[PATCH RFC v5 6/6] usb: dwc3: dwc3-exynos: add host init

[Daehwan Jung]

This is for xHCI Host Controller driver on Exynos SOC.
It registers vendor ops before loading xhci platform driver.

Signed-off-by: Daehwan Jung <dh10.jung@xxxxxxxxxxx>
---
 drivers/usb/dwc3/dwc3-exynos.c | 100 ++++++++++++++++++++++++++++++++-
 1 file changed, 99 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index 0ecf20eeceee..c22ea5cd6ab0 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -17,6 +17,12 @@
 #include <linux/of_platform.h>
 #include <linux/regulator/consumer.h>
 
+#include "core.h"
+
+#if IS_ENABLED(CONFIG_USB_XHCI_EXYNOS)
+int xhci_exynos_register_vendor_ops(void);
+#endif
+
 #define DWC3_EXYNOS_MAX_CLOCKS	4
 
 struct dwc3_exynos_driverdata {
@@ -27,6 +33,7 @@ struct dwc3_exynos_driverdata {
 
 struct dwc3_exynos {
 	struct device		*dev;
+	struct dwc3		*dwc;
 
 	const char		**clk_names;
 	struct clk		*clks[DWC3_EXYNOS_MAX_CLOCKS];
@@ -46,12 +53,81 @@ static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_USB_XHCI_EXYNOS)
+static int dwc3_exynos_host_init(struct dwc3_exynos *exynos)
+{
+	struct dwc3		*dwc = exynos->dwc;
+	struct device		*dev = exynos->dev;
+	struct platform_device	*xhci;
+	struct resource		*res;
+	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
+	int			ret = 0;
+
+	/* Configuration xhci resources */
+	xhci_exynos_register_vendor_ops();
+
+	res = platform_get_resource(dwc3_pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "missing memory resource\n");
+		return -ENODEV;
+	}
+	dwc->xhci_resources[0].start = res->start;
+	dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
+					DWC3_XHCI_REGS_END;
+	dwc->xhci_resources[0].flags = res->flags;
+	dwc->xhci_resources[0].name = res->name;
+
+	res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
+	if (!res) {
+		dev_err(dev, "missing irq resource\n");
+		return -ENODEV;
+	}
+
+	dwc->xhci_resources[1].start = dwc->irq_gadget;
+	dwc->xhci_resources[1].end = dwc->irq_gadget;
+	dwc->xhci_resources[1].flags = res->flags;
+	dwc->xhci_resources[1].name = res->name;
+
+	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
+	if (!xhci) {
+		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
+		return -ENOMEM;
+	}
+
+	xhci->dev.parent	= dwc->dev;
+	ret = dma_set_mask_and_coherent(&xhci->dev, DMA_BIT_MASK(36));
+	if (ret) {
+		pr_err("xhci dma set mask ret = %d\n", ret);
+		return ret;
+	}
+
+	ret = platform_device_add_resources(xhci, dwc->xhci_resources,
+						DWC3_XHCI_RESOURCES_NUM);
+	if (ret) {
+		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
+		goto err;
+	}
+
+	ret = platform_device_add(xhci);
+	if (ret) {
+		dev_err(dwc->dev, "couldn't add xHCI device\n");
+		goto err;
+	}
+
+	return 0;
+err:
+	platform_device_put(xhci);
+	return ret;
+}
+#endif
+
 static int dwc3_exynos_probe(struct platform_device *pdev)
 {
 	struct dwc3_exynos	*exynos;
 	struct device		*dev = &pdev->dev;
-	struct device_node	*node = dev->of_node;
+	struct device_node	*node = dev->of_node, *dwc3_np;
 	const struct dwc3_exynos_driverdata *driver_data;
+	struct platform_device *dwc3_pdev;
 	int			i, ret;
 
 	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
@@ -109,6 +185,12 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 		goto vdd10_err;
 	}
 
+	dwc3_np = of_get_compatible_child(node, "snps,dwc3");
+	if (!dwc3_np) {
+		dev_err(dev, "failed to find dwc3 core child!\n");
+		goto vdd33_err;
+	}
+
 	if (node) {
 		ret = of_platform_populate(node, NULL, NULL, dev);
 		if (ret) {
@@ -121,6 +203,22 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 		goto populate_err;
 	}
 
+	dwc3_pdev = of_find_device_by_node(dwc3_np);
+	exynos->dwc = platform_get_drvdata(dwc3_pdev);
+	if (!exynos->dwc) {
+		ret = -EPROBE_DEFER;
+		dev_err(dev, "failed to get dwc3 core node!\n");
+		goto populate_err;
+	}
+
+#if IS_ENABLED(CONFIG_USB_XHCI_EXYNOS)
+	/* USB host initialization. */
+	ret = dwc3_exynos_host_init(exynos);
+	if (ret) {
+		dev_err(dev, "USB host pre-initialization fail!\n");
+		goto populate_err;
+	}
+#endif
 	return 0;
 
 populate_err:
-- 
2.31.1