[PATCH v5 0/3] usb: ChipIdea: add Nuvoton NPCM UDC support

[PATCH v5 0/3] usb: ChipIdea: add Nuvoton NPCM UDC support

[Tomer Maimon]

This patch set add USB device controller for the NPCM Baseboard
Management Controllers (BMC).

NPCM UDC driver is a part of the USB ChipIdea driver.

Adding CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag to modify the vbus_active
parameter to active in case the ChipIdea USB IP role is device-only and
there is no otgsc register.

BMC NPCM7XX and BMC NPCM8XX has ten identical NPCM UDC modules,

The NPCM UDC were tested on NPCM845 evaluation board.

Addressed comments from:
 - Krzysztof Kozlowski : https://www.spinics.net/lists/devicetree/msg638451.html

Changes since version 4:
 - Modify npcm845-udc compatible.

Changes since version 3:
 - Add Acked-by Peter Chen.
 
Changes since version 2:
 - Use dev_err_probe.
 - Remove MODULE_ALIAS.

Changes since version 1:
 - Add SoC specific compatible.
 - Remove USB phy mux property from dt-binding, will be handled differently.
 - Add CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS commit to this patch set.

Tomer Maimon (3):
  usb: chipidea: add CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag
  dt-bindings: usb: ci-hdrc-usb2: add npcm750 and npcm845 compatible
  usb: chipidea: Add support for NPCM

 .../devicetree/bindings/usb/ci-hdrc-usb2.yaml |   7 ++
 drivers/usb/chipidea/Kconfig                  |   4 +
 drivers/usb/chipidea/Makefile                 |   1 +
 drivers/usb/chipidea/ci_hdrc_npcm.c           | 114 ++++++++++++++++++
 drivers/usb/chipidea/otg.c                    |   5 +-
 include/linux/usb/chipidea.h                  |   1 +
 6 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 drivers/usb/chipidea/ci_hdrc_npcm.c

-- 
2.33.0

[PATCH v5 1/3] usb: chipidea: add CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag

[Tomer Maimon]

Adding CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag to modify the vbus_active
parameter to active in case the ChipIdea USB IP role is device-only and
there is no otgsc register.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
---
 drivers/usb/chipidea/otg.c   | 5 ++++-
 include/linux/usb/chipidea.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index f5490f2a5b6b..647e98f4e351 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -130,8 +130,11 @@ enum ci_role ci_otg_role(struct ci_hdrc *ci)
 
 void ci_handle_vbus_change(struct ci_hdrc *ci)
 {
-	if (!ci->is_otg)
+	if (!ci->is_otg) {
+		if (ci->platdata->flags & CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS)
+			usb_gadget_vbus_connect(&ci->gadget);
 		return;
+	}
 
 	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active)
 		usb_gadget_vbus_connect(&ci->gadget);
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 0b4f2d5faa08..5a7f96684ea2 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -64,6 +64,7 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_PMQOS			BIT(15)
 #define CI_HDRC_PHY_VBUS_CONTROL	BIT(16)
 #define CI_HDRC_HAS_PORTSC_PEC_MISSED	BIT(17)
+#define CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS	BIT(18)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
-- 
2.33.0

[PATCH v5 2/3] dt-bindings: usb: ci-hdrc-usb2: add npcm750 and npcm845 compatible

[Tomer Maimon]

Add a compatible string for Nuvoton BMC NPCM750 and Nuvoton BMC NPCM845.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml
index 1394557517b1..57780f8340ea 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml
@@ -16,6 +16,7 @@ properties:
       - enum:
           - chipidea,usb2
           - lsi,zevio-usb
+          - nuvoton,npcm750-udc
           - nvidia,tegra20-ehci
           - nvidia,tegra20-udc
           - nvidia,tegra30-ehci
@@ -66,6 +67,10 @@ properties:
       - items:
           - const: xlnx,zynq-usb-2.20a
           - const: chipidea,usb2
+      - items:
+          - enum:
+              - nuvoton,npcm845-udc
+          - const: nuvoton,npcm750-udc
 
   reg:
     minItems: 1
@@ -388,6 +393,8 @@ allOf:
             enum:
               - chipidea,usb2
               - lsi,zevio-usb
+              - nuvoton,npcm750-udc
+              - nuvoton,npcm845-udc
               - nvidia,tegra20-udc
               - nvidia,tegra30-udc
               - nvidia,tegra114-udc
-- 
2.33.0

Re: [PATCH v5 2/3] dt-bindings: usb: ci-hdrc-usb2: add npcm750 and npcm845 compatible

[Krzysztof Kozlowski]

On 05/10/2023 21:25, Tomer Maimon wrote:
> Add a compatible string for Nuvoton BMC NPCM750 and Nuvoton BMC NPCM845.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
> ---

>    reg:
>      minItems: 1
> @@ -388,6 +393,8 @@ allOf:
>              enum:
>                - chipidea,usb2
>                - lsi,zevio-usb
> +              - nuvoton,npcm750-udc
> +              - nuvoton,npcm845-udc

npcm845 is not needed here.

