
 }
 
+static int usbmisc_imx51_init(struct imx_usbmisc_data *data)
+{
+	return usbmisc_imx5x_init(data, false);
+}
+
+static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
+{
+	return usbmisc_imx5x_init(data, true);
+}
+
 static int usbmisc_imx6q_set_wakeup
 	(struct imx_usbmisc_data *data, bool enabled)
 {
@@ -456,6 +476,10 @@ static const struct usbmisc_ops imx27_usbmisc_ops = {
 	.init = usbmisc_imx27_init,
 };
 
+static const struct usbmisc_ops imx51_usbmisc_ops = {
+	.init = usbmisc_imx51_init,
+};
+
 static const struct usbmisc_ops imx53_usbmisc_ops = {
 	.init = usbmisc_imx53_init,
 };
@@ -536,7 +560,7 @@ static const struct of_device_id usbmisc_imx_dt_ids[] = {
 	},
 	{
 		.compatible = "fsl,imx51-usbmisc",
-		.data = &imx53_usbmisc_ops,
+		.data = &imx51_usbmisc_ops,
 	},
 	{
 		.compatible = "fsl,imx53-usbmisc",
-- 
2.9.3