[PATCH v3 2/4] usb: chipidea: s32g: Add usb support for s32g2

[Dan Carpenter]

From: Ghennadi Procopciuc <ghennadi.procopciuc@xxxxxxx>

Enable USB driver for s32g2.  This chip has an errata ERR050474[1]
so we need to set S32G_UCMALLBE to avoid some memory corruption.  I
have include the description below:

ERR050474: USB : USB data may be corrupted if transaction size is
non-multiple of 32bits

Description
When USB issues narrow length transfers i.e. AHB transaction size is less
than 4bytes, data for that transaction will get corrupted. Narrow length
transactions can occur if the transaction size is non-multiple of four
bytes, error scenarios terminate the transactions early or if the address
offset programmed in QTD is 4 Byte unaligned.  This happens because the
SoC NOC is not able to handle the byte strobes generated by USB controller
and is dependent on its internally generates byte strobes.

Workaround
Narrow transfers work properly on bypassing USB controller’s byte
generation logic. This can be done by setting UCMALLBE (bit 15, USB Core
Master All Byte Enable) bit of UOTGNC_CR.

Link: https://www.nxp.com/webapp/Download?colCode=S32G2_1P77B
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@xxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
v3: Add the errata to the commit message

 drivers/usb/chipidea/ci_hdrc_imx.c |  6 +++
 drivers/usb/chipidea/usbmisc_imx.c | 73 ++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 780f4d151345..e8c847eab8e3 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2025 NXP
  * Copyright (C) 2012 Marek Vasut <marex@xxxxxxx>
  * on behalf of DENX Software Engineering GmbH
  */
@@ -78,6 +79,10 @@ static const struct ci_hdrc_imx_platform_flag imx8ulp_usb_data = {
 		CI_HDRC_HAS_PORTSC_PEC_MISSED,
 };
 
+static const struct ci_hdrc_imx_platform_flag s32g_usb_data = {
+	.flags = CI_HDRC_DISABLE_HOST_STREAMING,
+};
+
 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
 	{ .compatible = "fsl,imx23-usb", .data = &imx23_usb_data},
 	{ .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
@@ -89,6 +94,7 @@ static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
 	{ .compatible = "fsl,imx7d-usb", .data = &imx7d_usb_data},
 	{ .compatible = "fsl,imx7ulp-usb", .data = &imx7ulp_usb_data},
 	{ .compatible = "fsl,imx8ulp-usb", .data = &imx8ulp_usb_data},
+	{ .compatible = "nxp,s32g2-usb", .data = &s32g_usb_data},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 118b9a68496b..27a3127db4f6 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2025 NXP
  */
 
 #include <linux/module.h>
@@ -155,6 +156,18 @@
 					 BLKCTL_OTG_VBUS_WAKEUP_EN | \
 					 BLKCTL_OTG_DPDM_WAKEUP_EN)
 
+#define S32G_WAKEUP_IE		BIT(0)
+#define S32G_CORE_IE		BIT(1)
+#define S32G_PWRFLTEN		BIT(7)
+#define S32G_WAKEUPCTRL		BIT(10)
+#define S32G_WAKEUPEN		BIT(11)
+
+/* Workaround errata ERR050474 (handle packages that aren't 4 byte aligned) */
+#define S32G_UCMALLBE		BIT(15)
+
+#define S32G_WAKEUP_BITS (S32G_WAKEUP_IE | S32G_CORE_IE | S32G_WAKEUPEN | \
+			  S32G_WAKEUPCTRL)
+
 struct usbmisc_ops {
 	/* It's called once when probe a usb device */
 	int (*init)(struct imx_usbmisc_data *data);
@@ -614,6 +627,52 @@ static int usbmisc_vf610_init(struct imx_usbmisc_data *data)
 	return 0;
 }
 
+static int usbmisc_s32g_set_wakeup(struct imx_usbmisc_data *data, bool enabled)
+{
+	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&usbmisc->lock, flags);
+
+	reg = readl(usbmisc->base);
+	if (enabled)
+		reg |= S32G_WAKEUP_BITS;
+	else
+		reg &= ~S32G_WAKEUP_BITS;
+
+	writel(reg, usbmisc->base);
+	spin_unlock_irqrestore(&usbmisc->lock, flags);
+
+	return 0;
+}
+
+static int usbmisc_s32g_init(struct imx_usbmisc_data *data, u32 extra_flags)
+{
+	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&usbmisc->lock, flags);
+
+	reg = readl(usbmisc->base);
+
+	reg |= S32G_PWRFLTEN;
+	reg |= extra_flags;
+
+	writel(reg, usbmisc->base);
+
+	spin_unlock_irqrestore(&usbmisc->lock, flags);
+	usbmisc_s32g_set_wakeup(data, false);
+
+	return 0;
+}
+
+static int usbmisc_s32g2_init(struct imx_usbmisc_data *data)
+{
+	return usbmisc_s32g_init(data, S32G_UCMALLBE);
+}
+
 static int usbmisc_imx7d_set_wakeup
 	(struct imx_usbmisc_data *data, bool enabled)
 {
@@ -1032,6 +1091,10 @@ static int usbmisc_imx6sx_power_lost_check(struct imx_usbmisc_data *data)
 	else
 		return 0;
 }
+static int usbmisc_s32g_power_lost_check(struct imx_usbmisc_data *data)
+{
+	return 1;
+}
 
 static u32 usbmisc_blkctl_wakeup_setting(struct imx_usbmisc_data *data)
 {
@@ -1131,6 +1194,12 @@ static const struct usbmisc_ops imx95_usbmisc_ops = {
 	.vbus_comparator_on = usbmisc_imx7d_vbus_comparator_on,
 };
 
+static const struct usbmisc_ops s32g2_usbmisc_ops = {
+	.init = usbmisc_s32g2_init,
+	.set_wakeup = usbmisc_s32g_set_wakeup,
+	.power_lost_check = usbmisc_s32g_power_lost_check,
+};
+
 static inline bool is_imx53_usbmisc(struct imx_usbmisc_data *data)
 {
 	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
@@ -1356,6 +1425,10 @@ static const struct of_device_id usbmisc_imx_dt_ids[] = {
 		.compatible = "fsl,imx95-usbmisc",
 		.data = &imx95_usbmisc_ops,
 	},
+	{
+		.compatible = "nxp,s32g2-usbmisc",
+		.data = &s32g2_usbmisc_ops,
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
-- 
2.47.2