Best regards,
Krzysztof

[PATCH v5 3/3] usb: chipidea: Add support for NPCM

[Tomer Maimon]

Add Nuvoton NPCM BMC SoCs support to USB ChipIdea driver.
NPCM SoC include ChipIdea IP block that used for USB device controller
mode.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
---
 drivers/usb/chipidea/Kconfig        |   4 +
 drivers/usb/chipidea/Makefile       |   1 +
 drivers/usb/chipidea/ci_hdrc_npcm.c | 114 ++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 drivers/usb/chipidea/ci_hdrc_npcm.c

diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index c815824a0b2d..bab45bc62361 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig
@@ -43,6 +43,10 @@ config USB_CHIPIDEA_MSM
 	tristate "Enable MSM hsusb glue driver" if EXPERT
 	default USB_CHIPIDEA
 
+config USB_CHIPIDEA_NPCM
+	tristate "Enable NPCM hsusb glue driver" if EXPERT
+	default USB_CHIPIDEA
+
 config USB_CHIPIDEA_IMX
 	tristate "Enable i.MX USB glue driver" if EXPERT
 	depends on OF
diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 71afeab97e83..718cb24603dd 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -13,6 +13,7 @@ ci_hdrc-$(CONFIG_USB_OTG_FSM)		+= otg_fsm.o
 
 obj-$(CONFIG_USB_CHIPIDEA_GENERIC)	+= ci_hdrc_usb2.o
 obj-$(CONFIG_USB_CHIPIDEA_MSM)		+= ci_hdrc_msm.o
+obj-$(CONFIG_USB_CHIPIDEA_NPCM)		+= ci_hdrc_npcm.o
 obj-$(CONFIG_USB_CHIPIDEA_PCI)		+= ci_hdrc_pci.o
 obj-$(CONFIG_USB_CHIPIDEA_IMX)		+= usbmisc_imx.o ci_hdrc_imx.o
 obj-$(CONFIG_USB_CHIPIDEA_TEGRA)	+= ci_hdrc_tegra.o
diff --git a/drivers/usb/chipidea/ci_hdrc_npcm.c b/drivers/usb/chipidea/ci_hdrc_npcm.c
new file mode 100644
index 000000000000..37b64a3dbd96
--- /dev/null
+++ b/drivers/usb/chipidea/ci_hdrc_npcm.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2023 Nuvoton Technology corporation.
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/usb/chipidea.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/reset-controller.h>
+#include <linux/of.h>
+
+#include "ci.h"
+
+struct npcm_udc_data {
+	struct platform_device	*ci;
+	struct clk		*core_clk;
+	struct ci_hdrc_platform_data pdata;
+};
+
+static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned event)
+{
+	struct device *dev = ci->dev->parent;
+
+	switch (event) {
+	case CI_HDRC_CONTROLLER_RESET_EVENT:
+		/* clear all mode bits */
+		hw_write(ci, OP_USBMODE, 0xffffffff, 0x0);
+		break;
+	default:
+		dev_dbg(dev, "unknown ci_hdrc event\n");
+		break;
+	}
+
+	return 0;
+}
+
+static int npcm_udc_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct npcm_udc_data *ci;
+	struct platform_device *plat_ci;
+	struct device *dev = &pdev->dev;
+
+	ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
+	if (!ci)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, ci);
+
+	ci->core_clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(ci->core_clk))
+		return PTR_ERR(ci->core_clk);
+
+	ret = clk_prepare_enable(ci->core_clk);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable the clock: %d\n", ret);
+
+	ci->pdata.name = dev_name(dev);
+	ci->pdata.capoffset = DEF_CAPOFFSET;
+	ci->pdata.flags	= CI_HDRC_REQUIRES_ALIGNED_DMA |
+		CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS;
+	ci->pdata.phy_mode = USBPHY_INTERFACE_MODE_UTMI;
+	ci->pdata.notify_event = npcm_udc_notify_event;
+
+	plat_ci = ci_hdrc_add_device(dev, pdev->resource, pdev->num_resources,
+				     &ci->pdata);
+	if (IS_ERR(plat_ci)) {
+		ret = PTR_ERR(plat_ci);
+		dev_err(dev, "failed to register HDRC NPCM device: %d\n", ret);
+		goto clk_err;
+	}
+
+	pm_runtime_no_callbacks(dev);
+	pm_runtime_enable(dev);
+
+	return 0;
+
+clk_err:
+	clk_disable_unprepare(ci->core_clk);
+	return ret;
+}
+
+static int npcm_udc_remove(struct platform_device *pdev)
+{
+	struct npcm_udc_data *ci = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+	ci_hdrc_remove_device(ci->ci);
+	clk_disable_unprepare(ci->core_clk);
+
+	return 0;
+}
+
+static const struct of_device_id npcm_udc_dt_match[] = {
+	{ .compatible = "nuvoton,npcm750-udc", },
+	{ .compatible = "nuvoton,npcm845-udc", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);
+
+static struct platform_driver npcm_udc_driver = {
+	.probe = npcm_udc_probe,
+	.remove = npcm_udc_remove,
+	.driver = {
+		.name = "npcm_udc",
+		.of_match_table = npcm_udc_dt_match,
+	},
+};
+
+module_platform_driver(npcm_udc_driver);
+
+MODULE_DESCRIPTION("NPCM USB device controller driver");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.33.0