[PATCH v4 3/3] usb: gadget: rcar: Add support for RZ/G2L (R9A07G044)

[Michele Bisogno <micbis.openwrt@gmail.com>]

The Renesas RZ/G2L (and RZ/G2LC) USBHS controller requires the
CNEN bit in the SYSCFG register to be set for function operation.
Additionally, its CFIFO is byte-addressable.

Introduce a new renesas_usbhs_driver_param structure for the
RZ/G2L SoC and link it via the udevice_id data pointer. Update
usbhs_probe() to accept the udevice pointer to retrieve these
parameters during initialization.

This alignment follows the logic used in the Linux kernel
renesas_usbhs driver.

Signed-off-by: Michele Bisogno <micbis.openwrt@gmail.com>
---
 drivers/usb/gadget/rcar/common.c      | 20 ++++++++++++++++++++
 drivers/usb/gadget/rcar/renesas_usb.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/usb/gadget/rcar/common.c b/drivers/usb/gadget/rcar/common.c
index a5d56f8dbe4..051cab8a422 100644
--- a/drivers/usb/gadget/rcar/common.c
+++ b/drivers/usb/gadget/rcar/common.c
@@ -92,6 +92,12 @@ void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
 	u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
 	u16 val  = HSE | USBE;
 
+	/* CNEN bit is required for function operation */
+	if (usbhs_get_dparam(priv, has_cnen)) {
+		mask |= CNEN;
+		val  |= CNEN;
+	}
+
 	/*
 	 * if enable
 	 *
@@ -361,13 +367,21 @@ static int usbhs_udc_otg_gadget_handle_interrupts(struct udevice *dev)
 
 static int usbhs_probe(struct usbhs_priv *priv, struct udevice *dev)
 {
+	struct renesas_usbhs_driver_param *plat_param;
 	int ret;
 
+	plat_param = (struct renesas_usbhs_driver_param *)dev_get_driver_data(dev);
+
 	priv->dparam.type = USBHS_TYPE_RCAR_GEN3;
 	priv->dparam.pio_dma_border = 64;
 	priv->dparam.pipe_configs = usbhsc_new_pipe;
 	priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_new_pipe);
 
+	if (plat_param) {
+		priv->dparam.has_cnen		= plat_param->has_cnen;
+		priv->dparam.cfifo_byte_addr	= plat_param->cfifo_byte_addr;
+	}
+
 	/* call pipe and module init */
 	ret = usbhs_pipe_probe(priv);
 	if (ret < 0)
@@ -479,8 +493,14 @@ static int usbhs_udc_otg_remove(struct udevice *dev)
 	return dm_scan_fdt_dev(dev);
 }
 
+static struct renesas_usbhs_driver_param rzg2l_param = {
+	.has_cnen = 1,
+	.cfifo_byte_addr = 1,
+};
+
 static const struct udevice_id usbhs_udc_otg_ids[] = {
 	{ .compatible = "renesas,rcar-gen3-usbhs" },
+	{ .compatible = "renesas,rzg2l-usbhs", .data = (unsigned long)&rzg2l_param },
 	{},
 };
 
diff --git a/drivers/usb/gadget/rcar/renesas_usb.h b/drivers/usb/gadget/rcar/renesas_usb.h
index 8155e3dcaf6..140a70251cf 100644
--- a/drivers/usb/gadget/rcar/renesas_usb.h
+++ b/drivers/usb/gadget/rcar/renesas_usb.h
@@ -111,6 +111,7 @@ struct renesas_usbhs_driver_param {
 	u32 has_otg:1; /* for controlling PWEN/EXTLP */
 	u32 has_sudmac:1; /* for SUDMAC */
 	u32 has_usb_dmac:1; /* for USB-DMAC */
+	u32 has_cnen:1;
 	u32 cfifo_byte_addr:1; /* CFIFO is byte addressable */
 #define USBHS_USB_DMAC_XFER_SIZE	32	/* hardcode the xfer size */
 	u32 multi_clks:1;
-- 
2.34.1